A New Current Control Mode for Switched Reluctance Motor Drive with DSP Controller

摘要

This paper firstly introduces the necessity of this 90-degree phase-shift current control (PSCC) mode. Afterward, the principle of PSCC is described in detail, including the hardware requirement and software programming. The analysis indicate that with this control mode, chop frequency in winding can reach 20kHz with 10kHz power switches and control frequency can reach 40kHz at the same time. Subsequently, based on the linear and nonlinear mathematical models of the switched reluctance motor (SRM), some simulation work has been done. The simulation results show that when we apply this mode to SRM drive (SRD) system, the current waveform becomes better. So the ripple of the torque has been reduced simultaneously and the vibration and acoustic noise are reduced involuntarily. Stationary test makes clear that the acoustic noise is diminished greatly. At the last, some experiments have been presented on a 50kW SRD system used for electric vehicle (EV). Experimental results indicate that this mode can be implemented feasibly and have good action on SRD system.