A three-phase, 380 V (line-to-line), 50 Hz, 1450 rpm, Y-connected cage induction motor is fed from a three-phase inverter. The maximum input frequency cannot exceed 50 Hz and the maximum to minimum required speed ratio is 10:1. The inverter DC input voltage is supplied from a fully controlled three-phase rectifier with three 380 V input. Find the maximum and minimum DC link voltage and corresponding firing angles of the rectifier.
