Loss Manipulation Capabilities of Deadbeat-Direct Torque and Flux Control Induction Machine Drives

This paper investigates the loss manipulation capabilities of deadbeat-direct torque and flux control (DB-DTFC) induction machine drives. For each switching period, a Volt.-sec.-based inverse model provides a range of Volt.-sec. solutions to achieve the desired torque at the end of each switching interval, while stator flux magnitude provides another degree-of-freedom to manipulate machine losses. With a flux-based DB-DTFC loss model, losses can be manipulated each switching period without compromising torque dynamics. For steady-state operation and typical process trajectories, the minimum loss can be achieved with corresponding energy savings. Alternatively, significant losses can be induced rapidly to dissipate kinetic energy in the machine during braking transients. This provides smooth braking torque and decreases deceleration time without requiring additional energy dissipation or storage hardware. DB-DTFC induction machine drives provide an effective and elegant solution for loss manipulation.