Abstract: An annular silicon steel sheet, a circular wire motor assembly, a circular wire motor, and a powertrain. The annular silicon steel sheet includes a plurality of open slots, each open slot penetrates the silicon steel sheet in an axial direction of the silicon steel sheet, and a projection of each open slot in the axial direction of the silicon steel sheet includes a first curve segment, a second curve segment, and a third curve segment. The first curve segment and the third curve segment are oppositely arranged in a circumferential direction of the silicon steel sheet, a bending direction of the first curve segment is away from a bending direction of the third curve segment, and a bending direction of the second curve segment is away from an opening of the open slot. The open slots improve the performance of the circular wire motor and the powertrain.

Abstract: A flat wire motor with a directly cooled flat wire winding, a powertrain, and an electric vehicle. Each winding groove of the flat wire motor is configured to accommodate a plurality of flat wires. The plurality of flat wires include a first flat wire. One radial groove wall of the winding groove and the first flat wire are arranged adjacently in the radial direction of the motor, and a gap between the one radial groove wall and the first flat wire is used as a first cooling groove. The first cooling groove is configured to transmit coolant to directly cool the first flat wire The first cooling groove can cool and fasten the first flat wire that helps improve cooling efficiency of the flat wire winding.

Abstract: An annular silicon steel sheet, a circular wire motor assembly, a circular wire motor, and a powertrain. The annular silicon steel sheet includes a plurality of open slots, each open slot penetrates the silicon steel sheet in an axial direction of the silicon steel sheet, and a projection of each open slot in the axial direction of the silicon steel sheet includes a first curve segment, a second curve segment, and a third curve segment. The first curve segment and the third curve segment are oppositely arranged in a circumferential direction of the silicon steel sheet, a bending direction of the first curve segment is away from a bending direction of the third curve segment, and a bending direction of the second curve segment is away from an opening of the open slot. The open slots improve the performance of the circular wire motor and the powertrain.