| Abstract |
Novel induction motor speed sensorless torque control
optimizing both torque response and efficiency is proposed. The
control is quite different than the conventional field-oriented or
direct torque control [1]. First, the produced torque is explicitly
continuous output variable of control. Second, a new rotor flux
observer, which allows speed sensorless operation of IM by low
and zero speed, was developed. A new stator and rotor flux
controller/observer based on continuous sliding mode and
Lyapunov theory are developed. The proposed robust control
scheme allows a smooth transition into the field weakening region
and the full utilization of the inverter current and voltage
capability during acceleration or regenerative braking of EV. The
drive system including an 18 kW, 4 pole, 120 V battery-powered
IM and a 30 kW IGBT inverter has been applied to a pick up truck
(EV). |
