JPH04165933A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To enable a permanent magnet to be fixed positively in an extremely simple method by providing a protrusion part which presses the permanent magnet to a edge plate or an elastic member which presses the permanent magnet between the edge plate and the permanent magnet. CONSTITUTION:A plurality of permanent magnets 2 are placed on a cylindrical outer-periphery surface, a can body 3 is coated on an outer-periphery surface of this permanent magnet for covering, a flexed elastic member is placed between the edge plate and the permanent magnet, an edge plate 4 is placed at both edge parts in axial direction of the rotor core 1, a rivet 5 is inserted into the edge plate 4 and the rotor core 1 by matching the edge plate 4 on both edge surfaces of the rotor core 1, the permanent magnet 2, and the can body 3, and they are caulked and fixed. At this time, an elastic force is applied to the elastic member 9 between the permanent magnet 2 and the edge plate 4, thus enabling the permanent magnet 2 to be fixed and regulated.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides a permanent magnet type motor with an improved fixing structure for components such as a rotor core and permanent magnets of a rotor having permanent magnets. Regarding the rotor.

(Prior art) Generally, in a rotor having permanent magnets, a plurality of permanent magnets are arranged on the outer circumferential surface of a cylindrical rotor core, and a can body is placed over the outer circumferential surface of the permanent magnets to cover the rotor core. End plates are arranged at both ends in the axial direction, but the 9 permanent magnet cans have large dimensional tolerances, and the outer circumferential surface of the rotor core and the inner circumferential surface of the permanent magnets, as well as the outer circumferential surface of the permanent magnets and the can body. It has been difficult to reduce the gap on the inner circumferential surface of the

For this reason, if the precision of each member is poor and the gap is large, the permanent magnet will move between the rotor core and the can body, causing the permanent magnet to crack or cause noise and vibration when the rotor rotates. There was a problem.

Therefore, Japanese Patent Laid-Open No. 59-201663 is known as a method for preventing such problems.

As shown in FIG. 4, this rotor structure has a plurality of permanent magnets 2 arranged on the outer circumferential surface of a cylindrical rotor core 1, and a can body 3 is placed on the outer circumferential surface of the permanent magnets 2 to cover them. At the same time, end plates 4 are placed on both end faces of the rotor core 1 in the axial direction, and rivets 5 are inserted into the through holes provided in the axial direction of the rotor core 1. After assembly by caulking, the permanent magnets are assembled. The permanent magnet 2 is fixed by injecting resin into the gap formed at both ends of the permanent magnet 2 to fill the gap.

(Problems to be Solved by the Invention) However, in the case of such a rotor structure, the resin is injected after the rotor is assembled, which increases the number of man-hours and increases the manufacturing cost. In addition, the resin could not be injected to the middle part of the permanent magnet, and it took a long time to inject the resin.

On the other hand, it is possible to reduce the dimensional tolerance of the permanent magnet 9 can bodies, but this would not only require more manufacturing steps and be expensive, but also because the can bodies would be inserted by press-fitting or shrink-fitting during assembly.
There was a problem that force was applied to the permanent magnet, causing damage or bending the can body.

Therefore, the present invention provides a permanent magnet rotor that can securely fix the permanent magnets in an extremely simple manner even when the dimensional accuracy of the can body and the permanent magnets is poor and there is a large gap, and there is less damage, noise, and vibration caused by rotation. The purpose is to (Means for Solving the Problems) In order to solve the above object, in the present invention, a plurality of permanent magnets are arranged on the outer circumferential surface of a cylindrical rotor core, and a can body is placed on the outer circumferential surface of the permanent magnets. In a permanent magnet rotor in which end plates are placed at both ends of the rotor core in the axial direction, protrusions that press the permanent magnets are provided on the end plates, or between the end plates and the permanent magnets. It is constructed by providing an elastic member that presses the permanent magnet.

(Function) According to such a configuration, when providing a protrusion that presses a permanent magnet on the end plate, a plurality of permanent magnets are arranged around the outer periphery of the rotor core, and a can is placed on the outer periphery of the permanent magnet. The rotor can be easily completed by simply placing the body over the body, aligning the end plates with both ends of the rotor core, inserting rivets, and caulking to apply force to fix and regulate the permanent magnets.

In addition, when providing an elastic member that presses the permanent magnet between the end plate and the permanent magnet, a plurality of permanent magnets are arranged around the outer periphery of the rotor core, and a can body is placed over the outer periphery of the permanent magnet. Simply place an elastic member between the end plate and the permanent magnet, align the end plate with both ends of the rotor core, insert a rivet, and swage it to apply a force to fix and restrict the permanent magnet. You can easily complete the child.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a permanent magnet rotor according to a first embodiment of the present invention, in which a plurality of permanent magnets 2 are arranged on the outer peripheral surface of a cylindrical rotor core 1, and the permanent magnets The outer peripheral surface of the rotor core 1 is covered with a can body 3, a bent elastic member is arranged between the end plate and the permanent magnet, and the end plate 4 is arranged at both ends of the rotor core 1 in the axial direction. 1. The end plates 4 are aligned with both end surfaces of the permanent magnet 22 and the can body 3, and the rivets 5 are inserted into the end plates 49 and the rotor core 1, and this is fixed by caulking. At this time, an elastic force acts on the elastic member 9 between the permanent magnet 2 and the end plate 4, and the permanent magnet 2 can be fixed and regulated.

Note that although a bent elastic member is used in the first embodiment, it may be made of any material that is elastic and has good heat resistance regardless of its shape, and may be made of metal or non-metal.

In this way, in the first embodiment, it is only necessary to assemble the elastic member at the same time as the rotor core and the nine permanent magnet cans, and the permanent magnets can be fixed in an extremely simple manner. Since there is no need for post-processing such as resin injection, the number of man-hours is small and the processability is excellent.

3(a) and 3(b) are a plan view and a side view of an end plate of a permanent magnet rotor according to a second embodiment of the present invention, and a rivet 5 is attached to a disc-shaped end plate 4a. An insertion hole 8 for insertion and a bent protrusion 7 for fixing and regulating the permanent magnet are provided. This protrusion 7 is provided by cutting and raising it from the end plate 4a, or by welding another elastic member to the protrusion 7.

A vertical cross-sectional view of a rotor assembled using such an end plate 4a is shown in FIG. The outer peripheral surface of the magnet is covered with a can body 3, end plates 4a and 4b are arranged at both ends of the rotor core 1 in the axial direction, and the rotor core 1. Permanent magnet 2゜ End plate 4 on both end faces of can body 3
Align the rivets 5 to the end plate 4a and the rotor core 1. It is inserted into the end plate 4b and fixed by caulking. At this time, the protrusion 7 of the end plate 4a hits the permanent magnet 2, and an elastic force acts on the protrusion 7 to fix and restrict the permanent magnet 2.

In the second embodiment, the protrusion is provided only on one end plate 4a, but it may also be provided on the other end plate 4b and fixed from both sides.

In this way, in the second embodiment, since the end plate is provided with a protrusion for fixing the permanent magnet, there is no need for post-processing such as injection of resin after assembly as in the past, and the assembly before injection of resin can be done as required. Permanent magnets can be fixed in place using the same assembly process as above, requiring less man-hours and offering excellent workability.

[Effects of the Invention] In the present invention, since the end plate is provided with a protrusion that presses the permanent magnet, and the elastic member that presses the permanent magnet is provided between the end plate and the permanent magnet, the number of processing steps is extremely small. Permanent magnets can be fixed and regulated using a simple method.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a rotor according to a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a rotor according to a second embodiment of the present invention, and FIG. FIG. 3(b) is a plan view of the end plate of the rotor according to the first embodiment of the invention; FIG. 3(b) is a side view of the same end plate;
The figure is a longitudinal sectional view of a conventional rotor. 1... Rotor core 2... Permanent magnet 3... Can body 4... End plate

Claims (1)

[Claims] 1. A plurality of permanent magnets are arranged on the outer peripheral surface of the cylindrical rotor core, and a can body is placed over the outer peripheral surface of the permanent magnets, and the axial direction of the rotor core is What is claimed is: 1. A permanent magnet rotor having end plates disposed at both ends, characterized in that at least one of the end plates is provided with a protrusion that presses the permanent magnet. 2. Arranging a plurality of permanent magnets on the outer peripheral surface of the cylindrical rotor core, covering the outer peripheral surface of the permanent magnets with a can body, and providing end plates at both ends of the rotor core in the axial direction. 1. A permanent magnet rotor, characterized in that an elastic member for pressing the permanent magnet is provided on at least one of the end plate and the permanent magnet.