Rotating Electric Machine

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

[Technical field]

[0001] The present invention relates to the technical field of a rotating electric machine including a stator and a rotor that rotates relative to the stator. [Background technology]

[0002] 2. Description of the Related Art A known stator for a rotating electric machine has a stator core and a coil attached to the stator core (see, for example, Patent Document 1).

[0003] In the rotating electric machine described in Patent Document 1, a temperature detector that detects the temperature of a coil, whose temperature rises when the coil is driven, is accommodated in an accommodating groove in the stator core in close proximity to or in contact with the coil and attached using an adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-170924 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the temperature detector is attached using an adhesive, there is a risk that good contact between the temperature detector and the coil cannot be ensured due to compatibility between the adhesive and the insulating coating of the coil. Also, if the adhesive gets between the temperature detector and the coil, there is a risk that the detection accuracy of the coil temperature will decrease.

[0006] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to ensure that a temperature detector is in contact with a coil without using adhesive and to improve the accuracy of detecting the coil temperature. [Means for solving the problem]

[0007] One embodiment of the present invention is a rotating electric machine including a stator and a rotor that rotates relative to the stator, the stator having a stator core in which a number of slots are formed at intervals in the circumferential direction, and a number of coils that are attached to the stator core by being inserted into each of the slots, the stator core being formed by laminating a number of electromagnetic steel plates, at least one of the electromagnetic steel plates being provided with an elastic deformation portion that is elastically deformed by being pressed by the coil inserted into the slot, When the direction in which the plurality of electromagnetic steel sheets are stacked is defined as a stacking direction, the electromagnetic steel sheet located at one end in the stacking direction among the plurality of electromagnetic steel sheets is defined as an end-side steel sheet, and the elastic deformation portion is provided on the end-side steel sheet, A temperature detector for detecting the temperature of the coil is attached to the elastic deformation portion, the coil has an insertion portion that is inserted into the slot and a protrusion portion that protrudes from the stator core, and the temperature detector is brought into contact with the protrusion portion when the elastic deformation portion is elastically deformed. Effect of the Invention

[0008] According to the present invention, the temperature detector is brought into contact with the protrusion while the elastic deformation portion is elastically deformed by the coil inserted into the slot, so that the temperature detector can be reliably brought into contact with the coil without using adhesive, and a stable contact state of the temperature detector with the coil is ensured, thereby improving the detection accuracy by the temperature detector. [Brief description of the drawings]

[0009] [Figure 1] 2 to 10, this figure shows an embodiment of a rotating electric machine according to the present invention, and is a diagram showing the schematic configuration of a vehicle. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] 11 is a conceptual diagram showing the states of the coil, the elastic deformation portion, and the temperature detector together with FIG. 7 to FIG. 10, and this diagram shows the state in which the coil is inserted into the slot. [Figure 7] FIG. 13 is a diagram showing a state in which the coil is bent. [Figure 8] FIG. 13 shows another state in which the coil is bent. [Figure 9] FIG. 13 is a diagram showing a state in which a coil is inserted into a slot in a modified example. [Figure 10] FIG. 13 is a diagram showing a state in which the coil is bent in the modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a rotating electrical machine according to the present invention will be described with reference to the accompanying drawings.

[0011] <Vehicle Overview> First, the schematic configuration of the vehicle will be described (see FIG. 1).

[0012] The 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 rotating electric machine 101 and the engine 102 via a torque converter, a friction clutch, or the like (not shown). Note that if the vehicle 100 is an electric vehicle, the engine 102 is not provided.

[0013] A differential device 104 is connected to the transmission 103. The differential device 104 is, for example, a rear differential device, and left and right rear drive shafts (not shown) are connected to the differential device 104, and rear wheels 105, 105 are respectively connected to the rear drive shafts. The driving force of the rotating electric machine 101 and the engine 102 is transmitted to the rear wheels 105, 105 via the differential device 104 and the rear drive shafts.

[0014] Although the above describes the schematic configuration of the vehicle 100, which is a two-wheel drive (2WD) type vehicle in which the rear wheels are driven, in the case of a two-wheel drive (2WD) type vehicle in which the front wheels are driven or a four-wheel drive (4WD) type vehicle, a front differential is provided instead of the differential 104 or in addition to the differential 104. When a front differential is provided, left and right front wheel drive shafts (not shown) are connected to the front differential, and front wheels 106, 106 are connected to the front wheel drive shafts, respectively. In this case, the driving force of the rotating electric machine 101 and the engine 102 is transmitted to the front wheels 106, 106 via the front differential and the front wheel drive shaft.

[0015] <Configuration of rotating electric machine> Next, the configuration of the rotating electric machine 101 will be described with reference to FIG.

[0016] The rotating electric machine 101 has a housing 1, a stator 2, and a rotor 3. The rotor 3 rotates relative to the housing 1 and the stator 2.

[0017] The housing 1 has a box-shaped case body 4 open on one side and a cover body 5 that closes the opening 4a of the case body 4. The internal space of the housing 1 is formed as a storage space 1a in which the stator 2 is stored.

[0018] A support hole 4b is formed in the approximate center of the end opposite the opening 4a of the case body 4. A ring-shaped fixing groove (not shown) is formed on the inner surface of the case body 4 around the support hole 4b.

[0019] A support hole 5a penetrating in the same direction as the support hole 4b is formed in the approximate center of the cover body 5. A ring-shaped fixing groove (not shown) that opens to the case body 4 side is formed around the support hole 5a in the cover body 5.

[0020] 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 plates 8.

[0021] The rotor 3 has a shaft 3a serving as a rotation fulcrum and a cylindrical rotor core 3b fitted onto the shaft 3a. The rotor core 3b is formed, for example, by laminating a plurality of electromagnetic steel plates. A magnetic body such as a magnet (not shown) is disposed inside the rotor core 3b.

[0022] The shaft 3a is supported by bearings 9, 9. The bearings 9, 9 are fitted into fixing grooves formed in the case body 4 and the cover body 5, respectively, and the outer rings are fixed. Portions of the shaft 3a near both ends are inserted into the bearings 9, 9, and both ends of the shaft 3a are inserted and supported in the support holes 4b of the case body 4 and the support holes 5a of the cover body 5, respectively. The bearings 9, 9 have the function of supporting the load of the rotor 3 and allowing the shaft 3a to rotate smoothly.

[0023] 2 to 7, the configuration of the stator 2 will be described in detail. As described above, the stator 2 has the stator core 6 and a plurality of coils .

[0024] The stator core 6 has a cylindrical yoke portion 10, a plurality of teeth portions 11 protruding radially inward from the yoke portion 10, and mounting portions 12, 12, 12 protruding radially outward from the yoke portion 10 (see FIG. 3).

[0025] The teeth 11 are positioned at equal intervals in the circumferential direction. The spaces between the teeth 11, 11 adjacent to each other in the circumferential direction are formed as slots 13 into which the coils 7 are inserted.

[0026] 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 by fasteners (not shown) that are inserted into the mounting holes 12a.

[0027] The electromagnetic steel sheets 8 have a substantially circular annular portion 8a, a plurality of protrusions 8b protruding radially inward from the annular portion 8a, and attachment pieces 8c, 8c, 8c protruding radially outward from the annular portion 8a (see Figs. 4 and 5). With a plurality of electromagnetic steel sheets 8 stacked, the plurality of annular portions 8a form a yoke portion 10, the plurality of protrusions 8b form a teeth portion 11, and the plurality of attachment pieces 8c form an attachment portion 12.

[0028] The multiple protrusions 8b are positioned at intervals in the circumferential direction. The spaces between adjacent protrusions 8b, 8b in the circumferential direction are formed as notches 8d. When the multiple electromagnetic steel sheets 8 are stacked, slots 13 are defined by the multiple notches 8d.

[0029] The mounting piece 8c has a hole 8e that constitutes the mounting hole 12a.

[0030] Of the plurality of electromagnetic steel sheets 8, the electromagnetic steel sheet 8 located at one end in the lamination direction is provided as an end-side steel sheet 8X (see FIG. 5).

[0031] 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 formed, for example, integrally with the protrusion 8b and protrudes from the protrusion 8b toward the adjacent protrusion 8b. The elastic deformation portion 14 protrudes from a position closer to the outer periphery in the radial direction of the protrusion 8b.

[0032] A temperature detector 15 is attached to the tip of the elastic deformation portion 14. The temperature detector 15 is, for example, a thermistor, and has a function of detecting the temperature of the coil 7 when in contact with a part of the coil 7 as described later.

[0033] Each of the coils 7 is attached to the stator core 6 with a portion of the coil 7 inserted into the slot 13 (see FIG. 2). The coils 7 are, for example, segment coils. The coils 7 function, for example, as a U-phase coil, a V-phase coil, or a W-phase coil.

[0034] 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-side steel plate 8X is located in the stacking direction. The coil 7 has an insertion portion 20 inserted into the slot 13 and a protruding portion 30 protruding from the stator core 6 (see Figs. 6 and 7).

[0035] 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, and as the elastic deformation portion 14 moves toward the tip side, it is elastically deformed in a direction away from the stator core 6 (see FIG. 6). Of the coils 7, the coil that presses the elastic deformation portion 14 is referred to as coil 7X. With the elastic deformation portion 14 in an elastically deformed state, the temperature detector 15 is pressed into contact with the protrusion 30 of the coil 7X by the elasticity of the elastic deformation portion 14.

[0036] When the coils 7 are inserted into the slots 13, the protruding portions 30 of the coils 7 are bent relative to the insertion portion 20 (see FIG. 7). Note that the protruding portions 30, 30 of the coils 7, 7 adjacent to the coil 7X in the circumferential direction are bent in the same direction as the protruding portion 30X of the coil 7X.

[0037] In a bent state, the protruding portion 30 is composed of a base end portion 31 connected to the insertion portion 20, a first bent portion 32 connected to the base end portion 31 and bent relative to the base end portion 31, an inclined portion 33 connected to the first bent portion 32, a second bent portion 34 connected to the inclined portion 33 and bent relative to the inclined portion 33, and a tip portion 35 connected to the second bent portion 34. The base end portion 31 and the tip portion 35 each extend in the axial direction of the stator core 6, and the inclined portion 33 is formed in a substantially linear shape inclined in a state in which it moves away from the stator core 6 toward the tip portion 35. The protruding portion 30 in the coil 7X is referred to as a protruding portion 30X, and the inclined portion 33 is referred to as an inclined portion 33X.

[0038] The bending directions of the first bent portion 32 and the second bent portion 34 are opposite to each other, with the first bent portion 32 being bent so as to be convex in the direction away from the stator core 6, and the second bent portion 34 being bent so as to be convex in the direction approaching the stator core 6.

[0039] The tip portion 35 of the coil 7 is joined by welding or the like to the tip portion of another coil (not shown).

[0040] Furthermore, such a bent shape of the protrusion 30 can be formed, for example, by holding the base end portion and the tip end portion of the multiple protrusions 30 by a first jig and a second jig (not shown), respectively, and moving the second jig in the circumferential direction of the stator core 6 relative to the first jig.

[0041] In a state in which all of the protrusions 30 are bent, the protrusion 30X of the coil 7X is bent in a direction in which the inclined portion 33X approaches the elastic deformation portion 14. Therefore, the elastically deformed elastic deformation portion 14 is pressed by the inclined portion 33X and further elastically deformed, and the temperature detector 15 is pressed with a strong force against the inclined portion 33X by the elasticity of the elastic deformation portion 14.

[0042] As described above, in the rotating electric machine 101, the temperature detector 15 is brought into contact with the protruding portion 30 (protruding portion 30X) in a state in which the elastic deformation portion 14 is elastically deformed (see FIGS. 6 and 7).

[0043] As a result, the temperature detector 15 comes into contact with the protruding portion 30 in a state in which 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 adhesive, and a stable contact state of the temperature detector 15 with the coil 7 is ensured, thereby improving the detection accuracy of the temperature detector 15. Furthermore, by improving the detection accuracy of the temperature detector 15, excessive output restriction of the rotating electric machine 101 according to the temperature of the coil 7 is prevented, thereby improving the electricity consumption.

[0044] In addition, since the elastic deformation portion 14 can be elastically deformed in the process of inserting the coil 7 into the slot 13 to bring the temperature detector 15 into contact with the coil 7, a dedicated process or dedicated parts for bringing the temperature detector 15 into contact with the coil 7 is not required, and the number of manufacturing processes and parts for the rotating electric machine 101 can be reduced. Therefore, the manufacturing cost of the rotating electric machine 101 can be reduced. Also, since it is not necessary to provide a structure for bringing the temperature detector 15 into contact with the coil 7 on the outer periphery of the stator core 6, the rotating electric machine 101 can be made smaller.

[0045] Incidentally, 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.

[0046] Furthermore, in the rotating electric machine 101, the elastic deformation portion 14 is provided on one of the electromagnetic steel plates 8. As a result, the 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.

[0047] However, the elastic deformation portions 14 may be provided on a plurality of the electromagnetic steel sheets 8. For example, when the elastic deformation portions 14 are provided on all the electromagnetic steel sheets 8 constituting the stator core 6, it is not necessary to separately manufacture the end side steel sheets 8X provided with the elastic deformation portions 14 and the electromagnetic steel sheets 8 not provided with the elastic deformation portions 14, so that the stator core 6 can be manufactured easily and at low cost.

[0048] Furthermore, in the rotating electric machine 101, the electromagnetic steel sheet 8 located at one end in the stacking direction among the multiple electromagnetic steel sheets 8 is the end-side steel sheet 8X, and the elastic deformation 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 located at one end in the stacking direction (end-side steel sheet 8X). Therefore, there is no need to insert wiring for the temperature detector 15 into the stator core 6, and wiring work for the temperature detector 15 attached to the elastic deformation portion 14 can be easily performed.

[0049] In the rotating electric machine 101, a plurality of coils 7 are inserted into one slot 13 in a radially aligned state. However, in such a configuration, if the elastically deforming portion 14 is positioned between the coils 7, 7 inserted in a lined-up state, there is a risk that the elastically deforming portion 14 is not pressed by the coils 7 and is not elastically deformed. On the other hand, since the slot 13 is formed in a shape in which the width in the circumferential direction becomes wider toward the outer diameter side, the coil 7 in the slot 13 is easily displaced toward the outer diameter side. Therefore, as described above, in the rotating electric machine 101, the elastically deforming portion 14 protrudes from a position closer to the outer periphery in the radial direction of the protrusion 8b. By positioning the elastically deforming portion 14 closer to the outer periphery in the radial direction of the slot 13 in this way, it becomes difficult for the elastically deforming portion 14 to be positioned between the coils 7, 7, and the elastically deforming portion 14 can be reliably pressed by the coils 7 to be elastically deformed.

[0050] Furthermore, in the rotating electric machine 101, the protrusion 30 (protrusion 30X) is bent in a direction approaching the elastic deformation portion 14 and is brought into contact with the temperature detector 15 (see FIG. 7). This brings the temperature detector 15 into contact with the protrusion 30 in a state in which the degree of deformation of the elastic deformation portion 14 is increased. This ensures a more stable contact state of the temperature detector 15 with the coil 7. In addition, since the protrusion 30X is bent in the process of bending all of the protrusions 30, a dedicated process or dedicated parts for bending the protrusion 30X is not required, and the temperature detector 15 can be reliably brought into contact with the coil 7 without increasing the number of manufacturing processes for the rotating electric machine 101.

[0051] In the above, an example has been shown in which the inclined portion 33X of the protrusion 30 (protrusion 30X) is in contact with the temperature detector 15, but other portions of the protrusion 30 bent in a direction approaching the elastic deformation portion 14 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, by bringing the inclined portion 33X into contact with the temperature detector 15, the inclined portion 33X is formed in a substantially linear shape, so that it is unlikely that the protrusion 30 will be in contact with the elastic deformation portion 14 but not with the temperature detector 15, and a stable contact state of the temperature detector 15 with the coil 7 can be ensured.

[0052] In addition, the above describes an example in which one of the protrusions 30, 30 located on both sides of the elastic deformation portion 14 is in contact with the temperature detector 15, but the protrusions 30, 30 located on both sides of the elastic deformation portion 14 may also be in contact with the temperature detector 15 (see Figure 8).

[0053] 8, the coil 7 located on the opposite side of the coil 7X with the elastic deformation portion 14 sandwiched therebetween is shown as 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 protruding portions 30, 30 of the coil 7X and the coil 7Y bent in the same direction.

[0054] In this manner, the protrusions 30, 30 located on both sides of the elastic deformation portion 14 are bent in the same direction and contact the temperature detector 15, so that the temperature detector 15 is sandwiched between the protrusions 30, 30 from both sides. Therefore, for example, even if 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.

[0055] <Modification> Although an example has been shown above in which the elastic deformation portion 14 is provided on the electromagnetic steel plate 8 (end side steel plate 8X), the elastic deformation portion 14 may also be provided as a separate member from the electromagnetic steel plate 8 (see Figures 9 and 10).

[0056] 9 and 10, an elastic deformation portion 14 is provided on a thin-plate-shaped detector mounting plate 50, a portion of which is inserted into a slot 13 and attached to 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.

[0057] The detector mounting plate 50 has an attachment portion 51 that is inserted into and attached to the slot 13, and an elastic deformation portion 14A that is continuous with the attachment portion 51. Before being elastically deformed, the elastic deformation portion 14A is bent, for example, at a substantially right angle to the attachment portion 51. A temperature detector 15 is attached to the tip of the elastic deformation portion 14A.

[0058] The mounting 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 elastic deformation portion 14A is pressed by the coil 7X and is elastically deformed, and the temperature detector 15 is pressed against the protrusion 30X of the coil 7X by the elasticity of the elastic deformation portion 14A (see FIG. 9).

[0059] When the protruding 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 with a strong force against the inclined portion 33X by the elasticity of the elastic deformation portion 14A (see FIG. 10). At this time, the temperature detector 15 comes 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.

[0060] In this way, even when the elastic deformation portion 14A is provided on the detector attachment plate 50 instead of the end side steel plate 8X, the temperature detector 15 is brought into contact with the protrusion 30 in a state where the elastic deformation portion 14A 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 without using adhesive, and a stable contact state of the temperature detector 15 with the coil is ensured, thereby improving the detection accuracy of the temperature detector 15. In addition, since the stator core 6 can be formed only from a plurality of electromagnetic steel plates 8 having a shape in which the elastic deformation portion 14 is not provided, there is no need to manufacture the end side steel plate 8X in the manufacture of the stator core 6, and the stator core 6 can be manufactured at low cost. [Explanation of symbols]

[0061] 1. Housing 2 Stator 3 Rotor 6 Stator core 7 Coil 8 Electrical steel sheet 8X End side steel plate 13 Slots 14 Elastic deformation part 15 Temperature detector 30 Protrusion 101 Rotating Electric Machine

Claims

1. A rotating electric machine including a stator and a rotor that rotates relative to the stator, The stator includes a stator core having a plurality of slots spaced apart from each other in a circumferential direction, and a plurality of coils attached to the stator core by being inserted into the respective slots, The stator core is formed by laminating a plurality of electromagnetic steel sheets, At least one of the electromagnetic steel sheets is provided with an elastic deformation portion that is elastically deformed by being pressed by the coil inserted into the slot, 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 stacked is defined as the stacking direction, Among the plurality of electromagnetic steel sheets, the electromagnetic steel sheet located at one end in the stacking direction is an end-side steel sheet, The elastic deformation portion is provided on the end side steel plate, a temperature detector for detecting a temperature of the coil is attached to the elastic deformation portion; the coil has an insertion portion that is inserted into the slot and a protrusion that protrudes from the stator core, The temperature detector is brought into contact with the protrusion in a state where the elastic deformation portion is elastically deformed. Rotating electric motor.

2. The protruding portion is bent in a direction approaching the elastic deformation portion and is brought into contact with the temperature detector. The rotating electric machine according to claim 1 .

3. The protrusions located on both sides of the elastic deformation portion are bent in the same direction and contact the temperature detector. The rotating electric machine according to claim 1 or 2.

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