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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.
当销往其他国家和地区时，设备因应本地电网用电标准而做相应改动，只需设备一台变频器即可。
When exported to other countries and regions, equipment according to the local power grid electricity standards and to make corresponding changes, just a frequency converter device.
操作及安装时应注意不能有金属、水、油或其他异物，否则损坏变频器或造成变频器不能正常工作。
Installation and operation should avoid all chips, oil, water or other foreign materials that can get into the door-motor transducer.
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