JP6607029B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  Conventionally, a permanent magnet motor such as a brushless motor includes, for example, a stator in which a winding is wound around a stator core and a rotor having a permanent magnet facing the stator as a magnetic pole, as shown in Patent Document 1, for example. The rotor rotates by receiving a rotating magnetic field generated by supplying a drive current to the winding of the stator.

JP 2014-135852 A

  In the permanent magnet motor as described above, the higher the rotor is driven, the greater the induced voltage generated in the stator winding due to the increase of the linkage flux by the permanent magnet of the rotor, and this induced voltage decreases the motor output. This hinders high motor rotation. Therefore, by reducing the magnetic force of the rotor magnetic poles, for example, by reducing the size of the permanent magnets of the rotor, it is possible to suppress the induced voltage when the rotor rotates at a high speed. Therefore, there is still room for improvement in this respect.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor capable of achieving high rotation speed while suppressing a decrease in torque.

A motor that solves the above problem is a motor in which a rotor rotates in response to a rotating magnetic field generated by supplying a drive current to a winding of a stator, and the windings are rotated at the same timing by the drive current. The rotor includes a first winding and a second winding that are excited and connected in series. The rotor magnetic pole of the rotor includes a magnet magnetic pole using a permanent magnet and a core magnetic pole using a part of the rotor core. The core magnetic pole is opposed to the second winding at the rotational position of the rotor where the magnet magnetic pole is opposed to the first winding, and the first winding having the same excitation timing and the Rather than weakening the magnetic force of all the rotor magnetic poles facing the second winding, the magnetic force to the stator side is weakened with some of the magnetic poles as the core magnetic poles .

  According to this configuration, the rotor magnetic pole that faces the first and second windings having the same excitation timing at a predetermined rotational position includes the magnet magnetic pole using a permanent magnet and the core using a part of the rotor core. The structure includes a magnetic pole. That is, rather than weakening the magnetic force of all the rotor magnetic poles facing the first and second windings having the same excitation timing, the magnetic force to the stator side is weakened by using some of the magnetic poles as core magnetic poles. Thus, a combined induced voltage obtained by synthesizing the induced voltage generated in the first winding by the magnetic force of the magnet magnetic pole and the induced voltage generated in the second winding by the magnetic force of the core magnetic pole while suppressing the torque reduction as much as possible. As a result, the motor can be rotated at a high speed.

  In the winding mode in which the first and second windings excited at the same timing are connected in series, the sum of the induced voltages generated in the first and second windings becomes the combined induced voltage. The synthetic induced voltage tends to increase. For this reason, in the configuration in which the first and second windings are connected in series, the magnetic pole configuration of the rotor described above makes it possible to obtain a remarkable effect of suppressing the combined induction voltage, and to increase the rotation of the motor. More suitable.

  In the motor, the windings are each composed of 2n (n is an integer of 2 or more) U-phase windings, V-phase windings, and W-phase windings according to the supplied three-phase driving current. It is preferable that the number of each of the magnet magnetic pole and the core magnetic pole is n.

  According to this configuration, the number of windings of each phase of the stator is configured by an even number of 4 or more, and the magnet magnetic pole and the core magnetic pole of the rotor are configured by the same number of 2 or more (half the number of windings of each phase). For this reason, it becomes possible to make the rotor have an excellent balance magnetically and mechanically.

In the motor, it is preferable that the magnet magnetic poles and the core magnetic poles are alternately provided at equal intervals in the circumferential direction.
According to this configuration, since the magnet magnetic poles and core magnetic poles of the rotor facing the same-phase windings (windings of the same excitation timing) of the stator are alternately provided at equal intervals in the circumferential direction, the rotor is magnetically and mechanically Therefore, a configuration with an excellent balance can be obtained.

In the motor, the core magnetic pole is preferably configured to be adjacent in the circumferential direction to a magnet pole having a different polarity using a permanent magnet.
According to this configuration, the core magnetic pole is configured to be adjacent to the magnet pole of a different polarity using a permanent magnet in the circumferential direction. For this reason, for example, the core magnetic pole can be suitably functioned as the N pole by the magnetic field of the magnetic pole of the S pole.

In the motor, it is preferable that a gap is provided between the core magnetic pole and the magnet pole having the different polarity.
According to this configuration, since a gap is provided between the adjacent core magnetic pole and the different magnetic pole, it is possible to suppress a steep change in magnetic flux density at the boundary between the core magnetic pole and the different magnetic pole. As a result, it can contribute to reduction of torque pulsation.

  In the motor, the magnet magnetic pole and the core magnetic pole are provided in both the N pole and the S pole of the rotor, and the core magnetic pole of the N pole and the core magnetic pole of the S pole are adjacent to each other in the circumferential direction through a gap. It is preferable that it is comprised so that it may fit.

  According to this configuration, since a gap is provided between the N-pole core magnetic pole and the S-pole core magnetic pole adjacent to each other, it is easy to adjust the magnetic flux amount of the core magnetic pole of each pole to a desired value. It becomes possible to easily adjust the output characteristics of the motor.

In the motor, it is preferable that the rotor core is provided with a magnetic adjustment unit for inducing a magnetic flux flowing in the rotor core.
According to this configuration, the magnetic flux amount of the core magnetic pole can be easily adjusted to a desired value, and as a result, the output characteristics of the motor can be easily adjusted.

In the motor, it is preferable that the magnetic adjustment unit includes an auxiliary magnet that is embedded in the rotor core and flows a magnetic flux to the core magnetic pole.
According to this configuration, since not only the magnetic flux of the permanent magnet but also the magnetic flux of the auxiliary magnet flows in the core magnetic pole, the magnetic flux flowing in the core magnetic pole increases, and as a result, it is possible to contribute to higher torque of the motor.

  In the motor, the core magnetic pole is configured to be adjacent to a magnet pole of a different polarity using a permanent magnet in the circumferential direction, and the magnetic adjustment unit is configured to change the magnetic flux of the magnet magnetic pole to the circumferential direction of the adjacent core magnetic pole. It is preferable to provide a magnetic flux guiding portion that leads to the center side.

  According to this configuration, the magnetic flux from the magnet magnetic pole (permanent magnet) toward the adjacent core magnetic pole through the rotor core is guided to the center side in the circumferential direction of the core magnetic pole by the magnetic flux guiding section. Thus, the circumferential magnetic pole center (magnetic flux density peak position) in the core magnetic pole can be brought closer to the circumferential central position of the core magnetic pole, which is a more preferable configuration.

  In the motor, the magnet magnetic pole and the core magnetic pole are provided in both the N pole and the S pole of the rotor, and the N magnetic pole and the S magnetic pole are adjacent to each other in the circumferential direction. The core pole of S pole is provided on the opposite side of the magnet pole of S pole to the magnet pole of S pole, and the pole of N pole is provided on the opposite side of the magnet pole of S pole to the magnet pole of N pole. Preferably, the core magnetic pole is provided, and the magnetic adjustment unit is configured to suppress a short circuit of magnetic flux between the N-pole magnetic pole and the S-pole magnetic pole adjacent in the circumferential direction.

  According to this configuration, since the magnetic adjustment unit suppresses short-circuiting of the magnetic flux between the N pole magnet magnetic pole and the S pole magnet magnetic pole adjacent in the circumferential direction, the amount of magnetic flux from the magnet magnetic pole toward the adjacent core magnetic pole As a result, it is possible to contribute to higher torque of the motor.

In the motor, the magnet magnetic pole is preferably formed by fixing the permanent magnet to an outer peripheral surface of the rotor core.
According to this configuration, since the rotor has a surface magnet type structure (SPM structure), it can contribute to high torque of the motor.

In the motor, it is preferable that the magnet magnetic pole has the permanent magnet embedded in the rotor core.
According to this configuration, since the rotor has an embedded magnet type structure (IPM structure), it is advantageous in that demagnetization of the permanent magnet during field-weakening control is suppressed.

In the motor described above, it is preferable that a pair of the permanent magnets is provided on each of the N-pole and S-pole magnet magnetic poles so as to form a substantially V-shape extending radially outward as viewed in the axial direction.
According to this configuration, since the pair of permanent magnets is embedded in the N-pole and S-pole magnet magnetic poles so as to form a substantially V shape extending radially outward as viewed in the axial direction, It is possible to increase the rotor core volume. As a result, the reluctance torque can be increased, which can contribute to a higher torque of the motor.

In the motor, it is preferable that the magnetic adjustment unit is provided on a radially inner side than the permanent magnet in each of the N-pole and S-pole magnet magnetic poles.
According to this configuration, in the magnet magnetic pole in which the permanent magnet is arranged in a V shape, the magnetic adjustment unit for suppressing the short circuit of the magnetic flux between the magnet poles of different polarities is provided on the radially inner side than the permanent magnet. A short circuit of magnetic flux between magnet poles of different polarities can be suitably suppressed by the magnetic adjustment unit.

  In the motor, the rotor core has a plurality of magnet accommodation holes that accommodate the permanent magnets, and is disposed between a radial end of the magnet accommodation hole and the permanent magnet accommodated in the magnet accommodation hole. It is preferable that a void is provided.

  According to this configuration, since a gap is provided between the radial end of the magnet accommodation hole and the permanent magnet accommodated in the magnet accommodation hole, a short circuit of the magnetic flux in each permanent magnet due to the magnetic resistance of the gap. Can be suppressed.

The motor is preferably configured to be able to execute field weakening control.
According to this configuration, it is possible to suppress the field-weakening current supplied to the winding to be small by suppressing the induced voltage generated in the winding as described above. Since the field weakening current can be reduced, the permanent magnet is difficult to demagnetize during field weakening control, and the copper loss of the winding can be suppressed. In other words, since the amount of flux linkage that can be reduced with the same amount of field-weakening current increases, higher rotation by field-weakening control can be obtained more effectively.

  According to the motor of the present invention, high rotation can be achieved while suppressing a decrease in torque.

(A) is a top view of the motor of embodiment, (b) is a top view of the rotor of the same form. It is an electric circuit diagram which shows the connection aspect of the coil | winding in the form. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is an electric circuit diagram which shows the connection aspect of the coil | winding in another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the motor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example. It is a top view of the rotor of another example.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1A, the motor 10 of the present embodiment is configured as a brushless motor, and is configured by arranging a rotor 21 inside an annular stator 11.

[Structure of stator]
The stator 11 includes a stator core 12 and a winding 13 wound around the stator core 12. The stator core 12 is formed of a magnetic metal in a substantially annular shape, and has twelve teeth 12a extending radially inward at equal angular intervals in the circumferential direction.

  Twelve windings 13 are provided in the same number as the teeth 12a, and are wound around the teeth 12a in the same direction by concentrated winding. That is, twelve windings 13 are provided at equal intervals in the circumferential direction (30 ° intervals). The windings 13 are classified into three phases according to the three-phase driving currents (U phase, V phase, W phase) supplied, and U1, V1, Let W1, U2, V2, W2, U3, V3, W3, U4, V4, and W4.

  When viewed in each phase, the U-phase windings U1 to U4 are arranged at equal intervals in the circumferential direction (90 ° intervals). Similarly, the V-phase windings V1 to V4 are arranged at equal intervals in the circumferential direction (90 ° intervals). Similarly, the W-phase windings W1 to W4 are arranged at equal intervals in the circumferential direction (90 ° intervals).

  Moreover, as shown in FIG. 2, the winding 13 is connected in series for each phase. That is, the U-phase windings U1 to U4, the V-phase windings V1 to V4, and the W-phase windings W1 to W4 each constitute a series circuit. In this embodiment, a series circuit of U-phase windings U1 to U4, a series circuit of V-phase windings V1 to V4, and a series circuit of W-phase windings W1 to W4 are star-connected.

[Configuration of rotor]
As shown in FIG. 1B, the rotor 21 includes a rotor core 22 and a permanent magnet 23. The rotor core 22 is formed of a magnetic metal in a substantially disk shape, and a rotating shaft 24 is fixed at the center. Two magnet fixing portions 25 and four protrusions 26 are formed on the outer peripheral portion of the rotor core 22.

  Each magnet fixing portion 25 is provided at a 180 ° facing position in the circumferential direction. Two permanent magnets 23 are fixed to each of the magnet fixing portions 25, and a total of four permanent magnets 23 are provided on the outer peripheral portion of the rotor core 22.

  Each permanent magnet 23 has the same shape, and the outer peripheral surface of each permanent magnet 23 has an arc shape with the axis L as the center when viewed from the direction of the axis L of the rotating shaft 24. Further, the opening angle (circumferential width) around the axis L of each permanent magnet 23 is 45 °. The permanent magnet 23 is, for example, an anisotropic sintered magnet, and is composed of, for example, a neodymium magnet, a samarium cobalt (SmCo) magnet, an SmFeN-based magnet, a ferrite magnet, an alnico magnet, or the like.

  Each permanent magnet 23 is formed so that the magnetic orientation is directed in the radial direction, and the two permanent magnets 23 provided in each magnet fixing portion 25 are configured such that the magnetic poles appearing on the outer peripheral side are different from each other. Yes. Further, the permanent magnets 23 having the same polarity are arranged at 180 ° facing positions in the circumferential direction. Each of these permanent magnets 23 constitutes a part of the magnetic pole of the rotor 21. Specifically, the permanent magnet 23 in which the N pole appears on the outer peripheral side constitutes the N magnetic pole Mn, and the permanent magnet 23 in which the S pole appears on the outer peripheral constitutes the S magnetic pole Ms.

  Two protrusions 26 of the rotor core 22 are provided adjacent to each other in the circumferential direction between the circumferential directions of the magnet fixing portions 25. A gap K <b> 1 is formed between the pair of adjacent protrusions 26 in the circumferential direction. In addition, one of the pair of adjacent protrusions 26 is adjacent to the N-pole magnet magnetic pole Mn (the N-pole permanent magnet 23 on the outer peripheral side) in the circumferential direction, and the S pole is generated by the magnetic field of the N-pole permanent magnet 23. Function as a magnetic pole (saliency magnetic pole Ps). Similarly, the other protrusion 26 is adjacent to the S-pole magnet magnetic pole Ms (the outer peripheral side is the S-pole permanent magnet 23), and the N-pole magnetic pole (the salient-pole magnetic pole Pn) is generated by the magnetic field of the S-pole permanent magnet 23. Function as. The pair of N-pole salient poles Pn are arranged at 180 ° facing positions in the circumferential direction, and the pair of S-pole salient poles Ps are similarly arranged at 180 ° facing positions in the circumferential direction. In addition, the outer peripheral surface of each protrusion 26 is formed in an arc shape that is located on the same circle as the outer peripheral surface of each permanent magnet 23 as viewed from the axial direction (on the same circle with the axis L of the rotating shaft 24 as the center). ing. Further, the opening angle of each protrusion 26 is set smaller than the opening angle of each permanent magnet 23. Also, between the salient pole magnetic poles Pn, Ps (projections 26) and the magnetic poles Mn, Ms (permanent magnet 23) having different polarities, that is, the N pole salient pole Pn and the S pole magnet magnetic pole Ms. And gaps K2 are formed between the S pole salient pole Ps and the N pole magnet magnetic pole Mn.

  The rotor 21 having the above configuration is configured as an 8-pole rotor in which N poles and S poles are alternately set at equal intervals in the circumferential direction (45 ° intervals) on the outer peripheral surface (that is, the surface facing the stator 11). . Specifically, the magnetic poles on the outer peripheral surface of the rotor 21 (that is, the surface facing the stator 11) are, in order in the clockwise direction, N pole magnetic pole Mn, S pole salient pole Ps, N pole salient pole. The Pn, S pole magnetic pole Ms, N pole magnetic pole Mn,... Are repeated. Further, the magnet magnetic pole Mn and salient pole magnetic pole Pn constituting the north pole of the rotor 21 are alternately arranged at equal circumferential intervals (90 ° intervals) in the circumferential direction. The magnet magnetic pole Ms and salient pole magnetic pole Ps which comprise are arrange | positioned alternately by the center position of the circumferential direction at equal angular intervals (90 degree space | interval).

  The rotor core 22 is formed with four slit holes 27 extending along the radial direction of the rotating shaft 24. The slit holes 27 are arranged at intervals of 90 ° in the circumferential direction, and are respectively provided at the boundary between the salient poles Pn and Ps adjacent in the circumferential direction and the boundary between the magnet magnetic poles Mn and Mn adjacent in the circumferential direction. It has been. Each slit hole 27 extends from a position in the vicinity of the fixed hole 22a of the rotor core 22 where the rotating shaft 24 is fixed to a position in the vicinity of the permanent magnet 23 and the protrusion 26 along the radial direction. In this embodiment, each slit hole 27 penetrates the rotor core 22 in the axial direction. Since each slit hole 27 is a gap and has a larger magnetic resistance than the magnetic metal rotor core 22, the magnetic flux of each permanent magnet 23 passing through the rotor core 22 by each slit hole 27 is applied to the adjacent salient poles Pn and Ps. It is preferably guided (see the broken arrow in FIG. 1 (a)).

Next, the operation of this embodiment will be described.
A three-phase drive current (AC) having a phase difference of 120 ° is supplied from a drive circuit (not shown) to the U-phase windings U1 to U4, the V-phase windings V1 to V4, and the W-phase windings W1 to W4, respectively. And each winding U1-W4 is excited at the same timing for every phase, a rotating magnetic field generate | occur | produces in the stator 11, and the rotor 21 rotates based on the rotating magnetic field. At this time, the magnetic poles formed on the side of the stator 11 by supplying the three-phase drive currents have the same polarity for each phase winding U1 to W4.

  As described above, the number of pole pairs of the rotor 21 (that is, the number of N poles and S poles) is the same as the number of windings U1 to W4 of each phase ("4" in this embodiment). Yes. Thus, when the rotor 21 rotates, for example, when one of the N poles (magnet magnetic pole Mn and salient pole Pn) of the rotor 21 is opposed to the U-phase winding U1 in the radial direction, the other N pole is The phase windings U2 to U4 are opposed to each other in the radial direction (see FIG. 1A).

  Here, half of the four N poles of the rotor 21 are constituted by salient pole magnetic poles Pn formed by the protrusions 26, and each salient pole magnetic pole Pn functions by the magnetic field of the permanent magnet 23 of the adjacent magnet magnetic pole Ms. Since it is a pseudo magnetic pole, the magnetic force applied to the stator 11 side is weaker than the magnet magnetic pole Mn by the permanent magnet 23. The same applies to the S pole (the salient pole magnetic pole Ps and the magnet magnetic pole Ms) of the rotor 21.

  Thereby, for example, with respect to the interlinkage magnetic flux φx interlinking the U-phase windings U1 to U4 (U-phase windings U1 and U3 in the example shown in FIG. 1A) facing each magnet magnetic pole Mn, The interlinkage magnetic flux φy interlinking the U-phase windings U1 to U4 (U-phase windings U2 and U4 in the example shown in FIG. 1A) facing the salient pole Pn is reduced. Therefore, an induced voltage generated in the U-phase winding (winding facing the salient pole magnetic pole Pn) in which the linkage flux φy is generated is applied to the U-phase winding (winding facing the magnet magnetic pole Mn) in which the linkage flux φx is generated. It becomes smaller than the induced voltage. Therefore, the combined induced voltage obtained by synthesizing the induced voltages generated in the U-phase windings U1 to U4 is a pair of U-phase windings facing the salient pole Pn (in FIG. 1A, U-phase windings U2 and U4). ). Here, the U-phase windings U1 to U4 have been described by taking as an example the decrease in the combined induced voltage when facing the N pole (magnet magnetic pole Mn and salient pole Pn) of the rotor 21, but the V-phase windings V1 to The same applies to the V4 and W-phase windings W1 to W4, and similarly to the S pole (magnet magnetic pole Ms and salient pole magnetic pole Ps) of the rotor 21, the resultant induced voltage decreases due to the salient pole magnetic pole Ps.

Next, characteristic effects of the present embodiment will be described.
(1) The winding 13 of the stator 11 includes four U-phase windings U1 to U4, V-phase windings V1 to V4, and W-phase windings W1 to W4, respectively, corresponding to the supplied three-phase driving current. Thus, the four windings of each phase are connected in series. That is, the winding 13 of the stator 11 includes at least two windings (first winding and second winding) connected in series in each phase.

  The N pole of the rotor 21 is composed of a magnet magnetic pole Mn using the permanent magnet 23 and a salient pole magnetic pole Pn using the protrusion 26 of the rotor core 22, and the magnet magnetic pole Mn is in any of the U, V, and W phases. The salient pole magnetic pole Pn faces the second winding (for example, U-phase windings U2, U4) of the same phase at the rotational position of the rotor 21 facing the first winding (for example, U-phase windings U1, U3). Configured to do. Similarly, the S pole of the rotor 21 is composed of a magnet magnetic pole Ms using the permanent magnet 23 and a salient pole Ps using the protrusion 26 of the rotor core 22, and the magnet magnetic pole Ms is any one of U, V, and W phases. Second windings (for example, U-phase windings U2, U4) in which the salient pole magnetic pole Ps is in phase at the rotational position of the rotor 21 facing the first winding (for example, U-phase windings U1, U3) of It is comprised so that it may oppose.

  According to this configuration, the magnetic force of all the N poles (or S poles) facing the in-phase winding 13 in the rotor 21 is not weakened, but a part of them is used as the salient pole magnetic pole Pn (the salient pole magnetic pole Ps). The magnetic force is weakened. As a result, it is possible to suppress the combined induction voltage generated in the in-phase winding 13 by the magnetic poles of the rotor 21 as much as possible while suppressing a reduction in torque as much as possible. As a result, it is possible to increase the rotation of the motor 10. Further, since the magnetic poles having a weak magnetic force with respect to the magnet magnetic poles Mn and Ms are constituted by the salient pole magnetic poles Pn and Ps formed by the protrusions 26 of the rotor core 22 (that is, a so-called continuous pole type rotor structure), Torque reduction due to weakening the magnetic force of some magnetic poles of the rotor 21 can be suppressed as much as possible.

  Note that, in the winding mode in which the windings 13 are connected in series in each phase as in the present embodiment, the sum of the induced voltages generated in the respective windings for each phase becomes the combined induced voltage. The voltage tends to increase. Therefore, by providing the salient poles Pn and Ps as described above in the configuration in which the winding 13 is in series in each phase, the effect of suppressing the combined induced voltage can be obtained more remarkably, and the motor high This is more suitable for rotation.

  (2) 2n U-phase windings U1 to U4, V-phase windings V1 to V4, and W-phase windings W1 to W4 (n is an integer of 2 or more, and n = 2 in this embodiment) The number of magnet magnetic poles Mn, Ms and salient pole magnetic poles Pn, Ps of the rotor 21 is n (that is, two). That is, since the magnet magnetic poles Mn, Ms and salient pole magnetic poles Pn, Ps are composed of the same number (half the number of windings of each phase), the magnet magnetic pole Mn and salient pole magnetic pole Pn (magnet magnetic pole Ms and salient pole magnetic pole). Ps) can be alternately provided at equal intervals in the circumferential direction. As a result, the magnet magnetic pole Mn and salient pole magnetic pole Pn (magnet magnetic pole Ms and salient pole magnetic pole Ps) having different magnetic force and mass are arranged in a balanced manner in the circumferential direction, and the rotor 21 is magnetically and mechanically balanced. It can be set as the outstanding structure.

  (3) The salient poles Pn and Ps are configured to be adjacent to the magnet poles Mn and Ms of different polarities using the permanent magnets 23 in the circumferential direction, so that the salient poles are generated by the magnetic field of the magnet pole Ms having the S pole, for example. The magnetic pole Pn can be made to function suitably as an N pole.

  (4) Since the gap K2 is provided between the salient pole magnetic poles Pn and Ps and the magnet magnetic poles Mn and Ms having different polarities, the magnetic flux density at the boundary between the salient pole magnetic poles Pn and Ps and the magnet magnetic poles Mn and Ms. As a result, it is possible to reduce torque pulsation.

  (5) The N pole salient pole Pn and the S pole salient pole Ps are configured to be adjacent to each other in the circumferential direction via the gap K1. That is, since the gap K1 is provided between the N salient pole Pn and the S salient pole Ps adjacent to each other, the magnetic flux amounts of the salient poles Pn and Ps of each pole are adjusted to a desired value. As a result, the output characteristics of the motor 10 can be easily adjusted.

  (6) The rotor core 22 is formed with a slit hole 27 (magnetic adjustment portion) for guiding the magnetic flux flowing through the rotor core 22. According to this configuration, the amount of magnetic flux of the salient poles Pn and Ps magnetized by the permanent magnets 23 adjacent in the circumferential direction can be easily adjusted to a desired value, and as a result, the output characteristics of the motor 10 can be easily adjusted. Is possible. Specifically, the slit hole 27 formed at the boundary between the magnet magnetic poles Mn and Mn adjacent in the circumferential direction suppresses a short circuit of the magnetic flux between the magnet magnetic poles Mn and Ms. Therefore, it is possible to suppress a decrease in the amount of magnetic flux from each magnet magnetic pole Mn, Ms toward the adjacent salient pole magnetic poles Pn, Ps, and as a result, it is possible to contribute to higher torque.

  (7) The magnet magnetic poles Mn and Ms are formed by fixing the permanent magnet 23 to the outer peripheral surface (magnet fixing portion 25) of the rotor core 22. That is, since the rotor 21 has a surface magnet type structure (SPM structure), it can contribute to the high torque of the motor 10.

In addition, you may change the said embodiment as follows.
Although not specifically mentioned in the above embodiment, field weakening control may be performed when the rotor 21 is rotating at a high speed. In the above embodiment, the rotor 21 is provided with salient poles Pn and Ps that do not spontaneously generate magnetic flux, so that the field-weakening current supplied to the winding 13 can be kept small. Since the field weakening current can be reduced, the permanent magnet 23 is difficult to demagnetize during field weakening control, and the copper loss of the winding 13 can be suppressed. In other words, since the amount of flux linkage that can be reduced with the same amount of field-weakening current increases, higher rotation by field-weakening control can be obtained more effectively.

  In the above-described embodiment, two protrusions 26 of the rotor core 22 are provided between the circumferential directions of the magnet fixing portions 25. In addition to this, for example, as shown in FIG. One may be provided between the circumferential directions. As shown in the figure, the slit hole 27 provided along the boundary between the salient poles Pn and Ps adjacent to each other in the circumferential direction extends to the projecting portion 26, so that the magnetic flux of the permanent magnet 23 is increased. It is more preferable in terms of flowing through the salient pole magnetic poles Pn and Ps.

  The arrangement of the slit holes 27 formed in the rotor core 22 and the configuration such as the shape are not limited to the above embodiment and the example shown in FIG. 3, and may be configured as shown in FIGS. 4 to 7, for example. . 4 to 7 show the type of the above embodiment (a type in which the protrusion 26 is divided into two) as an example, but the protrusion 26 as in the example shown in FIG. 3 is divided. It can be applied to other types.

  In the example shown in FIG. 4, the slit hole 27 is arranged on the inner side in the radial direction of each permanent magnet 23 and at a position corresponding to the center in the circumferential direction of each permanent magnet 23. Thus, by arranging the slit hole 27 on the radially inner side of the permanent magnet 23, the magnetic flux of the permanent magnet 23 passing through the rotor core 22 is branched to both sides in the circumferential direction of the slit hole 27 (in FIG. 4, broken lines). (See arrow for.) Thereby, according to the circumferential direction position of the slit hole 27 in the radial direction inner side of the permanent magnet 23, the amount of magnetic flux between the adjacent protrusions 26 (the salient pole magnetic poles Pn, Ps) in each permanent magnet 23, and adjacent. The amount of magnetic flux between the permanent magnet 23 (magnet magnetic poles Mn, Ms) can be determined, and the output characteristics of the motor 10 can be adjusted more suitably.

  Moreover, in the example shown in FIG. 5, each slit hole 27 has comprised the curved shape which becomes convex toward radial inside. More specifically, each slit hole 27 extends radially inward of each permanent magnet 23 from the position corresponding to the center in the circumferential direction of each permanent magnet 23 to the inner peripheral side, and from the adjacent protrusion 26 side. And extends to the vicinity of the boundary between the salient pole magnetic poles Pn and Ps. Even with this configuration, it is possible to obtain substantially the same effect as in the example of FIG.

  For example, as shown in FIG. 6, the auxiliary magnet 28 may be fitted into the slit hole 27. In this configuration, the slit hole 27 and the auxiliary magnet 28 constitute a magnetic adjustment unit. Further, the auxiliary magnet 28 is composed of, for example, a neodymium magnet, a samarium cobalt (SmCo) magnet, an SmFeN-based magnet, a ferrite magnet, an alnico magnet, or the like, and may be composed of a sintered magnet or a bonded magnet.

  In the example shown in FIG. 6, the auxiliary magnet 28 is provided in a slit hole (slit hole 27 a in FIG. 6) provided at the boundary between the salient poles Pn and Ps adjacent in the circumferential direction. That is, the auxiliary magnet 28 is provided at the boundary between the N-pole salient pole Pn and the S-pole salient pole Ps. The auxiliary magnet 28 has a magnetic orientation substantially along the circumferential direction of the rotor 21 and is magnetized so that the circumferential salient pole Pn side is the N pole and the circumferential salient pole Ps side is the S pole. Yes.

  According to such a configuration, not only the magnetic flux of the permanent magnet 23 but also the magnetic flux of the auxiliary magnet 28 flows through the salient pole magnetic poles Pn and Ps, so that the magnetic flux flowing through the salient pole magnetic poles Pn and Ps increases. This can contribute to an increase in torque of the motor 10. In this case as well, it is preferable that the magnetic force applied from the rotor 21 to the stator 11 side is weaker at the salient pole magnetic poles Pn and Ps than at the magnet magnetic poles Mn and Ms.

  In the same example, the output characteristics of the motor 10 can be easily adjusted by making the magnetic characteristics (residual magnetic flux density and coercive force) of the auxiliary magnet 28 different from those of the permanent magnet 23. Since the auxiliary magnet 28 is embedded in the rotor core 22 and is not easily affected by an external magnetic field, the coercive force can be set small (or the residual magnetic flux density can be set high).

  Further, in the configuration in which the auxiliary magnet 28 is provided, a configuration in which the slit hole 27 similar to that in FIGS. 4 and 5 is applied may be used. FIG. 7 shows a configuration in which the same slit hole 27 as in FIG. 5 is applied to the configuration in which the auxiliary magnet 28 is provided.

  In the rotor 21 of the above embodiment, the N pole magnet magnetic poles Mn and the salient pole magnetic poles Pn are provided at positions facing each other by 180 ° in the circumferential direction, and similarly on the S pole side, The salient pole magnetic poles Ps are provided at 180 ° facing positions in the circumferential direction. That is, although the magnet magnetic pole Mn and the salient pole magnetic pole Pn are alternately arranged in the circumferential direction, and the magnet magnetic pole Ms and the salient pole magnetic pole Ps are also alternately arranged in the circumferential direction, it is not particularly limited to this. For example, an N-pole salient pole Pn may be provided at a position 180 ° opposite to the N-pole magnet magnetic pole Mn. Similarly, an S-pole salient pole Ps may be provided at a position 180 ° opposite to the S-pole magnet magnetic pole Ms.

  In the above embodiment, the number of magnet magnetic poles Mn and salient pole magnetic poles Pn is the same number (half the number of windings 13 in each phase, ie, two) in the N pole of the rotor 21, for example. There is no need. For example, the number of magnet magnetic poles Mn may be three (or one), and the number of salient pole magnetic poles Pn may be one (or three). The same change may be made on the S pole side (magnet magnetic pole Ms and salient pole magnetic pole Ps) of the rotor.

  In the above embodiment, the salient pole magnetic pole Pn and the salient pole magnetic pole Ps are provided in the N pole and the S pole of the rotor 21, respectively. However, the present invention is not limited to this. For example, only one pole of the rotor 21 is provided. A salient pole may be provided, and the other pole may be composed entirely of magnet poles.

  In the above embodiment, the windings of the respective phases, that is, the U-phase windings U1 to U4, the V-phase windings V1 to V4, and the W-phase windings W1 to W4 are connected in series, respectively. However, the winding mode may be changed as appropriate.

  For example, in the example shown in FIG. 8, in the U phase, the windings U1, U2 are connected in series, and the windings U3, U4 are connected in series. The series pair of the windings U1, U2 and the windings U3, U4 Are connected in parallel. Similarly, in the V phase, the windings V1 and V2 are connected in series, and the windings V3 and V4 are connected in series. The series pair of the windings V1 and V2 and the series pair of the windings V3 and V4 are parallel. It is connected. Similarly, in the W phase, the windings W1, W2 are connected in series, and the windings W3, W4 are connected in series. The series pair of the windings W1, W2 and the series pair of the windings W3, W4 Are connected in parallel.

  In the case of the configuration of the rotor 21 of the above embodiment (see FIG. 1), for example, in the U phase, induced voltages having the same magnitude are generated in the winding U1 and the winding U3. In addition, induced voltages having the same magnitude are generated in the winding U2 and the winding U4. For this reason, the combined induced voltage generated in the series pair of the windings U1 and U2 is substantially equal to the combined induced voltage generated in the series pair of the windings U3 and U4. Thereby, the reduction of the induced voltage due to the provision of the salient poles Pn and Ps always occurs in both the series pair of the windings U1 and U2 and the series pair of the windings U3 and U4. Since the series pair of the windings U1 and U2 and the series pair of the windings U3 and U4 are parallel, the combined induced voltage in the entire U-phase winding is the combined induced voltage of the series pair of the windings U1 and U2 ( And the combined induction voltage of the series pair of windings U3 and U4), and the combined induction voltage in the entire U-phase winding can be effectively suppressed.

  Here, when the winding U2 and the winding U3 are interchanged in the example shown in FIG. 8, that is, when the windings U1, U3 and the windings U2, U4 having the same magnitude of the induced voltage are connected in series, respectively. think of. In this case, the reduction of the induced voltage due to the provision of the salient poles Pn and Ps occurs only in one of the series pair of the windings U2 and U4 and the series pair of the windings U1 and U3. Does not decrease. And since the series pair of winding U1, U3 and the series pair of winding U2, U4 are parallel, it is disadvantageous at the point which suppresses the synthetic | combination induced voltage in the whole U-phase winding effectively. Similarly, when the U-phase windings U1 to U4 are arranged in parallel, it is disadvantageous in that the combined induced voltage in the entire U-phase winding is effectively suppressed.

  As described above, when the windings are arranged in series in each phase, the magnetic pole Mn (magnet magnetic pole Ms) and the salient pole magnetic pole Pn (salient pole magnetic pole Ps) are opposed to each other at a predetermined rotational position of the rotor 21. By connecting the windings (for example, the U-phase winding U1 and the U-phase winding U2) in series, the weak induced voltage generated in the same-phase winding and the strong induced voltage are added to form a combined induced voltage. And the combined induction voltage in each phase can be effectively suppressed.

  In the example of the figure, in the U phase, the windings U1 and U2 and the windings U3 and U4 are each a series pair, but the windings U1 and U4 and the windings U2 and U3 are each a serial pair. Similar effects can be obtained. The same change can be made in the V phase and the W phase.

  In the example shown in the figure, in the U phase, the series pair of the windings U1 and U2 and the series pair of the windings U3 and U4 are connected in parallel. However, the present invention is not particularly limited to this, and the winding U1 , U2 and the series pair of windings U3, U4 may be separated, and a pair of inverters may be provided to supply a U-phase drive current to each of the separated series pairs. The same effect can be obtained by this configuration. The same change can be made in the V phase and the W phase.

Moreover, in the example shown in the said embodiment (refer FIG. 2) and FIG. 8, although the connection aspect of the coil | winding was made into the star connection, it may be not only this but a delta connection, for example.
The rotor 21 of the above embodiment has a surface magnet type structure (SPM structure) in which the permanent magnets 23 constituting the magnet magnetic poles Mn and Ms are fixed to the outer peripheral surface (magnet fixing portion 25) of the rotor core 22. For example, as shown in FIG. 9, an embedded magnet type structure (IPM structure) may be used in which a permanent magnet 23 a is embedded in an inner portion of the outer peripheral surface 22 b of the rotor core 22.

  In the example shown in the figure, the outer peripheral surface 22b of the rotor core 22 has a circular shape when viewed in the axial direction, and the radially outer side surface and the radially inner side surface of each permanent magnet 23a constituting the magnetic poles Mn and Ms are viewed in the axial direction. The arc shape is centered on the central axis of the rotor core 22 (the axis L of the rotating shaft 24).

  The rotor 21 shown in the figure is configured as an 8-pole rotor in which N poles and S poles are alternately set at equal intervals in the circumferential direction (45 ° intervals) on the outer peripheral surface 22b, as in the above embodiment. . Specifically, the magnetic pole adjacent to the N-pole magnet magnetic pole Mn in the circumferential direction (the magnetic pole opposite to the magnet magnetic pole Ms) is configured as a core magnetic pole Cs formed of a part of the rotor core 22, and the core magnetic pole Cs is The magnetic pole Mn functions as a magnetic pole of the S pole by the magnetic field of the permanent magnet 23a. Similarly, the magnetic pole adjacent to the S-pole magnet magnetic pole Ms in the circumferential direction (the magnetic pole opposite to the magnet magnetic pole Mn) is configured as a core magnetic pole Cn composed of a part of the rotor core 22, and the core magnetic pole Cn is a magnet. It functions as a magnetic pole of N pole by the magnetic field of the permanent magnet 23a of the magnetic pole Ms.

  That is, the magnetic poles on the outer peripheral surface of the rotor 21 are, in order in the clockwise direction, N-pole magnet magnetic pole Mn, S-pole core magnetic pole Cs, N-pole core magnetic pole Cn, S-pole magnet magnetic pole Ms, and N-pole magnet magnetic pole. Mn,... Are repeated. Further, the magnet magnetic pole Mn and the core magnetic pole Cn constituting the N pole of the rotor 21 are alternately arranged so that the circumferential center positions thereof are equiangularly spaced (90 ° intervals). The magnetic pole Ms and the core magnetic pole Cs that constitute the S pole are alternately arranged so that their circumferential center positions are equiangularly spaced (90 ° intervals).

  The rotor core 22 has a pair of slit holes 31 extending along the radial direction at the boundary between the core magnetic poles Cn and Cs adjacent in the circumferential direction, and the radial direction at the boundary between the magnetic poles Mn and Ms adjacent in the circumferential direction. A pair of slit holes 32 extending along the line are formed. These slit holes 31 and 32 are alternately formed at equal intervals in the circumferential direction (90 ° intervals).

  Each slit hole 31 and 32 is a space, and penetrates the rotor core 22 in the axial direction. Moreover, each slit hole 31 and 32 has comprised the rectangle by the axial view. Further, the slit hole 31 between the core magnetic poles Cn and Cs extends from the position near the fixed hole 22a to the position near the outer peripheral surface 22b of the rotor core 22 along the radial direction. Further, the slit hole 32 between the magnet magnetic poles Mn and Ms extends from the position near the fixed hole 22a to the position near the permanent magnet 23a along the radial direction.

  Since the slit holes 31 and 32 are air gaps, the magnetic resistance is larger than that of the magnetic metal rotor core 22, so that the magnetic poles of the permanent magnets 23 a passing through the rotor core 22 by the slit holes 31 and 32 are adjacent to each other. It is suitably guided to Cn and Cs (see broken line arrows in FIG. 9).

  In the rotor 21 having the SPM structure as in the above embodiment, since the permanent magnet 23 fixed to the outer peripheral surface of the rotor core 22 directly faces the stator 11, high torque can be obtained, but the permanent magnet 23 is used during field-weakening control. It becomes easy to demagnetize. In that respect, in the rotor 21 having the IPM structure, the permanent magnets 23a constituting the magnetic poles Mn and Ms are embedded in the rotor core 22, so that demagnetization of the permanent magnets 23 during field-weakening control can be suppressed. .

  Further, the rotor core 22 is formed with slit holes 31 and 32 (magnetic adjustment portions) for guiding the magnetic flux flowing through the rotor core 22. According to this configuration, it is easy to adjust the magnetic flux amount of the core magnetic poles Cn and Cs magnetized by the permanent magnets 23a adjacent in the circumferential direction to a desired value, and as a result, the output characteristics of the motor can be easily adjusted. It becomes. In the example shown in FIG. 9, the slit hole 31 between the core magnetic poles Cn and Cs may be omitted.

  Further, the rotor 21 shown in FIG. 10 is a modification of the configuration shown in FIG. 9, and an auxiliary magnet 33 is provided in each slit hole 31 between the core magnetic poles Cn and Cs. Each auxiliary magnet 33 is magnetized so that the core pole Cn side in the circumferential direction is an N pole and the core pole Cs side is an S pole. The auxiliary magnet 33 is constituted by, for example, a neodymium magnet, a samarium cobalt (SmCo) magnet, an SmFeN-based magnet, a ferrite magnet, an alnico magnet, or the like, and may be any of a sintered magnet and a bonded magnet.

  According to such a configuration, since not only the magnetic flux of the permanent magnet 23a but also the magnetic flux of the auxiliary magnet 33 flows in the core magnetic poles Cn and Cs, the magnetic flux flowing in the core magnetic poles Cn and Cs increases, and as a result, Can contribute to higher torque. In this case as well, it is preferable that the magnetic force applied from the rotor 21 to the stator 11 side is weaker at the core magnetic poles Cn and Cs than at the magnetic poles Mn and Ms.

  The location of the auxiliary magnet 33 is not limited to the slit hole 31 between the core magnetic poles Cn and Cs. As shown in FIG. 11, the auxiliary magnet 33 is provided in the slit hole 32 between the magnet magnetic poles Mn and Ms. May be. In this case, each auxiliary magnet 33 is preferably magnetized so that the magnet magnetic pole Ms side in the circumferential direction is an N pole and the magnet magnetic pole Mn side is an S pole. Even with the configuration shown in the figure, it is possible to increase the magnetic flux flowing through the core magnetic poles Cn and Cs, and as a result, it is possible to contribute to an increase in torque of the motor. In the configuration shown in FIG. 11, the auxiliary magnet 33 is provided at the radially inner end of the slit hole 32. However, the arrangement position of the auxiliary magnet 33 in the slit hole 32 is limited to the configuration shown in FIG. Instead, it can be appropriately changed according to the configuration.

  Further, the rotor 21 shown in FIG. 12 is obtained by changing the configuration shown in FIG. 9, and is formed with a communication portion 34 that connects the slit hole 31 and the slit hole 32 at their inner end portions. In the example shown in the figure, in the rotor core 22, the pair of support portions 22d that support the center portion 22c having the fixed hole 22a divide the slit hole 31 along the boundary portion between the core magnetic poles Cn and Cs. Is formed. The communication part 34 becomes a magnetic resistance between the adjacent core magnetic poles Cn and Cs and between the adjacent magnet magnetic poles Mn and Ms at the radially inner ends of the slit holes 31 and 32. According to such a configuration, the short-circuit magnetic flux that can be generated between the permanent magnets 23a constituting the magnet magnetic poles Mn and Ms by the communication portion 34 can be reduced. For this reason, the magnetic flux which flows into core magnetic pole Cn, Cs increases, As a result, it can contribute to the high torque increase of a motor.

  Further, the rotor 21 shown in FIG. 13 is a modification of the configuration shown in FIG. 12, and in the rotor core 22, a pair of support portions 22 e that support the center portion 22 c is along the boundary between the magnet magnetic poles Mn and Ms. Thus, the slit hole 32 is formed to be divided. According to this configuration, the central portion 22c of the rotor core 22 can be stably supported by the support portions 22d and 22e. In the example shown in FIG. 13, the support 22d may be omitted.

  Further, the rotor 21 shown in FIG. 14 is a modification of the configuration shown in FIG. 13, and an auxiliary magnet 35 is provided in each communication portion 34. The auxiliary magnet 35 provided in the communication portion 34 formed across the N-pole core magnetic pole Cn and the S-pole magnet magnetic pole Ms is magnetized so that the radially outer side becomes the N pole. Further, the auxiliary magnet 35 provided in the communication portion 34 formed across the S-pole core magnetic pole Cs and the N-pole magnet magnetic pole Mn is magnetized so that the radially outer side becomes the S pole. One end of each auxiliary magnet 35 (the end opposite to the slit hole 31) is set at a position corresponding to the boundary line between the core magnetic poles Cn and Cs and the magnet magnetic poles Mn and Ms. Even with the configuration shown in the figure, it is possible to increase the magnetic flux flowing through the core magnetic poles Cn and Cs, and as a result, it is possible to contribute to an increase in torque of the motor. In the configuration shown in FIG. 14, the auxiliary magnet 35 is provided at a position near the core magnetic poles Cn and Cs in each communication portion 34, but the arrangement position of the auxiliary magnet 35 in the communication portion 34 is limited to the configuration shown in FIG. 14. However, it can be appropriately changed according to the configuration.

  In the above embodiment, the rotor 21 has 8 poles and the number of windings 13 of the stator 11 is 12 (that is, the motor configuration has 8 poles and 12 slots). The number of can be appropriately changed according to the configuration. For example, the number of poles of the rotor 21 and the number of windings 13 are appropriately changed so that the relationship between the number of poles of the rotor 21 and the number of windings 13 is 2n: 3n (where n is an integer of 2 or more). May be.

  In the case of a configuration of 6 poles 9 slots, 10 poles 15 slots, etc. (when the number of poles of the rotor 21 and the greatest common divisor n of the number of windings 13 is an odd number), the number of pole pairs of the rotor 21 is an odd number, That is, the number of N poles and S poles is an odd number. For this reason, for example, the number of magnet magnetic poles Mn and salient pole magnetic poles Pn cannot be the same, resulting in a magnetically unbalanced configuration. In that respect, in the configuration in which the greatest common divisor n of the number of poles of the rotor 21 and the number of windings 13 is an even number as in the above embodiment, the number of magnet magnetic poles Mn and salient pole magnetic poles Pn can be the same. A magnetically balanced configuration can be achieved.

  The relationship between the number of poles of the rotor 21 and the number of windings 13 is not necessarily 2n: 3n (where n is an integer equal to or greater than 2), for example, 10 poles 12 slots, 14 poles 12 slots, etc. It may be configured.

  FIG. 15 shows an example of a motor 30 configured with 10 poles and 12 slots. In the example of FIG. 15, the same components as those in the above embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different portions are described in detail.

  In the motor 30 shown in the figure, the 12 windings 13 of the stator 11 are classified according to the supplied three-phase drive currents (U phase, V phase, W phase), and are counterclockwise in FIG. In this order, U1, bar U2, bar V1, V2, W1, bar W2, bar U1, U2, V1, bar V2, bar W1, W2. In addition, U phase winding bar U1, bar U2, V phase winding bar V1 with respect to U phase windings U1, U2, V phase windings V1, V2 and W phase windings W1, W2 constituted by positive windings. , Bar V2, W-phase winding bar W1, bar W2 are constituted by reverse winding. Further, the U-phase winding U1 and the bar U1 are placed at positions facing each other by 180 °, and similarly, the U-phase winding U2 and the bar U2 are placed at positions facing each other by 180 °. The same applies to the other phases (V phase and W phase).

  U-phase windings U1, U2, U1 and U2 are connected in series. Similarly, V-phase windings V1, V2, V1 and V2 are connected in series, and W-phase winding W1. , W2, bar W1, and bar W2 are connected in series. The U-phase windings U1, U2, U1 and U2 are supplied with U-phase drive current. As a result, the reverse winding U-phase winding bars U1 and U2 are always excited with the opposite polarity (reverse phase) with respect to the forward winding U-phase windings U1 and U2, but the excitation timing is the same. . The same applies to the other phases (V phase and W phase).

  The rotor 21 of the motor 30 is a 10-pole rotor in which N poles and S poles are alternately set at equal intervals in the circumferential direction (36 ° intervals), and includes three magnet magnetic poles Mn, two magnet magnetic poles Ms, and 2 Two salient poles Pn and three salient poles Ps are provided. Specifically, the magnetic poles of the rotor 21 are arranged in the clockwise direction in the order of S pole magnet pole Ms, N pole magnet pole Mn, S pole salient pole Ps, N pole magnet pole Mn, and S pole magnet. The magnetic pole Ms, the N pole salient pole Pn, the S pole salient pole Ps, the N pole magnet magnetic pole Mn, the S pole salient pole Ps, and the N pole salient pole Pn. That is, the S-pole salient pole Ps is located on the opposite side of the N-pole magnet magnetic pole Mn in the circumferential direction (180 ° opposite position), and the N-pole is located on the opposite side in the circumferential direction of the S-pole magnet magnetic pole Ms (180 ° opposite position). The salient pole magnetic pole Pn of the pole is located. The rotor core 22 is similar to the above embodiment at positions corresponding to the boundary between the magnet magnetic poles Mn and Ms adjacent in the circumferential direction and the boundary between the salient pole magnetic poles Pn and Ps adjacent in the circumferential direction. A slit hole 27 is formed.

  Note that the number of magnet magnetic poles Mn, Ms and salient pole magnetic poles Pn, Ps is not limited to the example of the 10-pole rotor of FIG. 15. For example, two magnet magnetic poles Mn, three magnet magnetic poles Ms, You may comprise three salient pole magnetic poles Pn and two salient pole magnetic poles Ps. Further, in the rotor 21 in the example shown in FIG. 15, a slit hole 27 as shown in FIG. 4 or 5 may be added, and an auxiliary magnet 28 is provided in the slit hole 27a as shown in FIG. 6 or FIG. A fitted configuration may be added.

  In the above configuration, when the rotor 21 rotates, for example, when the S-pole magnet magnetic pole Ms faces the U-phase winding U1 in the radial direction, the N-pole salient pole Pn is placed on the U-phase winding on the opposite side in the circumferential direction. It faces the bar U1 in the radial direction (see FIG. 15). In other words, one of the magnetic poles having different polarities facing the windings 13 (for example, the U-phase winding U1 and the bar U1) excited in opposite phases (same timing), one of which is composed of the magnet magnetic pole Ms (magnet magnetic pole Mn). The other is composed of salient pole magnetic poles Pn (saliency pole magnetic poles Ps). As a result, it is possible to suppress the combined induction voltage (for example, the combined induction voltage of the U-phase winding U1 and the bar U1) generated in the antiphase winding 13 by the magnetic poles of the rotor 21 while suppressing the torque reduction as much as possible. As a result, the rotation of the motor 30 can be increased.

  The arrangement of the magnetic poles of the rotor 21 is not limited to the example shown in FIG. 15, and the salient pole Ps is located on the opposite side of the magnet magnetic pole Mn in the circumferential direction, and on the opposite side of the magnet magnetic pole Ms in the circumferential direction. If the salient pole magnetic pole Pn is located, the arrangement of the magnetic poles of the rotor 21 can be changed as appropriate.

  Further, on the stator 11 side, it is not necessary that all the U-phase windings U1, U2, U1 and U2 are connected in series, and the windings U1, U1 and U2, U2 are separated from each other. It may be configured as a series pair. Moreover, it can change similarly also in V phase and W phase.

  FIG. 15 shows an example of 10 poles and 12 slots, but the present invention can also be applied to a 14 poles and 12 slots structure. Further, the present invention can also be applied to a configuration in which the number of rotor poles and the number of slots of 10 poles and 12 slots (or 14 poles and 12 slots) are equal. Further, FIG. 15 shows an example of a type in which the protrusion 26 is divided into a plurality according to the magnetic pole, but the present invention is also applicable to a type in which the protrusion 26 is not divided as in the example shown in FIG. .

  In the above embodiment, the magnetic flux guiding part (magnetism) for guiding the magnetic flux of the magnet magnetic poles Mn and Ms to the circumferential center CL side (the circumferential direction center side of the projecting part 26) of the salient pole magnetic poles Pn and Ps (projecting part 26). An adjustment unit) may be provided in the rotor core 22.

  For example, in the configuration shown in FIG. 16, a magnetic flux guiding recess 26a serving as the magnetic flux guiding portion is formed on the radially outer surface of each salient pole magnetic pole Pn, Ps. More specifically, on the radially outer side surface of each salient pole magnetic pole Pn (projection 26), the magnetic flux guiding recess 26a is formed at the end of the adjacent magnet magnetic pole Ms side. Similarly, on the radially outer side surface of each salient pole magnetic pole Ps (projection 26), the magnetic flux guiding recess 26a is formed at the end of the adjacent magnet magnetic pole Mn side. In the example shown in the figure, each magnetic flux guiding recess 26 a is set to about ¼ of the circumferential width of the protrusion 26. Further, the circumferential center CL of each protrusion 26 and the circumferential center of each permanent magnet 23 are set at equal circumferential intervals (45 ° intervals).

  According to such a configuration, for example, the magnetic flux φa from the magnet magnetic pole Ms (permanent magnet 23) to the adjacent salient pole magnetic pole Pn through the rotor core 22 is surrounded by the magnetic flux guiding recess 26a around the salient pole magnetic pole Pn (projection 26). It is guided to the direction center CL side. Thereby, the circumferential magnetic pole centers (peak positions of magnetic flux density) of the magnetic poles of the rotor 21 (that is, the magnetic magnetic poles Mn and Ms and the salient magnetic poles Pn and Ps) are equally spaced in the circumferential direction (example in the figure). Can be configured at intervals of 45 °, and as a result, can contribute to higher torque.

  In the example shown in the figure, the magnetic flux guiding portion (magnetic flux guiding recess 26a) is provided on the radially outer surface of the salient pole magnetic poles Pn and Ps. However, the location where the magnetic flux guiding portion is provided is not limited thereto. For example, holes (gap portions) formed in the rotor core 22 in the salient pole magnetic poles Pn and Ps may function as the magnetic flux guiding portions.

Moreover, although applied to the surface magnet type structure (SPM structure) in the same figure, you may apply to an embedded magnet type structure (IPM structure).
An example of the rotor 21 applied to the IPM structure is shown in FIG. In the rotor 21 shown in the figure, the arrangement of the magnetic poles (the circumferential positions of the magnetic poles Mn and Ms and the core magnetic poles Cn and Cs) is substantially the same as the above IPM structure (see, for example, the configuration of FIG. 9). is there. In other words, the magnetic poles of the rotor 21 are, in order in the clockwise direction, N pole magnetic pole Mn, S pole core pole Cs, N pole core pole Cn, S pole magnet pole Ms, N pole magnet pole Mn,.・ It has a structure that repeats.

  In the configuration shown in FIG. 17, each magnet magnetic pole Mn, Ms includes a pair of permanent magnets 41 embedded in the rotor core 22. In each of the magnetic poles Mn and Ms, the pair of permanent magnets 41 are arranged in a substantially V shape that expands to the outer peripheral side when viewed in the axial direction, and on the magnetic pole center line in the circumferential direction (see the straight line L1 in FIG. 17). On the other hand, they are provided in line symmetry. Each permanent magnet 41 forms a rectangular parallelepiped. Further, the pair of permanent magnets 41 in each of the magnetic poles Mn and Ms has an angular range when the rotor 21 is equally divided by the number of poles (the total number of the magnetic poles Mn and Ms and the core magnetic poles Cn and Cs) in the circumferential direction (this example) In the range of 45 °.

  Further, in the figure, the magnetization directions of the permanent magnets 41 of the N-pole magnet magnetic pole Mn and the S-pole magnet magnetic pole Ms are indicated by solid arrows, and the tip end side of the arrow represents the N pole and the base end side of the arrow represents the S pole. ing. As indicated by the arrows, the permanent magnets 41 in the N-pole magnet magnetic pole Mn have N faces on the faces facing each other (the face on the magnetic pole center line side) so that the outer peripheral side of the magnet magnetic pole Mn becomes the N-pole. Magnetized so that poles appear. Further, each permanent magnet 41 in the S magnetic pole Ms is magnetized so that the S pole appears on the surfaces facing each other (the surface on the side of the magnetic pole center line) so that the outer peripheral side of the magnet magnetic pole Ms becomes the S pole. ing.

  The rotor core 22 is formed with a pair of slit holes 31 extending along the radial direction at the boundary between the core magnetic poles Cn and Cs adjacent in the circumferential direction. Each slit hole 31 extends from the position near the fixed hole 22a to the position near the outer peripheral surface 22b of the rotor core 22 along the radial direction.

  Further, the rotor core 22 is formed with a magnetoresistive hole 42 (magnetic adjustment portion) at a position on the inner peripheral side of the pair of permanent magnets 41 in each of the magnetic poles Mn and Ms. Each magnetoresistive hole 42 is a rectangular hole that is long in the radial direction when viewed in the axial direction, and is provided at the center position in the circumferential direction of each magnet magnetic pole Mn, Ms. That is, in this example, the distance between the centers of the magnetic resistance holes 42 of the magnet magnetic poles Mn and Ms adjacent in the circumferential direction is set to 45 °.

  Each slit hole 31 and each magnetoresistive hole 42 penetrate the rotor core 22 in the axial direction, and each slit hole 31 and each magnetoresistive hole 42 are voids. Thereby, each magnetoresistive hole 42 suppresses the short circuit of the magnetic flux between the magnet magnetic poles Mn and Ms adjacent in the circumferential direction, and each slit hole 31 allows the magnetic flux of the magnet magnetic poles Mn and Ms to pass through the core magnetic poles Cn and Cs. Suppresses short circuit. That is, the magnetic fluxes of the magnet magnetic poles Mn and Ms passing through the rotor core 22 are suitably guided to the adjacent core magnetic poles Cn and Cs by the slit holes 31 and the magnetic resistance holes 42.

  Further, gaps K3 and K4 are provided on the inner peripheral side and the outer peripheral side of each permanent magnet 41, respectively. Each gap K3, K4 is a part of each magnet accommodating hole 44 that accommodates each permanent magnet 41 formed in the rotor core 22, and the inner peripheral side surface of each permanent magnet 41 faces each gap K3, The inner peripheral side surface of each permanent magnet 41 is configured to face each gap K4. That is, the gap K3 is provided between the permanent magnet 41 and the radially inner end of the magnet accommodation hole 44, and the gap K4 is provided between the permanent magnet 41 and the radially outer end of the magnet accommodation hole 44. Yes.

  The magnetic resistance of each of the gaps K3 and K4 can suppress the short circuit of the magnetic flux in each permanent magnet 41 (the magnetic flux of each permanent magnet 41 is short-circuited between its own N and S poles via the rotor core 22). It has become. That is, also by the gaps K3 and K4, the magnetic fluxes of the magnet magnetic poles Mn and Ms are preferably guided to the adjacent core magnetic poles Cn and Cs, which can contribute to higher torque.

  Here, the rotor core 22 of this example is formed with a magnetic flux guide hole 43 (magnetic flux guide portion) for guiding the magnetic flux of the magnet magnetic poles Mn and Ms toward the circumferential center CL of the core magnetic poles Cn and Cs. Each magnetic flux guide hole 43 is provided at a position near the magnet magnetic poles Mn and Ms adjacent to each other in the circumferential direction in each of the core magnetic poles Cn and Cs. More specifically, in each of the core magnetic poles Cn and Cs, the magnetic flux guide hole 43 communicates with a magnet accommodation hole 44 (magnet accommodation hole 44a in FIG. 17) in which the nearest permanent magnet 41 is accommodated, and the magnet accommodation. The hole 44a is formed so as to extend into the core magnetic poles Cn and Cs along the circumferential direction. Each magnetic flux guiding hole 43 is formed at a position corresponding to the radially outer end of the nearest permanent magnet 41. The radial width of each magnetic flux guide hole 43 is set to ¼ or less of the long side length of the permanent magnet 41 as viewed in the axial direction.

  According to such a configuration, for example, the magnetic flux φa directed from the magnet magnetic pole Ms to the adjacent core magnetic pole Cn through the rotor core 22 is guided to the circumferential center CL side of the core magnetic pole Cn by the magnetic flux guide hole 43. As a result, the magnetic pole centers (peak positions of magnetic flux density) in the circumferential direction of the magnetic poles of the rotor 21 (that is, the magnetic magnetic poles Mn and Ms and the core magnetic poles Cn and Cs) are equally spaced in the circumferential direction (in the example of FIG. 45 ° intervals), and as a result, it can contribute to higher torque.

  Further, according to the configuration of the magnet magnetic poles Mn and Ms of this example (arrangement configuration of the permanent magnet 41), it is possible to increase the rotor core volume (volume of the outer core portion 22g) on the outer peripheral side of the permanent magnet 41. Thus, the reluctance torque can be increased, which can contribute to further increase in torque.

  Further, in this example, a short circuit of the magnetic flux between the N-pole magnet magnetic pole Mn and the S-pole magnet magnetic pole Ms adjacent to each other in the circumferential direction is suppressed by the magnetoresistive hole 42, so that the magnet magnetic poles Mn and Ms are adjacent to each other. Decrease in the amount of magnetic flux toward the core magnetic poles Cn and Cs can be suppressed, and as a result, it is possible to contribute to higher torque. Further, since the magnetoresistive hole 42 is provided radially inward from the permanent magnet 41 in the magnet magnetic poles Mn and Ms in which the pair of permanent magnets 41 are arranged in a V shape, the magnetoresistive hole 42 is adjacent to the circumferential direction by the magnetoresistive hole 42. Short-circuiting of the magnetic flux between the magnet poles Mn and Ms having different polarities can be suitably suppressed.

  In this example, the core magnetic poles Cn and Cs adjacent in the circumferential direction are connected to each other at both ends in the radial direction of the slit hole 31. However, the present invention is not limited to this, and the core magnetic poles Cn and Cs are connected to the slit hole. You may comprise so that it may connect in any one of the radial direction inner side edge part of 31 and a radial direction outer side edge part. In the example shown in FIG. 17, each magnetoresistive hole 42 may extend radially inward to the inner peripheral surface (fixed hole 22 a) of the rotor core 22.

  Further, the configuration shown in FIG. 17 may be changed as follows. The rotor 21 shown in FIG. 18 has a configuration in which auxiliary magnets 51 are arranged in the respective slit holes 31 and auxiliary magnets 52 are arranged in the respective magnetic flux guide holes 43 of the configuration shown in FIG. Each auxiliary magnet 51 is provided at a position closer to the inside in the radial direction in each slit hole 31. Note that the radial length of the auxiliary magnet 51 is set to be equal to or less than half the radial length of the slit hole 31.

  Also in this figure, the magnetization directions of the permanent magnets 41 and the auxiliary magnets 51 and 52 are indicated by solid arrows, and the tip end side of the arrows represents the N pole and the base end side of the arrows represents the S pole. As indicated by the arrows, each auxiliary magnet 51 is magnetized so that the core magnetic pole Cn side in the circumferential direction is an N pole and the core magnetic pole Cs side is an S pole. The auxiliary magnet 52 provided in the magnetic flux guide hole 43 of the N-pole magnet magnetic pole Mn is magnetized so that the radially outer side becomes the N-pole, and is provided in the magnetic flux guide hole 43 of the S-pole magnet magnetic pole Ms. The auxiliary magnet 52 is magnetized so that the radially outer side is the south pole. The auxiliary magnets 51 and 52 are composed of, for example, a neodymium magnet, a samarium cobalt (SmCo) magnet, an SmFeN-based magnet, a ferrite magnet, an alnico magnet, or the like, and may be any configuration of a sintered magnet and a bonded magnet.

  According to such a configuration, not only the magnetic fluxes of the adjacent magnet magnetic poles Mn and Ms but also the magnetic fluxes of the auxiliary magnets 51 and 52 flow through the core magnetic poles Cn and Cs, so that the magnetic flux flowing through the core magnetic poles Cn and Cs increases. As a result, it is possible to contribute to higher torque of the motor. In this case as well, it is preferable that the magnetic force applied from the rotor 21 to the stator 11 side is weaker at the core magnetic poles Cn and Cs than at the magnetic poles Mn and Ms.

  In the example shown in the figure, the auxiliary magnet 51 is disposed in the slit hole 31 and the auxiliary magnet 52 is disposed in the magnetic flux guiding hole 43. However, one of the auxiliary magnets 51 and 52 may be omitted.

In the above embodiment, the permanent magnet 23 is a sintered magnet, but other than this, for example, a bonded magnet may be used.
In the above embodiment, the rotor 21 is embodied as the inner rotor type motor 10 arranged on the inner peripheral side of the stator 11, but is not particularly limited to this, and the outer rotor type in which the rotor is arranged on the outer peripheral side of the stator It may be embodied in the motor.

  In the above-described embodiment, the radial gap type motor 10 in which the stator 11 and the rotor 21 are opposed in the radial direction is embodied. However, the present invention is not particularly limited thereto, and the stator and the rotor are opposed in the axial direction. You may apply to an axial gap type motor.

  -You may combine embodiment mentioned above and each modification suitably.

  DESCRIPTION OF SYMBOLS 10,30 ... Motor, 11 ... Stator, 12 ... Stator core, 12a ... Teeth, 13 ... Winding, 21 ... Rotor, 22 ... Rotor core, 23, 23a, 41 ... Permanent magnet, 24 ... Rotating shaft, 26 ... Projection, 26a ... Magnetic flux induction recess (magnetic flux induction part), 27, 31, 32 ... Slit hole (magnetic adjustment part), 28, 33, 35, 51, 52 ... Auxiliary magnet (magnetic adjustment part), 42 ... Magnetoresistance hole (magnetic) Adjustment part), 43 ... Magnetic flux induction hole (magnetic flux induction part), 44 ... Magnet accommodation hole, Mn, Ms ... Magnet magnetic pole, Pn, Ps ... Salient magnetic pole (core magnetic pole), Cn, Cs ... Core magnetic pole, U1-U4 ... U phase winding, V1 to V4 ... V phase winding, W1 to W4 ... W phase winding, K1 to K4 ... gap.

Claims (16)

A motor in which a rotor rotates in response to a rotating magnetic field generated by supplying a drive current to a winding of a stator,
The winding includes a first winding and a second winding that are excited at the same timing by the drive current and connected in series.
The rotor magnetic pole of the rotor includes a magnet magnetic pole using a permanent magnet and a core magnetic pole using a part of the rotor core, and the core magnetic pole is at a rotational position of the rotor facing the first winding. Rather than weakening the magnetic force of all the rotor magnetic poles that are configured to face the second winding and that have the same excitation timing and that face the second winding and that face the second winding, A motor characterized in that the magnetic force to the stator side is weakened by using the magnetic pole of the part as the core magnetic pole . The motor according to claim 1,
The windings are each composed of 2n (n is an integer of 2 or more) U-phase windings, V-phase windings, and W-phase windings according to the supplied three-phase driving currents.
A motor characterized in that the number of each of the magnet magnetic pole and the core magnetic pole is n. The motor according to claim 2,
The motor, wherein the magnet magnetic pole and the core magnetic pole are alternately provided at equal intervals in the circumferential direction. The motor according to any one of claims 1 to 3,
The motor, wherein the core magnetic pole is configured to be adjacent to a magnet pole of a different polarity using a permanent magnet in the circumferential direction. The motor according to claim 4,
A motor characterized in that a gap is provided between the core magnetic pole and the magnet pole of the different polarity. The motor according to any one of claims 1 to 5,
The magnet magnetic pole and the core magnetic pole are provided on both the north and south poles of the rotor,
A motor characterized in that the N-pole core magnetic pole and the S-pole core magnetic pole are adjacent to each other in the circumferential direction through a gap. The motor according to any one of claims 1 to 6,
The motor according to claim 1, wherein the rotor core is provided with a magnetic adjustment unit for adjusting a magnetic flux flowing through the rotor core. The motor according to claim 7, wherein
The motor according to claim 1, wherein the magnetic adjustment unit includes an auxiliary magnet embedded in the rotor core and causing a magnetic flux to flow through the core magnetic pole. The motor according to claim 7 or 8,
The core magnetic pole is configured to be adjacent to a magnet pole of a different polarity using a permanent magnet in the circumferential direction,
The magnetic adjusting unit includes a magnetic flux guiding unit that guides the magnetic flux of the magnet magnetic pole to the center side in the circumferential direction of the adjacent core magnetic pole. The motor according to any one of claims 7 to 9,
The magnet magnetic pole and the core magnetic pole are provided on both the north and south poles of the rotor,
The N magnetic pole and the S magnetic pole are adjacent to each other in the circumferential direction, and the S magnetic core is provided on the opposite side of the N magnetic pole from the S magnetic pole. , The N pole core pole is provided on the opposite side of the S pole magnet pole to the N pole magnet pole,
The magnetic adjustment unit is configured to suppress a short circuit of a magnetic flux between the N magnetic pole and the S magnetic pole adjacent in the circumferential direction. The motor according to any one of claims 1 to 10,
The magnet magnetic pole, wherein the permanent magnet is fixed to the outer peripheral surface of the rotor core. The motor according to any one of claims 1 to 10,
The magnet magnetic pole, wherein the permanent magnet is embedded in the rotor core. The motor according to claim 12, when dependent on claim 10.
A motor characterized in that a pair of permanent magnets are provided in each of the N-pole and S-pole magnet magnetic poles so as to form a substantially V-shape extending radially outward as viewed in the axial direction. The motor according to claim 13,
The motor is characterized in that the magnetic adjustment unit is provided radially inward of the permanent magnets in each of the N-pole and S-pole magnet magnetic poles. The motor according to claim 13 or 14,
The rotor core has a plurality of magnet accommodation holes for accommodating the permanent magnets, respectively.
A motor, wherein a gap is provided between a radial end of the magnet housing hole and the permanent magnet housed in the magnet housing hole. The motor according to any one of claims 1 to 15,
A motor characterized in that field-weakening control can be executed.

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