A motor control unit, comprising a control unit and at least two drive circuits: a first drive circuit and a second drive circuit, wherein a type of a power component in the first drive circuit is different from a type of a power component in the second drive circuit, a loss of the power component in the first drive circuit is greater than a loss of the power component in the second drive circuit, and a current withstand capability of the power component in the first drive circuit is greater than a current withstand capability of the power component in the second drive circuit; the first drive circuit is configured to invert a direct current output by a corresponding direct current power supply into an alternating current, and supply the alternating current to a first part of windings of a motor; the second drive circuit is configured to invert a direct current output by a corresponding direct current power supply into an alternating current, and supply the alternating current to a second part of windings of the motor; and the control unit is configured to, when determining that a load of the motor is less than a preset load, control the first drive circuit to stop working and control the second drive circuit to work; characterised in that the control unit is configured to, when determining that the load of the motor is greater than or equal to the preset load, control both the first drive circuit and the second drive circuit to work; wherein the motor control unit further comprises a first filter capacitor and a second filter capacitor, wherein two ends of the first filter capacitor are connected to an input end of the first drive circuit; two ends of the second filter capacitor are connected to an input end of the second drive circuit; and the first filter capacitor and the second filter capacitor correspond to different direct current power supplies; wherein the control unit is further configured to send a first group of drive signals to the power component of the first drive circuit, and send a second group of drive signals to the power component of the second drive circuit, wherein an angle range of a phase difference between the first group of drive signals and the second group of drive signals is 0 to 180 degrees. a type of a power component in the first drive circuit is different from a type of a power component in the second drive circuit, a loss of the power component in the first drive circuit is greater than a loss of the power component in the second drive circuit, and a current withstand capability of the power component in the first drive circuit is greater than a current withstand capability of the power component in the second drive circuit; the first drive circuit is configured to invert a direct current output by a corresponding direct current power supply into an alternating current, and supply the alternating current to a first part of windings of a motor; the second drive circuit is configured to invert a direct current output by a corresponding direct current power supply into an alternating current, and supply the alternating current to a second part of windings of the motor; and the control unit is configured to, when determining that a load of the motor is less than a preset load, control the first drive circuit to stop working and control the second drive circuit to work; characterised in that the control unit is configured to, when determining that the load of the motor is greater than or equal to the preset load, control both the first drive circuit and the second drive circuit to work; wherein the motor control unit further comprises a first filter capacitor and a second filter capacitor, wherein two ends of the first filter capacitor are connected to an input end of the first drive circuit; two ends of the second filter capacitor are connected to an input end of the second drive circuit; and the first filter capacitor and the second filter capacitor correspond to different direct current power supplies; wherein the control unit is further configured to send a first group of drive signals to the power component of the first drive circuit, and send a second group of drive signals to the power component of the second drive circuit, wherein an angle range of a phase difference between the first group of drive signals and the second group of drive signals is 0 to 180 degrees.