Large Torque Control for Regenerative Operation of Induction Motor Speed Sensorless Vector Control

We developed a torque stabilization method for the regenerative operation of speed sensorless vector controlled induction motor (IM) drives. Speed sensorless vector control suffers from a torque reduction phenomenon in regenerative operation. Therefore, we analyzed the cause and developed two stabilization methods: one to stabilize the decrease in IM flux and the other to adjust the velocity command in the low-speed range. Time domain simulations and experiments demonstrate the effectiveness of the proposed method.