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Control the RPM of a driller.

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pic-novato

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Hi

I want to control the RPM of my electric driller. The range is 40 to 3000 RPM, 220 volts, AC.

What is the best circuit to this?

Thanks in advance.

P.D. sorry for my bad english.
 

Most drillers come with a manual speed control. Also most drills use cheap AC series motors which require rather complex drive to control the RPM. Anyhow crude methods like adding a variable resistor in the current path or using a variac should give some coarse control over the RPM.
 
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