JP2007049805A - Permanent magnet type rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exactly position a permanent magnet piece in a permanent magnet type rotor. <P>SOLUTION: In the permanent magnet type rotor 1 constituted such that a rotor core 30 is formed by laminating a large number of disk-shaped steel plates having a plurality of magnet insertion holes 32 in vicinities of their external peripheries, and the permanent magnet pieces 60 are inserted into the magnet insertion holes 32: side internal walls 34, 34 at both sides in circumferential directions of the magnet insertion holes 32 are formed into tapered faces that recede from circumferential centers of the magnet insertion holes 32 as progressing toward the radial outside; cross sections of the permanent magnet 60 pieces are formed into rectangular shapes; molded resins 70 that are attached prior to insertion into the magnet insertion holes 32 are arranged at both side faces 62, 62 in the circumferential directions of the permanent magnet pieces 60; the molded resins 70 have side faces 71 that oppose the side internal walls 34 of the magnet insertion holes 32 and incline in the same directions; the permanent magnet pieces 60 having the molded resins 70 are press-inserted into the magnet insertion holes 32; and the side faces 71 of the molded resins 70 are closely contact with the side internal walls 34 of the magnet insertion holes 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a permanent magnet type rotor.

As a rotor used in a motor, a permanent magnet rotor is known that is configured by embedding a plurality of permanent magnet pieces in a rotor core made of a laminate.
In general, a permanent magnet rotor has a plurality of magnet insertion holes in a rotor core, and a permanent magnet piece is inserted and fixed in each magnet insertion hole. However, the permanent magnet piece is loose in the magnet insertion hole. If this happens, the performance of the rotor will be reduced or abnormal noise will be generated.
In order to prevent the rattling of the permanent magnet piece, a method is known in which the permanent magnet piece is positioned at a predetermined position and fixed to the magnet insertion hole with an adhesive.

For example, in Patent Document 1, a permanent magnet piece and an adhesive are inserted into a magnet insertion hole of a rotor core, and the rotor core is rotated to move the permanent magnet piece radially outward by centrifugal force, thereby positioning the rotor core. A method for fixing the permanent magnet piece by solidifying the adhesive is described.
Japanese Patent Laid-Open No. 11-252839

However, in the conventional permanent magnet piece positioning and fixing method described in Patent Document 1, when the rotor core is rotated, an adhesive is provided between the outer peripheral side inner wall of the magnet insertion hole and the outer peripheral side surface of the permanent magnet piece. May remain, and the permanent magnet piece may not be brought into close contact with the inner wall on the outer periphery side of the magnet insertion hole 32, resulting in variations in the attachment position and the attachment posture of the permanent magnet piece.
Even if the permanent magnet piece can be positioned radially outward in the magnet insertion hole once by rotation of the rotor core, the permanent magnet piece may move until the adhesive is solidified. Variations occur in the mounting position and mounting posture of the magnet pieces.
As described above, when the mounting position and mounting posture of the permanent magnet pieces vary, the magnetic flux of the permanent magnet pieces cannot be set in the radial direction of the rotor, and the parallelism of the magnetic flux is lost, thereby reducing the performance. .
Therefore, the present invention provides a permanent magnet type rotor in which the permanent magnet piece is reliably positioned at a desired position.

In order to solve the above-mentioned problem, the invention according to claim 1 is a method of laminating a plurality of disk-shaped steel plates provided with a plurality of magnet insertion openings (for example, magnet insertion holes 32 in the embodiments described later) in the vicinity of the outer periphery. Thus, a rotor core (for example, a rotor core 30 in an embodiment to be described later) is formed, and a permanent magnet piece (for example, a permanent magnet piece 60 in an embodiment to be described later) is inserted into the magnet insertion opening. In the type rotor (for example, the permanent magnet type rotor 1 in the embodiments described later), the side inner walls (for example, the side inner walls 34 in the embodiments described later) on both sides in the circumferential direction of the magnet insertion opening have a diameter. The taper is formed in a tapered surface that moves away from the circumferential center of the magnet insertion opening as it goes outward or inward, and the permanent magnet piece has a rectangular cross-sectional shape, on both sides of the permanent magnet piece in the circumferential direction. A mold resin portion (for example, a mold resin portion 70 in the embodiment described later) attached in advance before being inserted into the magnet insertion opening is provided on the side surface 62 (for example, the side surface 62 in the embodiment described later). The portion has a tapered surface (for example, a side surface 71 in an embodiment described later) that faces the inner wall of the side portion of the magnet insertion opening and is inclined in the same direction, and the permanent magnet piece provided with the mold resin portion is the magnet. It is press-fitted into the insertion opening, and the taper surface of the mold resin portion is in close contact with the side inner wall of the magnet insertion opening.
With this configuration, the permanent magnet piece is moved radially outward or inward by the taper action when the taper surface of the mold resin portion and the taper surface of the inner wall of the circumferential side portion of the magnet insertion opening are pressed against each other. Therefore, the permanent magnet piece can be reliably positioned and fixed radially outside or inside in the magnet insertion opening, and rattling of the permanent magnet piece can be prevented.

The invention according to claim 2 is the invention according to claim 1, wherein the circumferential minimum width of the permanent magnet piece is larger than the circumferential minimum width of the magnet insertion opening, and the permanent magnet piece has a circumferential maximum width. Between the side surface on the small width side (for example, the inner peripheral side surface 61 in the embodiment described later) and the inner wall on the circumferential minimum width side of the magnet insertion opening (for example, the inner peripheral side inner wall 33 in the embodiment described later). Is filled with resin.
By comprising in this way, the taper effect | action by the taper surface of a mold resin part and the taper surface of the circumferential direction side part inner wall of the opening part for magnet insertion can be exhibited reliably. In addition, since the resin is filled in the gap between the side surface on the circumferential side minimum width side of the permanent magnet piece and the inner wall on the circumferential side minimum width side of the magnet insertion opening, it is possible to reliably prevent rattling of the permanent magnet piece. be able to.

The invention according to claim 3 is a rotor core (for example, described later) by laminating a number of disk-shaped steel plates provided with a plurality of magnet insertion openings (for example, magnet insertion holes 132 in the embodiments described later) in the vicinity of the outer periphery. And a permanent magnet rotor (for example, to be described later) in which a permanent magnet piece (for example, the permanent magnet piece 160 in an embodiment to be described later) is inserted into the magnet insertion opening. In the permanent magnet type rotor 100A) in the embodiment, the permanent magnet piece is moved radially outward by rotating the rotor core while a previously weakly magnetized permanent magnet piece is inserted into the magnet insertion opening. And magnetically attached to the inner wall on the outer peripheral side of the opening for inserting the magnet (for example, the outer peripheral side inner wall 135 in the embodiment described later), and the side surface on the inner peripheral side of the permanent magnet piece (for example, the embodiment described later) A resin (for example, a resin layer 170 in an embodiment described later) between the inner peripheral side surface 161) and an inner wall on the inner periphery side of the magnet insertion opening (for example, an inner wall 133 in an embodiment described later). ), And the permanent magnet piece is strongly magnetized.
By comprising in this way, a permanent magnet piece can be reliably positioned and fixed to a radial direction outer side in the opening part for magnet insertion, and the play of a permanent magnet piece can be prevented. In addition, the permanent magnet piece can be attached in a posture parallel to the axis of the rotor iron core.

In the invention according to claim 4, a rotor core (for example, described later) is formed by laminating a large number of disk-shaped steel plates provided with a plurality of magnet insertion openings (for example, magnet insertion holes 132 in the embodiments described later) in the vicinity of the outer periphery. And a permanent magnet rotor (for example, implementation described later) in which a permanent magnet piece (for example, 260A, 260B in the embodiment described later) is inserted into the magnet insertion opening. In the permanent magnet rotor 100B) in the example, the pair of permanent magnet pieces is arranged by inserting a pair of weakly magnetized permanent magnet pieces so that the same magnetic poles face each other and inserting them into the magnet insertion opening. Are urged in a direction away from each other by a repulsive force due to the magnetic force, and magnetically attached to the inner wall of the magnet insertion opening, and a resin (for example, described later) is placed in the gap between the pair of permanent magnet pieces. After filling the resin layer 270) in the permanent magnet type rotor, characterized in that formed by strongly magnetized the permanent magnet pieces.
With this configuration, the permanent magnet pieces can be positioned and fixed securely in close contact with the inner walls spaced apart from each other in the magnet insertion opening, and rattling of the permanent magnet pieces can be prevented. In addition, the permanent magnet piece can be attached in a posture parallel to the axis of the rotor iron core.

The invention according to claim 5 is the invention according to claim 4, wherein the pair of permanent magnet pieces are formed such that surfaces facing each other are tapered surfaces inclined with respect to the radial direction of the rotor core. And
With this configuration, when the pair of weakly magnetized permanent magnet pieces is inserted into the magnet insertion opening, the permanent magnet pieces can be biased in a direction away from each other in the radial direction and the circumferential direction.

  According to the first aspect of the present invention, the permanent magnet piece can be reliably positioned and fixed radially outside or inside in the magnet insertion opening, and rattling of the permanent magnet piece can be prevented. Further, since the permanent magnet piece does not rattle in the magnet insertion opening, the permanent magnet piece does not hit the inner wall of the magnet insertion opening when the rotor is rotated, and the generation of abnormal noise can be prevented. . Furthermore, since the permanent magnet piece does not collide with the inner wall of the magnet insertion opening, it is possible to prevent the permanent magnet piece from cracking.

  According to the invention which concerns on Claim 2, the taper effect | action by the taper surface of the mold resin part and the taper surface of the circumferential direction side part inner wall of the opening part for magnet insertion can be exhibited reliably. In addition, since the resin is filled in the gap between the side surface on the circumferential side minimum width side of the permanent magnet piece and the inner wall on the circumferential side minimum width side of the magnet insertion opening, it is possible to reliably prevent rattling of the permanent magnet piece. Therefore, the generation of abnormal noise can be prevented more reliably.

According to the invention which concerns on Claim 3, a permanent magnet piece can be reliably positioned and fixed to radial direction outer side in the opening part for magnet insertion, and the play of a permanent magnet piece can be prevented. Furthermore, since the permanent magnet piece does not collide with the inner wall of the magnet insertion opening, it is possible to prevent the permanent magnet piece from cracking. Further, since the permanent magnet piece can be fixed radially outside in the magnet insertion opening, the permanent magnet piece of the rotor can be arranged close to the stator, and the magnetic force of the permanent magnet piece can be used effectively. can do.
Further, since the permanent magnet piece can be mounted in a posture parallel to the axis of the rotor iron core, the magnetic flux of the permanent magnet piece can be generated in the radial direction of the rotor, and the parallelism of the magnetic flux is maintained, and the rotor Improved performance.

According to the fourth aspect of the present invention, the permanent magnet piece can be securely positioned and fixed in close contact with the inner walls spaced apart from each other in the magnet insertion opening, and rattling of the permanent magnet piece can be prevented. . Furthermore, since the permanent magnet piece does not collide with the inner wall of the magnet insertion opening, it is possible to prevent the permanent magnet piece from cracking.
Further, since the permanent magnet piece can be mounted in a posture parallel to the axis of the rotor iron core, the magnetic flux of the permanent magnet piece can be generated in the radial direction of the rotor, and the parallelism of the magnetic flux is maintained, and the rotor Improved performance.
According to the fifth aspect of the present invention, when the pair of weakly magnetized permanent magnet pieces is inserted into the magnet insertion opening, the permanent magnet pieces can be urged away from each other in the radial direction and the circumferential direction. Therefore, the permanent magnet piece can be positioned at the corner in the magnet insertion opening.

Embodiments of a permanent magnet rotor according to the present invention will be described below with reference to the drawings of FIGS.
[Example 1]
First, a first embodiment of a permanent magnet type rotor according to the present invention will be described with reference to FIGS. FIG. 1 is a front view of a permanent magnet rotor (hereinafter abbreviated as a rotor) 1 according to a first embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
The rotor 1 mainly includes a rotor shaft 10, a pair of end face plates 20 </ b> A and 20 </ b> B, a rotor core 30, a plurality of permanent magnetic pole pieces 60, and a collar 25. In FIG. 1, the end face plate 20B and the collar 25 are omitted.
The rotor shaft 10 has a cylindrical core mounting portion 11 to which the rotor core 30 is attached. An annular locking portion 12 extending radially outward is provided on one end side in the axial direction of the core mounting portion 11. Is provided.

  End face plates 20A and 20B are made of a non-magnetic material such as austenitic stainless steel SUS304, for example, have a disk shape, and a hole formed in the center thereof is press-fitted into core mounting portion 11 of rotor shaft 10. Therefore, the inner diameter is slightly smaller than the outer diameter of the iron core mounting portion 11. The end face plate 20A is press-fitted into the outer periphery of the core mounting portion 11 and abutted against the locking portion 12, and the end face plate 20B cooperates with the end face plate 20A to sandwich the rotor core 30 so as to sandwich the outer periphery of the core mounting portion 11. It is press-fitted into. The end face plates 20 </ b> A and 20 </ b> B block both ends of the magnet insertion hole 32 of the rotor core 30 and prevent the permanent magnet piece 60 from coming out of the magnet insertion hole 32. The collar 25 that is press-fitted into the core mounting portion 11 and installed outside the end plate 20B prevents the end plates 20A and 20B and the rotor core 30 from being detached from the rotor shaft 10.

The rotor core 30 is configured by laminating a large number of disk-shaped silicon steel plates (electromagnetic steel plates). In the center of the rotor iron core 30, a through hole 31 into which the iron core mounting portion 11 of the rotor shaft 10 is press-fitted is provided. The rotor core 30 is fixed to the rotor shaft 10 by press-fitting the core mounting portion 11 into the through hole 31.
A plurality of salient pole portions 41 and groove portions 42 are alternately provided on the outer peripheral portion of the rotor core 30, and each salient pole portion 41 has a magnet insertion hole (magnet insertion opening) 32 penetrating in the axial direction. Is provided. That is, in the vicinity of the outer periphery of the rotor core 30, a plurality of magnet insertion holes 32 into which the permanent magnet pieces 60 are inserted are provided at equal intervals in the circumferential direction. In all the laminated plates constituting the rotor core 30, the magnet insertion holes 32 have the same shape. As shown in FIG. 3, the inner peripheral side inner wall 33 and the outer peripheral side inner wall 35 of the magnet insertion hole 32 are formed on a flat surface. The side inner walls 34, 34 on both sides in the circumferential direction of the magnet insertion hole 32 are formed with tapered surfaces that move away from the circumferential center of the magnet insertion hole 32 as it goes radially outward. A permanent magnet piece 60 is inserted into each magnet insertion hole 32.

  The permanent magnet piece 60 has a plate shape with a rectangular cross-sectional shape. The side surfaces 62 and 62 on both sides in the circumferential direction of the permanent magnet piece 60 are formed with a mold resin portion 70 having a triangular cross-sectional shape formed by resin molding. Is provided. The mold resin portion 70 is provided in advance on the side surface 62 of the permanent magnet piece 60 before the permanent magnet piece 60 is inserted into the magnet insertion hole 32. The side surfaces 71, 71 on both sides in the circumferential direction of the mold resin portion 70 are arranged to face the side inner walls 34, 34 of the magnet insertion hole 32, and are formed in tapered surfaces that are inclined in the same direction as the side inner walls 34 facing each other. . That is, each side surface 71 is formed as a tapered surface that moves away from the center in the circumferential direction of the permanent magnet piece 60 as it goes radially outward. The taper angle of the side inner wall 34 and the taper angle of the side surface 71 are set to be substantially the same.

As is apparent from FIG. 3, the dimensional relationship between the permanent magnet piece 60 and the magnet insertion hole 32 is larger than the circumferential width of the inner circumferential side inner wall 33 of the magnet insertion hole 32. The direction width is larger. In other words, the circumferential minimum width of the permanent magnet piece 60 is larger than the circumferential minimum width of the magnet insertion hole 32. The radial height of the magnet insertion hole 32 is larger than the radial height of the permanent magnet piece 60, and both ends of the inner peripheral side surface 61 of the permanent magnet piece 60 are the side inner walls 34 of the magnet insertion hole 32. , 34, the outer peripheral side surface 63 of the permanent magnet piece 60 is dimensioned so as to be in close contact with the outer peripheral side inner wall 35 of the magnet insertion hole 32. Then, in a state where the permanent magnet piece 60 is inserted into the magnet insertion hole 32, the mold resin portions 70, 70 are in close contact with the side inner wall 34 and the outer peripheral side inner wall 35 of the magnet insertion hole 32 in a state of being elastically compressed.
If the portion of the mold resin portion 70 is also made of a permanent magnet piece without providing the mold resin portion 70, a pointed portion (pointed end portion) is formed in the permanent magnet piece, and magnetic lines concentrate on the pointed end portion to generate heat. This is not the case with the permanent magnet piece 60 of the first embodiment.

The manufacturing method of the rotor 1 will be briefly described. First, the end face plate 20A is press-fitted into the iron core mounting part 11 of the rotor shaft 10 and attached to the locking part 12, and the rotor iron core 30 is further attached to the iron core mounting part. 11 to press fit.
Next, permanent magnet pieces 60 having mold resin portions 70 and 70 on both sides are press-fitted into the magnet insertion holes 32 of the rotor core 30. At this time, a reaction force of elastic compression of the mold resin portion 70 during press-fitting acts on the side inner wall 34, and the side inner wall 34 of the magnet insertion hole 32 and the side surface 71 of the mold resin portion 70 are inclined in the same direction. Therefore, the permanent magnet piece 60 is moved radially outward by the taper action, and the outer peripheral side surface 63 of the permanent magnet piece 60 is in close contact with the outer peripheral side inner wall 35 of the magnet insertion hole 32 as shown in FIG. . Thereby, the permanent magnet piece 60 can be reliably positioned and fixed radially outward in the magnet insertion hole 32, and the play of the permanent magnet piece 60 can be prevented.
Thereafter, the end face plate 20B is press-fitted into the iron core mounting portion 11 to be brought into close contact with the rotor core 30, and the collar 25 is press-fitted into the iron core mounting portion 11 and pressed against the end face plate 20B, whereby the rotor 1 is completed.

  According to the rotor 1, the permanent magnet piece 60 can be reliably positioned and fixed radially outward in the magnet insertion hole 32, and rattling of the permanent magnet piece 60 can be prevented. In addition, since the permanent magnet piece 60 does not rattle in the magnet insertion hole 32, the permanent magnet piece 60 does not hit the inner wall of the magnet insertion hole 32 when the rotor 1 is rotated, thereby preventing the generation of abnormal noise. And the quietness of a rotating electrical machine (for example, a motor) provided with the rotor 1 can be improved. Further, since the permanent magnet piece 60 does not collide with the inner wall of the magnet insertion hole 32, the permanent magnet piece 60 is not cracked. Further, since the permanent magnet piece 60 is fixed radially outside in the magnet insertion hole 32, the permanent magnet piece 60 is arranged close to a stator (not shown) arranged outside the rotor 1. Therefore, the magnetic force of the permanent magnet piece 60 can be used effectively, and the performance of a rotating electrical machine (for example, a motor) provided with the rotor 1 can be improved.

  After the permanent magnet piece 60 having the mold resin portion 70 is inserted into the magnet insertion hole 32, the permanent magnet piece 60 is formed between the inner peripheral side surface 61 of the permanent magnet piece 60 and the inner peripheral side inner wall 33 of the magnet insertion hole 32. It is also possible to fill the gap 39 with resin and solidify it, or to insert a spacer. If it does in this way, the permanent magnet piece 60 can be made immovable more reliably, and the play of the permanent magnet piece 60 can be prevented reliably.

A modification of the rotor 1 of the first embodiment will be described with reference to FIGS. 4 to 7.
In the rotor 1 of Modification 1 shown in FIG. 4, a pair of magnet insertion holes 32, 32 are provided side by side in the circumferential direction in the salient pole part 41 of the rotor core 30, and the mold resin part 70 is provided in each magnet insertion hole 32. The permanent magnet piece 60 provided with is attached. That is, this is an example in which the permanent magnet piece 60 of Example 1 is divided into two and each is mounted in the dedicated magnet insertion hole 32. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same mode portions and the description thereof is omitted.

In the rotor 1 of Modification 2 shown in FIG. 5, an arc-shaped concave curve that bulges outward in the circumferential direction from the tapered surface of the side inner wall 34 at the radially outer end of the side inner wall 34 in the magnet insertion hole 32. A portion 36 is formed, and a part of the mold resin portion 70 bulges out in the concave curved portion 36. Since other configurations are the same as those of the first modification described above, the same reference numerals are given to the same mode portions, and descriptions thereof are omitted. In the rotor 1 of this modification 2, since the concave portion 36 is provided in the magnet insertion hole 32, it is possible to prevent stress from concentrating on the end of the outer peripheral side inner wall 35 of the magnet insertion hole 32, The mechanical strength of the outer peripheral portion of the rotor core 30 can be increased.
In the rotor 1 of Modification 3 shown in FIG. 6, the side surfaces 62 on both sides in the circumferential direction of the permanent magnet piece 60 are formed in an arc shape, and the holding force for the mold resin portion 70 is strengthened. Since the other configuration is the same as that of the second modification described above, the same reference numeral is given to the same mode portion, and the description is omitted.

In the rotor of Modification 4 shown in FIG. 7, the side inner walls 34, 34 on both sides in the circumferential direction of the magnet insertion hole 32 are formed on tapered surfaces that move away from the center in the circumferential direction of the magnet insertion hole 32 as it goes radially inward. The side surfaces 71 and 71 on both sides in the circumferential direction of the mold resin portion 70 are also formed with tapered surfaces that move away from the circumferential center of the permanent magnet piece 60 as it goes radially inward. Further, side surfaces 62 on both sides in the circumferential direction of the permanent magnet piece 60 are formed in an arc shape. In the rotor 1 of the modified example 4 configured as described above, the permanent magnet piece 60 is positioned closer to the inside in the radial direction by the taper action of the side inner wall 34 of the magnet insertion hole 32 and the side surface 71 of the mold resin portion 70. The inner peripheral side surface 61 of the permanent magnet piece 60 can be fixed in close contact with the inner peripheral side inner wall 33 of the magnet insertion hole 32.
In addition, in the rotor 1 of the first embodiment including the first to fourth modifications, the permanent magnet piece 60 can be divided in the axial direction and inserted into the magnet insertion hole 32.

[Example 2]
Next, a second embodiment of the permanent magnet type rotor according to the present invention will be described with reference to the drawings of FIGS. FIG. 8 is a front view of a permanent magnet type rotor (hereinafter abbreviated as “rotor”) 100A according to the second embodiment, and FIG. 9 is a cross-sectional view taken along line BB in FIG.
The rotor 100A mainly includes a rotor shaft 110, a pair of end face plates 120A and 120B, a rotor core 130, a plurality of permanent magnetic pole pieces 160, a resin layer 170, and a collar 125. In FIG. 8, the end face plate 120B and the collar 125 are omitted.
The rotor shaft 110 has a cylindrical core mounting portion 111 to which the rotor core 130 is attached. An annular locking portion 112 extending radially outward is provided at one end side in the axial direction of the core mounting portion 111. Is provided.

  The end face plates 120A and 120B are made of a nonmagnetic material such as austenitic stainless steel SUS304, for example, have a disk shape, and a hole formed in the center thereof is press-fitted into the core mounting portion 111 of the rotor shaft 110. Therefore, the inner diameter is slightly smaller than the outer diameter of the iron core mounting portion 111. The end face plate 120A is press-fitted into the outer periphery of the core mounting portion 111 and abuts against the locking portion 112, and the end face plate 120B cooperates with the end face plate 120A to sandwich the rotor core 130 so as to sandwich the outer periphery of the core mounting portion 111. It is press-fitted into.

The rotor core 130 is configured by laminating a large number of disk-shaped silicon steel plates (electromagnetic steel plates). In the center of the rotor core 130, a through hole 131 into which the core mounting portion 111 of the rotor shaft 110 is press-fitted is provided. The rotor core 130 is fixed to the rotor shaft 110 by press-fitting the core mounting portion 111 into the through hole 131.
In the vicinity of the outer periphery of the rotor core 130, a plurality of magnet insertion holes (magnet insertion openings) 132 into which the permanent magnet pieces 160 are inserted are arranged at equal intervals in the circumferential direction. The magnet insertion hole 132 has a rectangular cross-sectional shape and penetrates the rotor core 130 in the axial direction.
A permanent magnet piece 160 is inserted into each magnet insertion hole 132. The permanent magnet piece 160 has a plate shape with a rectangular cross-sectional shape, the radial height is smaller than the radial height of the magnet insertion hole 132, and the circumferential width is smaller than the circumferential width of the magnet insertion hole 32. The permanent magnet piece 160 is attached with its outer peripheral side surface 163 closely attached to the outer peripheral side inner wall 135 of the magnet insertion hole 132, and the inner peripheral side inner surface 133 of the permanent magnet piece 160 and the inner peripheral side inner wall 133 of the magnet insertion hole 132. The resin layer 170 is formed without a gap therebetween.

  The end face plate 120 </ b> B is provided with a resin filling hole 121 that communicates with each resin layer 170. The end face plates 120 </ b> A and 120 </ b> B block both ends of the magnet insertion hole 132 of the rotor core 130 and prevent the permanent magnet piece 160 from coming out of the magnet insertion hole 132. The collar 125 press-fitted into the core mounting portion 111 and installed outside the end face plate 120B prevents the end face plates 120A and 120B and the rotor core 130 from being detached from the rotor shaft 110.

Next, a method for manufacturing the rotor 100A according to the second embodiment will be described with reference to FIGS.
When the rotor 100A is manufactured, the permanent magnet piece 160 is weakly magnetized in advance in the height direction (radial direction) before being inserted into the magnet insertion hole 132. In this application, “weakly magnetized” means sufficiently weaker than the magnetic force required for the permanent magnet piece 160 of the rotor 100A as a final finished product, and is lightly magnetized (due to the magnetic force) on the rotor core 130. The degree of magnetization that can secure a magnetic force that can be adsorbed). On the other hand, the magnetization strength capable of ensuring the strength of the magnetic force necessary for the permanent magnet piece 160 of the rotor 100A as the final finished product is referred to as “strong magnetization” in this application.

First, the end face plate 120 </ b> A is press-fitted into the iron core mounting part 111 of the rotor shaft 110 and attached in a state of abutting against the locking part 112, and the rotor iron core 130 is press-fitted into the iron core mounting part 111.
Next, as shown in FIG. 11A, a permanent magnet piece 160 that has been weakly magnetized in advance is inserted into the magnet insertion hole 132 of the rotor core 130. In this case, when inserting into the magnet insertion hole 132, it is not necessary to unify all the directions of the magnetic poles of the permanent magnet piece 160 in the same direction, but it is preferable to unify them. FIG. 11A shows an example in which all of the permanent magnet pieces 160 are unified with the N pole on the radially outer side and the S pole on the radially inner side. At this stage, since the permanent magnet piece 160 is weakly magnetized, it is not positioned only by being inserted into the magnet insertion hole 132, and the posture of the permanent magnet piece 160 is also uneven.
Thereafter, the end face plate 120B is press-fitted into the iron core mounting portion 111 and brought into close contact with the rotor core 130, the collar 125 is press-fitted into the iron core mounting portion 111 and pressed against the end face plate 120B, and the rotor is temporarily assembled (FIG. 10). (See (a)).

Next, the temporarily assembled rotor is rotated about the axis of the rotor shaft 110, and the permanent magnet piece 160 is drawn radially outward by centrifugal force. Then, since the permanent magnet piece 160 is weakly magnetized, the outer peripheral side surface 163 of the permanent magnet piece 160 is brought into close contact with the outer peripheral side inner wall 135 of the magnet insertion hole 132 and is magnetically attached to the rotor core 130 (FIG. 10B). ) And FIG. 11 (b)). As a result, the permanent magnet piece 160 is reliably positioned radially outward in the magnet insertion hole 132 and is in a posture parallel to the axis of the rotor shaft 110.
After that, the resin layer 170 is formed by filling the resin into the magnet insertion holes 132 from the resin filling holes 121 of the end face plate 120 </ b> B without any gaps and solidifying the resin. Since the permanent magnet piece 160 remains magnetized on the outer peripheral side inner wall 135 of the magnet insertion hole 132 during the period from the resin filling to solidification, the permanent magnet piece 160 does not move. Further, since the resin is filled and solidified in a state where the outer peripheral side surface 163 of the permanent magnet piece 160 is in close contact with the outer peripheral side inner wall 135 of the magnet insertion hole 132, the resin is interposed between the outer peripheral side surface 163 and the outer peripheral side inner wall 135. Does not flow.
Next, each permanent magnet piece 160 is strongly magnetized in the strength and direction required for the rotor 100A, thereby completing the rotor 100A.

  According to the rotor 100A, the permanent magnet piece 160 can be reliably positioned and fixed radially outward in the magnet insertion hole 132, and rattling of the permanent magnet piece 160 can be prevented. In addition, since the permanent magnet piece 160 does not rattle in the magnet insertion hole 132, the permanent magnet piece 160 does not hit the inner wall of the magnet insertion hole 132 when the rotor 100A is rotated, and noise generation is prevented. And the quietness of a rotating electrical machine (for example, a motor) provided with the rotor 100A can be improved. Further, since the permanent magnet piece 160 does not collide with the inner wall of the magnet insertion hole 132, the permanent magnet piece 160 is not cracked. Further, since the permanent magnet piece 160 is fixed radially outside in the magnet insertion hole 132, the permanent magnet piece 160 is arranged close to a stator (not shown) arranged outside the rotor 100A. Thus, the magnetic force of the permanent magnet piece 160 can be used effectively, and the performance of the rotating electrical machine (for example, a motor) provided with the rotor 100A can be improved.

In addition, if resin exists between the outer peripheral side surface 163 of the permanent magnet piece 160 and the outer peripheral side inner wall 135 of the magnet insertion hole 132, the permanent magnet piece 160 compresses the resin by centrifugal force by the rotation of the rotor 100A. However, there is a possibility that the resin sags over time and a gap is formed, and the permanent magnet piece 160 starts to rattle. However, in the rotor 100A of the second embodiment, the resin is between the outer peripheral side surface 163 and the outer peripheral side inner wall 135. Since it does not exist, such a problem does not occur.
Furthermore, since the permanent magnet piece 160 can be attached in a posture parallel to the axis of the rotor iron core 30, the magnetic flux of the permanent magnet piece 60 can be generated in the radial direction of the rotor 100A, and the parallelism of the magnetic flux is maintained. be able to. As a result, the performance of the rotor 100A is improved, and the performance of a rotating electrical machine (for example, a motor) provided with the rotor 100A can be improved.

Example 3
Next, a third embodiment of the permanent magnet rotor according to the present invention will be described with reference to the drawings of FIGS. 12 is a front view of a permanent magnet rotor (hereinafter abbreviated as “rotor”) 100B according to the third embodiment, and FIG. 13 is a cross-sectional view taken along a line CC in FIG.
The rotor 100B mainly includes a rotor shaft 110, a pair of end face plates 120A and 120B, a rotor core 130, a plurality of permanent magnetic pole pieces 260A and 260B, a resin layer 270, and a collar 125. In FIG. 13, the end face plate 120B and the collar 125 are omitted.
Since the rotor shaft 110, the end face plates 120A and 120B, the rotor core 130, and the collar 125 are the same as those of the rotor 100A of the second embodiment, the same reference numerals are given to the same mode portions and the description thereof is omitted.
The rotor 100B of the third embodiment is different from the rotor 100A of the second embodiment in the permanent magnet pieces 260A and 260B and the resin layer 270.

In the rotor 100B of the third embodiment, a pair of permanent magnet pieces 260A and 260B having the same shape and the same dimensions are attached to each magnet insertion hole 132 so as to face each other in the radial direction. The permanent magnet pieces 260 </ b> A and 260 </ b> B have a rectangular plate shape in cross section, and the circumferential width of the permanent magnet pieces 260 </ b> A and 260 </ b> B is smaller than the circumferential width of the magnet insertion hole 132.
The permanent magnet piece 260A arranged on the radially outer side is attached with its outer peripheral side surface 263a in close contact with the outer peripheral side inner wall 135 of the magnet insertion hole 132, and the permanent magnet piece 260B arranged on the radially inner side is The inner peripheral side surface 261 b is attached in close contact with the inner peripheral side inner wall 133 of the magnet insertion hole 132. In addition, a substantially semicircular concave groove 264 is formed at a position facing each other at substantially the center in the circumferential direction of the inner peripheral side surface 261a of the permanent magnet piece 260A and the outer peripheral side surface 263b of the permanent magnet piece 260B. The inner peripheral side surface 261a of the piece 260A and the outer peripheral side surface 263b of the permanent magnet piece 260B are spaced apart from each other by a predetermined dimension, and the resin layer 270 is formed without any gap therebetween. The resin filling hole 121 of the end face plate 120 </ b> B is continuous with the resin layer 270.

Next, a method for manufacturing the rotor 100B according to the third embodiment will be described with reference to FIGS. FIG. 15 is an enlarged view of a part of FIG.
When the rotor 100B is manufactured, the permanent magnet pieces 260A and 260B are weakly magnetized in advance in the height direction (radial direction) before being inserted into the magnet insertion hole 132. The definitions of “weakly magnetized” and “strongly magnetized” are the same as those in the second embodiment.
First, the end face plate 120 </ b> A is press-fitted into the iron core mounting part 111 of the rotor shaft 110 and attached in a state of abutting against the locking part 112, and the rotor iron core 130 is press-fitted into the iron core mounting part 111.

Next, as shown in FIGS. 14 and 15, the permanent magnet pieces 260 </ b> A and 260 </ b> B that have been weakly magnetized in advance are inserted into the magnet insertion hole 132 of the rotor core 130 so that the same magnetic poles face each other. To do. In the example shown in FIGS. 14 and 15, the permanent magnet piece 260A disposed on the radially outer side has the S pole on the inner circumferential side and the N pole on the outer circumferential side, and the permanent magnet piece 260B disposed on the radially inner side has the inner circumference. The S poles of the permanent magnet pieces 260A and 260B are opposed to each other with the N pole as the side and the S pole as the outer peripheral side.
When the same magnetic poles are arranged so as to face each other, the permanent magnet pieces 260A and 260B are biased in a direction away from each other by the repulsive force of the magnetic force, and the permanent magnet pieces 260A are attracted to the outer side in the radial direction. 263a is in close contact with the outer peripheral side inner wall 135 of the magnet insertion hole 132 and is magnetically attached to the rotor core 30, while the permanent magnet piece 260B is drawn radially inward, and the inner peripheral side surface 261b is connected to the inner periphery of the magnet insertion hole 132. The rotor core 30 is magnetically attached in close contact with the side inner wall 133. Accordingly, the permanent magnet pieces 260A and 260B are reliably positioned radially outside and inside in the magnet insertion hole 132 and are in a posture parallel to the axis of the rotor shaft 110.

Thereafter, when the resin is filled from the resin filling holes 121 of the end face plate 120B into the magnet insertion holes 132, the resin flows to the back along the concave grooves 264 and 264 of the permanent magnet pieces 260A and 260B, and the permanent magnet pieces 260A. , 260B without gaps. In this state, the resin is solidified to form the resin layer 170. Since the permanent magnet pieces 260A and 260B remain magnetically attached to the outer peripheral side inner wall 135 and the inner peripheral side inner wall 133 of the magnet insertion hole 132 during the period from the resin filling to solidification, the permanent magnet pieces 260A and 260B move. There is nothing. Further, the outer peripheral side surface 263a of the permanent magnet piece 260A is brought into close contact with the outer peripheral side inner wall 135 of the magnet insertion hole 132, and the inner peripheral side surface 261b of the permanent magnet piece 260B is brought into close contact with the inner peripheral side inner wall 133 of the magnet insertion hole 132. Since the resin is filled and solidified in the state, the resin does not flow between the outer peripheral side surface 263a and the outer peripheral side inner wall 135 and between the inner peripheral side surface 261b and the inner peripheral side inner wall 133.
Next, each permanent magnet piece 260A, 260B is strongly magnetized in the strength and direction required for the rotor 100B, thereby completing the rotor 100B.

  According to this rotor 100B, the permanent magnet pieces 260A and 260B can be reliably positioned and fixed radially outside and inside in the magnet insertion hole 132, and rattling of the permanent magnet pieces 260A and 260B can be prevented. can do. Further, since the permanent magnet pieces 260A and 260B do not rattle in the magnet insertion hole 132, the permanent magnet pieces 260A and 260B do not hit the inner wall of the magnet insertion hole 132 when the rotor 100B is rotated, and noise is generated. Can be prevented, and the quietness of a rotating electrical machine (for example, a motor) provided with the rotor 100B can be improved. Further, since the permanent magnet pieces 260A and 260B do not collide with the inner wall of the magnet insertion hole 132, the permanent magnet pieces 260A and 260B are not cracked.

  Furthermore, since the permanent magnet pieces 260A and 260B can be mounted in a posture parallel to the axis of the rotor shaft 110, the magnetic flux of the permanent magnet pieces 260A and 260B can be generated in the radial direction of the rotor 100B, and the magnetic flux Parallelism can be maintained. As a result, the performance of the rotor 100B is improved, and the performance of a rotating electrical machine (for example, a motor or the like) provided with the rotor 100B can be improved.

A modification of the rotor 100B of the third embodiment will be described with reference to FIGS. 16 to 18 are views corresponding to FIG. 15 and show a semi-finished product state before the resin layer 170 is formed.
In the rotor 100B of Modification 1 shown in FIG. 16, a pair of permanent magnet pieces 260A and 260B are arranged in the magnet insertion hole 132 so as to face each other in the circumferential direction, and the permanent magnet piece 260A arranged on the left side in the drawing. The left side surface 262a of the permanent magnet piece 260B is in close contact with the left side inner wall 134 in the magnet insertion hole 132, and the right side surface 265b of the permanent magnet piece 260B arranged on the right side in the drawing is in close contact with the right side inner wall 134 of the magnet insertion hole 132. A resin layer 170 (not shown) is formed between the right side surface 265a of the permanent magnet piece 260A and the left side surface 262b of the permanent magnet piece 260B. In addition, the radial height of the permanent magnet pieces 260A and 260B and the radial height of the magnet insertion hole 132 are substantially the same, and the permanent magnet pieces 260A and 260B can slide in the circumferential direction in the magnet insertion hole 132. The dimensions are set.

  When the rotor 100B is manufactured, the permanent magnet pieces 260A and 260B are weakly magnetized in advance in the width direction (circumferential direction) before being inserted into the magnet insertion hole 132 and inserted into the magnet insertion hole 132. Sometimes, the weakly magnetized permanent magnet pieces 260A and 260B are arranged so that the same magnetic poles face each other. In the example shown in FIG. 16, the permanent magnet piece 260A arranged on the left side in the drawing has the left side surface 262a as the N pole and the right side surface 265a as the S pole, and the permanent magnet piece 260B arranged on the right side in the drawing has the left side surface 262b. The S poles of the permanent magnet pieces 260A and 260B are opposed to each other with the S pole and the right side surface 265b as the N pole.

  When the same magnetic poles are arranged so as to face each other, the permanent magnet pieces 260A and 260B are biased in a direction away from each other by the repulsive force of the magnetic force, and the permanent magnet pieces 260A are attracted to the left side in the drawing, and the left side surface 262a. Is in close contact with the left side inner wall 134 of the magnet insertion hole 132 and is magnetically attached to the rotor core 30. On the other hand, the permanent magnet piece 260 B is drawn to the right side in the drawing, and the right side surface 265 b is connected to the right side of the magnet insertion hole 132. The rotor core 30 is magnetically attached in close contact with the inner wall 134. Thereby, the permanent magnet pieces 260 </ b> A and 260 </ b> B can be reliably positioned on both the left and right sides in the magnet insertion hole 132. The process after the positioning of the permanent magnet pieces 260A and 260B is the same as described above. The space between the permanent magnet pieces 260A and 260B is filled with resin and solidified, and the permanent magnet pieces 260A and 260B are strongly magnetized. The rotor 100B is completed.

The rotor 100B of the second modification shown in FIG. 17 is a further modification of the rotor 100B of the first modification shown in FIG. 16, and the rotor 100B of the second modification is different from the rotor 100B of the first modification. The point is that the radial height of the magnet insertion hole 132 is larger than the radial height of the permanent magnet pieces 260A and 260B, and the right side surface 265a of the permanent magnet piece 260A and the left side surface of the permanent magnet piece 260B facing each other. 262b is a tapered surface inclined in the same direction with respect to the height direction of the permanent magnet pieces 260A and 260B (that is, the rotor iron core 130 is in the radial direction).
In this way, when the weakly magnetized permanent magnet pieces 260A and 260B are inserted into the magnet insertion holes 132, the permanent magnet pieces 260A and 260B are biased in a direction away from each other in the circumferential direction and the radial direction. Therefore, the permanent magnet pieces 260A and 260B can be positioned at the corners of the magnet insertion hole 132. In the example shown in FIG. 17, the permanent magnet piece 260 </ b> A is positioned in close contact with the inner peripheral side inner wall 133 and the left side inner wall 134 of the magnet insertion hole 132, and the permanent magnet piece 260 </ b> B is aligned with the outer peripheral side inner wall 135 of the magnet insertion hole 132. It can be positioned in close contact with the right side inner wall 134.

A rotor 100B of Modification 3 shown in FIG. 18 is obtained by further modifying the rotor 100B of Modification 2 shown in FIG. 17, and the rotor 100B of Modification 3 is different from the rotor 100B of Modification 2. The points are the left side inner wall 134 of the left side surface 262a of the permanent magnet piece 260A and the magnet insertion hole 132 facing it, and the right side surface 265b of the permanent magnet piece 260B and the right side of the magnet insertion hole 132 facing it. The side inner wall 134 has a tapered surface that is inclined in the same direction with respect to the height direction of the permanent magnet pieces 260A and 260B and the magnet insertion hole 132 (that is, the rotor core 130 is in the radial direction).
In this way, when the weakly magnetized permanent magnet pieces 260A and 260B are positioned in the magnet insertion hole 132, the permanent magnet pieces 260A and 260B are reliably moved to the corners of the magnet insertion hole 132 by the taper action. be able to.

It is a front view of Example 1 in the permanent magnet type rotor concerning this invention. It is AA sectional drawing of FIG. It is a principal part enlarged view of FIG. It is a partial front view in the modification 1 of the permanent magnet type rotor of the said Example 1. FIG. It is a partial front view in the modification 2 of the permanent magnet type rotor of the said Example 1. FIG. It is a partial front view in the modification 3 of the permanent magnet type rotor of the said Example 1. FIG. It is a partial front view in the modification 4 of the permanent-magnet-type rotor of the said Example 1. FIG. It is a front view of Example 2 in the permanent magnet type rotor concerning this invention. It is BB sectional drawing of FIG. FIG. 10 is a partial cross-sectional view for explaining a method for manufacturing the permanent magnet rotor of the second embodiment. 6 is a front view for explaining a method of manufacturing the permanent magnet type rotor of Example 2. FIG. It is a front view of Example 3 in the permanent magnet type rotor concerning this invention. It is CC sectional drawing of FIG. 6 is a front view for explaining a method of manufacturing the permanent magnet type rotor of Example 3. FIG. It is a principal part enlarged view of FIG. FIG. 16 is a view corresponding to FIG. 15 in Modification 1 of the permanent magnet rotor of the third embodiment. FIG. 16 is a view corresponding to FIG. 15 in a second modification of the permanent magnet rotor of the third embodiment. FIG. 16 is a view corresponding to FIG. 15 in Modification 3 of the permanent magnet rotor of the third embodiment.

Explanation of symbols

1,100A, 100B Permanent magnet rotor 30, 130 Rotor core 32, 132 Magnet insertion hole (magnet insertion opening)
33 Inner peripheral side inner wall 34 Side inner walls 60, 160, 260A, 260B Permanent magnet piece 61 Inner peripheral side surface 62 Side surface 70 Mold resin portion 71 Side surface (tapered surface)
133 Inner peripheral side inner wall 135 Outer peripheral side inner wall 161 Inner peripheral side surface 170, 270 Resin layer

Claims (5)

In a permanent magnet rotor in which a large number of disk-shaped steel plates provided with a plurality of magnet insertion openings in the vicinity of the outer periphery are laminated to form a rotor core, and a permanent magnet piece is inserted into the magnet insertion opening. ,
Side inner walls on both sides in the circumferential direction of the magnet insertion opening are formed as tapered surfaces that move away from the center in the circumferential direction of the magnet insertion opening as it goes radially outward or inward, and the sectional shape of the permanent magnet piece Is formed in a rectangular shape, and side surfaces on both sides in the circumferential direction of the permanent magnet piece are provided with a mold resin portion that is attached in advance before being inserted into the magnet insertion opening, and the mold resin portion corresponds to the magnet insertion opening. A permanent magnet piece having a taper surface facing the inner wall of the side portion and inclined in the same direction is press-fitted into the magnet insertion opening, and the taper surface of the mold resin portion is used for the magnet insertion. A permanent magnet type rotor characterized by being in close contact with a side inner wall of an opening.   The circumferential minimum width of the permanent magnet piece is larger than the circumferential minimum width of the magnet insertion opening, and the side surface on the circumferential minimum width side of the permanent magnet piece and the circumferential minimum width side of the magnet insertion opening. The permanent magnet rotor according to claim 1, wherein a resin is filled between the inner wall and the inner wall of the permanent magnet rotor. In a permanent magnet rotor in which a large number of disk-shaped steel plates provided with a plurality of magnet insertion openings in the vicinity of the outer periphery are laminated to form a rotor core, and a permanent magnet piece is inserted into the magnet insertion opening. ,
An inner wall on the outer peripheral side of the magnet insertion opening by rotating the rotor iron core in a state in which a weakly magnetized permanent magnet piece is inserted into the magnet insertion opening to bring the permanent magnet piece radially outward The permanent magnet piece is strongly magnetized after the resin is filled between the inner peripheral side surface of the permanent magnet piece and the inner peripheral side inner wall of the magnet insertion opening. Permanent magnet type rotor characterized by In a permanent magnet rotor in which a large number of disk-shaped steel plates provided with a plurality of magnet insertion openings in the vicinity of the outer periphery are laminated to form a rotor core, and a permanent magnet piece is inserted into the magnet insertion opening. ,
A direction in which a pair of weakly magnetized permanent magnet pieces are arranged so that the same magnetic poles face each other and are inserted into the magnet insertion opening so that the pair of permanent magnet pieces are separated from each other by the repulsive force of the magnetic force. The magnet is magnetically attached to the inner wall of the magnet insertion opening, filled with a resin in the gap between the pair of permanent magnet pieces, and then the permanent magnet piece is strongly magnetized. Permanent magnet rotor.   5. The permanent magnet rotor according to claim 4, wherein surfaces of the pair of permanent magnet pieces facing each other are formed as tapered surfaces inclined with respect to a radial direction of the rotor core.

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