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Hi I want to make a single phase AC motor's RPM controller? I have to drive the machine at too low and high RPM Answered

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iceng
iceng

7 years ago

When the DPDT switch is in the low position this circuit triac will control an induction motor from full to low RPM.

But at low RPM the motor internal air flow cooling is ineffective and will cause the motor to overheat in a short time.

triac-ac-motor-speed-control-circuit.png
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tolland
tolland

Answer 4 years ago

Do you have a link to the original project that explains this?

Thanks!

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iceng
iceng

Answer 4 years ago

Long Goon... Do not mistake this as a true induction motor RPM control.

It is a lamp dimmer class power control.... Less power => more armature slip when a load is applied. Works best with a fan. At no load there will be very little rpm drop until a mechanical load is applied the a big drop in rpm will occur.

In the brush motor mode this will respond more linearly to load or no-load.

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rickharris
rickharris

7 years ago

https://www.google.co.uk/search?q=single+phase+motor+controller&tbm=isch&tbo=u&source=univ&sa=X&ei=vSIGU_nHKYSqhQeVqYDYBw&ved=0CF8QsAQ&biw=1920&bih=919