Abstract
To improve the reliability and safety of Electro-Mechanical Actuator (EMA) in real life applications, the dual-redundancy brushless direct current motor (BLDCM) controller for EMA is designed and analyzed. The structure of BLDCM is discussed in this paper. By analyzing the relationship between mutual inductance and self-inductance of three-phase winding of BLDCM, the mathematical model of motor is established. Based on the connection of electromagnetic torque and load torque, the motor body is built in Matlab/Simulink. When it comes to adjusting the motor speed, combined with fuzzy control, proportional-integral-derivative (PID) control is applied to BLDCM servo system. According to fuzzy control rule, specific control rules of PID parameters are set. By using fuzzy PID control to regulate motor speed, the dynamic and static performance of BLDCM servo system are significantly improved. The final test is carried out, test results show that by using fuzzy control, the motor speed response is closer to reference value and it can eliminate zero-crossing error. Results show that designed servo controller is effective and efficient.
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