JP2015130719A - Cooling structure of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a coil wound around a stator core in a distributed winding manner at a motor where a cuff support member is provided on an axial end surface of the stator core.SOLUTION: When a cooling oil is supplied to a radial outer peripheral surface of a stator core 40, a part of the cooling oil supplied to the radial outer peripheral surface of the stator core 40 flows into multiple guide grooves 54 of a cuff support member 50a. Each guide groove 54 is formed so that the cooling oil is led from the stator core 40 side to the coil ends 60a, 60b side. Thus, coil ends 60a, 60b are directly cooled by the cooling oil flowing into the guide grooves 54. The structure effectively can cool a coil 62.

Description

  The present invention relates to a cooling structure for a motor, and more specifically, a stator core, an annular member installed on an end surface in the axial direction of the stator core, and a coil formed so as to protrude outward in the axial direction of the annular member. The present invention relates to a motor cooling structure that cools a motor by supplying a refrigerant to an outer peripheral surface in a radial direction of a stator core of a motor including a coil having an end and distributedly wound around the stator core.

  Conventionally, as this type of motor cooling structure, there has been proposed a cooling structure that cools the stator core and the coil by injecting cooling oil toward the outer cylinder ring of the motor in which the stator core and the coil are housed in the outer cylinder ring. (For example, refer to Patent Document 1). In this motor cooling structure, the outer cylinder ring and the coil end are cooled well by injecting cooling oil toward the outer cylinder ring in a certain angle range and spraying a part of the cooling oil onto the surface of the coil end. ing.

JP 2012-222904 A

  In order to avoid contact between the stator core and the coil end as well as the motor cooling structure described above, an annular member installed on the axial end surface of the stator core and a coil end on the outer side of the annular member in the axial direction are provided. Even in a cooling structure for cooling a motor including a coil formed so as to protrude, it is necessary to cool the coil well. In such a cooling structure for cooling a motor including an annular member, when a coolant such as cooling oil is supplied to the outer peripheral surface in the radial direction of the stator core to cool the motor, a part of the supplied refrigerant is reduced in diameter of the annular member. Since it flows on the outer peripheral surface in the direction and drops without reaching the coil end, the coil may not be cooled well.

  In the motor cooling structure according to the present invention, in a motor in which an annular member is provided on the end face in the axial direction of the stator core, the main purpose is to satisfactorily cool the coils wound around the stator core.

  The motor cooling structure of the present invention employs the following means in order to achieve the above-mentioned main object.

The motor cooling structure of the present invention is:
A stator core; an annular member installed on an end surface in the axial direction of the stator core; and a coil end formed so as to protrude outward in the axial direction of the annular member; A cooling structure for the motor that cools the motor by supplying a coolant to the outer circumferential surface in the radial direction of the stator core of the motor comprising a coil,
The annular member is characterized in that a guide groove for guiding the refrigerant from the stator core side to the coil end side is formed on the outer peripheral surface in the radial direction.

  In the motor cooling structure of the present invention, when the refrigerant is supplied to the outer surface of the stator core, a part of the refrigerant supplied to the outer peripheral surface in the radial direction of the stator core flows into the guide groove of the annular member. Since the guide groove is formed to guide the refrigerant from the stator core side to the coil end side, the refrigerant flowing into the guide groove flows from the stator core to the coil end and directly cools the coil end. Since the coil end is directly cooled by the refrigerant, the coil can be satisfactorily cooled.

1 is a configuration diagram showing an outline of a motor cooling device 20 that cools motors MG1 and MG2 as one embodiment of the present invention mounted on a vehicle 10. FIG. It is explanatory drawing which shows the outline of a structure of motor MG1. It is explanatory drawing which shows the outline of the cross section of motor MG1. It is explanatory drawing which shows the outline of a structure of the cuff member 50a.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a motor cooling device 20 that cools motors MG1 and MG2 mounted on a vehicle 10 as an embodiment of the present invention. The vehicle 10 includes, for example, an engine (not shown), a motor MG1 that is housed in a case 22 in which cooling oil (ATF) is stored as a refrigerant at the bottom, and that generates power using power from the engine, and an axle (not shown) that is housed in the case 22. The hybrid vehicle includes a motor MG2 capable of inputting / outputting power to / from the connected drive shaft, and a motor cooling device 20 for cooling the motors MG1, MG2 housed in the case 22.

  The motor cooling device 20 includes a flow path 20 a that connects an oil discharge port 22 a provided at the bottom of the case 22 and oil supply ports 22 b and 22 c provided at the top of the case 22, and an oil attached to the flow path 20 a. And a pump 24. The motor cooling device 20 pumps the cooling oil discharged from the oil discharge port 22a stored at the bottom of the case 22 to the oil supply ports 22b and 22c by the oil pump 24, to the outer peripheral surface in the radial direction of the motors MG1 and MG2. The motors MG1 and MG2 are cooled by supplying them.

  FIG. 2 is an explanatory diagram showing an outline of the configuration of the motor MG1, and FIG. 3 is an explanatory diagram showing an outline of a cross section of the motor MG1. Note that FIG. 2 is a view of the motor MG1 as viewed from the upper surface, and the bold arrow in the drawing represents the flow of cooling oil. The motor MG1 is configured as an integral core in which a plurality of (for example, several tens of sheets) annular magnetic steel sheets formed by punching a non-oriented electrical steel sheet are stacked, and a plurality of shapes (in a shape protruding inward on the inner peripheral surface). (E.g., 12 pieces) a stator core 40 having a tooth portion (not shown), annular cuff members (annular members) 50a, 50b installed on both axial end surfaces of the stator core 40, and an inner peripheral side of the stator core 40 And a coil 62 having coil ends 60a and 60b that are formed by windings that are wound around the plurality of formed tooth portions by distributed winding or the like and protrude outward in the axial direction of the stator core 40. Note that the motor MG2 has the same configuration as the motor MG1, and thus the description thereof is omitted.

  FIG. 4 is an explanatory diagram showing an outline of the configuration of the cuff member 50a. Since the cuff member 50b has the same configuration as the cuff member 50a, the description thereof is omitted. The cuff member 50a is formed of a resin having a higher insulation and lower thermal conductivity than a metal such as copper, and has an inner peripheral surface on the teeth portion of the stator core 40 having the same shape as the end surface of the stator core 40. A plurality of support portions 52 formed at a predetermined height so as to be arranged, and extending in the axial direction on the outer peripheral surface in the radial direction to guide the cooling oil from the stator core 40 side to the coil ends 60a, 60b side. A guide groove 54 is formed. The cuff members 50a and 50b suppress the contact between the end surface of the stator core 40 and the coil ends 60a and 60b by the support 52, so that the end of the stator core 40 and the coil 62 come into contact with each other when the coil 62 is wound. This prevents the coil 62 from being damaged and the stator core 40 and the coil 62 from being short-circuited.

  In the motor cooling device 20 of the motors MG1 and MG2 configured as described above, the cooling oil is supplied from the oil supply port 22b at the top of the case 22 to the outer peripheral surface in the radial direction of the stator core 40 by the motor cooling device 20, thereby Cooling. A part of the cooling oil supplied to the outer peripheral surface in the radial direction of the stator core 40 flows into the guide grooves 54 of the cuff members 50a and 50b. Since the guide groove 54 is formed from the stator core 40 side toward the coil ends 60a and 60b, the cooling oil flowing into the guide groove 54 flows from the stator core 40 to the coil ends 60a and 60b and passes through the coil ends 60a and 60b. Cool directly. Thus, since the coil ends 60a and 60b are directly cooled by the cooling oil, the coil 62 can be cooled satisfactorily.

  According to the motor cooling device 20 of the embodiment described above, the cooling oil is supplied to the outer peripheral surface in the radial direction of the stator core 40 from the oil supply port 22b at the upper part of the case 22, so that the outer peripheral surface in the radial direction of the stator core 40 is supplied. A part of the supplied cooling oil flows into the guide groove 54 of the cuff member 50a, 50b formed so as to go from the stator core 40 side toward the coil end 60a, 60b side, and the coil end 60a directly by the cooling oil flowing into the guide groove 54. 60b is cooled, the coil 62 can be cooled well.

  In the motor cooling device 20 of the embodiment, the cuff members 50a and 50b are arranged on both end faces of the stator core 40. However, it is assumed that one of the cuff members 50a and 50b is not installed, and only one end face of the stator core 40 is cuffed. It is good also as what arranges a member.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the stator core 40 corresponds to a “stator core”, the cuff member 50 a corresponds to a “cuff member”, and the coil 62 corresponds to a “coil”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention is applicable to the manufacturing industry of motor cooling structures.

  DESCRIPTION OF SYMBOLS 10 Vehicle, 20 Motor cooling structure, 20a Flow path, 22 Case, 22a Oil discharge port, 22b Oil supply port, 24 Oil pump, 40 Stator core, 50a, 50b Cuff member (annular member), 52 Support part, 54 Guide groove 60a, 60b coil end, 62 coils, MG1, MG2 motor.

Claims (1)

A stator core; an annular member installed on an end surface in the axial direction of the stator core; and a coil end formed so as to protrude outward in the axial direction of the annular member; A cooling structure for the motor that cools the motor by supplying a coolant to the outer circumferential surface in the radial direction of the stator core of the motor comprising a coil,
The annular member has a guide groove formed on a radially outer peripheral surface for guiding the refrigerant from the stator core side to the coil end side. Motor cooling structure.

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