I saw the simple label attached in my stepper motor. It told me the following:

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Stepping Motor
Step-Sync
DC 1.5A
1.8 Deg
Lot No 03917
Type 103H7123-0244 (I think it should be the part number)

Sanyo Denki
Made in Japan
6036301-2
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I browsered the web site "http://www.sanyo-denki.com/index2.htm" before but I can't find the exact part number they had. But I guessed it should belong to 2 phases stepper motor with 6 leads. I tried it before using the same method of motor driving using 4 phases with 6 leads and it worked properly. What is the difference between 2 phases and 4 phases stepper motors? I can use the same method to drive them properly. Why? In addition, the specification just told me the value of the supply current so that I can use any voltage with current = 2A to drive them properly? Can anyone help me? Thank you very much!

Bruce.