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.. is what we call a "consequent pole" motor.Such a motor has n real poles and m real and apparent poles, where m equals 2*n, hence there is a 2:1 ratio between speeds. Usually a 2:1 HP rating, too, although constant HP motors do exist, but not using the wiring diagram shown, above.In such motors intended for machine tool applications, the low speed is series ∆ whereas the high speed is parallel Y.It is possible to use these with a static converter, but the required capacitance is necessarily fixed, and is, therefore, optimum for series ∆ but not for parallel Y, or is optimum for parallel Y but not for series ∆, or is somewhere in between and hence not optimum for either.The current requirements of the subject motor appear to be modest. A relatively small 230:400 transformer could be used for voltage step-up, and a higher voltage version of the usual RPC starting circuit could be used. Balancing caps could be added, too.
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