JP2022141371A - Rotary electric machine - Google Patents

Abstract

To surely bring a temperature detector into contact with a coil without using an adhesive and improve the detection accuracy of the temperature of the coil.SOLUTION: In a rotating electric machine including a stator and a rotor rotated with respect to the stator, the stator includes a stator core on which a plurality of slots are formed in a peripheral direction to be apart from one another, and a plurality of coils which are inserted in the slots to be attached to the stator core. The stator core is formed by laminating a plurality of electromagnetic steel sheets, and at least one of the electromagnetic steel sheets is provided with an elastically deformable portion that is pressed by the coil inserted in the slot to be elastically deformed. A temperature detector for detecting the temperature of the coil is attached to at least one of the elastically deformable portions. The coil has an inserting portion to be inserted into the slot, and a protruding portion protruding from the stator core, and the temperature detector contacts the protruding portion while the elastically deformable portion is elastically deformed.SELECTED DRAWING: Figure 7

Description

The present invention relates to a technical field of a rotating electrical machine that includes a stator and a rotor that rotates with respect to the stator.

2. Description of the Related Art As a stator for a rotating electric machine, a stator having a stator core and coils attached to the stator core is known (see Patent Document 1, for example).

In the rotating electric machine described in Patent Document 1, a temperature detector that detects the temperature of a coil whose temperature rises during driving is housed in a housing groove of a stator core in a state of being close to or in contact with the coil, and is attached using an adhesive. installed.

JP 2018-170924 A

By the way, when the temperature detector is attached using an adhesive, there is a possibility that a good contact state between the temperature detector and the coil cannot be ensured due to compatibility between the adhesive and the insulating coating of the coil. In addition, if the adhesive enters between the temperature detector and the coil, there is a possibility that the accuracy of detecting the temperature of the coil may be lowered.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reliably bring a temperature detector into contact with a coil without using an adhesive and to increase the accuracy of detecting the temperature of the coil.

An embodiment of the present invention is a rotating electrical machine comprising a stator and a rotor rotated with respect to the stator, wherein the stator has a plurality of slots spaced apart in a circumferential direction. It has a stator core and a plurality of coils attached to the stator core by being inserted into the slots, the stator core is formed by laminating a plurality of electromagnetic steel sheets, and at least one of the electromagnetic steel sheets is inserted into the slot. An elastically deformable portion that is elastically deformed by being pressed by the coil is provided, a temperature detector for detecting the temperature of the coil is attached to at least one of the elastically deformable portions, and the coil is inserted into the slot. and a protruding portion protruding from the stator core, and the temperature detector is brought into contact with the protruding portion while the elastic deformation portion is elastically deformed.

According to the present invention, the temperature detector is brought into contact with the projecting portion while the elastically deformable portion is elastically deformed by the coil inserted into the slot. At the same time, a stable contact state of the temperature detector with the coil is ensured, and the detection accuracy of the temperature detector can be improved.

FIG. 2 to FIG. 10 show an embodiment of the rotating electric machine of the present invention, and show a schematic configuration of a vehicle. 1 is an exploded perspective view of a rotary electric machine; FIG. It is a perspective view of a stator core. 1 is a front view of an electromagnetic steel sheet; FIG. It is a front view of an edge part side steel plate. FIG. 11 is a conceptual diagram showing the states of the coil, the elastically deformable portion, and the temperature detector together with FIGS. 7 to 10, and shows the state in which the coil is inserted into the slot. It is a figure which shows the state by which the coil was bent. FIG. 10 is a diagram showing another state in which the coil is bent; It is a figure which shows the state by which the coil was inserted in the slot in a modification. It is a figure which shows the state by which the coil was bent in the modification.

EMBODIMENT OF THE INVENTION Below, the form for implementing the rotary electric machine of this invention is demonstrated with reference to an accompanying drawing.

<Outline configuration of vehicle>
First, the schematic configuration of the vehicle will be described (see FIG. 1).

A vehicle 100 is, for example, a hybrid electric vehicle, and has a rotating electric machine 101 and an engine (internal combustion engine) 102 . A transmission 103 is connected to the rotary electric machine 101 and the engine 102 by a torque converter, a friction clutch, or the like (not shown). Incidentally, when the vehicle 100 is an electric vehicle, the engine 102 is not provided.

A differential device 104 is connected to the transmission 103 . The differential device 104 is, for example, a rear differential device. Left and right rear wheel drive shafts (not shown) are connected to the differential device 104, and rear wheels 105, 105 are connected to the rear wheel drive shafts, respectively. The driving force of the rotating electrical machine 101 and the engine 102 is transmitted to rear wheels 105, 105 via a differential device 104 and a rear wheel drive shaft.

In the above description, the schematic configuration of the two-wheel drive (2WD) type vehicle 100 in which the rear wheels are driven has been described. In the case of a vehicle, a front differential is provided in place of or together with differential 104 . When a front differential device is provided, left and right front wheel drive shafts (not shown) are connected to the front differential device, and front wheels 106, 106 are connected to the front wheel drive shafts, respectively. In this case, the driving force of the rotary electric machine 101 and the engine 102 is transmitted to the front wheels 106, 106 via the front differential device and the front wheel drive shaft.

<Structure of rotating electric machine>
Next, the configuration of the rotating electrical machine 101 will be described with reference to FIG.

A rotating electric machine 101 has a housing 1 , a stator 2 and a rotor 3 . Rotor 3 is rotated with respect to housing 1 and stator 2 .

The housing 1 has a box-shaped case body 4 with one opening and a cover body 5 closing the opening 4 a of the case body 4 . An internal space of the housing 1 is formed as a storage space 1a in which the stator 2 is stored.

A support hole 4b is formed substantially in the center of the end of the case body 4 opposite to the opening 4a. An annular fixing groove (not shown) is formed around the support hole 4b on the inner surface side of the case body 4. As shown in FIG.

A support hole 5a is formed in the substantially central portion of the cover body 5 so as to penetrate in the same direction as the support hole 4b. A ring-shaped fixing groove (not shown) that opens toward the case body 4 is formed in the cover body 5 around the support hole 5a.

The stator 2 has a cylindrical stator core 6 and a plurality of coils 7 attached to the stator core 6 . The stator core 6 is formed by laminating a plurality of electromagnetic steel sheets 8 .

The rotor 3 has a shaft 3a serving as a rotation fulcrum and a cylindrical rotor core 3b fitted around the shaft 3a. The rotor core 3b is formed by laminating a plurality of electromagnetic steel sheets, for example. Magnetic bodies such as magnets (not shown) are arranged inside the rotor core 3b.

The shaft 3a is supported by bearings 9,9. The bearings 9, 9 are fitted into fixed grooves formed in the case body 4 and the cover body 5, respectively, and the outer rings thereof are fixed. Portions near both ends of the shaft 3a are inserted through the bearings 9, 9, respectively, and both ends of the shaft 3a are inserted into the support hole 4b of the case body 4 and the support hole 5a of the cover body 5 and supported. The bearings 9, 9 have a function of receiving the load of the rotor 3 and smoothly rotating the shaft 3a.

Next, the configuration of the stator 2 will be described in detail with reference to FIGS. 2 to 7. FIG. As described above, stator 2 has stator core 6 and a plurality of coils 7 .

The stator core 6 includes a cylindrical yoke portion 10, a plurality of teeth portions 11 projecting radially inward from the yoke portion 10, and mounting portions 12, 12, 12 projecting radially outward from the yoke portion 10. (see FIG. 3).

The plurality of tooth portions 11 are positioned at equal intervals in the circumferential direction. A space between the tooth portions 11, 11 adjacent in the circumferential direction is formed as a slot 13 into which the coil 7 is inserted.

Mounting holes 12a, 12a, 12a are formed in the mounting portions 12, 12, 12, respectively. The stator core 6 is attached to the housing 1 with fasteners (not shown) inserted through the attachment holes 12a.

The electromagnetic steel plate 8 includes a substantially annular annular portion 8a, a plurality of projections 8b projecting radially inwardly from the annular portion 8a, and mounting pieces 8c, 8c projecting radially outwardly from the annular portion 8a. , 8c (see FIGS. 4 and 5). In a state in which a plurality of electromagnetic steel sheets 8 are laminated, a yoke portion 10 is formed by a plurality of annular portions 8a, a tooth portion 11 is formed by a plurality of protrusions 8b, and a mounting portion 12 is formed by a plurality of mounting pieces 8c. be.

The plurality of protrusions 8b are spaced apart in the circumferential direction. A space between the protrusions 8b, 8b adjacent in the circumferential direction is formed as a notch 8d. Slots 13 are formed by a plurality of notches 8d in a state in which a plurality of electromagnetic steel sheets 8 are laminated.

The mounting piece 8c is formed with a hole 8e forming the mounting hole 12a.

Among the plurality of electromagnetic steel sheets 8, the electromagnetic steel sheet 8 positioned at one end in the stacking direction is provided as an end-side steel sheet 8X (see FIG. 5).

The end-side steel plate 8X is provided with an elastic deformation portion 14 in addition to the configuration of the electromagnetic steel plate 8 (see FIG. 5). The elastic deformation portion 14 is, for example, integrally formed with the protrusion 8b and protrudes from the protrusion 8b toward the adjacent protrusion 8b. The elastically deforming portion 14 protrudes from a position near the outer periphery in the radial direction of the protrusion 8b.

A temperature detector 15 is attached to the tip of the elastically deformable portion 14 . The temperature detector 15 is, for example, a thermistor, and has a function of detecting the temperature of the coil 7 while being in contact with a part of the coil 7 as described later.

Each of the plurality of coils 7 is partially inserted into the slot 13 and attached to the stator core 6 (see FIG. 2). Coil 7 is, for example, a segment coil. The coils 7 function, for example, as U-phase coils, V-phase coils, or W-phase coils, respectively.

The coil 7 is inserted into the slot 13 from the other end side, which is the end opposite to the side where the end steel plate 8X is positioned in the stacking direction. The coil 7 has an insertion portion 20 inserted into the slot 13 and a projecting portion 30 projecting from the stator core 6 (see FIGS. 6 and 7).

When the coil 7 is inserted into the slot 13 (notch 8d) in which the elastic deformation portion 14 is positioned, the coil 7 presses the elastic deformation portion 14 outward in the axial direction of the stator core 6. It is elastically deformed in a direction away from 6 (see FIG. 6). Note that the coil that presses the elastic deformation portion 14 among the coils 7 is referred to as a coil 7X. With the elastically deformable portion 14 being elastically deformed, the temperature detector 15 is pressed against the projecting portion 30 of the coil 7X by the elasticity of the elastically deformable portion 14 and brought into contact therewith.

When the coils 7 are inserted into the slots 13, the protrusions 30 of each coil 7 are bent with respect to the insertion portion 20 (see FIG. 7). In addition, the protrusions 30, 30 of the coils 7, 7 adjacent to the coil 7X in the circumferential direction are bent in the same direction as the direction in which the protrusion 30X of the coil 7X is bent.

In the bent state, the projecting portion 30 includes a proximal end portion 31 connected to the insertion portion 20, a first bent portion 32 connected to the proximal end portion 31 and bent with respect to the proximal end portion 31, and a first bent portion 32 connected to the proximal end portion 31. A slanted portion 33 connected to the first bent portion 32, a second bent portion 34 connected to the slanted portion 33 and bent with respect to the slanted portion 33, and a tip portion 35 connected to the second bent portion 34. and The base end portion 31 and the tip portion 35 each extend in the axial direction of the stator core 6 , and the slanted portion 33 has a substantially linear shape that is inclined away from the stator core 6 toward the tip portion 35 side. The projecting portion 30 of the coil 7X is referred to as a projecting portion 30X, and the inclined portion 33 is referred to as an inclined portion 33X.

The bending directions of the first bent portion 32 and the second bent portion 34 are opposite to each other. It is bent so as to be convex in a direction approaching the stator core 6 .

A tip portion 35 of the coil 7 is joined to a tip portion of another coil (not shown) by welding or the like.

In addition, such a bent shape of the protrusions 30 is obtained by holding the base end side portion and the tip end side portion of the plurality of protrusions 30 by a first jig and a second jig (not shown), respectively. , by moving the second jig in the circumferential direction of the stator core 6 with respect to the first jig.

In the state in which all the projecting portions 30 are bent, the projecting portion 30X of the coil 7X is bent in a direction in which the inclined portion 33X approaches the elastic deformation portion 14. As shown in FIG. Therefore, the elastically deformed elastically deforming portion 14 is pressed by the inclined portion 33X and further elastically deformed, and the elasticity of the elastically deforming portion 14 presses the temperature detector 15 with a strong force to the inclined portion 33X.

As described above, in the rotating electrical machine 101, the temperature detector 15 contacts the projecting portion 30 (projecting portion 30X) while the elastic deformation portion 14 is elastically deformed (see FIGS. 6 and 7).

As a result, the temperature detector 15 is brought into contact with the projecting portion 30 while the elastic deformation portion 14 is elastically deformed by the coil 7 inserted into the slot 13 . Therefore, the temperature detector 15 can be reliably brought into contact with the coil 7 without using an adhesive, and the stable contact state of the temperature detector 15 with the coil 7 can be ensured, so that the detection accuracy of the temperature detector 15 can be improved. can be enhanced. In addition, since the detection accuracy of the temperature detector 15 is enhanced, the output of the rotating electric machine 101 is prevented from being excessively restricted according to the temperature of the coil 7, so that the electric power consumption can be improved.

In addition, since the temperature detector 15 can be brought into contact with the coil 7 by elastically deforming the elastically deforming portion 14 in the process of inserting the coil 7 into the slot 13 , a special purpose for bringing the temperature detector 15 into contact with the coil 7 is provided. , and dedicated parts are not required, and the number of manufacturing processes and the number of parts of the rotating electric machine 101 can be reduced. Therefore, the manufacturing cost of the rotating electric machine 101 can be reduced. Moreover, since it is not necessary to provide a structure for contacting the temperature detector 15 to the coil 7 on the outer peripheral portion of the stator core 6, the size of the rotating electric machine 101 can be reduced.

The method of attaching the coil 7 to the stator core 6 may be, for example, concentrated winding or the like in addition to distributed winding.

In addition, in the rotating electric machine 101 , the elastic deformation portion 14 is provided on one electromagnetic steel plate 8 . As a result, one elastic deformation portion 14 is deformed by the coil 7 inserted into the slot 13 . Therefore, since the load applied from the electromagnetic steel plate 8 when the coil 7 is inserted is small, the coil 7 can be easily inserted, and the assembly of the rotating electric machine 101 can be improved.

However, the elastic deformation portion 14 may be provided on a plurality of electromagnetic steel plates 8 . For example, when the elastic deformation portions 14 are provided on all the electromagnetic steel plates 8 forming the stator core 6, the end portion side steel plate 8X provided with the elastic deformation portions 14 and the electromagnetic steel plate 8X not provided with the elastic deformation portions 14 are formed. Since there is no need to separately manufacture the steel plate 8, the stator core 6 can be manufactured easily and at low cost.

Further, in rotating electric machine 101, the electromagnetic steel sheet 8 located at one end in the stacking direction among the plurality of electromagnetic steel sheets 8 is the end-side steel sheet 8X, and the elastically deformable portion 14 is provided on the end-side steel sheet 8X. . As a result, the temperature detector 15 is attached to the electromagnetic steel sheet 8 (the end-side steel sheet 8X) located at one end in the stacking direction. Therefore, it is not necessary to insert the wiring for the temperature detector 15 inside the stator core 6, and the wiring work for the temperature detector 15 attached to the elastically deformable portion 14 can be easily performed.

In the rotating electric machine 101, a plurality of coils 7 are inserted into one slot 13 in a state of being aligned in the radial direction. However, in such a configuration, if the elastically deformable portion 14 is positioned between the coils 7 inserted side by side, the elastically deformable portion 14 may not be pressed by the coil 7 and elastically deformed. On the other hand, since the slot 13 is formed in such a shape that the width in the circumferential direction increases toward the outer diameter side, the coil 7 in the slot 13 is easily displaced to the outer diameter side. Therefore, as described above, in the rotary electric machine 101, the elastically deformable portion 14 protrudes from a position closer to the outer periphery in the radial direction of the protrusion 8b. Since the elastic deformation portion 14 is positioned closer to the outer periphery in the radial direction of the slot 13 in this manner, the elastic deformation portion 14 is less likely to be positioned between the coils 7 , and the elastic deformation portion 14 is reliably pressed by the coil 7 . can be elastically deformed.

In rotating electric machine 101, protrusion 30 (protrusion 30X) contacts temperature detector 15 while being bent in a direction approaching elastic deformation section 14 (see FIG. 7). As a result, the temperature detector 15 is brought into contact with the projecting portion 30 while the degree of deformation of the elastic deformation portion 14 is increased. Therefore, a more stable contact state of the temperature detector 15 with the coil 7 can be ensured. In addition, since the protruding portions 30X are bent in the process of bending all the protruding portions 30, a dedicated process and dedicated parts for bending the protruding portions 30X are not required, and the number of manufacturing steps of the rotating electric machine 101 is increased. The temperature detector 15 can be brought into contact with the coil 7 without fail.

In the above description, the inclined portion 33X of the projecting portion 30 (projecting portion 30X) is in contact with the temperature detector 15. A portion may be in contact with the temperature detector 15 . For example, the first bent portion 32 or the second bent portion 34 may be in contact with the temperature detector 15 . However, since the inclined portion 33X contacts the temperature detector 15, the inclined portion 33X is formed in a substantially straight line. A stable contact state of the temperature detector 15 with respect to the coil 7 can be ensured.

In the above description, one of the protrusions 30, 30 positioned on both sides of the elastically deformable portion 14 is in contact with the temperature detector 15. The positioned protrusions 30, 30 may be in contact with the temperature detector 15 (see FIG. 8).

In FIG. 8, the coil 7 located on the opposite side of the coil 7X with the elastic deformation portion 14 interposed therebetween is indicated as the coil 7Y. The temperature detector 15 is brought into contact with, for example, the inclined portion 33X of the coil 7X and the first bent portion 32 of the coil 7Y with the protrusions 30, 30 of the coil 7X and the coil 7Y bent in the same direction.

In this manner, the protrusions 30, 30 positioned on both sides of the elastically deforming portion 14 are bent in the same direction and are brought into contact with the temperature detector 15, so that the temperature detector 15 can move the protrusions 30, 30 from both sides. sandwiched between 30 Therefore, for example, even when vibration or the like occurs, the temperature detector 15 is less likely to separate from the coil 7, and a more stable contact state of the temperature detector 15 with the coil 7 can be ensured.

<Modification>
Although an example in which the elastically deformable portion 14 is provided on the electromagnetic steel plate 8 (the end-side steel plate 8X) has been described above, the elastically deformable portion 14 may be provided as a separate member from the electromagnetic steel plate 8 ( 9 and 10).

In the example shown in FIGS. 9 and 10 , the elastically deformable portion 14 is provided on a thin detector mounting plate 50 which is partly inserted into the slot 13 and mounted on the stator core 6 . The elastic deformation portion 14 provided on the detector mounting plate 50 is referred to as an elastic deformation portion 14A.

The detector mounting plate 50 has an attached portion 51 that is inserted into the slot 13 and attached, and an elastic deformation portion 14A that is continuous with the attached portion 51 . The elastically deformable portion 14A is bent at, for example, a substantially right angle with respect to the attached portion 51 before being elastically deformed. A temperature detector 15 is attached to the tip of the elastically deformable portion 14A.

The attached portion 51 is attached by being inserted into the slot 13 from the direction opposite to the direction in which the coil 7 is inserted into the slot 13 . When the coil 7X is inserted into the slot 13, the elastically deformable portion 14A is elastically deformed by being pressed by the coil 7X, and the temperature detector 15 is pressed against the projecting portion 30X of the coil 7X by the elasticity of the elastically deformable portion 14A ( See Figure 9).

When the projecting portion 30X is bent in this state, the elastic deformation portion 14A is pressed by the inclined portion 33X and is further elastically deformed, and the temperature detector 15 is pressed by the inclined portion 33X with a strong force due to the elasticity of the elastic deformation portion 14A. (See FIG. 10). At this time, the temperature detector 15 is brought into contact with, for example, the inclined portion 33X of the coil 7X or the inclined portion 33X and the first bent portion 32 of the coil 7Y.

Thus, even when the elastically deformable portion 14A is provided on the detector mounting plate 50 instead of the end-side steel plate 8X, the coil 7 inserted into the slot 13 elastically deforms the elastically deformable portion 14A. The temperature detector 15 is brought into contact with the protrusion 30 . Therefore, the temperature detector 15 can be reliably brought into contact with the coil without using an adhesive, and the stable contact state of the temperature detector 15 with the coil can be ensured to improve the detection accuracy of the temperature detector 15. can be done. In addition, since the stator core 6 can be configured only by a plurality of electromagnetic steel plates 8 having a shape in which the elastically deformable portion 14 is not provided, there is no need to manufacture the end portion side steel plates 8X in manufacturing the stator core 6, and the stator core 6 can be manufactured. It can be manufactured at low cost.

1 housing 2 stator 3 rotor 6 stator core 7 coil 8 electromagnetic steel plate 8X end side steel plate 13 slot 14 elastic deformation portion 15 temperature detector 30 projecting portion 101 rotary electric machine

Claims (5)

A rotating electric machine comprising a stator and a rotor rotated with respect to the stator,
The stator has a stator core formed with a plurality of slots spaced apart in a circumferential direction, and a plurality of coils attached to the stator core by being inserted into the slots, respectively;
The stator core is formed by laminating a plurality of electromagnetic steel sheets,
At least one of the electromagnetic steel plates is provided with an elastically deforming portion that is elastically deformed by being pressed by the coil inserted in the slot,
A temperature detector for detecting the temperature of the coil is attached to at least one of the elastically deformable parts,
the coil has an inserting portion inserted into the slot and a protruding portion protruding from the stator core;
The rotating electrical machine, wherein the temperature detector is brought into contact with the projecting portion while the elastically deforming portion is elastically deformed. The rotary electric machine according to claim 1, wherein the elastic deformation portion is provided on one of the electromagnetic steel plates. When the direction in which the plurality of electromagnetic steel sheets are laminated is the lamination direction,
The electromagnetic steel sheet positioned at one end in the stacking direction among the plurality of electromagnetic steel sheets is the end-side steel sheet,
The rotary electric machine according to claim 2, wherein the elastic deformation portion is provided on the end-side steel plate. 4. The electric rotating machine according to claim 1, wherein the protrusion contacts the temperature detector while being bent in a direction approaching the elastically deformable portion. 5. The electric rotating machine according to claim 1, wherein the protrusions positioned on both sides of the elastically deformable portion are bent in the same direction and come into contact with the temperature detector. .

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