Electrical – use a 150w 12v 775 DC motor with an old 800w PC PSU

amperagedc motorpower supply

Is it possible to use a 150W 12V motor with a PC PSU?

I know that it means that motor will draw a current of 12.5A from the PSU. The PSU can supply 20Amps in total on the +12V rail. As soon as connect the motor to pc PSU it will short and trip the supply( overcorrect protection is triggered).
I know that PC PSU hasn't been designed for motors but is there anyway to make them work together?

Best Answer

Yes you can. But! With motors you may get power flowing back to PS, and this kind of PS probably will not like it much. And you will not know in advance, this is something that is hard to predict. So you need either a servo drive with a regeneration resistor, or a huge capacitor to absorb excess energy.

But having all that said, i bet everything will be fine. Just give it a try.

Edit. Be sure you are not just plugging a brushed motor to a PS. For that you need either a servo drive or at list something to limit the current when the motor is not running (zero speed, not necessarily stuck- this is the stall condition).