Discontinuous Current Vector Control Using PWM Method for Switched Reluctance Motor Driven with Asymmetric H-bridge Converter

This paper proposes a discontinuous current vector control method for a three-phase switched reluctance motor driven by an asymmetric H-bridge converter. The proposed method enables vector control with three-phase discontinuous currents, improving the torque per ampere ratio and the efficiency of both the converter and motor compared to conventional continuous current vector control. Moreover, the proposed method reduced vibration and acoustic noise, as the control parameters can be designed using a mathematical model, and the switching frequency can be determined by a carrier signal, similar to conventional vector control. This paper derives a torque equation considering discontinuous current conditions and describes the configuration of the control system. Additionally, the effectiveness of the proposed method is demonstrated through simulation and experimental verification. In the experimental verification, the efficiency of the proposed method was improved by a maximum of 7.73 percentage points in the converter efficiency, 4.06 percentage points in the motor efficiency, and 9.12 percentage points in the system efficiency compared to the conventional vector control method. Furthermore, FFT analysis of acoustic noise showed a noise level reduction of up to 36.0 dB at 10.9 kHz compared to current hysteresis control, making it equivalent to the noise level of conventional vector control.