JP4736028B2 - Rotor, method of manufacturing the same, and electric motor - Google Patents

Description

  The present invention relates to a method for manufacturing a rotor with a permanent magnet, such as a synchronous motor, in which a permanent magnet is fixed on a rotor outer peripheral surface.

Conventionally, in this type of technology, when the permanent magnet is equally positioned and fixed in the circumferential direction, as a conventional technology, the permanent magnet is formed by being punched at equal intervals on the circumference of the laminated core that is fitted and fixed to the shaft. A method is used in which the protrusions are used for positioning and abutting the side surfaces of the permanent magnets and bonded and fixed (for example, Patent Document 1).
FIG. 8 is a partial end view of the rotor. In FIG. 8, the side surface of the permanent magnet is positioned and abutted and fixed to the side surface of the protrusion formed at equal intervals on the outer peripheral portion of the laminated iron core that is fitted and fixed to the shaft.
As another conventional technique, there is a method of using a protrusion formed directly on a predetermined portion of a shaft by pressing or the like for positioning and bonding and fixing (for example, Patent Document 2).
FIG. 9 is a front sectional view in which a part of a rotor in another prior art is cut open. In FIG. 9, the permanent magnet is positioned and abutted and fixed by adhesion by a protrusion directly formed on the shaft.
JP-A-6-98514 (5th page, Fig. 1) JP-A-6-245417 (page 4, Fig. 1)

However, in the prior art, when positioning the permanent magnet by the projection, the circumferential dimension between the pair of projections is taken into consideration in the circumferential dimension of the permanent magnet in consideration of variation in the circumferential dimension of the permanent magnet. It is somewhat larger than. In this case, a gap is generated between the side surface opposite to the side surface of the permanent magnet that is in positioning contact and the side surface of the protruding portion facing it. In addition, in general, a thermosetting adhesive is often used for fixing, in order to prevent the permanent magnet from being lifted due to a decrease in the viscosity of the thermosetting adhesive during the heating period, In order to make the adhesive layer uniform, it is necessary to restrain the permanent magnet in advance by binding the outer periphery of the permanent magnet with a metal band or the like before heating.
At this time, the position of the permanent magnet due to the gap may occur due to this restraining force. In this case, it is necessary to correct the position of the permanent magnet by loosening the binding, etc. In this case, the productivity is lowered, and further, when the adhesive is fixed while the position is shifted, a quality problem such as deterioration of rotational characteristics occurs.
The present invention has been made in view of such problems, and is highly productive by adhering and fixing in a state in which the positional displacement of the permanent magnet does not occur even when a binding force such as binding is applied to the permanent magnet. An object of the present invention is to provide a rotor and an electric motor capable of improving quality.

In order to solve the above problems, the present invention is configured as follows.
The invention according to claim 1, a rotary shaft, a core formed by laminating the core plate projections are formed at equal intervals in the circumferential direction of the outer peripheral surface fixed to said rotary shaft, said core having a protrusion In the rotor having an iron plate laminated on the rotating shaft at both ends of the rotor and a permanent magnet fixed between the protrusions of the iron core, the iron plate has substantially the same shape as the iron core plate. And a claw portion extending in the circumferential direction from the end of the protruding portion and bent in the axial direction is provided , and one side surface in the circumferential direction of the permanent magnet contacts the claw portion, and the other side surface It is formed in contact with the protruding portion of the iron core .
According to a second aspect of the present invention, the iron plate is provided at both end portions of the iron core.
According to a third aspect of the present invention, at least two of the iron plates are provided at regular intervals during the lamination of the iron core.
According to a fourth aspect of the present invention, the positions of the iron plate and the iron core provided at the regular intervals are shifted by a certain angle in the circumferential direction.
According to a fifth aspect of the present invention, there is provided an iron core portion formed integrally with the rotation shaft and having protrusions formed at equal intervals in the circumferential direction of the outer peripheral surface, and a permanent magnet fixed between the protrusion portions of the iron core portion. In the rotor having the above, at both ends of the iron core, the shape of the protrusion is substantially the same as the shape of the protrusion of the iron core, and extends in the circumferential direction from the end of the protrusion, An iron plate provided with a claw portion bent in a direction, and one side surface of the permanent magnet in contact with the claw portion and the other side surface formed in contact with the protruding portion of the iron core. is there.
The invention according to claim 6 is a rotor having a rotating shaft, an iron core portion provided on the rotating shaft, and a permanent magnet fixed to the outer peripheral surface of the iron core portion. Protrusions are formed at equal intervals in the circumferential direction, separate from the rotating shaft, and the shape of the protrusions at both ends of the iron core is substantially the same as the shape of the protrusions of the iron core. And an iron plate extending in the circumferential direction from the end of the protruding portion, bent in the axial direction, provided with a claw portion, and one side surface in the circumferential direction of the permanent magnet is in contact with the claw portion, The other side surface is formed in contact with the protruding portion of the iron core .
A seventh aspect of the present invention is an electric motor incorporated in a stator using the rotor according to the first to sixth aspects.
According to an eighth aspect of the present invention, there is provided an iron plate in which an iron core in which protrusions are formed at equal intervals in the circumferential direction of the outer peripheral surface is fixed to a rotation shaft, and the iron plate that has the protrusions and is attached to the rotation shaft. In a method of manufacturing a rotor, which is formed, the iron plate is mounted on the rotating shaft, and a permanent magnet is bonded and fixed between the stacked core core projections, the projection of the iron plate is substantially the same as the shape of the core plate. When forming the same shape, extending in the circumferential direction from the end of the projection, bending in the axial direction, providing a claw, and bonding the permanent magnet, between the projections of the iron core Apply adhesive to at least one of the surface or the permanent magnet, position it while pressing one side of the permanent magnet to the claw part of the iron plate, and hold the permanent magnet so that it does not move in the circumferential direction To do.
According to a ninth aspect of the present invention, the positions where the iron plate is mounted on the rotating shaft are both ends of the iron core.
According to a tenth aspect of the present invention, at least two positions at which the iron plate is mounted on the rotating shaft are provided at regular intervals in the middle of the iron core.
According to an eleventh aspect of the present invention, the iron plate and the iron core provided at the regular intervals are shifted to a position at a certain angle in the circumferential direction.
According to a twelfth aspect of the present invention, the rotating shaft and the iron core are integrally formed, the protrusions are formed at equal intervals in the circumferential direction of the outer peripheral surface of the iron core, and the protrusions of the iron core and the protrusions are formed. In the manufacturing method of the rotor for fixing the permanent magnet between the two, the shape of the protrusions is substantially the same as the shape of the protrusions of the iron core at both ends of the iron core, and the ends of the protrusions A steel plate extending in the circumferential direction and bent and formed in the axial direction to provide a claw portion , one side surface of the permanent magnet in the circumferential direction abuts on the claw portion, and the other side surface is a protrusion of the iron core. It is formed in contact with .
According to a thirteenth aspect of the present invention, in the method of manufacturing a rotor in which an iron core is provided on a rotating shaft, and a permanent magnet is fixed to the outer peripheral surface of the iron core, the iron core protrudes at equal intervals in the circumferential direction of the outer peripheral surface. Forming a portion separate from the rotating shaft, and at both ends of the iron core, the shape of the protrusion is substantially the same as the shape of the protrusion of the iron core, and the end of the protrusion A steel plate extending in the circumferential direction and bent and formed in the axial direction to provide a claw portion , one side surface of the permanent magnet in the circumferential direction abuts on the claw portion, and the other side surface is a protrusion of the iron core. in a shall be formed in contact with.
A fourteenth aspect of the present invention is a method for manufacturing an electric motor incorporated in a stator using the method for manufacturing a rotor according to the eighth to thirteenth aspects.

According to the present invention, by providing an iron plate having a claw portion that extends in the circumferential direction from the end portion of the protruding portion and is bent in the axial direction, the pressing force to the opposite side surface can be maintained when the permanent magnet is mounted. The permanent magnets can be correctly bonded and fixed without any positional deviation. Therefore, a high-quality rotor and electric motor with high productivity can be obtained.
In addition, according to the inventions of claims 4 and 11, the positions of the iron plate and the iron core provided at regular intervals can be shifted in the circumferential direction, so that it is possible to form a skew in addition to the above effects. It becomes.
In addition, according to the inventions of claims 6 and 13, manufacturing is facilitated by using an iron core portion having protrusions formed at equal intervals in the circumferential direction of the outer peripheral surface, and the rotating shaft is shared. Can be made. Therefore, the cost of the rotor and the electric motor is reduced.

  Hereinafter, specific examples of the method of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a rotor showing Embodiment 1 of the present invention, and FIG. 2 is a front view thereof. In the figure, 1 is a rotor, 2 is an iron core, 3 is a rotating shaft, 4 is a permanent magnet, 5 is an iron plate, and 6 is a tape. In addition, the same code | symbol is attached | subjected to the same function in the figure. The rotor 1 of the present embodiment has a structure in which a laminated iron core 2 is provided on a rotating shaft 3 and a permanent magnet 4 is disposed on the outer periphery of the iron core 2.
The iron core 2 has a plurality of protrusions 21 formed at equal intervals in the circumferential direction of the outer peripheral surface thereof.
The shape of the iron plate 5 is shown in FIGS. FIG. 3 is a plan view before molding, and FIG. 4 is a partial perspective view of the claw portion 52 of FIG. As shown in FIG. 3, the iron plate 5 is formed into a shape having a protruding portion 51 and a claw forming portion 52 a extending in the circumferential direction from the end portion of the protruding portion 51 by pressing or the like. And the nail | claw shaping | molding part 52a is shape | molded by the nail | claw part 52 bent so that it might become a convex shape from the bending root part to the front-end | tip part at an angle of about 90 degree | times by press work etc. as shown in FIG. .
Next, a method for manufacturing the rotor of this embodiment will be described.
(1) Step 1 The iron core 2 is fixed to the rotating shaft 3.
A plurality of iron core plates are laminated so that the projections 21 are completely overlapped so that the axial dimension becomes a predetermined dimension, the iron core 2 is formed, and the rotary shaft 3 is press-fitted or fired into the inner diameter portion of the iron core 2. Insert and fix with a method such as fitting.
(2) Step 2 A pre-formed iron plate 5 is fixed to the rotating shaft 3.
The iron plate 5 is press-fitted and fixed to the rotary shaft 3 such that the protruding portions 21 are completely overlapped on both sides of the iron core 2 and the bent base portion of the claw portion 52 is positioned on the outer side in the axial direction.
(3) Process 3 The permanent magnet 4 is bonded to the iron core 2.
Adhesive is applied to the attachment surface of the permanent magnet 4 of the iron core 2 (the surface between the protrusion 21 and the protrusion 21) or the concave surface on the inner diameter side of the permanent magnet 4, and the permanent magnet 4 is attached to the iron core 2 from the axial direction. It pushes in to the predetermined position along the side surface of the protrusion 21 and the protrusion 51 of the iron plate 5. At this time, one side surface of the permanent magnet 4 is pressed against the side surface side of the protruding portion 21 of the iron core 2 by the claw portion 52, and the opposite side surface of the permanent magnet 4 is pressed against the side surface of the protruding portion 21 of the iron core 2. As a result, the circumferential displacement does not occur.
(4) Step 4 The permanent magnet 4 is bound and fixed to the iron core 2.
In order to make the adhesive layer uniform and prevent the permanent magnet 4 from being lifted up which may occur during the adhesive heating and curing process, the outer periphery of the permanent magnet 4 is bound with a metal band or the like, and the permanent magnet 4 is restrained. The adhesive is cured under conditions to complete the fixing of the permanent magnet 4 to the outer periphery of the iron core 2.
(5) Step 5 Tap the permanent magnet 4.
The surface of the permanent magnet 4 is protected by, for example, winding a thermosetting glass-containing prepreg tape 8 around the permanent magnet 4 and curing it by heating.

  In the first embodiment, when the permanent magnet 4 is bonded and fixed to the outer peripheral surface of the iron core 2 as described above, one side surface of the permanent magnet 4 is pushed to the side surface side of the protrusion 21 by the claw portion 52 and is opposite to the permanent magnet 4. The side surface is pressed against the opposite side surface of the protrusion 21. Therefore, when the outer periphery of the permanent magnet 4 is bound and restrained to prevent the permanent magnet 4 from being lifted up, which may occur during the process of uniformizing the adhesive layer and bonding heat curing, an external force due to the binding is applied to the permanent magnet 4. In addition, it is possible to prevent the circumferential displacement of the permanent magnet 4 and to save the trouble of correcting the position accompanying the displacement. In addition, it is possible to prevent quality problems caused by the permanent magnet 4 being bonded and fixed while being displaced.

  FIG. 5 is a side view of a rotor showing Embodiment 2 of the present invention. In this embodiment, the iron core in Embodiment 1 is formed integrally with the rotating shaft. In the figure, 31 is a protrusion formed from the rotary shaft 3. The protrusions 31 are formed at an equal interval in the circumferential direction of the outer peripheral surface of the iron core part, in which the iron core 2 and the rotary shaft 3 are integrally formed. The iron plate 5 is produced in the same manner as in the first embodiment, and is formed with a protrusion 51, a claw forming part 52, and a claw part 52a.

Next, a method for manufacturing the rotor of this embodiment will be described.
(1) Step 1 A protrusion 31 is formed on the rotating shaft 3.
Protrusions 31 are formed at equal intervals on the outer peripheral surface of the iron core 2 formed integrally with the rotary shaft 3 by pressing or the like.
(2) Step 2 A pre-formed iron plate 5 is press-fitted and fixed to the rotary shaft 3.
Since Step 2 to Step 5 are the same method as in Example 1, description thereof is omitted.
(3) Process 3 The permanent magnet 4 is bonded to the iron core 2.
(4) Process 4 The permanent magnet 4 is bound and fixed.
(5) Step 5 Tap the permanent magnet 4.
Thus, the same effect as Example 1 is acquired by manufacturing a rotor.
In this embodiment, the iron core 2 formed integrally with the rotary shaft 3 is used. However, a separate iron core formed with protrusions can be used instead. Thereby, since the position shift of the permanent magnet 4 in the circumferential direction can be prevented, troubles such as correction of the position accompanying the position shift can be saved.

FIG. 6 is a side view of a rotor showing Embodiment 3 of the present invention.
In the present embodiment, the laminated iron core 2 is provided on the rotary shaft 3 in the same manner as in the first embodiment, and the iron plate 5 is arranged in the middle of the lamination so that the required lamination dimension of the iron core is substantially divided into three.
The iron core 2 and the iron plate 5 are produced in the same manner as in the first embodiment.

Next, a method for manufacturing the rotor of this embodiment will be described.
(1) Process 1 The iron core 2 and the iron plate 5 are fixed to the rotating shaft 3.
Produced a laminated iron core that is divided into three pieces so that the iron plate 5 formed with the claw portion 52 is divided into three pieces so that the required laminated dimension of the iron core is roughly divided into three parts including the iron plate 5, and the iron plate 5 substantially divides the iron core 2 into three It arranges in the position to do. The laminated iron core and the iron plate 5 divided into three pieces are inserted and fixed to the rotary shaft 3 by a method such as press-fitting or shrink fitting so that the protrusion 21 and the protrusion 51 are completely overlapped. In this case, the axial direction of the iron plate 5 is not particularly limited.
(2) Process 2 The permanent magnet 4 is bonded to the iron core 2.
Since Step 2 to Step 4 are the same methods as Step 3 to Step 5 in Examples 1 and 2, description thereof will be omitted.
(3) Process 3 The permanent magnet 4 is bound and fixed.
(4) Step 4 Tap the permanent magnet 4.
By manufacturing the rotor in this way, the same effects as those of the first and second embodiments can be obtained.
In the present embodiment, the iron plate 5 is provided in the middle of the laminated core 2, but the iron plate 5 disposed on both sides of the iron core 2 in the first embodiment may be further added. In this way, the pressing force on the side surface of the permanent magnet 4 is further increased, and even if an external force is applied to the permanent magnet 4 due to the outer periphery binding of the permanent magnet 4, it is possible to firmly prevent the displacement of the permanent magnet 4 in the circumferential direction.

FIG. 7 is a side view showing Embodiment 4 of the present invention. In the present embodiment, the laminated cores divided into three as described in the third embodiment are arranged together with the iron plate 5 while being displaced by a predetermined amount in the circumferential direction.
The protruding portion 21 and the iron plate 5 of the iron core 2 are the same as those in the first and third embodiments.
Next, a method for manufacturing the rotor of this embodiment will be described.
(1) Step 1 The iron core 2 is fixed to the rotating shaft 3.
First, a plurality of iron core plates are laminated so that the axial dimension becomes a predetermined dimension so that the protrusions 21 are completely overlapped to form the first iron core 2a, and a rotating shaft is formed on the inner diameter portion of the iron core 2a. 3 is inserted and fixed by press fitting or shrink fitting.
(2) Step 2 A pre-formed iron plate 5 is press-fitted and fixed to the rotary shaft 3.
Since Steps 2 to 4 are the same methods as Steps 2 to 4 in Examples 1 and 2, description thereof is omitted.
(3) Process 3 The permanent magnet 4 is bonded to the iron core 2.
(4) Step 4 The permanent magnet 4 is bound and fixed to the iron core 2.
(5) Process 5 The iron core 2 is fixed to the rotating shaft 3.
Similarly to the first iron core 2a in step 1, a plurality of iron core plates are stacked so that the axial dimension becomes a predetermined dimension to form the second iron core 2b, and the first iron core 2a. On the other hand, the position is shifted by a predetermined amount in the circumferential direction, and the rotary shaft 3 is inserted and fixed until it hits the first iron core 2a by a method such as press fitting or shrink fitting. At this time, the iron plate 5 on the side in contact with the first iron core 2a is inserted and fixed at a predetermined position before the second iron core 2b is inserted, and the iron plate on the opposite side is inserted after the second iron core 2b is inserted and fixed. 5 is inserted and fixed. At this time, the positional relationship between the second iron core 2b and the iron plate 5 is the same as those in the first iron core 2a.
(6) Process 6
Steps 3 and 4 are repeated, and the work is performed in the same procedure as that performed for the first iron core 2a until the outer periphery of the permanent magnet 4 is bound and restrained.
(7) Process 7
Further, the same procedure as that performed for the second iron core 2b is performed until the permanent magnet 4 is constrained to the third iron core 2c, and the adhesive is cured under a predetermined condition to make the permanent magnet. 4 is fixed to the outer periphery of each iron core.
When the adhesive is heat-cured, the binding work of each iron core to the outer periphery of the permanent magnet 4 may be performed collectively after the positioning of the permanent magnet to each iron core is completed.
(8) Step 8 Tap the permanent magnet 4.
The surface of the permanent magnet 4 is protected by, for example, winding a thermosetting glass-containing prepreg tape 8 around the permanent magnet 4 and curing it by heating.

  In the fourth embodiment, the permanent magnet 4 is bonded and fixed to the outer peripheral surface of each iron core in the manufacture of the rotor configured such that a plurality of iron cores are displaced in the circumferential direction by a predetermined amount and arranged in the axial direction. At this time, one side surface of the permanent magnet 4 is pressed against the side surface side of the projection portion 21 by the claw portion 52, and the opposite side surface of the permanent magnet 4 is pressed against the opposite side surface of the projection portion 21. Therefore, when the outer periphery of the permanent magnet 4 is bound and restrained to prevent the permanent magnet 4 from being lifted up, which may occur during the process of uniformizing the adhesive layer and bonding heat curing, an external force due to the binding is applied to the permanent magnet 4. In addition, it is possible to prevent the circumferential displacement of the permanent magnet 4 and to save the trouble of correcting the position accompanying the displacement. In addition, it is possible to prevent quality problems caused by the permanent magnet 4 being bonded and fixed while being displaced.

In this embodiment, the iron plates 5 are provided at both ends of each of the laminated iron cores 2a, 2b, and 2c. However, as in the third embodiment, the iron plates 5 may be added during the lamination of the iron cores. In this way, the pressing force on the side surface of the permanent magnet 4 is further increased, and even if an external force is applied to the permanent magnet 4 due to the outer periphery binding of the permanent magnet 4, it is possible to firmly prevent the displacement of the permanent magnet 4 in the circumferential direction.
As described above, if the rotor described in the first to fourth embodiments of the present invention is used, a motor with high quality and low cost can be manufactured.

  When positioning and adhering and fixing the permanent magnet along the protrusion side provided on the outer periphery of the iron core, press one side in the circumferential direction of the permanent magnet with a pressing force applied to the side of the protrusion provided on the outer periphery of the iron core. The part that presses the opposite side of the permanent magnet so that it can be applied is provided on the iron plate on both ends of the iron core to prevent the permanent magnet from lifting up, which may occur in the process of uniforming the adhesive layer or heating the adhesive. Therefore, even if an external force such as binding is applied, it can be manufactured in a state in which no circumferential displacement occurs. Therefore, the present invention can be applied to the case where a rotor with a permanent magnet, such as a synchronous motor, is manufactured using permanent magnets whose width in the circumferential direction varies to some extent.

The side view of the rotor which shows Example 1 of this invention Front view of FIG. Front view of an iron plate before bending forming used in an embodiment of the present invention The partial perspective view which shows the projection part of FIG. The side view of the rotor which shows Example 2 of this invention The side view of the rotor which shows Example 3 of this invention The side view of the rotor which shows Example 4 of this invention Partial front view showing the iron core of a conventional rotor Front sectional view of a rotor showing another conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2, 2a, 2b, 2c Iron core 21 Protrusion part 3 Rotating shaft 31 Protrusion part 4 Permanent magnet 5 Iron plate 51 Protrusion part 52 Claw part 52a Claw molding part 6 Tape

Claims (14)

A rotating core, an iron core in which protrusions are formed at equal intervals in the circumferential direction of the outer peripheral surface fixed to the rotating shaft, and a stack having protrusions stacked on the rotating shaft at both ends of the iron core. In a rotor having an iron plate and a permanent magnet fixed between the protrusions of the iron core,
The iron plate is provided with a claw portion whose protrusion is substantially the same shape as the iron core plate, and which extends in the circumferential direction from the end of the protrusion and is bent in the axial direction .
A rotor, wherein one side surface of the permanent magnet in the circumferential direction is in contact with the claw portion, and the other side surface is in contact with a protrusion of the iron core .   The rotor according to claim 1, wherein the iron plate is provided at both end portions of the iron core.   3. The rotor according to claim 1, wherein the iron plate is provided at least two places at regular intervals in the middle of the lamination of the iron cores.   The rotor according to claim 3, wherein the iron plate and the iron core provided at the constant interval are in a position shifted by a certain angle in the circumferential direction. In a rotor having an iron core part formed integrally with a rotating shaft and having protrusions formed at equal intervals in the circumferential direction of the outer peripheral surface, and a permanent magnet fixed between the protrusions of the iron core part,
A nail formed on both ends of the iron core, the shape of the protrusion being substantially the same as the shape of the protrusion of the iron core, and extending in the circumferential direction from the end of the protrusion and bending in the axial direction A rotor comprising: an iron plate provided with a portion , wherein one side surface in the circumferential direction of the permanent magnet is in contact with the claw portion and the other side surface is in contact with a protruding portion of the iron core . In a rotor having a rotating shaft, an iron core provided on the rotating shaft, and a permanent magnet fixed to the outer peripheral surface of the iron core,
The iron core is formed with protrusions at equal intervals in the circumferential direction of the outer peripheral surface, and is separate from the rotating shaft, and the shape of the protrusions at both ends of the iron core is that of the protrusion of the iron core. A steel plate having a shape substantially the same as the shape and extending in the circumferential direction from the end of the projection, bending in the axial direction, and provided with a claw , and one side surface in the circumferential direction of the permanent magnet A rotor, wherein the rotor is in contact with the claw portion and the other side surface is in contact with the protrusion of the iron core .   An electric motor incorporated in a stator using the rotor according to claim 1. An iron core in which protrusions are formed at equal intervals in the circumferential direction of the outer peripheral surface is fixed to a rotating shaft, an iron plate having protrusions and attached to the rotating shaft is formed, and the iron plate is moved to the rotating shaft. In the manufacturing method of the rotor that is attached to and fixed by adhering a permanent magnet between the protrusions of the laminated iron cores,
The protrusion of the iron plate is formed in substantially the same shape as the shape of the iron core plate, is extended in the circumferential direction from the end of the protrusion, is bent in the axial direction, and is provided with a claw portion.
When adhering the permanent magnet, an adhesive is applied to at least one of the surfaces between the protrusions of the iron core or the permanent magnet, and positioning is performed with one side surface of the permanent magnet pressed to the claw portion of the iron plate. A method for manufacturing a rotor, wherein the permanent magnet is mounted while being held so as not to move in the circumferential direction.   The method for manufacturing a rotor according to claim 8, wherein the position where the iron plate is attached to the rotating shaft is at both ends of the iron core.   10. The method of manufacturing a rotor according to claim 8, wherein at least two positions where the iron plate is attached to the rotating shaft are provided at regular intervals in the middle of the iron core.   The method for manufacturing a rotor according to claim 10, wherein the iron plates and the iron cores provided at the constant intervals are shifted to a circumferential angle by a predetermined angle. A rotation in which a rotation shaft and an iron core are integrally formed, protrusions are formed at equal intervals in the circumferential direction of the outer peripheral surface of the iron core, and a permanent magnet is fixed between the protrusions of the iron core and the protrusions. In the manufacturing method of the child, at both ends of the iron core, the shape of the protrusion is substantially the same as the shape of the protrusion of the iron core, and extends in the circumferential direction from the end of the protrusion. An iron plate that is bent in a direction and provided with a claw portion , wherein one side surface of the permanent magnet in the circumferential direction is in contact with the claw portion, and the other side surface is formed in contact with the protrusion of the iron core. A method for manufacturing a rotor. In the method for manufacturing a rotor, in which an iron core is provided on a rotation shaft, and a permanent magnet is fixed to the outer peripheral surface of the iron core,
The iron core is formed with protrusions at equal intervals in the circumferential direction of the outer peripheral surface so as to be separate from the rotating shaft, and the shape of the protrusions at both ends of the iron core is that of the protrusion of the iron core. An iron plate having a shape substantially the same as the shape and extending in the circumferential direction from the end of the projection, and bent in the axial direction to provide a claw portion, and one side surface in the circumferential direction of the permanent magnet is the claw together abuts the parts, the manufacturing method of the rotor, characterized in Rukoto other side is formed in contact with the protrusion of the core. A method for manufacturing an electric motor, wherein the method is incorporated into a stator using the method for manufacturing a rotor according to claim 8.

Images