JPH0134533Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a magnetic pole fixing device for a rotating electrical machine, particularly in a positioning device for a magnet attached to a stator of a magnet motor.

As a conventional magnetic pole fixing device for this type of rotating electric machine, there is one shown in Japanese Utility Model Publication No. 49-44406,
It was constructed as shown in FIGS. 1 and 2.

That is, in FIGS. 1 and 2, 1 is a yoke formed into a cylindrical shape by pressing a mild steel plate member, 2 is an arc-shaped magnet serving as a field pole, and 3 is a yoke formed by bending a spring steel plate. This is a magnet fixing member having a protrusion 31 formed by the above-mentioned method and a protrusion 32 that positions and engages the axial end surface 21 of the arc-shaped magnet 2.

In this conventional device, an arcuate magnet 2 is positioned and fixed on the inner circumferential surface of a yoke 1 by a magnet fixing member 3. However, there were drawbacks such as difficulty in mounting the magnet fixing member 3, particularly in the axial direction, that is, in the direction of arrow A.

This invention was made to eliminate the drawbacks of the conventional ones, and by making the axial end of the magnet fixing member into an inwardly tapered shape, it is possible to fix the magnetic pole of a rotating electric machine easily. The aim is to provide equipment.

An embodiment of this invention will be described below with reference to FIG. That is, in FIG. 3, reference numeral 4 indicates a magnet pressing part 41 having an inwardly tapered end 42 formed by bending a spring steel plate member, and a magnet pressing part 41 having an inwardly tapered end 42 formed by bending a spring steel plate member. The magnet fixing member includes a protrusion 43 that positions and locks the axial end face 21 of the arcuate magnet having an end portion 44, and the magnet pressing portion 41 and the protrusion 43 are in the position shown by the dashed line in FIG. 4 under normal conditions. It is formed in an expanded state. Reference numeral 5 denotes a composite field magnetic pole serving as a stator, which is composed of an auxiliary pole 51 made of a mild steel member and a main magnetic pole 52 made of a ferrite permanent magnet material. Here, the auxiliary pole 51 is fixed in advance to the inner circumferential surface of the yoke 1 by electric resistance welding or a fixing device such as a rivet, and the main magnetic pole 52 is arranged and fixed so as to be in contact with the auxiliary pole 51, and the magnet fixing member 4 is fixed. It is inserted and mounted in the axial direction, and each component is locked as shown.

In this way, the main magnetic pole 52 is fixed by the magnet fixing member 4 that is locked to the auxiliary pole 51 that is fixed in advance. The main magnetic pole 52 is pressed and fixed to the auxiliary pole 51 by the elastic force of the magnet pressing portion 41 .

Note that the main magnetic pole 52 may be adhered and fixed within the inner circumference of the yoke 1 with an adhesive, and in this case, the fixing strength of the main magnetic pole 52 is further increased.

As described above, the magnetic pole fixing device for a rotating electrical machine according to this invention has a pressing part that is inserted between the field poles and presses and locks the magnetic pole in the radial direction, and a protrusion that locks the magnetic pole from both sides in the axial direction. The axial ends of the pressing part and the protruding part of the magnetic pole fixing device are bent inward, making it simple and inexpensive to construct and easy to assemble.

[Brief explanation of the drawing]

Figures 1 and 2 both show a conventional magnetic pole fixing device for this type of rotating electric machine. Figure 1 is a front view, Figure 2 is a perspective view of the main parts, and Figures 3 to 6 are 3 is a perspective view of the main part, FIG. 4 is a front view of the main part, FIG. 5 is a front view, and FIG. 6 is a developed view of the inner peripheral surface of the main part. In the figure, 1 is a yoke, 2 and 5 are field poles, 51 is an auxiliary magnetic pole, 52 is a main magnetic pole, 3 and 4 are magnet fixing members,
41 is a magnet pressing portion, and 43 is a protrusion. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) The same number of field poles are inserted between the field poles of the stator, pressing the radial sides of the poles and bending both axial ends inward. A magnetic pole fixing member having a projection part that engages with a pressing part and both axial ends of the magnetic pole and has an axial end bent inward; the pressing part of the magnetic pole fixing member causes the magnetic pole to be radially Further, a magnetic pole fixing device for a rotating electrical machine is configured to lock a magnetic pole in both axial directions using a protrusion. (2) The magnetic pole fixing device for a rotating electric machine according to claim 1, wherein the magnetic pole fixing member is integrally formed from a spring steel plate member by bending.