TWI791292B - Rotors for Internal Permanent Magnet Motors - Google Patents

Abstract

In the rotor for an inner permanent magnet motor, the rotor magnet can be easily inserted into the magnet insertion hole, and movement of the rotor magnet in the magnet insertion hole can be suppressed. The rotor (2) for an inner permanent magnet (IPM) motor has: a plurality of disk-shaped rotor core members (24), which are stacked in the thickness direction to form a cylindrical rotor core (21), and the rotor core The portion has a magnet insertion hole (23) penetrating in an axial direction; and a rotor magnet (22) inserted into the magnet insertion hole (23). At least one of the plurality of rotor core members (24) has: a protrusion (55) constituting a part of the inner edge of the magnet insertion hole (23) and connected to the rotor magnet (22) inserted into the magnet insertion hole (23) ) contact; and a deformation allowing portion (60), which is located opposite to the magnet insertion hole (23) across at least one of the contact portions (55) in a top view of the rotor core member (24) viewed from the thickness direction side, and allow deformation of the protrusion (55).

Description

Rotors for Internal Permanent Magnet Motors

The invention relates to a rotor for an inner permanent magnet motor.

There is known an IPM motor (Interior Permanet Magnet Motor) having a structure in which permanent magnets are embedded in a rotor. Patent Document 1 discloses an IPM motor in which magnet insertion holes are located in the rotor core of the rotor at equiangular intervals along the circumferential direction, and permanent magnets are inserted into the magnet insertion holes.

The permanent magnet is fixed inside the magnet insertion hole by being sandwiched between a leaf spring portion protruding from an inner wall surface of the magnet insertion hole and an inner wall surface of the magnet insertion hole. prior art literature patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2015-76956

In the IPM motor disclosed in Patent Document 1, when the permanent magnet is inserted into the magnet insertion hole, the leaf spring receives the same reaction force as when it is fixed in the magnet insertion hole. Therefore, in the configuration of Patent Document 1, a large force is required to insert the rotor magnet, which is the permanent magnet, into the magnet insertion hole.

In addition, when the rotor core and the rotor magnet are sealed with resin, the rotor magnet inserted into the magnet insertion hole tends to be displaced due to the flow of the resin.

An object of the present invention is to provide a rotor having a structure capable of easily inserting a rotor magnet into a magnet insertion hole and suppressing movement of the rotor magnet in the magnet insertion hole.

A rotor for an IPM motor according to an embodiment of the present invention has a plurality of disk-shaped rotor core members, and a plurality of the rotor core members are stacked in the thickness direction to form a cylindrical rotor core. The portion has a magnet insertion hole penetrating in an axial direction; and a rotor magnet inserted into the magnet insertion hole. At least one of the plurality of rotor core members has: a contact portion constituting a part of an inner edge of the magnet insertion hole and in contact with the rotor magnet inserted into the magnet insertion hole; and a deformation allowing portion located on a side opposite to the magnet insertion hole across at least one of the contact portions in plan view of the rotor core member viewed from the thickness direction and allowing the Deformation of the contact part.

According to the rotor for an IPM motor according to one embodiment of the present invention, the rotor magnet can be easily inserted into the magnet insertion hole, and movement of the rotor magnet in the magnet insertion hole can be suppressed.

Embodiments of the present invention will be described in detail below with reference to the drawings. In addition, the same code|symbol is attached|subjected to the same or corresponding part in a figure, and the description is not repeated. In addition, the dimensions of the structural members in the drawings do not represent the actual dimensions of the structural members, the dimensional ratios of the respective structural members, and the like.

In addition, in the description of the motor 1 below, the direction parallel to the central axis P of the rotor 2 is referred to as the "axial direction", and the direction perpendicular to the central axis P is referred to as the "radial direction". The direction of the arc centered on the axis P is called "circumferential direction". However, it is not intended to limit the direction of the motor 1 in use by the definition of the above direction.

In addition, in the following description, expressions of "fixing", "connecting", and "mounting" and the like (hereinafter referred to as "fixing and the like") include not only cases where members are directly fixed to each other, but also cases where members are fixed to each other via other members. That is, in the following description, expressions such as fixing include direct and indirect fixing of members to each other.

[Embodiment 1] (Structure of motor) FIG. 1 shows a schematic configuration of a motor 1 that is an IPM motor having a rotor 2 according to an embodiment of the present invention. The motor 1 includes a rotor 2 , a stator 3 and a housing 4 . The rotor 2 is a rotor for an IPM motor in which magnets are embedded. The rotor 2 rotates about the central axis P relative to the stator 3 . In the present embodiment, the motor 1 is a so-called inner rotor type motor in which a rotor 2 is rotatably positioned in a cylindrical stator 3 around a center axis P. As shown in FIG.

The rotor 2 includes a shaft 20 , a rotor core 21 and rotor magnets 22 . The rotor 2 is located radially inside the stator 3 and can rotate relative to the stator 3 .

The rotor core 21 has a cylindrical shape extending along the central axis P. As shown in FIG. A shaft 20 extending along the central axis P is fixed to the rotor core 21 in a state penetrating in the axial direction. Thus, the rotor core 21 rotates together with the shaft 20 .

The rotor core 21 is formed by laminating a plurality of disc-shaped rotor core members 24 in the thickness direction. The plurality of rotor core members 24 are made of electromagnetic steel sheets.

The rotor core 21 has a magnet insertion hole 23 that penetrates the plurality of rotor core members 24 in the axial direction in a state in which the plurality of rotor core members 24 are laminated. When the rotor core 21 is viewed from the axial direction, the magnet insertion hole 23 has a rectangular shape.

The rotor magnets 22 are prism-shaped and rectangular when viewed along the axial direction of the rotor 2 . That is, when the rotor core member 24 is viewed from above, the rotor magnet 22 has a rectangular shape having long sides and short sides. The axial length of the rotor magnet 22 is equal to the axial length of the rotor core 21 .

Although not shown, the rotor core 21 and the rotor magnet 22 are resin-sealed in a state where the rotor magnet 22 is housed in the magnet insertion hole 23 . Thus, the rotor magnet 22 is fixed relative to the rotor core 21 . In addition, the rotor core 21 and the rotor magnet 22 may not be sealed with resin.

Hereinafter, for convenience of description, when the rotor magnet 22 is viewed in the axial direction of the rotor 2, the surface constituting the long side of the rotor magnet 22 is referred to as the long side surface of the rotor magnet 22, and the surface constituting the short side of the rotor magnet 22 is referred to as the rotor surface. The short side of the magnet 22.

The stator 3 is housed in a casing 4 . In this embodiment, the stator 3 has a cylindrical shape. The rotor 2 is located radially inside the stator 3 . That is, the stator 3 is located radially opposite to the rotor 2 . The rotor 2 is rotatably located on the inner side of the stator 3 in the radial direction around the center axis P. As shown in FIG.

The stator 3 includes a stator core 31 and a stator coil 36 . The stator core 31 has a cylindrical shape extending in the axial direction. The stator coil 36 is wound around the stator core 21 .

(rotor core member) Next, the rotor core member 24 will be described in detail using FIGS. 2 and 3 . 2 and 3 are views of the rotor core 21 constructed by laminating the rotor core members 24 viewed from the axial direction. The rotor core member 24 has a plurality of receiving holes 50 and a plurality of deformation allowing portions 60 . The housing hole 50 of the rotor core member 24 has the same shape as the magnet insertion hole 23 of the rotor core 21 when the rotor core member 24 is viewed from above.

The receiving hole 50 constitutes a part of the inner edge of the magnet insertion hole 23 of the rotor core 21 . When the rotor core member 24 is viewed from above, the housing hole 50 has a rectangular shape. In the present embodiment, the longitudinal direction of the housing hole 50 is inclined with respect to a line extending in the radial direction of the rotor core 21 . An example of a line extending in the above-mentioned radial direction is shown by a one-dot chain line in FIG. 2 .

In the present embodiment, the rotor core member 24 has sixteen housing holes 50 . Eight of the sixteen receiving holes 50 are circumferentially symmetrical with respect to the other eight receiving holes 50 . The rotor core member 24 has eight sets of circumferentially symmetrical pairs of housing holes 50 at equal intervals in the circumferential direction.

The rotor magnets 22 are housed in the respective housing holes 50 . Therefore, when the rotor magnets 22 are housed in the housing holes 50 , they are inclined with respect to a line extending in the radial direction of the rotor core member 24 when viewed in the axial direction.

As shown in FIG. 3 , the inner edge of the receiving hole 50 includes: an outer inner edge portion 51, which faces the radially outer long side of the rotor magnet 22; The edge portion 52 faces the radially inner long side of the rotor magnet 22; the outer side connects the inner edge portion 53, which faces the radially outer short side of the rotor magnet 22; and the inner side connects The inner edge portion 54 , the inner connection inner edge portion 54 faces the short side surface of the rotor magnet 22 located on the inner side in the radial direction.

The rotor core member 24 has two protrusions 55 protruding toward the inside of the housing hole 50 . In a state where the rotor magnet 22 is inserted into the housing hole 50 , at least one of the two protrusions 55 is in contact with the radially inner long side surface of the rotor magnet 22 . In this embodiment, the protruding portion 55 functions as a contact portion.

When the rotor core member 24 is viewed from above, the outer inner edge portion 51 is linear. In a state where the rotor magnet 22 is inserted into the housing hole 50 , the outer inner edge portion 51 is in contact with the radially outer long side surface of the rotor magnet 22 .

The outer connecting inner edge portion 53 has: a straight line portion 53a extending from the inner inner edge portion 52 side toward the outer inner edge portion 51; Curved outside.

The inner connecting inner edge portion 54 has: a straight line portion 54a extending from the inner inner edge portion 52 side toward the outer inner edge portion 51; Curved outside.

The position of the rotor magnet 22 in the longitudinal direction relative to the housing hole 50 is determined by the straight portion 53a and the straight portion 54a. The position of the rotor magnet 22 in the short-side direction relative to the housing hole 50 is determined by the two protrusions 55 and the outer inner edge portion 51 . Accordingly, the rotor magnets 22 are positioned at predetermined positions in the radial and circumferential directions within the magnet insertion holes 23 of the rotor core 21 .

The deformation allowing portion 60 is a through hole penetrating through the rotor core member 24 in the thickness direction. When the rotor core member 24 is viewed from above, the deformation allowing portion 60 has a rectangular shape. In the present embodiment, the rotor core member 24 has two deformation allowing portions 60 . In the rotor core member 24 , the two deformation-allowing portions 60 are located on the opposite side to the housing hole 50 across the two protrusions 55 . That is, each deformation allowing portion 60 is located radially inward of each protrusion portion 55 . In addition, it is preferable that the number of deformation-allowing parts 60 is the same as the number of protrusion parts 55 .

In addition, all the rotor core members 24 constituting the rotor core 21 may have the protruding portion 55 and the deformation-allowing portion 60 as contact portions. Thereby, the shape of the rotor core member 24 can be made into the same shape. Therefore, the manufacturing cost of the mold for the rotor core member 24 can be reduced, and the work of laminating the rotor core members 24 can be simplified. Therefore, according to the above configuration, the productivity of the rotor 2 can be improved and the production cost can be reduced.

Next, the relationship between the protruding portion 55 and the deformation allowing portion 60 will be described using FIG. 4 .

The rotor core member 24 has a deformable region R between the protruding portion 55 and the deformation allowing portion 60 . When the rotor magnet 22 is inserted into the magnet insertion hole 23 of the rotor core 21 , the region R is deformed toward the deformation-allowing portion 60 .

FIG. 4 is a diagram schematically showing deformation occurring in the region R when the rotor magnet 22 is inserted into the magnet insertion hole 23 . As shown by the solid line in FIG. 4, when the rotor magnet 22 is inserted into the housing hole 50 of the rotor core member 24, when the rotor core member 24 is viewed from a plan view, the protrusion 55 and the region R are elastically deformed to allow for deformation. The part 60 moves sideways. In addition, in FIG. 4 , for convenience of description, the amount of deformation of the region R is described in an exaggerated manner.

Therefore, when the rotor magnet 22 is inserted into the magnet insertion hole 23 of the rotor core 21 , the protrusion 55 in contact with the rotor magnet 22 can be easily displaced toward the deformation allowing portion 60 side. Therefore, the rotor magnet 22 can be easily inserted into the magnet insertion hole 23 . Further, after inserting the rotor magnet 22 into the magnet insertion hole 23 of the rotor core 21 , the protrusion 55 returns to the original position by the elastic restoring force of the region R. As shown in FIG.

In addition, in the present embodiment, the area of each deformation allowing portion 60 is smaller than the area of the housing hole 50 in plan view of the rotor core member 24 . Thereby, while ensuring the function as the deformation-allowing portion 60 for deforming the projection portion 44 , it is possible to suppress a decrease in the magnetic properties of the portion serving as the through-hole of the deformation-allowing portion 60 .

In the present embodiment, the protruding portion 55 constitutes a part of the inner edge of the magnet insertion hole 23 of the rotor core 21 , and protrudes toward the inside of the magnet insertion hole 23 in plan view of the rotor core member 24 . Accordingly, the rotor magnet 22 can be brought into contact with the protrusion 55 constituting a part of the inner edge of the magnet insertion hole 23 of the rotor core 21 . Thereby, the rotor magnet 22 can be positioned in the magnet insertion hole 23 in the radial direction.

In addition, in the present embodiment, when the rotor core member 24 is viewed from above, the rotor magnet 22 has a rectangular shape having long sides and short sides. Furthermore, in the radial direction of the rotor core member 24 , the protrusion 55 is in contact with the radially inner long side of the rotor magnet 22 , and in the radial direction of the rotor core member 24 , the deformation allowing portion 60 sandwiches the radial direction of the rotor magnet 22 . The inner long side is located on the opposite side to the radially outer long side of the rotor magnet 22 .

Accordingly, the radially outer long side of the rotor magnet 22 can be pressed against the radially outer inner edge of the magnet insertion hole 23 by the protrusion 55 . Therefore, it is possible to position the rotor magnet 22 at a position in the magnet insertion hole 23 where a larger magnetic field is generated by the rotor 2 .

As described above, the rotor 2 for the motor 1 that is the IPM motor of this embodiment has a plurality of disk-shaped rotor core members 24, and the plurality of rotor core members 24 are formed into a cylindrical shape by stacking them in the thickness direction. A rotor core 21 having a magnet insertion hole 23 penetrating in the axial direction; and a rotor magnet 22 inserted into the magnet insertion hole 23 . At least one of the plurality of rotor core members 24 has: a contact portion constituting a part of the inner edge of the magnet insertion hole 23 and in contact with the rotor magnet 22 inserted into the magnet insertion hole 23 ; and a deformation allowing portion 60 , The deformation allowing portion 60 is located on the opposite side to the magnet insertion hole 23 across at least one of the contact portions in a plan view of the rotor core member 24 in the thickness direction, and allows deformation of the contact portion.

Accordingly, the rotor magnet 22 can be housed in the magnet insertion hole 23 of the cylindrical rotor core 21 in which a plurality of rotor core members 24 are stacked in the thickness direction with the rotor magnet 22 positioned. That is, since the protrusion 55 as a contact portion contacts the rotor magnet 22 in the magnet insertion hole 23 , the rotor magnet 22 can be positioned at a predetermined position in the magnet insertion hole 23 . Therefore, even in the case where the rotor core 21 and the rotor magnet 22 are sealed by resin, the rotor magnet 22 can be suppressed from moving in the magnet insertion hole 23 .

In this manner, by positioning the rotor magnet 22 in the magnet insertion hole 23 , it is possible to suppress the occurrence of vibration and torque ripple in the motor 1 .

In addition, in each rotor core member 24, when the rotor core member 24 is viewed in a plan view, the deformation allowing portion 60 is located on the opposite side to the magnet insertion hole 23 of the rotor core 21 across the contact portion. When the rotor magnet 22 is inserted into the magnet insertion hole 23, the contact portion is easily deformed. Therefore, the rotor magnet 22 can be easily inserted into the magnet insertion hole 23 .

In addition, in the present embodiment, the above-mentioned contact portion constitutes a part of the inner edge of the inner edge of the magnet insertion hole 23 located radially inside the rotor core member 24, and the deformation allowing portion 50 is located in the rotor core member 24 than the above-mentioned contact portion. Close to the radial inner side of the rotor core member 24 .

Accordingly, the rotor magnet 22 can be pressed toward the radially outer inner edge of the magnet insertion hole 23 by the contact portion. Therefore, it is possible to position the rotor magnet 22 at a position in the magnet insertion hole 23 where a larger magnetic field is generated by the rotor 2 .

[Embodiment 2] Next, a motor according to Embodiment 2 will be described. The shapes of the housing hole 150 and the deformation allowing portion 160 of the motor according to the second embodiment are different from the shapes of the housing hole 50 and the deformation allowing portion 60 of the first embodiment. FIG. 5 is a diagram showing a schematic configuration of a rotor core 121 according to the second embodiment.

The rotor core 121 is formed by laminating a plurality of disk-shaped rotor core members 124 in the thickness direction. The rotor core 121 has magnet insertion holes 123 , and the magnet insertion holes 23 pass through the plurality of rotor core members 124 in the axial direction when the plurality of rotor core members 124 are laminated.

The rotor core member 124 has a housing hole 150 and a deformation allowing portion 160 . The receiving hole 150 constitutes a part of the inner edge of the magnet insertion hole 123 of the rotor core. In addition, the shape of the magnet insertion hole 123 of the rotor core 121 is the same as the shape of the housing hole 150 described below.

As shown in FIG. 6 , the inner edge of the receiving hole 150 includes: an outer inner edge portion 151 , the outer inner edge portion 151 faces the radially outer long side of the rotor magnet 22 ; an inner inner edge portion 152 , the inner inner edge portion 152 The edge portion 152 faces the radially inner long side of the rotor magnet 22; the outer side connects to the inner edge portion 153, and the outer side connects the inner edge portion 153 to face the radially outer short side of the rotor magnet 22; the inner side connects to the inner side. An edge portion 154, the above-mentioned inner connecting inner edge portion 154 faces the short side of the radially inner side of the rotor magnet 22; It is connected to the outer connecting inner edge portion 153 and the inner connecting inner edge portion 154 .

The two inclined portions 155 constitute a part of inner edges on both sides in the circumferential direction of the rotor core member 124 among the inner edges of the magnet insertion holes 123 of the rotor core 121 . When the rotor magnet 22 is inserted into the receiving hole 150 , the two inclined portions 155 are in contact with the corners at both ends of the inner long side surface of the rotor magnet 22 .

When the rotor core member 124 is viewed from above, the outer inner edge portion 151 is linear. In a state where the rotor magnet 22 is inserted into the housing hole 150 , the outer inner edge portion 151 is in contact with the radially outer long side surface of the rotor magnet 22 .

The position of the rotor magnet 22 in the short-side direction is determined by the outer inner edge portion 151 and the inclined portion 155 . The position of the rotor magnet 22 in the longitudinal direction is determined by the inclined portion 155 . Accordingly, the rotor magnets 22 are positioned at predetermined positions in the radial and circumferential directions within the magnet insertion holes 123 of the rotor core 121 .

The deformation allowing portion 160 is a through hole penetrating through the rotor core member 124 in the thickness direction. When the rotor core member 124 is viewed from above, the deformation allowing portion 160 has a triangular shape. In the present embodiment, rotor core member 124 has two deformation allowing portions 160 . In the rotor core member 124 , the two deformation allowing portions 160 are located on the opposite side to the housing hole 150 across the two inclined portions 155 . Both sides of the deformation allowing portion 160 extend along the long side and the short side of the rotor magnet 22 when the rotor core member 124 is viewed from above. One side of the deformation allowing portion 160 extends along the inclined portion 155 .

The rotor core member 124 has a deformable region R between the inclined portion 155 and the deformation allowing portion 160 . When the rotor magnet 22 is inserted into the magnet insertion hole 123 of the rotor core 121 , the region R is deformed toward the deformation-allowing portion 160 .

FIG. 7 is a diagram schematically showing deformation occurring in the region R when the rotor magnet 22 is inserted into the magnet insertion hole 123 . As shown by the solid line in FIG. 7 , when the rotor magnet 22 is inserted into the housing hole 50 of the rotor core member 124, when the rotor core member 124 is viewed from above, the inclined portion 155 and the region R are elastically deformed toward the deformation tolerance. The part 160 moves sideways. In addition, in FIG. 7 , for convenience of description, the amount of deformation of the region R is described in an exaggerated manner.

Therefore, similar to Embodiment 1, in this embodiment, when the rotor magnet 22 is inserted into the magnet insertion hole 123 of the rotor core 121 , the protrusion 155 that contacts the rotor magnet 22 can be made to deform by the deformation allowing portion 160 . It is easily displaced toward the deformation allowing portion 160 side. Therefore, the rotor magnet 22 can be easily inserted into the magnet insertion hole 123 .

In addition, like Embodiment 1, in this embodiment, after the rotor magnet 22 is inserted into the magnet insertion hole 123 of the rotor core part 121, the inclined part 155 also returns to the original position. In the present embodiment, the inclined portion 155 constitutes a part of the inner edge of the magnet insertion hole 123 , and extends in a direction inclined to the side of the rotor magnet 22 when the rotor core member 124 is viewed from above. Thereby, the corner portion of the rotor magnet 22 can be brought into contact with the inclined portion 155 constituting a part of the inner edge of the magnet insertion hole 123 of the rotor core portion 121 . Thereby, the rotor magnet 22 can be positioned in the magnet insertion hole 123 in the radial direction and the circumferential direction.

In addition, in the present embodiment, the inclined portion 155 constitutes a part of inner edges located on both sides in the circumferential direction among the inner edges of the magnet insertion hole 123 . By bringing the corner portion of the rotor magnet 22 into contact with such an inclined portion 155 , the rotor magnet 22 can be positioned within the magnet insertion hole 123 in the radial and circumferential directions with higher precision. Therefore, the rotor magnet 22 can be positioned in the magnet insertion hole 123 with higher precision.

As described above, in the rotor of this embodiment, the rotor magnet 22 can also be housed in a columnar shape in which a plurality of rotor core members 124 are stacked in the thickness direction in a state where the rotor magnet 22 is positioned. The magnets of the rotor core 121 are inserted into the holes 123 . That is, in the magnet insertion hole 123 , the inclined portion 155 as a contact portion contacts the rotor magnet 22 , so that the rotor magnet 22 can be positioned at a predetermined position in the magnet insertion hole 123 . Furthermore, by providing the deformation-allowing portion 160 , when the rotor magnet 22 is inserted into the magnet insertion hole 123 , the above-mentioned contact portion is easily deformed. Therefore, the rotor magnet 22 can be easily inserted into the magnet insertion hole 123 .

In addition, in the present embodiment, the deformation allowing portion 160 is also located in the rotor core member 124 on the inner side in the radial direction of the rotor core member 124 than the above-mentioned contact portion. Accordingly, the rotor magnet 22 can be pressed toward the radially outer inner edge of the magnet insertion hole 123 by the contact portion. Therefore, it is possible to position the rotor magnet 22 at a position in the magnet insertion hole 123 where a larger magnetic field is generated by the rotor.

(Other implementations) The embodiments of the present invention have been described above, but the above-described embodiments are merely examples for carrying out the present invention. Therefore, it is not limited to the said embodiment, The said embodiment can be modified suitably and implemented in the range which does not deviate from the summary.

In Embodiments 1 and 2 described above, the deformation allowing portions 60 and 160 are through holes. However, the deformation allowing portion may also be a thin portion. In this case, the deformation allowing portion may be of any structure as long as it can elastically deform when the rotor magnet is inserted into the magnet insertion hole to allow the displacement of the protrusion or the inclined portion.

In addition, the through hole, ie, the deformation allowing portion, may also be connected to the receiving hole. In this case, the deformation allowing portion also constitutes a part of the storage hole.

In addition, the configurations of Embodiments 1 and 2 described above may be combined. That is, the rotor core member may have protrusions and slopes. In this case, the rotor core member also has a deformation allowing portion that allows deformation of the protrusion and the inclined portion.

All of the sixteen receiving holes 50 , 150 included in each rotor core member 24 , 124 may have the same shape, or a part of the receiving holes may have a different shape.

In Embodiments 1 and 2 described above, the longitudinal direction of the housing holes 50 and 150 extends in a direction inclined with respect to a line extending in the radial direction of the rotor core members 24 and 124 . However, the longitudinal direction of the receiving hole may also extend in a direction perpendicular to the radial direction.

In Embodiments 1 and 2 described above, the deformation allowing portions 60 , 160 included in the respective rotor core members 24 , 124 have the same shape and are positioned at the same position with respect to the housing holes 50 , 150 . However, the deformation-allowing portion may also have a different shape. In addition, a part of the deformation allowing portion may be located at a different position with respect to the receiving holes 50 and 150 .

The plurality of rotor core members constituting the rotor core may have protrusions and deformation allowing portions at the same position when viewed from the axial direction, or may have protrusions and deformation allowing portions at different positions when viewed from the axial direction. A part of the rotor core member may not have the protrusion and the deformation-allowing portion.

The plurality of rotor core members constituting the rotor core may have the inclined portion and the deformation-allowing portion at the same position when viewed from the axial direction, or may have the deformation-allowing portion at different positions from each other. A part of the rotor core member may not have the inclined portion and the deformation-allowing portion.

In Embodiment 1 described above, the rotor core member 24 has the same number of deformation allowing portions 60 as the number of the protrusions 55 . However, the number of protrusions may also differ from the number of deformation-allowing portions.

In Embodiment 1 described above, the protrusion 55 which is the contact portion includes two protrusions. However, the number of protrusions may be one, or three or more. From the viewpoint of positioning accuracy of the rotor magnet in the magnet insertion hole, it is preferable that the protrusion includes a plurality of protrusions. The plurality of protrusions can more reliably press the rotor magnet against the inner edge of the magnet insertion hole. Therefore, the above-mentioned rotor magnet can be more reliably positioned in the above-mentioned magnet insertion hole.

In Embodiment 2 described above, the rotor core member 124 has two inclined portions located on both sides in the circumferential direction of the rotor core member 124 . However, it is also possible for the rotor core member to have only the inclined portion located on the inner side in the circumferential direction of the rotor core member. In addition, from the viewpoint of positioning accuracy of the rotor magnets in the magnet insertion holes, it is preferable that the rotor core member has two inclined portions.

In Embodiment 1 described above, the deformation allowing portion 60 has a rectangular shape. In Embodiment 2 described above, the shape of the deformation allowing portion 160 is triangular. However, the deformation allowing portion may also have a shape other than rectangular or triangular as long as the stator core member has a deformable region located between the accommodation hole and the deformation allowing portion.

In Embodiments 1 and 2 described above, the number of housing holes 50 and 150 is sixteen. However, the number of containment holes may be fifteen or less, or seventeen or more.

Industrial availability The present invention can be applied to a rotor of an IPM motor.

1: motor

2: rotor

3: Stator

4: Shell

20: axis

21, 121: rotor core

22: Rotor magnet

23, 123: magnet insertion hole

24, 124: rotor core components

31: Stator core

36: Stator coil

50, 150: containment hole

51, 151: outer inner edge

52, 152: inner inner edge

53, 153: The outer side connects to the inner edge

53a, 54a: straight line part

53b, 54b: bending part

54, 154: the inner side connects the inner edge

55: protrusion

60, 160: Deformation Allowance Department

155: inclined part

R: area

FIG. 1 is a diagram showing a schematic configuration of a motor according to Embodiment 1. FIG. FIG. 2 is a diagram showing a schematic configuration of a rotor core according to Embodiment 1. FIG. FIG. 3 is a partially enlarged view of FIG. 2 . 4 is a diagram schematically showing deformation of a rotor core when a rotor magnet is inserted into a magnet insertion hole. FIG. 5 is a diagram showing a schematic configuration of a rotor core according to Embodiment 2. FIG. FIG. 6 is a partially enlarged view of FIG. 5 . 7 is a diagram schematically showing deformation of a rotor core when a rotor magnet is inserted into a magnet insertion hole.

21: Rotor core

22: Rotor magnet

23: Magnet insertion hole

24: Rotor core component

50: containment hole

51: outer inner edge

52: Inner inner edge

53: The outer side connects to the inner edge

53a: Straight line part

53b: bending part

54: The inner side connects the inner edge

54a: Straight line part

54b: bending part

55: protrusion

60: Deformation Allowance Department

R: area

Claims (14)

A rotor for an internal permanent magnet motor, characterized in that it has: a plurality of disc-shaped rotor core members, the plurality of rotor core members are stacked in the thickness direction to form a cylindrical rotor core, the A rotor core having a magnet insertion hole penetrating in an axial direction; and a rotor magnet inserted into the magnet insertion hole, at least one of the plurality of rotor core members having: a contact portion, the contact portion constituting a part of the inner edge of the magnet insertion hole, and is in contact with the rotor magnet inserted into the magnet insertion hole, and the contact portion is deformable by insertion of the rotor magnet; The deformation allowing portion is located on a side opposite to the magnet insertion hole across at least one of the contact portions in a plan view of the rotor core member viewed from a thickness direction, and allows deformation of the contact portion, The contact portion and the deformation allowing portion are located in the same rotor core member. The rotor for an internal permanent magnet motor according to claim 1, wherein the contact portion constitutes a part of the inner edge of the magnet insertion hole located on the inner side in the radial direction of the core member, and the deformation The allowable portion is located radially inward of the contact portion in the rotor core member. The rotor for an internal permanent magnet motor according to claim 1 or 2, wherein, when viewing the rotor core member from above, the rotor magnet has a long side and short sides, the contact portion is in contact with the radially inner long side of the rotor magnet in the radial direction of the rotor core member, the deformation allowing portion is in the radial direction of the rotor core member, The radially inner long side sandwiching the rotor magnet is located on a side opposite to the radially outer long side of the rotor magnet. The rotor for an internal permanent magnet motor according to claim 1 or 2, wherein the contact portion is an inclined portion constituting a part of the inner edge of the magnet insertion hole, and the rotor core is viewed in plan view The outer member extends in a direction inclined with respect to the sides of the rotor magnets. The rotor for an internal permanent magnet motor according to claim 4, wherein the inclined portion constitutes a part of the inner edge of the magnet insertion hole located on both sides in the circumferential direction of the rotor core member. The rotor for an internal permanent magnet motor according to claim 1 or 2, wherein the contact portion is a protrusion constituting a part of the inner edge of the magnet insertion hole, and the rotor core is viewed in plan view The outer member protrudes toward the inner side of the magnet insertion hole. The rotor for an internal permanent magnet motor according to claim 6, wherein the contact portion includes a plurality of the protrusions. The rotor for an internal permanent magnet motor according to claim 1 or 2, wherein the deformation allowing portion is a through hole penetrating through the rotor core member in a thickness direction. The rotor for an internal permanent magnet motor as claimed in claim 8, wherein, The area of the through hole is smaller than the area of the magnet insertion hole when the rotor core member is viewed from above. The rotor for an internal permanent magnet motor according to claim 1 or 2, wherein all rotor core members constituting the rotor core have the contact portion and the deformation allowing portion. A rotor for an internal permanent magnet motor, characterized in that it has: a plurality of disc-shaped rotor core members, the plurality of rotor core members are stacked in the thickness direction to form a cylindrical rotor core, the A rotor core having a magnet insertion hole penetrating in an axial direction; and a rotor magnet inserted into the magnet insertion hole, at least one of the plurality of rotor core members having: a contact portion, the contact portion constituting a part of the inner edge of the magnet insertion hole and coming into contact with the rotor magnet inserted into the magnet insertion hole; The deformation allowing portion is located on a side opposite to the magnet insertion hole across at least one of the contact portions, and allows deformation of the contact portion, the contact portion including a protrusion protruding toward an inner side of the magnet insertion hole part; and a deformable region connected to the root of the protrusion and located between the protrusion and the deformation-allowing part. A rotor for an internal permanent magnet motor, characterized in that it has: a plurality of disk-shaped rotor core members which constitute a cylindrical rotor core by being stacked in a thickness direction, the rotor core having a magnet insertion hole penetrating in an axial direction; and a rotor magnet inserted into the magnet insertion hole, at least one of the plurality of rotor core members having a contact portion constituting a part of an inner edge of the magnet insertion hole, and The rotor magnet inserted into the magnet insertion hole is in contact, and the contact portion is deformable by insertion of the rotor magnet; and a deformation allowing portion, in plan view of the rotor core member viewed from the thickness direction, The deformation allowing portion is located on a side opposite to the magnet insertion hole across at least one of the contact portions, and allows deformation of the contact portion, the deformation allowing portion penetrating through the rotor core in a thickness direction. Through holes of external components. The rotor for an internal permanent magnet motor according to claim 11 or 12, wherein the contact portion constitutes a part of an inner edge of the inner edge of the magnet insertion hole located radially inward of the core member, so that The deformation allowing portion is located radially inward of the contact portion in the rotor core member. The rotor for an internal permanent magnet motor according to claim 11 or 12, wherein the contact portion includes a plurality of the protrusions.

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