- Joined Nov 29, 2005
A 3ph AC synchronous motor with PM rotor also possesses commutation, albeit electronic.Any commutated motor with a permanent magnet runs on DC only. A true universal motor does not have a perm. mag., rather, they have field and rotor windings. When the AC is on one side of the sine wave the field produces a magnetic field opposite of the rotor winding. When the AC switches to the other side then it all swaps position and the motor continues to run, and it always runs in one direction only. A treadmill motor can be reversed if you reverse the positive and negative wires.
You explain it better. Thanks.A 3ph AC synchronous motor with PM rotor also possesses commutation, albeit electronic.
The Universal motor works because it is a Series-wound-field motor, so the field current switches in sync with the armature. current. i.e. retains the same relative polarity.
It does not work with a shunt wound-field DC motor.
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