低开关频率下SVPWM同步调制策略对异步电机铁损的影响

The Effect of SVPWM Synchronous Modulation Strategy on Asynchronous Motor Iron Losses in Low Switching Frequency

在Bertotti分离铁耗计算模型的基础上,结合标准正弦供电时电机损耗,推导PWM控制逆变器供电下异步电机损耗的计算模型,该模型主要体现了逆变器参数与电机损耗之间的关系。在大功率和低开关频率的铁路系统中,利用上述模型更深一步地分析与总结了恒磁通和恒功率下铁损随运行频率与逆变器参数的变化规律,着重研究了低开关频率下同步调制策略对电机铁耗的影响,以一台7.5kW的电机铁损计算为例,验证了该模型的有效性与可行性,为大功率牵引传动系统电机效率提升的研究提供了参考依据。

On the basis of separate Bertotti iron loss calculation model ,combining the motor iron losses by sinusoidal voltage supply, a calculation model of the asynchronous motor loss calculation model fed by PWM inverter, the model mainly reflects the relationship between the motor iron losses and inverter parameters. In high power and low switching frequency of the railway system, using the above model further analysis and summary of the iron loss under constant flux and constant power changing with the operating motor＇ s frequency and inverter parameters.This paper studies the lower switching frequency synchronization modulation strategy for the influence of the motor iron losses, with a ？..5 kW motor iron losses calculation, and verifies the effectiveness and feasibility of this model, provides a reference basis for the high power traction driving system of motor efficiency research.