Novel Digital Control Method with Pulse Width Modulation for Half-wave Rectified Brushless Synchronous Motors

We propose a novel digital current control method for half-wave rectified brushless synchronous motors (HWRB-SM) with pulse width modulation (PWM) at fixed switching frequency. For HWRB-SMs, the field magnetic flux must be excited by high-frequency stator currents. Due to nonlinear dynamics of diode short-circuiting winding, an appropriate mathematical model is required controlling excitation current. In this study, we developed equivalent models both and fundamental one. The proposed employs PWM resonant controllers realize that robust against nonlinearity diode. was validated using experimental motor system.