JP2012060767A - Rotary electric machine and stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary electric machine which reduces the manufacturing cost without impairing the efficiency of the rotary electric machine.SOLUTION: A stator of a rotary electric machine includes an iron core 17 in which through holes 14a, 14b where bolts 20 are inserted are formed, a pressure plate 13 included in the outermost layer of the iron core 17 and in which insertion holes of the bolts 20 are formed, and insulative washers 30a, 30b respectively having holes 15a, 15b which are formed so that the diameters are smaller than the diameters of the through holes 14a, 14b. The insulative washers 30a, 30b respectively have recessed parts 32a, 32b that correspond to the form of tooth parts 11 which are formed in the iron core 17 by slots 10. A clearance S is formed between an outer peripheral surface of a screw part 21 of each bolt 20 and each through hole 14a or 14b with the recessed part 32a or 32b of the insulative washer 30a or 30b fitted into the tooth part 11 of the iron core 17 and the bolt 20 inserted.

Description

  The present invention relates to a stator of a rotating electric machine applied to a railway vehicle, and particularly to a fixing means for a stator core.

  A stator of a rotating electrical machine includes an iron core formed by laminating electromagnetic steel sheets in which slots for attaching a field coil are formed on the inner peripheral side, and press plates disposed at both ends of the iron core. .

  As a method of fixing the iron core, there is a method of welding the outer periphery side of the iron core and the presser plate. In this case, the welded part becomes a conduction path, and a cage-shaped electric circuit is formed on the outer periphery of the stator. When a magnetic field is generated, an eddy current flows and loss occurs, resulting in a decrease in output and heat generation of the device. In addition, when a welding operation is performed by a person, skill is required, and if it is automated by a machine, a capital investment burden is generated. Therefore, as a method of fixing the iron core, a plurality of bolt holes are formed in the circumferential direction of the iron core and the holding plate, and the end of the bolt inserted into the bolt hole and insulated from the iron core is secured with a nut insulated from the iron core. A method of compressing the electromagnetic steel sheet to hold the shape as an iron core by tightening can be considered.

  However, if the magnetic steel sheet of the iron core moves due to vibration or electromagnetic force generated during the rotation of the rotating electrical machine, the bolt and the magnetic steel sheet come into contact when the field coil is energized, and the insulation between the bolt and the iron core is lost. There is a possibility that the efficiency of the electric machine is reduced or the rotating electric machine is damaged. Therefore, it is necessary to tighten the iron core with a sufficient compressive force so that the electromagnetic steel sheets do not shift due to factors such as electromagnetic force and vibration during operation. In particular, the stator of a rotating electrical machine applied to a railway vehicle has a very heavy structure, and thus a large fastening force is required for the bolt.

  The prior art disclosed in the following Patent Document 1 is configured so that a member in which a cylindrical member that can be fitted into a bolt hole and a flat insulating washer are integrally formed is interposed between a bolt and a presser plate. Thus, the outer peripheral surface of the cylindrical member is fitted to the inner peripheral surface of the bolt hole, and a clearance is secured between the outer peripheral surface of the bolt and the inner peripheral surface of the bolt hole.

Japanese Patent Laying-Open No. 2003-299272 (FIG. 5)

  However, in the prior art disclosed in Patent Document 1, a cylindrical member must be installed on the insulating washer, and there is a problem that the manufacturing cost of the insulating washer increases.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a rotating electrical machine and a rotating electrical machine stator that can reduce the manufacturing cost without impairing the efficiency of the rotating electrical machine. .

  In order to solve the above-described problems and achieve the object, the present invention is formed by laminating electromagnetic steel sheets, and a plurality of slots for mounting field coils on the inner periphery are formed at equal intervals in the circumferential direction. An iron core in which a through-hole into which a bolt inserted from can be inserted is formed, a press plate provided in the outermost layer of the iron core, in which the bolt insertion hole is formed, the press plate, and a bolt head of the bolt And an insulating washer having a hole formed smaller than the diameter of the through hole, the washer corresponding to the shape formed by the teeth formed on the iron core by the slot Having a convex part, fitting the convex part of the washer to the tooth part of the iron core, and inserting the bolt between the outer peripheral surface of the screw part of the bolt and the through hole Is characterized in that a gap is formed.

  According to the present invention, since the insulating washer that matches the axial center of the bolt is used at the center of the bolt through-hole formed in the iron core, the insulation of the rotating electrical machine can be maintained because the bolt and the iron core are kept in contact with each other. There is an effect that the manufacturing cost can be reduced without impairing the efficiency.

FIG. 1 is a diagram showing a configuration of one insulating washer according to the first embodiment of the present invention. FIG. 2 is a diagram showing a configuration of another insulating washer according to the first exemplary embodiment of the present invention. FIG. 3 is an AA cross-sectional arrow view showing a state in which the bolt is attached to the iron core using the insulating washer shown in FIGS. 1 and 2. FIG. 4 is a diagram illustrating a configuration of an insulating washer according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view showing a state where a bolt is attached to the iron core using the insulating washer shown in FIG. FIG. 6 is a diagram illustrating the configuration of the insulating washer according to the third embodiment of the present invention. FIG. 7 is a cross-sectional view showing a state where bolts are attached to the iron core using the insulating washer shown in FIG.

  Hereinafter, embodiments of a rotating electrical machine and a stator of the rotating electrical machine according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing the configuration of one insulating washer 30a according to the first embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of another insulating washer 30b according to the first embodiment of the present invention. FIG. 3 is an AA cross-sectional arrow view showing a state in which the bolt 20 is attached to the iron core 17 using the insulating washers 30a and 30b shown in FIG. 1 and FIG. In addition, in FIG. 1, in order to demonstrate the relationship between the hole part 15a formed in the insulating washer 30a, and the through hole 14a formed in the electromagnetic steel plate 12a, illustration of the holding plate 13 is abbreviate | omitted for convenience. Also in FIG. 2, the illustration of the presser plate 13 is omitted.

  First, the configuration of the stator of the rotating electrical machine according to the present embodiment will be described.

  1 to 3, the stator of the rotating electrical machine mainly includes an iron core 17 formed by laminating thin plate-like electromagnetic steel plates 12 a and 12 b, a bolt 20, and an insulating washer 30 a that is an insulating washer. , 30b and the presser plate 13.

  A plurality of slots 10 for mounting field coils (not shown) are formed in the inner peripheral portion of the iron core 17 at equal intervals in the circumferential direction.

  1 and 3, a plurality of through holes 14a into which bolts 20 inserted from the outside can be inserted are formed in the circumferential direction in an iron core 17 formed by laminating electromagnetic steel plates 12a. The through hole 14 a is provided at a position passing through the tooth portion 11 from the axial center of the iron core 17. In FIG. 1, only one through hole 14a is shown for the sake of simplicity, but actually, it is assumed that a plurality of through holes 14a are formed in the circumferential direction of the electromagnetic steel sheet 12a.

  2 and 3, a plurality of through holes 14b into which the bolts 20 inserted from the outside can be inserted are formed in the circumferential direction in the iron core 17 formed by laminating the electromagnetic steel plates 12b. The through hole 14 b is provided at a position passing through the slot 10 from the axial center of the iron core 17. In FIG. 2, only one through hole 14b is shown for the sake of simplicity, but actually, it is assumed that a plurality of through holes 14b are formed in the circumferential direction of the electromagnetic steel sheet 12b.

  In FIG. 3, it is assumed that a pressing plate 13 that covers the iron core 17 is disposed on the end surface of the iron core 17, and that an insertion hole for the bolt 20 is formed in the pressing plate 13.

  The insulating washers 30 a and 30 b are installed so as to be interposed between the presser plate 13 and the bolt head 22. In FIG. 3, only the presser plate 13 installed on one end side of the iron core 17 is shown, but a presser plate similar to the presser plate 13 is also installed on the other end side of the iron core 17. . The same applies to the insulating washers 30a and 30b.

  The bolt 20 is inserted into the through holes 14 a and 14 b via the insulating washers 30 a and 30 b and the presser plate 13. The length of the screw portion 21 is formed to be equal to or greater than the total length of the thickness t of the insulating washers 30a and 30b, the thickness of each presser plate 13, the thickness of the iron core 17, and the height of the nut. .

  The electromagnetic steel plates 12a and 12b are compressed via the presser plates 13 by tightening nuts (not shown). Since a frictional force is generated between the electromagnetic steel plates 12a and 12b by this compressive force, each electromagnetic steel plate 12a and 12b maintains the shape as the iron core 17.

  The hole diameter d1 of the through holes 14a and 14b is formed larger than the diameter d2 of the bolt 20. The relationship between the diameter d2 and the hole diameter d1 is preferably increased from the viewpoint of insulation and workability, and the hole diameter d1 is widened to increase the gap between the bolts 20, but the hole diameter d1 is too large. Then, the seating surfaces of the bolt head 22 and the presser plate 13 are reduced, and a large axial force cannot be applied to the bolt 20. That is, since the improvement of the frictional force between the electromagnetic steel sheets 12a and 12b cannot be expected, not only the mechanical reliability is impaired, but also the magnetic path in the iron core 17 decreases as the hole diameter d1 increases. It becomes. Therefore, it is desirable to keep the hole diameter d1 at about 1.2 times the diameter d2. Specifically, when the diameter d2 is 12 mm, the hole diameter d1 is about 14 mm. At this time, the gap s between the hole diameter d1 and the diameter d2 is about 1 mm. In FIG. 3, for the sake of convenience of explanation, the gap s is expressed larger.

  Next, the configuration of the insulating washers 30a and 30b will be described.

  In FIG. 1, the insulating washer 30a is interposed between the convex portion 32a corresponding to the shape formed by the tooth portion 11 formed on the iron core 17 by the formation of the slot 10, the press plate 13 and the bolt 20, and the through hole 14a. And a hole portion 15a formed smaller than the diameter. Further, the center of the hole portion 15a substantially coincides with the center of the through hole 14a in a state where the convex portion 32a is overlapped on the shape of the tooth portion 11 and the bolt 20 is inserted.

  In addition, although the convex part 32a formed corresponding to the shape which the three tooth parts 11 comprise is formed in the insulating washer 30a shown by FIG. 1, the shape of the convex part 32a is limited to this. For example, it may be formed corresponding to a shape formed by four or more tooth portions 11.

  In the enlarged view of the insulating washer 30a, the convex portion 32a is positioned in the shape formed by the tooth portion 11, so that the center position of the hole portion 15a substantially coincides with the center of the through hole 14a. Accordingly, the axial center position of the bolt 20 substantially coincides with the center of the through hole 14a, and a gap s is formed between the outer peripheral surface of the screw portion 21 and the through hole 14a.

  In FIG. 2, the insulating washer 30b is interposed between the convex part 32b corresponding to the shape formed by the tooth part 11 formed on the iron core 17 by the formation of the slot 10, the holding plate 13 and the bolt 20, and the through hole 14b. And a hole portion 15b formed smaller than the diameter. Further, the center of the hole portion 15 b substantially coincides with the center of the through hole 14 b in a state where the convex portion 32 b is overlapped with the shape of the tooth portion 11 and the bolt 20 is inserted.

  In addition, although the convex part 32b formed corresponding to the shape which the two tooth parts 11 comprise is formed in the insulating washer 30b shown in FIG. 2, the shape of the convex part 32b is limited to this. For example, it may be formed corresponding to a shape formed by three or more tooth portions 11.

  In the enlarged view of the insulating washer 30b, the convex portion 32b is positioned in the shape formed by the tooth portion 11, and therefore the center position of the hole portion 15b substantially coincides with the center of the through hole 14b. Accordingly, the axial center position of the bolt 20 substantially coincides with the center of the through hole 14b, and a gap s is formed between the outer peripheral surface of the screw portion 21 and the through hole 14b.

  As described above, the stator of the rotating electrical machine according to the present embodiment covers the iron core 17 in which the plurality of through holes 14 a and 14 b into which the bolts 20 can be inserted are formed in the circumferential direction, and both ends of the iron core 17. A pressing plate 13 in which insertion holes for the bolts 20 are formed, and insulating insulating washers 30a and 30b having holes 15a and 15b formed smaller than the diameters of the through holes 14a and 14b. 30b has convex portions 32a and 32b corresponding to the shape formed by the tooth portion 11 formed on the iron core 17 by the formation of the slot 10, and the center of the hole portions 15a and 15b is the convex portion 32a in the shape of the tooth portion 11. , 32b and the center of the through hole 14a, 14b are substantially aligned with the center of the through hole 14a, 14b in the state where the bolt 20 is inserted and the bolt 20 is inserted. It, it is possible to provide a gap s between the outer peripheral surface and the through hole 14a, 14b of the screw 21. Therefore, unlike the prior art, even if the cylindrical member is not installed on the flat washer, only the flat washer (insulating washers 30a and 30b) is used to form the outer peripheral surface of the screw portion 21 and the inner peripheral surface of the through hole 14a. It is possible to ensure a clearance in between. As a result, it is possible to reduce the manufacturing cost without impairing the efficiency of the rotating electrical machine. Moreover, since the structure of the washer is simplified as compared with the prior art, it is possible to reduce the environmental load accompanying the production of the stator.

  Further, as shown in FIG. 1, the insulating washer 30a according to the present embodiment has a convex portion 32a corresponding to the shape formed by the three tooth portions 11, so that the center position of the hole portion 15a is set to the through hole 14a. It is possible to accurately align with the center.

  Further, as shown in FIG. 2, the insulating washer 30b according to the present embodiment has a convex portion 32b corresponding to the shape formed by the two tooth portions 11, so that the central position of the hole portion 15b is set to the through hole 14b. In addition to being able to be accurately aligned with the center, the manufacturing cost can be further reduced because the processing is easier compared to the insulating washer 30a.

Embodiment 2. FIG.
FIG. 4 is a diagram showing a configuration of an insulating washer 30c according to the second embodiment of the present invention, and FIG. 5 shows a state in which the bolt 20 is attached to the iron core 17 using the insulating washer 30c shown in FIG. It is sectional drawing. Hereinafter, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof is omitted, and only different parts will be described here.

  First, the configuration of the stator of the rotating electrical machine according to the present embodiment will be described.

  The stator of the rotating electrical machine includes an iron core 17, a bolt 20, an insulating washer 30c, and a presser plate 13 as main components. The difference from the stator according to the first embodiment is that an insulating washer 30c is used instead of the insulating washers 30a and 30b. In FIG. 5, only the presser plate 13 installed on one end side of the iron core 17 is shown, but it is assumed that a presser plate similar to the presser plate 13 is also installed on the other end side of the iron core 17. . The same applies to the insulating washer 30c.

  The bolt 20 is inserted into the through holes 14 a and 14 b through the insulating washer 30 c and the presser plate 13. The length of the screw portion 21 is formed to be equal to or greater than the total length of the thickness t of the insulating washer 30c, the thickness of each presser plate 13, the thickness of the iron core 17, and the height of the nut. The electromagnetic steel plates 12a and 12b are compressed via the presser plates 13 by tightening nuts (not shown). Since a frictional force is generated between the electromagnetic steel plates 12a and 12b by this compressive force, each electromagnetic steel plate 12a and 12b maintains the shape as the iron core 17.

  Next, the configuration of the insulating washer 30c will be described with reference to FIGS. 4 (a) and 4 (b).

  FIG. 4A is a diagram showing a state before the bolt 20 is inserted into the hole 15c of the insulating washer 30c, and FIG. 4B is a state where the bolt 20 is inserted into the hole 15c of the insulating washer 30c. FIG.

  In FIG. 4A, the insulating washer 30c is interposed between the presser plate 13 and the bolt 20 and has a hole 15c into which the bolt 20 is inserted. In the hole portion 15c, a plurality of protrusions 31 having elasticity and extending in the central direction of the insulating washer 30c are provided so as to be able to contact the outer peripheral surface of the bolt 20 along the circumferential direction. .

  Each protrusion 31 is formed to have the same length L, and is deformed so as to fall to the iron core 17 side in contact with the outer peripheral surface of the screw portion 21 when the bolt 20 is inserted into the hole 15c. An insulating washer 30c (not shown) installed on the other end side of the iron core 17 is attached so as to be deformed to the iron core 17 side.

  The insulating washer 30c is desirably installed so that the centers of the through holes 14a and 14b coincide with the center of the insulating washer 30c. By installing the insulating washer 30c in this manner, the axial center position of the screw portion 21 can easily coincide with the center point of the through holes 14a and 14b, and the space between the outer peripheral surface of the screw portion 21 and the through holes 14a and 14b. The gap s as shown in FIG. 5 is formed.

  The inner diameter of the insulating washer 30c is not particularly limited. For example, it is desirable to set it smaller than the hole diameter d1 of the through holes 14a and 14b. In this way, when the bolt 20 is passed through the through holes 14a and 14b, each projection 31 is bent as a whole, so that the center position of the hole 15a is accurately aligned with the center of the through holes 14a and 14b. Can do.

  Further, the outer diameter of the insulating washer 30c is not particularly limited, but is formed wider than the outer diameter of the bolt head 22 so that the fastening force of the bolt 20 can be transmitted to the presser plate 13. To do. Moreover, the protrusion part 31 is not limited to three, For example, if the screw part 21 is arrange | positioned so that support is possible, four or more may be sufficient.

  As described above, the stator of the rotating electrical machine according to the present embodiment includes the insulating washer 30c that is interposed between the presser plate 13 and the bolt 20 and has the hole 15c. Since the plurality of projecting portions 31 having elasticity and extending in the center direction of the insulating washer 30c so as to be able to come into contact with the outer peripheral surface of the bolt 20 are formed, the hole portion 15c is formed. When the bolt 20 is inserted into the screw portion 21, the screw portion 21 is supported by each projection portion 31, and a gap s can be provided between the outer peripheral surface of the screw portion 21 and the through hole 14a. As a result, since a clearance can be secured between the outer peripheral surface of the screw portion 21 and the inner peripheral surface of the through hole 14a only by the annular washer (insulating washer 30c), the insulation between the bolt and the iron core, and between the nut and the iron core Insulation is obtained, the efficiency of the rotating electrical machine is not impaired, and the manufacturing cost can be reduced as compared with the stator of the rotating electrical machine according to the first embodiment.

Embodiment 3 FIG.
FIG. 6 is a diagram illustrating a configuration of an insulating washer 30d according to the third embodiment of the present invention, and FIG. 7 illustrates a state in which the bolt 20 is attached to the iron core 17 using the insulating washer 30d illustrated in FIG. It is sectional drawing. Hereinafter, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described here.

  First, the configuration of the stator of the rotating electrical machine according to the present embodiment will be described.

  The stator of the rotating electrical machine is configured to include an iron core 17, a bolt 20, an insulating washer 30d, and a presser plate 13a as main components. The difference from the stator according to the second embodiment is that an insulating washer 30d is used instead of the insulating washer 30c, and a presser plate 13a having a counterbore 16 is used instead of the presser plate 13. It is. In FIG. 7, only the presser plate 13 a installed on one end side of the iron core 17 is shown, but a presser plate similar to the presser plate 13 a is also installed on the other end side of the iron core 17. . The same applies to the insulating washer 30d.

  On the end surface of the iron core 17, a holding plate 13a covering the iron core 17 is disposed, and an insertion hole for the bolt 20 is formed in the holding plate 13a. A counterbore 16 capable of accommodating the insulating washer 30d is formed around the insertion hole.

  The bolt 20 is inserted into the through holes 14a and 14b via the insulating washer 30d and the pressing plate 13a. The length of the screw portion 21 is greater than the total length of the thickness t of the insulating washer 30d, the thickness of the holding plate 13a excluding the height of the counterbore portion 16, the thickness of the iron core 17, and the height of the nut. It shall be formed. The electromagnetic steel plates 12a and 12b are compressed through the presser plates 13a by tightening nuts (not shown). Since a frictional force is generated between the electromagnetic steel plates 12a and 12b by this compressive force, each electromagnetic steel plate 12a and 12b maintains the shape as the iron core 17.

  Next, the configuration of the insulating washer 30d will be described.

  In FIG. 6, the insulating washer 30d has a hole 15d that is interposed between the presser plate 13a and the bolt 20 and is smaller than the diameters of the through holes 14a and 14b. The center of the hole 15d substantially coincides with the center of the through holes 14a and 14b in a state where the bolt 20 is inserted.

  It is desirable that the outer diameter d4 of the insulating washer 30d is approximately equal to the diameter d5 of the counterbore 16 formed on the presser plate 13a. By setting the outer diameter d4 to be approximately the same as the diameter d5 of the counterbore 16, the center position of the insulating washer 30d accommodated in the counterbore 16 is approximately at the center of the through holes 14a and 14b. Will match. Therefore, when the bolt 20 is inserted into the hole portion 15d, the screw portion 21 is positioned on the inner peripheral surface of the insulating washer 30d, so that the axial center position of the screw portion 21 is approximately at the center of the through holes 14a and 14b. Will match. As a result, a gap s is formed between the outer peripheral surface of the screw portion 21 and the through holes 14a and 14b.

  As described above, the stator of the rotating electrical machine according to the present embodiment has a hole 15d that is interposed between the presser plate 13a and the bolt 20 and is smaller than the diameters of the through holes 14a and 14b. An insulating washer 30d is provided, and a counterbore 16 capable of accommodating the insulating washer 30d is formed around the insertion hole of the bolt 20 in the holding plate 13a, and the center of the hole 15d is in a state where the bolt 20 is inserted. Since the bolts 20 are inserted into the holes 15d, the bolts 20 are supported by the holes 15d, and the outer peripheral surface of the screw part 21 and the through holes 14a, 14b. It is possible to provide a gap s between the two. As described above, since the clearance can be ensured between the outer peripheral surface of the screw portion 21 and the inner peripheral surfaces of the through holes 14a and 14b only by the annular washer (insulating washer 30d), the insulation between the bolt and the iron core, and the nut It is possible to obtain insulation between the core and the iron core, without impairing the efficiency of the rotating electrical machine, and to reduce the processing cost of the insulating washer 30d.

  Note that the stator of the rotating electrical machine according to the first to third embodiments is filled with resin in the gap between the bolt 20 and the iron core 17 by impregnating the electric insulating resin with the bolt 20 tightened. In this way, the stator can have a more reliable structure in both mechanical strength and insulation performance. As a filling method, a method of returning the pressure to atmospheric pressure after impregnating the stator with a resin under a reduced pressure environment is conceivable.

  Further, in the stator of the rotating electrical machine according to the first to third embodiments, if a spring washer is interposed between the insulating washers 30a, 30b, 30c, 30d and the bolt head 22, the bolt 20 is tightened. In the step of impregnating the stator with an electrically insulating resin in the state, the resin is efficiently filled into the through holes 14a and 14b, and a more reliable stator can be obtained.

  The stator of the rotating electrical machine according to the first to third embodiments uses a bolt 20 and a nut to fix the iron core 17. Instead of the bolt 20, both screw bolts and both ends of both screw bolts are used. A nut to be screwed may be used.

  Moreover, the stator shown in Embodiments 1 to 3 can be applied to a general rotating electric machine, and the rotating electric machine in that case is the stator shown in Embodiments 1 to 3 and the stator. A rotor disposed in the rotor, a frame that includes the stator and the rotor, and a bearing that supports a rotor shaft disposed in the rotor are provided.

  Moreover, the stator of the rotating electrical machine shown in the first to third embodiments shows an example of the contents of the present invention, and can be combined with another known technique, and the gist of the present invention. Of course, it is possible to change and configure such as omitting a part without departing from the above.

  As described above, the present invention can be applied to a stator of a rotating electrical machine applied to a railway vehicle, and in particular, as an invention that can reduce the manufacturing cost without impairing the efficiency of the rotating electrical machine. Useful.

10 Slot 11 Tooth part 12a, 12b Electromagnetic steel sheet 13, 13a Presser plate 14a, 14b Through hole 15a, 15b, 15c, 15d Hole part 17 Iron core 20 Bolt 21 Screw part 22 Bolt head 30a, 30b, 30c, 30d Insulating washer (washer )
31 Projection 32a, 32b Projection d1 Hole diameter d2, d5 Diameter d3 Inner diameter d4 Outer diameter L Projection length s Gap t Insulation washer thickness

Claims (16)

An iron core in which electromagnetic steel plates are laminated, a plurality of slots for mounting field coils on the inner peripheral portion are formed at equal intervals in the circumferential direction, and a through hole into which a bolt inserted from the outside can be inserted;
A pressing plate provided on the outermost layer of the iron core, in which an insertion hole for the bolt is formed,
An insulating washer interposed between the press plate and the bolt head of the bolt, and having a hole formed smaller than the diameter of the through hole;
With
The washer has a convex portion corresponding to a shape formed by a tooth portion formed on the iron core by the slot,
A gap is formed between the outer peripheral surface of the screw portion of the bolt and the through hole in a state where the convex portion of the washer is fitted to the tooth portion of the iron core and the bolt is inserted. thing,
A stator of a rotating electric machine characterized by   The stator of a rotating electrical machine according to claim 1, wherein the through hole is provided at a position passing through the tooth portion from an axial center of the iron core.   The stator of a rotating electrical machine according to claim 2, wherein the convex portion is formed corresponding to a shape formed by the three tooth portions.   The stator of a rotating electrical machine according to claim 1, wherein the through hole is provided at a position passing through the slot from an axial center of the iron core.   The stator of a rotating electrical machine according to claim 4, wherein the convex portion is formed corresponding to a shape formed by the two tooth portions.   The stator of the rotating electrical machine according to any one of claims 1 to 5, further comprising a spring washer interposed between the washer and a bolt head of the bolt.   The stator of the rotating electrical machine according to any one of claims 1 to 6, wherein a center of the hole portion substantially coincides with a center of the through hole in a state where the bolt is inserted.   A stator according to any one of claims 1 to 7, a rotor disposed in the stator, a frame including the stator and the rotor, and a rotor disposed in the rotor. And a bearing for supporting the rotor shaft. An iron core in which electromagnetic steel plates are laminated, a plurality of slots for mounting field coils on the inner peripheral portion are formed at equal intervals in the circumferential direction, and a through hole into which a bolt inserted from the outside can be inserted;
A pressing plate provided on the outermost layer of the iron core, in which an insertion hole for the bolt is formed,
An insulating washer interposed between the press plate and the bolt head of the bolt, and having a hole formed smaller than the diameter of the through hole;
With
A plurality of elastic protrusions extending in the center direction of the washer so as to be able to come into contact with the outer peripheral surface of the threaded portion of the bolt along the circumferential direction;
A stator of a rotating electric machine characterized by   10. The rotating electrical machine according to claim 9, wherein when each of the protrusions is inserted into the hole, the protrusion is deformed in an insertion direction of the bolt while being in contact with the outer peripheral surface. stator.   The stator of a rotating electrical machine according to claim 9 or 10, further comprising a spring washer interposed between the washer and a bolt head of the bolt.   The stator according to any one of claims 9 to 11, a rotor disposed in the stator, a frame including the stator and the rotor, and the rotor. And a bearing for supporting the rotor shaft. An iron core in which electromagnetic steel plates are laminated, a plurality of slots for mounting field coils on the inner peripheral portion are formed at equal intervals in the circumferential direction, and a through hole into which a bolt inserted from the outside can be inserted;
A pressing plate provided on the outermost layer of the iron core, in which an insertion hole for the bolt is formed,
An insulating washer interposed between the press plate and the bolt head of the bolt, and having a hole formed smaller than the diameter of the through hole;
With
A counterbore part that can accommodate the washer is formed around the insertion hole in the press plate,
In a state where the bolt is inserted, a gap is formed between the outer peripheral surface of the screw portion of the bolt and the through hole,
A stator of a rotating electric machine characterized by   The stator of the rotating electrical machine according to claim 13, further comprising a spring washer interposed between the washer and a bolt head of the bolt.   The stator of the rotating electrical machine according to claim 13 or 14, wherein a center of the hole portion substantially coincides with a center of the through hole in a state where the bolt is inserted.   The stator according to any one of claims 13 to 15, a rotor disposed in the stator, a frame including the stator and the rotor, and the rotor. And a bearing for supporting the rotor shaft.

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