Motor controller, electric drive system, and vehicle

An electric drive system, wherein the electric drive system comprises a motor controller and a motor, the motor receives a three-phase alternating current from an inverter circuit, wherein the motor controller comprises an inverter circuit and a control circuit, the inverter circuit comprises three switching transistor bridge arms, two ends of each of the three switching transistor bridge arms are configured to receive power supplied by a power battery, a midpoint of each of the three switching transistor bridge arms is configured to connect to a one-phase winding of three-phase windings of a motor, and the control circuit is configured to:

• control, in response to that an absolute value of a torque requirement indicated by a torque signal is greater than or equal to a preset torque value, the inverter circuit to output a three-phase alternating current;
• and
• control, in response to that a rotation speed of the motor is less than a first rotation speed value or greater than a second rotation speed value and that the absolute value of the torque requirement indicated by the torque signal is less than the preset torque value, a plurality of switching transistors in the inverter circuit to be cut off, wherein
• the second rotation speed value is greater than the first rotation speed value.

A vehicle, comprising a power battery and an electric drive system, wherein the power battery is connected to an input end of an inverter circuit, the electric drive system comprises a motor controller and a motor, the motor receives a three-phase alternating current from an inverter circuit, the motor controller comprises an inverter circuit and a control circuit, the inverter circuit comprises three switching transistor bridge arms, two ends of each switching transistor bridge arm are configured to receive power supplied by a power battery, a midpoint of each switching transistor bridge arm is configured to connect to a one-phase winding of three-phase windings of a motor, and the control circuit is configured to:

• control, in response to that an absolute value of a torque requirement indicated by a torque signal is greater than or equal to a preset torque value, the inverter circuit to output a three-phase alternating current;
• and
• control, in response to that a rotation speed of the motor is less than a first rotation speed value or greater than a second rotation speed value and that the absolute value of the torque requirement indicated by the torque signal is less than the preset torque value, a plurality of switching transistors in the inverter circuit to be cut off, wherein
• the second rotation speed value is greater than the first rotation speed value.