无刷直流电机调速系统转矩脉动抑制方法研究

摘要

通过对无刷直流电机开通期间的相电流和关断期间的相电流分析，经过实际计算得到电磁转矩的表达式，得到相应的电磁转矩脉动曲线。基于电流预测方法通过将预测模型分为模型建立、反馈调整和性能优化3步，通过控制换相电流保持在稳定的状态，从而实现对转矩脉动的抑制。通过仿真和实际实验表明，该无刷直流电机调速系统在实际运行中具有转矩脉动小、响应速度快等优点。%The phase current of BLDCM during the opening period and shutdown period is analyzed. The electromagnetic torque expression is obtained by actual calculation,and then the corresponding electromagnetic torque ripple curve is obtained. The prediction model is divided into model establishment,feedback tuning and performance optimization with current prediction method. The phase commutation current is controlled in a stable state to suppress the torque ripple. The simulation and practical experiment results show that the BLDCM speed control system has the advantages of small torque ripple,fast response speed,etc.