Control for high instantaneous torque from induction machines: Methods and limits

This paper evaluates maximum instantaneous torque capabilities of induction machines, and analyzes field-oriented control and related control strategies that can deliver high momentary forces. The analyses show that by using the entire voltage headroom, in principle up to 300% of the breakdown torque can be obtained at stall without saturating the magnetic circuit. An augmented vectorized volts-per-hertz control strategy is proposed and two different synthesis approaches are presented. The augmentation schemes can generate high instantaneous torques comparable to vector controllers.