Radial flux motor, powertrain, and vehicle

1 . A radial flux motor comprising:

a rotor comprising a plurality of magnetic steel slots and a plurality of magnetic steels; and

a motor shaft, wherein the rotor is sleeved on the motor shaft,

each magnetic steel slot of the plurality of magnetic steel slots penetrates through the rotor,

each magnetic steel slot is configured to accommodate one or more magnetic steels of the plurality of magnetic steels,

a surface of at least one magnetic steel that is spaced from a slot wall of the magnetic steel slot comprises a plurality of primary grooves,

at least one adjacent side face of a side face on which the plurality of primary grooves is located comprises a plurality of secondary grooves, and

the plurality of primary grooves is sequentially arranged at intervals in a length direction of the plurality of magnetic steels.

2 . The radial flux motor according to claim 1 , wherein a surface of each magnetic steel comprises a plurality of side faces, at least one of the plurality of side faces is spaced from the slot wall of each magnetic steel slot, and the at least one side face comprises the plurality of primary grooves.

3 . The radial flux motor according to claim 1 , wherein a cross-sectional shape of the at least one magnetic steel in a direction perpendicular to the length direction of each magnetic steel is a rectangle, side faces corresponding to two short edges of the rectangle are spaced from the slot wall of each magnetic steel slot, and the side faces corresponding to the two short edges of the rectangle comprise the plurality of primary grooves.

4 . The radial flux motor according to claim 1 , wherein included angles between extension directions of the plurality of primary grooves and the length direction of each magnetic steel comprise one or more angle values, and the one or more angle values comprise at least one of 90 degrees and a value less than 90 degrees.

5 . The radial flux motor according to claim 1 , wherein at least one of groove spacings between the plurality of primary grooves or groove depths of the plurality of primary grooves comprises at least two values, the groove spacing is a distance between two adjacent primary grooves, and the groove depth is a distance between a groove opening and a groove bottom of the plurality of primary grooves.

6 . The radial flux motor according to claim 1 , wherein, in the length direction of each magnetic the magnetic steel, a distance between any primary groove and any end of each magnetic steel is greater than or equal to ⅙ of a length of each magnetic the magnetic steel.

7 . The radial flux motor according to claim 1 , wherein a largest depth of the plurality of primary grooves is greater than or equal to 1/10 of a width of each magnetic steel in a depth direction of the plurality of primary grooves, and the largest depth of the plurality of primary grooves is less than or equal to ⅓ of the width of each magnetic steel in the depth direction of the plurality of primary grooves.

8 . The radial flux motor according to claim 1 , wherein, in the length direction of each magnetic steel, the depths of the plurality of primary grooves are first increased and then decreased; and/or

in the length direction of each magnetic steel, spacings between two adjacent grooves in the plurality of primary grooves are first decreased and then increased.

9 . The radial flux motor according to claim 1 , wherein a value of a width of each primary groove in the length direction of each magnetic steel is greater than or equal to 0.01 millimeter, and is less than or equal to 1 millimeter.

10 . The radial flux motor according to claim 1 , wherein at least one secondary groove of the plurality of secondary grooves communicates with one primary groove of the plurality of primary grooves.

11 . The radial flux motor according to claim 10 , wherein at least one of groove spacings between the plurality of secondary grooves or groove depths of the plurality of secondary grooves comprises at least two values, the groove spacing between the plurality of secondary grooves is a distance between two adjacent secondary grooves of the plurality of secondary grooves, and the groove depth of the plurality of secondary grooves is a distance between a groove opening and a groove bottom of each secondary groove of the plurality of secondary grooves.

12 . The radial flux motor according to claim 10 , wherein an angle value of an included angle between an extension direction of one or more consecutive secondary grooves in the plurality of secondary grooves and the length direction of each magnetic steel is 90 degrees, and an angle value of an included angle between an extension direction of one or more other consecutive secondary grooves in the plurality of secondary grooves and the length direction of each magnetic steel is less than 90 degrees.

13 . The radial flux motor according to claim 10 , wherein two magnetic steel slots are axially symmetrical in a radial direction of the rotor, quantities of magnetic steels in the two magnetic steel slots are the same,

quantities of a plurality of primary grooves on the magnetic steels in the two magnetic steel slots are the same, groove spacings between the plurality of primary grooves on the magnetic steels in the two magnetic steel slots are the same, and groove depths of the plurality of primary grooves on the magnetic steels in the two magnetic steel slots are the same, and quantities of a plurality of secondary grooves on the magnetic steels in the two magnetic steel slots and groove spacings between the plurality of secondary grooves on the magnetic steels in the two magnetic steel slots are the same.

14 . The radial flux motor according to claim 1 , wherein a surface of the at least one magnetic steel that is in contact with the slot wall of the magnetic steel slot comprises a plurality of secondary grooves, and the plurality of secondary grooves is sequentially arranged at intervals in the length direction of the at least one magnetic steel.

15 . The radial flux motor according to claim 14 , wherein each magnetic steel slot comprises a plurality of magnetic steels that is sequentially arranged adjacent to each other, and at least one primary groove on one of two adjacent magnetic steels communicates with at least one primary groove on the other magnetic steel.

16 . A powertrain comprising:

a gearbox comprising a power input shaft; and

a radial flux motor comprising:

a rotor comprising a plurality of magnetic steel slots and a plurality of magnetic steels; and

a motor shaft, wherein the rotor is sleeved on the motor shaft,

each magnetic steel slot of the plurality of magnetic steel slots penetrates through the rotor,

each magnetic steel slot is configured to accommodate one or more magnetic steels of the plurality of magnetic steels,

a surface of at least one magnetic steel that is spaced from a slot wall of the magnetic steel slot comprises a plurality of primary grooves,

at least one adjacent side face of a side face on which the plurality of primary grooves is located comprises a plurality of secondary grooves, and

the plurality of primary grooves is sequentially arranged at intervals in a length direction of the plurality of magnetic steels; and

a motor shaft of the radial flux motor transmits power to the power input shaft.

17 . The powertrain according to claim 16 , wherein a surface of the magnetic steel comprises a plurality of side faces, at least one of the plurality of side faces is spaced from the slot wall of each magnetic steel slot, and the at least one side face comprises the plurality of primary grooves.

18 . The powertrain according to claim 16 , wherein a cross-sectional shape of the at least one magnetic steel in a direction perpendicular to the length direction of the at least one magnetic steel is a rectangle, side faces corresponding to two short edges of the rectangle are spaced from the slot wall of the magnetic steel slot, and the side faces corresponding to the two short edges of the rectangle comprise the plurality of primary grooves.

19 . The powertrain according to claim 16 , wherein included angles between extension directions of the plurality of primary grooves and the length direction of each magnetic steel comprise one or more angle values, and the one or more angle values comprise at least one of 90 degrees and a value less than 90 degrees.

20 . A vehicle comprising:

a frame; and

a powertrain comprising:

a gearbox comprising a power input shaft; and

a radial flux motor comprising:

a rotor comprising a plurality of magnetic steel slots and a plurality of magnetic steels; and

a motor shaft, wherein the rotor is sleeved on the motor shaft,

each magnetic steel slot of the plurality of magnetic steel slots penetrates through the rotor,

each magnetic steel slot is configured to accommodate one or more magnetic steels of the plurality of magnetic steels,

a surface of at least one magnetic steel that is spaced from a slot wall of the magnetic steel slot comprises a plurality of primary grooves,

at least one adjacent side face of a side face on which the plurality of primary grooves is located comprises a plurality of secondary grooves, and

the plurality of primary grooves is sequentially arranged at intervals in a length direction of the plurality of magnetic steels;

a motor shaft of the radial flux motor transmits power to the power input shaft; and

the powertrain is mounted on the frame, and a motor shaft of the radial flux motor drives the vehicle through the power input shaft.