JPH05236691A - Wound rotor - Google Patents

Abstract

PURPOSE:To make a wound rotor high-speed and large-capacity by lightening the weight per unit length of the coil end part outside an iron core more than the weight per unit length of the coil inside an iron core slot. CONSTITUTION:As the conductive materials of rotor coils 2A and 2B, for example, copper of 8.0 in specific gravity is used for coil slot parts 6A and 6B, and aluminum of 2.7 in specific gravity is used for coil end part 4 (6A' and 6B'). For centrifugal force in radial direction working on the coil end part during rotation, the specific gravity is 2.7:8.9 in case that the ratio of sectional area between aluminum and copper is 10:6, so the ratio of the weight of the coil end part 4 per unit length to the coil slot parts 6A and 6B is approximately 0.5, and the centrifugal force per unit length of the coil end part 4 can be lightened to approximately half the before. Hereby, the wound rotor can be made high speed and large capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound rotor of a rotary electric machine.

[0002]

2. Description of the Related Art Among rotary electric machines, a winding type rotor having a multi-phase winding is often used in an electric motor because of its good starting characteristics and suitability for frequent starting. There is.

The structure of the end of the conventional wound rotor will be described with reference to FIGS. 4 and 5. FIG. 4 is a perspective view of a main part, and FIG. 5 is a vertical sectional view. (1) is a rotor core, (2) is a rotor winding consisting of an upper coil (2A) and a lower coil (2B), and each insulated coil (2) is provided on the outer peripheral surface of the rotor core (1). Various support members (5) are used to support the radial centrifugal force acting during rotation on the coil end portion (4) housed in the slot (3) and protruding to the outside of the iron core (1). ..

As the support member (5), there is a bind band around which a bind wire to be held by the hoop force is wound and an end ring having an integral structure. In addition, the coil support member (5) is used to provide an inner peripheral side of the coil end portion. There is also a structure in which it is fixed to a supporting member (not shown) provided on the. Generally, a copper material having a density of about 8 and 9 (g / cm ³ ) is used as a conductor of the rotor winding (2), and when a centrifugal force acts in the radial direction of the coil end portion (4) during rotation, the above support is provided. Since the member (5) receives and supports it, a surface pressure determined by the centrifugal force and the contact area is applied between the insulating surface of the coil end portion (4) and the supporting member (5).

[0005]

With the demand for high-speed and large-capacity rotary electric machines, coils (2A) above and below the rotor,
Since the size of (2B) and the energizing current increase, if the centrifugal force acting on the coil end portion (4) becomes remarkably large, the pressure applied to the coil insulating surface will become excessive and the mechanical resistance of the coil insulating will be exceeded. It could be a force field.

On the other hand, in the prior art, there is no choice but to cope with this by providing a limitation such as reducing the peripheral speed of the rotor, and as a result, the size is large, the shaft length is long, and the critical speed of the shaft system has no margin. There was a problem that it became a heavy machine and in some cases it did not work as a machine.

In view of the above problems, it is an object of the present invention to provide a wire-wound rotor for a rotary electric machine which meets the demand for high speed and large capacity and is highly reliable and economical.

[0008]

In order to achieve the above object, in the present invention, in a wire-wound rotor of a rotary electric machine, the coil end portion outside the iron core is more than the weight per unit length of the coil in the iron core slot. The rotor winding is made of a different material so as to reduce the weight per unit length, and a supporting member for supporting the rotor winding is provided.

[0009]

Since the present invention is constructed as described above, the centrifugal force per unit length of the coil end portion becomes small, so that the load on the supporting member becomes small, and the winding type rotor of a high-speed and large-capacity rotating electric machine is provided. can get.

As means for reducing the weight per unit length of the coil end portion, when the coil in the slot is made of copper material, the material of the coil end portion is aluminum, or the outer peripheral portion of the coil end is made of aluminum. There is also a means of inserting a steel wire or a copper wire into the core wire.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an axial longitudinal cross-sectional view of the end portion of the winding type rotor, in which the rotor coils (2A) and (2B) are housed in slots (3) provided on the outer peripheral surface of the rotor core (1) to connect the coils. Shows the state in which the support member (5) is provided on the coil end portion (4). Then, the rotor coil (2
Slot portions (6A) as conductive materials for A) and (2B),
Copper having a specific gravity of 8 and 9 and aluminum having a specific gravity of 2 and 7 are used in (6B) and the end portions (6A ') and (6B'), respectively.
The conductivity is approximately 60% for aluminum, assuming that copper is 100%. Therefore, in order to reduce the resistance loss of the end parts (6A ') and (6B'), the height of the end part is slightly increased. To do. The connection between copper and aluminum is made so as to be located inside the slot (3), but the method of joining dissimilar metal materials has already been put into practical use, and in this example, the required mechanical strength is obtained. The applicable method is as follows.

A) Room-temperature pressure welding method: a method in which a metal material is strongly pressed at room temperature without heating to be plastically deformed and joined.

B) Diffusion bonding method: a method in which a metal material is pressed under a temperature condition below its melting point to such an extent that plastic deformation is not generated as much as possible, and the diffusion of atoms generated between bonding surfaces is used for bonding.

By the above method, the coil slot portion (6
A), (6B) and the same end portions (6A '), (6B') are joined together, then given predetermined insulation, and rotor coils (2A) composed of upper and lower rotor coils (2A), (2B). ) Is formed and is housed in the slot (3) of the rotor core (1) to form a wound rotor.

Next, the operation of the above embodiment will be described.

During rotation, the radial centrifugal force acting on the coil end portion (4) has a specific gravity of 2.7: 8.9 when the cross-sectional area of aluminum and copper is 10: 6. The ratio of the weight to the weight of the coil slot is about
Since it is 0.5, the centrifugal force per unit length of the coil end can be reduced to about half that of the conventional method.

The mechanical strength of the coil insulation has its own limit, and although the performance has been gradually improved in recent years, it is not sufficient to meet the demands of the recent times. However, considering the mechanical proof strength of the coil insulation as a base, this embodiment can technically realize a rotary electric machine up to a mechanical strength level twice as high as the conventional one, and the peripheral speed of the rotor is relatively 2 It can be applied up to the square root of.

(Other Embodiments) As another embodiment, for example, as shown in FIGS. 2 and 3, an enlarged structural view of a rotor coil is used for the end portions (6A '), (6B') of the coil. It is possible to combine a plurality of materials by using the above-mentioned joining method or other widely used methods as materials.

For example, the end portions (6A '), (6B')
The conductor (7) is divided into a central portion (8) and an outer peripheral portion (9) thereof, aluminum is used for the outer peripheral portion (9), and a steel wire or a copper wire is used for the central portion (8).

Reference numeral (10) indicates an insulating member at the coil end portion.

When a steel wire is used for the central part (8), the strength of the coil end part (4) against centrifugal force is improved by utilizing the characteristics of the excellent mechanical strength of the steel wire. The rigidity can be increased.

When a copper wire is used in the central portion (8), the cross-sectional area of the coil end can be made smaller than that of the aluminum wire alone by taking advantage of the excellent conductivity of the copper wire. Can be improved.

[0023]

As described above, according to the present invention,
The weight of the coil end can be reduced without impairing the performance of the rotating electrical machine, and the radial and centrifugal force of the same can be reduced, which adds to the insulating surface of the coil end. There is an effect that a wound type rotor of a rotating electric machine having a higher speed and a larger capacity than before can be realized without the stress exceeding the mechanical strength of insulation of the coil end portion.

[Brief description of drawings]

FIG. 1 is an axial longitudinal sectional view of a wound rotor end portion showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a coil end portion showing another embodiment of the present invention.

3 is a cross-sectional view of FIG.

FIG. 4 is a perspective view showing a conventional wound rotor end portion.

5 is a longitudinal cross-sectional view in the axial direction of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotor core 2 ... Rotor winding 2A ... Rotor upper coil 2B ... Rotor lower coil 3 ... Slot 4 ... Coil end 5 ... Support member 6A ... Rotor upper coil slot 6B ... Rotor lower coil Slot portion 6A '... End portion of rotor upper coil 6B' ... End portion of rotor lower coil 7 ... Coil conductor 8 ... Conductor central portion 9 ... Conductor outer peripheral portion 10 ... Insulating member

Claims (1)

[Claims] 1. A winding type rotor of a rotating electric machine, wherein a material is changed so that a weight per unit length of a coil end portion outside the iron core is lighter than a weight per unit length of a coil inside an iron core slot. A wire-wound rotor comprising a wire and a support member for supporting the rotor winding.