There are two ways to start a motor that is going to be run with static phase conversion. The issue then becomes how to start said motor, because a three-phase motor will NOT START on single phase by itself. ![]() Otherwise said, with single-phase power we can run a three-phase motor. We say this has “2 legs”.Ī three-phase motor will RUN on only two of its three legs. In a typical household, 220 VAC exists on double-pole breakers. The idler motor in the rotary converter starts and runs in a static mode. To get to rotary conversion we must first understand static conversion. The frame spec and shaft condition of the idler is not important so a surplus motor can be used. My largest machine tool motor is 3hp and thus I bought a spare 3hp, three-phase motor to be my idler. ![]() The general rule of thumb is that you can start and run a motor equal to the hp of your idler.
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