Aiming at the problem that the synchronous control of double brushless DC motor is difficult to meet the requirements of speed proportional synchronous control and high-precision control,an improved cross coupling control structure is proposed based on the cross-coupled control structure,and fuzzy control algorithm is introduced to design a fuzzy PID controller.By analyzing the mathematical model of brushless DC motor,combined with fuzzy PID control and space voltage vector pulse width modulation(SVPWM)technology,the improved cross-coupled control is simulated and analyzed on MATLAB/Simulink simulation experimental platform.The simulation results show that the improved cross-coupled control can realize the speed proportional synchronization control of the dual brushless DC motor. Compared with the traditional PID control,the fuzzy PID control can reduce the synchronization error by 4%,24%and 22%respectively in the starting,speed increase and load mutation stages,and has higher control accuracy and better stability and robustness.