Brushless motors are widely used in agriculture,medical care,education and other scenarios,with the advantages of high speed and long life,but in high-speed environments and voltage sampling,the phase difference between phase cur-rent and phase voltage makes brushless motors have problems such as low accuracy and inaccurate torque output. In order to solve the above problems,a high-frequency three-phase current control hardware was designed,the combination of PI/PD control was proposed,and a PI/PD dual closed-loop feedback control system was constructed. The finite difference time method is used to simulate the system,and it is proved that the PI/PD can reach 99.91％ of the target,and at the same time,it has better system response and stable performance than other control methods. In the hardware test,the target state can be reached in 3 s within 2500 r/min,and the absolute error is within 3 r/min,which proves that the system has excellent control accuracy,speed and robustness.
关键词
无刷电机/控制系统/有限差分时间法/建模与仿真
Key words
brushless motor/control system/finite difference time method/modeling and simulation
维普
万方数据