Implementation of a 50 kW 4-phase switched reluctance motor drive system for HEV

A high-performance fully-digital controller has been designed for the drive of a 50 kW 4-phase switched reluctance (SR) motor built for hybrid electric vehicle (HEV). The SR machine is specifically designed and manufactured to have high power density and low acoustic noise. The controller is based on the advanced digital signal processor (DSP) with internal CAN interface-TMS320F2406 and complex programmable logic device (CPLD)-EPM7128S. The DSP mainly performs several tasks: A/D conversion, new control strategies such as directly average torque control and development of control algorithm, fully-digital hysteretic current-loop, generation electricity control and communication among all vehicle peripherals. The CPLD integrates all periphery logic circuit with responsibility for handling of position signal and intelligent over-current protect. High voltage, large capacity IGBT module and IGBT drive module with fibre-optic interface are adopted. A custom-made rotary position sensor has high reliability. The experimental results show that the controller is met with the system specification and requirement, satisfactorily.