The parameters of the stepper motor can be determined in at least two ways.
The first way is by searching for a pattern in iternet of the label affixed to it. However, if the label is missing poredelya a second way which is experimental. Determine the number of poles. The resistance of each coil. Their head end. Determine the total end. The series of pairs of drive and direction of rotation. Stepper motors are supplied with DC voltage range of 3 volts to 80 volts. This zavitsi of winding resistance. Experimental determination is labor intensive and requires good preparation in elektromnika and electrical engineering.