JP5117833B2 - 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

  By the way, in the rotor core of the embedded magnet type motor as described above, the magnet is arranged up to the radially inner end of the radial accommodation hole, and the radially inner end restricts the movement of the magnet inward in the radial direction. It has become. However, since the part (part of the rotor core) constituting the radially inner end of the radial accommodation hole constitutes a magnetic path with a small magnetic resistance, there is a problem that the leakage magnetic flux in the part is large. 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.

The invention according to claim 1 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 number of magnetic poles is P poles (where P is 4). An embedded magnet type motor having a rotor in which a magnet is disposed in the accommodation hole so as to be an even number) , wherein the accommodation hole includes a radial accommodation hole extending in a substantially radial direction, and a radial direction. The P-shaped substantially V-shaped receiving holes projecting outward are formed in P / 2 pieces, and they are alternately formed in the circumferential direction, and the magnet is placed in the radial receiving hole. The magnets disposed in the respective magnet housing portions corresponding to the respective straight lines forming the V-shape of the V-shaped housing holes, the magnets disposed in the radial housing holes, and the circumferential direction thereof One magnetic pole is formed by the magnet disposed in the magnet housing portion adjacent to one of the two. One magnetic pole is formed by the magnet disposed in the radial accommodating hole and the magnet disposed in the magnet accommodating portion adjacent to the other in the circumferential direction. a is, the radial receiving hole and the corresponding P / 2 pieces of all before lamination radial receiving hole in the core sheet, while being elongated to the inside in the radial direction than the magnet, at least in part , the projecting portion protruding from only one side of the radial direction perpendicular to the radial direction so as to restrict the inward movement of the magnet is formed, the rotor core, the protruding part of the axial direction of each of said radial housing hole part Ri is name the core sheet to be disposed are stacked, and the protrusion formed on one of the core sheet on both core sheet to be laminated adjacent to the top and bottom of one core sheet in the laminating direction Corresponding position in the axial direction The core sheet so that the projecting portion is not formed ing are stacked.

  According to this configuration, the protrusion is disposed at least in a part of the radial accommodation hole in the axial direction, and movement of the magnet inward in the radial direction is restricted by the protrusion. The radial accommodation hole is formed longer in the radial direction than the magnet, and the radially inner end thereof is separated from the magnet (the movement inward in the radial direction is restricted by the protruding portion). Resistance increases (magnetic path becomes far), and leakage magnetic flux can be reduced. Moreover, since the protruding portion protrudes only from one side in the radial direction, for example, the core sheet has better punchability than the case where the protruding portion protrudes from both sides in the radial direction, and is easily manufactured. be able to.

According to a second aspect of the present invention, in the embedded magnet type motor according to the first aspect, only one protrusion is formed on the core sheet.
According to this configuration, since the number of protrusions that reduce the magnetic resistance is one in the core sheet, the overall magnetic resistance is the largest, and the leakage magnetic flux can be reduced most.

  According to a third aspect of the present invention, in the interior magnet type motor according to the first or second aspect, the radially inner end of the radial accommodation hole has a distance from the axial center of the rotor core from the coaxial center. The distance was set to be equal to or less than the distance to the radially inner end of the magnet housing portion.

According to this configuration, the magnetic path to be formed between the magnet housing portion and the radial housing hole on the radially inner side becomes narrow, and the leakage magnetic flux in the portion can be reduced.
According to a fourth aspect of the present invention, in the embedded magnet type motor according to any one of the first to third aspects, the distance between the projecting portion and the axial center of the rotor core is from the coaxial center to the magnet housing. It was set larger than the distance to the radially inner end of the part.

  According to the same configuration, the radially inner end portion of the magnet disposed in the radially accommodating hole has a distance from the axial center of the rotor core from the coaxial center to the radially inner end portion of the magnet accommodating portion. Since the distance is larger than the distance, when magnetizing in a state of being arranged in the radial accommodation hole, for example, the distance from the axial center of the radial inner end of the magnet and the radial inner end of the radial accommodation hole is Compared to the same case, it can be easily and satisfactorily magnetized. Therefore, the waste of the magnet can be reduced.

  According to a fifth aspect of the present invention, in the embedded magnet type motor according to any one of the first to fourth aspects, the protruding amount of the protruding portion is a width in a direction perpendicular to the radial direction in the radial receiving hole. The rotor core is formed by laminating the core sheets so that the protruding portions protrude the same number from both sides of the radial accommodation hole in the radial direction.

  According to this configuration, since the protruding portions protrude from both sides of the radial accommodation hole in the radial orthogonal direction, the magnets are balanced (compared to those protruding from only one side of the radial accommodation hole in the radial orthogonal direction). Can be supported. In addition, since the same number of protrusions protrude from both sides of the radial accommodation hole in the radial direction, the balance of the rotor core itself is good. Further, since the protruding amount of the protruding portion is set to be smaller than half of the width in the radial direction in the radial direction receiving hole, the protruding portions protruding from both sides of the radial direction receiving hole in the radial direction contact each other. Therefore, the magnetic resistance is not reduced (the magnetic path is not shortened).

  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. Outer protrusions 8 d (see FIG. 3) that protrude in the radial direction so as to be smaller than the other portions are formed in a part of the axial direction (every three core sheets 11). 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).

  Also, on the radially inner side slightly spaced from the radially inner end of the radial accommodation hole 8a, one side in the orthogonal direction of the radial direction (counterclockwise in FIG. 1) is arranged to restrict the movement of the magnet 9 in the radial direction. Inner protrusions 8e (see FIG. 3) as protrusions protruding only from the rotation side are formed in a part of the axial direction (every three core sheets 11). In addition, the protrusion amount of the inner side protrusion part 8e of this Embodiment is set larger than the half of the width | variety of the orthogonal direction of the radial direction in the radial direction accommodation hole 8a.

  The V-shaped accommodation hole 8b includes a pair of magnet housing portions 8f corresponding to two straight lines forming the V-shape. The pair of magnet housing portions 8f of the present embodiment are formed as independent holes (through in the axial direction) so that the distance in the circumferential direction is closer to the outer side in the radial direction but they are not communicated with each other even at the outer end in the radial direction. ing. Further, a V-shaped air gap 8g 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 8f. The V-shaped side gap 8g 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 viewed from the axial direction to restrict the movement of the magnet 10 to the radially outer side (the V-shaped side gap 8g) is radially inward of the V-shaped side gap 8g on the radially outer side of the magnet housing portion 8f. A protruding portion 8h that protrudes so as to be smaller than the other portions is formed. The projecting portions 8h are formed so as to project the same amount from the opposing sides of the pair of magnet housing portions 8f to the separated sides.

  Further, the radially inner end of the magnet housing portion 8f in the present embodiment is perpendicular 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 so as to face the side (the inner wall surface excluding the inner protrusion 8e) facing in the direction. And the width | variety seen from the axial direction of the inner side bridge | bridging part 8i formed between the radial direction inner side of the magnet accommodating part 8f and the radial direction accommodating hole 8a is formed so that it may become constant along a radial direction. In addition, this is implement | achieved by extending the substantially triangular extension part 8j seeing from an axial direction at the radial direction inner side edge part of the magnet accommodating part 8f. In the rotor core 8 having the above-described shape, an outer bridge portion 8k is 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 8f. An outer bridge portion 8 l is formed between the (V-shaped side gap 8 g) 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 8m that extends radially outward (connected to the outer bridge portion 8l) between the pair of magnet accommodating portions 8f.

  Here, as shown in FIG. 2, P / 2 pre-stacking radial accommodation holes 11 a corresponding to the radial accommodation holes 8 a in the core sheet 11 constituting the rotor core 8 are arranged in the radial direction from the magnet 9. In addition to being formed long, at least one of the inner protrusions 8e is formed to protrude from one side of the orthogonal direction in the radial direction so as to restrict the movement of the magnet 9 inward in the radial direction. In the present embodiment, only one inner protrusion 8e is formed in the core sheet 11 (that is, one of the four pre-stacking radial accommodation holes 11a). In the present embodiment, the outer protruding portion 8d is also formed only in the pre-lamination radial direction accommodation hole 11a in which the inner protruding portion 8e is formed. That is, in the present embodiment, the inner protrusion 8e and the outer protrusion 8d are not formed in the three pre-stacking radial accommodation holes 11a of the single core sheet 11.

  In the present embodiment, the radially inner end of the radial accommodation hole 8a (the pre-stacking radial accommodation hole 11a) has a distance from the axial center of the rotor core 8 from the coaxial center to the magnet housing 8f (before the lamination). The distance is equal to or less than the distance to the radially inner end of the magnet housing portion 11b) and is set to be substantially the same.

  Further, in the present embodiment, the inner protrusion 8e has a distance from the axial center of the rotor core 8 from the distance from the coaxial center to the radially inner end of the magnet housing portion 8f (pre-lamination magnet housing portion 11b). It is set large.

  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.

  In addition, substantially rectangular parallelepiped magnets 9 and 10 are disposed in the radial accommodation hole 8a and the magnet accommodation portion 8f, respectively. The magnets 9 and 10 of the present embodiment are disposed in the radial accommodation hole 8a and the magnet accommodation portion 8f in consideration of ease of insertion into the radial accommodation hole 8a and the magnet accommodation portion 8f. Magnetization was performed later.

  In the rotor 2 configured as described above, the magnet 9 is disposed in the radial accommodation hole 8a and the magnet accommodation portion 8f 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 8f, one magnetic pole (for example, N pole) is configured.

Next, characteristic effects of the above embodiment will be described below.
(1) The inner protrusion 8e is disposed in a part of the radial accommodation hole 8a in the axial direction, and movement of the magnet 9 inward in the radial direction is restricted by the inner protrusion 8e. The radial accommodation hole 8a is formed longer in the radial direction (inward) than the magnet 9, and the radially inner end thereof is separated from the magnet 9 (movement inward in the radial direction is restricted by the inner protruding portion 8e). For this reason, the magnetic resistance in the portion increases (the magnetic path becomes far), and the leakage magnetic flux can be reduced. Moreover, since the inner protrusion 8e protrudes only from one side in the radial direction, for example, the punchability of the core sheet 11 is better than, for example, the case where the inner protrusion 8e protrudes from both sides in the radial direction. Can be manufactured easily.

  (2) Since the core sheet 11 has one inner protrusion 8e that reduces the magnetic resistance, the overall magnetic resistance is the largest (compared to two or more), and the leakage flux is reduced most. can do.

  (3) The radially inner end of the radial accommodation hole 8a (pre-lamination radial accommodation hole 11a) has a distance from the axial center of the rotor core 8 from the coaxial center to the magnet housing 8f (pre-lamination magnet housing 11b). ) And the distance to the radially inner end is set to be substantially the same. If it does in this way, the magnetic path (inner side bridge | bridging part 8i) formed between the magnet accommodating part 8f and the radial direction accommodation hole 8a on the radial inner side will become thin, and the leakage magnetic flux in this part will be reduced. be able to.

  (4) The inner projecting portion 8e is set such that the distance from the axial center of the rotor core 8 is larger than the distance from the coaxial center to the radially inner end of the magnet housing portion 8f (pre-lamination magnet housing portion 11b). In this way, the radially inner end of the magnet 9 disposed in the radial accommodation hole 8a has a distance from the axial center of the rotor core 8 from the coaxial center to the magnet accommodation portion 8f (pre-lamination magnet accommodation portion). 11b) is greater than the distance to the radially inner end. Therefore, when magnetizing in the state of being disposed in the radial accommodation hole 8a, it is difficult to be affected by the magnet 10 disposed in the magnet housing portion 8f, and can be easily and satisfactorily magnetized. Therefore, waste of the magnet 9 can be reduced. Note that this indicates that the distance from the radially inner end of the magnet disposed in the radially accommodating hole and the axial center of the rotor core from the coaxial center to the radially inner end of the magnet accommodating portion is determined by experiments. This is derived from the occurrence of a poor magnetization (magnet waste) at the radially inner end of the magnet when it is substantially equal to the distance.

  (5) The rotor core 8 is formed by laminating a large number of core sheets 11 at 360 ° / (P / 2) one by one around the axis center while being rotated by 90 ° in this 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. When a large number of core sheets 11 are laminated, the inner protrusions 8e are regularly present in the axial direction (in this embodiment, every three core sheets 11), and the movement of the magnet 9 inward in the radial direction is axial. Since the direction is regularly regulated, the magnet 9 can be supported in a balanced manner.

The above embodiment may be modified as follows.
In the above embodiment, the inner protrusion 8e protrudes only from one side (counterclockwise side in FIG. 1) in the radial direction in the radial accommodation hole 8a. As long as it protrudes only from one side (clockwise side or counterclockwise side) in the direction accommodation hole 11a, you may change into another structure.

  For example, you may change as shown in FIGS. In this example, in the core sheet 22 constituting the rotor core 21, P / 2 pre-stacking radial accommodation holes 22 a corresponding to the radial accommodation holes 21 a are formed longer than the magnet 9 in the radial direction, and all of them. In addition, an inner projecting portion 22b projecting from one side (counterclockwise side in FIG. 5) in the radial direction is formed so as to restrict the movement of the magnet 9 inward in the radial direction. In this example, the outer protrusions 22c are also formed in all the pre-stacking radial accommodation holes 22a. Further, the protruding amount of the inner protruding portion 22b in this example is set to be smaller than half the width in the radial direction perpendicular to the radial direction receiving hole 21a (the pre-stacking radial direction receiving hole 22a).

  The rotor core 21 is formed by laminating the core sheets 22 so that the same number of inner protrusions 22b protrude from both sides of the radial accommodation hole 21a in the radial direction. Specifically, the rotor core 21 in this example is formed by laminating a large number of core sheets one by one while being turned upside down, and the inner protrusion 22b is different on each side of the core sheet 11 as shown in FIG. It is arranged so that it protrudes from (it is alternately).

  In this case, since the inner protruding portion 22b protrudes from both sides of the radial accommodation hole 21a in the radial direction orthogonal to each other (the one protruding only from one side of the radial accommodation hole in the radial direction (the above embodiment)). The magnet 9 can be supported with a good balance. Further, since the same number of inner protrusions 22b protrude from both sides of the radial accommodation hole 21a in the radial direction, the balance of the rotor core 21 itself is improved, and vibrations based on the unbalance of the rotor core itself can be reduced. . Further, since the protruding amount of the inner protruding portion 22b is set to be smaller than half of the width in the radial direction orthogonal to the radial receiving hole 21a (pre-stacking radial receiving hole 22a), the radial direction in the radial receiving hole 21a The inner projecting portions 22b projecting from both sides in the orthogonal direction are not in contact with each other, so that the magnetic resistance is not reduced (the magnetic path is shortened).

  In the above embodiment, the inner protrusion 8e (22b) is formed slightly apart from the radially inner end of the radial housing hole 8a, but is not limited to this. For example, FIG. It is good also as the inner side protrusion part 31a which protrudes from the one side of the orthogonal | vertical direction of the radial direction inside radial direction, without separating from a radial direction inner edge part like the core sheet 31 to show. In this example, the inner projecting portion 31 a is formed in all the pre-lamination radial direction accommodation holes 31 b of the core sheet 31. In this example, the outer protrusions 31c are also formed in all the pre-stacking radial accommodation holes 31b. The rotor core in this example is formed by simply laminating a large number of core sheets 31 (without rotating). In this way, although the magnetic path is shorter than that in the above embodiment, the rigidity of the inner protrusion 31a is increased, the deformation is reduced, and the movement of the magnet inward in the radial direction is strengthened (more Can be regulated)

  In the above embodiment, only one inner protrusion 8e is formed on the core sheet 11. However, the present invention is not limited to this, and two or more inner protrusions 8e may be formed on the core sheet 11. . In this case, it is desirable to arrange the inner protrusions 8e so as to be regularly present in the axial direction in the rotor core. For example, when two inner protrusions 8e are continuously formed in the circumferential direction, a large number of core sheets are stacked while being rotated by 180 ° so that the inner protrusions 8e are periodically present in the axial direction in the rotor core. Alternatively, a large number of core sheets may be stacked while being reversed one by one on the front and back. Of course, including the above-described embodiments, the inner protrusions 8e may be arranged so as to be irregularly present in the axial direction in the rotor core.

  In the above embodiment, the radially inner end of the radial housing hole 8a has a distance from the axial center of the rotor core 8 that is the radially inner end of the magnet housing portion 8f (pre-lamination magnet housing portion 11c) from the coaxial center. However, the present invention is not limited to this, and the distance may be set larger than the distance from the coaxial center to the radially inner end of the magnet housing portion 8f (magnet housing portion 11c before lamination).

  In the above embodiment, the inner projecting portion 8e is set such that the distance from the axial center of the rotor core 8 is greater than the distance from the coaxial center to the radially inner end of the magnet housing portion 8f (pre-lamination magnet housing portion 11c). However, the present invention is not limited to this, and it may be set to be equal to or less than the distance from the coaxial center to the radially inner end of the magnet housing portion 8f (pre-lamination magnet housing portion 11c).

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

  In the above embodiment, when the width of the inner bridge portion 8i formed between the radially inner side of the magnet housing portion 8f and the radial housing hole 8a is constant along the radial direction. However, the present invention is not limited to this, and the width of the inner bridge portion 8i viewed from the axial direction may be changed along the radial direction. For example, the extending portion 8j of the above embodiment need not be formed.

  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 with one type of core sheet 11, but the present invention is not limited to this, and the rotor core may be configured with a plurality of types of core sheets.
In the above embodiment, the magnet housing portion 8f is linear when viewed from the axial direction and has a constant width, and the magnet 10 disposed in the magnet housing portion 8f has 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 stacked, the protrusions 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 magnet can be supported in a balanced manner. it can.

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 principal part perspective view of the rotor core in another example. The top view of the core sheet in another example.

Explanation of symbols

  2 ... rotor, 8, 21 ... rotor core, 8a, 21a ... radial accommodation hole, 8b ... V-shaped accommodation hole, 8e, 22b, 31a ... inner protrusion (protrusion), 8f ... magnet accommodation, 9, 10 ... ... Magnets 11, 22, 31 ... Core sheets, 11a, 22a, 31b ... Radial accommodation holes before lamination.

Claims (5)

The 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 the number of magnetic poles is P poles (where P is an even number of 4 or more). An embedded magnet type motor including a rotor in which a magnet is disposed in a receiving hole,
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 radial receiving hole and the corresponding P / 2 pieces of all before lamination radial receiving hole in the core sheet, along with longer formed radially inward of the magnets, at least in part, of the magnet Protruding portions that protrude only from one side in the orthogonal direction of the radial direction are formed in order to restrict movement inward in the radial direction,
Laminating the rotor core, Ri Na is the core sheet is laminated such that the protruded portion is arranged in a part of the axial direction of each of said radial housing hole, adjacent to and below the one core sheet in the laminating direction embedded magnets in which the projection and the core sheet so that the projecting portion is not formed in the corresponding position in the axial direction, characterized in Rukoto such are stacked to be formed on one of the core sheet on both core sheet being Type motor. The interior magnet type motor according to claim 1,
An embedded magnet type motor, wherein only one protrusion is formed on the core sheet. The interior magnet type motor according to claim 1 or 2,
The radial inner end of the radial accommodation hole is configured such that the distance from the axial center of the rotor core is set to be equal to or less than the distance from the coaxial center to the radial inner end of the magnet housing. Magnet type motor. The interior magnet type motor according to any one of claims 1 to 3,
The protrusion is configured such that the distance from the axial center of the rotor core is set larger than the distance from the coaxial center to the radially inner end of the magnet housing part. The interior magnet type motor according to any one of claims 1 to 4,
The protrusion amount of the protrusion is set to be smaller than half of the width in the radial direction perpendicular to the radial accommodation hole,
The rotor core is an embedded magnet type motor in which the core sheet is laminated so that the protruding portions protrude the same number from both sides of the radial accommodation hole in the radial direction.

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