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Feb 7, 2016 at 18:32 comment added John D @ChrisStratton Yep, absolutely right, though I did a full bridge PWM V/Hz controller for a single phase AC induction motor that had fairly impressive performance over a wide speed range. The start winding cut out electronically after start up near rated frequency. More suitable for a fan than a drill press though.
Feb 7, 2016 at 4:36 comment added Chris Stratton @JohnD - a three phase induction motor perhaps, but probably not this single phase capacitor start centrifugal switch induction motor.
Feb 7, 2016 at 2:55 history edited Ecnerwal CC BY-SA 3.0
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Feb 7, 2016 at 2:22 comment added John D As a side note it is possible to vector control an AC induction motor for variable speed with nearly full torque down to 0 RPM. It's not a $100 solution either though.....
Feb 7, 2016 at 1:24 history edited Ecnerwal CC BY-SA 3.0
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Feb 7, 2016 at 1:19 history edited Ecnerwal CC BY-SA 3.0
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Feb 7, 2016 at 1:10 history answered Ecnerwal CC BY-SA 3.0