Ive got two 6 wire stepper motors affixed to the knobs of an etch a sketch. I have connected the two common power wires and am controlling the motors via the ULN2003 with my parallel port. The motors are PF35T-48L4s and some information about them is here: (including data sheet)
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_171601_-1
I believe these are rated at 7V, (it says 12V at the top, im not sure why). At 7 volts they struggle heartily with the knob of the etch a sketch and cannot make the cut. At 9 volts they work reliably, able to turn the knobs with success.
I tried 9V hesitantly, as I was not sure what would happen. Is it dangerous to use the motor at 2V higher than its rated? (It may be rated at 12V after all, the above page is quite ambiguous).
At any rate, the does heat up, but not excessively.
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_171601_-1
I believe these are rated at 7V, (it says 12V at the top, im not sure why). At 7 volts they struggle heartily with the knob of the etch a sketch and cannot make the cut. At 9 volts they work reliably, able to turn the knobs with success.
I tried 9V hesitantly, as I was not sure what would happen. Is it dangerous to use the motor at 2V higher than its rated? (It may be rated at 12V after all, the above page is quite ambiguous).
At any rate, the does heat up, but not excessively.