JP2004088876A - Rotor for dynamo electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable dynamo electric machine capable of improving a radiating effect from a field coil, a damper bar and a short-circuited conductor and attaining size and weight reductions. <P>SOLUTION: This rotor for the dynamo electric machine with a plurality of protruding pole cores disposed on the outer-periphery part of a rotor yoke and a field coil wound around the pole core, is coated with coating having properties excellent in radiation, heat resistance and insulation for the surface of the field coil. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor of a rotating electric machine, and more particularly to a rotor of a rotating electric machine in which an insulator used for a field coil is improved.
[0002]
[Prior art]
FIG. 3 is a cross-sectional view of a conventional salient pole type rotor. Usually, the salient pole type rotor adopts a configuration in which a magnetic pole 2 is connected to an outer peripheral portion of a rotor yoke 1 by a dovetail 3, as shown in FIG. The magnetic pole 2 is formed by forming a flat rectangular copper band by flat hit winding (edgewise) using a form frame, or by welding a field copper coil formed by welding a previously bent rectangular copper band. 5, and inserted between the field coil 4 and the pole head 6-1 and between the field coil 4 and the rotor yoke 1 with insulating collars 7, 8 respectively. I have. The cylindrical insulator 5 and the insulating collars 7 and 8 provide main coil insulation between the field coil 4 and the magnetic pole core 6, the magnetic pole head 6-1 and the rotor yoke 1.
[0003]
Further, in order to prevent the field coil 4 itself from being deformed by the centrifugal force acting on the field coil 4 during operation of the rotating electric machine, a V-shaped space formed between the adjacent magnetic poles 2 is formed. A plurality of coil brackets (coil holders) 9 are arranged along an axial direction of the rotor via an insulating plate 10, and are fixed to the rotor yoke 1 by fastening bolts 11.
[0004]
A braking winding (also referred to as a damper bar in the present invention) 12 also serving as a starting winding is inserted in the axial direction into a slot 6-2 formed near the surface of the pole head 6-1. 12 are electrically short-circuited by short-circuit conductors 13 respectively.
A varnish is applied to the outer peripheral surface of the field coil 4, the surfaces of the damper bar 12 and the short-circuit conductor 13 for rust prevention.
[0005]
[Problems to be solved by the invention]
During operation of the salient-pole type rotating electric machine thus configured, the amount of heat generated by the field current is radiated to the magnetic pole core 6 via the cylindrical insulator 5 and the insulating plate 10 and the outer periphery of the field coil 4 The heat is radiated directly from the surface, and the amount of heat generated in each damper bar 12 when the rotating electric machine is started is radiated to the magnetic pole core 6.
[0006]
However, since the tubular insulating plate 5 and the insulating plate 10 have poor thermal conductivity, heat transfer from the field coil 4 to the magnetic pole core 6 is hindered, and the temperature of the field coil 4 rises, resulting in an increase in temperature. There is a concern that the insulation deterioration of the field coil 4 may progress.
[0007]
As described above, a varnish is applied to the surfaces of the damper bar 12 and the short-circuit conductor 13 for rust prevention treatment. However, this varnish also has a small heat radiation effect and impedes cooling by heat radiation. This is a factor that hinders miniaturization and weight reduction of electric machines.
[0008]
SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the related art, it is an object of the present invention to provide a small-sized and light-weight highly reliable rotating electric machine that enhances the heat radiation effect from a field coil, a damper bar and a short-circuit conductor.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention of a rotor for a rotating electric machine according to claim 1 includes a plurality of magnetic pole cores protrudingly arranged on an outer peripheral portion of a rotor yoke, and a field coil wound around the magnetic cores. In a rotor of a rotating electric machine configured by mounting, a paint having excellent heat dissipation, heat resistance, and insulation properties is applied to the surface of the field coil.
According to the present invention, the rust prevention effect can be obtained without applying varnish to the field coil, and the heat radiation effect from the outer peripheral surface of the field coil can be further improved.
[0010]
The invention of a rotor for a rotating electric machine according to claim 2 is the invention according to claim 1, wherein the main coating of the coil between the field coil and the magnetic pole core, the magnetic pole head, and the rotor yoke is performed by the paint. Features.
[0011]
According to the present invention, the insulating layer formed of the paint replaces the cylindrical insulator and the insulating collar around the field coil, so that the field coil space factor can be improved and the insulator is added to the paint. By unifying, the number of parts can be reduced, which can contribute to quality improvement.
[0012]
According to a third aspect of the present invention, there is provided a rotor for a rotating electric machine, wherein a plurality of magnetic pole cores are protruded and arranged on an outer peripheral portion of a rotor yoke, and a field coil is wound around the magnetic core. In the rotor of the electric machine, it has excellent heat dissipation, heat resistance, and insulation properties with respect to the surfaces of the plurality of damper bars inserted into the slots provided in the magnetic pole head and the short-circuit conductors connecting the damper bars. It is characterized by applying a paint having characteristics.
[0013]
According to the present invention, it is possible to obtain a rust-preventive effect without applying varnish to the surface of the damper bar and the short-circuit conductor. Temperature rise can be reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a rotor of a rotating electrical machine according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a rotor of a rotating electric machine, and FIG. 2 is a bird's-eye view of a magnetic pole. Note that parts common to those in FIG.
[0015]
In FIG. 1, a field coil 4A according to the present invention is formed by flat-winding a rectangular conductor using, for example, a formwork, and then applying a paint 14 having excellent heat dissipation, heat resistance and electrical insulation on the entire surface thereof. , And solidified by drying, and the insulating layer of the solidified paint performs coil main insulation in place of the conventional cylindrical insulator and insulating collar. The paint 14 is, for example, a liquid ceramic paint such as “Liquid Ceramic-Serac α1500” sold by Shellac Corporation.
[0016]
In order to prevent a gap from being formed in the contact surface with the pole core 6 and the rotor yoke 1 in a state where the field coil 4A thus formed is inserted into the pole core 6, the paint 14 is pressed between the contact surfaces. It is good to pour in.
[0017]
As described above, as a result of applying the paint 14 on the entire peripheral surface of the field coil 4A to form the insulating layer, the heat generated in the field coil 4A is transferred to the inner peripheral magnetic pole head 6-6 in contact with the magnetic pole core 6. 1 is transferred from the upper end face in contact with the rotor yoke 1 and the lower end face in contact with the rotor yoke 1 without being interrupted by the magnetic pole core 6 and the rotor yoke 1, and the outer peripheral face in contact with the coil bracket 9 is directly radiated to the atmosphere. Therefore, the temperature of the field coil is not increased unlike the related art.
[0018]
On the other hand, in FIGS. 1 and 2, the paint 14 is applied by a predetermined thickness to a portion of the surface of the damper bar 12 which is to be inserted into the slot excluding both ends, and is dried and solidified. After drying and solidification, it is inserted into the slot. Thereafter, both ends of the damper bar 12 are welded to the short-circuit conductor 13, and the paint 14 is applied to an unpainted portion including the welded portion and dried and solidified.
[0019]
As a result, the paint 14 can provide a rust-preventive effect on the damper bar 12 and the short-circuit conductor surface 13 and improve the heat radiation effect from the outer peripheral surface, so that the temperature of the damper bar 12 and the short-circuit conductor 13 at startup can be improved. The rise can be reduced.
[0020]
Generally, when miniaturizing a salient-pole type rotor, the temperature rise of the rotor field coil tends to hinder, but as in the present invention, the entire surface of the field coil has heat radiation, heat resistance, and insulation properties. By applying the coating material 14 having excellent characteristics, the heat radiation effect is higher than that of a conventional field coil having the same dimensions, so that an extra field current can flow and the output can be increased. . Conversely, in the case of the same output, not only the size and weight of the rotor can be reduced, but also the reliability of the rotating electric machine can be improved. In addition, since insulators (cylindrical insulators, insulating collars) around the field coil can be omitted, the space factor of the field coil can be improved, and by unifying the insulator with the paint, Since the number of parts can be reduced, it is possible to contribute to improvement in quality.
[0021]
Note that the present invention is not limited to the above-described embodiment only. Of the rotor, only the magnetic pole head 6-1 is separately formed, and the portion excluding the magnetic pole head 6-1 is integrated. Even in the formed so-called lumped rotor, as described above, it is possible to apply a paint having excellent heat dissipation, heat resistance and insulation properties to the surface of the field coil 4.
[0022]
【The invention's effect】
As described above, according to the present invention, a paint having excellent heat dissipation, heat resistance, and insulation properties is applied to the surface of a field coil, a damper bar, and a short-circuit conductor of a rotor of a rotating electric machine. Since the insulating layer is formed in this manner, the cylindrical insulator and the insulating collar in the conventional device can be omitted. As a result, the heat radiation effect is further enhanced, so that the reliability of the rotating electric machine with respect to the temperature is increased, and the size and weight of the rotor can be further reduced.
[0023]
In addition, by applying a paint having excellent heat dissipation, heat resistance, and insulation properties to the damper bar and short-circuit conductor, the heat dissipation effect from the outer peripheral surface is improved, and the damper bar and short-circuit conductor at start-up Temperature rise can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotor of a rotary electric machine according to a first embodiment of the present invention.
FIG. 2 is a bird's-eye view of magnetic poles of the salient-pole rotating electric machine according to the embodiment of FIG. 1;
FIG. 3 is a cross-sectional view of a rotor of a conventional rotating electric machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotor yoke, 2 ... Magnetic pole, 3 ... Dovetail, 4A ... Field coil, 5 ... Cylindrical insulator, 6 ... Magnetic pole core, 6-1 ... Magnetic pole head, 7, 8 ... Insulating collar, 9 ... Coil bracket, 11: tightening bolt, 12: damper bar, 13: short-circuit conductor, 14: paint,

Claims (3)

On the outer periphery of the rotor yoke, a plurality of magnetic pole cores are protruded and arranged, and in a rotor of a rotating electric machine configured by winding a field coil around the magnetic pole core,
A rotor for a rotating electric machine, wherein a paint having excellent heat dissipation, heat resistance and insulation properties is applied to the surface of the field coil. The rotor of a rotary electric machine according to claim 1, wherein the main insulation of the coil between the field coil and the magnetic pole core, the magnetic pole head, and the rotor yoke is performed by the paint. On the outer periphery of the rotor yoke, a plurality of magnetic pole cores are protruded and arranged, and in a rotor of a rotating electric machine configured by winding a field coil around the magnetic pole core,
Apply a paint with excellent heat dissipation, heat resistance, and insulation properties to the surface of each of the multiple damper bars inserted into the slots provided in the pole head and the short-circuit conductor that connects between the damper bars A rotor of a rotating electrical machine characterized by:

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