JPS639246Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a multipolar stator for a rotating electric machine (for example, a starting motor), and more particularly, to an improvement in the yoke joint structure thereof.

(Prior Art) This type of stator generally uses a yoke formed from a plate material shaped into a cylindrical shape. Conventionally,
The end surfaces of the yoke thus formed into a cylindrical shape were joined together by welding. (For example, Jitsukaiaki
54-57311).

(Problem that the invention aims to solve) However, in such a welded yoke, build-up or denting occurs in the welded joint, which not only impairs the appearance, but also causes problems in the transfer coating performed by rolling the yoke in the subsequent process. was occurring. In addition, in order to take these measures and save labor in the process,
In recent years, non-welded yokes have been developed that are simply rolled plate materials, but with this type, excessive vibration can cause the yoke end faces to open, resulting in poor vibration resistance and waterproofing properties, as well as an increase in the gap. As a result, there was a problem in that the output of the rotating electrical machine decreased.

Therefore, the object of the present invention is to provide a yoke coupling structure that has the same strength as a general welded yoke in terms of vibration resistance and can save labor in the process.

(Means for solving the problem) Therefore, the present invention includes a yoke formed by forming plate materials into a cylindrical shape by bringing their end faces into contact with each other without welding, and a yoke fixed to the inner circumference of this yoke. In a stator of a rotating electrical machine having a plurality of pole cores, at least one pole core is disposed at a portion including and straddling the abutting portion of the yoke, and the pole core is fixed to both sides of the yoke abutting portion. The present invention also provides a stator for a rotating electrical machine in which the abutting portion of the yoke is coupled to the pole core via the pole core.

(Function) As a result, the contact portions of the yokes are simultaneously connected by fixing the pole core to the yoke without directly welding the end surfaces of the yoke joint portions.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described. In FIG. 1, a yoke 1 is formed by molding a plate material into a cylindrical shape and bringing the end surfaces into contact with each other at an abutment portion 1a. There are four pole cores 2 on the inner circumference of this yoke 1 (only two are shown in the figure).
is fixed. Each pole core 2 has an iron core 2a
It has a tip portion 2b that is integrally formed on one end of the inner circumference and extends to both sides in the circumferential direction. A field coil 3 is wound around the iron core 2a of each pole core 2 via an insulating coating 3a, and is held between the pole core chip 2b and the inner periphery of the yoke 1.
In this way, a four-pole stator is constructed.

When fixing each of the pole cores to the inner peripheral surface of the yoke 1, for example, two protrusions 2c and 2d are provided on the outer peripheral surface of each pole core core part 2a as shown in FIGS. 2 and 3. It is fixed to the inner circumferential surface of the yoke 1 by, for example, brodie extension welding. In this case, the fixed portion of one pole core 2 is selected to be a portion that includes the abutting portion 1a of the yoke 1, and the two protrusions 2c and 2d are selected to straddle the abutting portion. By fixing the pole core 2, the contact portion 1a of the yoke 1 is also firmly bridged. Therefore, the contact portion 1a of the yoke 1
does not require direct welding.

In addition, in the present invention, instead of providing two protrusion welding protrusions on the pole core as described above, other shapes such as ring-shaped or planar protrusions that can straddle the yoke contact part are provided. Even if provided, the yoke contact portion can be firmly bridged by fixing the pole core as in the above case. Also,
Even when a tubular material with slits is used as the yoke, the bridging structure using the pole core according to the present invention is applicable. Of course, if the pole core straddles the abutting portion of the yoke, the pole core is not limited to welding, but may be secured by screws or the like.

(Effects of the invention) As explained above, the present invention simultaneously joins the yokes by fixing the pole core to the yoke without directly welding the end faces of the yoke joints. In addition to greatly reducing man-hours and costs, it is possible to improve the appearance of the yoke and facilitate painting such as transfer. In addition, compared to a non-painted yoke, there is no gap between the end faces of the yoke, and vibration resistance and output performance can be improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of the main parts showing one embodiment of the stator according to the present invention, Fig. 2 is a plan view of the pole core shown in Fig. 1, and Fig. 3 is a cross-sectional view of the pole core shown in Fig. 2. . 1... Yoke, 1a... Yoke contact portion, 2... Polcor.

Claims (1)

[Scope of utility model registration request] A stator for a rotating electrical machine having a yoke formed by forming plate materials into a cylindrical shape by bringing their end faces into contact with each other in a non-welded state, and a plurality of pole cores fixed to the inner periphery of the yoke, at least one A pole core is disposed at a location that includes and straddles the abutting portion of the yoke, and the pole core is fixed to both sides of the yoke abutting portion, and the abutting portion of the yoke is coupled via the pole core. The stator of a rotating electric machine.