JPS5989568A - Armature for superconductive rotary electric machine - Google Patents

Abstract

PURPOSE:To enhance the cooling effect of an armature winding and to reduce the size of the armature for a superconductive rotary electric machine by forming a duct piece between the armature windings to form a cooling duct, and flowing cooling medium in the duct. CONSTITUTION:Holders 3, 3' are mounted on the inner periphery of a stator frame 1, and an armature winding 4 is associated with the holders 3, 3' to form an armature. End covers 5, 5' are covered on both winding ends of the winding 4, and a can 6 is covered on the inner peripheral surface of the armature. A dust piece 7 is inserted into the space formed between the windings. Cooling medium is flowed to a cooling duct 7a formed in the internal space of the piece 7, thereby directly cooling the side face of the winding 4 which is contacted with the medium.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling structure for an armature winding of a rotating electrical machine that utilizes superconductivity.

Generally, in a normally conducting rotating electric machine, an armature winding is attached to an armature core that is a magnetic material to form an armature. In a superelectric rotating electric machine, the armature winding does not need to be supported by an iron core that is a magnetic material, but it is necessary to support the armature winding in some way. Conventionally, this method of holding the armature windings involves arranging the armature windings in combination on a cylindrical assembly jig, and inserting a spacer between adjacent windings (straight portions) in this state. The armature winding was created in a way that bound the whole thing. Then, this armature winding was supported by a holding body on the stator side to constitute an armature. However, with this armature structure, sufficient cooling was not achieved even when the cooling medium was allowed to flow in the axial direction. In other words, the outer circumferential surface and inner circumferential surface □ of the straight section l of the armature winding are cooled by the circulation of the cooling medium, but the side surface of the armature winding is not cooled, and therefore, the inner circumferential surface □ of the armature winding is cooled. The heat is confined internally and the armature winding has a poor cooling effect, which has the disadvantage that the armature has to be made larger due to the limits on the allowable temperature of the insulating material.

The purpose of this invention is to eliminate the above-mentioned drawbacks, improve the cooling effect of the armature winding of a superconducting rotating electrical machine, and reduce the size of the armature. The structure was as follows. In other words, the armature winding is supported by an annular plate-shaped insulating holder fixed to both axial ends of the stator frame of the superconducting rotating electrical machine, and the adjacent armature winding is A cooling duct is formed by embedding a tubular duct piece of non-magnetic metal #□ extending in the axial direction between the straight gland parts, and a cooling medium is allowed to flow through this cooling duct to cool the armature winding. I did it like that.

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is a longitudinal sectional view of an armature of a superconducting rotating electrical machine that is an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an external appearance of the duct piece in FIG. 2. FIG. 1 in the figure is the rotor, and the structure of the armature corresponding to it is.

Attach holder 3.3 to the inner circumference of stator frame 2.

The armature winding 4 is assembled into the holders 3, 3- to form an armature. Both winding ends of this armature winding 4 are covered by end covers 5, 5! The inner peripheral surface of the armature is covered with the can 6. The structure is such that a cooling medium such as water, oil, gas, or air can flow in the direction indicated by the arrow. When assembling the armature winding 4, the duct piece 7 is inserted into the space between the (straight portion) windings. A cooling medium is caused to flow through a cooling duct 7a formed in the internal space of this duct piece 7, and the side surface of the armature winding 4 that is in contact with this is directly cooled. Next, the details of the duct piece 7 will be explained. First, a non-magnetic metal material with good thermal conductivity is used as the material. A cooling duct (7a) formed in a space for circulating the above-mentioned refrigerant is provided inside, and a groove 7b is provided on the inner diameter side so that a retainer for holding and fixing the armature winding 4 can be attached. ing. A portion of the outer diameter side is passed through the dovetail/L' groove 7bJ and incorporated into the dovetail convex portions 3b and 3bl of the holder 3J31. This dovetail groove 7b is fitted into the dovetail protrusions 3b, 3bl of the holder 3.31 to assemble, and a non-magnetic Filling material is filled, and resin is poured into the holding bodies 3, 3I through the resin injection holes 3a #3a' and hardened together to fix the armature winding 4. The arrangement of the armature winding 4 in FIG. 2 shows the case of two-layer overlapping winding. Further, in the example shown in FIG. 1, the holder 3.3+ is a two-block structure, and there is a space ζ between the blocks. That is, the cooling medium sent from the end cover 5151 gathers and flows out through the space. This space may have one row as shown in FIG. 1, or may have multiple rows, or may have no row. If there is no row, the cooling medium may be circulated by, for example, flowing the cooling medium from the end cover 7 side and flowing out to the end cover 71 side.

As explained above, a duct piece is inserted between the ζ armature brush lines to form a cooling duct.Since the cooling medium is allowed to flow through this cooling duct, the cooling effect of the armature winding is increased and the armature size is reduced. can be converted into

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an armature of a superconducting rotating electrical machine that is an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the armature of a superconducting rotating electrical machine as seen in FIG. FIG. 3$3'; Holder, 4; Armature winding, 7: Duct piece, 7a; Cooling duct. .

Claims (1)

[Claims] 1) In an armature in which the armature winding is supported by an annular plate-shaped insulating holder fixed to both axial ends of the stator frame of a superconducting rotating electrical machine, the straight line between adjacent armature windings A superconductor characterized in that a tubular duct piece made of non-magnetic metal extending in the axial direction is embedded between the parts to form a cooling duct, and a cooling medium is allowed to flow through the cooling duct to cool the armature winding. Armature of rotating electric machine.