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Stepper motor problem

I have a lot of small stepper motors with 16 leads (8 pair of windings). Is there some procedure I can go through to find the phase order of the windings. I mean, I need to apply power to these windings, in order, so that the motor will move in the most efficient manner. I tried an oscilloscope on one set of leads while generating a sinusoidal signal on another but the difference in inducted voltage was not enough to tell me which set of leads was closest to the one into which I was generating the signal.

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I think 8 leads means there are basically 4 poles, and a pair of windings go with each pole. Perhaps one could apply a sine wave to one winding and then look for which other winding is the compliment to it; mark it and the phasing as well; repeat until all 4 pairs are polarity marked and grouped together. I would thenconnect the pairs together +...- +...- withthe center as the common (ground or supply) lead. This way, one does not need an H-bridge to drive them; for one drive polarity, power the "left" lead, and for the opposite drive polarity, drive the "right" lead.

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Robert Baer

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