Modeling and simulation of the double-closed loop control system of counter rotating permanent magnet brushless DC motor

Unmanned underwater vehicle (UUV) has extensive and important use in military and civilian. The traditional power system of UUV adopts rotating propeller propulsion system, and has the following main disadvantages: low efficiency of power system, big noisy and large size. For the shortcomings of UUV power system, the research studies the new power system - counter rotating permanent magnet brushless DC motor (BLDCM). The research infers the mathematical model of counter rotating permanent magnet BLDCM according to the ordinary permanent magnet BLDCM, and designs the speed-adjusting controller. The speed-adjusting controller adopts double-closed loop control system that inner loop is current loop and outer loop is speed loop, and the research conducts the modeling and simulation of counter rotating permanent magnet BLDCM based on Matlab/Simulink. The simulation results show that the design of double-closed loop controlling system is consistent with theoretical analysis. Compared to the previous UUV power system, the new power system improves greatly power system efficiency, reducing significantly noise, and greatly reducing the volume and saving space. Therefore, this research proposes the double-closed loop control system of counter rotating permanent magnet brushless DC motor, and has some value for promotion of UUV power system.