Methods, systems and apparatus for dynamically controlling an electric motor that drives an oil pump

A motor drive system, comprising:

• an oil pump;
• a pulse width modulated (PWM) inverter module designed to receive switching vector signals and designed to generate three-phase voltage signals;
• an electric motor designed to drive the oil pump, the electric motor comprising motor windings each being coupled to the PWM inverter module to receive the three-phase voltage signals that drive a rotor of the electric motor at varying angular velocities, the electric motor being designed to generate three-phase stator currents at the motor windings;
• a motor current measurement module, coupled to the motor windings of the electric motor, and designed to measure the three-phase stator currents;
• a transmission control module designed to generate a measured oil temperature;
• and
• a controller, coupled to the PWM inverter module, and designed to generate the switching vector signals that drive the PWM inverter module, the controller comprising:
• a motor temperature estimator module designed to receive the measured oil temperature and the measured three-phase stator currents, and to generate an estimated motor temperature;
• and
• a position and speed estimator module designed to generate an estimated rotor angular position output;
• a low-pass filter designed to generate a filtered rotor angular velocity signal;
• a speed controller module designed to generate a motor torque command signal;
• and
• a current regulated vector control module designed to generate the switching vector signals based on the motor torque command signal, the three-phase stator currents measured from the electric motor, the filtered rotor angular velocity signal, the estimated motor temperature and the estimated rotor angular position output.