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EP-4044404-B1 - A CONCENTRATED WINDING AXIAL COOLING MOTOR STATOR AND MOTOR

EP4044404B1EP 4044404 B1EP4044404 B1EP 4044404B1EP-4044404-B1

Inventors

  • LIU, Yanhai
  • CHEN, Xuwen
  • LI, GUANGJU
  • ZHANG, DONGLIANG

Dates

Publication Date
20260506
Application Date
20210324

Claims (9)

  1. A concentrated winding axial cooling motor stator suitable to be arranged on a casing the stator comprising a stator core (4) and stator windings (2) arranged on the stator core (4), further comprising barriers and an axial oil feeding device (1), wherein, the barriers are arranged on the stator core (4), are in contact with the stator windings (2) and plug notches of the stator core (4); the axial oil feeding device (1) is arranged on any end part of the stator cores (4) or is connected with the casing, and a location of the axial oil feeding device (1) corresponds to any end of the stator cores (4); and a side of the axial oil feeding device (1) close to the stator windings (2) is provided with a spray hole (102), an axis of the spray hole (102) and an axis of each stator winding (2) are slantly intersected, so that an outflow line of a cooling medium is in a slant state and extends from the spray hole (102) towards an end of the axis of each stator winding (2), and the cooling medium is sprayed to the barrier and/or the stator winding (2) and thus flows along an axial inner surface of the stator winding (2) towards two ends of the stator winding (2); wherein each barrier and coils of two adjacent groups of the stator windings (2) in slots of the stator core (4) constitute a cooling medium communication cavity, the spray hole (102) corresponds to the cooling medium communication cavity, the barrier blocks off a cooling medium flowing out of the spray hole (102) and guides a flow line of the cooling medium, so that the cooling medium flows along the axial inner surface of the stator winding (2) in the two adjacent groups of the stator windings towards two ends of the stator winding (2).
  2. The concentrated winding axial cooling motor stator according to claim 1, wherein an axis of the spray hole (102) extends slantly from the spray hole (102) towards an end that away from an end, provided with the axial oil feeding device (1), of the stator winding (2).
  3. The concentrated winding axial cooling motor stator according to claim 1 or 2, wherein a plurality of spray holes (102) are provided, and each cooling medium communication cavity corresponds to a location of at least one of the spray holes (102); or, the plurality of spray holes (102) are configured in such a way that adjacent spray holes (102) are spaced apart by one cooling medium communication cavity; or, the plurality of spray holes (102) are configured in such a way that a portion of the spray holes (102) correspond to a portion of the cooling medium communication cavities, and adjacent spray holes (102) of the other portion of the spray holes (102) are spaced apart by one cooling medium communication cavity so that each coil of each stator winding (2) is sprayed by the cooling medium.
  4. The concentrated winding axial cooling motor stator according to claim 1 or 2, wherein the axial oil feeding device (1) further comprises: an oil pipe body (100) having a cavity provided therein, and the spray hole (102) being communicated with the cavity inside the oil pipe body (100) for facilitating flowing of the cooling medium; an oil inlet (101) connected with the oil pipe body (100) and communicated with the cavity inside the oil pipe body (100), so that the cooling medium is able to conveniently enter the inside of the oil pipe body (100).
  5. The concentrated winding axial cooling motor stator according to claim 4, wherein a cross section of the oil pipe body (100) is in a shape of a circle or a polygon.
  6. The concentrated winding axial cooling motor stator according to claim 5, wherein the oil pipe body (100) is of an annular structure, or a plurality of oil pipe bodies (100) are provided, and the plurality of oil pipe bodies (100) are annularly arranged by taking the axis of the stator winding (2) as a center.
  7. The concentrated winding axial cooling motor stator according to claim 1 or 2, wherein the barrier has a flow guide portion (300), and the flow guide portion (300) is opposite to the spray hole (102) for changing a flow direction of the cooling medium.
  8. The concentrated winding axial cooling motor stator according to 7, wherein the barrier is a slot wedge (3), a frame (8) or insulating paper.
  9. A concentrated winding motor, comprising the concentrated winding axial cooling motor stator according to any one of claims 1 to 8.

Description

The present invention is a national stage application of International Patent Application No. PCT/CN2021/082826, which is filed on March 24, 2021 and claims the priority of a Chinese patent application No. 202010518076.9 filed with the China National Intellectual Property Administration (CNIPA) on June 9, 2020, entitled "a concentrated winding axial cooling motor stator and a motor". Technical Field The present invention belongs to the technical field of motors, in particular relates to a concentrated winding axial cooling motor stator and a motor. Background In recent years, as new energy vehicles boom, major automobile and parts manufacturers have been devoted to search and development of new energy vehicles and supporting facilities thereof that can meet market requirements. As one of the core parts, a motor has been integrated with a gearbox or a controller into a whole. With a rising requirement on power density, no matter the motor serves as a part of an integrity or works alone, its heat dissipation problem becomes important. Therefore, the requirement on a cooling mode is higher. However, in a working process of the motor, its main heating component refers to motor stator coils, a rotating magnetic field is generated when an AC/BC passes through the coils, and interacts with a magnetic field of a rotor to generate an electromagnetic torque, so that the motor rotates. A current when passing through stator coils, has energy loss under the effect of a resistance, and the lost energy is mainly transformed into heat. Therefore, how to well control temperature rise of the stator coils becomes very important. At present, oil cooled motors of the same kind mainly depend on oil cooling at an end part of a stator and a middle part of a stator core and oil shredding of the rotor towards end parts of two sides of the stator to achieve heat dissipation. These similar solutions are more suitable for distributed winding stators, which however have limitations to heat dissipation of concentrated winding stators with shorter end parts, dispersive end part structures and larger pores. An oil cooling structure for a motor is disclosed in D1 (WO2020/105467A1). Summary The invention is defined by the appended claims. In view of the above problems, the present invention provides a concentrated winding axial cooling motor stator and a motor so as to resolve the above-mentioned or other previous problems in a prior art. To resolve the above technical problems, the present invention adopts the following technical solution: a concentrated winding axial cooling motor stator is arranged on a casing, includes a stator core and stator windings arranged on the stator core, and further includes barriers and an axial oil feeding device, wherein, the barriers are arranged on the stator core, are in contact with the stator windings and plug notches of the stator core;the axial oil feeding device is arranged on any end part of the stator cores or is connected with the casing, and a location of the axial oil feeding device corresponds to any end of the stator cores;and a side of the axial oil feeding device close to the stator windings is provided with a spray hole, an axis of the spray hole and an axis of each stator winding are slantly intersected, so that an outflow line of a cooling medium is in a slant state and extends from the spray hole towards an end of the axis of the each stator winding, and the cooling medium is sprayed to the barrier and/or the stator winding and thus flows along an axial inner surface of the stator winding towards two ends of the stator winding. In some embodiments, each barrier and coils of two adjacent groups of the stator windings in slots of the stator core constitute a cooling medium communication cavity, the spray hole corresponds to the cooling medium communication cavity, the barrier blocks off a cooling medium flowing out of the spray hole and guides a flow line of the cooling medium, so that the cooling medium flows along the axial inner surface of the stator winding in the two adjacent groups of the stator windings towards two ends of the stator winding. In some embodiments, an axis of the spray hole extends slantly from the spray hole towards an end away from the stator winding and provided with the axial oil feeding device. In some embodiments, a plurality of spray holes are provided, and each cooling medium communication cavity corresponds to a location of at least one of the spray holes; or, the plurality of spray holes are configured in such a way that adjacent spray holes are spaced apart by one cooling medium communication cavity;or, the plurality of spray holes are configured in such a way that a portion of the spray holes correspond to a portion of the cooling medium communication cavities, and adjacent spray holes of the other portion of the spray holes are spaced apart by one cooling medium communication cavity so that each coil of each stator winding is sprayed by the cooling medium