TRIAC compatibility
TRIAC compatibility
(OP)
I have been looking into controlling single phase 115v motors with a triac but have been finding issues like compatibilty, what i would like to know is what types of motors are compatible with a triac for speed control, any information is greatly appreciated





RE: TRIAC compatibility
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RE: TRIAC compatibility
RE: TRIAC compatibility
Not very well.
No.
What exactly are you trying to do? What will the motor drive?
Keith Cress
kcress - http://www.flaminsystems.com
RE: TRIAC compatibility
RE: TRIAC compatibility
If you look hard enough you can get a single phase (output) VFD, and with that you can use PSC motors. That's probably what you were hearing and whomever said that was misinterpreting your speed control method.
But for the price they will want for a single phase VFD and a PSC motor, it may be easier and cheaper to switch your motor to 3 phase and get an off-the-shelf common VFD that will convert 1 phase to 3 phase. It's inherent in the design and most small HP VFDs will not require any special sizing or modification to be fed with 1 phase power. If you are in North America, you can even get them that will take 115V 1 phase input and give you 230V 3 phase output (up to 1HP).
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RE: TRIAC compatibility
The rotors have high resistance and slip varies with voltage. Low efficiency? Yes. But, since torque is also low, it doesn't matter much. Actually, with auxiliary power suppply needed for a VFD, it is often more efficient to use a triac and voltage control with FHP motors.
Gunnar Englund
www.gke.org
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