Stepper motors are a special case of Brushless DC Motors. Construction is identical except that they contain no position sensors. Excitation is sequentially applied to the windings, creating the rotating field to produce torque.
- Low torque applications
- Open loop micropositioning
- Timer switching
- Compatability with digital control schemes
- High continuous power dissipation
- High ripple torque
Used for noncritical, low power applications, since positional information is easily lost if acceleration or velocity limits are exceeded.