A new slip power recovery scheme with improved supply power factor

A new slip power recovery scheme with a PWM converter in the rotor circuit is investigated. The steady state performance characteristics such as speed-torque characteristics, overall power factor of the drive system are determined using simple dc and ac equivalent circuits. Also, the performance characteristics are verified experimentally. There is a good agreement between theoretical and experimental results. The power factor of the drive system is improved significantly over the entire range of speed control. The drive provides speed-torque characteristics which are similar to those of a separately excited dc motor. Oscillograms of typical waveforms from the experimental set-up are illustrated to demonstrate the satisfactory working of the new slip power recovery scheme.