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Tool Talk Discussion Forum

Re: Electric motor: power vs. rpm

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Author  [Modern View]

12-24-2013 10:29:02

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You can turn down a motor with a AC freq drive if you dial down an 1800 rpm motor to 600 rpm it won't last long. They say don't go below 30% (540 rpms) but I haven't had much luck running them less than 1/2. You may do better if you get an inverter duty motor, some even have a little electric fun that runs independent. ALternative would be to freq drive a 1200 RPM motor 600 would be about 1/2. Not sure if the torque is higher at the lower speeds, if it is that may explain the short motor life at lower speeds. Other alternatives use a 1200 TENC (totally enclosed not cooled)motor, a gearmotor or set it up with a DC motor & drive. I've run them off a little drive with AC in/DC out, the few I've dealt with seemed okay running slow.

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Brad Buchanan

12-24-2013 20:04:39

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 Re: Electric motor: power vs. rpm in reply to wisbaker, 12-24-2013 10:29:02  
A dc motor sounds interesting and I will have to check into that.

Just studying and getting a glimmer on how 3 phase power works and find the whole subject fascinating.

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