Motor control system

Abstract

This invention discloses an electric motor control system, which includes an electric motor and a control device for controlling the electric motor. The electric motor includes a rotor having a rotor core, a stator having a stator core arranged radially apart from the outer peripheral surface of the rotor core by an air gap, and an electric motor housing housing them. The electric motor control system also includes a cooling device for supplying oil to the electric motor, a pump for pumping oil accumulated at the bottom of the electric motor housing, and a temperature sensor for detecting the temperature of the stator coils. The temperature sensor is installed at the end of the stator coils at a portion lower than the lowest end of the air gap. The control device is configured to increase the pumping force when the temperature detected by the temperature sensor exceeds a predetermined upper limit temperature, so that the oil level at the bottom of the electric motor housing does not exceed the lowest end of the air gap.

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