Frequency Control Motor are the most widely used AC induction motor (also known as induction motors). It is easy to use, reliable, inexpensive, solid structure, but low power factor, speed is also more difficult. Large-capacity low-speed synchronous motor commonly used power machine (see synchronous motors). Synchronous gearbox motor power factor is not only high, but also independent of its speed and load size, it depends only on the grid frequency. Work more stable.
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