JPS5822554A - Magnetic wedge for rotary electric machine - Google Patents

Abstract

PURPOSE:To let a magnetic wedge have elasticity for increasing mechanical strength, to make easy to insert into a slot, and to improve characteristics, by a method wherein the magnetic wedge comprises non-crystalline magnetic material, and is molded by utilizing an organic binder. CONSTITUTION:A magnetic wedge for inserting into an opening of an open slot or semi-closed slot 2 comprises non-crystalline magnetic lamellas or non-crystalline magnetic fibers as main material, and is molded by utilizing an organic binder. the resultant magnetic wedge is improved in its operation efficiency and torque characteristic to the extent more than equal to those of ferrite wedges.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotating electric machine such as an electric motor or a generator that has an iron core having an open slot type or semi-closed type slot structure, in which the opening of a slot in which a winding is arranged is closed. The present invention also relates to a magnetic wedge for a rotating electric machine for improving characteristics.

In general, it is already known that magnetic wedges are used in rotating electric machines for the purpose of improving operating efficiency.

Fig. 1 shows a structure in which a stator winding 3 is arranged in a semi-closed slot 2 of a stator 1 of a rotating electric machine, and a magnetic wedge 4 is inserted into the opening of the slot 2. As such, materials such as those made of iron powder, glass fiber, and resin molded into a wedge shape, and ferrite bulk are being considered.

In the case of a ferrite wedge, the operating efficiency is significantly improved by about 4 inches compared to the case without a wedge, but it has low mechanical strength, so it easily breaks, and it is difficult to insert into the slot, and it is not reliable. It had the disadvantage of low quality. On the other hand, in the case of a wedge made of iron powder, the operating efficiency is improved, but the torque at startup is reduced. On the other hand, it has very high mechanical strength, is elastic, does not break easily, and has good insertability.

The present invention improves both of the above drawbacks, and by using an amorphous magnetic material as the main material, it provides elasticity, improves mechanical strength and ease of insertion into slots, and improves reliability. In addition, the present invention aims to provide a magnetic wedge for a rotating electrical machine that can achieve improvements equivalent to or better than those of ferrite in terms of operating efficiency and torque characteristics.

Examples of the magnetic wedge for rotating electric machines of the present invention will be described below.

[Example 1] Amorphous magnetic ribbons were laminated and molded into a shape as shown in FIG. 2 using an organic binder. When such a magnetic wedge for rotating electric machines was applied to a standard three-phase induction motor (750W rating), the efficiency was 78.0%.

[Example 2] Amorphous magnetic fiber was used as the main material, iron powder was added thereto, and an organic binder was further used to mold the fiber into the shape shown in FIG. 2, for example. When such a magnetic wedge for rotating electric machines is applied to a standard three-phase induction motor (750W rating), the efficiency is 7.
It was 7.6chi.

The table below shows the efficiency for Examples 1 and 2 without a wedge.
A comparison is shown between an iron powder molded wedge made of iron powder and glass fiber molded with resin, and a ferrite wedge.

(However, when a wedge of the same shape is used in a standard three-phase induction motor) As can be seen from the table above, in the case of Examples 1 and 2, the efficiency is equal to or higher than that of the conventional ferrite wedge, and the mechanical It is far superior to ferrite wedges in terms of strength and ease of insertion into slots. That is, in Examples 1 and 2, since an amorphous magnetic material is used as the main material, it has elasticity, can increase mechanical strength, and can be smoothly inserted into the slot.

As a result, reliability also increases.

It is clear that the outer shape of the magnetic wedge for a rotating electrical machine of the present invention can be changed as appropriate depending on the type of rotating electrical machine and the shape of the slot.

As described above, according to the present invention, the rotating material has elasticity, has high mechanical strength, has good insertability, and can improve operating efficiency and torque characteristics to the same level or higher than that of ferrite. A magnetic wedge for electrical machinery can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a structure in which a magnetic wedge is arranged in a slot of a rotating electrical machine, and FIG. 2 is a perspective view showing the outer shape of an embodiment of the magnetic wedge for a rotating electrical machine according to the present invention. 2...Slot, 4...Magnetic wedge. Patent applicant Tokyo Denki Kagaku Kogyo Co., Ltd. Representative Patent attorney Takashi Murai Figure 1 Figure 2

Claims (1)

[Claims] (1) In a magnetic wedge for a rotating electric machine that closes the slot opening of a rotating electric machine equipped with an iron core having a slot structure such as an open slot type or a semi-closed type, an amorphous magnetic ribbon or amorphous magnetic fiber is used. A magnetic wedge for rotating electric machines characterized by being molded with an organic binder as the main material.