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Question about dc motors


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Finishing kmg grinder clone with 3.5 hp DC treadmill motor. Have to wait a couple weeks for the controller. But I really want to run the grinder to check for allignment and direction of rotation. The motor is rated for 130 volts. Can I hook up a car battery for a no load test run. And yes, I'm out side of my knowledge base as to DVD motors lol. Thx. Keith

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You should be fine on the lower voltage.

 

The car battery should give the current needed (the rating is likely to be a bit of a lottery, but working on 3.5 HP being 2625W, 2625W/130V gives 20.2 Amps as a ballpark figure). That's a fairly high current for a charger, so the battery is probably the safest bet unless you have a charger rated for high current.

 

Speed varies with Voltage, so will be low: about 10% of the rated speed at the 12-point-something Volts a car battery will give.

 

Should be fine for checking tracking and alignment.

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