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Discussion Starter #1
friend was roasting a pig yesterday.
He called me and said the spit quit turning.
The spit is controlled and powered by the following two components.

http://www.dartcontrols.com/product-guide/analog-dc-speed-controls/250g/

http://www.grainger.com/product/DAYTON-90VDC-VoltageDC-Gearmotor-6Z413

We determined the controller failed and bypassed it.
We hooked the motor direct to a 12volt car battery and it worked.

Finished roasting the pig and it came out great.
My question is that the motor calls for 90vdc.
Why did it work with a 12vdc battery?
Does he really need to replace the Dart controller?
It is quite expensive.
Can he continue to use a 12vdc battery and not hurt the motor?
Thanks,
David
 

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I would think it would be ok,

Did it turn slower on the car battery?
 

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If it's a fan cooled motor, turning around 1/8 of it's rated speed isn't good for prolonged use, if the motor is loaded.
 

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Discussion Starter #4
He didn't say if it turned slower.
He tried it a few days earlier and it worked.
Yesterday morning it didn't work.
 

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Message In Blood
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And fyi, a drive can be had for 175.
 

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Try surpluscenter, they got all kinds of odd ball stuff at good prices.
 

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My question is that the motor calls for 90vdc.
Why did it work with a 12vdc battery?
Can he continue to use a 12vdc battery and not hurt the motor?
Thanks,
David
Permanent magnet DC motor speed is controlled by voltage. More volts (up to the max listed on motor tag) the faster is spins.

All the controller does is very the voltage to change motor speed.

Yes you can run it off a battery and not hurt it.
 

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worst comes to worst if the motors toast get an ac motor with a gearbox on it to slow down rotation speed, alot of spit roasts are that way.

you can find good s/h stuff on ebay sometimes.

messing with the pulley size gives you more room to change speed, use car belts to hook it up.
 

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