JPH05219672A - Stator for rotating electric machine - Google Patents

Abstract

PURPOSE:To improve reliability by concentrating various vibration forces to be applied to a wedge, a support member. CONSTITUTION:A stator for a rotating electric machine has wedges 10A inserted into axial stator core grooves 7 formed at a predetermined interval on an inner peripheral side of a stator core 1 formed of a magnetic material and mounted in wedge fixing grooves 11 formed at the end of a synthetic resin support member 3 radially protruding from the core 1 and a stator coil 2 fixedly supported by the member 3 and disposed on the inner peripheral surface of the core 1. Parts of the wedges 10A protrude from the end of the member 3 to couple a plurality of support members 3a, 3b.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a rotating electric machine such as a superconducting generator, a so-called air gap winding system in which windings are arranged in a space between a rotor and a stator in order to reduce mechanical dimensions and increase power density. Has been adopted.

FIG. 4 shows a partial cross section of a rotary electric machine adopting such a winding support system. As shown in the figure, the stator core 1 is configured by laminating thin iron plates in the axial direction, and the stator coil 2 that constitutes a stator winding is arranged on the inner circumference of the stator core 1. ing. The stator coil 2 arranged on the inner circumference of the stator core 1 is supported by a support member 3 made of a non-magnetic material. The support member 3 is inserted into a stator core groove 4 provided in the stator core 1, and is firmly supported and fixed by a holding plate 5. The stator coil 2 provided with the stator coil insulation 6 is arranged at a predetermined interval on the inner peripheral surface of the stator core 1, and the wedge 10 is interposed via the upper adjusting plate 7, the intermediate adjusting plate 8 and the lower adjusting plate 9. It is supported and fixed by. The wedge 10 is inserted into a wedge fixing groove 11 provided in the support member 3 and fixed integrally. A rotating electric machine having such a structure is disclosed in US Pat. No. 3,405,297.
Japanese Patent Publication No. 3-24139.

By the way, in the air gap winding as shown in FIG. 4, since the supporting member 3 and the wedge 10 are exposed to a high magnetic flux, they are generally made of a non-magnetic material in order to prevent the loss due to the induced current. There is. Electromagnetic force acts on the stator coil 2 due to the interlinkage between the current flowing through the coil itself and the magnetic flux existing in the air gap. This electromagnetic force mainly acts in the radial direction and the circumferential direction at the center of the rotating electric machine in the axial direction and three-dimensionally at the end in the axial direction, and gives periodic vibrations to the support member 3 and the wedge 10.

[0005]

Since the stator of the above-mentioned conventional rotary electric machine is subjected to electromagnetic exciting force in each direction and is also excited by rotational vibration or the like, wear and breakage at each contact portion progress. Since it is easy to do, it needs to be firmly constructed. The stator coils are arranged at predetermined intervals in the circumferential direction of the stator, and at the same time, the phases of the currents flowing through the stator coils are different, so that the magnitude, phase, and direction of the electromagnetic force acting on each coil are different.

For this reason, when the wedges that connect the supporting members are individually arranged in the inner peripheral portion of the rotating electric machine, the supporting structure composed of the stator core, the supporting members, and the wedges has individual parallelogram shapes. It becomes a shape, and it is difficult to individually absorb the electromagnetic exciting force and the rotational exciting force as described above, and the supporting member, the wedge,
Since each stator coil behaves freely and the magnitude and direction of movement between members are different, it is difficult to reduce friction and it is difficult to maintain its strength sufficiently. For this reason, the support members, wedges, etc. vibrate due to the excitation force, and become worn and destroyed during long-term operation of the rotating electric machine, making it impossible to support and fix the stator coil, which causes serious problems such as stopping the rotating electric machine. There is a risk of causing it.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a stator of a rotating electric machine capable of improving reliability.

[0008]

The above object is achieved by constructing the wedge so that a part of the wedge protrudes from the tip of the supporting member and a plurality of supporting members are connected to each other.

[0009]

Since the above-mentioned means is provided, various kinds of exciting forces applied to the wedge and the supporting member can be integrated.

[0010]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIG. 1 shows an embodiment of the present invention. Note that the same parts as those of the related art are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the wedge 10A is configured such that a part thereof protrudes from the tip of the support member 3 and connects the plurality of support members 3a and 3b. By doing so, various exciting forces applied to the wedge 10A and the supporting member 3 are integrated, and the supporting member 3 and the wedge 10 are integrated.
It becomes possible to reduce the wear between A, and it is possible to obtain a stator of a rotary electric machine that can improve reliability.

That is, the wedge 10A is connected by straddling a plurality of support members 3a and 3b arranged in the circumferential direction, and is inserted and fixed in a wedge fixing groove 11 provided in the support member 3. In this way, the plurality of support members 3a and 3b are fixed by the wedge 10A and sequentially connected in the circumferential direction, so that the stator of the rotating electric machine is formed. In this way, a plurality of support members 3
By connecting and fixing a and 3b with the wedge 10A, the electromagnetic force generated in each stator coil 2 having a different size, phase and direction and the exciting force due to the rotational vibration are collectively received, and the support member 3 is formed. Also, the magnitude, phase, and direction of the exciting force received by the wedge 10A are averaged, so that the moving directions of the support member 3 and the wedge 10A are made uniform, and wear between the support member 3 and the wedge 10A is reduced. And the intended purpose is achieved.

As described above, according to this embodiment, a synthetic resin material such as FRP for supporting and fixing the stator coil is formed on the inner circumference of the stator core which is formed by laminating thin iron plates such as silicon steel plates in the axial direction. In a rotating electric machine such as a superconducting generator in which a so-called air gap winding method is adopted in which the created supporting member is arranged,
By using a plurality of supporting members to be fixed by one wedge, electromagnetic waves with different sizes, phases, and directions generated in each stator coil arranged at a predetermined interval on the inner circumference of the stator core of the rotating electric machine Force and the vibrational force due to rotational vibration are received collectively, and the magnitude, phase, and direction of the vibrational force received by the support member and the wedge are averaged, and the moving direction of the support member and the wedge is made uniform. It is possible to obtain a highly reliable stator for a rotating electric machine in which wear between members and wedges is reduced.

[Embodiment 2] FIG. 2 shows another embodiment of the present invention. In this embodiment, the wedge 10B has a contact surface between the wedges 10a, 10b, 10c and 10d arranged in the circumferential direction between the wedges 10a, 10b (10c, 10d).
It was arranged so as not to coincide with the axial direction of the stacking direction of B. By doing so, various exciting forces applied to the support member 3 and the wedge 10B are integrated, and the same effect as the above case can be obtained.

That is, in this embodiment, the wedge 10B is composed of wedges 10a, 10b ... Arranged in the circumferential direction of the stator core and wedges 10c, 10d ... Arranged in the axial direction. Further, the wedge 10c is arranged so as to be shifted by one stator coil in the circumferential direction with respect to the wedges 10a and 10b. Therefore, the stator coil supported and fixed by the wedge 10a includes the two stator coils fixed by the wedge 10a as well as the wedge 10c and the wedge 1.
Two stator coils supported by 0d are combined and supported and fixed. Therefore, more wedge coils can be connected and fixed in the entire wedge provided on the inner circumference of the stator core, and a plurality of support members can be connected and fixed by the wedge 10B. By consolidating various exciting forces applied to the member and the wedge, it is possible to reduce the wear between the support member and the wedge, and it is possible to obtain a highly reliable stator of the rotating electric machine. In the figure, reference numeral 12 is a support member insertion groove, and 13 is a wedge contact surface.

[Embodiment 3] FIG. 3 shows still another embodiment of the present invention. In the present embodiment, a plurality of wedges 10a, 10b, 10c, 10d, ... Are connected by wedge connecting members 14 provided on the inter-wedge contact surface 13 in the circumferential direction. By doing so, the support of the stator coil becomes firm, and the same effect as the above case can be obtained.

That is, the wedge 10a and the wedge 10b (10c and 1
0d), a wedge connecting member 14 for connecting the wedges 10a, 10b, 10c ... Is arranged at a boundary, that is, a portion of the wedge contact surface 13 to firmly support the stator coil arranged on the inner peripheral portion of the stator core. It is intended.

The support member supported and fixed by the wedge is not limited to two as in the present embodiment, but a plurality of support members can be connected, and the inner peripheral surface of the wedge is also processed into a straight line. Not only that, but it is also possible to process it into an arc along the stator core of the rotating electric machine.

Further, the wedge connecting member for connecting and fixing the wedge is not limited to the rectangular shape, and the effect can be sufficiently obtained even if the wedge connecting member has a circular shape.

[0020]

As described above, according to the present invention, since the wedge is constructed such that a part of the wedge projects from the tip of the supporting member and a plurality of supporting members are connected to each other, various wedges added to the supporting member and the supporting member. Since the excitation force is concentrated, the abrasion between the wedge and the supporting member can be reduced, and the stator of the rotating electric machine that can improve the reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a stator of an embodiment of a stator of a rotating electric machine according to the present invention.

FIG. 2 is a perspective view of a wedge of another embodiment of the stator of the rotating electric machine of the present invention.

FIG. 3 is a perspective view of a wedge of still another embodiment of the stator of the rotating electric machine of the present invention.

FIG. 4 is a cross-sectional view of a main part of a stator of a conventional rotary electric machine stator.

[Explanation of symbols]

1 ... Stator core, 2 ... Stator coil, 3, 3a, 3b ...
Support members, 4 ... Stator core grooves, 10A, 10B, 10
a, 10b, 10c, 10d ... wedge, 11 ... wedge fixing groove, 1
3 ... wedge contact surface, 14 ... wedge connecting member.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takashi Haruta 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Yutaka Higashimura 4026 Kuji-cho, Hitachi-shi, Ibaraki Stock Company Hitachi, Ltd. Hitachi Research Laboratory (72) Inventor Hiroyuki Sato 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Stock company Hitachi Ltd. Hitachi factory

Claims (3)

[Claims] 1. A stator iron core made of a magnetic material, an axial stator iron core groove provided on the inner peripheral side of the iron core at a predetermined interval, and inserted into the groove to fix the stator core. A support member made of synthetic resin that projects in the radial direction of the child core, a wedge fixing groove provided on the tip side of this member, a wedge mounted in this fixing groove, and being supported and fixed by the support member, and the fixing In a stator of a rotary electric machine having a stator coil arranged on an inner peripheral surface of a child core, the wedge has a part thereof protruding from a tip of the support member and connecting a plurality of support members. A stator of a rotating electric machine characterized by being configured. 2. The rotation according to claim 1, wherein the wedges are arranged such that inter-wedge contact surfaces in the circumferential direction of the plurality of wedges do not coincide with each other in the axial direction of the stacking direction of the wedges. Electric machine stator. 3. The stator of a rotary electric machine according to claim 2, wherein the plurality of wedges are connected by wedge connecting members provided on the inter-wedge contact surface in the circumferential direction.