PWM-CSI INDUCTION-MOTOR DRIVE WITH PHASE-ANGLE CONTROL

This paper describes a pulse-width-modulated current-source inverter drive system using an induction motor. Its dominant feature is that it provides adequate control of either torque or speed over a wide range without requiring a shaft position or speed sensor. The drive is simple to implement, rugged, and sufficient for many controlled drive applications. The control strategy is based on the concept of controlling the stator phase angle of the induction motor. The stator voltage is sensed, and the current-source inverter is used to inject current into the motor with the desired phase angle.