JP2007124819A - Embedded-magnet motor and its rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embedded-magnet motor capable of adjusting the center of gravity of a rotor without protruding a member for adjusting the center of gravity to the outside, and without forming a special hole at a rotor core separately, and to provide its rotor. <P>SOLUTION: This embedded-magnet motor has the rotor core 8 in which a plurality of accommodating holes 8a penetrated in an axial direction are formed in a circumferential direction, and the rotor 2 in which a first and a second magnets 9, 10 are disposed in the respective accommodating holes 8a. Besides, the specific gravity of the first magnet 9 and that of the second magnet 10 disposed in the accommodating holes 8a are the same, but a length in the axial direction is different from each other. Accordingly, the volume and weight become different. Therefore, the structure in the accommodating hole 8a is set to be different from that in the other accommodating hole 8a, thus adjusting the center of gravity of the rotor 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an interior magnet type motor and its rotor.

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.
By the way, the rotor (output shaft) of such an embedded magnet type motor may be connected to a load that fluctuates periodically, for example, via a cam. In such a case, for example, a member for adjusting the center of gravity (a so-called balancer) is generally attached to the outside of the rotor core so as to cancel the load that fluctuates, so that the rotational balance including the load is generally well adjusted. It has become. As another configuration, a special hole for adjusting the center of gravity is formed in the rotor core in addition to the accommodation hole in which the magnet is accommodated, thereby favorably adjusting the rotational balance including the load ( For example, see Patent Document 1).
JP 2002-165406 A

  However, when a member for adjusting the center of gravity (so-called balancer) is attached to the outside of the rotor core, the member for adjusting the center of gravity partially protrudes outside the rotor core, thereby ensuring a large space for accommodating the rotor. As a result, there is a possibility that the embedded magnet type motor becomes large. In addition, when a special hole for adjusting the center of gravity is separately formed in the rotor core, the design and shape of the rotor core are complicated, or the magnetic path in the rotor core is narrowed and high torque is hindered. There is a fear.

  The present invention has been made in order to solve the above-described problems, and the purpose thereof is to prevent a member for adjusting the center of gravity from projecting to the outside, and to form a special hole separately in the rotor core. It is an object of the present invention to provide an embedded magnet type motor that can adjust the center of gravity of the rotor and the rotor.

  In the invention according to claim 1, an embedded magnet type having a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction and having a rotor in which each magnet is disposed in each of the housing holes. It is a motor, The center of gravity of the said rotor was adjusted by making the structure in the said accommodation hole different from others.

  According to this configuration, since the center of gravity of the rotor is adjusted by making the configuration in the accommodation hole in which the magnet is disposed different from the others, the member for adjusting the center of gravity protrudes to the outside. There is no need to form a special hole separately in the rotor core.

  According to a second aspect of the present invention, in the interior magnet type motor according to the first aspect, the center of gravity of the rotor is made different from the weight of the magnet disposed in the accommodation hole. Adjusted.

  According to this configuration, since the weight of the magnet disposed in the accommodation hole is made different from the others, the center of gravity of the rotor can be easily adjusted. For example, it can be set as the structure which does not have another member for adjusting a gravity center.

  According to a third aspect of the present invention, in the interior magnet type motor according to the second aspect, the center of gravity of the rotor is adjusted by making the volume of the magnet disposed in the accommodation hole different from the others. An embedded magnet type motor characterized by the above.

  According to the same configuration, the volume of the magnet disposed in the accommodation hole is made different from the others, so that, for example, the center of gravity of the rotor can be easily made only by making the axial length of the magnet different from others. Can be adjusted.

  According to a fourth aspect of the present invention, in the interior magnet type motor according to any one of the first to third aspects, a member to be accommodated other than the magnet is disposed in the accommodation hole, and the member to be accommodated is provided. The center of gravity of the rotor was adjusted by making the weight of the rotor different from the others.

  According to this configuration, since the weight of the member to be accommodated other than the magnet disposed in the accommodation hole is made different from the others, the center of gravity of the rotor can be easily adjusted. In addition, according to the same configuration, for example, all the magnets can have the same weight and volume.

  According to a fifth aspect of the present invention, in the embedded magnet type motor according to the fourth aspect, the member to be accommodated is provided at an axial end of the accommodating hole to prevent the magnet from moving in the axial direction. It is the suppression member for.

  According to this configuration, the member to be accommodated is a restraining member that is provided at the axial end of the accommodation hole and prevents the magnet from moving in the axial direction. A member for preventing the movement of the direction is also used, and an increase in the number of parts is suppressed.

  According to a sixth aspect of the present invention, in the interior magnet type motor according to the fourth or fifth aspect, the center of gravity of the rotor is adjusted by making the material of the member to be received different from others. Features a built-in magnet motor.

According to this configuration, since the material of the member to be accommodated is different from the others, the center of gravity of the rotor can be easily adjusted.
According to a seventh aspect of the present invention, in the embedded magnet type motor according to any one of the first to sixth aspects, the housing hole is a substantially V-shaped housing hole that protrudes radially inward. And the said magnet is a V-shaped permanent magnet corresponding to the said V-shaped accommodation hole.

  According to the same configuration, the magnet is a V-shaped permanent magnet arranged in a substantially V-shape projecting radially inward, so that it is simply compared with a curved or linear magnet arranged along the circumferential direction. Many magnets can be used, and high torque can be achieved. In the case of a V-shaped permanent magnet, the magnetic path is likely to be narrower than that of a curved or linear magnet that is simply arranged along the circumferential direction. There is a possibility that the magnetic path will be narrowed and high torque will be hindered, but there is no need to form a special hole separately, so the effect of securing the magnetic path and maintaining high torque is remarkable. Become.

  According to an eighth aspect of the present invention, there is provided a rotor of an embedded magnet type motor having a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction, and magnets are respectively disposed in the housing holes. Thus, the center of gravity of the housing was adjusted by making the configuration in the accommodation hole different from the others.

  According to this configuration, since the center of gravity of the rotor is adjusted by making the configuration in the accommodation hole in which the magnet is disposed different from the others, the member for adjusting the center of gravity protrudes to the outside. There is no need to form a special hole separately in the rotor core.

  According to the present invention, a member for adjusting the center of gravity does not protrude to the outside, and an embedded magnet type that can adjust the center of gravity of the rotor without separately forming a special hole in the rotor core. A motor and its rotor can be provided.

(First embodiment)
Hereinafter, a first 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. A stator core 5 and a winding 6 (indicated by a one-dot chain line in FIG. 1 only) are wound around each tooth 4 by concentrated winding via an insulator (not shown). In the present embodiment, six teeth 4 are formed.

  The rotor 2 includes a rotating shaft 7, a rotor core 8, first and second magnets 9 and 10, and a suppressing member 11 (see FIG. 2). In the present embodiment, four first and second magnets 9 and 10 are provided (that is, the number of magnetic poles is set to 4). Further, the rotating shaft 7 of the present embodiment is connected to a load that fluctuates periodically, for example, via a cam. The rotor core 8 is formed in a substantially cylindrical shape by laminating plate materials in the axial direction, and a large-diameter portion at the center of the rotary shaft 7 is fitted in the center hole thereof, and is supported rotatably inside the stator 1. The rotor core 8 is formed with four accommodation holes 8a penetrating in the axial direction side by side in the circumferential direction. The accommodation hole 8a of the present embodiment is formed in a straight line shape along the circumferential direction when viewed from the axial direction. The accommodation holes 8a have the same shape and are formed at equiangular intervals in the circumferential direction.

  The first and second magnets 9 and 10 are accommodated and held in the accommodation hole 8a. Specifically, the first and second magnets 9 and 10 are formed in a rectangular parallelepiped, and the first magnet 9 is longer in the axial direction than the other three second magnets 10 (in the left-right direction in FIG. 2). Is set short. In other words, the first magnet 9 has a smaller volume and a lighter weight than the other three second magnets 10. The first and second magnets 9 and 10 have the same specific gravity. The axial length of the second magnet 10 is set to be the same as the axial length of the rotor core 8. The first magnet 9 is fitted and held in one receiving hole 8a (the upper receiving hole 8a in FIGS. 1 and 2). Further, as shown in FIG. 2, the axial movement of the first magnet 9 is prevented at both ends in the axial direction of the accommodation hole 8a in which the first magnet 9 is disposed (upper side in FIG. 2). The restraining member 11 for carrying out is inserted and hold | maintained. The suppressing member 11 of the present embodiment is made of a resin material having a specific gravity smaller than that of the first and second magnets 9 and 10. Further, the second magnet 10 is fitted and held in another receiving hole 8a (the left and right and lower holding holes 8a in FIG. 1). In addition, the 1st and 2nd magnets 9 and 10 adjacent to the circumferential direction are arrange | positioned so that the magnetic pole (the direction) may become alternate (it is reverse). In the rotor core 8, extended portions 8 b extending radially outward to a predetermined position in the vicinity of the outer peripheral surface of the rotor core 8 are continuous (extending) with the receiving holes 8 a at both ends in the circumferential direction of the receiving holes 8 a. Is formed. The predetermined position is a position at which the minimum rigidity of the rotor core 8 can be maintained, and the extending portion 8b has a leakage magnetic flux (from the north pole of the first and second magnets 9, 10 immediately This is to reduce the magnetic flux toward the south pole.

  In the rotor 2 configured as described above, the center of gravity is adjusted by making the configuration in the accommodation hole 8a (in this embodiment, the upper accommodation hole 8a in FIGS. 1 and 2) different from the others. ing. That is, the weight of the first magnet 9 disposed in the accommodation hole 8a (in this embodiment, the upper accommodation hole 8a in FIGS. 1 and 2) (specifically, the weight obtained by adding the suppression member 11 thereto). ) Is lighter than the weight of the second magnet 10 disposed in the other receiving hole 8a, so that the center of gravity shifts from the axial center (in FIG. 1 and FIG. ). Thereby, the rotation balance including the periodically fluctuating load connected to the rotating shaft 7 is made good.

Next, characteristic actions and effects of the first embodiment will be described below.
(1) Since the center of gravity of the rotor 2 is adjusted by making the configuration in the housing hole 8a (in this embodiment, the upper housing hole 8a in FIGS. 1 and 2) different from the others, the center of gravity is adjusted. The member for adjustment does not protrude outside. Therefore, for example, an increase in size of the embedded magnet type motor can be suppressed. Moreover, it is not necessary to separately form a special hole for adjusting the center of gravity in the rotor core 8 by the above configuration. Therefore, for example, the design and shape of the rotor core 8 can be simplified, and a high magnetic torque can be maintained by securing a magnetic path necessary for obtaining the reluctance torque in the rotor core 8.

  (2) The first and second magnets 9 and 10 have the same specific gravity, and have different volumes in the axial direction, and thus different weights. Therefore, the center of gravity of the rotor 2 can be easily adjusted.

  (3) The restraining member 11 for preventing the axial movement of the first magnet 9 is provided at both axial ends in the accommodation hole 8a in which the first magnet 9 having a smaller volume than the other is disposed. Therefore, for example, the first magnet 9 whose frictional force with the rotor core 8 and the adhesive force due to the adhesive are reduced due to the small volume is prevented from coming out of the accommodation hole 8a.

(Second Embodiment)
A second embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIG. 3, the embedded magnet type motor includes a stator 21 and a rotor 22.

  The stator 21 is formed in a substantially cylindrical shape as a whole, and has a plurality of teeth 24 formed so as to extend from the inner peripheral surface of the cylindrical portion 23 forming the outer shape toward the axial center at equal circumferential intervals. The stator core 25 is provided with a winding 26 (only a part thereof is shown by a two-dot chain line in FIG. 3) wound around each tooth 24 by concentrated winding via an insulator (not shown). In the present embodiment, twelve teeth 24 are formed.

  The rotor 22 includes a rotating shaft 27, a rotor core 28, a plurality of V-shaped permanent magnets 29 as magnets, and first and second suppressing members 30 and 31 (see FIG. 4) as receiving members. In the present embodiment, eight V-shaped permanent magnets 29 are provided (that is, the number of magnetic poles is set to eight). In addition, the rotating shaft 27 of the present embodiment is connected to a load that fluctuates periodically, for example, via a cam. The rotor core 28 is formed in a substantially cylindrical shape by laminating plate materials in the axial direction, and the center of the rotary shaft 27 is fitted in the center hole thereof and is rotatably supported inside the stator 21. The rotor core 28 is formed with eight pairs of V-shaped accommodation holes 28a that are penetrated in the axial direction and are formed as a pair of substantially V-shaped accommodation holes that protrude inward in the radial direction. The V-shaped accommodation holes 28a of the present embodiment are all the same shape and are formed at equiangular intervals in the circumferential direction.

  A V-shaped permanent magnet 29 is accommodated and held in each V-shaped accommodation hole 28a. The V-shaped permanent magnet 29 is formed in a substantially V-shape that protrudes radially inward as a pair of rectangular parallelepiped permanent magnets are fitted and held in the V-shaped receiving holes 28a. The axial length of the V-shaped permanent magnet 29 is set to be shorter than the axial length of the rotor core 28 as shown in FIG. Further, the V-shaped permanent magnets 29 adjacent to each other in the circumferential direction are arranged so that their magnetic poles (the directions thereof) are alternated (reverse).

  Also, as shown in FIG. 4, first and second restraining members 30 and 31 for preventing the movement of the V-shaped permanent magnet 29 in the axial direction are fitted into both ends of the V-shaped accommodation hole 28a in the axial direction. Being held and held. Specifically, the first suppressing member 30 of the present embodiment is made of stainless steel (SUS), and the second suppressing member 31 is made of a resin material. Thereby, the specific gravity of the first suppression member 30 of the present embodiment is set to be heavier than that of the second suppression member 31. The first suppressing member 30 is fitted and held in two V-shaped receiving holes 28a (the upper V-shaped receiving holes 28a in FIGS. 3 and 4). Further, the second restraining member 31 has other six V-shaped receiving holes 28a (the left and right sides and the lower V-shaped receiving holes 28a in FIG. 3, and the lower V-shaped receiving holes in FIG. 4). 28a) is received and held. In addition, the 1st and 2nd suppression members 30 and 31 of this Embodiment are made into the same shape.

  The rotor 22 configured as described above has a different configuration in the V-shaped receiving hole 28a (in this embodiment, the upper V-shaped receiving hole 28a in FIGS. 3 and 4). The center of gravity is adjusted. That is, the weight of the first suppressing member 30 disposed in the V-shaped accommodation hole 28a (the upper V-shaped accommodation hole 28a in FIGS. 3 and 4 in the present embodiment) is different from the other V-shaped accommodation. Adjustment is made so that the center of gravity is shifted from the axial center (upward in FIGS. 3 and 4) by being heavier than the weight of the second restraining member 31 disposed in the hole 28a. Has been. Thereby, the rotation balance including the periodically fluctuating load connected to the rotating shaft 27 is made good.

Next, the characteristic operational effects of the second embodiment will be described below.
(1) The center of gravity of the rotor 22 is adjusted by making the configuration in the V-shaped receiving hole 28a (in this embodiment, the upper V-shaped receiving hole 28a in FIGS. 3 and 4) different from the others. Therefore, the member for adjusting the center of gravity does not protrude outside. Therefore, for example, an increase in size of the embedded magnet type motor can be suppressed. Moreover, it is not necessary to form a special hole for adjusting the center of gravity separately in the rotor core 28 by the above configuration. Therefore, for example, the design and shape of the rotor core 28 can be simplified, and a magnetic path necessary for obtaining the reluctance torque in the rotor core 28 can be secured to maintain a high torque.

  (2) In addition to the V-shaped permanent magnet 29, the first and second restraining members 30, 31 disposed in the V-shaped receiving hole 28a are different in material (specific gravity), so that the weights are different. Yes. Therefore, the center of gravity of the rotor 22 can be easily adjusted. Further, according to this configuration, the weight and volume of the V-shaped permanent magnet 29 (specifically, a rectangular parallelepiped permanent magnet) can be made the same as in this embodiment. That is, the number of magnets can be one.

  (3) In addition to the V-shaped permanent magnet 29, the first and second restraining members 30, 31 disposed in the V-shaped receiving hole 28a are for preventing the V-shaped permanent magnet 29 from moving in the axial direction. Therefore, the member for adjusting the center of gravity and the member for preventing the movement of the magnet in the axial direction are combined, and an increase in the number of parts is suppressed.

  (4) Since the magnet is the V-shaped permanent magnet 29 arranged in a substantially V-shape projecting radially inward, the magnet is simply a magnet compared to a curved or linear magnet arranged along the circumferential direction. Can be used a lot, and high torque can be achieved. Further, in the case of the V-shaped permanent magnet 29, the magnetic path is likely to be narrower than that of a curved or linear magnet disposed simply along the circumferential direction, and a special hole is formed as in the prior art. In particular, there is a risk that the magnetic path will be narrowed and high torque will be hindered, but there is no need to form a special hole separately, so the effect of securing the magnetic path and maintaining high torque is remarkable. It becomes.

The first and second embodiments may be implemented with the following modifications.
In the first embodiment, when the first and second magnets 9 and 10 have the same specific gravity and have different axial lengths, the volume and thus the weight are different. However, the present invention is not limited to this. For example, the width (length along the circumferential direction) in the direction perpendicular to the axis may be varied to vary the volume, and thus the weight. Further, for example, the material (specific gravity) may be made different so that the weights are different. Of course, in this case, the volumes may be the same, or the volumes may be different.

  -In the said 1st Embodiment, suppression for preventing the movement of the axial direction of the 1st magnet 9 in the axial direction both ends in the accommodation hole 8a by which the 1st magnet 9 with small volume was arrange | positioned Although the member 11 was provided, it is not limited to this, For example, the suppression member 11 may be abbreviate | omitted. If it does in this way, it can be set as the structure which does not have another member for adjusting a gravity center, for example, and can reduce a number of parts. In addition, for example, a restraining member for preventing the first and second magnets 9 and 10 from moving in the axial direction may be provided at both ends in the axial direction in all the accommodation holes 8a. In this case, it is necessary to set the axial length of the second magnet 10 longer than the first magnet 9 and shorter than the axial length of the rotor core.

  In the second embodiment, the material (specific gravity) of the first and second restraining members 30 and 31 disposed in the V-shaped accommodation hole 28a in addition to the V-shaped permanent magnet 29 is different. However, the present invention is not limited to this. For example, the same material (specific gravity) is used, and the weight is different by varying the width in the axis orthogonal direction (length along the circumferential direction). You may do it. Of course, the weights of the first and second restraining members may be different by changing the material (specific gravity) and volume.

  In the second embodiment, in addition to the V-shaped permanent magnet 29, the member to be accommodated disposed in the V-shaped housing hole 28a is a first for preventing the V-shaped permanent magnet 29 from moving in the axial direction. The second restraining members 30 and 31 are not limited to this, and are not particularly limited to this, but are changed to accommodated members that do not prevent the movement of the V-shaped permanent magnet 29 in the axial direction (that is, different in weight, ie, multiple types). May be.

  In the first and second embodiments, the magnets are linear first and second magnets 9 and 10 arranged along the circumferential direction, or are substantially V-shaped convex radially inward. Although the V-shaped permanent magnet 29 is arranged in a shape, the present invention is not limited to this, and may be changed to a curved magnet arranged along the circumferential direction, for example.

  The suppression member 11 of the first embodiment is made of a resin material, the first suppression member 30 of the second embodiment is made of stainless steel (SUS), and the second suppression member 31 is made of a resin material. However, these may be selected and used in accordance with the ratio of adjusting the center of gravity, such as copper, brass, aluminum, lead, nylon, polyacetal, PBT (polybutylene terephthalate), and the like.

  The first and second magnets 9, 10 and V are covered by covering the receiving holes 8a and the V-shaped receiving holes 28a on both axial end surfaces of the rotor cores 8 and 28 in the first and second embodiments. A plate for restricting the movement of the letter permanent magnet 29 in the axial direction may be provided.

  The center of gravity of the rotors 2 and 22 may be adjusted by making the configuration in the accommodation hole 8a (V-shaped accommodation hole 28a) different from the others, for example, the material (specific gravity) and the shape (volume) are the same. The center of gravity of the rotors 2 and 22 may be adjusted by changing the position where the magnet is disposed (for example, in the radial direction).

  In the first and second embodiments, the windings 6 and 26 are wound around the teeth 4 and 24 by concentrated winding, but are wound by distributed winding over a plurality of teeth. You may make it do.

  In the first and second embodiments, the rotor cores 8 and 28 are formed by laminating plates in the axial direction, but the present invention is not limited to this, and the rotor cores 8 and 28 are formed by other methods (for example, magnetic powders). A sintered core obtained by sintering a body) may be used.

  -The number of the teeth 4 and 24 of the said 1st and 2nd embodiment, the number of the accommodation holes 8a (V-shaped accommodation hole 28a), and the 1st and 2nd magnets 9 and 10 (V-shaped permanent magnet 29). The number etc. 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) In the interior magnet type motor according to claim 3, in order to prevent the magnet from moving in the axial direction at the axial end in the accommodation hole in which the magnet having a smaller volume than the others is disposed. An embedded magnet type motor characterized in that a suppression member is provided.

  According to this configuration, since the restraining member for preventing the axial movement of the magnet is provided at the axial end in the accommodation hole in which the magnet having a smaller volume than the other is disposed, for example, the volume is It is possible to prevent a magnet that has a small frictional force with the rotor core and an adhesive force due to the adhesive from falling out of the accommodation hole.

  (B) In the interior magnet type motor according to any one of claims 1 to 7 and (A), all the accommodation holes have the same shape and are formed at equiangular intervals in the circumferential direction. An embedded magnet type motor characterized by the above.

  According to the same configuration, in the interior magnet type motor having the rotor core having a simple shape in which all the accommodation holes have the same shape and are formed at equal angular intervals in the circumferential direction, The effect of the invention described in any one of (a) can be obtained.

1 is a partial cross-sectional view of an embedded magnet type motor according to a first embodiment. The partial cross section figure of the rotor in 1st Embodiment. The partial sectional view of the interior magnet type motor in a 2nd embodiment. The partial cross section figure of the rotor in 2nd Embodiment.

Explanation of symbols

  2, 22 ... rotor, 8, 28 ... rotor core, 8a ... receiving hole, 9, 10 ... first and second magnets, 28a ... V-shaped receiving hole (receiving hole), 29 ... V-shaped permanent magnet (magnet), 30, 31 ... 1st and 2nd suppression member (accommodated member).

Claims (8)

An embedded magnet type motor having a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction and having a rotor in which a magnet is disposed in each of the housing holes,
An embedded magnet type motor characterized in that the center of gravity of the rotor is adjusted by making the configuration in the accommodation hole different from the others. The interior magnet type motor according to claim 1,
An embedded magnet type motor characterized in that the center of gravity of the rotor is adjusted by making the weight of the magnet disposed in the accommodation hole different from the others. The interior magnet type motor according to claim 2,
An embedded magnet type motor characterized in that the center of gravity of the rotor is adjusted by making the volume of the magnet disposed in the accommodation hole different from the others. The interior magnet type motor according to any one of claims 1 to 3,
A member to be accommodated other than the magnet is disposed in the accommodation hole,
An embedded magnet type motor characterized in that the center of gravity of the rotor is adjusted by making the weight of the member to be accommodated different from others. The interior magnet type motor according to claim 4,
The embedded magnet type motor, wherein the member to be accommodated is a restraining member provided at an axial end of the accommodation hole to prevent the magnet from moving in the axial direction. In the interior magnet type motor according to claim 4 or 5,
An embedded magnet type motor wherein the center of gravity of the rotor is adjusted by making the material of the member to be accommodated different from others. The interior magnet type motor according to any one of claims 1 to 6,
The accommodation hole is a substantially V-shaped accommodation hole that is convex inward in the radial direction,
The magnet is a V-shaped permanent magnet corresponding to the V-shaped receiving hole. A rotor of an embedded magnet type motor having a rotor core in which a plurality of housing holes penetrating in the axial direction are formed in the circumferential direction, and magnets are respectively disposed in the housing holes,
A rotor of an embedded magnet type motor, characterized in that its center of gravity is adjusted by making the configuration in the accommodation hole different from others.

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