双变频器控制，袋长即设即切，无需调节空走，一步到位，省时省膜。
Double transducer control, flexible bag length cutting, operator needn't to adjust the unloading working, time and film savable.
本文以三层电梯为设计对象，结合三垦vm 06系列恒转矩高性能变频器，开发出一套交流双速的PLC电梯控制系统。
In this paper, three elevators for the design of objects, combined with Sanken VM06 series of high-performance constant torque converter, developed a two-speed exchange of PLC elevator control system.
在分析了其他变频器的局限性后，指出了双PW M变频器是交流励磁的最佳电源方案，详细地讨论了电压型双pw M变频器的工作原理与控制策略。
In this paper, a back-to-back PWM converter is considered as the optimum scheme of ac excitation power supply and its operation principle and control strategy are discussed in detail.
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