Axial motor, powertrain, and electric device

An axial motor, comprising:

• a motor shaft;
• and
• an axial motor stator comprising:
• an inner shaft sleeve sleeving the axial motor stator on the motor shaft and comprising a first inner shaft end surface and two inner shaft sleeve ends along an axial direction of the inner shaft sleeve;
• two fastening plates sleeved on the inner shaft sleeve and comprising:
• a plurality of magnetic core accommodating holes that penetrate through the two fastening plates and comprise hole walls;
• inner circumferential parts sealed and fastened to the two inner shaft sleeve ends;
• and
• outer circumferential parts;
• an outer housing comprising two outer housing ends along an axial direction of the outer housing;
• and
• a plurality of magnetic cores sequentially spaced apart around the inner shaft sleeve, wherein each of the plurality of magnetic cores comprises:
• two magnetic core ends that respectively penetrate through the magnetic core accommodating holes and are respectively sealed and fastened to the hole walls;
• a magnetic core winding part comprising a first winding end and a first winding end surface, wherein the first winding end surface comprises a first portion and a second portion;
• and
• a magnetic core end part located at the first winding end along an axial direction of the inner shaft sleeve, wherein the magnetic core end part comprises:
• a magnetic core connection part arranged along the axial direction of the inner shaft sleeve and comprising a first core connection end surface;
• and
• a magnetic core sub-end part arranged along the axial direction of the inner shaft sleeve, wherein the magnetic core connection part is located between the magnetic core sub-end part and the magnetic core winding part, wherein the magnetic core sub-end part covers a part of the first core connection end surface, and wherein a portion of the first core connection end surface that is not covered by the magnetic core sub-end part forms a secondary step surface,
• wherein the magnetic core end part covers the first portion, wherein the second portion is the first winding end surface that is not covered by the magnetic core end part, wherein the second portion is an axial protraction relative to the first winding end surface covered by the magnetic core and forms a step surface relative to the first portion, and wherein the step surface is provided around the magnetic core end part such that a first cross-sectional area of the first portion is larger than a second cross-sectional area of the second portion,
• wherein the two outer housing ends are respectively sealed and fastened to the outer circumferential parts such that a sealing cavity is formed between the two fastening plates, the inner shaft sleeve, the outer housing, and the plurality of magnetic cores,
• wherein each of the two fastening plates further comprise an accommodating groove that is concave relative to the first inner shaft end surface, wherein the axial motor stator further comprises a plurality of pole shoes located in the accommodating groove, wherein each pole shoe of the plurality of pole shoes is located on a circumferential side of the magnetic core end part of one of the plurality of magnetic cores, wherein two adjacent pole shoes are spaced apart, and wherein a pole shoe of the plurality of pole shoes is connected to at least a part of the secondary step surface and to at least a part of a groove bottom of the accommodating groove.

A powertrain, comprising:

• a gearbox comprising a power input shaft;
• and
• an axial motor configured to be drive-connected to the power input shaft and configured to output power to the power input shaft, wherein the axial motor comprises:
• a motor shaft;
• an axial motor stator comprising:
• an inner shaft sleeve sleeving the axial motor stator to the motor shaft and comprising:
• two inner shaft sleeve ends along an axial direction of the inner shaft sleeve;
• and
• a first inner shaft end surface;
• two fastening plates sleeved on the inner shaft sleeve and comprising:
• a plurality of magnetic core accommodating holes that penetrate through each of the two fastening plates;
• inner circumferential parts sealed and fastened to the two inner shaft sleeve ends;
• and
• outer circumferential parts;
• an outer housing comprising two outer housing ends along an axial direction of the outer housing;
• a plurality of magnetic cores sequentially spaced apart around the inner shaft sleeve and comprising two magnetic core ends that respectively penetrate through magnetic core accommodating holes of the two fastening plates, and are respectively sealed and fastened to hole walls of the magnetic core accommodating holes, wherein each magnetic core further comprises:
• a magnetic core winding part comprising a first winding end and a first winding end surface, wherein the first winding end surface comprises a first portion and a second portion;
• and
• a magnetic core end part located at the first winding end along an axial direction of the inner shaft sleeve, wherein the magnetic core end part comprises:
• a magnetic core connection part arranged along the axial direction of the inner shaft sleeve and comprising a first core connection end surface;
• and
• a magnetic core sub-end part arranged along the axial direction of the inner shaft sleeve, wherein the magnetic core connection part is located between the magnetic core sub-end part and the magnetic core winding part, wherein the magnetic core sub-end part covers a part of the first core connection end surface, wherein a portion of the first core connection end surface that is not covered by the magnetic core sub-end part forms a secondary step surface,
• wherein the magnetic core end part covers the first portion, wherein second portion is the first winding end surface that is not covered by the magnetic core end part, wherein the second portion is an axial protraction relative to the first winding end surface covered by the magnetic core and forms a step surface relative to the first portion, and wherein the step surface is provided around the magnetic core end part such that a first cross-sectional area of the first portion is larger than a second cross-sectional area of the second portion,
• wherein the two outer housing ends are respectively sealed and fastened to the outer circumferential parts such that a sealing cavity is formed between the two fastening plates, the inner shaft sleeve, the outer housing, and the plurality of magnetic cores,
• wherein each of the two fastening plates further comprise an accommodating groove that is concave relative to the first inner shaft end surface, wherein the axial motor stator further comprises a plurality of pole shoes located in the accommodating groove, wherein each pole shoe of the plurality of pole shoes is located on a circumferential side of the magnetic core end part of one of the plurality of magnetic cores, wherein two adjacent pole shoes are spaced apart, and wherein a pole shoe of the plurality of pole shoes is connected to at least a part of the secondary step surface and to at least a part of a groove bottom of the accommodating groove.