CN114389393A

CN114389393A - Rotating electrical machine

Info

Publication number: CN114389393A
Application number: CN202111114022.7A
Authority: CN
Inventors: 鲇川直彦; 日野辰郎; 江头康平; 长谷川和哉; 前川健二; 中野正嗣; 久保田健
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-10-06
Filing date: 2021-09-23
Publication date: 2022-04-22
Also published as: JP2022061067A; JP7065924B2

Abstract

A rotating electrical machine has: a first coil edge extending in a circumferential direction so that adjacent coil edge ends disposed on the radially outermost side of the plurality of slits are covered from the radially outer side; and a second coil edge connected to the first coil edge, wherein a radial displacement region and a diagonal region are axially provided at the first coil edge, the radial displacement region extends radially outward from the notch, the diagonal region extends circumferentially while being inclined axially toward a connection portion with the second coil edge, a radial bending portion and an axial bending portion are provided at the radial displacement region, the radial bending portion is bent radially outward from an outlet of the notch, the axial bending portion is bent axially and connected to the diagonal region, and a margin is secured between adjacent coil edges.

Description

Rotating electrical machine

Technical Field

The present application relates to a rotating electric machine.

Background

In recent years, in rotating electrical machines used as motors or generators, there is a demand for small-sized, high-output, and high-quality products. In order to miniaturize the rotating electric machine, it is effective to shorten the coil edge in the axial direction and the radial direction. In order to shorten the coil edge in the inner diameter direction, as shown in patent document 1, there is disclosed a configuration in which: the inner coil edge end and the outer coil edge end are connected without displacing the inner coil edge end radially inward by displacing the outer coil edge end radially outward and extending in the circumferential direction by a connecting portion between the radially inner coil edge end and the radially outer coil edge end.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2019/093515 (FIG. 20)

Disclosure of Invention

In the rotating electrical machine described in patent document 1, since the radially outer coil edge extending in the circumferential direction extends in the circumferential direction while being displaced radially outward, the amount of displacement in the radial direction is reduced, and the radial gap between the coil edge and the coil edge adjacent in the circumferential direction is reduced, and therefore, a sufficient margin for avoiding the crossover cannot be obtained. Therefore, a load is applied to the insulating coating film of the coil, which may cause coating damage and decrease the insulating performance of the coil.

An object of the present application is to obtain a rotating electric machine including the following structure in a coil edge end protruding from a slot: damage of the insulating coating film at the coil edge end due to interference with the adjacent coil edge end is prevented.

The rotating electrical machine of the present application has a stator in which wires wound in a plurality of slots of a stator core that is configured in a ring shape around a rotating shaft are insulated and coated to form a coil, the coil having: a first coil edge extending circumferentially so as to cover a radially outermost adjacent coil edge provided in the plurality of slots from the radially outer side; and a second coil edge connected to the first coil edge, wherein a radial displacement region and a diagonal region are axially provided at the first coil edge, the radial displacement region extends radially outward from the cut groove, the diagonal region extends circumferentially while being inclined in the axial direction toward a connection portion with the second coil edge, a radial bending portion and an axial bending portion are provided at the radial displacement region, the radial bending portion is bent radially outward from an exit of the cut groove, and the axial bending portion is bent axially and connected to the diagonal region.

The first coil edge has the following structure: including a radial bend portion that bends radially outward from the exit of the slot in the radial displacement region and an axial bend portion that bends in the axial direction before further entering the ramp region, the amount of radial displacement can be increased, thereby obtaining a margin for avoiding intersection with the coil edge end of the adjacent slot. Therefore, damage of the insulating coating film at the coil edge due to interference with the adjacent coil edge can be prevented.

Drawings

Fig. 1 is a sectional view showing a rotating electric machine according to embodiment 1.

Fig. 2 is a perspective view showing a stator of a rotating electric machine according to embodiment 1.

Fig. 3A is a perspective view showing a coil of the rotating electric machine according to embodiment 1.

Fig. 3B is a plan view showing a coil of the rotating electric machine according to embodiment 1.

Fig. 3C is a sectional view showing a coil of the rotating electric machine according to embodiment 1.

Fig. 4 is a schematic diagram showing a coil of a rotating electric machine according to embodiment 1.

Fig. 5 is a circuit diagram showing a coil of a rotating electric machine according to embodiment 1.

Fig. 6A is a perspective view showing a coil of a rotating electric machine according to embodiment 1.

Fig. 6B is a perspective view showing a coil of the rotating electric machine according to embodiment 1.

Fig. 7 is a perspective view showing a coil of a rotating electric machine according to embodiment 1.

Fig. 8 is a perspective view showing a coil of a rotating electric machine according to embodiment 1.

Fig. 9 is a perspective view showing a combination of a coil and a stator core of a rotating electric machine according to embodiment 1.

Fig. 10 is a schematic diagram showing a coil end of the rotating electric machine according to embodiment 1.

Fig. 11 is a sectional view showing a coil end of the rotating electric machine according to embodiment 1.

Fig. 12 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 2.

Fig. 13 is a sectional view showing a coil end of the rotating electric machine according to embodiment 2.

Fig. 14A is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 3.

Fig. 14B is a sectional view showing a coil end of the rotating electric machine according to embodiment 3.

Fig. 15 is a sectional view showing a coil end of a rotating electric machine according to embodiment 3.

Fig. 16 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 4.

Fig. 17 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 5.

Fig. 18 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 6.

Fig. 19 is a sectional view showing a coil end of a rotating electric machine according to embodiment 6.

Fig. 20 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 7.

Fig. 21 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 8.

Fig. 22 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 9.

Fig. 23 is a schematic diagram showing a coil end of a rotating electric machine according to embodiment 10.

(symbol description)

1, a shell; 2, a bracket; 3, a stator; 4, a bearing; 5, rotating a shaft; 6, a rotor; 7 a rotor core; 8a permanent magnet; 9 a stator core; 10 stator windings; 11 a rotating electrical machine; 12 coils; 12a, coil A; 12B, a coil B; a 21-pole tooth part; 22, cutting grooves; 23 cutting a groove part; a 24-corner portion; 25 outer peripheral side ends; 26 inner circumference side end; 51 a first beveled portion; 52 a second beveled portion; 53 third beveled portion; 81 a first coil side end; 82 second coil side end; 83 third coil side end; 90 radial shift regions; 91 diagonal area; 101 a radial bend; 102 an axial bend; 103 a circumferential bend; 104 an axial bend; 105 straight line regions; 106 a circumferential bend; 107 axial bends; 108 a connecting part; 200 fixed points; 201 a fixing member; 202 circumferential intersection points; 203 range; a 210 buckling point; 220 fixed point; 230 range.

Detailed Description

Embodiment mode 1

Fig. 1 is a sectional view of a rotating electric machine according to embodiment 1. In fig. 1, a rotating electrical machine 11 includes: a bottomed cylindrical case 1; a holder 2, the holder 2 sealing an opening of the case 1; a stator 3, the stator 3 being fixed to the housing 1 by fixing means such as shrink fitting or press fitting; a rotating shaft 5, the rotating shaft 5 being rotatably supported by the bottom of the housing 1 and the bracket 2 via a bearing 4; and a rotor 6, the rotor 6 being fixed to the rotating shaft and rotatably disposed on an inner peripheral side of the stator 3. The rotor 6 is a permanent magnet type rotor including a rotor core 7 and permanent magnets 8, the rotor core 7 is fixed to the rotating shaft 5 inserted through the rotor core at an axial position, and the permanent magnets 8 are embedded in the outer peripheral surface side of the rotor core 7 and arranged at predetermined intervals in the circumferential direction to constitute magnetic poles.

Next, the structure of the stator 3 will be specifically described with reference to fig. 2 to 11. In the following description, the rotation axis direction (vertical direction in fig. 1) is defined as an axial direction, the rotation axis center direction (horizontal direction in fig. 1) is defined as a radial direction, and the rotation direction about the rotation axis is defined as a circumferential direction. As shown in fig. 2, the stator 3 includes: a stator core 9, the stator core 9 being disposed around the rotating shaft 5 in a ring shape; a stator winding 10, the stator winding 10 being mounted on a slot of the stator core 9; and a coil 12, wherein the coil 12 constitutes the stator winding 10. The coil 12 is formed by winding an insulated wire. For convenience of description, the rotating electric machine 11 of the present application will be described by taking, as an example, a case where the magnetic poles are eight poles, the number of slots of the stator core 9 is forty-eight, the stator winding 10 is three-phase winding, and the slots are formed in the stator core 9 at a ratio of two per phase per pole.

The coil 12 shown in fig. 3A is a coil assembly in which two single coils that are adjacent in the circumferential direction and are wound in the same direction are connected. Fig. 3A is a perspective view showing the two single coils. Fig. 3B is a plan view of the single coil as viewed from above, and fig. 3C is a cross-section AA of the single coil. The structure of the single coil will be described with reference to the schematic diagrams of fig. 4A and 4B. As shown in fig. 4A, stator core 9 includes: a pole tooth portion 21, the pole tooth portion 21 extending radially inward; and a slit groove 22, the slit groove 22 being divided by the tooth portion 21 in the circumferential direction.

The coil 12 has: a slot portion 23(S1 to S8), the slot portion 23 being attached to the slot 22 of the stator core 9; the return portions 24(T1-2, T2-3, T3-4, T4-5, T5-6, T7-8) protrude from the slots 22 of the stator core 9 and span to circumferentially different slots; and an outer peripheral side end 25(T1A) and an inner peripheral side end 26(T8A), the outer peripheral side end 25(T1A) and the inner peripheral side end 26(T8A) being adapted to protrude in the axial direction from the slot 22 of the stator core 9 and to be connected to the other coil 12 of the stator winding 10. For example, when a current is supplied from the outer peripheral end 25, the current flows through the notch 23 and the coil edge, and is connected from the inner peripheral end 26 to the adjacent other coil 12. By causing a current to flow through the coil 12 in this way, a magnetic field can be generated.

Here, as shown in fig. 4A and 4B, one unit coil of the coils 12 spans six slit pitches in the circumferential direction through T1A and is connected to S1 to S4 by the bent portions 24 so as to be wound at equal intervals of the pole pitch. Another unit coil spans six slot pitches in the circumferential direction and is connected to S5 to S8 by the bent portion 24 so as to be wound up to T8A at equal intervals of pole pitch. S4, which is the winding end point of one unit coil, and S5, which is the winding start point of the other unit coil, are connected via T4-5, and are connected by the bent portion 24 so as to extend over five slit pitches in the circumferential direction. In this way, the coils 12 are connected between the slots 22 formed in the stator core 9 at a ratio of two per pole per phase. The outer peripheral side end 25 and the inner peripheral side end 26 join the coils 12 to each other. Alternatively, a power supply unit as a supply voltage is connected to the inverter.

Fig. 5 shows an example of a wiring diagram of the stator winding 10. U1 to U8 represent coils 12 constituting a U phase of three-phase alternating current, V1 to V8 represent coils 12 constituting a V phase, and W1 to W8 represent coils 12 constituting a W phase. From the inverter device to the neutral point, the coil groups of the U-phase, the V-phase, and the W-phase are connected in parallel and supplied with power. Thus, a three-phase winding is constructed. In the present embodiment, the example in which the coils 12 constituting the U-phase, V-phase, and W-phase are connected in series has been described, but the coils 12 in the same phase may be connected in parallel.

An example of the structure of the stator winding 10 will be described. Fig. 6A and 6B show a coil a12a and a coil B12B constituting the stator winding 10. Fig. 7 shows a structure in which the coil a12a is joined to the adjacent coil B12B. As shown in fig. 7, by joining the inner peripheral side terminal T8A of the coil a12a and the inner peripheral side terminal T8B of the one-side coil B12B, the outer peripheral side terminal T1A of the coil a12a and the outer peripheral side terminal T1B of the other coil B12B are joined to join the adjacent coils to each other.

In this way, the stator is configured by arranging 24 coils 12 in one circle as shown in fig. 8 and inserting the stator core 9 from the outer diameter side as shown in fig. 9. In the present embodiment, the stator core 9 is divided and inserted from the outer diameter side, but the coil may be inserted from the inner diameter side of the stator 3.

Fig. 10 is a schematic view showing a part of the coil edge end on the connection side disposed on the outermost side in the radial direction, as viewed from the radially outer side. Fig. 10 shows only the coil edge ends that protrude from seven notches that are continuous in the circumferential direction and are disposed on the outermost side in the radial direction. In fig. 10, the right direction is expressed as a circumferential direction forward direction, and the left direction is expressed as a circumferential direction reverse direction. Structurally, however, there is no forward or reverse direction in the circumferential direction. Fig. 11 is a cross-sectional view showing a cross-section BB in fig. 10. In fig. 11, the left side is the outer diameter direction as the radial outer side, and the right side is the inner diameter direction as the radial inner side. However, the expressions of the outer diameter and the inner diameter are based on the shapes of the stator core 9 and the slots 22 as viewed from the rotating shaft 5. The expression outermost coil edge means the coil edge located at the outermost side in the radial direction. In fig. 10, although the slots 22 are hidden by the stator core 9 and are not shown, it is assumed that each coil side end has a structure protruding in the axial direction from the outlet of the slot 22, which is the upper end in the axial direction of the stator core 9. The above description is also applicable to the drawings subsequent to fig. 10 and 11.

Only the first coil edge 81 and the third coil edge 83 are illustrated in fig. 11. The outer peripheral end 25 of the coil 12 is the outermost coil edge on the connection side in the radial direction. The first slope part 51 of the first coil side end 81 protruding from the notch 22 extends in the circumferential direction in the reverse direction, and the third slope part 53 of the third coil side end 83 protruding from the notch adjacent to the notch 22 in the circumferential direction in the reverse direction extends in the circumferential direction in the forward direction. The following structure is shown in this embodiment: for example, the first coil side end 81 having the first beveled portion 51 extending in the circumferential direction is connected to the second coil side end 82 protruding from the notch separated in the circumferential direction by six pitches from the notch 22 by the connecting portion, or the beveled portion of the outermost coil side end of every four notches in the circumferential direction extends in the circumferential direction in the reverse direction, and the beveled portions of the outermost coil side ends of the other notches extend in the circumferential direction in the forward direction. It is necessary to avoid interference in the outer diameter direction between the first chamfered portion 51 extending in the reverse direction in the circumferential direction and the third chamfered portion 53 extending in the forward direction in the circumferential direction of the adjacent third coil edge 83. Therefore, as shown in fig. 10 and 11, the following structure is provided: after the first coil edge 81 protrudes from the cutout 22, the third ramp portion 53 is avoided in the radial displacement region 90 toward the outer radial direction and then extends in the reverse direction in the ramp region 91.

Here, in the radial displacement region 90, the first coil edge 81 protrudes upward in the axial direction from the cutout groove 22, and after protruding in the outer radial direction through the radial bent portion 101, it passes through the axial bent portion 102 toward the axial direction upward. The radially displaced region 90 becomes the region from the exit of the slot 22 to the bending end of the axial bend 102. Further, the first coil edge 81 enters the slant area 91 after passing through the axial bend 102, extends in the circumferential direction through the circumferential bend 103, and faces upward in the axial direction through the axial bend 104. The diagonal region 91 becomes a region from the bending start point of the circumferential bending portion 103 to the bending end point of the axial bending portion 104.

Here, the axial distance between the radial displacement region 90 and the third chamfered portion 53 is set to Y and is shown in fig. 10. Note that, in fig. 10, the case where the first coil edge 81 suddenly extends in the circumferential direction from the exit of the slit 22 is shown by a one-dot chain line, and the distance from the third slope part 53 is X. The following structure is employed in the radial displacement region 90: the first coil side end 81 does not extend in the circumferential direction, but extends only in the radial direction or the axial direction so as to avoid the third slope part 53 extending in the forward direction in the circumferential direction. Therefore, Y can be made larger than X. In this way, the amount of radial displacement can be increased, and a margin for avoiding the intersection with the adjacent coil edge can be obtained. Therefore, the insulating coating film can be prevented from being damaged, and the reliability can be improved.

Embodiment mode 2

Embodiment 2 will be described only in terms of differences from embodiment 1. Fig. 12 is a schematic diagram showing a part of the edge of the outermost coil on the wire connection side in embodiment 2. Fig. 12 shows only the coil edge ends that protrude from seven notches that are continuous in the circumferential direction and are disposed on the outermost side in the radial direction. Fig. 13 is a sectional view showing a section CC in fig. 12. Only the first coil edge 81 and the third coil edge 83 are illustrated in fig. 13. After the first coil edge 81 protrudes from the outlet of the slit 22, the third slope part 53 is formed to avoid in the radial direction in the radial displacement region 90, and then to extend to the axially upper side, and then to extend in the reverse direction in the slope region 91. Here, in the radial displacement region 90, the first coil edge 81 projects axially upward from the outlet of the cutout groove 22, passes through the radial bend 101 to project radially outward, and then passes through the axial bend 102 to project axially upward. The radial displacement region 90 is formed from the axially upper end of the cutting groove 22 to the bending end point of the axial bend 102. Next, the first coil edge 81 passes from the radial displacement region 90 upward in the axial direction through the straight region 105 in which the coil extends upward in the axial direction, and enters the diagonal region 91. Then, it extends in the circumferential direction through the circumferential bent portion 103, and is directed axially upward through the axial bent portion 104. The diagonal region 91 is formed from a bending start point of the circumferential bending portion 103 to a bending end point of the axial bending portion 104. Here, since the straight line region 105 exists between the bending end point of the axial direction bent portion 102 as the end point of the radial direction shift region 90 and the bending start point of the circumferential direction bent portion 103 as the start point of the diagonal direction region 91, the bending end point of the axial direction bent portion 102 of the radial direction shift region 90 and the bending start point of the circumferential direction bent portion 103 of the diagonal direction region 91 do not overlap, and there is no need to continuously bend the axial direction bent portion 102 and the circumferential direction bent portion 103. Therefore, the load on the insulating coating film is suppressed, and the insulating coating film can be further prevented from being damaged, which has the effect of improving reliability.

Embodiment 3

Embodiment 3 will be described only in the point of difference from

embodiments

1 and 2. Fig. 14A is a schematic diagram showing the first coil edge 81 as the outermost diameter on the wire connection side as viewed from the outer diameter side in embodiment 3. Further, a schematic view of the first coil side end 81 as viewed from the circumferential direction is shown in fig. 14B. In fig. 14A and 14B, only the first coil side end 81 is illustrated. Here, in the radial displacement region 90 after the first coil edge 81 protrudes from the outlet of the notch 22, the coil is configured to be radially twisted about the rotation axis in the process from the radially bent portion 101 to the outer diameter direction. Fig. 15 shows a cross-sectional view D, E, F of the coil in the process of advancing from the inner diameter side to the outer diameter side of the coil from the end point of the radially bent portion 101 to the start point of the axially bent portion 102 in fig. 14B. The coil is twisted in the radial direction from a sectional view D on the inner diameter side through a sectional view E at an intermediate point to a sectional view F on the outer diameter side. As shown in fig. 14A, the coil is brought into a state of being inclined by θ 1 by applying the above-described torsion at the bending end point of the axial curved portion 102 of the radial displacement region 90. From here, the required bending angle θ 2 is bent at the circumferential bend 103 of the diagonal region 91. In the case where no torsion is applied in the radial direction in the radial displacement region 90, the circumferential bent portion 103 of the diagonal region 91 needs to be bent by an amount θ 3 obtained by adding θ 1 to the bending angle θ 2. By applying the twist, the bending angle at the circumferential bent portion 103 can be made θ 2, and the amount smaller than θ 3 by θ 1 can be reduced, so that the insulating coating film can be prevented from being damaged, and the reliability can be improved.

Embodiment 4

Embodiment 4 will be described only in the point of difference from embodiments 1 to 3. Fig. 16 is a schematic diagram showing a part of the wire connection side outermost coil end in embodiment 4, as viewed from the outer diameter side. Here, in the third coil rim end 83 having the first coil rim end 81 protruding from the notch 22 and having the first slope part 51 extending in the reverse direction in the circumferential direction, protruding from the notch 22 adjacent in the reverse direction in the circumferential direction, and having the third slope part 53 extending in the forward direction in the circumferential direction, the circumferential direction bent part 106 in the third slope part 53 has a structure located on the axially upper side than the radial direction displacement region 90 of the first coil rim end 81. By positioning the circumferential bent portion 106 axially above the radial displacement region 90, the axial position of the third chamfered portion 53 of the third coil end 83 is moved upward, and therefore, the distance between the radial displacement region 90 of the first coil end 81 and the third chamfered portion 53 can be increased. Therefore, the amount of radial displacement of the radial displacement region 90 can be increased, and therefore, damage to the insulating coating film can be prevented, which has the effect of improving reliability.

Embodiment 5

Embodiment 5 will be described only in terms of differences from embodiments 1 to 4. Fig. 17 is a schematic diagram showing a part of the wire connection side outermost coil end as viewed from the outer diameter side in embodiment 5. Only the outermost-diameter coil edge ends protruding from seven slits that are continuous in the circumferential direction are illustrated in fig. 17. The structure of each part is the same as that of embodiment 1. In fig. 17, the first coil side end 81 having the first beveled portion 51 projecting from the notch 22 and extending in the circumferential direction in the opposite direction is connected to the axial front end of each of the second coil side ends 82 having the second beveled portion 52 projecting from the notch 22 and extending in the circumferential direction in the forward direction by a connecting portion 108. The first beveled portion 51 of the first coil edge 81 projects from the notch 22 and projects in the circumferential direction in the opposite direction to the bending end point of the axially curved portion 104, and the axially upper portion of the bending end point of the axially curved portion 104 becomes the connecting portion 108, and similarly, the second beveled portion 52 of the second coil edge 82 projects from the notch 22 and projects in the circumferential direction in the forward direction to the bending end point of the axially curved portion 107, and the axially upper portion of the bending end point of the axially curved portion 107 becomes the connecting portion 108. Here, when the total coil length of the first beveled portion 51 of the first coil side end 81 is L1 and the total coil length of the second beveled portion 52 of the second coil side end 82 is L2, L1 is greater than L2, and L1 > L2 are satisfied. The radial displacement region is provided in the first slope part 51 having a long coil overall length among the slope parts of the two coil side ends connected by the connection part 108, and the bending of the second slope part 52 having a long coil overall length can be minimized, so that the insulating coating film of the second slope part 52 can be prevented from being damaged, and the reliability can be improved.

Embodiment 6

Embodiment 6 will be described only in points different from embodiments 1 to 5. Fig. 18 is a schematic diagram showing a part of the outermost coil edge on the wire connection side as viewed from the outer diameter side in embodiment 6. Only the outermost-diameter coil edge ends protruding from seven slits that are continuous in the circumferential direction are illustrated in fig. 18. Fig. 19 is a sectional view showing a section GG in fig. 18. Only the first coil edge 81 and the third coil edge 83 are illustrated in fig. 19. Here, an intersection point at which the first chamfered portion 51 of the first coil edge 81 projecting from the notch 22 and extending in the circumferential direction in the opposite direction and the third chamfered portion 53 of the third coil edge 83 projecting from the notch and extending in the circumferential direction in the forward direction adjacent to the first coil edge 81 in the circumferential direction in the opposite direction is set as a fixing point 200, and a radial gap between the first chamfered portion 51 and the third chamfered portion 53 at the fixing point 200 is filled with a fixing material 201, whereby the first chamfered portion 51 and the third chamfered portion 53 are fixed. For example, a heat-curable adhesive, a room-temperature curable adhesive, varnish, resin, or the like can be used as the fixing member 201. By fixing the first and third

beveled portions

51, 53 by the fixing member 201, the first and third

beveled portions

51, 53 can be prevented from sliding and damaging the insulating coating film due to vibration during use of the rotating electrical machine 11, and thus the reliability can be improved.

Embodiment 7

Embodiment 7 will be described only in terms of differences from embodiments 1 to 6. Fig. 20 is a schematic diagram showing a part of the wire connection side outermost coil end in embodiment 7, as viewed from the outer diameter side. Only the outermost-diameter coil edge ends protruding from seven slits that are continuous in the circumferential direction are illustrated in fig. 20. In fig. 20, the coil surface is covered with resin in a range 203 of a circumferential intersection 202 where a first chamfered portion 51 from the uppermost end in the axial direction of a connection portion including a terminal-side coil edge to a first coil edge 81 intersects with a third chamfered portion 53 of a third coil edge 83 adjacent in the circumferential direction of the first coil edge 81, protruding from a notch and extending in the circumferential direction in the forward direction. For example, powder resin may be fluidized and impregnated to apply the resin to the coil surface of the region 203. Since the coil surface is covered with the resin in the above-described range 203, a structure can be obtained in which the resin is filled in the gap between the first and third

beveled portions

51 and 53 at the circumferential intersection 202, and the circumferential intersection 202 has the same function as the fixing point 200 to which the fixed member 201 is fixed in embodiment 6. Further, since the entire periphery of the circumferential direction intersection 202 is covered with the resin, the first and third

chamfered portions

51 and 53 can be more firmly fixed. This ensures insulation of the connection portion between the coil ends, makes it possible to fix the first and third

beveled portions

51, 53 more firmly, and prevents the insulating coating film from being damaged by sliding of the first and third

beveled portions

51, 53 due to vibration during use of the rotating electrical machine 11.

Embodiment 8

Embodiment 8 will be described only in the point of difference from embodiments 1 to 7. Fig. 21 is a schematic diagram showing a part of the wire connection side outermost coil end as viewed from the outer diameter side in embodiment 8. Only the outermost-diameter coil edge ends protruding from seven slits that are continuous in the circumferential direction are illustrated in fig. 21. In fig. 21, the following structure is provided: in the ramp region 91 of the first ramp portion 51 of the first coil edge 81 projecting from the notch 22 and extending in the circumferential direction in the opposite direction, a buckling point 210 is provided at one or more locations in addition to the circumferential direction bent portion 103 as the starting point of the ramp region 91 and the axial direction bent portion 104 as the end point of the ramp region 91. By providing the buckling point 210, for example, the buckling angle at the circumferential bent portion 103 can be reduced, and the first coil edge 81 can be arranged at an angle close to perpendicular to the axial direction from the slit exit in the slant region 91. The following structure can be obtained: after exceeding a circumferential intersection 202 intersecting in the circumferential direction with a third chamfered portion 53 of a third coil rim end 83 adjacent in the circumferential reverse direction of the first coil rim end 81, projecting from the cutaway groove 22 and extending in the circumferential forward direction, it is further bent in the circumferential direction by a bending point 210 up to the axially bent portion 104. With the above-described configuration, the axial position of the circumferential intersection 202 between the first chamfered portion 51 of the first coil edge 81 and the third chamfered portion 53 of the third coil edge 83 can be moved upward in the axial direction. Thus, when the coil surface including the range 203 from the uppermost end in the axial direction including the connection portion of the side end of the wire-connection-side coil to the circumferential direction intersection 202 is covered with the resin, the axial direction position of the circumferential direction intersection 202 is moved upward in the axial direction, and therefore, the axial direction distance between the range 203 and the upper end of the wire-connection-side core of the stator core 9 can be increased. Therefore, the coating depth of the resin with respect to the entire axial length of the side end of the coil on the connection side can be reduced, and therefore, the cooling performance of the coil is improved, and the reliability is improved.

Embodiment 9

Embodiment 9 will be described only in points different from embodiments 1 to 8. Fig. 22 is a schematic diagram showing a part of the outermost coil edge on the wire connection side as viewed from the outer diameter side in embodiment 9. Only the outermost-diameter coil edge ends protruding from seven slits that are continuous in the circumferential direction are illustrated in fig. 22. In fig. 22, two or more points at which the middle of the first hypotenuse portion 51 of the first coil side end 81 projecting from the slit 22 and extending in the opposite direction in the circumferential direction intersects with the circumferential direction intersection of the coil side end hypotenuse portions where the first hypotenuse portion 51 intersects in the circumferential direction are set as the fixing points 220. Has the following structure: a radial gap between the first beveled portion 51 at each fixing point 220 and the coil side end beveled portion adjacent in the radial direction is filled with a fixing member 201, not shown, and the first beveled portion 51 and the coil side end beveled portion intersecting in the radial direction are fixed.

For example, a heat-curable adhesive, a room-temperature curable adhesive, varnish, resin, or the like can be used as the fixing member 201. By providing the multipoint fixing points 220, the fixing force of the first beveled portion 51 and the coil side end beveled portions adjacent in the circumferential direction including the first beveled portion 51 and the third beveled portion 53 can be further increased. Therefore, the first beveled portion 51 can be prevented from sliding against the coil side end beveled portion adjacent in the radial direction due to vibration during use of the rotating electrical machine, and the insulating coating film can be prevented from being damaged, which has the effect of improving reliability. As described in embodiment 7 or embodiment 8, the fixing points 220 can be provided by using the resin as the fixing member 201 by adopting a configuration in which the coil surface is covered with the resin in a range including all the circumferential direction intersections that are the fixing points 220.

The fixing point 220 may be a gap-filling fixture 201 not only in the beveled portion of the outermost coil end but also in the first beveled portion 51 and the wire-connection-side bent portion of the outermost coil end other than the outermost diameter, not shown. In this case, since the fixing point is increased, the fixing force is further increased, which has the effect of improving reliability. In addition, by providing the buckling point 210 at one or more locations in the diagonal region 91 of the first diagonal portion 51 in addition to the circumferential curved portion 103 at the start of the diagonal region 91 and the axial curved portion 104 at the end of the diagonal region 91, the fixing points 220 can be formed at an angle at which the first diagonal portion 51 and the core upper end of the stator core 9 are close to horizontal. The area where the first beveled portion 51 intersects the adjacent coil side end beveled portion in the circumferential direction increases at each fixing point 220. In this case, the fixing area is increased, the fixing force is further increased, and the reliability is improved.

Embodiment 10

Embodiment 10 will be described only in terms of differences from embodiments 1 to 9. Fig. 23 shows the coil edge end on the opposite side of the wire connection as viewed from the outer diameter side in embodiment 10. In fig. 23, the coil surface is covered with resin in a range 230 of a predetermined distance from the axially lowermost end to the axially upper side of the coil side end on the opposite side to the connection line. The stator core 9 is configured to have a distance H from the core lower end on the opposite side of the connection to the core up to a range 230. The distance H is preferably 3mm or more in order to ensure the cooling performance of the coil. For example, powder resin may be fluidized and impregnated to apply the resin to the coil surface of the region 230. Accordingly, by fixing the coil side ends on the opposite sides of the connection wire to each other, the insulating coating film can be prevented from being damaged by the coil side ends on the opposite sides of the connection wire sliding against each other due to vibration during use of the rotating electric machine 11, and therefore, the reliability can be improved.

For convenience of description of the present application, the case where the magnetic poles are eight poles, the number of slots of the stator core 9 is forty-eight, the stator winding 10 is three-phase winding, and the slots are formed in the stator core 9 at a ratio of two slots per pole per phase has been described above as an example, but the present invention is not limited to the configurations of the number of poles and the number of slots, and the same effects can be obtained in other combinations.

While various exemplary embodiments and examples have been described in the present application, various features, modes, and functions described in one or more embodiments are not limited to the application to specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, numerous modifications not illustrated are contemplated within the technical scope disclosed in the present specification. For example, the case where at least one component is modified, added, or omitted is included, and the case where at least one component is extracted and combined with the components of the other embodiments is also included.

Claims

1. A rotating electric machine has a stator in which a coil is formed by winding electric wires insulated and coated on a plurality of slots of a stator core disposed annularly around a rotating shaft,

it is characterized in that the preparation method is characterized in that,

the coil has:

a first coil edge extending circumferentially so as to cover a radially outermost adjacent coil edge provided in the plurality of slots from the radially outer side; and

a second coil side end connected with the first coil side end,

a radial displacement region extending radially outward from the cutout groove and a diagonal region extending in a circumferential direction while being inclined in an axial direction toward a connection portion with the second coil edge are provided in the first coil edge in the axial direction,

a radial bend portion that bends radially outward from an outlet of the cutout groove and an axial bend portion that bends in an axial direction and is connected to the ramp region are provided in the radial displacement region.

2. The rotating electric machine according to claim 1,

in the first coil side end, a straight line region extending in the axial direction is provided between the radial shift region and the diagonal region.

3. The rotating electric machine according to claim 1 or 2,

in the first coil edge, a twist toward a circumferential direction is formed in the radial displacement region.

4. The rotating electric machine according to any one of claims 1 to 3,

the first coil edge end is provided with a first inclined edge part which extends to the connecting part of the second coil edge end along the circumferential direction in the inclined area,

the second coil side end has a second beveled portion extending in a circumferentially opposite direction toward a connection with the first coil side end,

the length of the first beveled portion is greater than the length of the second beveled portion.

5. The rotating electric machine according to any one of claims 1 to 4,

a third coil edge that intersects the first coil edge at a radially inner side and extends in a circumferential direction while being inclined in an axial direction is formed at a notch adjacent to the first coil edge,

a bent portion of the third coil leg end that is directed in a circumferential direction is formed axially outward from the radially displaced region of the first coil leg end.

6. The rotating electric machine according to claim 5,

the third coil edge end is provided with a third bevel part which extends reversely to the circumferential direction,

a cross point at which the first beveled portion and the third beveled portion cross radially inward is fixed by a fixing member.

7. The rotating electric machine according to claim 5 or 6,

the coil surface from the intersection point where the first and third beveled portions intersect radially inward to one axial end including the connection portion of each coil side end in the axial direction is covered with resin.

8. The rotating electric machine according to claim 7,

the first coil side end is provided with two or more buckling points of the first slope part facing the circumferential direction in the slope region, and the distance from the outlet of the notch to the intersection is enlarged in the axial direction.

9. The rotating electric machine according to any one of claims 1 to 8,

and the intersection points of the side end of the first coil and the side ends of the other adjacent coils are fixed by a fixing piece.

10. The rotating electric machine according to any one of claims 1 to 9,

an outlet on an axially opposite side of an outlet of the slit where the coil edge end is located has a coil connecting between the slits, and a coil surface of the coil is covered with resin so as to be separated from the outlet of the slit on the axially opposite side by a constant distance in an axial direction.