JPH04325848A - Stator winding of electric rotating machine - Google Patents

Abstract

PURPOSE:To reduce contact resistance at the joint of coil ends. CONSTITUTION:A plurality of strands 22 are bundled to form a strand 24 and a plurality of such strands 24 are arranged. Strand 22 groups forming respective strands 24 are then integrally jointed, around the both ends thereof, by means of a first connecting conductor 26. A plurality of strands 24 integrated by means of the first connecting conductors are then bundled and the first connecting conductors 26, arranged around the both ends of these strands 24, are integrally jointed by means of a second connecting conductor 34 thus forming the stator winding of electric rotating machine.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator winding for a rotating electrical machine, and more particularly to a stator winding for a rotating electrical machine suitable for use as a stator winding for a rotating electrical machine such as a superconducting generator.

0002

[Prior Art] In rotating electric machines such as superconducting generators, in order to reduce the size of the machine and to increase the output and efficiency of the rotating electric machine, winding is applied to the gap between the rotor and stator. A so-called air-gap winding method is used to arrange the wires. When an air-gap winding method is adopted for a rotating electrical machine, the coils that make up the windings are directly linked to the magnetic flux produced by the rotor. Therefore, if the dimensions of the strands constituting the coil are large, eddy currents induced by the magnetic flux of the rotor flow through the strands, causing the coil to become locally overheated and the windings to burn out. Therefore, in machines such as superconducting generators that have a large capacity and a large magnetic flux density in the air gap, for example, Japanese Patent Publication No. As shown in No. 1237858, published in October 1972, in order to limit the eddy current induced in the wire, a configuration was adopted in which the wires were further subdivided and bundled together to form a strand. has been done. In addition, the stator winding of a large-capacity rotating electrical machine consists of a coil made by arranging a plurality of strands formed by groups of strands in parallel and multiplexing.
Furthermore, these coils are connected in series to form a winding. Therefore, when joining coils in series, the insulation applied to each strand is removed, and the
It is necessary to integrally join a large number of strands, ranging from 00 to 300 wires.

0003

[Problems to be Solved by the Invention] In the above-mentioned prior art, a plurality of strands formed of a group of strands are arranged in parallel and multiplexed, and both ends of these strands are joined together with a connecting conductor.
Since a configuration is adopted in which multiple strands are divided into upper and lower coils and each coil is connected in series, the dimensions of the coil terminals are uneven. Therefore, it is necessary to connect each coil in series while adjusting the dimensions. Moreover, when joining both ends of a group of strands together, there are many strands to be joined, and gaps are created between the strands of each strand, resulting in a difference in the superheating temperature required for joining between each strand. Sometimes. Furthermore, due to the deformation of the strands, molten solder or the like may not sufficiently penetrate between the strands, resulting in insufficient electrical connection between the various parts. For this reason, contact resistance increases at the joints of each strand, causing local overheating, which may cause the entire coil and winding to burn out.

[0004] An object of the present invention is to provide a stator winding for a rotating electrical machine that can reduce the contact resistance between various conductors at the joint portions of the coil terminals.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention forms a strand by bundling a plurality of wires as a first stator winding, and rotates this strand with the stator core. A plurality of wires are arranged along the gap between the strands, and the peripheries of both terminals of the group of wires forming each strand are integrally joined by a first connecting conductor, and the wires are unified by the first connecting conductor. A stator winding for a rotating electric machine is constructed by bundling a plurality of strands and integrally joining the periphery of a first connecting conductor placed at both ends of each strand with a second connecting conductor.

[0006] As the second stator winding including the first stator winding, each group of strands is a stator winding of a rotating electrical machine in which a plurality of strands are bundled along the height direction of the coil. It is composed of

As a third stator winding including the first stator winding, each group of strands constitutes a stator winding of a rotating electric machine in which a plurality of strands are bundled along the width direction of the coil. This is what I did.

[0008] As the fourth stator winding including the first stator winding, each group of strands is a stator of a rotating electrical machine in which a plurality of strands are bundled along the height direction and width direction of the coil. It consists of a winding.

[0009] As the fifth stator winding including the first, second, third or fourth stator winding, in the gap between each strand and between each strand and the first connecting conductor, A stator winding of a rotating electric machine is constructed by inserting a conductive member made of metal or resin.

[0010] As a sixth stator winding including the first, second, third, fourth or fifth stator winding, an intermediate connecting member is provided between each terminal of one strand group and the other strand group. A stator winding of a rotating electric machine is constructed by inserting one strand group and the other strand group and joining them via an intermediate connecting member and a second connecting conductor.

1st, 2nd, 3rd, 4th, 5th or 6th
As the seventh stator winding including the stator winding, a stator winding of a rotating electric machine is constructed in which each strand group is inserted with a cooling pipe for cooling the strands.

0012

[Operation] When forming a coil by bundling a plurality of strands and connecting both ends of these strands in series, a specific number of strands are bundled and integrally joined by a first connecting conductor, and the first connecting conductor Since a plurality of strands are bundled together and both ends of these strands are further integrally joined by a second connecting conductor, wire forming is performed for each strand joined by the first connecting conductor. This makes it possible to easily form the strands, and it is possible to maintain the shape of the strand almost in its original shape. Furthermore, each strand can be electrically bonded sufficiently with low contact resistance. Therefore, if a plurality of strands joined by the first connecting conductor are integrally joined by the second connecting conductor, the contact resistance between the various conductors can be reduced, and local overheating will occur at the coil terminal. can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a rotating electric machine used as a superconducting generator is equipped with a rotor 10 and a stator core 12, and an upper coil 16 and a lower coil 18 are installed in slots 14 of the stator core 12. has been done. Each slot 1
When attaching the upper coil 16 and the lower coil 18 to the upper coil 16 and the lower coil 18, the ends of the upper coil 16 and the lower coil 18 are electrically connected to form a joint 20, and the upper coil 16 and the lower coil 18 are connected electrically.
are connected in series, the upper coil 16 is disposed near the gap between the rotor 10 and the stator core 12, and the lower coil 18 is disposed on the bottom side of the slot 14.

When forming the upper coil 16 and the lower coil 18, as shown in FIG. (in the vertical direction), and the outer circumferences of both ends of each strand 24 are integrally joined by a first connecting conductor 26. At this time, a conductive bonding filler 28 is filled between each strand 24 and the first connection conductor 26, and the strands 24 and the strands 24 and the first connection conductor 26 are sufficiently electrically bonded. It has become so. After this, the strands integrated with the first connecting conductor 26 are arranged in parallel in multiple directions in the height direction of the coil (horizontal direction in the paper) and in the width direction of the coil, and the coil shape is adjusted and the strands are placed between the 24 groups of strands. The connecting plate 30 and the cooling pipe 32 are inserted, and the various conductor pipes are filled with a conductive bonding filler 28. Then, the outer circumferential side of these various conductors is
They are integrally joined by the connecting conductor 34. Thereafter, the group of strands 24 is divided into an upper coil 16 and a lower coil 18, and the upper coil 16 and the lower coil 18 are respectively installed in the slot 14.

As described above, according to this embodiment, the strand 24 inserted into the second connecting conductor 34 is divided into a plurality of blocks, and the strand 24 of each block is integrated with the first connecting conductor 26. and further the first connecting conductor 26
Since a plurality of conductors are integrally joined by the second connecting conductor 34, the contact resistance between the various conductors at the joint part 22 can be reduced, and the coil can be prevented from becoming locally overheated. This makes it possible to prevent the winding from burning out, contributing to improved reliability.

Furthermore, in the above embodiment, the strand 2
4 is bundled along the width direction of the coil, but as shown in FIG. 24 and the first connecting conductor 26
By inserting a conductive bonding filler 36 made of metal or resin between the strands 24 and 24, it is possible to reduce the contact resistance between each element wire and between each strand 24, and to make each part in a good electrically bonded state. can.

Furthermore, as shown in FIG.
4 can also be bundled with different numbers of coils in the width direction.

[0019]

[Effects of the Invention] As explained above, according to the present invention,
When connecting multiple coils in series, the strand inserted into the second connection conductor is divided into multiple blocks,
Since the strands of each block are integrally joined by the first connecting conductor, and a plurality of the first connecting conductors are integrally joined by the second connecting conductor, the distance between the various conductors at the joint of each coil is Contact resistance can be reduced, the coil can be prevented from becoming locally overheated, and it can contribute to improving the reliability of the winding.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional perspective view of a main part of a superconducting generator to which a winding according to the present invention is installed.

FIG. 3 is a cross-sectional view showing another example of arrangement of strands.

FIG. 4 is a sectional view showing another example of arrangement of strands.

[Explanation of symbols]

10 rotors 12 stator core 14 slots 16 top coil 18 lower coil 20 joints 22 strands 24 strands 26 first connection conductor 28 Conductive joint filling 30 intermediate connection plate 32 cooling pipe 34 Second connection conductor

Claims (7)

[Claims] Claim 1: A plurality of wires are bundled to form a strand, a plurality of these strands are arranged along a gap between a stator core and a rotor, and both ends of a group of wires forming each strand are arranged. The periphery of each strand is integrally joined with a first connecting conductor, a plurality of strands integrated with the first connecting conductor are bundled, and the periphery of the first connecting conductor arranged at both ends of each strand is connected with a second connecting conductor. The stator winding of a rotating electrical machine is integrally joined with connecting conductors. 2. The stator winding for a rotating electrical machine according to claim 1, wherein each group of strands is a plurality of strands bundled along the height direction of the coil. 3. The stator winding for a rotating electrical machine according to claim 1, wherein each group of strands is a plurality of strands bundled along the width direction of the coil. 4. The stator winding for a rotating electric machine according to claim 1, wherein each group of strands is a plurality of strands bundled along the height direction and width direction of the coil. 5. The rotation according to claim 1, 2, 3 or 4, wherein a conductive member made of metal or resin is inserted between each strand and in the gap between each strand and the first connecting conductor. Stator winding for electrical machinery. 6. An intermediate connecting member is inserted between each terminal of one strand group and the other strand group, and one strand group and the other strand group are joined via the intermediate connecting member and the second connecting conductor. A stator winding for a rotating electric machine according to claim 1, wherein the stator winding is formed by: Claim 7: Claims 1, 2, 3, 4, and 5, wherein a cooling pipe for cooling the strands is inserted into each strand group.
Or a stator winding of a rotating electric machine according to 6.