JPH065351U - Permanent magnet rotor - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to improve motor performance at low cost in a permanent magnet rotor. [Structure] A plurality of arcuate magnets 2 are provided on the outer circumference of a rotor core 1, and projections 3a provided on a flat non-magnetic metal end plate 3 are provided in non-through holes 1a provided at both ends of the rotor core 1. Since the non-magnetic metal pipe 3 is press-fitted and the non-magnetic metal pipe 3 is shrink-fitted or press-fitted on the outer side of the arcuate magnet 2 and both ends of the pipe 3 are bent to the inner diameter side, the clamp pin becomes unnecessary and the cost is reduced. Further, since there is no through hole in the rotor core 1, the magnetic path permeability is improved and the motor performance is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a permanent magnet rotor having an iron core for forming a magnetic path in a portion close to the inner diameter and a permanent magnet on the outer circumference thereof.

[0002]

[Prior art]

 A permanent magnet rotor that does not have a starting winding generally has a structure in which the iron core is placed inside and the permanent magnet is placed outside to increase the magnet area. Japanese Patent Application Laid-Open No. 2-246748 discloses a configuration which has been adopted in recent years to efficiently produce a rotor having this structure.

The configuration will be described below with reference to FIGS. 3 and 4. As shown in the figure, the through hole 7 is provided in the rotor core 6, and the flat non-magnetic metal end plates 8 are arranged at both ends of the rotor core 6, and the rotor core 6 and the flat non-magnetic metal end plates 8 are Are clamped together by clamp pin 9. After that, a plurality of arcuate magnets 10 are arranged on the outer circumference of the rotor core 6, the nonmagnetic metal pipe 11 is fitted on the outer circumference of the arcuate magnet 10 by shrinking or press fitting, and then the nonmagnetic metal pipe 11 is inserted. Both ends or one of them is bent in the inner diameter direction.

[0004]

[Problems to be solved by the device]

 However, the conventional example has the following problems.

(1) Problems in Motor Performance Since the rotor core 6 is provided with the through holes 7, it is necessary to block the flow of magnetic flux in the rotor core 6 near the center of the magnetic poles as shown in FIG. Therefore, the magnetic path permeability is deteriorated and the motor efficiency is deteriorated. Particularly in recent years, materials having a high residual magnetic flux density such as rare earth magnets have been used for higher efficiency, and the effect of the through holes 7 is further increased.

(2) Problems in Cost In order to efficiently assemble the rotor having the structure shown in FIG. 3, the flat nonmagnetic metal end plate 8 is integrally clamped to the rotor core 6 by the clamp pin 9, After that, a plurality of arcuate magnets 10 are arranged on the outer circumference of the rotor core 6, the nonmagnetic metal pipes 11 are fitted, and then both ends or one of the nonmagnetic metal pipes 11 is bent in the inner diameter direction. Done in. When the plate-like non-magnetic metal end plate 8 is fixed to the rotor core 6 after the non-magnetic metal pipe 11 is fitted, and when the arcuate magnet 10 longer than the laminated thickness of the rotor core 6 is mounted. In addition, there is a problem that the flat non-magnetic metal end plate 8 cannot be completely attached to the rotor core 6. In order to solve the problem, the accuracy of the laminated thickness of the rotor core 6 and the axial length of the arcuate magnet 10 may be increased, but this leads to an increase in cost. Therefore, as described above, fixing the plate-shaped non-magnetic metal end plate 8 to the rotor core 6 first can reduce the problems in the subsequent assembling process. However, in the conventional example, the rotor core 6 and the plate-shaped non-magnetic metal end plate 8 are fixed by the clamp pin 9, so that the material cost of the clamp pin 9 is high. In addition, equipment costs will be high in order to promote automation.

The present invention solves the above-mentioned problems, and aims at improving the motor performance at low cost.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a plurality of arcuate magnets on the outer circumference of a rotor core that is obtained by caulking iron plates and is laminated in a cylindrical shape. A magnetic metal end plate is provided, a non-magnetic metal pipe is shrink-fitted or press-fitted on the outside of the arcuate magnet, and both ends of the non-magnetic metal pipe are bent inward. The non-through holes are provided in the plate-shaped non-magnetic metal end plate, and the same number of protrusions are provided at the positions corresponding to the non-through holes provided in the rotor core. It was pressed in.

[0009]

[Action]

 According to the present invention, in the structure described above, the rotor core and the plate-shaped nonmagnetic metal end plates are fixed by pressing the projections provided on the plate-shaped nonmagnetic metal end plates into the non-through holes provided at both ends of the rotor core. Therefore, the clamp pin becomes unnecessary. Further, since the depth of the non-through holes of the rotor core is usually only 2 to 3 mm, good magnetic performance can be maintained without deteriorating the magnetic path permeability in the rotor core.

[0010]

【Example】

 (Embodiment 1) Hereinafter, a permanent magnet rotor according to a first embodiment of the present invention will be described with reference to FIG.

As shown in the figure, a plurality of arcuate magnets 2 are provided on the outer circumference of a cylindrical rotor core 1 obtained by caulking iron plates, and a flat plate shape is formed on both end faces of the rotor core 1 in the stacking thickness direction. A non-magnetic metal end plate 3 is provided. A plurality of non-penetrating holes 1a (usually a depth of 2 to 3 mm) are provided on both end faces of the rotor core 1, and the flat non-magnetic metal end plate 3 is a non-penetrating hole provided on the rotor core 1. The same number of protrusions 3a are provided by burring at positions corresponding to 1a. Then, the projections 3a of the flat non-magnetic metal end plate 3 are press-fitted into the non-through holes 1a at both ends of the rotor core 1 to fix the rotor core 1 and the flat non-magnetic metal end plate 3 to each other. After that, the non-magnetic metal pipe 4 is shrink-fitted or press-fitted to the outside of the arcuate magnet 2, and both ends of the non-magnetic metal pipe 4 are bent in the inner diameter direction.

In the above structure, the rotor core 1 and the flat plate-shaped nonmagnetic metal end plate 3 are fixed to the flat plate-shaped nonmagnetic metal end plate 3 in the non-through holes 1 a provided at both ends of the rotor core 1. Since the protrusion 3a is press-fitted, the clamp pin becomes unnecessary. Further, both ends of the non-magnetic metal pipe 4 are bent to the inner diameter side in order to supplement the clamping force between the rotor core 1 and the flat non-magnetic metal end plate 3, and the reliability is not different from the conventional example. Absent. Since the depth of the non-through hole 1a of the rotor core 1 is usually only 2 to 3 mm, the magnetic path permeability in the rotor core 1 is not deteriorated unlike the conventional example.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. As shown in the figure, the protrusion 5a of the flat non-magnetic metal end plate 5 is provided by half blanking, and the effect is of course the same as that of the first embodiment. .

[0014]

[Effect of device]

 As is apparent from the above description of the embodiment, the present invention has the following effects as compared with the conventional example.

(1) Since the rotor core and the flat plate-shaped nonmagnetic metal end plate are fixed, the protrusions provided on the flat plate-shaped nonmagnetic metal end plate are press-fitted into the non-through holes provided in the rotor core. Material cost can be reduced because clamp pins are not required. Also, since there are no clamp pins, assembly can be automated easily, and equipment costs are low.

(2) Since both ends of the non-magnetic metal pipe are bent to the inner diameter side in order to supplement the clamping force between the rotor core and the flat non-magnetic metal end plate, the reliability is higher than that of the conventional example. It doesn't change.

(3) Since the depth of the non-through hole of the rotor core is usually only 2 to 3 mm, the magnetic path permeability in the rotor core is not deteriorated and the motor efficiency is improved. Especially, when a material having a high residual magnetic flux density such as rare earth is used, the effect becomes great.

As described above, the permanent magnet rotor according to the present invention can provide a high-performance motor at a low cost, and a great effect can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a permanent magnet rotor according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a permanent magnet rotor according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a conventional permanent magnet rotor.

FIG. 4 is a plan view of a permanent magnet rotor of the same.

[Explanation of symbols]

 1 rotor core 1a non-through hole 2 arcuate magnet 3 flat plate non-magnetic metal end plate 3a protrusion 4 non-magnetic metal pipe

Claims (1)

[Scope of utility model registration request] 1. A cylindrical non-magnetic metal end plate having a plurality of arcuate magnets on the outer periphery of a cylindrical rotor core obtained by caulking iron plates, and having both end faces in the stacking thickness direction of the rotor core. A non-magnetic metal pipe is shrink-fitted or press-fitted on the outside of the arcuate magnet, both ends of the non-magnetic metal pipe are bent in the inner diameter direction, and a plurality of end faces of the rotor core are provided. Providing the same number of projections at positions corresponding to the non-through holes provided in the rotor iron core on the flat plate-shaped non-magnetic metal end plate, the plurality of non-through holes of the rotor iron core are provided. A permanent magnet rotor having the protrusions press-fitted therein.