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If you're talking 3-phase AC, it won't spin.
When we say "the motor is single phasing" it is driving 2 of the 3 coils.
This is a very bad thing that will quickly burn the motor out.
Think this way:
Coil A pulls the North pole towards it, then releases it. With no Coil B pulling it to it, the pole gets pulled back to A the next sine wave. It goes no where.
When two are working, the motor bounces betwen coil A and B and just flutters.
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