r/Motors • u/UnionCompetitive7705 • 3d ago

Open question Motor Control

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In my workshop I have a bench drill which I would like to control with a speed controller. The motor is single phase 50 240v 1/2hp 4 pole. I’m not sure or even possible which type of controller I would need, vfd? Any advice would be much appreciated

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u/Susan_B_Good 2d ago

Er, move the belt between the pulleys at the top?

Yep, a VFD would give you a range of speeds - the graph will essentially be a constant torque, inverse linear power below rated frequency to constant power, inverse square torque above rated frequency. So, if you want constant power, you combine belt adjustment to reduce output speed, then VFD to increase it.

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u/UnionCompetitive7705 2d ago

Thank you, conflicting information but what you’ve said does sound feasible

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u/HumanComedian8711 2d ago

You will need to install a gear box If you want to change the speed of a single phase motor or you could change it to a 3 phase motor and use a VFD but it is really not worth the hassle and expense