Basic information is required before any step motor can be designed. Listed here is information for an example specification sheet.
FIGURE 5.52 Holding torque, curves showing relative position of each phase.
Example Specification Sheet
Step angle, degrees
Step accuracy, percent
Rotor inertia, ozins2
Maximum holding torque, ozin
Maximum operating speed, steps/s
Number of phases
Voltage
Drive configuration
• Bipolar
^ Unipolar
• Chopper
Shaft size, in
Maximum motor diameter, in
From the specification sheet the type of step motor can be selected. Some general characteristics of each type are shown in Table 5.12 to assist with the selection.