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Old 12-28-2011, 05:34 PM   #1
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Power Converter for electric motor


Hello, I'm not sure if this is the right place to ask but if not please direct me.

I have an electric motor from a tread mill that I am trying to turn into a lathe. Unfortunately the motor control board from the treadmill is shorted otherwise I would use that. My question is how do I power and control the motor? How do I convert the wall power to something the motor can use and how can I control the speed of the motor (such as a rheostat)?

The specs on the motor are:

2 HP 90 Volt DC 18.8 Amps.

I'm guessing that I will need to build a power supply and attach a control device to change the electrical input to the motor in order to control the motor speed.

Any help?

Also, If anyone knows how I can fix the motor control board (without replacing it, $500) I would be greatly appreciative. I had the control board, display board, motor, large capacitor, speed sensor, etc... working and while testing the motor i was turning the speed up to 3.5 MPH and the circuit break switched. I turned the switch back on and tried to turn the motor on but as soon as I hit the switch the circuit breaker switches again. I have not been able to get any results other than these. I know the motor still works as I can hook the capacitor and (large rectangular thing with lots of copper wound inside and says Rev L on top) up to the wall and the motor spins, yet choppy and full power.

Thanks


Last edited by Redrider1080; 12-28-2011 at 05:39 PM.
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Old 12-28-2011, 06:04 PM   #2
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Power Converter for electric motor


Quote:
Originally Posted by Redrider1080 View Post
I have an electric motor from a tread mill that I am trying to turn into a lathe.
Unfortunately the motor control board from the treadmill is shorted...
1) yellow pages
2) look for motor dealers

hth

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Old 12-28-2011, 06:09 PM   #3
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Power Converter for electric motor


As in sell it?
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Old 12-28-2011, 06:12 PM   #4
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Power Converter for electric motor


because of the power level, 90Vdc & ~20A = 2kW a rheostat is not really feasible. you would need a power electronic controller with a rectifier up front. these are not that difficult to build if you have some electronics experience and don't mind spending the time making it a full project.

a 2kW, 100V variable DC power supply might work. got any of those lying around?
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Old 12-28-2011, 06:17 PM   #5
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Power Converter for electric motor


I do have a little experience, but I don't know what a power electronic controller is. As for the part, not that I can think of, unless you know of something common to a household that could be scrapped.
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Old 12-28-2011, 06:22 PM   #6
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Power Converter for electric motor


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Originally Posted by Redrider1080 View Post
As in sell it?
as in buy a motor designed for your lathe purpose...
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Old 12-28-2011, 07:39 PM   #7
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Power Converter for electric motor


Check out this manufacturer. You will need a speed pot (potentiometer) to control speed. You can buy this control for less than $150.00 plus the speed pot. Maybe less.
Building this would like re-inventing the wheel. I would be willing to bet the controller that was in the treadmill was built by KB. Here is their web site. http://www.kbelectronics.com/Variabl...DC_Drives.html. They do not sell direct. I think they don't. Just find a local distributor or any electronics store and they can hook you up. Look at Model number KBIC. 1/100-3 HP. 120 volt. The very first one listed. Chassis mount. You can also get one with an enclosure and controls on the front. Mount to the lathe, connect the 120 volt supply and connect the motor and start machining. Good Luck. Its real easy.

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