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Motor Speed Controller. I have recently purchased a 115v Bodine Electric 42R Series AC Induction Motor Answered

 I want to be able to control the speed of this motor to use for my homemade brass reloading tumbler. I am currently using a cordless drill which is not practical for the lenght of time the brass must tumble.


The specs for the motor are as follows..

42R Series AC Induction Motor
Standard Features
Totally enclosed IP-20 rating.
Fan cooled for high output power.
Class "B" insulation system operated within Class "A" limits to prolong winding and lubricant life.
Aluminum center ring and end shields for high thermal efficiency and light weight.
Permanently lubricated, noise tested ball bearings.
Locked bearing design minimizes shaft endplay.
Application Information
Capacitor is not included. Order with motor if required.
Models are available with either NEMA C face mount or base mount.

Any suggestions would be greatly appreciated.



8 years ago

I work at Bodine and just saw your posting: Looks like you have a fixed-speed, permanent split capacitor (PSC) motor (requires a run capacitor at all times). If this motor has a 115VAC, 60Hz, 1-phase rating then it will run at 1700 RPM (at 60Hz). And I agree with Steve, if you want to salvage this motor for your application, you'll need to add a Nema C-face compatible speed reducer or external gears/pulleys to reduce your speed (but all this will add cost). Maybe check with a local Power Transmission distributor if they have a cost-effective suggestion. Speed controls for PSC motors exist but the speed regulations is very poor and we don't recommend them. These "controls" are often no more than a dimmer switch. The ideal (and more costly) solution would be a permanent magnet DC (PMDC) or variable speed AC (inverter duty) motor or gearmotor and a matching speed controller. But the cost would be $400-$500 for the system, plus the scrap cost of your motor. Likely not a good option for you. Sorry that I don't have a better answer. Good luck!

Regards, Ed... For more product info or to find a PT distributor in your area, you can check on our web site... http://www.bodine-electric.com


Answer 8 years ago

Nice to see a real motor specialist posting in here Ed. What's the secret of "inverter duty" motors ? More iron, because of harmonic heating ?

Look forward to seeing you help out in other motor related questions !



8 years ago

That looks like its going more than 60 RPM ! Slower tumbling MIGHT actually be more efficient in my experience, ours runs at around 20. That means you really need to use pulleys and belts to change the speed to something reasonable. I'm reckoning that the motor you've picked runs ~1700 RPM ? So you need to get between 85:1 (my speed) or 30:1 your speed. You can only practically do that with two reductions, probably around 6:1 and then 5:1