JP2011177026A - Stator for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a stator for a rotary electric machine, capable of reducing the diameter of a stator frame, and capable of decreasing the number of components with the load distributed. <P>SOLUTION: The stator for the rotary electric machine includes iron core fastening members 2 provided on the outer periphery of a stator iron core 1, spaced apart from one another at predetermined intervals in the circumferential direction for fastening the stator iron core in the axial direction; holding rings 3 provided on the outer periphery of the stator iron core, spaced apart from one another at predetermined intervals in the axial direction, and fastening the stator iron core toward a center thereof from above the iron core fastening members; ring-shaped inner frame members 5 protruded from the inner surface of a frame that encloses the stator iron core, and spaced apart from one another at predetermined intervals in the axial direction; and elastic supporting members 6 fixed to each of edges in the axial direction of the inner frame members that are adjacent to one another, and fixed to the outer peripheries of the holding rings at the middle in the axial direction, or fixed to each of edges in the axial direction of the holding rings that are adjacent to one another, and fixed to the inner peripheries of the inner frame members at the middle in the axial direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a stator of a rotating electric machine, and more particularly to an improvement in a structure for elastically supporting a stator core on a frame.

  As a conventional rotating electrical machine stator, in a rotating electrical machine that elastically supports a stator core by a plurality of spring bars arranged in an axial direction on the circumference in the vicinity of the outer periphery of the stator core via an iron core support plate, A partition plate is installed at a position facing the outer periphery of the iron core support plate, and a predetermined deformation is suppressed between the iron core support plate and the gap plate due to the twisting based on the bending stress and excessive torque in the rotational direction of the spring bar. Some have a deflection preventing means for forming a gap (see, for example, Patent Document 1).

Japanese Patent Publication No. 3-28903 (2nd page, Fig. 1)

  In the stator of the conventional rotating electric machine as described above, although the permanent deformation due to the excessive torque is prevented by the deflection preventing means, the partition plate is installed at a position facing the outer periphery of the stator support plate. There has been a problem that the outer diameter of the is increased. In addition, since it is elastically supported by the spring bar, in order to disperse the load such as gravity and rotational torque of the stator core in the circumferential direction, the number of parts is reduced by requiring many spring bars in the circumferential direction. There is also a problem that the assembly work takes time and increases.

  The present invention has been made to solve the above-described problems of the prior art, and has an object to obtain a stator for a rotating electrical machine that can be reduced in diameter and that can reduce the number of components when distributing the load. Yes.

  A stator of a rotating electrical machine according to the present invention includes a plurality of core tightening members that are provided at predetermined intervals in the circumferential direction on an outer peripheral portion of a stator core and tighten the stator core in an axial direction, and the stator core A plurality of holding rings which are provided on the outer peripheral portion at predetermined intervals in the axial direction and hold the stator core so as to be tightened from above the core fastening member toward the central portion, and a frame surrounding the stator core A plurality of ring-shaped middle frame members projecting from the inner surface at predetermined intervals in the axial direction and the axial end surfaces of the adjacent middle frame members are fixed to each other, and the holding ring A plurality of elastic support members fixed to the outer peripheral part or fixed to the axial end surface parts of the holding rings adjacent to each other and fixed to the inner peripheral part of the middle frame member at the central part in the axial direction. It is a thing.

  In this invention, the elastic support members are fixed to the axial end surface portions of the adjacent middle frame members and fixed to the outer peripheral portion of the holding ring at the axial central portion, or the axial end surfaces of the adjacent holding rings. Since the parts are fixed to each other and fixed to the inner peripheral part of the middle frame member at the center in the axial direction, it is possible to reduce the size of the rotating electrical machine, and the structure facilitates load distribution and the number of parts. Can be reduced.

It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 1 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. (A) corresponds to a cross-sectional view taken along line I (a) -I (a) in (b). It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 2 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 3 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 4 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 5 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. It is a fragmentary longitudinal cross-sectional view which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 6 of this invention. It is a fragmentary longitudinal cross-sectional view which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 7 of this invention. It is a fragmentary cross-sectional view which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 8 of this invention. It is a figure which shows typically the principal part of the stator of the rotary electric machine which concerns on Embodiment 9 of this invention, (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view.

Embodiment 1 FIG.
Hereinafter, a stator for a rotary electric machine according to Embodiment 1 of the present invention will be described with reference to FIG. In FIG. 1, a stator of a rotating electric machine includes a cylindrical stator core 1 and a plurality of stator cores 1 that are provided at predetermined intervals in the circumferential direction on the outer periphery of the stator core 1 and tighten the stator core 1 in the axial direction. (Eight in this example) the iron core fastening member 2 and the outer periphery of the stator iron core 1 are provided at predetermined intervals in the axial direction, and the stator iron core is directed from the top of the iron core fastening member 2 toward the center portion. A plurality of (in this example, four) retaining rings 3 that are flat in the axial direction to be held as tightened, a cylindrical frame 4 that surrounds the stator core 1 with a space therebetween, and an axial direction on the inner surface of the frame 4 A plurality of ring-shaped (five places in this example) middle frame members 5 projecting in the axial direction at predetermined intervals and the adjacent middle frame members 5 are fixed to each other and held at the center in the axial direction. Multiple (four in this example) elastic support consisting of spring plates fixed to the ring 3 It has a such as wood 6.

  The illustrated stator constitutes, for example, an armature of a turbine generator. A predetermined number of axially formed slots are provided in the inner peripheral portion of the stator core 1 in the circumferential direction. Is provided with a stator coil. Further, the core tightening member 2 is formed in a trapezoidal cross section at the portion through which the stator core 1 is inserted, the protruding portions at both end portions of the stator core 1 are circular in cross section, and screws are screwed on the outer peripheral portion thereof. The stator core 1 is tightened in the axial direction from both sides by a large nut through a ring-shaped presser plate. In addition, since these structural members are the same as those of the prior art, the illustration is omitted. Moreover, the fixing | fixed part with the bearing apparatus which supports the rotor shaft which is not shown in figure is provided in the both-ends surface part of the flame | frame 4 in the axial direction. Further, the lower part of the frame 4 is firmly fixed to the foundation 7.

  The holding ring 3 is formed in a flat shape having a smaller radial dimension than the axial dimension. Before the tightening, for example, the retaining ring 3 is divided into two parts in the upper and lower directions and is tightened one by one with a tightening tool not shown. The iron core fastening member 2 is joined by welding. The elastic support member 6 is thick in the circumferential direction in order to support its own weight and rotational torque of the stator core 1, and in the circumferential direction so as not to transmit the radial vibration of the stator core 1 to the inner frame member 5. The cross section is formed in a rectangular shape with a thin cross section in the radial direction perpendicular to. Further, in the first embodiment, the elastic support member 6 has one axially extending from the middle frame member 5 on the one end side in the axial direction to the middle frame member 5 on the other end side. It consists of a long spring plate.

  Further, the axial pitch width between the inner frame members 5 and the axial pitch width between the holding rings 3 are substantially the same, and the holding ring 3 is positioned at the center of the axial pitch width between the intermediate frame members 5. It is configured. The elastic support member 6 is welded or bolted to the outer peripheral surface of the holding ring 3 having the above-described configuration, and is welded or bolted to the inner peripheral surface portion of the middle frame member 5. With this configuration, in the first embodiment, the joint between the elastic support member 6 and the holding ring 3 is located near the center position of the axial pitch width between the adjacent middle frame members 5, and the bending rigidity is reduced. Has been.

  Next, the operation of the first embodiment configured as described above will be described. A static load of the stator core 1 and a short-circuit torque due to a short-circuit accident during operation are transmitted to the elastic support member 6 via the holding ring 3 welded to the core tightening member 2. The elastic support member 6 is joined to an intermediate frame member 5 welded in the axial direction of the frame 4, and the load is supported by being transmitted from the elastic support member 6 to the frame 4 through the intermediate frame member 5. The Further, the radial vibration generated during the operation is absorbed by the bending of the elastic support member 6 in which the support pitch is the axial pitch width of the middle frame member 5 or the axial pitch width of the holding ring 3.

  As described above, in the first embodiment, no part that restricts the shape of the middle frame member 5 is attached, and the elastic support member 6 has a spring plate structure and is joined to the outer peripheral surface of the flat holding ring 3. On the other hand, since the inner frame member 5 is joined to the inner peripheral surface, a stator of a rotating electrical machine in which the inner frame member 5 and the frame 4 are reduced in diameter can be obtained. In addition, since the stator core 1 is joined to the spring plate-like elastic support member 6 via the holding ring 3, the load is distributed to each of the core fastening members 2 arranged in the circumferential direction. The number of installations in the circumferential direction of the support members 6 can be designed to be economical, and the number of installations of the elastic support members 6 is small, so that the assembly work time can be shortened.

Embodiment 2. FIG.
Next, a stator for a rotary electric machine according to Embodiment 2 of the present invention will be described with reference to FIG. In the drawings, the same reference numerals denote the same or corresponding parts. In the figure, the retaining ring 3 has a radial cross-sectional dimension that is the same as or slightly larger than that of the first embodiment, and the cross-section is formed in a substantially square shape. The elastic support member 6 is divided into elastic support members 61 to 65 in the axial direction, and the divided elastic support members 62 to 64 enter between the side surfaces of the adjacent holding rings 3 facing in the axial direction. It arrange | positions at the outer peripheral part side and is joined to the side part of these holding rings 3 mutual by welding or a volt | bolt. The elastic support members 61 and 65 at both ends in the axial direction have a cantilever structure, and are joined to the outer peripheral portion side of the side surface portion of the holding ring 3 by welding or bolts. The elastic support members 61 to 65 are joined to the inner frame surface of the inner frame member 5 by welding or bolts, as in the first embodiment. Other configurations are the same as those of the first embodiment.

  In the second embodiment configured as described above, the arrangement configuration of the retaining ring 3, the elastic support member 6, and the middle frame member 5 is substantially the same as that in the first embodiment, and thus the same as in the first embodiment. In addition, the divided elastic support members 61 to 65 are joined to the outer peripheral side of the side surfaces of the retaining ring 3, so that the thickness of the elastic support member 6 is approximately equal to that of the first embodiment. The effect that the diameter can be reduced is also obtained.

Embodiment 3 FIG.
Next, a stator for a rotary electric machine according to Embodiment 3 of the present invention will be described with reference to FIG. In the figure, the elastic support member 6 is divided into elastic support members 6a to 6d in the axial direction, and is disposed on the inner peripheral portion side that enters between the side surfaces facing each other in the axial direction of the adjacent middle frame members 5, These middle frame members 5 are joined to side surfaces of each other by welding or bolts. Note that the elastic support member 6 is joined to the outer peripheral surface of the holding ring 3 in the same manner as in the first embodiment.

  In the third embodiment configured as described above, the elastic support member 6 is divided and arranged so as to enter between the adjacent middle frame members 5 with respect to the axial direction. The further effect that the diameter can be reduced by the thickness of 6 is obtained.

Embodiment 4 FIG.
Next, a stator for a rotary electric machine according to Embodiment 4 of the present invention will be described with reference to FIG. In the figure, the elastic support member 6 is divided with respect to the axial direction, and is disposed on the outer peripheral part side that enters the left and right two parts of the figure between the side surfaces facing each other in the axial direction of the adjacent holding ring 3. These holding rings 3 are joined to the side surfaces of each other by welding or bolts. The fourth embodiment corresponds to a structure in which the elastic support members 62 and 64 divided in the axial direction in the second embodiment are left out and the other elastic support members 61, 63 and 65 are omitted. As a result, the elastic support member 6 is intermittently arranged in the axial direction, and the remaining elastic support members 62 and 64 are fixed to the adjacent holding rings 3 and fixed to the middle frame member 5 at the central portion in the axial direction. It has been configured. Other configurations are the same as those of the second embodiment.

  In the fourth embodiment configured as described above, the necessary number of elastic support members 61 to 65 (FIG. 2) are left in the necessary portions within the range permitted by the spring rigidity and strength. By arranging, the number of the elastic support members 6 in the axial direction can be optimized. In addition, the position of the axial direction which arrange | positions the divided | segmented elastic support members 62 and 64 can be made into four places of the circumferential direction, and you may make it change in the circumferential direction. For example, at the two left and right positions in FIG. 4A, the elastic support members 61 to 65 divided as in the second embodiment are arranged so as to be linearly connected in the axial direction, and the elastic support members 61 and 63 are arranged. , And 65 or the elastic support members 62, 63, and 64 may be appropriately changed as necessary.

Embodiment 5 FIG.
Next, a rotary electric machine stator according to Embodiment 5 of the present invention will be described with reference to FIG. In the figure, the elastic support member 6 is configured in a shape corresponding to that obtained by removing the divided elastic support members 6b and 6c arranged in the center of FIG. 3B according to the third embodiment. . Other configurations are the same as those of the third embodiment.
In the fifth embodiment configured as described above, the vibration absorbing effect due to the twist of the middle frame member 5 is provided by providing a portion where the elastic support member 6 is not disposed between the pitches of the middle frame member 5. Can be expected. In addition, it goes without saying that the number of elastic support members 6 can be optimized and the same effects as those of the first and second embodiments can be obtained.

Embodiment 6 FIG.
Next, a stator for a rotary electric machine according to Embodiment 6 of the present invention will be described with reference to FIG. In the figure, the elastic support member 6 is made of a polymer in which a plurality of elastic support members 6A, 6B, 6C made of spring plates are overlapped in the radial direction. For example, bolts (not shown) are inserted into the middle frame member 5 from the elastic support member 6C side and tightened to the middle frame member 5, thereby fixing the plurality of elastic support members 6A to 6C integrally. ing. On the other hand, for example, only the elastic support member 6C that is in direct contact with the holding ring 3 is fixed to the holding ring 3 by welding. A slippery material such as Teflon (registered trademark) or elastic sheets may be interposed between the elastic support members adjacent to each other in the polymerization direction. Other configurations are the same as those of the first embodiment.

  In the sixth embodiment configured as described above, the elastic support member 6 includes a plurality of elastic support members 6 (6A to 6C) that are overlapped in the radial direction. Is not transmitted, the spring rigidity is reduced in the radial direction, and a higher vibration reduction effect can be obtained. In addition, when a sheet made of a material that is slippery or elastic between elastic support members is interposed, the vibration suppressing effect is enhanced and noise can be reduced. The plurality of elastic support members 6A, 6B, and 6C have the same mechanical or physical characteristics and dimensions (thickness, that is, radial dimension, or width, that is, circumferential dimension) as materials. In addition, at least one of characteristics and dimensions may be different from each other.

Embodiment 7 FIG.
Next, a stator for a rotary electric machine according to Embodiment 7 of the present invention will be described with reference to FIG. In the drawing, the elastic support member 6 is disposed on the radially outer side (upper side in the drawing), extends from one axial end portion to the other end portion of the plurality of middle frame members 5. An elastic support member 6α made of a long spring plate fixed to the inner peripheral side and a shaft of the adjacent intermediate frame member 5 that is superposed at a position facing the holding ring 3 on the inner peripheral surface side of the elastic support member 6α. An elastic support member 6β made of a spring plate formed shorter than the length between the direction end surface portions, and interposed between the elastic support member 6β and the holding ring 3, and the axial length is longer than that of the elastic support member 6β. It consists of an elastic support member 6γ made of a short spring plate.

  The elastic support members 6α to 6γ are joined to the holding ring 3 at the central portion in the axial direction of the adjacent middle frame members 5 by bolts, welding, or the like, and both axial ends of the elastic support members 6β and 6γ are connected to each other. It is not restrained with respect to the axial direction. Further, any part of the plurality of holding rings 3 is configured in the same manner, and the four elastic support members 6 disposed in the circumferential direction are configured in the same manner. Similarly to the sixth embodiment, a slippery material or elastic sheets may be interposed between elastic support members adjacent in the polymerization direction. Other configurations are the same as those in the first embodiment.

  In the seventh embodiment configured as described above, the elastic support members 6β and 6γ superimposed on the inner peripheral surface side of the elastic support member 6α are not fixed at both ends in the axial direction. Since there is no restriction of bending deformation at the both-end fixed portions, the spring rigidity is reduced, and a higher vibration reduction effect is obtained. The seventh embodiment exemplifies a case where a long elastic support member 6α extending from one end portion in the axial direction to the other end portion of the plurality of middle frame members 5 is fixed to the inner peripheral surface of the middle frame member 5. However, the elastic support member 6α is fixed to the outer peripheral surface of the holding ring 3, the elastic support members 6β and 6γ are disposed in the opposite direction on the side facing the middle frame member 5, and the central portion in the axial direction thereof is the middle frame member. 5 may be configured to be joined.

Embodiment 8 FIG.
Next, a stator for a rotary electric machine according to Embodiment 8 of the present invention will be described with reference to FIG. In the figure, a notch 5 a for receiving a part of the outer peripheral side of the elastic support member 6 is provided on the inner peripheral part of the middle frame member 5. The notch 5a is formed to be slightly larger than the circumferential dimension of the elastic support member 6. The elastic support member 6 has a part of its thickness inserted into the notch 5a as shown in FIG. It is fixed to the member 5 by welding, bolts or the like. In FIG. 8, the stator iron core 1, the iron core fastening member 2, and the frame 4 are not shown. Other configurations are the same as those in the first embodiment.

  In the eighth embodiment configured as described above, since a part of the outer peripheral side of the elastic support member 6 enters the notch 5a provided in the inner peripheral portion of the middle frame member 5, the elasticity is increased. The diameter of the stator frame 4 can be reduced by the amount of intrusion of the support member 6.

Embodiment 9 FIG.
Next, a rotary electric machine stator according to Embodiment 9 of the present invention will be described with reference to FIG. In the ninth embodiment, the above-described first to eighth embodiments are alternately arranged one by one at substantially equal intervals in the axial direction for both the retaining ring 3 and the middle frame member 5. On the other hand, the example at the time of changing this space | interval and arrangement | positioning number is shown. In the figure, the axial interval of the retaining ring 3 is formed such that the central interval L2 is wider than the interval L1 on both ends (that is, L1 <L2). And in order to make spring rigidity equivalent to an axial direction, the middle frame member 5 arrange | positioned in the axial direction center part is comprised using the two middle frame members made to adjoin. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the ninth embodiment configured as described above, the arrangement configuration of the inner frame member 5 is also changed when the axial interval of the retaining ring 3 is partially changed. Since the spring rigidity can be ensured, it can be suitably used when the design of the mechanical characteristics of the stator is changed. Contrary to the above, L1> L2 and two middle frame members close to the side corresponding to L1 may be arranged. Further, the holding ring 3 can be appropriately changed, for example, constituted by a plurality of adjacent rings.

  In the first to ninth embodiments, the elastic support member 6 is installed in four locations in the circumferential direction, the middle frame member 5 is installed in five or six locations in the axial direction, and the ring member 3 is installed in four locations in the axial direction. Although what was installed was demonstrated, it cannot be overemphasized that the installation number of these each member, an installation position, etc. are not limited to what was illustrated above. Further, the cross-sectional shapes of the ring member 3 and the elastic support member 6 or the joining means of each member are not limited to those exemplified in the above embodiment. Furthermore, it goes without saying that the inventions of the first to ninth embodiments can be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 Stator iron core, 2 Iron core clamping member, 3 Holding ring, 4 Frame, 5 Middle frame member, 5a Notch, 6 (61-65, 6a-6d, 6A-6C, 6 (alpha) -6 (gamma)) Elastic support member, 7 Basic.

Claims (5)

  A plurality of core tightening members that are provided at a predetermined interval in the circumferential direction on the outer peripheral portion of the stator core and that clamp the stator core in the axial direction; and a predetermined interval in the axial direction at the outer peripheral portion of the stator core. A plurality of holding rings that are provided to hold the stator core so as to be clamped in the direction of the center from above the core fastening member, and an inner surface of the frame that surrounds the stator core with a predetermined spacing in the axial direction. The plurality of ring-shaped middle frame members provided and the axial end surface portions of the adjacent middle frame members fixed to each other and fixed to the outer peripheral portion of the holding ring at the axial central portion, or the adjacent holding A stator for a rotating electrical machine, comprising: a plurality of elastic support members fixed to each other in the axial end surface portion of the ring and fixed to the inner peripheral portion of the middle frame member at an axial center portion thereof.   2. The stator of a rotating electrical machine according to claim 1, wherein the elastic support member is formed in a rectangular cross-section having a circumferential dimension larger than a radial dimension of the stator core.   The stator for a rotating electrical machine according to claim 1 or 2, wherein the elastic support member is provided intermittently in the axial direction.   The stator of the rotating electrical machine according to any one of claims 1 to 3, wherein a plurality of the elastic support members are superposed in a radial direction.   A part of the plurality of elastic support members superposed in the radial direction is shorter than the length between the axial end surface portions of the adjacent holding rings or the length between the axial end surface portions of the adjacent middle frame members. The stator of the rotating electric machine according to claim 4, wherein the stator is formed.

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