In general, a static power converter producing a variable frequency, variable magnitude polyphase output-voltage from fixed polyphase a. C. Mains is required and this can be achieved in one of two ways.

• 一般来说,必须使用一种静电功率变频器从固定多项交流干线中产生变频及可变多相输出电压值,有两种方法可达到此目的。