JP2018088790A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the temperature of a stator winding at an optimal place for a mounting situation of a rotary electric machine.SOLUTION: A stator 20 of a rotary electric machine 10 comprises a stator core 30. The stator core 30 includes: a circular back yoke 32; a plurality of teeth 34 projecting to an inner peripheral side from the back yoke 32; and a plurality of slots 36 each defined by a space between the adjacent teeth 34. The stator 20 comprises a stator winding 40 wound on each tooth 34 of the stator core 30. The stator 20 further comprises teeth cuff support parts 52 each structured by an insulation member that is arranged between an axial end surface of each tooth 34 and the stator winding 40 to guide a curving form of the stator winding 40. The stator comprises: element arrangement holes 60 each for a temperature detection element 62 provided in each tooth cuff support part 52; and the temperature detection element 62 arranged on at least one of a plurality of element arrangement holes 60.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a rotating electrical machine and relates to a rotating electrical machine including a temperature detection element that detects the temperature of a stator winding.

  When the rotating electrical machine operates, heat is generated by a drive current flowing through the stator winding, and the temperature of the rotating electrical machine rises. Since the temperature of the stator around which the stator winding is wound is lower than that of the stator winding, in order to correctly detect the temperature of the stator winding, it is necessary to avoid being affected by the temperature of the stator core. .

  Patent Document 1 discloses that in a stator winding using a segment coil, a temperature detection element is arranged in a minute gap between a coil end of a U-shaped segment coil and a deformed segment coil for a crossover. ing.

  Patent Document 2 discloses that in a concentrated winding coil wound around a stator core via an insulator, a temperature detection element is arranged in an element arrangement hole provided in a flange portion on the back yoke side of the insulator.

  In Patent Document 3, in the insulating bobbin interposed between the winding and the teeth of the stator core, the temperature detection element fixing groove is provided on the outer peripheral side, and the portion that hits the back side of the temperature detection element fixing groove on the inner peripheral side, It is disclosed that a void portion having a size that is not impregnated even when varnish is dropped is provided. This states that the temperature detection element and the stator core are not impregnated with varnish, and the temperature detection element is not affected by the heat of the stator core.

JP 2014-090546 A Japanese Patent No. 5959715 JP 2010-213392 A

  The stator winding is wound around each of a plurality of teeth of the stator core. The rotating electrical machine is controlled so that the maximum temperature of the stator winding is not more than a predetermined temperature. The position where the stator winding is at the maximum temperature is the mounting angle of the rotating electrical machine with respect to the supply of refrigerant for the rotating electrical machine, the power line Depending on the take-out position, etc., it depends on the mounting situation of each rotating electric machine. Therefore, a rotating electrical machine that can detect the temperature of the stator winding at an optimum location according to the mounting state of the rotating electrical machine is desired.

  A rotating electrical machine according to the present disclosure is a rotating electrical machine including a rotor having a rotating shaft and a stator disposed at a predetermined interval from an outer peripheral surface of the rotor. The stator includes an annular back yoke, a back A stator core including a plurality of teeth protruding from the yoke to the inner peripheral side, and a plurality of slots serving as spaces between adjacent teeth, a stator winding wound around the teeth of the stator core, and axial end surfaces of the plurality of teeth A plurality of tea scaffle portions made of an insulating material disposed between the stator windings and guiding the bent shape of the stator windings; a plurality of element arrangement holes provided in the plurality of tea scuffer portions; and a plurality of elements And a temperature detection element arranged in at least one of the arrangement holes.

  According to the above configuration, since the element arrangement hole for the temperature detection element is provided for each tooth, it is possible to arrange the temperature detection element in the element arrangement hole at the optimum location according to the mounting state of the rotating electrical machine.

  According to the rotating electrical machine according to the above configuration, the temperature of the stator winding can be detected at an optimum location according to the mounting state of the rotating electrical machine.

It is a perspective view of the stator in the rotary electric machine which concerns on embodiment. FIG. 2 is a top view showing a state before the stator winding is wound in the stator of FIG. 1. FIG. 2A is an overall view, and FIG. 2B is an enlarged view of a portion B in FIG. It is sectional drawing along CC line of FIG.2 (b). FIG. 2 is a perspective view of the stator of FIG. 1 viewed from the inner periphery side. In the rotary electric machine of embodiment, it is a figure which shows the temperature distribution of the stator winding in an operation state. FIG. 5A is a diagram showing eight temperature detection positions for the stator winding, and FIG. 5B is a diagram showing eight detected temperatures.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, as the rotating electric machine, for vehicle mounting will be described, but this is an example for explanation and may be used for purposes other than mounting on the vehicle.

  The shape, dimensions, the number of teeth and slots, the material, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the stator of the rotating electrical machine. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a diagram showing a configuration of a rotating electrical machine 10 mounted on a vehicle. The rotating electrical machine is a three-phase synchronous rotating electrical machine that functions as an electric motor when the vehicle is powered and functions as a generator when the vehicle is braking. The rotating electrical machine 10 includes a rotor 12 and a stator 20.

  The rotor 12 is a rotor having a rotor body 14 having a plurality of magnetic poles and a rotating shaft 16. Although not illustrated, the rotor body 14 is an embedded magnet type rotor body in which a plurality of permanent magnets are embedded in a magnetic rotor core. This is an exemplification, and may be a rotor body 14 having a permanent magnet on the outer peripheral side or a reluctance rotor body 14. The rotating shaft 16 is fixed to the rotor body 14 and serves as an output shaft of the rotating electrical machine 10.

  The stator 20 is a stator that is arranged on the outer peripheral side of the rotor 12 at a predetermined interval. The stator 20 has an annular shape and includes three attachment holes 22, 23, and 24 (see FIGS. 2 and 5 for the attachment holes 24) provided on the outer periphery of the annular shape. The mounting holes 22, 23 and 24 are used for mounting the stator 20 to a motor case (not shown), and the motor case is fixed to the vehicle by a case mounting hole or the like. The positions of the mounting holes 22, 23, and 24 serve as a reference for determining the mounting direction of the rotating electrical machine 10 in the vehicle.

  Stator 20 includes a stator core 30 and a stator winding 40. The stator core 30 is a magnetic part having a central hole in which the rotor 12 is disposed, and includes an annular back yoke 32 and a plurality of teeth 34 protruding from the back yoke 32 toward the inner peripheral side. A space between adjacent teeth 34 is a slot 36.

  The stator core 30 includes a back yoke 32 and teeth 34, and is a laminated body in which a predetermined number of annular magnetic thin plates formed in a predetermined shape so as to form slots 36 are stacked in the axial direction. Both surfaces of the magnetic thin plate are electrically insulated. As a material of the magnetic thin plate, an electromagnetic steel plate which is a kind of silicon steel plate can be used. Instead of the laminated body of magnetic thin plates, the stator core 30 may be formed by integrally molding magnetic powder.

  The stator winding 40 is a three-phase distributed winding, and is formed by winding one phase winding across a plurality of teeth 34. A plurality of segment coils can be used to form each phase winding. The segment coil is a conductor wire with an insulation film that is formed in a substantially U shape by coating an insulation film around the conductor wire except for both ends. A copper wire, a copper tin alloy wire, a silver plating copper tin alloy wire, etc. are used as a strand of the conductor wire with an insulating film. As the insulating film, a polyamide-imide enamel film is used.

  Of the substantially U-shape, two straight portions extending straight from a portion formed by bending into a chevron are formed apart from each other by a predetermined slot interval, and are respectively formed in two slots 36 separated by a predetermined slot interval in the stator core 30. The part to be inserted. When the portion formed by bending the segment coil into a chevron is the anti-lead side of the stator core 30 and the two straight portions are inserted into the slot 36, the lead portion from which the insulating film at the tip of the straight portion is peeled off is the lead side of the stator core 30. Stick out. The protruding lead portion is appropriately bent outside the lead-side axial end face of the stator core 30 and joined to the lead portion of another segment coil to form a coil end portion on the lead side of the stator 20. A portion formed by bending into a chevron forms a coil end portion on the opposite lead side of the stator 20.

  In the coil end portion on the lead side of the stator 20, the lead portions of the plurality of segment coils are connected to each other by a predetermined connection method to form each phase winding. The two terminals of each phase winding formed in the coil end portion on the lead side are connected to each other to form a neutral point, and the other terminal is drawn out of the stator core 30. The three-phase power line 28 of the stator 20 is obtained.

  In the above description, the substantially U-shaped segment coil is described for forming the stator winding 40. However, this is an example for explanation, and a deformed segment coil other than the substantially U-shaped coil may be used. The stator winding 40 may be formed by a continuous winding without using a coil.

  FIG. 1 shows an axial direction, a radial direction, and a circumferential direction. The axial direction is a direction along the central axis of the rotating electrical machine 10. In the stator core 30, in the axial direction, the side from which the three-phase power line 28 is drawn out is the lead side direction, and the opposite side is the anti-lead side direction. In the example of FIG. 1, the upper side of the paper surface is the lead side direction, and the lower side is the anti-lead side direction. The radial direction is a radial direction passing through the central axis in a plane perpendicular to the axial direction, the direction toward the inner diameter side is the inner circumferential direction, and the direction toward the outer diameter side is the outer circumferential direction. The circumferential direction is a direction along the circumferential direction around the central axis.

  In FIG. 1, a component cuff 50 arranged between the axial end surface of the stator core 30 and the stator winding 40 is formed by bending the winding inserted into the slot 36 on the coil end portion side. It is a protective member that prevents direct contact with the end face. Thereby, damage to the stator winding 40 can be suppressed. The component cuffs 50 will be described with reference to FIGS.

  2A and 2B are top views showing a state before the stator winding 40 is wound in the stator 20, FIG. 2A is an overall view, and FIG. 2B is an enlarged view of a portion B of FIG. is there. In FIG. 2A, the part cuff 50 is partially broken to expose the back yoke 32, the teeth 34, and the slot 36 of the stator core 30, and the positional relationship with the part cuff 50 is shown.

  The component cuffs 50 are respectively arranged between the lead-side axial end face 38 (see FIGS. 3 and 4) of each tooth 34 and the stator winding 40 to electrically guide the bent shape of the stator winding 40. It is an insulating material. The axial end surface 38 is not the side surface of the tooth 34 but the same surface as the axial end surface of the stator core 30. The component cuffer 50 includes a tea cuff member 52 extending radially on the axial end surface 38 of each tooth 34. The number of the tea scuff parts 52 is the same as the number of the teeth 34, and is 48, which is a multiple of 3 in the example of FIG. The component cuffer 50 includes an inner peripheral side annular portion 54 that connects the inner peripheral sides of the tea scuffer portions 52 to each other, and an outer peripheral side annular portion 56 that connects the outer peripheral sides of the tea scuffer portions 52 to each other. An opening 58 surrounded by the tea scuffer portion 52, the inner peripheral annular portion 54, and the outer peripheral annular portion 56 corresponds to the slot 36 and is a space into which the stator winding 40 is inserted. The number of openings 58 is the same as the number of slots 36, which is 48 in the example of FIG.

  FIG. 2B is a partially enlarged view of FIG. The element arrangement hole 60 provided in each tea scuffer portion 52 is a hole for inserting and arranging the temperature detection element 62 for temperature detection of the stator winding 40. The element arrangement hole 60 is a bottomed hole that opens on the outer peripheral surface of the outer peripheral side annular portion 56 and does not penetrate to the inner peripheral side annular portion 54. The reason for the bottomed hole is that the inner circumferential side annular portion 54 is a portion facing the outer circumferential surface of the rotor 12 that is a rotor, and is preferably a smooth surface.

  The number of the element arrangement holes 60 is the same as the number of the tea cuff parts 52 and is 48. The temperature detection element 62 is arranged and fixed in at least one of the 48 element arrangement holes 60. As a fixing means, a method of filling a fixing resin in a gap between the opening of the element arrangement hole 60 in the outer peripheral side annular portion 56 and the outer peripheral surface of the temperature detection element 62 is used. Instead, an appropriate fixing member may be provided on the outer peripheral side annular portion 56 or the axial end surface of the stator core 30 on the lead side.

  FIG. 3 is a cross-sectional view taken along the line CC of FIG. Here, the stator windings 40a and 40b inserted into the opening 58 and the slot 36 are indicated by two-dot chain lines. The opening width along the circumferential direction of the opening 58 is set to be narrower than the opening width of the slot 36, and the circumferential cross section of each tea scuffer portion 52 is configured by a smooth curve. As a result, when the stator winding 40 is bent on the lead side of the stator core 30, the stator winding 40 bends smoothly, and the end face of the stator core 30 and the stator winding 40 do not directly contact each other, and the stator winding 40 is damaged. Can be suppressed. As such a component cuffer 50, it is possible to use an electrically insulating plastic molded into a predetermined shape.

  FIG. 4 is a perspective view of the stator 20 of FIG. 1 as viewed from the inner peripheral side. The element arrangement hole 60 provided along the radial direction inside the tea cuff member 52 does not open to the inner peripheral side annular portion 54 of the component cuff member 50. The insulator 39 disposed inside the slot 36 is an insulating sheet for ensuring electrical insulation between the stator windings 40 c, 40 d, 40 e, 40 f and 40 g and the inner wall surface of the stator core 30.

  The effect of the above configuration will be described with reference to FIG. FIG. 5 is a diagram showing the temperature distribution of the stator winding 40 in the mounting state in the rotating electrical machine 10. Examples of mounting conditions of the rotating electrical machine 10 that affect the temperature of the stator winding 40 include the storage or circulation state of the refrigerant in the motor case, the connection state to the outside of the three-phase power line 28, the rotor 12 and the stator. The asymmetry about each direction of 20 shapes is mentioned. Specifically, it is affected by the oil immersion state of the rotating electrical machine 10 in the cooling oil in the motor case, the drawing direction of the three-phase power line 28, and the like. Since these differ depending on the specification of each vehicle and the mounting state of each rotating electrical machine 10, the temperature distribution of the stator winding 40 differs for each rotating electrical machine 10 and for each vehicle on which the rotating electrical machine 10 is mounted. Come.

  FIG. 5 shows the result of measuring the temperature distribution of the stator winding 40 in the operating state in which the rotating electrical machine 10 is operated at 3000 rpm under a certain mounting condition. (A) shows eight temperature detection positions for the stator winding 40. (B) is a figure which shows the detected temperature of the stator winding 40 in these eight places. As shown in (b), at the temperature detection position 2, the detection temperature = 131.3 ° C. is the lowest value, and at the temperature detection position 4, the detection temperature = 171.4 ° C. is the highest value. The difference between the maximum value and the minimum value of the detected temperature for 360 degrees in the circumferential direction is 40.1 ° C. In a general rotating electrical machine, the mounting location of the temperature detection element 62 is predetermined. If the temperature detection element 62 is mounted at the temperature detection position 2, the control system of the rotating electrical machine 10 cannot control the maximum temperature of the stator winding 40 to be equal to or lower than a predetermined temperature.

  According to the configuration of FIGS. 1 to 4, in the rotating electrical machine 10, the element disposition hole 60 is provided for each tea scuffer portion 52, so that the temperature detection element 62 is at an arbitrary position along the circumferential direction of the stator 20. It can be arranged in the element arrangement hole 60. The number of the tea scuffer portions 52 is the number of teeth 34 = 48, and is provided at an angular interval of 7.5 degrees along the circumferential direction. In the above example, the difference between the maximum value and the minimum value of the detected temperature for 360 degrees in the circumferential direction is 40.1 ° C. Therefore, roughly speaking, the accuracy of the stator winding 40 is approximately 1 ° C. The temperature detecting element 62 can be disposed at the highest temperature location. As a result, the temperature of the stator winding can be detected at an optimum location according to the mounting state of the rotating electrical machine 10. Moreover, since the temperature detection element 62 is arrange | positioned in the element arrangement | positioning hole 60 which is a bottomed hole provided in the tea scuffer part 52, the damage by external forces, such as a vibration, is suppressed.

  In the above description, the component cuff 50 includes the tea cuff part 52, the inner peripheral side annular part 54, and the outer peripheral side annular part 56. However, either the inner peripheral side annular part 54 or the outer peripheral side annular part 56 is included. May be omitted. Further, in some cases, both the inner circumferential side annular portion 54 and the outer circumferential side annular portion 56 may be omitted, and the component cuff 50 having only the tea cuff portion 52 may be used.

  In the above description, the element arrangement hole 60 for the temperature detection element 62 is provided for each of the tea scuffer portions 52. However, an appropriate number may be used depending on the specifications of the control system of the rotating electrical machine 10 and the number of teeth 34 in the stator core 30. The element arrangement hole 60 can be obtained. For example, the number of the tea cuff parts 52 can be set to 24 in the case where the interval of 15 degrees is sufficient even if the angle interval is not 7.5 degrees along the circumferential direction of the stator 20.

  A rotating electrical machine 10 according to the present embodiment is a rotating electrical machine including a rotor 12 having a rotating shaft 16 and a stator 20 arranged at a predetermined interval from the outer peripheral surface of the rotor 12. The stator 20 includes a stator core 30. The stator core 30 includes an annular back yoke 32, a plurality of teeth 34 protruding from the back yoke 32 toward the inner peripheral side, and a plurality of slots 36 that are spaces between adjacent teeth 34. The stator 20 includes a stator winding 40 wound around each tooth 34 of the stator core 30. Furthermore, the stator 20 includes a teeth cuff portion 52 made of an insulating material that is disposed between the axial end face of each tooth 34 and the stator winding 40 and guides the bent shape of the stator winding 40. In addition, an element arrangement hole 60 for the temperature detection element 62 provided in each tea scuffer portion 52 and a temperature detection element 62 arranged in at least one of the plurality of element arrangement holes 60 are provided.

  10 rotating electrical machines, 12 rotors, 14 rotor bodies, 16 rotating shafts, 20 stators, 22, 23, 24 mounting holes, 28 three-phase power lines, 30 stator cores, 32 back yokes, 34 teeth, 36 slots, 38 axial end faces, 39 Insulator, 40, 40a, 40b, 40c, 40d, 40e, 40f, 40g Stator winding, 50 parts cuff, 52 tea cuff part, 54 inner ring part, 56 outer ring part, 58 opening part, 60 element arrangement Hole, 62 Temperature sensing element.

Claims (1)

A rotating electrical machine including a rotor having a rotating shaft and a stator disposed at a predetermined interval from an outer peripheral surface of the rotor, wherein the stator is
A stator core including an annular back yoke, a plurality of teeth protruding from the back yoke to the inner peripheral side, and a plurality of slots which are spaces between the adjacent teeth;
A stator winding wound around the teeth of the stator core;
A plurality of teeth scuffing portions made of an insulating material arranged between the axial end faces of the plurality of teeth and the stator winding to guide the bent shape of the stator winding;
A plurality of element arrangement holes provided in each of the plurality of tea scaffle portions;
A temperature detection element arranged in at least one of the plurality of element arrangement holes;
A rotating electrical machine.

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