【摘要】 为了探究异步电动机电源压频比对效率和功率因数的影响,优化电机与外加电源的匹配,获得一种力能指标优化控制策略。在一定的负载转矩和电源频率下,通过调整电源电压来获取异步电动机的定子电流、效率和功率因数随电压变化的一般规律,分析出效率和功率因数匹配最优的运行点,即该频率下的最佳的电压值,获得最佳压频比。通过仿真和实验结果发现,定子电流最小时对应的效率和功率因数匹配最好,力能指标最优,压频比最佳。最佳压频比控制策略能够使电动机在满足调速要求的前提下,适应不同的负载变化,始终运行在最优力能指标的状态下。更多还原

【Abstract】 To explore the asynchronous motor supply voltage-frequency ratio on the efficiency and power factor,to obtain a power index optimal control strategy.Under certain load torque and power frequency,by reducing the AC-AC inverter output voltage to obtain current induction motor,the general rules of efficiency and power factor with voltage changes,analyze the efficiency and power factor matching the best run point,the optimum voltage value of the frequency,get the best voltage to frequency ratio.The simulation and experimental results show that the corresponding stator current minimum matching the best efficiency and power factor,power index optimal voltage to frequency than the optimum.Optimal voltage to frequency ratio control strategy can make to meet the speed requirements of the motor under the premise,to adapt to different load changes,always run at the optimal state power index.更多还原