JP6473111B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  The rotating electrical machine has a rotor and a stator. The presence of magnetic flux that spans both the rotor core of the rotor and the stator core of the stator causes rotational torque in the motor and voltage in the generator.

  On the other hand, since the rotor core rotates and the stator core is stationary, the outer peripheral surface of the rotor core and the inner peripheral surface of the stator core do not come into contact with each other with appropriate dimensions between them. A gap is necessary. This gap is the finishing accuracy of the outer peripheral surface of the rotor core, the finishing accuracy of the inner peripheral surface of the stator core, the accuracy of matching between the rotor shaft center including the frame, bearing bracket and bearing, and the stator shaft center, It is necessary to set in consideration of vibration during operation, radial deformation of the rotor, and the like. Alternatively, when a jig is inserted into the gap during maintenance / inspection, it is necessary to consider the thickness of the jig, workability, and the like.

  Since the magnetic resistance in the air gap is larger than the magnetic resistance in the rotor core and the stator core, the performance is improved as the size of the air gap is smaller from the viewpoint of magnetic flux generation.

  As described above, from the viewpoint of electromagnetic performance, the smaller the air gap, the better the performance. On the other hand, from the mechanical viewpoint, it is necessary to secure the necessary air gap dimensions. Therefore, it is desirable that the size of the air gap be as small as possible while ensuring the necessary value. In addition, the size of the air gap is deeply related to the electromagnetic performance.

  Thus, since the dimension of the air gap is an important value, high accuracy is required for measuring the air gap.

JP 2012-244872 A

  Stator slots are formed on the inner peripheral surface of the stator core so as to penetrate in the axial direction at intervals in the circumferential direction. On the opening side of the stator slot, a wedge serving as a cover for holding the stator winding conductor in the stator slot is provided. The wedge opening surface, the stator teeth surface, Are generally not on the same circumference, but the surface on the opening side of the wedge is slightly retracted to the inside of the slot (see Patent Document 1).

  The measurement of the dimension of the air gap is performed using a gap gauge, for example, between the rotor teeth and the stator teeth. At this time, if a gap gauge is applied to the wedge of the stator slot instead of the stator teeth on the stator side, an incorrect dimension is measured.

  Since the inner peripheral surface of the stator core has a curvature, if the gap gauge width (the length in the circumferential direction of the gap) is increased so that the gap gauge does not hit the wedge portion of the stator slot, It causes a measurement error. Therefore, it is necessary to use a gap gauge having a small width, but it is necessary to confirm the position in the measurement, and the gap measurement requires a lot of trouble.

  Then, an object of this invention is to make easy the measurement of the air gap between the rotor of a rotary electric machine, and a stator.

In order to achieve the above object, a rotating electrical machine according to the present invention includes a rotor shaft that extends in the direction of the rotation axis and is rotatably supported, and a rotor iron core that is provided radially outside the rotor shaft. And a plurality of stator teeth formed by a plurality of slots provided on the outer side in the radial direction of the rotor core and extending along the inner peripheral surface thereof in the circumferential direction with a space therebetween. A stator having a cylindrical stator core having a stator winding including a stator winding conductor penetrating through the slot in the direction of the rotation axis, and the rotor core and the stator. A frame for housing, and two bearings for rotatably supporting the rotor shaft, wherein the stator winding conductor is disposed so as to close each opening of the plurality of slots, and the rotation axis direction Is held by winding conductor pressing wedge extending, only the surface of the opening side of the winding conductor pressing wedge in the axial direction end portion, characterized in that it overhangs the opening side.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to make easy the measurement of the air gap between the rotor and stator of a rotary electric machine.

It is an elevation sectional view showing the composition of the rotary electric machine concerning a 1st embodiment. It is a cross-sectional view which shows the part of the circumferential direction 1/4 of the rotor core and stator core which concern on 1st Embodiment. It is a cross-sectional view showing the details around the stator slot of the stator core according to the first embodiment. It is a cross-sectional view showing a winding conductor pressing wedge used in the stator slot of the stator core according to the first embodiment. It is a side view which shows the winding conductor pressing wedge used for the stator slot of the stator core which concerns on 1st Embodiment. It is a side view which shows the winding conductor holding | wedge wedge used for the stator slot of the stator core which concerns on 2nd Embodiment.

[First Embodiment]
Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  FIG. 1 is an elevational sectional view showing the configuration of the rotating electrical machine according to the first embodiment.

  The rotating electrical machine 100 includes a rotor 10, a stator 20, a bearing 30, a frame 40, and a bearing bracket 45.

  The rotor 10 includes a rotor shaft 11 extending in the horizontal direction, and a rotor core 12 that is provided on the radially outer side of the rotor shaft 11 and rotates together with the rotor shaft 11. The rotor shaft 11 is rotatably supported by bearings 30 on both sides of the rotor core 12.

  The stator 20 includes a cylindrical stator core 21 that is provided with an air gap 50 on the radially outer side of the rotor core 12, and a stator winding 25 that passes through the stator core 21.

  A frame 40 is provided on the radially outer side of the rotor core 12 and the stator 20. The frame 40 is open at both ends in the axial direction, and both ends are closed by bearing brackets 45. Each of the bearing brackets 45 supports the bearing 30.

  FIG. 2 is a cross-sectional view showing a quarter portion in the circumferential direction of the rotor core and the stator core. A plurality of rotor slots 13 penetrating in the axial direction are formed on the outer periphery of the rotor core 12 at intervals in the circumferential direction. A narrow rotor slot opening 13 a is formed on the outer peripheral side of each rotor core 12 of the rotor slot 13. Rotor teeth 14 are formed between the rotor slots 13 adjacent to each other. In FIG. 2, illustration of a conductor bar provided in the rotor slot 13 is omitted.

  A plurality of stator slots 23 are formed along the inner periphery of the stator core 21. The stator slots 23 are spaced apart from each other in the circumferential direction, and extend to both ends of the stator core 21 in the axial direction. Stator teeth 22 are formed between stator slots 23 adjacent to each other. 2, illustration of the stator winding conductor 25a (FIG. 3) provided in the stator slot 23 is omitted. The shape of the stator slot 23 will be described with reference to FIG.

  An air gap 50 is formed between the first cylinder including the outer peripheral surface of the rotor teeth 14 and the second cylinder including the inner peripheral surface of the stator teeth 22, and the distance in the radial direction is the width of the air gap 50. g.

  FIG. 3 is a cross-sectional view showing details around the stator slot of the stator core.

  The stator slot 23 is formed with a recess 23 a and a protrusion 23 b in the vicinity of the opening 28. The hollow portion 23a extends on both sides in the circumferential direction. The protruding portion 23b is a portion on the opening 28 side of the recessed portion 23a and having a narrow spread in the circumferential direction. The radial depth of the protrusion 23b is d1.

  A winding conductor holding wedge 24 is fitted in the recess 23a and the protrusion 23b.

  FIG. 4 is a cross-sectional view showing a winding conductor pressing wedge used in a stator slot of the stator core. FIG. 5 is a side view showing the winding conductor pressing wedge.

  As shown in FIG. 4, the cross section of the winding conductor holding wedge 24 has a shape including a cross section of a rectangular fitting portion 24a and a cross section of a rectangular receding compensation portion 24b extending along the longitudinal direction of the cross section of the fitting portion 24a. The circumferential width L2 of the backward compensation portion 24b corresponds to the circumferential width of the opening 28 of the stator slot 23 and is smaller than the circumferential width L1 of the fitting portion 24a. In other words, the thickness in the vicinity of both ends in the longitudinal direction is small.

  The winding conductor retainer wedge 24 is divided into a plurality of pieces in the axial direction to facilitate removal of the winding conductor retainer wedge 24 from the stator slot 23 and incorporation into the stator slot 23.

  The circumferential width of the backward compensation portion 24b corresponds to the width of the opening 28 and is smaller than the circumferential width of the fitting portion 24a. The backward compensation part 24b is adjacent to the fitting part 24a.

  The backward compensation unit 24b projects a space surrounded by the projection 23b toward the opening 28 with a thickness of d2. The thickness d2 of the backward compensation part 24b is formed to be equal to the depth d1 (FIG. 3) of the protrusion 23b.

  As a result, the inner surface of the winding conductor pressing wedge 24, that is, the surface on the opening 28 side of the backward compensation portion 24b is adjacent to the inner surface of the stator tooth 22 without a step.

  According to the present embodiment formed as described above, when measuring the dimension g (FIG. 2) of the air gap 50, a jig for measuring the air gap 50 is strictly applied to the inner surface of the stator tooth 22. Therefore, it is possible to easily measure the air gap between the rotor and the stator of the rotating electric machine without the need for preparation.

[Second Embodiment]
The present embodiment is a modification of the first embodiment, and only the winding conductor pressing wedge portion is different, and the others are the same as the first embodiment.

  FIG. 6 is a side view showing a winding conductor pressing wedge used in the stator slot of the stator core according to the second embodiment. In the winding conductor pressing wedge 24 in the second embodiment, the backward compensation portions 24 c are provided only at both axial ends of the stator slot 23. Actually, the measurement of the dimension g of the air gap 50 is performed in a state where the rotor 10 is positioned inside the stator core 21. Therefore, the measurement of the dimension g of the air gap 50 is performed at both ends of the stator core 21 in the axial direction.

  Accordingly, it is sufficient that the backward compensation portion 24 c of the winding conductor holding wedge 24 is provided at the end portion of the stator core 21. By doing so, the same effect as in the first embodiment can be obtained in the measurement of the dimension g of the air gap 50. Further, except for both ends, the winding conductor pressing wedge 24 does not have the backward compensation portion 24c and has a rectangular cross section, so that insertion into and removal from each stator slot 23 is even easier. It becomes.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. For example, in the embodiment, the case of a horizontal rotating electric machine in which the rotor shaft 11 extends in the horizontal direction has been described as an example. However, a vertical rotating electric machine may be used.

  Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention.

  The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 13 ... Rotor slot, 13a ... Rotor slot opening, 14 ... Rotor teeth, 20 ... Stator, 21 ... Stator iron core, 22 ... Stator Teeth, 23 ... Stator slot, 23a ... Depression, 23b ... Projection, 24 ... Winding conductor pressing wedge, 24a ... Insertion part, 24b, 24c ... Retraction compensation part, 25 ... Stator winding, 25a ... Stator Winding conductor, 28 ... opening, 30 ... bearing, 40 ... frame, 45 ... bearing bracket, 50 ... air gap, 100 ... rotating electric machine

Claims (3)

A rotor having a rotor shaft that extends in the direction of the rotation axis and is rotatably supported; and a rotor core that is provided radially outside the rotor shaft;
A plurality of stator teeth formed by a plurality of stator slots provided on the outer side in the radial direction of the rotor core and extending along the inner circumferential surface thereof in the circumferential direction with a space therebetween. A stator having a cylindrical stator core, and a stator winding including a stator winding conductor penetrating through the stator slot in the direction of the rotation axis;
A frame for housing the rotor core and the stator;
Two bearings rotatably supporting the rotor shaft;
With
The stator winding conductor is held by a winding conductor pressing wedge that is arranged so as to close each opening of the plurality of stator slots and extends in the rotation axis direction ,
The rotating electrical machine characterized in that the opening-side surface of the winding conductor pressing wedge extends only to the opening side only at the end portion in the axial direction.   The surface on the opening side of the winding conductor pressing wedge at least in the axial direction end is adjacent to the inner surface of the stator tooth adjacent to both sides in the circumferential direction without any step. The rotating electrical machine described.   3. The rotating electrical machine according to claim 1, wherein a thickness of the cross section of the winding conductor pressing wedge at least in the axial direction end portion is small in the vicinity of both ends in the longitudinal direction.

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