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Most AC-motors are multi-phase (ie: 3-phase) because they *work* using rotating magnetic fields (plural = phases)...whereas DC-motors typically use only a single winding (but CAN actually have multiple windings) and thus are only 'single' phased.
It was only meant to clarify the fact that "...maximum torque at low speed..." is a hallmark of DC-motors, but not so of AC-motors.
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