I am building a motorized barn door tracker using an Arduino UNO and a stepper motor I took from an old scanner (Mitsumi M35SP-7T). I have been unable to find the datasheet for this motor specifically, only that the motor has a 140 Ohm mark on it and that I assume it should be powered from 24V.
I was planning on running the system with the Adafruit Motor Shield which claims to power motors up to 25V, but I am having difficulty finding a power supply that can push 24V. Frankly I am also concerned that I shouldn't even be using a full 24V power source, but I'm not sure that feeling is justified.
Any recommendations on power configuration for this setup? If I should be using a 24V power source, what kind of source is recommended? This was the only datasheet I could find that came close to this stepper motor: http://vinvin.dyndns.org/projects/M35SP-7T.pdf
On a related note, on the Arduino forums, it looks like someone else was trying to use the exact same stepper motor with a 24V power source: http://arduino.cc/forum/index.php/topic,13711.0.html
Thanks.
UPDATE: It seems that the scanner itself ran on 12VDC 1A. Not sure how that might affect this situation. I just need to be able to run the motor with as much torque as possible.
Best Answer
There are 2 versions of the motor in the datasheet, which is liked in the O.P.: +6V version and +24V version. But the datasheet doesn't say what the markings on the motor are in either of the versions. However, the datasheet tells what the DC resistance of the windings should be in each version (table on p.2). 8Ω for +6V version. 50Ω for +24V version. If you measure the resistances of the windings, you'll be able to tell which version you've got. This stepper is unipolar, so it should have a common connection. Measure resistance between each winding and the common.