JPH0469028A - Electric motor - Google Patents

Abstract

PURPOSE:To obtain a motor which can be assembled easily by fitting a protrusion on the inner diameter side of a plastic magnet to a recess of a laminate yoke and then thermally deforming the axial end of the plastic magnet thereby forming a fixed part. CONSTITUTION:Protrusion 2 of a plastic magnet 1 is fitted to a recess 3 made on the outer circumferential side of a laminate yoke 4 and then a shaft 5 is inserted. Axial end of the plastic magnet 1 is then thermally deformed thus forming a fixed part 6. The fixed part 6 extends to the end face of the laminate 4 and secures the assembly in the axial direction. Consequently, the plastic magnet 1 pushes the opposite end face and supports the laminate 4 in the axial direction. The thermally softened plastic magnet 1 not only retain the end face of the laminate 4 but has influence on the inside of the recess 3 thus realizing rigid securing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric motor whose rotor is formed using a terrastic magnet.

[Prior art] An electric motor constructed using plastic magnets is
Press-fitting or adhesive methods have been used to join the plastic magnet and the laminate yoke.

[Problem 7 to be Solved by the Invention This method has the problem that it takes time to connect and assembly is not easy.

The present invention was made in view of these circumstances, and
The purpose is to provide an electric motor that can be easily assembled.

[Means for Solving the Problems] The present invention provides a laminate yoke in which a convex portion extending in the axial direction is formed on the inner diameter side of a cylindrical plastic magnet, and a concave portion into which the convex portion is fitted is provided. The problem is solved by forming a fixing part by fitting the convex part and the concave part to join the plastic magnet and the laminate yoke, and thermally deforming the axial end part of the plastic magnet. There is.

[Function] When the end of the plastic magnet is thermally deformed, it extends to the end face of the laminate yoke and can be fixed in the axial direction, preventing it from coming off in the axial direction.

In the circumferential direction, the convex portion and the concave portion fit together to ensure a secure connection, which not only facilitates assembly but also provides a strong connection.

[Embodiment] The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a perspective view of a main part showing the structure of a rotor portion of an electric motor according to an embodiment of the present invention. , FIG. 2 is a longitudinal sectional view thereof.

In FIG. 1, the rotor portion of the electric motor is shown in an unfinished state, and a plastic magnet 1 is formed into a cylindrical shape, and a plurality of convex portions 2 are formed on the inner diameter side thereof.

A laminate yoke 4 having a recess 3 on the outer circumferential side is formed so as to fit into the projection 2, and a shaft 5 passes through the laminate yoke 4.

Further, the plastic magnet 1 is a plastic magnet, and the laminate yoke 4 is a yoke made of laminated steel plates.

In Figure 2, the electric motor is connected to a plastic magnet 1.
The convex portion 2 of the laminate yoke 4 is fitted into the concave portion 3 of the laminate yoke 4 to be assembled.

The axial end of the plastic magnet 1 is thermally deformed to form a fixed part 6, and this fixed part 6 is
It extends to the end face of the laminate yoke 4 and is fixed in the axial direction.

In such a configuration, the electric motor includes a plastic magnet 1 and a laminate yoke 4, as shown in FIG.
The convex portion 2 and the concave portion 3, which are respectively formed in the above, are fitted and combined.

When the plastic magnet 1 is at an appropriate position in the axial direction, the end portion of the plastic magnet 1 is heated and deformed using a heating device such as a soldering iron.

By performing such deformation, the plastic magnet 1 is plastically deformed and extended from both end faces of the laminate yoke 4, thereby forming the fixing portion 6.

The plastic magnet 1 extending to the end surface of the laminate yoke 4 can support the laminate yoke 4 in the axial direction by pressing against the opposite end surface.

In addition, plastic magnet 1 softened by heating
does not press and support only the end face of the laminate yoke 4, but also influences the inside of the recess 3 of the laminate yoke 4, thereby making the fixation strong.

Such deformation of the plastic magnet 1 is not limited to only the end of the convex portion 2, but the same effect can be obtained in any part that affects the end face of the laminate yoke 4. .

Further, the shape of the convex portion 2 and the concave portion 3 is not limited as long as they can be fitted into each other, and any shape may be used as long as they can be fitted in the axial direction and restrained in the circumferential direction.

[Effects of the Invention] According to the present invention, the plastic magnet and the laminate yoke can be fixed after assembly by fitting and deforming by heating without using adhesives or press-fitting, so it is possible to easily complete the electric motor. can.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part showing the structure of a rotor portion of an electric motor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view thereof. 1...Plastic magnet, 2...Protrusion, 3
... recess, 4... laminate yoke, 5...
Axis, 6...Fixed part.

Claims (1)

[Claims] A convex portion extending in the axial direction is formed on the inner diameter side of a cylindrical plastic magnet, a laminate yoke including a concave portion into which the convex portion is fitted is formed, and the convex portion and the concave portion are fitted. An electric motor characterized in that a plastic magnet and a laminate yoke are combined, and a fixing portion is formed by thermally deforming an axial end portion of the plastic magnet.