Multi-unit motor parallel drive system for electric vehicle application

Aiming at drive system with high performance and high reliability for electric vehicle application, a novel 12-phase permanent magnetism synchronous motor (PMSM) with four independent 3-phase star-connected windings is designed. By analyzing the mathematical model, a four drive units parallel operation drive system is proposed. In a single Field Programmable Gates Array (FPGA) chip, all control algorithms including Space Vector PWM (SVPWM), PID, coordinate transform, current loop, speed loop and so on are implemented, and an all digital drive unit with high reliability and density of integration is designed. Also, a FPGA-based CAN communication coprocessor is designed to implement four drive units parallel operation by CAN bus. Finally, the experimental results carried on a prototype platform are given to illustrate that the proposed four units parallel drive system can share load on average under normal and fault mode, the system have very high fault tolerance and reliability.