Electronics > Projects, Designs, and Technical Stuff
Variable-speed Single phase motor about to die.
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Circlotron:
One thing that might be causing the motor to run slow is maybe the triac is not giving equal duration positive and negative half-cycles to the motor. That would cause DC to flow in the windings and have a definite braking effect in the motor. Try powering the motor direct from the mains and see if it runs at full speed.
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