JPH11289699A - Rotor of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive rotor with extremely simple structure, by utilizing a step part being composed on both end faces in the axial direction of a permanent magnet and a lamination core part for sealing balance putty. SOLUTION: Balance putty 12 is sealed to a step part being composed at a lamination core part 16 of both ends in the axial direction of a plurality of permanent magnets 11 being inserted into a specific position of the lamination core part 16. The balance putty 12 is sealed to the step part of at least one end of both ends in the axial direction of the permanent magnet 11 for composing a rotor 10. In this manner, the unbalance of the rotor 10 can be corrected by an extremely simple configuration, and the fixing of the locking piece of a plurality of permanent magnets 11 can be made by sealing the balance putty 12, thus obtaining an easy and inexpensive rotor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of an electric motor used as a drive source for a machine tool or an electric vehicle as industrial equipment and an air conditioner compressor as home appliance.

[0002]

2. Description of the Related Art The structure of a conventional motor rotor will be described with reference to the drawings.

[0003] As shown in FIG. 3, a plurality of permanent magnets 31 inserted at predetermined positions of a laminated core portion 36 are sandwiched between end plates 37 disposed on both end surfaces of the laminated core portion 36. Thus, the rotor 30 is obtained. The end plate 37 is provided with a correction hole 32 corresponding to an unbalance amount on an outer peripheral portion of the end plate 37 for correcting the balance of the rotor 30.
The permanent magnet 31 is fixedly secured.

[0004]

However, in the above configuration, in order to balance the rotor, end plates are provided on both end surfaces of the laminated core portion, and a considerable amount of correction holes are formed in the outer peripheral portion of the end plate. For example, the end plate is made of a non-magnetic material, and the material cost is high.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a rotor capable of correcting a balance and fixing a permanent magnet with a simple structure.

[0006]

A rotor of an electric motor according to the present invention is an embedded magnet type rotor in which a plurality of permanent magnets are inserted at predetermined positions of a laminated core. Since the balance putty is fixed by utilizing the steps formed on both end surfaces, the balance is corrected and the permanent magnet is prevented from coming off with an extremely simple structure.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a balance putty is fixed to a plurality of permanent magnets and step portions formed at both ends in the axial direction of a laminated iron core portion to correct the balance.

According to the above configuration, the balance putty corresponding to the unbalance amount is fixed to the step portion at the corresponding position of the inserted permanent magnet formed on both end surfaces of the laminated iron core.
The balance of the rotor can be corrected with a simple configuration, and the permanent magnet can be fixed and secured.

Further, a balance putty may be fixed to at least one end face in the axial direction of the stepped portion of the same permanent magnet to fix the permanent magnet.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, a balance putty 12 is fixed to steps formed in the laminated core 16 at both ends in the axial direction of a plurality of permanent magnets 11 inserted at predetermined positions of the laminated core 16.

The balance putty 12 is fixed to at least one of the two axial ends of the permanent magnet 11 to constitute the rotor 10.

As described above, according to the rotor of the embodiment of the present invention, the imbalance of the rotor 10 can be corrected with an extremely simple configuration, and the plurality of permanent magnets 11 are prevented from coming off by fixing the balance putty 12. Thus, an easy and inexpensive rotor 10 is obtained.

[0014]

As is apparent from the above embodiment, the step of fixing the balance putty and the step of fixing the permanent magnet by utilizing the step portions at both ends in the axial direction formed by the laminated core portion and the inserted permanent magnet are used. , The special balance correcting component and the retaining component are not required, and an extremely simple and inexpensive rotor can be provided. Also, by attaching a balance putty to the step,
A highly reliable rotor with no balance putty scattering at high speed rotation.

[Brief description of the drawings]

FIG. 1 is a side half sectional view showing a configuration of a rotor according to an embodiment of the present invention.

FIG. 2 is an AA arrow view showing a configuration of a rotor in one embodiment of the present invention.

FIG. 3 is a half sectional side view showing a conventional rotor.

[Explanation of symbols]

 Reference Signs List 10 Rotor 11 Permanent magnet 12 Balance putty 15 Shaft 16 Laminated core

Claims (2)

[Claims] 1. An embedded magnet type rotor in which a plurality of permanent magnets are inserted at predetermined positions of a laminated core portion, wherein a balance putty is formed by using step portions formed at both axial ends of the permanent magnet and the laminated core portion. A rotor for an electric motor, wherein the rotor is fixed. 2. A rotor for an electric motor according to claim 1, wherein a balance putty is fixed to at least one end of a step formed at both ends in the axial direction of the same permanent magnet.