WO2007010751A1

WO2007010751A1 - Permanent magnet type motor

Info

Publication number: WO2007010751A1
Application number: PCT/JP2006/313465
Authority: WO
Inventors: Katsunori Imaji; Toshio Fujino
Original assignee: Kabushiki Kaisha Yaskawa Denki
Priority date: 2005-07-20
Filing date: 2006-07-06
Publication date: 2007-01-25
Also published as: TW200711260A

Abstract

A permanent magnet type motor enabling a segment type magnets to be accurately and fixedly adhered to the outer peripheral surface of a rotor core. The permanent magnet type motor comprises a permanent magnet type rotor formed by fixedly adhering the plurality of segment type magnets (3a) to (3h), at intervals, onto the outer peripheral surface of the rotor core (2) fixedly fitted to the outer peripheral surface of a rotating shaft. V-shaped or U-shaped projections (4a) to (4h) are disposed on the outer peripheral surface of the rotor core (2) at positions between the segment type magnets (3a) to (3h). One side pieces of the projections (4a) to (4h) are formed as magnet support parts (4aa) to (4ha) in contact with one sides of the magnets without changing their shape, and the other side pieces are formed as magnet pressing parts (4ab) to (4hb) pressing the other sides of the magnets in the circumferential direction by pressurizing.

Description

Specification

Permanent magnet motor

Technical field

[0001] The present invention relates to a permanent magnet motor, and more particularly to a rotor.

Background art

[0002] In a permanent magnet motor, a segment-shaped magnet concentric or eccentric with the outer peripheral surface of the rotor core is bonded to the outer peripheral surface of the rotor core that is fitted and fixed to the outer peripheral surface of the rotating shaft. Many of them employ a structure that is bonded with an agent (for example, see Patent Document 1). As shown in FIG. 3, the permanent magnet rotor 11 of the permanent magnet motor in the prior art has segment magnets 13 on the outer peripheral surface of the rotor core 12 and protrusions 14 arranged at equal intervals in the circumferential direction. Then, the inner peripheral surface of the segment magnet 13 and the outer peripheral surface of the rotor core 12 are bonded and fixed with an adhesive (not shown).

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-236366

Disclosure of the invention

Problems to be solved by the invention

[0003] However, such conventional techniques have the following problems.

(1) When a segment magnet of a permanent magnet motor is attached to the rotor core, an adhesive is applied between the protrusions of the rotor core, and the segment magnet is placed between the protrusions to heat and cure the adhesive. In order to prevent the segmented magnet from moving, it was necessary to fasten and fix the outer periphery of the magnet with a band, and the assembly work was troublesome.

(2) The distance between the projections on both ends of the segment magnet in the circumferential direction should be set slightly wider than the circumferential width of the segment magnet in consideration of manufacturing errors between the rotor core and the segment magnet segment. Yes. Therefore, as shown in Fig. 4, a gap G was created between the segment-type magnet and the projection, and the positioning accuracy of the segment-type magnet became unstable and the positioning accuracy was lowered. This also increased the cogging torque of the permanent magnet motor.

The present invention has been made to solve such problems, and is a segment type magnet. It is an object of the present invention to provide a permanent magnet motor capable of accurately bonding and fixing the rotor to the outer peripheral surface of the rotor core.

Means for solving the problem

In order to solve the above problems, the present invention is configured as follows.

According to the first aspect of the present invention, there is provided a permanent magnet type rotor in which a plurality of segment type magnets are bonded and fixed at intervals to the outer peripheral surface of the rotor core fitted and fixed to the outer peripheral surface of the rotary shaft. In the provided permanent magnet type motor, a V-shaped or U-shaped projection is arranged on a portion of the outer peripheral surface of the rotor core located between the segment-type magnets, and a piece on one side of the projection is arranged. The magnet support portion is in contact with the magnet on one side in the shape as it is, and the magnet pressing portion is configured to press the other side piece in the circumferential direction by pressing the other side piece.

The invention according to claim 2 is characterized in that the protrusion is formed by the rotor core.

The invention according to claim 3 is characterized in that one or a plurality of the protrusions are formed in the axial direction of the rotor core.

The invention's effect

[0005] The present invention has the following effects.

(1) According to the invention of claim 1, since the magnet support portion of the protrusion is not deformed, but only the magnet holding portion is deformed, the origin position for positioning the magnet is determined, and the magnet circle The positioning accuracy in the circumferential direction is improved. Thereby, the cogging torque of the permanent magnet type motor can be reduced. In addition, when the magnet is bonded, the magnet is temporarily fixed by the protruding magnet support portion and the magnet holding portion, so that the band and the work required for fixing and fixing the magnet become unnecessary.

(2) According to the invention described in claim 2, since the protrusions can be formed at the same time when the rotor core is manufactured, the permanent magnet motor can be easily manufactured.

(3) According to the invention described in claim 3, the strength and elasticity of the magnet pressing portion of the protrusion can be freely set by the number of protrusions formed in the axial direction of the rotor core. Therefore, it becomes easy to attach the segment type magnet and damage the magnet. There is no fear. Moreover, the leakage magnetic flux can be suppressed.

Brief Description of Drawings

[0006] FIG. 1 is a view showing a permanent magnet rotor according to a first embodiment of the present invention, in which (a) is a front sectional view and (b) is a side view.

FIG. 2 is a configuration diagram showing a state before and after deformation of a magnet presser that is a piece on the other side of the protrusion in FIG.

FIG. 3 is a front sectional view showing a permanent magnet rotor in the prior art.

Explanation of symbols

[0007] 1 Permanent magnet motor rotor

2 Rotor core

3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h Segment magnet

4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h Projection

4aa, 4ba, 4ca, 4da, 4ea, 4fa, 4ga, 4ha Magnet support rod | 54ab, 4bb, 4cb, 4db

, 4eb, 4fb, 4gb, 4hb Magnet holder

11 Permanent magnet rotor (prior art)

12 Rotor core

13-segment magnet

14 Protrusions

G gap

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

FIG. 1 is a view showing a permanent magnet rotor according to a first embodiment of the present invention, in which (a) is a front sectional view and (b) is a side view.

FIG. 2 is a configuration diagram showing a state before and after deformation of the magnet presser, which is a piece on the other side of the protrusion in FIG.

In FIG. 1, 1 is a rotor of a permanent magnet type motor, so-called permanent magnet type rotor. . 2 is a rotor core fitted and fixed to the outer peripheral surface of a rotating shaft (not shown), 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h (hereinafter referred to as 3a to 3h) are the rotor cores A plurality of segmented magnets (hereinafter simply referred to as magnets), 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h (hereinafter referred to as 4a-4h) V-shaped or U-shaped projections provided on the outer peripheral surface of the rotor core 2 between the magnets 3a to 3h, 4aa, 4ba, 4ca, 4da, 4ea, 4fa, 4ga, 4ha (Hereinafter referred to as 4aa to 4ha) is a piece on one side of the protrusion, and forms a magnet support part that contacts the magnet on the one side (the magnet on the right side in the drawing) as it is. 4ab, 4bb, 4cb, 4db , 4eb, 4fb, 4gb, 4hb (hereinafter referred to as 4ab to 4hb) are pieces on the other side of the projection, and pressurize the other side magnet (the left magnet in the drawing) in the circumferential direction. Constitute a net holding portion. In this case, any force can be used to make the magnet support part 4aa to 4ha the magnet holding part 4ab to 4hb. In all of the projections 4a~4h, the same side is a magnet support part 4aa~4ha or magnet holding section 4 _a b~4hb Kaninatsute! /, Which I'll do it! /,. The magnets 3a to 3h have an outer peripheral surface having an arc shape, and are fixed to the outer peripheral surface of the rotor core 2 by adhesion.

The protrusions 4a to 4h are formed of the rotor core 2, and are integrally formed on the outer peripheral surface of the rotor core 2 when the rotor core 2 is punched out of the strip-shaped steel plate with a press. Further, the protrusions 4a to 4h are formed at one place or a plurality of places in the axial direction of the rotor core 2. Depending on the number of projections to be formed, the strength and elasticity of the magnet pressing portion of the projection can be freely set. In addition, by reducing the number of protrusions, the strength and elasticity of the magnet holder can be increased so that the magnets 3a-3h can be prevented from being damaged when the magnets 3a-3h are mounted. Leakage magnetic flux due to existence can be suppressed. In this embodiment, it is formed at two locations.

The rotating shaft may be fitted and fixed to the rotor core 2 either before or after the magnets 3a to 3h are bonded and fixed to the rotor core 2.

In such a configuration, the two magnets 3a to 3h are fixed to the rotor core as follows.

First, an adhesive is applied between the protrusions 4 a to 4 h on the outer peripheral surface of the rotor core 2. Next, press the magnets 3a to 3h against the sides of the magnet support parts 4aa to 4ha of the protrusions 4a to 4h. Then, the radial force of the rotor core 2 is also inserted between the protrusions 4a to 4h. At this time, since the gap between the protrusions 4a to 4h is set wider than the circumferential width dimension of the magnet 3 by the gap G, the magnet 3 can be easily inserted between the protrusions 4a to 4h. It is out.

For example, the magnet 3h pushed between the protrusion 4g and the protrusion 4h is pressed against the right side of the magnet pressing part 4hb of the protrusion 4h on the right side of the drawing from the top, diagonally upward from the right, or the right lateral force. By pressing the holding part 4hb against the right side surface of the magnet 3h from the circumferential direction, it is positioned and fixed (temporarily fixed) so as not to move in the circumferential direction. All the magnets 3a to 3h are positioned and fixed on the outer peripheral surface of the rotor core 2 in this way, and in this state, are fixedly bonded to the rotor core 2.

In this case, when the magnets 3a to 3h are bonded and fixed to the rotor core 2, the protruding magnet support portion is not deformed, but only the magnet pressing portion is deformed! The position of the origin is fixed, and the positioning accuracy of the magnet in the circumferential direction is greatly improved.

In FIG. 2, the protrusions 4a and 4g show a state before pressure is applied to the magnet pressing portions 4ab and 4gb.

With the above configuration, in the permanent magnet type motor of the present invention, the positioning accuracy in the circumferential direction of the magnet is improved, so that the cogging torque of the permanent magnet type motor can be reduced. In addition, the band and the work required to fix and fix the magnet are no longer necessary.

Further, since the protrusions 4a to 4h can be formed at the same time when the rotor core 2 is manufactured, it is possible to easily manufacture a permanent magnet motor.

In the present invention, it is needless to say that the protrusions 4a to 4h are not formed by the rotor core 2, and separate members may be used. In this case, the protrusions 4a to 4h are not limited to metal, and may be made of grease or the like.

Industrial applicability

The present invention is applied to a permanent magnet type motor, and in particular to the rotor thereof, the permanent magnet type capable of accurately bonding and fixing the segment type magnet to the outer peripheral surface of the rotor core. It can be used in the field of providing motors.

Claims

The scope of the claims

[1] Permanent magnet motor having a permanent magnet rotor in which a plurality of segmented magnets are bonded and fixed to the outer peripheral surface of the rotor core that is fitted and fixed to the outer peripheral surface of the rotating shaft. In

V-shaped or U-shaped protrusions are disposed on the outer peripheral surface of the rotor core between the segment-shaped magnets, and one piece of the protrusion is left as it is with the one-side magnet. A permanent magnet type motor characterized in that it is a magnet support part that comes into contact, and a magnet pressing part that presses the other side piece and presses the other side magnet in the circumferential direction.

2. The permanent magnet motor according to claim 1, wherein the protrusion is formed by the rotor core.

[3] The permanent magnet motor according to [1] or [2], wherein the protrusion is formed at one place or a plurality of places in the axial direction of the rotor core.