JP2018148605A - Rotary electric machine, slot insulation paper, manufacturing method of stator of rotary electric machine, and manufacturing method of slot insulation paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain improvement of insulation quality by stabilizing an insertion position of a slot insulation paper into a slot.SOLUTION: A slot insulation paper 9 includes: a pair of circumferential insulation parts 92 facing each other; and a radial insulation part 93. The radial insulation part 93 connects the pair of circumferential insulation parts 92 on a bottom of a slot 36. In a radial slot accommodation part 93a of the radial insulation part 93 that is a portion to be inserted into the slot 36, multiple projections 93a1 protruding in a thickness direction of the radial insulation part 93 are provided.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotating electrical machine in which a stator winding is inserted into a slot of a stator core via a slot insulating paper, a method of manufacturing the stator, a slot insulating paper inserted into a slot of the core, and a method of manufacturing the same. It is about.

  In a conventional stator of a rotating electric machine, a plurality of slots are provided in the stator core. A stator winding is inserted in each slot. Insulating paper is interposed between each stator winding and the stator core. The insulating paper has a pair of teeth side insulating sheet portions and a yoke side insulating sheet portion (see, for example, Patent Document 1).

JP, 2015-109738, A

  In the conventional rotating electrical machine as described above, the frictional force between one teeth-side insulating sheet and the stator core and the frictional force between the other teeth-side insulating sheet and the stator core are slight. Due to the difference, the insulating paper may rotate in the slot when the insulating paper is inserted into the slot. For this reason, variation occurs in the radial position of both ends of the insulating paper after insertion, and the insulation quality is degraded.

  The present invention has been made to solve the above-described problems. The rotating electrical machine, the slot insulating paper, which can stabilize the insertion position of the slot insulating paper into the slot and can improve the insulation quality, It is an object of the present invention to obtain a method for manufacturing a stator of a rotating electric machine and a method for manufacturing slot insulating paper.

  A rotating electrical machine according to the present invention is interposed between a stator core provided with a slot, a stator winding provided in the slot, and the stator core and the stator winding in the slot. The slot insulating paper includes a pair of circumferential insulating portions in contact with both end faces of the stator winding in the circumferential direction of the stator core, and a pair of peripherals at the bottom of the slot. And a radial insulating portion connecting the directional insulating portions, and the radial insulating portion is provided with a protruding portion protruding in the thickness direction of the radial insulating portion.

  In the rotating electrical machine according to the present invention, since the protruding portion protruding in the thickness direction of the radial insulating portion is provided in the radial insulating portion, the friction which the left and right circumferential insulating portions receive when the slot insulating paper is inserted into the slot. Even if there is a difference in force, the slot insulating paper is not easily displaced, and the insertion position of the slot insulating paper into the slot can be stabilized and the insulation quality can be improved.

It is sectional drawing which shows typically the rotary electric machine 100 by Embodiment 1 of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which expands and shows a part of stator iron core of FIG. It is sectional drawing which expands and shows a part of stator of FIG. It is sectional drawing which follows the VV line of FIG. It is a perspective view which shows the slot insulation paper of FIG. It is the front view which looked at the slot insulation paper of FIG. 6 along arrow VII. It is sectional drawing which follows the VIII-VIII line of FIG. It is sectional drawing which shows the 1st modification of the cross-sectional shape of the radial direction slot accommodating part of FIG. It is sectional drawing which shows the 2nd modification of the cross-sectional shape of the radial direction slot accommodating part of FIG. It is sectional drawing which shows the 3rd modification of the cross-sectional shape of the radial direction slot accommodating part of FIG. FIG. 5 is a cross-sectional view schematically showing a state during insertion of the slot insulating paper of FIG. 4 into the slot. It is sectional drawing which shows typically the state which inserted the slot insulating paper of FIG. 12 further in the slot. It is sectional drawing which shows typically the state which inserted the stator coil | winding in the slot of FIG. FIG. 5 is a cross-sectional view showing a state immediately before insertion of the stator winding of FIG. 4 into a slot. It is sectional drawing which shows the comparative example in the case of inserting slot insulation paper without a projection part in a slot. FIG. 17 is a cross-sectional view showing a state where the slot insulating paper of FIG. 16 is further inserted into the slot. It is principal part sectional drawing of the rotary electric machine by Embodiment 2 of this invention. FIG. 19 is a cross-sectional view showing a state immediately before insertion of the stator winding and slot insulating paper of FIG. 18 into a slot. FIG. 20 is a cross-sectional view showing a state after the stator winding and the slot insulating paper of FIG. 19 are inserted into the slots. FIG. 19 is a cross-sectional view schematically showing a state immediately before insertion of the stator winding and the slot insulating paper in FIG. 18 into the slot. It is sectional drawing which shows typically the state which inserted the stator winding | coil of FIG. 21, and slot insulation paper in the slot. FIG. 23 is a cross-sectional view schematically showing a state where the stator winding and the slot insulating paper of FIG. 22 are further pushed into the slot. It is principal part sectional drawing of the rotary electric machine by Embodiment 3 of this invention. It is a perspective view which shows the 1st modification of the shape of a projection part. It is a perspective view which shows the 2nd modification of the shape of a projection part.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the embodiment, unless otherwise specified, the axial direction, the circumferential direction, the radial direction, the inner circumferential side, the outer circumferential side, the inner side, and the outer side are all referred to as the axial direction, circumferential direction, and diameter of the stator. It means direction, inner circumference side, outer circumference side, inner side, outer side.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing a rotary electric machine 100 according to Embodiment 1 of the present invention, and shows a cross section along the center of rotation. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and shows a cross section orthogonal to the rotation center.

  In the figure, the rotating electrical machine 100 is a brushless motor having three or more phases. The rotating electrical machine 100 includes a frame 2, a stator 3, a rotor 4, a rotating shaft 5, a bearing holder 6, a first bearing 7, and a second bearing 8.

  In the rotating electrical machine 100, the output end 5a side of the rotating shaft 5 is referred to as a front side, and the opposite side is referred to as a rear side.

<Rotor>
The rotor 4 is a field of the rotating electrical machine 100. The rotor 4 has a substantially cylindrical rotor core 40 and a plurality of permanent magnets 41. The rotor core 40 is made of a ferromagnetic material such as iron. The permanent magnet 41 is affixed to the outer peripheral surface of the rotor core 40. A rotating shaft 5 is fixed to the center of the rotor core 40.

  The bearing holder 6 is fixed to the front side end of the frame 2. The first bearing 7 is held by the bearing holder 6. The second bearing 8 is held at the rear side end of the frame 2. The rotating shaft 5 is rotatably held by the first and second bearings 7 and 8.

<Stator>
The stator 3 is an armature of the rotating electric machine 100. Further, the stator 3 is arranged on the outer peripheral side of the rotor 4 via a certain gap. Further, the stator 3 has a stator core 30 and a plurality of stator windings 35.

  The stator core 30 is fixed to the inner peripheral surface of the frame 2. The stator core 30 is configured by laminating a plurality of thin plates in the axial direction of the rotating electrical machine. A steel plate or an electromagnetic steel plate is used as the thin plate. A thin insulating film is provided on the surface of the thin plate.

  Furthermore, the stator core 30 has an annular outer peripheral side core 30a which is a back yoke portion, and an inner peripheral side core 30b provided on the radially inner side of the outer peripheral side core 30a. The inner peripheral side iron core 30b has a plurality of teeth 31 arranged radially. Teeth 31 adjacent to each other in the circumferential direction of the stator 3 are connected to each other at a distal end portion on the radially inner side of the stator 3.

  Slots 36 are provided between the teeth 31 adjacent to each other in the circumferential direction of the stator 3. Each stator winding 35 is disposed in a slot 36. The outer peripheral side core 30a is press-fitted into the outer peripheral side of the inner peripheral side core 30b incorporating the stator winding 35, and the stator 3 is configured.

  In the rotating electrical machine 100, by using an inverter circuit (not shown), the current supplied to the stator winding 35 of each phase is switched in accordance with the phase of the rotor 4, so that the rotational speed and torque of the rotor 4 are changed. It is controlled to a desired value. Therefore, a rotation angle sensor (not shown) for detecting the phase of the rotor 4 is provided at the rear end of the rotating shaft 5.

<Tee tip shape>
FIG. 3 is an enlarged cross-sectional view showing a part of the stator core 30 of FIG. 2, and shows a state where the stator winding 35 is removed. The same number of notches 37 as the teeth 31 are provided in the inner peripheral portion of the outer peripheral side iron core 30a. The cross-sectional shape of each notch 37 is a V-shape that spreads inward in the radial direction of the stator core 30.

  Triangular portions 38 that fit into the notches 37 are provided at the ends of the teeth 31 on the radially outer side of the stator core 30. When the outer peripheral side core 30a is press-fitted into the inner peripheral side core 30b, the notch 37 and the triangular portion 38 are fitted. At that time, since the fitting surface is composed of two inclined surfaces, positioning in the circumferential direction, that is, the rotational direction is easy. Further, since the displacement for the press-fitting allowance escapes radially inward or radially outward of the stator core 30, the force required for press-fitting does not become excessively high.

<Coil shape>
FIG. 4 is an enlarged sectional view showing a part of the stator 3 of FIG. The cross-sectional shape of each slot 36 is a rectangle. In order to increase the space factor of the slot insertion portion 51, which is the portion inserted in the slot 36 of the stator winding 35, coil conductors 51a, 51b, 51c, 51d having a rectangular cross section are used.

  The surfaces of the coil conductors 51a, 51b, 51c, 51d are covered with an insulating film made of resin. However, since the mechanical strength of the insulating coating is not high, the insulating coating alone is not sufficient to guarantee the insulation between the stator core 30 and the stator winding 35.

  For this reason, the slot insulating paper 9 and the outer peripheral insulator 91 are disposed between the slot insertion portion 51 and the stator core 30. Thereby, sufficient withstand voltage is ensured against vibration and temperature change applied to the rotating electrical machine 100.

  In the cross section of each slot 36 perpendicular to the axial direction of the stator 3, the sum of both side surfaces of the circumferential slot insertion portion 51 of the stator core 30 and the end surface of the slot insertion portion 51 radially inside the stator 3. Three sides are covered with one slot insulating paper 9. Further, the end face of the slot insertion portion 51 on the radially outer side of the stator core 30 is covered with an outer peripheral insulator 91.

<Slot insulation paper shape>
The slot insulating paper 9 of the present embodiment is composed of a sheet having a three-layer structure in which a resin film is sandwiched between two nonwoven fabrics. Moreover, the thickness dimension of the slot insulating paper 9 of this Embodiment is 0.15 mm. However, the material and thickness dimension of the slot insulating paper 9 are not limited to this.

  Each slot insulating paper 9 is formed by bending a rectangular sheet as described above into a U-shape. Accordingly, each slot insulating paper 9 has a pair of circumferential insulating portions 92 and a radial insulating portion 93 that face each other.

  The circumferential insulating portion 92 is in contact with both end faces of the stator winding 35 in the circumferential direction of the stator core 30. That is, the circumferential insulating portion 92 insulates the side surfaces of the teeth 31 on both sides of the slot insertion portion 51 from the both side surfaces of the slot insertion portion 51.

  The radial insulating portion 93 connects the pair of circumferential insulating portions 92 at the bottom of the slot 36. That is, the radial insulating portion 93 insulates between the end surface of the slot insertion portion 51 on the radially inner side of the stator core 30 and the bottom surface of the slot 36.

  5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. 6 is a perspective view showing the slot insulating paper 9 in FIG. The slot insulating paper 9 is positioned within the axial range of the stator core 30 and accommodated in the slot 36, and a pair of slot protrusions 9b protruding from both axial ends of the stator core 30. And have.

  The broken line in FIG. 6 indicates the position of the axial end portion of the stator core 30. In FIG. 6, the slot accommodating portion 9a of the circumferential insulating portion 92 is referred to as a circumferential slot accommodating portion 92a, and the slot protruding portion 9b of the circumferential insulating portion 92 is referred to as a circumferential slot protruding portion 92b. Further, the slot accommodating portion 9a of the radial insulating portion 93 is referred to as a radial slot accommodating portion 93a, and the slot protruding portion 9b of the radial insulating portion 93 is referred to as a radial slot protruding portion 93b.

  The radial slot accommodating portion 93 a is provided with a plurality of protrusions 93 a 1 that protrude in the thickness direction of the radial insulating portion 93. The radial slot protrusion 93b is not provided with a protrusion 93a1.

  As shown in FIG. 4, the protrusion 93 a 1 is formed so that the slot insulating paper 9 and the slot insertion portion 51 of the stator winding 35 are completely inserted into the slot 36 and the bottom of the slot 36 and the slot insertion portion 51. It is crushed between. In addition, each protrusion 93 a 1 has a mountain shape in which the ridge line is parallel to the axial end surface of the stator core 30 in the middle of insertion into the slot 36.

  Furthermore, the shape of the radial insulation part 93 is a rectangle, and all the protrusions 93a1 are arranged at intervals in a direction parallel to the long side of the radial insulation part 93. Furthermore, the ridgeline of each protrusion 93 a 1 is parallel to the short side of the radial insulating portion 93.

  7 is a front view of the slot insulating paper 9 of FIG. 6 as viewed along the arrow VII, and FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. The cross-sectional shape of the radial direction slot accommodating part 93a is a waveform. Thereby, the protrusions 93a1 protrude alternately on the stator winding 35 side and the bottom surface side of the slot 36.

  The protruding portion 93a1 protruding toward the bottom surface side of the slot 36 forms a convex portion 93a1a when the radial insulating portion 93 is viewed from the side opposite to the circumferential insulating portion 92. The protruding portion 93a1 protruding toward the stator winding 35 forms a concave portion 93a1b when the radial insulating portion 93 is viewed from the side opposite to the circumferential insulating portion 92.

  By providing the protrusion 93a1, the thickness dimension T2 of the radial slot accommodating part 93a is larger than the thickness dimension T1 of the radial slot protrusion 93b and the circumferential insulating part 92 (T2>). T1).

  In addition, the cross-sectional shape of the radial direction slot accommodating part 93a is not restricted to a waveform, For example, a shape as shown to FIGS. In FIG. 9, the cross section of each protrusion 93a1 is a triangle. In FIG. 10, all the protrusions 93a1 are convex portions 93a1a. In FIG. 11, all the protrusions 93a1 are recesses 93a1b. Each protrusion 93a1 has a shape parallel to the end face of the stator core 30 as shown in FIG.

  Moreover, you may form combining the projection part 93a1 of two or more types of cross-sectional shapes in one radial direction slot accommodating part 93a.

<How to insert slot insulation paper>
Next, a method for inserting the slot insulating paper 9 into the slot 36 will be described. When inserting the slot insulating paper 9 into the slot 36, first, the slot insulating paper 9 is disposed at the entrance of the slot 36. Then, as shown in FIG. 12, the radial insulating portion 93 of the slot insulating paper 9 is pushed in the inner circumferential direction with a plate-like insertion jig 94. Thereby, as shown in FIG. 13, the slot insulating paper 9 is inserted into the slot 36.

  After the slot insulating paper 9 is inserted, the slot insertion portion 51 of the stator winding 35 is inserted into the slot 36 as shown in FIG. The protrusion 93a1 is crushed by being pressed against the bottom of the slot 36 by the insertion jig 94 when the slot insulating paper 9 is inserted or by the slot insertion part 51 when the stator winding 35 is inserted.

<Method of inserting the stator winding>
Next, a method for inserting the stator winding 35 into the slot 36 will be described. When the stator winding 35 is inserted into the slot 36, as shown in FIG. 15, the position of the stator winding 35 in the circumferential direction of the inner peripheral iron core 30b is restricted to the outer peripheral portion of the inner peripheral iron core 30b. A plurality of regulating jigs 53 are attached. At this time, the regulating jig 53 is fitted to the tip of the tooth 31.

  Thereafter, the stator winding 35 is set between the adjacent restriction jigs 53. Then, the stator winding 35 set between the regulating jigs 53 is pushed into the slot 36 from the outer peripheral side.

  After the stator winding 35 is pushed into the slot 36, the outer peripheral insulator 91 is inserted from the outer periphery. And as shown in FIG. 4, the outer peripheral side iron core 30a is press-fit in the outer periphery of the inner peripheral side iron core 30b. As a method of attaching the outer peripheral insulator 91, there are a method of inserting from the outer periphery and adhering to the back surface of the stator winding 35, a method of adhering in advance to the outer periphery of the slot of the outer peripheral iron core 30a, and the like.

  After the outer peripheral side iron core 30a is press-fitted, the terminal wire of each stator winding 35 is connected and the stator 3 is completed.

<Manufacturing method of slot insulation paper>
When the slot insulating paper 9 is manufactured, a rectangular sheet is bent to form a pair of circumferential insulating portions 92 facing each other and a radial insulating portion 93 connecting the ends of the circumferential insulating portions 92. To do. And the protrusion part 93a1 is formed in the radial direction slot accommodating part 93a by pressing the radial direction insulation part 93 with a metal mold | die.

  Moreover, after forming the projection part 93a1 by pressing the part which becomes the radial direction slot accommodating part 93a of the sheet | seat before a process with a metal mold | die, it is bent and the circumferential direction insulation part 92 and the radial direction insulation part 93 are given. And may be formed.

  In such a rotating electrical machine, since the projection 93a1 is provided in the radial slot accommodating portion 93a of the slot insulating paper 9, the thickness dimension T2 of the radial slot accommodating portion 93a is larger than the thickness dimension T1 of other portions. Is also getting bigger. Therefore, even when a difference in frictional force is applied to the left and right circumferential insulating portions 92 when the slot insulating paper 9 is inserted into the slot 36, the teeth 31 and the insertion jig that are in contact with one circumferential insulating portion 92 are in contact with each other. The radial insulating portion 93 is not pulled into the space 94.

  Thereby, rotation of the slot insulating paper 9 in the slot 36 is prevented, and the radial end portions 921L of the left and right circumferential insulating portions 92 after the slot insulating paper 9 is inserted into the slot 36 as shown in FIG. , 921R is eliminated in the radial position. Therefore, deterioration of insulation quality can be prevented.

  On the other hand, FIGS. 16 and 17 show a comparative example in which the slot insulating paper 9 not provided with the protrusion 93a1 is inserted into the slot 36. FIG. In FIG. 16, since the insertion jig 94 is biased to the left side, the frictional force received by the left circumferential insulating portion 92 from the left tooth 31 is greater than the frictional force received by the right circumferential insulating portion 92 from the right tooth 31. Is also getting bigger.

  For this reason, a force is applied to the slot insulating paper 9 to rotate it in the direction of arrow C within the slot 36. At this time, when the thickness dimension of the radial slot storage portion 93a is the same as that of other portions, the radial slot storage portion 93a may be pulled between the left tooth 31 and the insertion jig 94.

  Then, as shown in FIG. 17, the radial positions of the radial end portions 921L and 921R of the left and right circumferential insulating portions 92 after insertion of the slot insulating paper 9 into the slot 36 are displaced. Thereby, the area | region where the slot insulating paper 9 is not arrange | positioned on the side surface of the teeth 31 arises, and insulation quality deteriorates.

  Such a difference between the left and right frictional forces is also caused by a difference in surface roughness between the left and right teeth 31.

  In the slot insulating paper 9 according to the present embodiment, the radial slot accommodating portion 93a is provided with the projections 93a1, so that even if a force for rotating the slot insulating paper 9 is generated, the radial slot accommodating portion 93a. Since the thickness dimension is larger than the thickness dimension of other portions, the slot insulating paper 9 is prevented from being displaced. Accordingly, it is possible to stabilize the insertion position of the slot insulating paper 9 into the slot 36 and improve the insulation quality.

  Further, since the protrusion 93a1 is formed by pressing with a mold, it is not necessary to add another part, and an increase in manufacturing cost can be suppressed.

  Furthermore, since the thickness dimension of the radial direction slot accommodating part 93a can be finally made small by crushing the protrusion part 93a1, the fall of the space factor of the stator coil | winding 35 can be prevented.

  Furthermore, since the protrusion 93a1 has a mountain shape whose ridge line is parallel to the axial end surface of the stator core 30, the slot insulating paper 9 can be more reliably prevented from shifting.

  Further, since the plurality of protrusions 93a1 are arranged at intervals from each other in the direction parallel to the long side of the radial insulating portion 93, the displacement of the slot insulating paper 9 can be prevented more reliably.

Embodiment 2. FIG.
Next, FIG. 18 is a cross-sectional view of a main part of a rotating electrical machine according to Embodiment 2 of the present invention.
<Slot insulation paper shape>
The slot insulating paper 9 according to the second embodiment further includes an opening insulating portion 95 in addition to the pair of circumferential insulating portions 92 and the radial insulating portion 93. The opening insulating portion 95 protrudes from the end of the one circumferential insulating portion 92 opposite to the radial insulating portion 93 toward the other circumferential insulating portion 92.

  The slot insertion portion 51 of the stator winding 35 is covered on the four surfaces, that is, the entire circumference, by the slot insulating paper 9 when a cross section perpendicular to the axis of the stator core 30 is viewed. Other configurations are the same as those of the first embodiment, and the radial insulating portion 93 is provided with a protrusion 93a1.

  In FIG. 18, the opening insulating portion 95 protrudes from the left circumferential insulating portion 92 toward the right circumferential insulating portion 92, but from the right circumferential insulating portion 92 to the left circumferential insulating portion 92. The opening insulating portion 95 may be protruded from both circumferential insulating portions 92.

<Method of inserting the stator winding 35>
Next, a method for inserting the stator winding 35 into the slot 36 will be described. When the stator winding 35 is inserted into the slot 36, as shown in FIG. 19, the position of the stator winding 35 in the circumferential direction of the inner peripheral iron core 30b is restricted to the outer peripheral portion of the inner peripheral iron core 30b. A plurality of regulating jigs 53 are attached. At this time, the regulating jig 53 is fitted to the tip of the tooth 31.

  Thereafter, the stator winding 35 is set between the adjacent restriction jigs 53. The slot insulating paper 9 is wound around the slot insertion portion 51 of the stator winding 35 in advance. Then, as shown in FIG. 20, the stator winding 35 set between the regulating jigs 53 is pushed together with the slot insulating paper 9 from the outer peripheral side toward the slot 36.

  As described above, even when the opening insulating portion 95 is provided in the slot insulating paper 9, the same effect as that of the first embodiment can be obtained by providing the protruding portion 93a1 in the radial slot accommodating portion 93a.

  As shown in FIG. 21, the stator winding 35 before being inserted into the slot 36 is restricted by the restricting jig 53 from being shifted in the circumferential direction to be larger than the slot width. However, as shown in FIG. 22, in the slot 36, the coil conductors 51a to 51d vary in the circumferential direction within the range of the slot width.

  And the difference of the frictional force which the left-right circumferential insulating part 92 receives arises by the dispersion | variation in the circumferential direction position of the coil conductors 51a-51d. However, since the projection 93 a 1 is provided in the radial slot accommodating portion 93 a of the slot insulating paper 9, the slot insulating paper 9 does not rotate in the slot 36.

  Accordingly, the positional deviation between the end portion 951 of the opening insulating portion 95 after the slot insulating paper 9 is inserted into the slot 36 and the radial end portion 921R of the circumferential insulating portion 92 on which the opening insulating portion 95 is not provided. Disappears. Thereby, deterioration of insulation quality can be prevented.

  Further, as shown in FIG. 23, by pushing the stator winding 35 into the slot 36 and crushing the protrusion 93a1, the thickness dimension of the radial slot accommodating portion 93a can be finally reduced, A decrease in the space factor of the sub-winding 35 can be prevented.

  Furthermore, since the opening insulating portion 95 is provided in the slot insulating paper 9, the outer peripheral insulator 91 can be omitted, and the number of parts and the number of assembly steps can be reduced.

Embodiment 3 FIG.
Next, FIG. 24 is a cross-sectional view of an essential part of a rotating electrical machine according to Embodiment 3 of the present invention. The stator core 30 is configured by laminating a plurality of thin plates 301. In this example, an electromagnetic steel plate is used as the thin plate 301. The protrusion 93a1 includes a plurality of protrusions 93a1a serving as misalignment prevention protrusions protruding toward the bottom surface of the slot 36.

  The convex portions 93a1a are arranged at an interval X that is a positive integer multiple of the thickness dimension of the thin plate 301. In this example, the arrangement pitch of the protrusions 93 a 1 a in the axial direction of the stator core 30 is twice the thickness dimension of the thin plate 301.

  Since the thin plate 301 is punched out by a die press, there is a sag in the cross section of the thin plate 301. For this reason, the inner surface of the slot 36 is not smooth, and a recess 302 is formed between the thin plates 301 on the inner surface of the slot 36. The convex portion 93 a 1 a is in the recess 302. Other configurations are the same as those in the first or second embodiment.

  In such a rotating electrical machine, in addition to the same effects as those of the first or second embodiment, an effect of preventing the slot insulating paper 9 from being displaced in the slot 36 can be obtained. That is, when the slot insulating paper 9 tries to shift in the axial direction of the stator core 30 in the slot 36, the convex portion 93a1a is caught in the recess 302, and the shift is prevented.

  Therefore, without increasing the manufacturing cost, the slot insulating paper 9 is not displaced in the axial direction in the process after the slot insulating paper 9 is inserted into the slot 36, and deterioration of the insulation quality can be prevented.

In addition, the recessed part 93a1b may be arrange | positioned between the convex parts 93a1a.
Further, the misalignment prevention protrusions are not necessarily arranged at equal intervals, and each interval may be a positive integer multiple of the thickness of the thin plate 301.

Further, in the first to third embodiments, the shape of the protrusion 93a1 is a mountain shape in which the ridge line is parallel to the axial end surface of the stator core 30, that is, parallel to the direction orthogonal to the axial direction of the stator core 30. However, the protrusion may have another shape. For example, a cylindrical protrusion 93a1 as shown in FIG. 25 or a square pillar-shaped protrusion 93a1 as shown in FIG. 26 may be used. In addition, the front shape of the protrusion may be an ellipse, an oval, a triangle, or a polygon having five or more corners.
Furthermore, the number of protrusions is not particularly limited.

In FIG. 3, four coil conductors 51a, 51b, 51c, 51d are arranged in each slot 36, but the number of coil conductors inserted in each slot 36 is not limited to this.
Further, in the above example, since the slot shape is rectangular, the coil conductor having a rectangular cross section is used. However, the cross sectional shape of the coil conductor is not limited to this. For example, if the slot shape is trapezoidal, the cross section of the coil conductor may be trapezoidal. In this case, the coil conductor having a trapezoidal cross section can be manufactured by plastically deforming a coil conductor having a general round cross section or a rectangular cross section.

Furthermore, in the above example, the surface magnet type rotor 4 in which the permanent magnet 41 is attached to the surface of the rotor core 40 is shown. However, a magnet embedding hole is provided in the rotor core, and the rotor A magnet-embedded rotor in which a magnet is embedded in an iron core may be used.
In the above example, the stator core 30 is divided into the outer peripheral side core 30a and the inner peripheral side core 30b, and the opening of the slot 36 is provided on the radially outer side of the inner peripheral side core 30b. The structure of the stator core is not limited to this. For example, a stator core of a type in which the opening of the slot is radially inward and the stator winding is inserted into the slot toward the radially outer side may be used.
Furthermore, the present invention can be applied to various types of rotating electrical machines using slot insulating paper.

  3 stator, 9 slot insulation paper, 30 stator core, 35 stator winding, 36 slot, 92 circumferential insulation part, 93 radial insulation part, 93a1 projection part, 93a1a projection part (position shift prevention projection part), 95 Opening insulating part, 100 rotating electric machine, 301 thin plate.

Claims (11)

A stator core provided with a slot, a stator winding provided in the slot, and a slot insulating paper interposed between the stator core and the stator winding in the slot; Comprising a stator having
The slot insulating paper is
A pair of circumferential insulating portions in contact with both end faces of the stator winding in the circumferential direction of the stator core;
A radial insulation portion connecting the pair of circumferential insulation portions at the bottom of the slot;
A rotating electrical machine in which the radial insulating portion is provided with a protruding portion protruding in a thickness direction of the radial insulating portion.   The rotating electrical machine according to claim 1, wherein the protrusion is crushed between a bottom of the slot and the stator winding.   3. The rotating electrical machine according to claim 1, wherein the protrusion has a mountain shape in which a ridge line is parallel to an axial end surface of the stator core.   The slot insulating paper further includes an opening insulating portion that protrudes from an end portion of the one circumferential insulating portion opposite to the radial insulating portion toward the other circumferential insulating portion. The rotating electrical machine according to any one of claims 1 to 3. The stator core is configured by laminating a plurality of thin plates,
The protrusion includes a plurality of misalignment prevention protrusions protruding toward the bottom side of the slot,
5. The rotating electrical machine according to claim 1, wherein the misalignment prevention protrusions are arranged at intervals of a positive integer multiple of a thickness dimension of the thin plate. Slot insulating paper interposed between the stator core and the stator winding in a slot of the stator core,
A pair of circumferential insulating portions facing each other;
A radial insulation part connecting between the ends of the pair of circumferential insulation parts,
Slot insulating paper in which the radial insulating portion is provided with a protruding portion protruding in the thickness direction of the radial insulating portion.   The slot insulating paper according to claim 6, further comprising an opening insulating portion projecting from one end of the circumferential insulating portion opposite to the radial insulating portion toward the other circumferential insulating portion. The shape of the radial insulating portion is a rectangle,
The slot insulating paper according to claim 6 or 7, wherein the two or more protrusions are spaced from each other in a direction parallel to a long side of the radial insulating portion.   A pair of circumferential insulating portions opposed to each other, and a radial insulating portion connecting between ends of the pair of circumferential insulating portions, and the radial insulating portion includes a thickness of the radial insulating portion. A slot insulating paper provided with a protruding portion protruding in the vertical direction is inserted into a slot of the stator core, and a stator winding is inserted into the slot, and the stator core and the stator winding are inserted. A method of manufacturing a stator of a rotating electrical machine interposed between wires.   The method of manufacturing a stator for a rotating electrical machine according to claim 9, wherein when the slot insulating paper is inserted into the slot, the radial insulating portion is pressed against a bottom portion of the slot to crush the protrusion.   By bending the sheet, a pair of circumferential insulating portions facing each other and a radial insulating portion connecting between ends of the pair of circumferential insulating portions are formed, and the radial insulating portion is formed as a mold. A method of manufacturing slot insulating paper, wherein a protruding portion protruding in the thickness direction of the radial insulating portion is formed in the radial insulating portion by pressing in step (1).

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