Motor, control method, power system, and electric vehicle

A motor, comprising:

• stator windings of M phases, wherein M is a positive integer, each phase stator winding comprises a first sub-winding set and a second sub-winding set, and the motor is used to heat a traction battery;
• and
• when the motor heats the traction battery so as to energize the first sub-winding set and the second sub-winding set, a direction of a total magnetic field generated by the first sub-winding set is caused to be opposite to a direction of a total magnetic field generated by the second sub-winding set,
• wherein the first sub-winding set comprises a first sub-winding, and the second sub-winding set comprises a second sub-winding;
• the first sub-winding comprises a head end and a tail end, and the second sub-winding comprises a head end and a tail end;
• when the motor heats the traction battery, the tail end of the first sub-winding is connected to the tail end of the second sub-winding;
• and
• wherein:
• the motor further comprises M sets of intra-phase switches, wherein each set of intra-phase switches comprises a first intra-phase switch and a second intra-phase switch;
• and
• the first intra-phase switch is connected between the tail end of the first sub-winding and the head end of the second sub-winding in one phase stator winding, and the second intra-phase switch is connected between the tail end of the first sub-winding and the tail end of the second sub-winding in the phase stator winding.