JP2005080344A - Permanent magnet type rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet type rotor which can reduce an eddy current loss. <P>SOLUTION: The permanent magnet type rotor includes an insulating film 31 made of an electric insulator provided on a surface of a split magnet 12a, and a metal plating layer 32 covering only a predetermined region brought into contact with a laminated core formed of a magnetic steel sheet or a predetermined region brought into contact with the laminated core and only a predetermined peripheral region of the predetermined region. The predetermined region brought into contact with the laminated core on the front surface 31A of the insulating film 31 is formed as a contact part 31a brought into contact with a magnet holding pawl part 22a of a salient pole 22 when the split magnet 12a is mounted between the adjacent salient poles 22 and 22 in a circumferential direction and a bent part 31b bent in a substantially protruding part in a direction toward an outer part from an inner part of the split magnet 12a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a permanent magnet type rotor.

Conventionally, a rotor yoke is formed by laminating electromagnetic steel plates such as silicon steel plates, and a plurality of slots penetrating in the rotational axis direction are provided at predetermined positions in the circumferential direction at the outer peripheral portion of the rotor yoke, and field permanent magnets are provided in the respective slots. Permanent magnet type rotors that have a metal plating layer covering the entire surface of the field permanent magnets to improve the wear resistance of the field permanent magnets are known. (For example, refer to Patent Document 1).
International Publication No. 95/33298 Pamphlet

By the way, in the permanent magnet type rotor which concerns on the prior art mentioned above, the magnetic flux density of the magnetic flux which penetrates the metal plating layer formed in the surface of the permanent magnet for fields at the time of operation of the motor which comprises this permanent magnet type rotor With the fluctuation, an eddy current is generated in the metal plating layer, and the temperature of the permanent magnet type rotor rises due to the eddy current loss caused by the eddy current.
However, in the above-described permanent magnet rotor according to the prior art, eddy current loss excessively increases in the metal plating layer covering the entire surface of the field permanent magnet, and the temperature of the permanent magnet rotor is increased. Increases excessively, and the loss in the motor increases, resulting in a decrease in operating efficiency.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a permanent magnet rotor that can reduce eddy current loss due to eddy current.

  In order to solve the above-described problems and achieve the object, the permanent magnet rotor according to the first aspect of the present invention includes a laminated core in which a plurality of electromagnetic steel plates are laminated (a laminated core in an embodiment described later). 11) a plurality of permanent magnet pieces (an embodiment to be described later) in the plurality of magnet holding portions (the rotor core 21, the salient pole portion 22, the magnet holding claw portion 22a, and the magnet mounting hole 41 in the embodiment described later). A permanent magnet rotor to which the divided magnets 12a) in the form are mounted, and a predetermined region that contacts the magnet holding portion on the surface of the permanent magnet piece (the contact portion in the embodiment described later) 31a, bent portion 31b, end surface portion 31c), or only in the predetermined region and a peripheral region of the predetermined region, a plating layer having a hardness higher than that of the laminated steel plate (metal plating layer 32 in the embodiment described later). ) It is.

  According to the permanent magnet type rotor having the above configuration, the surface of the permanent magnet piece comes into contact with the magnet holding part via the plating layer. For example, the surface of the permanent magnet piece comes into direct contact with the magnet holding part and is damaged. And the occurrence of excessive eddy current loss due to eddy currents generated in the plating layer during operation of a motor equipped with this permanent magnet rotor. Can do.

  Furthermore, in the permanent magnet type rotor of the present invention according to claim 2, the magnet holding part is a magnet mounting hole provided in the laminated core (a magnet mounting hole 41 in an embodiment described later), or A substantially cylindrical rotor core (rotor core 21 in the embodiment described later) constituting the laminated core and a plurality of salient pole portions (in the embodiment described later) projecting radially from the circumferential surface of the rotor core. Of the salient pole part 22) and an extension part (magnet holding claw part 22a in an embodiment to be described later) extending from the salient pole part in a substantially circumferential direction. Mounted in the mounting hole, or at least sandwiched from both sides in the circumferential direction by the salient pole portions adjacent in the circumferential direction, or sandwiched from both sides in the radial direction by the rotor core and the extending portion. .

According to the permanent magnet type rotor having the above-described configuration, when the permanent magnet piece is attached to the magnet attachment hole provided in the laminated core, the predetermined region on the surface of the permanent magnet piece is set, for example, as the inner wall surface of the magnet attachment hole. It is set as the area | region which contact | abuts.
Further, when the permanent magnet piece is sandwiched from both sides in the circumferential direction by at least the salient pole portions adjacent in the circumferential direction or sandwiched from both sides in the radial direction by the rotor iron core and the extending portion, the surface of the permanent magnet piece The predetermined region is defined as a region that contacts at least the salient pole portion adjacent in the circumferential direction or a region that contacts the rotor core and the extension portion.
Thereby, while ensuring the desired wear resistance for the magnet holding portion of the permanent magnet piece, the permanent magnet is caused by the eddy current loss caused by the eddy current generated in the plating layer during operation of the motor having the permanent magnet type rotor. It is possible to prevent the temperature of the rotary rotor from rising excessively.

  Furthermore, in the permanent magnet rotor according to the third aspect of the present invention, the predetermined region is a substantially convex bent protruding from the inside of the permanent magnet piece to the outside of the surface of the permanent magnet piece. It is a part (bending part 31b in embodiment mentioned later).

  According to the permanent magnet type rotor having the above-described configuration, a predetermined region on the surface of the permanent magnet piece is a bent portion that is relatively easy to contact the magnet holding portion, so that a desired magnet holding portion for the permanent magnet piece can be obtained. While ensuring wear resistance, it is possible to prevent an excessive increase in eddy current loss due to eddy current generated in the plating layer.

  Furthermore, in the permanent magnet rotor according to a fourth aspect of the present invention, the laminated core includes a plurality of laminated core portions (first core portions in the embodiments described later) divided at predetermined positions in the rotation axis direction. 11a and the second core portion 11b), and the laminated core portions adjacent in the rotation axis direction are connected to each other at a predetermined angle around the rotation axis, and are provided in the laminated core portions. The magnet holding part and the permanent magnet piece attached to the magnet holding part are shifted by the predetermined angle in the circumferential direction, and the surface of the permanent magnet piece provided in the appropriate laminated core part The predetermined region includes the appropriate laminated core in addition to the regions (abutting portions 31a and bent portions 31b in the embodiments described later) that are in contact with the magnet holding portion provided in the appropriate laminated core portion. Other said laminate adjacent to the part Is characterized in that the magnet holding portion is provided in the A section comprises a contacting area (end face 31c in the embodiment described below).

  According to the permanent magnet type rotor of the above configuration, the laminated core portions adjacent in the rotation axis direction are connected in a state shifted by a predetermined angle around the rotation axis. In the case where the end portion in the rotation axis direction of the magnet holding portion provided in the other laminated core portion is in contact with the end portion in the rotation axis direction of the permanent magnet piece provided in the one laminated core portion, For example, it is possible to prevent the surface of the permanent magnet piece from coming into direct contact with the magnet holding portion to cause damage, wear, or the like, and to occur in the plating layer during operation of the motor having the permanent magnet rotor. An excessive increase in eddy current loss due to eddy current can be prevented.

  Furthermore, the permanent magnet type rotor of the present invention according to claim 5 includes an insulating layer (insulating film 31 in an embodiment described later) that covers the surface of the permanent magnet piece with an electrical insulator, The plating layer is provided on the surface of the insulating layer.

  According to the permanent magnet type rotor having the above-described configuration, eddy currents independently generated in each electromagnetic steel sheet and plating layer constituting the laminated core are prevented from being conducted to each other via the permanent magnet, and eddy current conduction is achieved. It can be prevented that the eddy current loss due to the eddy current is excessively increased due to the relatively long path.

According to the permanent magnet type rotor of the present invention as set forth in claim 1, it is possible to prevent the surface of the permanent magnet piece from coming into direct contact with the magnet holding portion and causing damage, wear, etc. It is possible to prevent an excessive increase in eddy current loss due to eddy current generated in the plating layer during operation of a motor including a permanent magnet rotor.
Furthermore, according to the permanent magnet type rotor of the present invention as set forth in claim 2, the operation of the motor including the permanent magnet type rotor is ensured while ensuring the desired wear resistance to the magnet holding portion of the permanent magnet piece. It is possible to prevent the temperature of the permanent magnet rotor from excessively rising due to eddy current loss caused by eddy current generated in the plating layer.
Furthermore, according to the permanent magnet type rotor of the present invention as set forth in claim 3, the predetermined region on the surface of the permanent magnet piece is a bent portion that is relatively easy to come into contact with the magnet holding portion. Preventing excessive increase in eddy current loss due to eddy current generated in the plating layer during operation of a motor equipped with this permanent magnet type rotor while ensuring the desired wear resistance for the magnet holding part of the piece can do.
Furthermore, according to the permanent magnet type rotor of the present invention as set forth in claim 4, the laminated core portions adjacent in the rotational axis direction are connected in a state of being shifted by a predetermined angle around the rotational axis. In the connection part between the laminated core parts, the end part in the rotational axis direction of the magnet holding part provided in the other laminated core part is at the end part in the rotational axis direction of the permanent magnet piece provided in one laminated core part. Even in the case of contact, eddy currents caused by eddy currents generated in the plating layer during operation of the motor having the permanent magnet type rotor while ensuring the desired wear resistance to the magnet holding portion of the permanent magnet piece. An excessive increase in current loss can be prevented.
Furthermore, according to the permanent magnet type rotor of the present invention as set forth in claim 5, eddy currents independently generated in each electromagnetic steel sheet and plating layer constituting the laminated core are conducted to each other through the permanent magnet. It is possible to prevent the eddy current loss due to the eddy current from excessively increasing due to the relatively long eddy current conduction path.

Hereinafter, a permanent magnet type rotor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
A permanent magnet type rotor 1 according to this embodiment is disposed inside a substantially cylindrical stator 2 and is rotatable around a rotation axis O. For example, a substantially cylindrical rotor shaft 10 and a rotor shaft 10 are provided. The laminated core 11 mounted on the outer peripheral surface, a plurality of permanent magnets 12,..., 12 and end face plates 13 and 13 are provided.
The laminated core 11 is formed by laminating a plurality of electromagnetic steel plates such as silicon steel plates in the direction of the rotation axis O. For example, as shown in FIGS. 1 and 2, the substantially cylindrical rotor core 21 and the rotor core 21 are formed. And a plurality of salient pole portions 22,... 22 projecting in a substantially rectangular shape in cross-section from the outer peripheral surface toward the radially outer side at a predetermined position in the circumferential direction, and adjacent salient pole portions 22, 22 adjacent in the circumferential direction. A substantially rectangular plate-like permanent magnet 12 is mounted between the salient pole portions 22 and 22 so as to be sandwiched from both sides. Two magnet holding claws 22a and 22a projecting outward in the circumferential direction are formed on the outer peripheral side end of the salient pole part 22, and the magnets holding each other projecting from the salient pole parts 22 and 22 adjacent in the circumferential direction are formed. The claw portions 22a and 22a abut against the outer peripheral surface of the permanent magnet 12 mounted between the salient pole portions 22 and 22, and restrict the permanent magnet 12 from moving outward in the radial direction. . That is, in this permanent magnet type rotor 1, a part of the outer peripheral surface of the permanent magnet 12 is exposed toward the stator 2.
For example, as shown in FIG. 1, the laminated core 11 includes a plurality of, for example, two first core portions 11 a and two second core portions 11 b in which the plurality of salient pole portions 22,. For example, the plurality of salient pole portions 22,..., 22 included in the first core portion 11 a are in contrast to the plurality of salient pole portions 22,. These are arranged at positions shifted by a predetermined angle around the rotation axis O, and are set so as to reduce the occurrence of cogging torque. In connection with this, in the connection part of the 1st core part 11a and the 2nd core part 11b, in the rotating shaft O direction of the salient pole part 22 of each other in a part of end surface of the rotating shaft O direction of the mutual permanent magnet 12 A part of the end face of this is in contact.

For example, as shown in FIG. 1, the permanent magnet 12 includes a plurality of divided magnets 12 a,..., 12 a divided at predetermined positions along the rotation axis O direction, and the permanent magnet 12 is magnetized in the radial direction. ing. The permanent magnets 12 and 11 that are adjacent in the circumferential direction are opposite to each other, that is, the permanent magnet 12 that has the N pole on the outer peripheral side is adjacent to the permanent magnet 12 that has the S pole on the outer peripheral side. It is arranged to fit. The number of the plurality of permanent magnets 12, ..., 12 is an even number.
The two end face plates 13 and 13 are made of a nonmagnetic material such as austenitic stainless steel SUS, for example, and are disposed so as to sandwich the laminated core 11 from both sides in the direction of the rotation axis O. Each end face plate 13 has a substantially annular plate-like rotor core holding part 13a that contacts the end face of the rotor core 21 in the rotation axis O direction, and a radial direction from the outer peripheral surface at a predetermined position in the circumferential direction of the rotor core holding part 13a. A plurality of substantially magnet-shaped permanent magnet holding portions 13b,..., 13b projecting outward, and the permanent magnet holding portion 13b is in contact with the end surface of the permanent magnet 12 in the direction of the rotation axis O, The permanent magnet 12 is restricted from moving outward in the direction of the rotation axis O.

And, for example, as shown in FIG. 3, the respective surfaces of the plurality of divided magnets 12a,..., 12a constituting the permanent magnet 12 are covered with the respective surfaces, for example, heat resistance having electrical insulation. An insulating coating 31 made of an electrical insulating material such as resin is formed.
Further, on the surface 31 A of the insulating coating 31, only a predetermined area that comes into contact with the laminated core 11 made of electromagnetic steel plates, or a predetermined area that comes into contact with the laminated core 11 and a predetermined peripheral area that comes into contact with the laminated core 11. Only the metal plating layer 32 is provided so as to cover only.
The metal plating layer 32 is made of a metal such as Ni, for example, and is formed to have a higher hardness than the laminated core 11 formed of an electromagnetic steel plate.
The predetermined region in contact with the laminated core 11 on the surface 31A of the insulating coating 31 is a salient pole when the divided magnet 12a is mounted between the salient pole portions 22 and 22 adjacent in the circumferential direction as shown in FIG. 3, for example. In the region surrounded by the contact portion 31a with which the magnet holding claw portion 22a of the portion 22 abuts, the salient pole portions 22 and 22 adjacent to each other in the circumferential direction, and the rotor core 21 are substantially convex in the direction from the inside of the divided magnet 12a to the outside. In the bent part 31b bent in a shape, for example, as shown in FIG. 4, in the connection part between the first core part 11a and the second core part 11b, either the first core part 11a or the second core part 11b With respect to the insulating film 31 (for example, the insulating film 31 (11a) of the first core portion 11a shown in FIG. 4) of the divided magnet 12a (for example, the divided magnet 12a (11a) of the first core portion 11a shown in FIG. 4)). The end face part 31c with which the salient pole part 22 (for example, the salient pole part 22 (11b) of the second core part 11b shown in FIG. 4) provided on either the first core part 11a or the second core part 11b abuts. Etc. Thereby, on the surface 31A of the insulating coating 31, the contact part 31a, the bending part 31b, the end surface part 31c, the contact part 31a, the bending part 31b, the end surface part 31c, and the contact part 31a or the bending part 31b. Further, a metal plating layer 32 is formed in each peripheral region of the end face portion 31c.
The surface of the metal plating layer 32 formed on the surface 31A of the insulating coating 31 comes into contact with the laminated core 11, whereby the surface 31A of the insulating coating 31 and the laminated core 11 facing the surface 31A of the insulating coating 31 are contacted. A gap 33 having an appropriate size is formed between the surface and the surface. For example, as shown in FIGS. 3 and 4, when the metal plating layers 32 covering the contact portion 31 a, the bent portion 31 b, and the end surface portion 31 c on the surface 31 </ b> A of the insulating coating 31 are integrally formed, A gap 33 is formed between the outer peripheral surface 21A of the rotor core 21 and the surface 31A of the insulating coating 31 facing the outer peripheral surface 21A of the rotor core 21.

The permanent magnet type rotor 1 according to the present embodiment has the above-described configuration. Next, the operation during operation of the motor including the permanent magnet type rotor 1 will be described.
When a rotating magnetic field is generated by energizing a stator winding (not shown) of the stator 2 and the permanent magnet rotor 1 is rotated about the rotation axis O, a metal plating layer 32 formed on the surface 31A of the insulating coating 31 is formed. An eddy current is generated in the metal plating layer 32 as the magnetic flux density fluctuates. And the degree of the temperature rise of the permanent magnet type rotor 1 increases by the eddy current loss resulting from this eddy current.
For example, as shown in FIG. 5, in the permanent magnet rotor 1 according to the above-described embodiment (for example, the example shown in FIG. 5), for example, when the metal plating layer 32 is omitted (for example, comparative example 1 shown in FIG. 5). As compared with the above, the degree of temperature rise of the permanent magnet rotor 1 corresponding to the motor operating time is increased by the eddy current loss caused by the eddy current generated in the metal plating layer 32.
In the permanent magnet rotor 1 according to the above-described embodiment (for example, the example shown in FIG. 5), the metal plating layer 32 is formed only in a predetermined region on the surface 31A of the insulating coating 31. Compared with the case where the metal plating layer 32 covering the entire surface 31A of the insulating coating 31 is formed (for example, Comparative Example 2 shown in FIG. 5), the eddy current loss due to the eddy current generated in the metal plating layer 32 is reduced. It becomes smaller and the degree of temperature rise of the permanent magnet rotor 1 corresponding to the operation time of the motor becomes smaller.

As a method for manufacturing the permanent magnet type rotor 1 according to the above-described embodiment, in particular, as a method for mounting the permanent magnet 12 on the laminated core 11, for example, the split magnet 12a including the insulating coating 31 and the metal plating layer 32 is used. The circumferential dimension (width) is formed to be slightly larger than the distance between the salient pole parts 22 adjacent to each other in the circumferential direction, and the radial dimension (thickness) of the segmented magnet 12a is set to the salient pole part. A plurality of divided magnets 12a are formed in a region surrounded by the salient pole portions 22 and 22 and the rotor core 21 that are adjacent to each other in the circumferential direction. , ..., 12a are press-fitted.
At the time of press-fitting, since the metal plating layer 32 is provided on the surface 31 A of the insulating coating 31 in the region that contacts the laminated core 11, the insulating coating 31 is directly applied to the salient pole portion 22 and the rotor core 21. The abutting is prevented, and the split magnet 12a can be mounted without damaging the insulating coating 31.

  As described above, according to the permanent magnet type rotor 1 according to the present embodiment, lamination is performed on the surface 31A of the insulating coating 31 that covers the surfaces of the plurality of divided magnets 12a,. By providing the metal plating layer 32 only in the region in contact with the core 11, for example, the laminated core 11 to which the permanent magnet 12 is mounted is provided as compared with the case where a metal plating layer covering the entire surface 31 </ b> A of the insulating coating 31 is provided. Eddy current loss due to eddy current generated in the metal plating layer 32 can be reduced without impairing the wear resistance against the temperature, and the temperature rise and iron loss of the permanent magnet rotor 1 can be reduced. The motor having the permanent magnet rotor 1 can be operated with low loss and high efficiency.

In the above-described embodiment, the metal plating layers 32 that cover the contact portion 31a, the bent portion 31b, and the end surface portion 31c on the surface 31A of the insulating coating 31 are integrally formed. For example, the metal plating layers 32 that cover the portions 31a, 31b, and 31c on the surface 31A of the insulating coating 31 may be formed independently of each other. For example, the portions 31a and 31a on the surface 31A of the insulating coating 31 may be formed. The metal plating layers 32 covering 31b and 31c may be integrally formed in an appropriate combination.
For example, in the permanent magnet rotor 1 according to the first modification of the above-described embodiment shown in FIG. 6, the contact portion 31a and the bent portion 31b on the surface 31A of the insulating coating 31 are covered on the outer peripheral side of the divided magnet 12a. The metal plating layer 32 to be formed and the metal plating layer 32 covering the bent portion 31b on the surface 31A of the insulating coating 31 are formed independently of each other on the inner peripheral side of the divided magnet 12a. Thereby, in the permanent magnet rotor 1 according to the first modified example, in addition to the region between the outer peripheral surface 21A of the rotor core 21 and the surface 31A of the insulating coating 31, the side surface 22A of the salient pole portion 22; Between the surface 31A of the insulating coating 31 facing the side surface 22A of the salient pole portion 22, a gap portion 33 is formed in a region where the metal plating layer 32 is omitted.
Further, for example, in the permanent magnet type rotor 1 according to the second modification of the above-described embodiment shown in FIG. 7, the magnet of the salient pole portion 22 in the peripheral region of the bent portion 31 b on the surface 31 </ b> A of the insulating coating 31. A metal plating layer 32 is formed in a region in contact with the holding claw portion 22a or the outer peripheral surface 21A of the rotor iron core 21. Thereby, in the permanent magnet type rotor 1 according to the second modification, in addition to the region between the outer peripheral surface 21A of the rotor core 21 and the surface 31A of the insulating coating 31, the side surface 22A of the salient pole portion 22; A gap portion 33 is formed between the surface 31A of the insulating coating 31 facing the side surface 22A of the salient pole portion 22.

  In the above-described embodiment, the plurality of divided magnets 12a,..., 12a are press-fitted into the region surrounded by the salient pole portions 22, 22 and the rotor core 21 adjacent in the circumferential direction. For example, after the plurality of divided magnets 12a,..., 12a having the insulating coating 31 and the metal plating layer 32 are mounted in the region surrounded by the salient pole portions 22 and 22 and the rotor core 21 adjacent in the circumferential direction, for example. For example, the divided magnets 12a may be fixed by filling the gaps 33 with an adhesive such as silicon rubber supplied in liquid form and cured (vulcanized) at room temperature.

In the embodiment described above, the substantially cylindrical rotor core 21 is provided with a plurality of salient pole portions 22,..., 22 and a plurality of divided magnets between the salient pole portions 22, 22 adjacent in the circumferential direction. Although the permanent magnet 12 comprised by 12a, ..., 12a was mounted | worn, it is not limited to this, For example, the permanent magnet-type rotor 1 which concerns on the 3rd modification of embodiment mentioned above shown in FIG. As described above, in the vicinity of the outer peripheral portion of the substantially cylindrical rotor core 21, a plurality of magnet mounting holes 41,... 12 may be mounted. In this case, unlike the permanent magnet rotor 1 according to the above-described embodiment, the outer peripheral surface of the permanent magnet 12 is not exposed toward the stator 2.
In the permanent magnet rotor 1 according to the third modification, for example, as shown in FIG. 9, a metal plating layer 32 that covers the bent portion 31b on the surface 31A of the insulating coating 31 on the outer peripheral side of the divided magnet 12a, The metal plating layer 32 that covers the bent portion 31b on the surface 31A of the insulating coating 31 may be formed integrally with each other on the inner peripheral side of the split magnet 12a. For example, as shown in FIG. The metal plating layer 32 that covers the bent portion 31b on the surface 31A of the insulating coating 31 on the outer peripheral side of the insulating film 31 and the metal plating layer 32 that covers the bent portion 31b on the surface 31A of the insulating coating 31 on the inner peripheral side of the divided magnet 12a. And may be formed independently of each other.
In the permanent magnet type rotor 1 according to the third modification, the outer peripheral side inner surface 41A and the inner peripheral side inner surface 41B of the magnet mounting hole 41, and the insulating coating facing these outer peripheral side inner surface 41A or inner peripheral side inner surface 41B. A gap 33 is formed between the surface 31A of the metal 31 and, further, for example, as shown in FIG. 10, a metal plating layer 32 that covers the bent portion 31b on the surface 31A of the insulating coating 31 on the outer peripheral side of the divided magnet 12a. When the metal plating layer 32 covering the bent portion 31b on the surface 31A of the insulating coating 31 is formed independently of each other on the inner peripheral side of the divided magnet 12a, the circumferential inner surface 41C of the magnet mounting hole 41 is formed. A gap 33 is formed in a region where the metal plating layer 32 is omitted between the surface 31A of the insulating coating 31 facing the circumferential inner surface 41C.

  When manufacturing the permanent magnet rotor 1 according to the third modification, for example, the divided magnet 12a including the insulating coating 31 and the metal plating layer 32 is formed slightly larger than the magnet mounting hole 41, and the magnet mounting is performed. A plurality of divided magnets 12a,..., 12a may be press-fitted into the hole 41, or after the plurality of divided magnets 12a,..., 12a having the insulating coating 31 and the metal plating layer 32 are mounted in the magnet mounting hole 41. Alternatively, for example, an adhesive such as silicon rubber supplied in liquid form and cured (vulcanized) at normal temperature may be filled in the gap 33 to fix the divided magnets 12 a in the magnet mounting holes 41.

It is a perspective view which decomposes | disassembles and shows the principal part of the permanent magnet type rotor which concerns on embodiment of this invention. FIG. 2 is a ¼ circle plan view of a motor including the permanent magnet rotor shown in FIG. 1. It is sectional drawing which expands and shows the principal part of the permanent magnet type rotor shown in FIG. FIG. 3 is an enlarged plan view showing a main part of an end surface of a first core part in a connection part between a first core part and a second core part that constitute a laminated core of the permanent magnet rotor shown in FIG. 1. It is a figure which shows the temperature change of the permanent magnet type rotor with respect to the driving | running time of a motor according to the presence or absence of the metal plating layer with respect to the permanent magnet with which a permanent magnet type rotor is equipped, and the difference in the coating state of a metal plating layer. It is sectional drawing which expands and shows the principal part of the permanent-magnet-type rotor which concerns on the 1st modification of embodiment of this invention. It is sectional drawing which expands and shows the principal part of the permanent-magnet-type rotor which concerns on the 2nd modification of embodiment of this invention. It is a 1/4 circle top view of the motor which comprises the permanent magnet type rotor which concerns on the 3rd modification of embodiment of this invention. It is sectional drawing which expands and shows the principal part of the permanent-magnet-type rotor which concerns on the 3rd modification of embodiment of this invention. It is sectional drawing which expands and shows the principal part of the permanent-magnet-type rotor which concerns on the 3rd modification of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent magnet type rotor 11 Laminated core 11a 1st core part (laminated core part)
11b 2nd core part (laminated core part)
12 Permanent magnet 12a Split magnet (permanent magnet piece)
21 Rotor core (magnet holding part)
22 Salient pole part (magnet holding part)
22a Magnet holding claw part (magnet holding part, extension part)
31 Insulating coating (insulating layer)
31a Contact part (predetermined area)
31b bent part (predetermined region, bent part)
31c End face part (predetermined area)
32 Metal plating layer (plating layer)
41 Magnet mounting hole (magnet holding part, magnet mounting hole)

Claims (5)

A permanent magnet rotor in which a plurality of permanent magnet pieces are mounted on a plurality of magnet holding portions provided in a laminated core in which a plurality of electromagnetic steel plates are laminated,
Of the surface of the permanent magnet piece, a plating layer having a hardness higher than that of the laminated steel sheet is provided only in a predetermined region that contacts the magnet holding portion, or only in the predetermined region and a peripheral region of the predetermined region. Permanent magnet type rotor characterized by The magnet holding part is a magnet mounting hole provided in the laminated core, or a substantially cylindrical rotor core constituting the laminated core, and a plurality of salient pole parts protruding in a radial direction from a peripheral surface of the rotor core. And an extension portion extending in a substantially circumferential direction from the salient pole portion,
The permanent magnet piece is mounted in the magnet mounting hole, or is sandwiched at least from both sides in the circumferential direction by the salient pole portions adjacent in the circumferential direction, or both sides in the radial direction by the rotor core and the extending portion. The permanent magnet rotor according to claim 1, wherein the permanent magnet rotor is sandwiched between the two. The said predetermined area | region is the substantially convex bending part which protrudes toward the exterior from the inside of the said permanent magnet piece among the surfaces of the said permanent magnet piece, The Claim 1 or Claim 2 characterized by the above-mentioned. Permanent magnet rotor. The laminated core includes a plurality of laminated core portions divided at predetermined positions in the rotation axis direction,
The laminated core portions adjacent in the rotation axis direction are connected to each other in a state of being shifted by a predetermined angle around the rotation axis, and are attached to the magnet holding portions and the magnet holding portions provided in the laminated core portions. The permanent magnet piece is shifted in the circumferential direction by the predetermined angle,
The predetermined area on the surface of the permanent magnet piece provided in the appropriate laminated core part is not limited to the area contacting the magnet holding part provided in the appropriate laminated core part. The permanent magnet rotor according to claim 1, further comprising a region that abuts on the magnet holding portion provided in the other laminated core portion adjacent to the laminated core portion. An insulating layer covering the surface of the permanent magnet piece with an electrical insulator;
The permanent magnet type rotor according to any one of claims 1 to 4, wherein the plating layer is provided on a surface of the insulating layer.

Images