I want to control a zen spindle dc motor, 50 -100 watt motor, 32 volt psu, draws around 1 -2 amps.
I want to control the speed of this motor from 24 - 32 volts, which roughly translates to 5000 - 8000 RPM
I'm using my microcontroller to drive a series of stepper drivers(pololou drivers) these are attached to a 24v psu, and their grounds and the micro grounds are all attached. The microcontroller also sends a pwm signal to canakit motor controller, pulsing the enable line. http://www.sparkfun.com/products/9670
okay, lack of electronics knowledge incoming, treat me as a child, I'm afraid to hook this motor controller and power supply and ground back to my micro controller because of the possibility of ground loops, I don't know, it doesn't feel right to have both psu's attached to the microcontroller thats hooked the my computer... fear...
so I wanted to optoisolate it, I bought this board here: http://www.sparkfun.com/products/9118
I'm not sure how to use this, if it will work, or if it is needed or actually harmful?