JP5128387B2 - Embedded magnet type motor - Google Patents

Description

  The present invention relates to an interior magnet type motor.

2. Description of the Related Art Conventionally, an embedded magnet type motor includes a rotor in which a plurality of housing holes penetrating in the axial direction are formed in the rotor core in the circumferential direction, and a magnet is disposed in each housing hole.
An example of such an embedded magnet type motor is disclosed in Patent Document 1. The housing hole of the rotor core in this embedded magnet type motor has a radial housing hole extending substantially in the radial direction and a substantially V-shaped housing hole protruding outward in the radial direction. Thus, P / 2 pieces are formed, and they are alternately formed in the circumferential direction. The magnets are arranged in the radial accommodation holes and in the magnet accommodation portions corresponding to the straight lines forming the V-shape of the V-shaped accommodation holes. In this embedded magnet type motor, one magnet is constituted by a magnet disposed in the radial accommodation hole and a magnet disposed in the magnet accommodation portion adjacent to one of the circumferential directions. A different magnetic pole is constituted by the magnet disposed in the radial accommodation hole and the magnet disposed in the magnet accommodation portion adjacent to the other in the circumferential direction.
JP 2007-195391 A

  However, in the rotor core of the embedded magnet type motor as described above, the magnet formed on the radially inner side between the magnet housing portion and the radial housing hole and moves inward in the radial direction of the magnet disposed in the magnet housing portion. Since the inner bridge portion that is uniform in the axial direction to be regulated becomes a magnetic path with a small magnetic resistance, there is a problem that there is a large amount of leakage magnetic flux in the portion. This causes the effective magnetic flux in the embedded magnet type motor to be reduced and hinders the increase in torque.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an embedded magnet type motor that can reduce leakage magnetic flux.

  In the first aspect of the invention, the core sheet is laminated in the axial direction and has a rotor core in which a plurality of receiving holes penetrating in the axial direction are formed in the circumferential direction, and the accommodation is performed so that the number of magnetic poles becomes P poles. An embedded magnet type motor having a rotor in which a magnet is disposed in a hole, wherein the accommodation hole has a radial accommodation hole extending in a substantially radial direction, and a substantially V-shape projecting radially outward. Each of the V-shaped receiving holes is formed in P / 2 pieces and alternately formed in the circumferential direction, and the magnet is disposed in the radial receiving hole and the V-shaped receiving hole is formed. In each of the magnet housing portions corresponding to each straight line forming the V-shape of the hole, the magnet disposed in the radial housing hole, and in the magnet housing portion adjacent to one of the circumferential directions thereof One magnetic pole is constituted by the magnet disposed, and the diameter A different magnetic pole is constituted by the magnet disposed in the direction accommodating hole and the magnet disposed in the magnet accommodating portion adjacent to the other in the circumferential direction, and the core sheet P / 2 pre-lamination radial accommodation holes corresponding to the radial accommodation holes in the communication hole communicated with the pre-lamination magnet accommodation portions corresponding to the magnet accommodation portions adjacent to each other in the circumferential direction on the radially inner side, The rotor core has an independent hole in which an inner bridge portion is formed between the pre-lamination magnet housing portion and the pre-lamination magnet housing portion. The core sheet is laminated so that the independent holes are arranged in a part of the axial direction, and the magnets arranged in the magnet housing part are restricted from moving radially inward by the inner bridge part. Become.

  According to this configuration, the independent hole is arranged in a part of the radial accommodation hole in the axial direction, and each magnet arranged in the magnet accommodation portion is restricted from moving inward in the radial direction by the inner bridge portion. In the portion where the communication hole of the radial accommodation hole is arranged (the inner bridge portion is not formed), the movement of the magnet arranged in the magnet accommodation portion is not restricted in the radial inner direction, but the radial accommodation is performed on the radial inner side. Since a gap is formed between the magnet in the hole and the magnet in the magnet housing portion, the magnetic resistance at the portion increases, and the leakage magnetic flux can be reduced. In addition, it is easy to form the communication hole and the independent hole in the core sheet by, for example, punching processing (for example, as compared with the case of forming a small protrusion for restricting the movement of the magnet inward in the radial direction). Therefore, the manufacture becomes easy, and for example, the magnet can be lengthened correspondingly. Moreover, since the inner bridge part is connected along a radial direction to a large portion (a part of the core sheet) disposed on the inner side and the outer side in the radial direction (for example, restricting movement of the magnet inward in the radial direction). Therefore, the strength can be increased even if it is thin in the direction in which the movement of the magnet is restricted (compared to the case where a small protrusion is formed).

According to a second aspect of the present invention, in the embedded magnet type motor according to the first aspect, only one independent hole is formed in the core sheet.
According to this configuration, since the core sheet has one independent hole that reduces the magnetic resistance (the inner bridge portion will be formed), the overall magnetic resistance is the largest, and the leakage flux is the highest. Can be reduced.

  According to a third aspect of the present invention, there is provided a rotor core in which core sheets are laminated in the axial direction and a plurality of receiving holes penetrating in the axial direction are formed in the circumferential direction, and the accommodation is performed so that the number of magnetic poles becomes P poles. An embedded magnet type motor having a rotor in which a magnet is disposed in a hole, wherein the accommodation hole has a radial accommodation hole extending in a substantially radial direction, and a substantially V-shape projecting radially outward. Each of the V-shaped receiving holes is formed in P / 2 pieces and alternately formed in the circumferential direction, and the magnet is disposed in the radial receiving hole and the V-shaped receiving hole is formed. In each of the magnet housing portions corresponding to each straight line forming the V-shape of the hole, the magnet disposed in the radial housing hole, and in the magnet housing portion adjacent to one of the circumferential directions thereof One magnetic pole is constituted by the magnet disposed, and the diameter The magnet disposed in the direction accommodating hole and the magnet disposed in the magnet accommodating portion adjacent to the other in the circumferential direction constitute one magnetic pole, and at least one magnetic pole is formed. P / 2 pre-lamination radial accommodation holes corresponding to the radial accommodation holes in the core sheet of the core sheet are two pre-lamination magnet accommodations corresponding to the two magnet accommodation portions adjacent in the circumferential direction on the radial inner side. One side communication hole that communicates with one of the parts and does not communicate with one but forms one inner bridge part between the magnet housing parts before lamination, and the rotor core includes The core sheet is laminated so that the one-side communication hole is disposed in at least a part of the radial accommodation hole in the axial direction.

  According to the same configuration, the one-side communication hole is disposed in at least a part of the radial direction accommodation hole in the axial direction. Therefore, in the portion (at least part of the axial direction) where the one-side communication hole of the radial accommodation hole is arranged, the inner side of the magnet arranged in one of the two magnet accommodation portions adjacent in the circumferential direction Although the movement is not restricted, a gap is formed between the magnet in the radial accommodation hole and the magnet in the magnet accommodation portion on the radially inner side, so that the magnetic resistance in the portion is increased, and the leakage magnetic flux can be reduced. it can. In addition, since it is easy to form a one-side communication hole in the core sheet, for example, by punching or the like (for example, compared to the case of forming a small protrusion for restricting the movement of the magnet inward in the radial direction), The manufacture becomes easy, and for example, the magnet can be lengthened accordingly. Moreover, since the inner bridge part is connected along a radial direction to a large portion (a part of the core sheet) arranged on the inner side and the outer side in the radial direction (for example, restricting the movement of the magnet inward in the radial direction). Therefore, the strength can be increased even if it is thin in the direction in which the movement of the magnet is restricted (compared to the case where a small protrusion is formed).

  According to a fourth aspect of the present invention, in the interior magnet type motor according to the third aspect, all of the pre-lamination radial direction accommodation holes are the one-side communication holes, and the one-side communication hole is a circumferential one side. The one-side communication hole communicating with the pre-stacking magnet housing portion and the other one-side communication hole communicating with the other pre-stacking magnet housing portion in the circumferential direction, and the rotor core is formed in each radial housing hole. The core sheet is laminated such that one side communication hole and the other side communication hole are arranged.

  According to this configuration, the one-side communication hole and the other-side communication hole are arranged in each radial accommodation hole, so that the radial accommodation holes are arranged in two magnet accommodation portions adjacent in the circumferential direction on the radial inner side. Each magnet is restricted from moving radially inward at the inner bridge portion. Since all of the pre-lamination radial direction accommodation holes are one-side communication holes, for example, some of the pre-lamination radial direction accommodation holes reduce the magnetic resistance (inner bridge portions are formed in both circumferential directions). As compared with the case of using independent holes, the magnetic resistance is increased, and the leakage magnetic flux can be reduced.

  The invention according to claim 5 has a rotor core in which core sheets are laminated in the axial direction and a plurality of receiving holes penetrating in the axial direction are formed in the circumferential direction, and the accommodation is performed so that the number of magnetic poles becomes P poles. An embedded magnet type motor having a rotor in which a magnet is disposed in a hole, wherein the accommodation hole has a radial accommodation hole extending in a substantially radial direction, and a substantially V-shape projecting radially outward. Each of the V-shaped receiving holes is formed in P / 2 pieces and alternately formed in the circumferential direction, and the magnet is disposed in the radial receiving hole and the V-shaped receiving hole is formed. In each of the magnet housing portions corresponding to each straight line forming the V-shape of the hole, the magnet disposed in the radial housing hole, and in the magnet housing portion adjacent to one of the circumferential directions thereof One magnetic pole is constituted by the magnet disposed, and the diameter The magnet disposed in the direction accommodating hole and the magnet disposed in the magnet accommodating portion adjacent to the other in the circumferential direction constitute one magnetic pole, and at least one magnetic pole is formed. P / 2 pre-stacking radial accommodation holes corresponding to the radial accommodation holes in the core sheet of the core sheet communicate with the pre-lamination magnet housing parts corresponding to the magnet housing parts adjacent in the circumferential direction on the radial inner side. In addition, at a position not to contact the magnet disposed in the radial accommodation hole at the radially inner end, in order to restrict the movement of the magnet disposed in the radial accommodation hole inward in the radial direction. The rotor core has a projecting communication hole formed with a restricting protrusion protruding outward in the radial direction so as to restrict the movement of the magnet disposed in the magnet inward in the radial direction. At least in the axial direction of the direction receiving hole Wherein said core sheet to protrude through hole is arranged are stacked in part.

  According to this configuration, the protruding communication hole in which the restricting protruding portion is formed is disposed at least in a part of the radial direction receiving hole in the axial direction. Therefore, since the inner bridge portion is not formed in the portion (at least a portion in the axial direction) where the protruding communication hole of the radial accommodation hole is disposed, the movement of each magnet is restricted, but the magnetic resistance in the portion is large. Thus, the leakage magnetic flux can be reduced. In addition, since it is easy to form a projecting communication hole in the core sheet, for example, by punching or the like (for example, compared to a case where a small projecting portion for restricting movement of the magnet inward in the radial direction) is formed, Its manufacture is facilitated.

  According to a sixth aspect of the present invention, in the embedded magnet type motor according to the fifth aspect, only one of the protruding communication holes is formed in the core sheet, and the other pre-stacking radial accommodation holes have a diameter of It is a communication hole that communicates with the pre-lamination magnet housing portion that is adjacent in the circumferential direction on the inner side in the direction and in which the portion of the restriction projecting portion is a gap.

  According to the same configuration, the pre-stacking radial accommodation hole other than one projecting communication hole is a communication hole in which a portion of the restriction projecting portion is a gap, and a portion in which the communication hole of the radial housing hole is disposed. Although the movement of each magnet inward in the radial direction is not restricted, the magnetic resistance at that portion increases in the gap. (Compared with the case where two or more protruding communication holes are used or the communication holes are independent holes, etc. E) Leakage magnetic flux can be further reduced.

  According to the present invention, it is possible to provide an embedded magnet type motor that can reduce leakage magnetic flux.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the embedded magnet type motor includes a stator 1 and a rotor 2.
The stator 1 is formed in a substantially cylindrical shape as a whole, and has a plurality of teeth 4 formed so as to extend from the inner peripheral surface of the cylindrical portion 3 forming the outer shape toward the axial center at equal circumferential intervals. The stator core 5 is provided with a winding 6 (only part of which is shown by a two-dot chain line in FIG. 1) wound around each tooth 4 by concentrated winding via an insulator (not shown). In the present embodiment, twelve teeth 4 are formed.

  The rotor 2 includes a rotating shaft 7, a rotor core 8 fixed to the rotating shaft 7, and magnets disposed in accommodation holes (radial accommodation holes 8 a and V-shaped accommodation holes 8 b) formed in the rotor core 8. 9 and 10. Note that the number of magnetic poles in the rotor 2 is P poles and is set to 8 poles in the present embodiment.

  The rotor core 8 is formed in a substantially cylindrical shape by laminating core sheets 11 (see FIG. 2) in the axial direction (see FIG. 3), and the rotation shaft 7 is fitted in the center hole thereof, and the rotor core 8 is placed inside the stator 1. It is rotatably supported. In addition, the housing hole that penetrates in the axial direction to accommodate the magnets 9 and 10 in the rotor core 8 includes a radial housing hole 8a that extends in the radial direction and a substantially V-shaped V-shaped housing that protrudes radially outward. The number of the holes 8b is P / 2, and in the present embodiment, four (8/2 =) are formed, and they are alternately formed in the circumferential direction at equal angular intervals.

  At the radially outer end of the radial accommodation hole 8a, the width seen in the axial direction (in the direction perpendicular to the radial direction) is another part (the width of the magnet 9 disposed in the radial accommodation hole 8a). The larger portion 8c set larger is formed in the entire axial direction (so as to penetrate). Further, on the radially inner side of the large portion 8c on the radially outer side of the radial housing hole 8a, a width viewed in the axial direction (in a direction orthogonal to the radial direction) is set to restrict the movement of the magnet 9 to the radially outer side. An outer protrusion 8d (see FIG. 3) that protrudes in the radial direction so as to be smaller than the other portions is uniformly formed in the axial direction. The outer protrusions 8d are formed as a pair protruding from both sides in the circumferential direction by the same amount (an amount that does not contact each other).

  The V-shaped accommodation hole 8b includes a pair of magnet housing portions 8e corresponding to two straight lines forming the V-shape. The pair of magnet housing portions 8e of the present embodiment are formed as independent holes (through in the axial direction) so that the distance in the circumferential direction is closer toward the outer side in the radial direction but the outer end portions in the radial direction are not communicated with each other. ing. A V-shaped air gap 8f in which the magnet 10 is not disposed is formed at the radially outer end of the V-shaped receiving hole 8b, that is, at the radially outer end of each magnet receiving portion 8e. The V-shaped side gap 8f of the present embodiment is formed so that the width viewed from the axial direction is substantially the same as other portions (portions that accommodate the magnet 10). In addition, the width seen from the axial direction to restrict the movement of the magnet 10 to the radially outer side (V-shaped side gap 8f) is located on the radially inner side of the V-shaped side gap 8f on the radially outer side of the magnet housing portion 8e. A protruding portion 8g protruding so as to be smaller than the other portions is formed. The protruding portions 8g are formed so as to protrude by the same amount from the opposing sides of the pair of magnet housing portions 8e to the separated sides.

  In addition, the radially inner end of the magnet housing portion 8e in the present embodiment is orthogonal to the radial direction on the side portion of the radial housing hole 8a, more specifically on the radially inner side of the radial housing hole 8a, as viewed from the axial direction. It is formed to face the side (inner wall surface) that faces the direction. And the inner side bridge | bridging part 8h formed between the radial direction inner side of the magnet accommodating part 8e and the radial direction accommodation hole 8a is formed in a part of axial direction (every 3 sheets of the core sheet | seat 11). (See FIG. 3). Further, the width of the inner bridge portion 8h in the present embodiment as viewed from the axial direction is formed to be constant along the radial direction. In addition, this is implement | achieved by extending substantially triangular-shaped extension part 8i (the magnet 10 is not arrange | positioned) seeing from an axial direction at the radial direction inner side edge part of the magnet accommodating part 8e. The rotor core 8 having the above-described shape has an outer bridge portion 8j formed between the radially outer side (large portion 8c) of the radial accommodating hole 8a and the outer peripheral surface of the rotor core 8, and the radially outer side of the magnet accommodating portion 8e. The outer bridge portion 8k is formed between the (V-shaped air gap 8f) and the outer peripheral surface of the rotor core 8. In addition, the rotor core 8 having the above-described shape is formed with an inter-accommodating portion bridge portion 8l extending radially outward (connected to the outer bridge portion 8k) between the pair of magnet accommodating portions 8e.

  Here, as shown in FIG. 2, the P / 2 pre-stacking radial accommodation holes corresponding to the radial accommodation holes 8a in the core sheet 11 constituting the rotor core 8 described above are arranged radially in the circumferential direction. The inner bridge portion 8h between the communication hole 11b communicating with the pre-lamination magnet housing portion 11a corresponding to the adjacent magnet housing portion 8e and the pre-lamination magnet housing portion 11a without communicating with the pre-lamination magnet housing portion 11a. Are formed with independent holes 11c. In the present embodiment, only one independent hole 11 c is formed in the core sheet 11. In other words, in the present embodiment, three communication holes 11 b are formed in the core sheet 11.

  In the rotor core 8 of the present embodiment, the core sheet 11 is 360 ° / (P / 2) one by one around the shaft center, and in this embodiment, a large number of the core sheets 11 are laminated while being rotated by 90 °. Become.

Then, substantially rectangular parallelepiped magnets 9 and 10 are disposed in the radial accommodation hole 8a and the magnet accommodation portion 8e, respectively.
In the rotor 2 configured as described above, the magnet 9 is disposed in the radial accommodation hole 8a and the magnet accommodation portion 8e adjacent to one of the circumferential directions (clockwise direction in FIG. 1). The magnet 10 provided constitutes one magnetic pole (for example, S pole), and the magnet 9 disposed in the radial accommodation hole 8a and the other circumferential direction (in FIG. 1, counterclockwise direction). ) Adjacent to the magnet 10 disposed in the magnet housing portion 8e, one magnetic pole (for example, N pole) is configured.

Next, characteristic effects of the above embodiment will be described below.
(1) An independent hole 11c is arranged in a part of the radial accommodation hole 8a in the axial direction, and movement of the magnets 10 arranged in the magnet accommodation portion 8e inward in the radial direction is restricted by the inner bridge portion 8h. The In the portion where the communication hole 11b of the radial accommodation hole 8a is arranged (the inner bridge portion 8h is not formed), the diameter of the magnet 10 arranged in the magnet accommodation portion 8e is not restricted from moving inward in the radial direction. Since a gap is formed between the magnet 9 in the radial accommodation hole 8a and the magnet 10 in the magnet accommodation portion 8e on the inner side in the direction, the magnetic resistance in the portion increases, and the leakage magnetic flux can be reduced. . It is to be noted that the communication hole 11b and the independent hole 11c are formed in the core sheet 11 by punching or the like (for example, as compared with the case where a small protrusion for restricting the movement of the magnet 10 in the radial direction is formed). The manufacturing is easy. Further, since the inner bridge portion 8h is connected along a radial direction to a large portion (a part of the core sheet 11) arranged on the inner side and the outer side in the radial direction (for example, movement of the magnet 10 to the inner side in the radial direction). The strength of the magnet 10 is strong even if it is thin in the direction in which the movement of the magnet 10 is restricted (as compared to the case where a small protrusion is formed to restrict the movement of the magnet 10).

  (2) The magnetic resistance is reduced (the inner bridge portion 8h is formed). Since the number of the independent holes 11c is one in the core sheet 11, the whole is (compared to the case where the number is two or more). The magnetic resistance becomes the largest and the leakage flux can be reduced most.

  (3) The rotor core 8 is formed by laminating a large number of core sheets 11 while being rotated 360 ° / (P / 2) one by one around the axis center in the present embodiment. If it does in this way, since the operation | movement of laminating | stacking while rotating the core sheet 11 360 degree / (P / 2) is constant, it can manufacture easily, for example, automation becomes easy. Further, when a large number of core sheets 11 are laminated, the independent holes 11c and the inner bridge portions 8h are regularly present in the axial direction (in the present embodiment, every three core sheets 11) and radially inward of the magnet 10. Is regularly regulated in the axial direction, the magnet 10 can be supported in a well-balanced manner.

(4) Since the inner bridge portion 8h has a constant width along the radial direction as viewed from the axial direction, and can be made evenly narrow, the leakage magnetic flux can be further reduced.
(5) A pair of magnet housing portions 8e corresponding to each straight line forming the V-shape of the V-shaped housing hole 8b are independently formed, so that the radial direction is radially outward between the pair of magnet housing portions 8e. An inter-accommodating portion bridge portion 81 extending in the direction is formed. As a result, the outer bridge portion 8k formed between the magnet accommodating portion 8e and the outer peripheral surface of the rotor core 8 is connected to the inter-accommodating portion bridging portion 8l, and thus (having a top portion for communicating the magnet accommodating portions 8e ( The strength of the rotor core 8 is increased and its deformation is prevented compared to the case where the inter-housing bridge portion 8l is not formed). In particular, in the core sheet 11 alone, when the pre-lamination magnet accommodating portions 11a communicate with each other (having a communicating top portion), the radially inner portion and the radially outer portion are formed with independent holes 11c. Since it is connected only by the inner bridge portion 8h of the portion to be formed, its rigidity is low and it may be difficult to handle, but compared with this, the strength of the core sheet 11 is increased, its deformation is prevented, and handling is easy It becomes.

The above embodiment may be modified as follows.
In the above embodiment, only one independent hole 11c (where the inner bridge portion 8h is to be formed) is formed in the core sheet 11. However, the present invention is not limited to this. Two or more holes 11c may be formed. In this case, the number of communication holes 11b formed in the core sheet 11 is the number obtained by subtracting the number of independent holes 11c from (P / 2). In this case, it is desirable to arrange the independent holes 11c (that is, the inner bridge portion 8h) so as to be periodically present in the axial direction in the rotor core.

  For example, when two independent holes 11c and two communication holes 11b are continuously formed in the circumferential direction, the core sheet is 180 ° so that the independent holes 11c (inner bridge portions 8h) periodically exist in the axial direction in the rotor core. A large number of sheets may be stacked while being rotated by one degree, or a plurality of core sheets may be stacked while being reversed one by one. Of course, the independent holes 11c (inner bridge portion 8h) may be arranged in the rotor core so as to exist irregularly in the axial direction including the above-described embodiment.

  In the above-described embodiment, the pre-lamination radial accommodation hole in the core sheet 11 includes the communication hole 11b communicated with the pre-lamination magnet accommodation portion 11a corresponding to the magnet accommodation portion 8e adjacent in the circumferential direction on the radially inner side, and the lamination The inner bridge portion 8h is formed in the axial direction of the rotor core 8 although it does not communicate with the front magnet housing portion 11a and is formed with the independent hole 11c in which the inner bridge portion 8h is formed between the front magnet housing portion 11a. If it forms in a part of, you may change to another structure.

  For example, P / 2 pre-lamination radial accommodation holes corresponding to radial accommodation holes in at least one core sheet have two pre-laminations corresponding to two magnet accommodation parts adjacent in the circumferential direction on the radial inner side. A one-side communication hole is formed which communicates with one of the magnet housing portions and does not communicate with one but forms one inner bridge portion between the magnet housing portions before lamination. The rotor core is formed by laminating the core sheets so that the one-side communication hole is disposed in at least a part of each radial accommodation hole in the axial direction.

  Specifically, for example, the rotor 2 (rotor core 8) shown in FIGS. 4 to 6 may be changed. The P / 2 pre-stacking radial accommodation holes corresponding to the radial accommodation holes 8a in the core sheet 11 shown in FIG. 5 constituting the rotor core 8 (see FIGS. 4 and 6) are arranged radially inward in the circumferential direction. It communicates with one (two counterclockwise in FIG. 5) and one (clockwise in FIG. 5) of the two pre-lamination magnet housings 11a corresponding to the two adjacent magnet housings 8e. One side communication hole 11d in which one inner bridge portion 8h is formed between the pre-lamination magnet housing portion 11a without being communicated with the non-stacked magnet housing portion 11a. In this example (see FIG. 5), two one-side communication holes 11d are formed at intervals of 180 °, and the other (remaining two) pre-stacking radial accommodation holes are the independent holes 11c.

The rotor core 8 (see FIGS. 4 and 6) of this example is formed by laminating a large number of the core sheets 11 (see FIG. 5) while being rotated by 90 ° one by one around the axis center.
In this way, the one-side communication hole 11d is arranged in at least a part of the axial direction of the radial accommodation hole 8a. Therefore, in the portion (at least a part of the axial direction) where the one-side communication hole 11d of the radial accommodation hole 8a is arranged, the diameter of the magnet 10 arranged in one of the two magnet accommodation portions 8e adjacent in the circumferential direction. Although movement inward in the direction is not restricted, a gap is formed between the magnet 9 in the radial accommodation hole 8a and the magnet 10 in the magnet accommodation portion 8e on the radial inner side, so that the magnetic resistance at that portion is large. Thus, the leakage magnetic flux can be reduced. In addition, it is easy to form the one-side communication hole 11d in the core sheet 11 by punching or the like (for example, compared to a case where a small protrusion for restricting the movement of the magnet 10 in the radial direction is formed). Therefore, the manufacture is facilitated. Further, since the inner bridge portion 8h is connected along a radial direction to a large portion (a part of the core sheet 11) arranged on the inner side and the outer side in the radial direction (for example, movement of the magnet 10 to the inner side in the radial direction). The strength of the magnet 10 can be increased even if it is thin in the direction in which the movement of the magnet 10 is restricted (as compared to the case where a small protrusion is formed to restrict the movement of the magnet 10).

  The rotor core 8 of this example (see FIGS. 4 to 6) is formed by laminating the core sheet 11 (see FIG. 5) while rotating one by one around the axis, but the present invention is not limited to this. It is good also as a rotor core laminated | stacked, rotating one by one (every 90 degrees) and turning every other. If it does in this way, it will become the composition where the two inner side bridge parts 8h arrange | positioned in both the circumferential directions of the radial direction accommodation hole 8a have equal cross-sectional area.

  Further, for example, the rotor 2 (rotor core 8) shown in FIGS. That is, in the above other examples (see FIGS. 4 to 6), two of the pre-lamination radial direction accommodation holes (four in total) are the one-side communication holes 11d, but all (four) are the one-side communication holes. In addition, the one side communication holes are connected to one circumferential side one (counterclockwise side in FIG. 8), the one side communication hole 11e communicating with the pre-stacking magnet housing portion 11a, and the other circumferential direction (in FIG. 8, The other side communication hole 11f communicates with the pre-lamination magnet housing portion 11a on the clockwise side).

In this example, the rotor core 8 (see FIGS. 7 and 9) is formed by laminating a large number of the core sheets 11 (see FIG. 8) while being rotated by 90 ° one by one about the axis.
In this case, since one one-side communication hole 11e and the other one-side communication hole 11f are disposed in each radial accommodation hole 8a, two magnet accommodation portions adjacent to each other in the circumferential direction on the radial inner side of the radial accommodation hole 8a. Each magnet 10 arranged in 8e is restricted from moving radially inward by the inner bridge portion 8h. Since all of the pre-stacking radial accommodation holes are one-side communication holes (one one-side communication hole 11e and the other one-side communication hole 11f), for example, some of the pre-stacking radial accommodation holes reduce the magnetic resistance. Compared with the case of the independent holes 11c (both inner circumferential bridge portions are formed in the circumferential direction), the magnetic resistance is increased, and the leakage magnetic flux can be reduced.

  In the above embodiment and other examples, the pre-lamination radial accommodation holes (the communication holes 11b, the independent holes 11c, the one-side communication holes 11d, the one-side communication holes 11e, and the other-side communication holes 11f) in one core sheet 11 Although the length in the radial direction is constant, a short hole that is short on the inner side in the radial direction and a long hole that is longer on the inner side in the radial direction than the short hole in order to restrict the movement of the magnet 9 in the radial direction. Good.

For example, you may change to the rotor 2 (rotor core 8) shown in FIGS.
In the core sheet 11 shown in FIG. 11 constituting the rotor core 8 (see FIGS. 10 and 12), the independent hole 11c (see FIG. 2) in the core sheet 11 of the above embodiment is more than the communication hole 11b as a long hole. A short independent hole 11g is formed as a short short hole radially inward.

In this example, the rotor core 8 (see FIGS. 10 and 12) is formed by laminating a large number of the core sheets 11 (see FIG. 11) while being rotated by 90 ° one by one about the axis.
If it does in this way, since a short hole (short independent hole 11g) is arranged in a part of the direction of an axis of a diameter direction accommodation hole, movement to the diameter direction inside of magnet 9 is controlled by the short hole. In the portion where the long hole (communication hole 11b) of the radial accommodation hole 8a is disposed, the movement of the magnet 9 inward in the radial direction is not restricted, but the radially inner end of the long hole is connected to the magnet 9 (via a gap). Therefore, the magnetic resistance in the portion increases (the magnetic path becomes far), and the leakage magnetic flux can be reduced.

Further, for example, the rotor 2 (rotor core 8) shown in FIGS. 13 to 15 may be changed.
The core sheet 11 shown in FIG. 14 constituting the rotor core 8 (see FIGS. 13 and 15) has one of the independent holes 11c (see FIG. 5) in the core sheet 11 of the other examples (see FIGS. 4 to 6). The short independent hole 11g is a short short hole radially inward.

The rotor core 8 (see FIG. 13 and FIG. 15) of this example is formed by laminating a large number of the core sheets 11 (see FIG. 14) while being rotated 90.degree.
If it does in this way, in addition to the effect of the above-mentioned another example (refer to Drawing 4-Drawing 6), the effect (effect of the above-mentioned another example (Drawing 10-Drawing 12)) by the short hole (short independent hole 11g) can be acquired. it can.

  Of course, also in the rotor core 8 of this example (see FIGS. 13 to 15), the core sheets 11 are laminated with the front and back being reversed every other sheet, and arranged in both the circumferential directions of the radial accommodation holes 8a. The two inner bridge portions 8h may have a uniform cross-sectional area.

Further, for example, the rotor 2 (rotor core 8) shown in FIGS. 16 to 18 may be changed.
The core sheet 11 shown in FIG. 17 that constitutes the rotor core 8 (see FIGS. 16 and 18) is formed of the other one-side communication hole 11f (see FIG. 8) in the core sheet 11 of the other example (see FIGS. 7 to 9). One is a short other side communication hole 11h as a short short hole radially inward.

The rotor core 8 (see FIGS. 16 and 18) of this example is formed by laminating a large number of the core sheets 11 (see FIG. 17) while being rotated by 90 ° one by one about the axis.
If it does in this way, in addition to the effect of the above-mentioned another example (refer to Drawing 7-Drawing 9), the effect (effect of the above-mentioned another example (Drawing 10-Drawing 12)) by the short hole (short other side communication hole 11h) will be acquired. be able to.

  In the above embodiment, the pre-lamination radial accommodation hole in the core sheet 11 is composed of the communication hole 11b and the independent hole 11c, but communicates with the pre-lamination magnet accommodation portion 11a adjacent in the circumferential direction on the radial inner side. At the same time, in the radially inner end, the magnet housing portion 8e is placed at a position that restricts the movement of the magnet 9 inside the radial housing hole 8a inward in the radial direction and does not contact the magnet 9 inside the radial housing hole 8a. You may change so that it may have a protrusion communicating hole in which the control protrusion part which protruded to the radial direction outer side was formed in order to control the movement to the radial direction inner side of the magnet 10 inside.

Further, for example, the rotor 2 (rotor core 8) shown in FIGS. 19 to 21 may be changed.
In the core sheet 11 shown in FIG. 20 constituting the rotor core 8 (see FIGS. 19 and 21), the independent hole 11c (see FIG. 2) in the core sheet 11 of the above-described embodiment is formed with the regulation protrusion 11i. It is set as the protruding communication hole 11j. Specifically, the projecting communication hole 11j communicates with the pre-stacking magnet housing portion 11a adjacent in the circumferential direction on the radially inner side, but at the radially inner end portion of the portion that was the void of the communication hole 11b. In order to restrict the movement of the magnet 9 in the direction accommodation hole 8a radially inward, the magnet 10 in the magnet accommodation portion 8e moves inward in the radial direction at a position where it does not contact the magnet 9 in the diameter accommodation hole 8a. In order to restrict the movement, a restricting protruding portion 11i protruding outward in the radial direction is formed. The restriction protrusion 11i in this example is formed in a substantially trapezoidal shape, so that the end surfaces of the magnets 9 and 10 are in contact with the sides of the magnets 9 and 10 when viewed from the axial direction, not by points but by lines. become.

The rotor core 8 (see FIGS. 19 and 21) of this example is formed by laminating a large number of the core sheets 11 (see FIG. 20) while being rotated by 90 ° one by one around the axis center.
If it does in this way, the protrusion communicating hole 11j in which the control protrusion part 11i was formed in a part of axial direction of the radial direction accommodation hole 8a will be arrange | positioned. Therefore, in the portion (a part in the axial direction) where the protruding communication hole 11j of the radial accommodation hole 8a is disposed, the inner bridge portion 8h is not formed while the movement of the magnets 9 and 10 is restricted (the rotor core 8 is formed). Therefore, the magnetic resistance at the portion is increased, and the leakage magnetic flux can be reduced. In addition, forming the protruding communication hole 11j in the core sheet 11 by, for example, punching or the like (for example, as compared with the case of forming a small protruding portion for restricting the movement of the magnets 9 and 10 inward in the radial direction). Since it is easy, the manufacture becomes easy.

  Further, in this example (see FIGS. 19 to 21), the pre-stacking radial accommodation holes other than the one projecting communication hole 11j are communication holes 11b in which the restriction projecting part 11i is a gap, and the radial direction In the portion where the communication hole 11b of the accommodation hole 8a is disposed, although the movement of the magnets 9 and 10 inward in the radial direction is not restricted, the magnetic resistance in the portion increases in the gap. Leakage magnetic flux can be further reduced as compared with the case of using two or more or the communication hole 11b as an independent hole 11c.

  -In said embodiment, when a pair of magnet accommodating part 8e which comprises the V-shaped accommodation hole 8b is each formed as an independent hole (perpendicular to an axial direction) so that a radial direction outer side edge part may not mutually communicate. However, it is not limited to this, You may form so that it may have the top part which connects the radial direction outer sides of the magnet accommodating part 8e (as one connected hole). In this case, the inter-accommodating portion bridge portion 8l is eliminated.

  In the above embodiment, when the width of the inner bridge portion 8h formed between the radially inner side of the magnet housing portion 8e and the radial housing hole 8a as viewed from the axial direction is constant along the radial direction. However, it is not limited to this, You may change so that the width | variety seen from the axial direction of the inner side bridge part 8h may change along a radial direction. For example, the extended portion 8i of the above embodiment is not formed, and the inner bridge portion 8h is substantially triangular when viewed from the axial direction such that the inner bridge portion 8h contacts the longitudinal end portion (in the radial direction) of the magnet 10. Also good.

  In the above embodiment, the rotor core 8 is laminated while the core sheets 11 are rotated one by one around the axis center. However, the present invention is not limited to this, and a substantially similar rotor core is configured by another method (structure). May be. For example, the core sheets 11 may be stacked while being rotated every plural sheets. If it does in this way, since the frequency | count of rotating the core sheet 11 reduces, the manufacture becomes easy.

  In the above embodiment, the rotor core 8 is configured by one type of core sheet 11, but the present invention is not limited to this, and the rotor core is configured by a plurality of types of core sheets (for example, different numbers of independent holes 11c). May be.

  -In above-mentioned embodiment, the magnet accommodating part 8e is linear shape seeing from an axial direction, the width | variety is made constant, and the magnet 10 arrange | positioned in the magnet accommodating part 8e is made into a substantially rectangular parallelepiped shape. However, the present invention is not limited to this, and the shape, width, and the like of the magnet housing portion and the magnet viewed from the axial direction may be changed. That is, the substantially V-shape of the V-shaped accommodation hole is a shape including those in which each straight line (a pair of straight lines) forming the V-shape is curved, or the width of the straight line is not constant. The magnet housing portions corresponding to the straight lines forming the V-shape of the V-shaped housing holes include those that are curved with respect to the straight lines and those that are not constant in width.

  The magnets 9 and 10 and the rotor core 8 according to the above embodiment may be divided in the axial direction and arranged so as to be shifted in the circumferential direction. In this way, the rapid magnetic flux flow (change) between the stator 1 and the rotor 2 can be further reduced, and the cogging torque and torque ripple can be further reduced.

The number of teeth 4 and the number of magnetic poles (magnets 9 and 10) in the above embodiment may be changed to other numbers.
The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.

  (A) The embedded magnet type motor according to claim 2, wherein the rotor core is formed by laminating the core sheet while being rotated by 360 ° / (P / 2). .

  According to this configuration, since the operation of laminating the core sheet while rotating it by 360 ° / (P / 2) is constant, it can be easily manufactured, and for example, automation is facilitated. In addition, when a large number of core sheets are laminated, independent holes and inner bridge portions are regularly present in the axial direction, and the movement of the magnet inward in the radial direction is regularly regulated in the axial direction, so that the magnets are balanced. Can be supported.

  (B) In the interior magnet type motor according to any one of claims 1 to 4 and (A), the width of the inner bridge portion viewed from the axial direction is constant along the radial direction. An embedded magnet type motor characterized by that.

According to this configuration, the width of the inner bridge portion viewed from the axial direction is constant along the radial direction, and the width can be uniformly reduced, so that the leakage magnetic flux can be further reduced.
(C) In the embedded magnet type motor according to any one of claims 1 to 6, and (a) and (b) above, a pair corresponding to each straight line forming the V-shape of the V-shaped accommodation hole The embedded magnet type is characterized in that each of the magnet housing portions is formed independently, so that a bridge portion between the housing portions extending in the radial direction is formed radially outward between the pair of magnet housing portions. motor.

  According to this configuration, since the outer bridge portion formed between the magnet accommodating portion and the outer peripheral surface of the rotor core is connected to the inter-accommodating portion bridge portion (that has a top portion that connects the magnet accommodating portions to each other (that is, the accommodating portion). The strength of the rotor core is increased and its deformation is prevented compared to the case where no intermediate bridge portion is formed.

  In particular, in the core sheet alone, when the pre-lamination magnet accommodating portions communicate with each other (having a communicating top portion), the radially inner portion and the radially outer portion thereof are portions where independent holes are formed. Since it is connected only by the inner bridge portion, its rigidity is low and it may be difficult to handle, but the strength of the core sheet is increased compared to this, its deformation is prevented, and handling is easy.

The top view of the stator and rotor of an embedded magnet type motor in this Embodiment. The top view of the core sheet in this Embodiment. The principal part perspective view of the rotor core in this Embodiment. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example. The top view of the stator and rotor of an embedded magnet type motor in another example. The top view of the core sheet in another example. The perspective view of the rotor core in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Rotor, 8 ... Rotor core, 8a ... Radial accommodation hole, 8b ... V-shaped accommodation hole, 8e ... Magnet accommodation part, 8h ... Inner bridge part, 9, 10 ... Magnet, 11 ... Core sheet, 11a ... Before lamination | stacking Magnet housing portion, 11b ... communication hole (pre-lamination radial direction accommodation hole), 11c ... independent hole (pre-lamination radial direction accommodation hole), 11d ... one-side communication hole (pre-lamination radial direction accommodation hole), 11e ... one-side communication hole (Pre-lamination radial direction accommodation hole and one-side communication hole), 11f... One other side communication hole (pre-lamination radial direction accommodation hole and one-side communication hole), 11g... Short independent hole (Pre-lamination radial direction accommodation hole and independent hole), 11h ... short other one side communication hole (stacking radial direction accommodation hole, one side communication hole and other one side communication hole), 11i ... regulating protrusion, 11j ... protruding communication hole.

Claims (6)

A core sheet is laminated in the axial direction and has a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction, and magnets are disposed in the housing holes so that the number of magnetic poles is P poles. An embedded magnet type motor having a rotor,
The housing hole is formed by forming P / 2 radial housing holes extending in a substantially radial direction and substantially V-shaped housing holes protruding outward in the radial direction. Formed alternately,
The magnets are disposed in the radial accommodating holes and are disposed in the respective magnet accommodating portions corresponding to the respective straight lines forming the V shape of the V-shaped accommodating holes,
The magnet arranged in the radial accommodation hole and the magnet arranged in the magnet accommodation part adjacent to one of the circumferential directions constitute one magnetic pole, and the radial accommodation hole A different magnetic pole is configured by the magnet disposed in the magnet and the magnet disposed in the magnet housing portion adjacent to the other in the circumferential direction,
The P / 2 pre-lamination radial accommodation holes corresponding to the radial accommodation holes in the core sheet communicate with the pre-lamination magnet accommodation portions corresponding to the magnet accommodation portions adjacent to each other in the circumferential direction on the radially inner side. A hole and an independent hole in which an inner bridge portion is formed between the pre-lamination magnet housing portion and the pre-lamination magnet housing portion without communicating with the pre-lamination magnet housing portion,
In the rotor core, the independent holes are arranged in a part of the radial accommodation holes in the axial direction, and movement of the magnets arranged in the magnet accommodation portion inward in the radial direction is restricted by the inner bridge portion. As described above, the core sheet is laminated, and an embedded magnet type motor. The interior magnet type motor according to claim 1,
Only one independent hole is formed in the core sheet. A core sheet is laminated in the axial direction and has a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction, and magnets are disposed in the housing holes so that the number of magnetic poles is P poles. An embedded magnet type motor having a rotor,
The housing hole is formed by forming P / 2 radial housing holes extending in a substantially radial direction and substantially V-shaped housing holes protruding outward in the radial direction. Formed alternately,
The magnets are disposed in the radial accommodating holes and are disposed in the respective magnet accommodating portions corresponding to the respective straight lines forming the V shape of the V-shaped accommodating holes,
The magnet arranged in the radial accommodation hole and the magnet arranged in the magnet accommodation part adjacent to one of the circumferential directions constitute one magnetic pole, and the radial accommodation hole A different magnetic pole is configured by the magnet disposed in the magnet and the magnet disposed in the magnet housing portion adjacent to the other in the circumferential direction,
The P / 2 pre-lamination radial accommodation holes corresponding to the radial accommodation holes in at least one core sheet are two laminations corresponding to the two magnet accommodation portions that are radially inward and adjacent to each other in the circumferential direction. It has a one-side communication hole that communicates with one of the front magnet housing portions and does not communicate with one but forms one inner bridge portion with the pre-lamination magnet housing portion,
The rotor core is an embedded magnet type motor in which the core sheet is laminated so that the one-side communication hole is disposed in at least a part of the radial accommodation hole in the axial direction. The interior magnet type motor according to claim 3,
All of the stacking radial direction accommodation holes are the one-side communication holes,
The one-side communication hole includes a one-side communication hole that communicates with one of the pre-stacking magnet housing portions in the circumferential direction, and a one-side communication hole that communicates with the other pre-stacking magnet housing portion in the circumferential direction.
The embedded magnet type motor, wherein the rotor core is formed by laminating the core sheet so that the one-side communication hole and the other-side communication hole are disposed in each radial accommodation hole. A core sheet is laminated in the axial direction and has a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction, and magnets are disposed in the housing holes so that the number of magnetic poles is P poles. An embedded magnet type motor having a rotor,
The housing hole is formed by forming P / 2 radial housing holes extending in a substantially radial direction and substantially V-shaped housing holes protruding outward in the radial direction. Formed alternately,
The magnets are disposed in the radial accommodating holes and are disposed in the respective magnet accommodating portions corresponding to the respective straight lines forming the V shape of the V-shaped accommodating holes,
The magnet arranged in the radial accommodation hole and the magnet arranged in the magnet accommodation part adjacent to one of the circumferential directions constitute one magnetic pole, and the radial accommodation hole A different magnetic pole is configured by the magnet disposed in the magnet and the magnet disposed in the magnet housing portion adjacent to the other in the circumferential direction,
The P / 2 pre-lamination radial accommodation holes corresponding to the radial accommodation holes in the at least one core sheet are pre-lamination magnet accommodation portions corresponding to the magnet accommodation portions adjacent in the circumferential direction on the radial inner side. And in contact with the magnet disposed in the radial accommodation hole at the radially inner end to restrict the movement of the magnet disposed in the radial accommodation hole inward in the radial direction. In order to restrict the radially inward movement of the magnet disposed in the magnet housing portion at a position where it does not have a protruding communication hole formed with a protruding protrusion protruding radially outward,
The rotor core is an embedded magnet type motor in which the core sheet is laminated so that the projecting communication hole is disposed in at least a part of the radial accommodation hole in the axial direction. The interior magnet type motor according to claim 5,
Only one protruding communication hole is formed in the core sheet,
The other pre-stacking radial accommodation hole is a communication hole that communicates with the pre-lamination magnet housing portion that is adjacent in the circumferential direction on the radially inner side, and has a portion of the restriction projecting portion as a gap. Embedded magnet type motor.

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