JPH07184338A - Rotating machine rotor - Google Patents

Abstract

(57) [Abstract] [Purpose] Rotation of a rotating electric machine that can protect the binding part of a large-sized rotor with a coil end supported with sufficient strength from combustion to protect it from damage due to centrifugal force in rotation. Provide a child. [Structure] A coil end 5 protruding outward from a groove of an iron core is fixed with a binding material of organic chemical fiber, and a nonflammable coating layer 7 is formed around the binding material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotary electric machine, and more particularly to the rotation of a rotary electric machine such as a variable speed generator, a DC machine or an induction motor having a coil end portion provided with a bind wire. It is about children.

[0002]

2. Description of the Related Art Generally, a rotor employed in, for example, a variable speed generator, a wound-rotor induction machine, a direct current machine or the like has a coil end portion projecting from an end portion of a rotor core, and is fixed to the rotor core. There are a method using a U-shaped bolt and a method using a bind wire.

FIG. 2 shows an example in which the bind line is used. That is, around the rotor shaft 10,
An iron core 3 formed by laminating thin iron plates is provided, and a coil 4 is wound and housed in a groove of the iron core.

The end 5 of the coil 4 is formed so as to project from the end of the iron core 3. An end ring 6 is provided on the inner peripheral side of the coil end, and a bind 2 is provided on the outer peripheral side of the coil end 5. Is prevented from moving outward by the centrifugal force of the rotor.

A wire made of stainless steel is generally used as the bind 2, and the wire is wound around the outer circumference of the coil end 5 in multiple layers.

However, in the case of this type, when the centrifugal force becomes large due to the increase in the rotation speed and the increase in the radius of the rotor due to the high speed and large capacity of the rotating electric machine, the self-weight of the bind also increases, that is, the bind. The centrifugal force applied to the part itself also becomes large, and it becomes necessary to increase the binding thickness in terms of strength, which is disadvantageous in terms of cost and weight.

For this reason, recently, the binding of the coil end has been constructed by using a chemical fiber having a large specific strength, such as aramid.

[0008] As a related article, there is JP-A-63-124741.

[0009]

By using the chemical fiber for the binding as described above, the weight of the binding itself is reduced, and the weight and the man-hour can be reduced. further,
Although it is also advantageous in terms of manufacturability and cost of the rotor, this aramid is flame-retardant (the limit oxygen index (LOI) indicating the flammability is about 25%), but the binding part is heated for some reason. In this case, the binding material itself may burn depending on the form of fiber and the situation.

For example, when the insulation of the coil is damaged during the operation of the generator, the potentials of the adjacent coils are different, and there is a possibility that discharge may occur along the outer surface of the coil due to the difference and the distance between the coils. When the discharge is continuously generated, the side surface of the coil is heated and the member forming the insulation burns. Here, when the bind made of chemical fiber is in direct contact with the coil, there is a possibility of burning depending on the condition although it is flame-retardant.

Also, during generator installation work or repair work, some heat such as sparks is continuously applied to the coil end,
When locally heated, some of the binding may burn. In either of the above cases, the binding that supports the coil end against the centrifugal force due to rotation is damaged, and thus the coil end may not be protected from damage due to the centrifugal force due to rotation.

The present invention has been made in view of the above, and an object thereof is to prevent centrifugal force of rotation by preventing a binding portion of a large rotor having a coil end supported with sufficient strength from burning. An object of the present invention is to provide a rotor of this kind of rotating electric machine that can be protected from damage by

[0013]

That is, according to the present invention, the coil end projecting outward from the groove of the iron core is fixed with a binding material of organic chemical fiber, and the periphery of the binding material is covered with a non-combustible material. This is to achieve the initial purpose.

[0014]

In the rotor thus formed, the binding material of the organic chemical fiber has an increased incombustibility due to the non-combustible material coated on the periphery of the binding material, and thus is supported with sufficient strength. It is possible to prevent the binding portion of a large-sized rotor having a coil end from burning and protect the coil end portion from damage due to centrifugal force of rotation.

[0015]

EXAMPLE An example of the present invention will be described below with reference to FIG.

Reference numeral 1 is a rotor having a coil in a rotor core groove, and 2 is a bind made of high-strength chemical fiber. An iron core 3 is composed of thin iron plates laminated in the axial direction. Reference numeral 4 is a coil, which is placed in a groove provided in the iron core 3. Reference numeral 5 denotes a coil end, which is fastened and fixed by the bind 2. An end ring 6 supports the coil end from the inside in the radial direction against the tightening force of the bind 2.

Reference numeral 7 denotes a non-combustible coating layer, which is wound around the inner peripheral portion, the outer peripheral portion and the axial end surface of the bind 2 and covers the entire periphery of the bind.

The nonflammable coating layer 7 has, for example, LOI ≧ 30.
% Glass roving is used.

[0019] In this way, it is advantageous for external heat penetration and heating of the coil, and it is possible to prevent the spread of heat to the binding, so that even if the coil is damaged or an external heating source is present, The binding material of organic chemical fiber has increased incombustibility due to the non-combustible material that is covered around it, prevents the binding portion of the rotor with the coil end supported with sufficient strength from burning, and protects the coil end. Can be protected from damage due to centrifugal force of rotation.

In the above description, the glass roving is used to form the non-combustible coating layer 7. However, the glass roving is not always required to be used, and the non-combustible coating layer is formed. In addition to this, a sheet-like material made of a non-combustible material may be wound, or a non-combustible coating layer may be formed by coating with a solvent and drying.

[0021]

As described above, according to the present invention, it is possible to sufficiently prevent the combustion of the binding portion of a large-sized rotor having a coil end, and to protect the rotor from damage due to centrifugal force of rotation. I can.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a main part of a rotor of a rotary electric machine according to the present invention.

FIG. 2 is a vertical sectional side view showing a main part of a rotor of a conventional rotary electric machine.

[Explanation of symbols]

1 ... Rotor, 2 ... Binding, 3 ... Iron core, 4 ... Coil, 5
... coil end, 6 ... end ring, 7 ... roving (non-combustible coating layer).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuhiro Takahashi 1 Higashishinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. (72) Yoshifumi Tezuka 1 Higashishin-cho, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Ltd. (72) Inventor Hiroaki Shimomura, Chubu Electric Power Co., Inc., 1 Higashishinmachi, Higashi-ku, Nagoya-shi, Aichi

Claims (3)

[Claims] 1. A rotor of a rotary electric machine, comprising a coil end portion axially protruding from a groove of a rotor core, and fixing the coil end portion with a binding material of organic chemical fiber, wherein A rotor of a rotating electric machine, characterized in that the material is covered with a non-combustible material. 2. A rotor of a rotating electric machine, comprising a coil end projecting outward from a groove of a rotor core, and fixing the coil end with a binding material of organic chemical fiber, wherein the binding material is A rotor of a rotating electric machine, characterized in that a non-combustible layer is formed around a non-combustible material. 3. The rotor of a rotating electric machine according to claim 2, wherein the non-combustible layer is formed by glass roving.