JPH0744801B2 - Rotating electric machine stator - Google Patents

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 Conventional examples of a stator of a rotary electric machine are shown in FIGS. As shown in FIG. 8, the stator of the rotating electric machine has the magnetic shield 1 inside the frame,
Inside thereof, a magnetic shield 1 has a tooth 3 supported by a dovetail 2. The stator winding 5 is supported by the slot 4 formed by combining the teeth 3. The rotor 6 is housed inside the stator thus formed. In the figure, 5a is a stator winding, a part of which is omitted to show the slot 4, and 7 is a wedge for holding the stator winding 5 in the slot 4.

As shown in FIG. 9 where the cross section of the stator is shown, FIG. 9 shows the electromagnetic force generated in the stator windings. An electromagnetic force C is generated in the stator winding 5 by Fleming's law due to the influence of the magnetic field lines B of the rotating magnetic field generated by the rotor 6. The electromagnetic force C causes a stress in the circumferential direction of the stator of the teeth 3. Due to the stress in the stator 3 in the circumferential direction of the teeth 3, stress is also generated in the dovetail 2. Since this is a rotating magnetic field, these stresses appear as an exciting force during normal operation. However, this exciting force causes wear of the teeth block having the dovetail 2 and the teeth 3 inside the magnetic shield 1. Become.

FIG. 1 showing the support structure for the stator windings.
0 (see Japanese Utility Model Laid-Open No. 3-39358).
As described above, the teeth 3 made of non-magnetic metal are supported and fixed to the magnetic shield 1 by the dovetail structure.

By the way, as shown in FIG. 10, an exciting force is transmitted to the teeth 3 by an electromagnetic force generated in the stator winding 5. When the tooth block is made of non-magnetic metal, this exciting force may adversely affect the magnetic shield insulating coating 8 between the magnetic shield 1 and the dovetail portion of the tooth block, and When abrasion occurs, metal powder is generated, which may cause a short circuit accident. If the tooth block is a non-magnetic FRP material,
Such an insulation problem does not occur, and since the eddy current loss does not occur in the tooth 3 itself, the cooling duct is unnecessary. However, the FRP is weak in wear resistance, and if vibration occurs due to the exciting force received while supporting the stator winding 5, the product life will be shortened due to wear.
When a short circuit accident of the stator winding 5 occurs,
A strong electromagnetic force is applied to the teeth 3 and there is a possibility that the teeth block will be damaged if there is a stress concentration portion or the like. In the figure, 9 is insulation of the stator winding.

[0006]

The stator winding is strong due to a long-term and periodic exciting force due to the rotating magnetic field of a rotating electric machine such as a superconducting generator, and a torque due to an accident such as asynchronous input or short-circuit between wires. Stress is generated. These stresses are due to the electromagnetic force on the stator winding, and are mainly the circumferential force of the rotating electric machine. These stresses are applied to the taste of the non-magnetic material that supports the stator winding.
This force causes vibration and stress concentration in a part of the dovetail that supports the teeth on the magnetic shield, causing wear and damage to the dovetail and teeth.

If the teeth block is not firmly fixed and there is unevenness in the force for fixing the teeth block among the teeth blocks, wear due to constant vibration occurs. This causes stress concentration even during steady operation. As a result, the service life is shortened, and damage is caused by stress concentration at the time of an accident or the like.

The present invention has been made in view of the above points, and a rotating electric machine capable of preventing the teeth and dovetail portions of a teeth block supporting a stator winding from being worn or damaged. The purpose is to provide a stator.

[0009]

In order to achieve the above object, divided portions are formed in the circumferential direction between the tooth blocks, and wedges connecting the tooth blocks are driven into the divided portions (claim 1). ).

Further, a plurality of teeth blocks are connected and fixed in series in the axial direction by passing a rod through a hole provided in the teeth.

The teeth blocks are arranged so as to be offset from each other in each layer (claim 5).

Further, a plurality of tooth blocks are bonded together in the axial direction with an adhesive (claim 6).

[0013]

Since the above-mentioned means is provided, the binding force of the teeth block is generated in the dovetail portion (claim 1).

[0014] Each of the teeth will be bound to each other among the teeth (claim 3).

The positions of the teeth and the dovetails, which are susceptible to friction and stress due to the shape of the teeth block, are not aligned in the axial direction (claim 5).

[0016] Each taste is bound to each other among the teeth (claim 6).

[0017]

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

[Embodiment 1] FIGS. 1 and 2 show an embodiment of the present invention. Since the same parts as those of the prior art are designated by the same reference numerals, the description thereof will be omitted. In this embodiment, divided portions 11 are formed in the circumferential direction between the teeth blocks 10, and the wedges 1 that connect the teeth blocks 10 to the divided portions 11 are formed.
I typed in 2. By doing so, the constraining force of the teeth block 10 is generated in the dovetail portion 2, the constraint condition of the teeth block 10 is increased, and it becomes difficult to receive vibration from the stator winding. Thus, it is possible to obtain a stator of a rotating electric machine that can prevent the teeth 3 and the dovetail 2 portion of the teeth block 10 that supports the stator winding from being worn or damaged.

Since the wedges 12 having a trapezoidal cross section, that is, the surfaces M inclined with respect to the circumferential direction support the divided portions 11 provided between the teeth blocks 10, the teeth block 10 has a circumferential direction and a diameter. It will be fixed in the direction.
By driving the wedge 12a in the direction of arrow D in FIG. 2, the tooth block 10 receives a force in the direction of arrow E in FIG. Next, the wedge 12b is divided into the divisions 1 between the adjacent teeth blocks.
By driving into 1, the tooth block 10 receives a force in the direction of arrow F. As a result, it becomes possible to constrain the teeth block 10 by the dovetail 2 and the divided portion 11 of the teeth block 10, and as described above, it becomes difficult to receive vibration from the stator windings and wear is suppressed. It will be possible to be. By controlling the force of fitting by the driving force of the wedge 12, the restraining force of the teeth block 10 can be optimized at each part, and the stress due to the electromagnetic force that the teeth 3 receives from the stator winding can be dispersed. In FIG. 1, 13 is a wedge support.

[Embodiment 2] FIG. 3 shows another embodiment of the present invention. In this embodiment, a plurality of teeth blocks 10a are provided in the holes formed in the teeth 3a and the rod 1
4 were connected and fixed in series in the axial direction. By doing so, the respective teeth 3a can be connected to each other between the teeth 3a.
The mutual restraint allows the same effects as those in the above-described case.

That is, the rod 14 is passed through the hole formed in the teeth 3a, and the teeth 3a are grouped and fixed.
As a result, the stress is dispersed and the teeth block 10a
The constraint condition of is increased, the fixation of the teeth block 10a is strengthened, the concentration of stress is prevented, and the vibration is prevented, and the same effect as the above case can be obtained.

[Third Embodiment] FIG. 4 shows still another embodiment of the present invention. In this embodiment, the end ducts 15 provided at both ends of the non-magnetic material in the axial direction are collectively fixed to the plurality of teeth blocks 10a via the rods 14. That is, the teeth 3a arranged in the axial direction are grouped by the rod 14, the rod 14 is passed through to the end duct 15, and the teeth 3a are tightened by bolts 16 or the like. By doing so, the constraint of each taste 3a becomes stronger than in the case described above.

[Embodiment 4] FIG. 5 shows still another embodiment of the present invention. In this embodiment, the teeth blocks 10 are arranged so as to be offset from each other in each layer. By doing so, the positions of the teeth and the dovetails, which are susceptible to friction and stress associated with the shape of the teeth block, are not aligned in the axial direction, and it is possible to achieve the same effect as the above case.

That is, each of the taste blocks 10 is staggered, such that the layer next to the layer containing Tate 3b is Tate 3c and the layer next to the layer containing Tate 3c is Tate 3d. It was shifted and stacked on the magnetic shield 1. That is, the teeth 3b, 3c of each layer,
In 3d and the like, since the respective taste blocks 10 are alternately laminated on the respective layers, the divided portions 11a, 11b, 11c of the respective taste blocks 10 of the respective layers are not aligned in the axial direction and are not connected. Therefore, the stress generated in the teeth 3b, 3c, 3d is dispersed by the electromagnetic force generated in the stator windings, and the mechanical strength of the teeth 3b, 3c, 3d and the dovetail can be increased.

[Embodiment 5] FIG. 6 shows still another embodiment of the present invention. In this embodiment, the plurality of tooth blocks 10 are bonded together in the axial direction with an adhesive. By doing so, the respective tastes 3 are bound to each other between the tastes 3 and the same effect as the above case can be obtained.

That is, when the teeth block 10 is laminated, the overlapping surface of the teeth block 10 is adhered with an adhesive 17,
This is a grouping of the teeth 3 in the axial direction. As a result, as described above, the teeth 3 are bound to each other.

[Embodiment 6] FIG. 7 shows a taste block used in this embodiment. FIG.
The teeth blocks 10b and 10c shown in FIG.
Those having a plurality of teeth can be implemented in any of the embodiments of claim 1, claim 3, claim 4, claim 5, and claim 6. Alternatively, it is possible to carry out several items in any combination thereof. A single-taste one such as the taste block 10d shown in FIG.
It is possible to implement claim 6 or to implement several items in any combination. A single-taste block such as the taste block 10e shown in FIG. 7D can be implemented with respect to claims 3, 4, and 6.

As described above, according to this embodiment, the conventional FR
The wear and damage, which were the weak points of P, are increased by increasing the restraint of the teeth block, so that the friction and stress concentration of the teeth block due to vibration are suppressed and prevented, and the life and reliability of the teeth block are extended. It is possible to easily improve the property. In particular, when the teeth blocks are arranged so as to be shifted for each layer, or when the teeth blocks in the axial direction are bonded and laminated with an adhesive, the steps can be carried out with almost the same number of steps during assembly.

[0029]

As described above, according to the present invention, the teeth and the dovetail of the teeth block supporting the stator winding are prevented from being worn or damaged, and the teeth block supporting the stator winding is prevented. It is possible to obtain the stator of the rotating electric machine that can prevent the teeth and the dovetail from being worn or damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a support structure for a teeth block of an embodiment of a stator of a rotating electric machine according to the present invention.

FIG. 2 is a perspective view of the wedge, and FIG. 2B is a perspective view showing a state when the wedge is inserted into the dividing portion, similarly showing the fixation by the wedge of the embodiment.

FIG. 3 is a perspective view showing a support structure of a teeth block of another embodiment of the stator of the rotating electric machine of the present invention.

FIG. 4 is a perspective view showing a structure for supporting a teeth block of still another embodiment of the rotating electric machine according to the present invention.
(B) is a side view.

FIG. 5 is a perspective view showing a state where a stator block of a rotating electric machine according to another embodiment of the present invention is laminated on a magnetic shield of a teeth block.

FIG. 6 is a perspective view showing a support structure of a teeth block of still another embodiment of the stator of the rotating electric machine of the present invention.

FIG. 7 shows a teeth block used in the stator of the rotating electric machine of the present invention, (a) having a plurality of teeth, (b) having a plurality of teeth, and (c).
And (d) are front views of those having a single taste.

FIG. 8 is a perspective view showing a mounting state of a stator winding of a stator of a conventional rotating electric machine.

FIG. 9 is a cross-sectional view of a stator showing a generation state of electromagnetic force of a stator of a conventional rotating electric machine.

FIG. 10 is a vertical sectional side view showing a supporting state of a stator winding of a stator of a conventional rotating electric machine.

[Explanation of symbols]

1 ... Magnetic shield, 2 ... Dovetail, 3, 3a, 3b,
3c, 3d ... Taste, 4 ... Slot, 5 ... Stator winding 10, 10a, 10b, 10c, 10d, 10e ...
Teeth block, 11, 11a, 11b, 11c ... Dividing part, 12, 12a, 12b ... Wedge, 14 ... Rod, 15
... end duct, 17 ... adhesive.

Front page continuation (72) Inventor Yasuomi Yagi 3-1-1, Sachimachi, Hitachi City, Ibaraki Hitachi Ltd. inside Hitachi factory (72) Inventor Rei Okawa 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo (72) Inventor Yutaka Higashimura 4026 Kujimachi, Hitachi City, Ibaraki Prefecture Hitachi Research Laboratory, Hitachi, Ltd.

Claims (6)

[Claims] 1. A ring-shaped magnetic shield for preventing magnetic flux from a rotating field from leaking to the outside, and a non-magnetic body mounted inside the magnetic shield and forming a slot for inserting a stator winding. And the non-magnetic material is a tooth,
In a stator of a rotating electric machine, a plurality of teeth blocks having dovetails are laminated in a circumferential direction and an axial direction, and the teeth blocks and the magnetic shield are connected via the dovetails. A stator for a rotating electric machine, characterized in that divided portions are formed in a circumferential direction between the YEs blocks, and wedges connecting the tooth blocks are driven into the divided portions. 2. The stator for a rotary electric machine according to claim 1, wherein the wedge has a trapezoidal cross section. 3. A ring-shaped magnetic shield for preventing the magnetic flux from the rotating field from leaking to the outside, and a non-magnetic body mounted inside the magnetic shield and forming a slot for inserting a stator winding. And the non-magnetic material is a tooth,
A plurality of teeth blocks having dovetails are laminated in a circumferential direction and an axial direction, and the teeth blocks and the magnetic shield are connected to each other via the dovetails. A stator for a rotary electric machine, characterized in that individual teeth blocks are connected and fixed in series in the axial direction by passing a rod through holes provided in the teeth. 4. The rotation according to claim 3, wherein the stator is one in which end ducts provided at both axial ends of the non-magnetic body are fixed together with the plurality of taste blocks via the rods. Electric machine stator. 5. A ring-shaped magnetic shield for preventing the magnetic flux from the rotating field from leaking to the outside, and a non-magnetic body mounted inside the magnetic shield and forming a slot for inserting a stator winding. And the non-magnetic material is a tooth,
In a stator of a rotating electric machine, a plurality of teeth blocks having dovetails are laminated in a circumferential direction and an axial direction, and the teeth blocks and the magnetic shield are connected via the dovetails. A stator for a rotating electric machine, wherein the Y-s blocks are arranged so as to be offset from each other in each layer. 6. A ring-shaped magnetic shield for preventing magnetic flux from a rotating field from leaking to the outside, and a non-magnetic body mounted inside the magnetic shield and forming a slot for inserting a stator winding. And the non-magnetic material is a tooth,
A plurality of teeth blocks having dovetails are laminated in a circumferential direction and an axial direction, and the teeth blocks and the magnetic shield are connected via the dovetails. A stator of a rotary electric machine, wherein the individual tooth blocks are bonded together in the axial direction with an adhesive.