Analytical Modeling and Simulation of Overexcitation Process in Hysteresis Motor

چکیده مقاله

The hysteresis motor is a well-known synchronous motor that is used in special small power, high speed applications. Dynamic modeling and analysis of this motor is more complicated than permanent magnet synchronous motors (PMSMs) or induction motors (IMs) due to nonlinearity behavior of rotor magnetic material. Overexcitation is a unique phenomenon that only occurs in hysteresis motor that can be proposed as; when the terminal voltage V_i of the hysteresis motor running at synchronous speed is continuously increased up to nV_i (n > 1) and then continuously decreased to V_i, input currents are reduced and output power is increased at the same time. Consequently, overexcitation reduces the stator copper and enhances efficiency. Till now, there isn’t any analytic dynamic model of this overexcitation. In this paper, based on a novel dynamic model of hysteresis motor, the overexcitation phenomenon is investigated and transient performance of motor is simulated via Matlab/Simulink.