JP3790774B2 - Permanent magnet rotating electric machine and automobile - Google Patents

Description

  The present invention relates to a rotating electric machine and an automobile, and more particularly to a permanent magnet rotating electric machine using a permanent magnet as a magnetic flux generating means, and an automobile using a permanent magnet rotating electric machine.

  Conventionally, a permanent magnet rotating electric machine using a permanent magnet as a magnetic field generating means of a rotor has been used as a kind of rotating electric machine.

  As a conventional permanent magnet rotating electric machine, there is a surface magnet structure, that is, one in which a plurality of permanent magnets are juxtaposed and fixed on the surface of a rotor so that adjacent permanent magnets have opposite polarities in the circumferential direction.

  However, in the case of the surface magnet structure, there is a high possibility that the permanent magnet will be peeled off at a high speed due to centrifugal force. Therefore, the permanent magnet embedded structure in which the permanent magnet is inserted and fixed in the axially extending hole in the rotor is used. A magnet rotor is disclosed in JP-A-5-76146.

  Further, in order to simplify the configuration when skew is applied to a rotor having a permanent magnet embedded structure, an air gap is formed from the end face of each permanent magnet installed in the rotor to the outer periphery of the rotor. -236687.

JP-A-5-76146 JP-A-5-236687

  However, the above-described prior art has a problem that it is impossible to achieve both reluctance torque by the auxiliary magnetic pole and reduction of cogging torque or torque pulsation (hereinafter, both are collectively referred to as “torque pulsation”).

  In a rotor having a permanent magnet embedded structure, a rotor member between adjacent permanent magnets is used as an auxiliary magnetic pole so that the resultant vector of the stator armature magnetomotive force is directed to the rotational direction side from the center position of the auxiliary magnetic pole. By controlling, a reluctance torque can be obtained. This reluctance torque is added to the main torque generated by the permanent magnets, thereby increasing the total torque of the rotating electrical machine and increasing the efficiency.

  On the other hand, a permanent magnet rotating electric machine uses a permanent magnet that always generates a magnetic flux regardless of whether it is energized. Therefore, the rotor always receives a force corresponding to the positional relationship between the permanent magnet and the stator salient pole. When rotating, the force changes pulsatingly. It appears as torque pulsation. This hinders smooth rotation of the rotor and causes a problem that a stable operation cannot be obtained as a rotating electrical machine.

  Since the permanent magnet rotor described in JP-A-5-76146 has an auxiliary magnetic pole, it is possible to obtain a reluctance torque, but the distance between the permanent magnet and the auxiliary magnetic pole is circumferential. Therefore, a sudden change in the magnetic flux density distribution appears and torque pulsation occurs.

  The permanent magnet rotating electrical machine disclosed in Japanese Patent Application Laid-Open No. 5-236687 is provided with a space between the permanent magnets or a space filled with an adhesive filler made of a non-magnetic material. The magnetic flux density distribution change between the adjacent permanent magnets becomes gradual, and cogging torque or torque pulsation hardly occurs. However, since this gap or filler does not serve as an auxiliary magnetic pole, reluctance torque cannot be obtained.

  In view of the above circumstances, an object of the present invention is to provide a permanent magnet rotating electrical machine capable of suppressing torque pulsation while obtaining reluctance torque by an auxiliary magnetic pole, and an automobile using the same.

  The present invention includes a stator and a rotor disposed in the stator via a gap, and the rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core. The rotor core is formed with a plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic air gaps. The auxiliary magnetic pole part is disposed in the rotor core over the entire circumference in the circumferential direction, and the permanent magnet insertion hole is disposed between the auxiliary magnetic pole parts adjacent in the circumferential direction. The permanent magnet is inserted into the rotor core so that polarities of the permanent magnets arranged on both sides in the circumferential direction with the auxiliary magnetic pole in between are opposite to each other. Mounted in the hole and disposed inside the rotor core; The magnetic air gap is formed inside the rotor core and is disposed between the permanent magnet and the auxiliary magnetic pole part, so that the permanent magnet is interposed between the permanent magnet and the auxiliary magnetic pole part. The change in the magnetic flux density distribution is moderated, and the auxiliary magnetic pole portion has a circumferential width greater than a circumferential width of the permanent magnet.

  And a magnetic pole piece for guiding the magnetic flux of the permanent magnet to the stator side, and a bridge portion connecting the magnetic pole piece and the auxiliary magnetic pole, wherein the magnetic pole piece is inserted into the permanent magnet. Formed on the stator side of the hole, and the bridge portion is formed on the rotor core on the stator side of the magnetic gap and magnetically connects between the magnetic pole piece and the auxiliary magnetic pole. The magnetic flux of the permanent magnet leaking from the magnetic pole piece to the auxiliary magnetic pole is suppressed by saturation.

  The permanent magnet insertion hole and the magnetic gap are formed by punching the rotor core in the axial direction.

  The magnetic gap is filled with a nonmagnetic member.

  Further, when the vehicle is in a low-speed operation state, the control device causes the combined vector of the magnetomotive force of the armature by the stator winding to be directed to the rotation direction side of the rotor from the center position of the auxiliary magnetic pole portion. The reluctance torque is generated by being controlled.

  The present invention is also a vehicle-mounted permanent magnet rotating electrical machine that is mounted on a vehicle and whose generated torque is controlled by controlling a resultant vector of magnetomotive force of the armature by a control device, and the stator winding And a rotor disposed in the stator via a gap. The rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core. The rotor core includes a plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic air gaps. The magnetic pole portion is disposed over the entire circumference in the rotor core, and the permanent magnet insertion hole is disposed between the auxiliary magnetic pole portions adjacent in the circumferential direction. The permanent magnet is formed inside the rotor core. The permanent magnets disposed on both sides in the circumferential direction with the auxiliary magnetic poles are disposed in the rotor core so that the permanent magnets are opposite in polarity to each other and are installed in the permanent magnet insertion holes, The magnetic air gap is formed inside the rotor core and is disposed between the permanent magnet and the auxiliary magnetic pole part, so that the permanent magnet is interposed between the permanent magnet and the auxiliary magnetic pole part. The change in the magnetic flux density distribution is moderated, and the auxiliary magnetic pole portion has a circumferential width greater than a circumferential width of the permanent magnet.

  Further, the present invention provides an automobile having a permanent magnet rotating electrical machine and a control device that controls a torque generated by the permanent magnet rotating electrical machine, wherein the permanent magnet rotating electrical machine includes a stator having a stator winding and a stator. A rotor disposed via a gap, and the rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core, and the rotor core includes A plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic gaps are formed, and the plurality of auxiliary magnetic pole portions are formed inside the rotor core. The permanent magnet insertion hole is formed inside the rotor core so as to be disposed between the auxiliary magnetic pole portions adjacent in the circumferential direction. The permanent magnet sandwiches the auxiliary magnetic pole The permanent magnets disposed on both sides in the circumferential direction of the permanent magnet are disposed in the rotor core so that the permanent magnets are opposite in polarity to each other. The magnetic flux density distribution of the permanent magnet between the permanent magnet and the auxiliary magnetic pole portion is moderately changed between the permanent magnet and the auxiliary magnetic pole portion formed inside the rotor core and disposed between the permanent magnet and the auxiliary magnetic pole portion. Further, the auxiliary magnetic pole portion has a width in the circumferential direction larger than a width in the circumferential direction of the permanent magnet, and the control device generates a composite vector of the armature magnetomotive force of the stator winding. The torque generated by the permanent magnet rotating electric machine is controlled by controlling.

  In addition, the present invention can be applied to any of the above-described rotating electric machines of a generator and an electric motor, an inner rotor and an outer rotor, a rotary type and a linear type, a concentrated winding and a distributed winding stator structure.

  All the above inventions can be applied to any shape such as a rectangular parallelepiped, an arc shape, and a trapezoidal shape without depending on the shape of the permanent magnet, and have the same effect.

  According to the present invention, a permanent magnet rotating electric machine with less torque pulsation can be configured.

  According to the present invention, in addition to the above effects, the permanent magnet can be positioned.

  According to the present invention, the magnetic flux passing through the auxiliary magnetic pole can be configured to smoothly circulate around the permanent magnet.

  According to the present invention, it is possible to further suppress the magnetic flux leaking from the permanent magnet to the auxiliary magnetic pole from the member on the stator side of the gap.

  According to the present invention, in addition to the effect of reducing torque pulsation, it is possible to secure a supporting force against the centrifugal force applied to the permanent magnet.

  According to the present invention, it is possible to provide an electric vehicle having a stable driving device with little cogging torque.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a circumferential sectional view of a permanent magnet rotating electrical machine having an inner rotor type concentrated winding stator structure according to an embodiment of the present invention.

  The rotating electric machine is composed of a stator 1 and a rotor 2, which are arranged with a rotation gap as shown in the figure.

  The stator 1 includes a stator core 3 and a stator winding 4, and the stator core 3 further includes a core portion 5 and a stator salient pole portion 6. A magnetic circuit for passing magnetic flux through the stator salient pole portion 6 is formed in the core portion 5, and the stator winding 4 is intensively wound around the stator salient pole portion 6.

  The rotor 2 includes a shaft 7, a rotor core 8, and a permanent magnet 9. In the rotor core 8, a permanent magnet insertion hole 10 for inserting the permanent magnet 9 and a hole through which the shaft 7 passes are punched in the axial direction, and the permanent magnet 9 and the shaft 7 are inserted and fixed, respectively.

  As described above, this embodiment has a so-called permanent magnet embedded structure, and the members between the adjacent permanent magnet insertion holes 10 serve as auxiliary magnetic pole portions 16 by arranging the permanent magnets 9 on the rotor 2 in an annular shape. Can function.

  That is, if the control device (not shown) controls the combined vector of the armature magnetomotive force by the stator winding 4 so as to face the rotation direction side from the center position of the auxiliary magnetic pole, the magnetic flux generated from the stator winding 4 is supplemented. The permanent magnet 9 circulates through the magnetic pole part 16 and reluctance torque is generated. This is particularly effective in a low-speed operation state, and the reluctance torque is added to the normal torque by the permanent magnet 9 so that a high torque can be obtained as an electric motor.

  FIG. 3 shows a sectional structure in the axial direction of the permanent magnet rotating electric machine according to the present embodiment.

  The stator 1 is fixed to the inner peripheral surface of the housing 11 as shown in the figure, and the shaft 7 inserted and fixed to the rotor 2 is a bearing so that the rotor 2 is in contact with the stator 1 in a rotatable manner with a rotation gap. 13 and the end bracket 12 hold the stator 1.

  In the present embodiment, a material having a higher magnetic permeability than the permanent magnet 9, for example, a high magnetic permeability magnetic material such as a silicon steel plate is used as the material of the rotor core 8. Thereby, the eddy current loss which generate | occur | produces inside a magnet can be reduced, and the above-mentioned auxiliary magnetic pole part 16 can be functioned more effectively.

  The present invention can be applied to any of a generator and an electric motor, an inner rotor and an outer rotor, a rotary type and a linear type, a concentrated winding and a distributed winding stator structure, and the same effect can be obtained.

  In the present embodiment, a magnetic gap 14 is provided between the permanent magnet 9 and the auxiliary magnetic pole portion 16 adjacent to the permanent magnet 9 in the circumferential direction.

  FIG. 2 is an enlarged view of the periphery of an arbitrary permanent magnet 9 in FIG. As shown in the figure, a permanent magnet insertion hole 10 is formed so as to provide a gap 14 at the circumferential end of the permanent magnet 9, and the permanent magnet 9 is inserted and fixed therein. This gap extends in the axial direction and is in contact with the permanent magnet 9 and the auxiliary magnetic pole portion 16.

  The operation of the gap 14 will be described with reference to FIGS.

  4 and 5 are views showing a relationship between a circumferential sectional view around the permanent magnet 9 and a magnetic flux density distribution generated from the peripheral surface of the rotor 2 by the permanent magnet 9. FIG. 4 shows a rotor using the above-described embodiment, and FIG. 5 shows a conventional rotor.

  In both cases, the magnetic pole piece 15 of the rotor core 8 functions as a member that transmits the magnetic flux generated by the permanent magnet 9 to the stator 1. Further, a member between adjacent permanent magnet insertion holes 10, that is, the auxiliary magnetic pole portion 16 in the figure functions as an auxiliary magnetic pole that generates reluctance torque.

  The graphs in the upper part of FIGS. 4 and 5 represent the magnetic flux density distribution generated from the stator side surface of the rotor 2 by the permanent magnet 9. In both figures, in the magnetic pole piece portion 15, the magnetic flux generated by the permanent magnet 9 shows a substantially constant magnetic flux density distribution. On the other hand, in the auxiliary magnetic pole portion 16, the magnetic flux generated by the permanent magnet 9 is difficult to be transmitted, and the magnetic flux generated from the stator side surface of the rotor 2 becomes almost zero.

  However, in the conventional rotor, the permanent magnet 9 is disposed so as to fill the entire permanent magnet insertion hole 10 provided in the rotor core 8 as shown in FIG. In the vicinity of the boundary of the portion 16, a sudden change in the magnetic flux density distribution as shown in the figure appears.

  In a permanent magnet rotating electrical machine, the permanent magnet always generates a magnetic flux regardless of whether the rotating electrical machine is energized. Therefore, the rotor always has a positional relationship between the stator salient pole portion 6 and the magnetic pole piece portion 15. Receive the power according to. When the rotor rotates, the force received by the rotor changes in a pulsating manner due to a change in the position of each other, and this appears as cogging torque or torque pulsation. As the change in the magnetic flux density distribution in the circumferential direction of the rotor is more rapid, the torque pulsation becomes more prominent.

  Therefore, the air gap 14 is provided as in the present embodiment to make the change in the magnetic flux density distribution moderate. By the air gap 14, a bridge portion 17 is formed between the auxiliary magnetic pole portion 16 and the magnetic pole piece portion 15 on the rotor surface, and a distance is provided between the magnetic pole piece portion 15 and the auxiliary magnetic pole 16. Therefore, as shown in the graph of FIG. 4, a gentle change in the magnetic flux density distribution appears compared to the conventional case, and cogging torque and torque pulsation can be suppressed.

  In a rotating electrical machine in which the rotation direction is determined in only one direction, the magnetic gap 14 may be provided only at one circumferential end of the permanent magnet 9.

  In the present embodiment, the rectangular parallelepiped permanent magnet 9 as shown in the figure is used, but the same effect can be obtained by forming a similar gap 14 in another shape, for example, an arc shape or a trapezoid shape. .

  6 to 8 show another embodiment of the present invention.

  The embodiment shown in FIGS. 6 and 7 is obtained by changing the shape of the gap 14 in the embodiment shown in FIG.

  In the embodiment of FIG. 6, a recess is provided in the bottom of the permanent magnet insertion hole 10, and the permanent magnet 9 is disposed in the recess. As a result, the thickness of the air gap 14 in the rotor radial direction is smaller than the thickness of the permanent magnet 9 in the rotor radial direction, and the surface on the anti-stator side of the air gap 14 is anti-fixed to the permanent magnet 9 as shown in the figure. It is formed closer to the stator than the child side surface.

  Thus, the permanent magnet 9 can be positioned at a predetermined position of the permanent magnet insertion hole 10.

  For positioning the permanent magnet 9, the same effect can be obtained even if a nonmagnetic material is disposed or filled in the gap 14. For example, the permanent magnet 9 can be more stably disposed by disposing a solid made of a nonmagnetic material in the gap 14 and fixing the solid integrally with a varnish and an adhesive.

  In the embodiment of FIG. 7, the circumferential width of the surface on the stator side of the gap 14 is larger than the circumferential width of the surface on the anti-stator side. In FIG. 7, in particular, the gap 14 is formed so that the circumferential section thereof has a substantially triangular shape. As a result, the magnetic flux passing through the auxiliary magnetic pole portion 16 can smoothly circulate the permanent magnet 9, and more reluctance torque can be obtained.

  Further, in the embodiment of FIGS. 6 and 7, the stator-side surface of the gap 14 is formed so as to be substantially parallel to the stator-side surface of the rotor 2.

  As a result, the magnetic saturation of the bridge portion 17 becomes tight, and the magnetic flux generated from the permanent magnet 9 can be suppressed from leaking to the auxiliary magnetic pole portion 16 via the magnetic pole piece portion 15 and the bridge portion 17.

  In the embodiment of FIG. 8, the shape of the rotor 2 is changed to obtain the same configuration. That is, the bridge portion 17 is configured to extend substantially perpendicular to the inclined surface 14 a of the gap 14. Accordingly, the inclination of the bridge portion 17 with respect to the radial direction of the rotor 2 is increased, and the centrifugal force applied to the magnetic pole piece portion 15 and the permanent magnet 9 can be supported by the tensile force of the bridge portion 17. In general, the durability of the material is higher with respect to the tensile force than with respect to the shearing force, and the durability with respect to the centrifugal force is higher than that of the above-described embodiment in which the bridge portion 17 is substantially perpendicular to the radial direction of the rotor 2. high. Therefore, it is possible to make the bridge portion 17 thinner and increase the amount of effective magnetic flux generated from the permanent magnet 9, and the rotor can be rotated at a higher speed.

  9 to 11 show another embodiment of the present invention.

  In these, a magnetic gap 14 is provided between the magnetic pole piece portion 15 and the auxiliary magnetic pole portion 16, and the gap 14 is formed at both ends of the magnetic pole piece portion 15 as shown in the figure. The gap 14 extends in the axial direction along the circumferential edge of the permanent magnet 9 on the stator side. The gap 14 forms a bridge portion 17 as shown in the figure, and the magnetic flux density distribution in the portion changes gradually, and the cogging torque can be suppressed.

  Further, in FIGS. 9 to 11, the gap 14 is formed so as to be in contact with the circumferential end portion of the surface of the permanent magnet 9 on the stator side and to enter from the circumferential end surface of the permanent magnet 9. In FIG. 10, the gap 14 is formed to extend toward the inside of the permanent magnet 9, and in FIG. 11, the gap 14 is formed to extend in a rectangular shape inside the permanent magnet 9.

  Thereby, the magnetic flux leaking to the auxiliary magnetic pole part 16 is reduced, and the magnetic flux density in the magnetic pole piece part 15 is increased, so that the efficiency of the rotating electrical machine can be increased.

  12 to 14 show another embodiment of the present invention.

  When the rotor having the permanent magnet embedded structure is rotated at a high speed, the centrifugal force received by the permanent magnet is increased, and the burden on the members supporting the permanent magnet, that is, the magnetic pole piece portion 15 and the bridge portion 17 is increased. When the member is provided thick in response to the burden, the distance between the rotor surface and the permanent magnet is increased, and the magnetic flux leaks to the auxiliary magnetic pole portion 16, thereby transmitting the permanent magnet to the stator. The problem is that the magnetic flux generated is reduced and the torque is reduced.

  Accordingly, magnetic gaps 14 extending in the axial direction in the cross section as shown in FIG. 12 are formed at both ends in the circumferential direction of the stator side surface of the permanent magnet 9, and the magnetic pole piece 15 and the auxiliary magnetic pole part so as to sandwich the gap 14. A pole piece support member 18 is inserted into and fixed to 16 in the axial direction. FIG. 13 shows an example of the pole piece support member 18, which is a U-shaped nonmagnetic resin. FIG. 14 is a sectional view in the axial direction of a permanent magnet rotating electric machine having the rotor 2 in which the pole piece support member 18 is inserted from both sides of the rotor core 8.

  Here, the gap 14 suppresses magnetic flux leaking from the magnetic pole piece 15 to the auxiliary magnetic pole 16. The magnetic pole piece support member 18 serves as a medium for supporting the centrifugal force of the permanent magnet 9 and the magnetic pole piece portion 15 itself applied to the magnetic pole piece portion 15 with the auxiliary magnetic pole portion 16.

  Thereby, the supporting force of the permanent magnet against the centrifugal force can be increased.

  Further, by cutting the bridge portion 17 in FIG. 12 after the assembly of the rotor 2, the magnetic flux leakage due to the bridge portion 17 can be reduced while maintaining the support force of the magnetic pole piece portion 15 by the magnetic pole piece support member 18. it can.

  FIG. 15 shows another embodiment of the present invention.

  Here, a permanent magnet in which a magnetic gap 14 is formed between the magnetic pole piece portion 15 and the auxiliary magnetic pole portion 16 as shown in the figure, and a magnetic material and a nonmagnetic material are combined between the permanent magnet 9 and the magnetic pole piece portion 15. A support member 19 is provided.

  The permanent magnet support member 19 is a combination of a magnetic material 19a and a nonmagnetic material 19b as shown in the figure, and the two are joined together by welding, for example. The magnetic material 19a is made of a magnetic material in order to transmit the magnetic flux generated by the permanent magnet 9 to the magnetic pole piece 15, and the nonmagnetic material 19b is used to suppress the leakage magnetic flux from the permanent magnet 9 to the auxiliary magnetic pole part 16. It is made of a non-magnetic material.

  With the above configuration, the centrifugal force applied to the permanent magnet 9 can be supported by the auxiliary magnetic pole portion 16 via the permanent magnet support member 19, and only the centrifugal force of the magnetic pole piece portion 15 is applied to the bridge portion 17. Therefore, the length of the bridge portion 17 in the radial direction can be shortened, and accordingly, leakage of magnetic flux from the permanent magnet 9 can be reduced.

  Alternatively, in the embodiment shown in FIGS. 9 to 11, it is also effective to dispose or fill the gap 14 with a nonmagnetic material.

  The thickness of the pole piece 15 is set to a thickness necessary for obtaining a sufficient magnetic flux, and the air gap 14 is punched in the shape of the permanent magnet 9 on the stator side as shown in FIGS. The material is filled with, for example, an adhesive or varnish. Thus, the centrifugal force received by the permanent magnet 9 and the magnetic pole piece 15 can be supported by the gap 14 without increasing the thickness of the magnetic pole piece 15 in the radial direction.

  Also, a resin magnet can be used as the material of the permanent magnet 9. In this case, a resin magnet can be fitted in a shape in which the permanent magnet insertion hole 10 and the gap 14 are combined instead of the nonmagnetic material filling the gap 14. That is, the plastic magnet itself can serve as the above-described role of the gap 14.

  Furthermore, it is also effective to provide the auxiliary magnetic pole portion 16 with a larger circumferential width than the permanent magnet 9 as shown in FIG.

  As a result, the weight of the permanent magnet 9 that creates the centrifugal force applied to the bridge portion 17 is reduced, the thickness of the bridge portion 17 can be further reduced, and the magnetic flux leaking from the magnetic pole piece portion 15 to the auxiliary magnetic pole portion 16 can be reduced. Can be reduced.

  Note that the magnetic flux generated from the permanent magnet 9 decreases as the circumferential width of the permanent magnet 9 decreases, but the reluctance torque by the auxiliary magnetic pole portion 16 relatively increases. This is effective in the case where an expensive neodymium magnet is used as the permanent magnet 9, and the cost reduction due to the reduction in the amount of the permanent magnet 9 is compensated by the reluctance torque of the auxiliary magnetic pole portion 16, thereby reducing the cost performance. It is possible to improve.

  If the permanent magnet rotating electrical machine described above is applied to an electric vehicle, particularly an electric vehicle, a stable permanent magnet rotating electrical machine drive device that has a low cogging torque and can be started smoothly can be mounted, and an Cars can be provided.

1 is a circumferential cross-sectional view of a permanent magnet rotating electric machine that constitutes an embodiment of the present invention. FIG. 2 is an enlarged view around an arbitrary permanent magnet of the rotor of FIG. 1. FIG. 2 is an axial sectional view of the embodiment of FIG. 1. Functional explanatory drawing and magnetic flux density distribution of the rotor member of FIG. Functional explanatory drawing and magnetic flux density distribution of a rotor member of a conventional permanent magnet rotating electric machine. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. FIG. 13 is a perspective view of the pole piece support member of FIG. 12. FIG. 13 is an axial sectional view of the permanent magnet rotating electric machine of FIG. 12. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention. The circumferential direction sectional drawing of the rotor of the permanent magnet rotary electric machine which makes other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Rotor, 3 ... Stator core, 4 ... Stator winding, 5 ... Core part, 6 ... Stator pole part, 7 ... Shaft, 8 ... Rotor core, 9 ... Permanent magnet DESCRIPTION OF SYMBOLS 10 ... Permanent magnet insertion hole, 11 ... Housing, 12 ... End bracket, 13 ... Bearing, 14 ... Air gap, 15 ... Magnetic pole piece part, 16 ... Auxiliary magnetic pole part, 17 ... Bridge part, 18 ... Magnetic pole piece support member, 19 ... Permanent magnet support member.

Claims (14)

A stator, and a rotor disposed in the stator via a gap,
The rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core;
In the rotor core, a plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic gaps are formed,
The plurality of auxiliary magnetic pole portions are arranged over the entire circumference in the circumferential direction inside the rotor core,
The permanent magnet insertion hole is formed inside the rotor core so as to be disposed between the auxiliary magnetic pole portions adjacent in the circumferential direction,
The permanent magnet is mounted in the permanent magnet insertion hole and disposed inside the rotor core so that the polarities of the permanent magnets arranged on both sides in the circumferential direction with the auxiliary magnetic pole in between are opposite to each other. Has been
The magnetic air gap is formed inside the rotor core and is disposed between the permanent magnet and the auxiliary magnetic pole part, so that the permanent magnet is interposed between the permanent magnet and the auxiliary magnetic pole part. It makes the change of magnetic flux density distribution moderate,
Further, the auxiliary magnetic pole part has a circumferential width greater than a circumferential width of the permanent magnet. In the permanent magnet rotating electric machine according to claim 1,
A magnetic pole piece portion for guiding the magnetic flux of the permanent magnet to the stator side, and a bridge portion connecting the magnetic pole piece portion and the auxiliary magnetic pole portion,
The magnetic pole piece is formed on the stator side of the permanent magnet insertion hole,
The bridge portion is formed in the rotor core on the stator side of the magnetic gap, and magnetically saturates between the magnetic pole piece and the auxiliary magnetic pole so that the magnetic pole piece changes to the auxiliary magnetic pole. A permanent magnet rotating electrical machine that suppresses magnetic flux of the permanent magnet that leaks. In the permanent magnet rotating electric machine according to claim 1,
The permanent magnet rotating electrical machine, wherein the permanent magnet insertion hole and the magnetic gap are formed by punching the rotor core in the axial direction. In the permanent magnet rotating electric machine according to claim 1,
A permanent magnet rotating electric machine, wherein the magnetic gap is filled with a nonmagnetic member. An on-vehicle permanent magnet rotating electric machine that is mounted on a vehicle and whose generated torque is controlled by controlling a combined vector of magnetomotive forces of armatures by a control device,
A stator having a stator winding, and a rotor disposed in the stator via a gap;
The rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core;
In the rotor core, a plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic gaps are formed,
The plurality of auxiliary magnetic pole portions are arranged over the entire circumference in the circumferential direction inside the rotor core,
The permanent magnet insertion hole is formed inside the rotor core so as to be disposed between the auxiliary magnetic pole portions adjacent in the circumferential direction,
The permanent magnet is mounted in the permanent magnet insertion hole and disposed inside the rotor core so that the polarities of the permanent magnets arranged on both sides in the circumferential direction with the auxiliary magnetic pole in between are opposite to each other. Has been
The magnetic air gap is formed inside the rotor core and is disposed between the permanent magnet and the auxiliary magnetic pole part, so that the permanent magnet is interposed between the permanent magnet and the auxiliary magnetic pole part. It makes the change of magnetic flux density distribution moderate,
Further, the auxiliary magnetic pole part has a circumferential width greater than a circumferential width of the permanent magnet. The permanent magnet rotating electric machine according to claim 5,
A magnetic pole piece portion for guiding the magnetic flux of the permanent magnet to the stator side, and a bridge portion connecting the magnetic pole piece portion and the auxiliary magnetic pole portion,
The magnetic pole piece is formed on the stator side of the permanent magnet insertion hole,
The bridge portion is formed in the rotor core on the stator side of the magnetic gap, and magnetically saturates between the magnetic pole piece and the auxiliary magnetic pole so that the magnetic pole piece changes to the auxiliary magnetic pole. A permanent magnet rotating electrical machine that suppresses magnetic flux of the permanent magnet that leaks. The permanent magnet rotating electric machine according to claim 5,
The permanent magnet rotating electrical machine, wherein the permanent magnet insertion hole and the magnetic gap are formed by punching the rotor core in the axial direction. The permanent magnet rotating electric machine according to claim 5,
A permanent magnet rotating electric machine, wherein the magnetic gap is filled with a nonmagnetic member. The permanent magnet rotating electric machine according to claim 5,
When the vehicle is in a low-speed operation state, the control device controls the resultant vector of the magnetomotive force of the armature by the stator winding so that it is directed toward the rotation direction of the rotor with respect to the center position of the auxiliary magnetic pole part. Thus, the reluctance torque is generated, and the on-vehicle permanent magnet rotating electric machine is characterized. Permanent magnet rotating electrical machine In an automobile having a control device for controlling torque generated by the permanent magnet rotating electrical machine,
The permanent magnet rotating electrical machine has a stator having a stator winding, and a rotor disposed in the stator via a gap,
The rotor includes a rotor core and a plurality of permanent magnets provided inside the rotor core;
In the rotor core, a plurality of permanent magnet insertion holes, a plurality of auxiliary magnetic pole portions for generating reluctance torque, and a plurality of magnetic gaps are formed,
The plurality of auxiliary magnetic pole portions are arranged over the entire circumference in the circumferential direction inside the rotor core,
The permanent magnet insertion hole is formed inside the rotor core so as to be disposed between the auxiliary magnetic pole portions adjacent in the circumferential direction,
The permanent magnet is mounted in the permanent magnet insertion hole and disposed inside the rotor core so that the polarities of the permanent magnets arranged on both sides in the circumferential direction with the auxiliary magnetic pole in between are opposite to each other. Has been
The magnetic air gap is formed inside the rotor core and is disposed between the permanent magnet and the auxiliary magnetic pole part, so that the permanent magnet is interposed between the permanent magnet and the auxiliary magnetic pole part. It makes the change of magnetic flux density distribution moderate,
Further, the auxiliary magnetic pole portion has a width in the circumferential direction larger than a width in the circumferential direction of the permanent magnet,
The vehicle according to claim 1, wherein the control device controls a torque generated by the permanent magnet rotating electric machine by controlling a combined vector of armature magnetomotive forces of the stator windings. The automobile according to claim 10,
The permanent magnet rotating electrical machine further includes a magnetic pole piece portion for guiding the magnetic flux of the permanent magnet to the stator side, and a bridge portion that connects the magnetic pole piece portion and the auxiliary magnetic pole portion,
The magnetic pole piece is formed on the stator side of the permanent magnet insertion hole,
The bridge portion is formed in the rotor core on the stator side of the magnetic gap, and magnetically saturates between the magnetic pole piece and the auxiliary magnetic pole so that the magnetic pole piece changes to the auxiliary magnetic pole. An automobile characterized in that the magnetic flux of the permanent magnet that leaks is suppressed. The automobile according to claim 10,
The permanent magnet insertion hole and the magnetic gap are formed by punching the rotor core in the axial direction. The automobile according to claim 10,
An automobile characterized in that the magnetic gap is filled with a nonmagnetic member. The automobile according to claim 5,
When the automobile is in a low-speed operation state, the control device controls the resultant vector of the magnetomotive force of the armature by the stator winding so as to face the rotation direction side of the rotor from the center position of the auxiliary magnetic pole part, An automobile characterized in that the reluctance torque is generated in the permanent magnet rotating electric machine.

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