SKEDSOFT

Permanent Magnet Stepper Motor

To explain the operation of a permanent-magnet stepper motor, consider the simple schematic diagram. The stator has two sets of windings (i.e., two phases), placed at 90°.

This arrangement has four salient poles in the stator, each pole being geometrically separated by a 90° angle from the adjacent one.

 The rotor is a two-pole permanent magnet. Each phase can take one of the three states 1, 0, and -1, which are defined as follows:

State 1:current in a specified direction

State -1:current in the opposite direction

State 0:no current