yobbo II
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Universal motor with VFD
Will a Variable Freq Drive work with a universal motor (on a drill). Since universal motors don't care about the frequency they are driven with (will
work on DC) I am inclined to think that you cannot control the speed with a VFD?
I can not find a clear answer on the net.
Device I am looking at:
This device is described as 'universal'.
https://www.ebay.co.uk/itm/Universal-VFD-Frequency-Speed-Con...
Yob
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Sulaiman
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'Universal' motors have their armature winding connected by the commutator electrically in series with the field winding.
A VFD outputs full ac voltage (unless current limited) at variable frequency,
so would not be suitable for controlling the speed of a universal motor.
A simple triac-based phase controller will work
e.g. https://www.ebay.co.uk/itm/10000W-SCR-Voltage-Regulator-Spee...
CAUTION : Hobby Chemist, not Professional or even Amateur
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Fulmen
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Sulaiman is right.
We're not banging rocks together here. We know how to put a man back together.
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raffike
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Vfd will work on three phase and two phase(two windings,one connected thru capacitorI) motors. Simple triac based schemes seems to work fine for
universals.
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yobbo II
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Thanks,
Will purchase triac type. The triac types always instantly get destroyed when used with induction motor. This is what happened my last one.
Yob
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