异步电机绕组切换暂态过程分析与实验平台设计

针对变绕组异步电机绕组结构与普通异步电机的差异性,为反映绕组切换的暂态过程,并为电机控制系统和绕组切换电路设计提供参考,提出了一种新的变绕组异步电机的建模方法。通过对电机绕组切换前后的两套绕组分别进行了独立分析,列写了电压与磁链方程,得到了电机统一状态方程表达式,并对其进行了仿真分析。在此基础上,设计并搭建了变绕组异步电机的实验平台,通过选取合适的绕组切换电路参数,减小了绕组的切换时产生的电压尖峰,实现了平滑切换。实验结果表明,所设计的实验平台可以实现电机绕组的平滑切换,可有效抑制切换时产生的冲击;该建模方法是有效的。

Transient analysis and experiment platform of winding changeover induction machine

Aiming at the structure difference between general induction machine and winding changeover induction machine, in order to re-flect the transient process during winding changeover and provide theoretical basis for control system designing, a new modeling method was proposed. The two groups of winding of each phase were analyzed respectively, after which the flux and voltage equation were built to form a uniform state equation. The modeling result was simulated. An experiment platform was designed based on the modeling and the simulation results. The switch circuit parameters were properly chosen to achieve winding changeover and the voltage peak during changeover suppress-ing. The experiment result indicates that the experiment platform can achieve a smooth winding changeover process and the impulse is effec-tively suppressed, which verifies the effectiveness of the modeling method.