Dynamic Loss Minimizing Control of a Permanent Magnet Servomotor Operating Even at the Voltage Limit When Using Deadbeat-Direct Torque and Flux Control

Energy consumption and efficiency of electrical drives is becoming an increasingly important issue. This encourages many researchers to develop new control techniques to reduce the energy consumption in electrical drives. Some of those techniques are more effective than others; some of them can save energy but will affect the response of the drive. Deadbeat-direct torque and flux control has the fastest possible response, allowing direct and independent control of the actual motor states. Using this controller, it is possible to select the optimum stator flux linkage in each switching period to minimize the motor losses dynamically. Many algorithms were derived for motors that are not operating at the voltage limit. This paper will present an algorithm that can be used to minimize motor losses without affecting electrical drive performance. The proposed algorithm works even at the voltage limit during flux weakening operation, it is also easy to implement, doesn't require any lookup tables that require significant effort to obtain, can be applied to any kind of permanent magnet motors, and is feasible in real time for different operating conditions.