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This differs from the apparently similar induction motor which also has windings that are energised in a rotating phased sequence, in that the magnetization of the rotor is static (a salient pole that is made 'North' remains so as the motor rotates) while an induction motor has slip, and rotates at slightly less than synchronous speed.
This absence of slip makes it possible to know the rotor position exactly, and the motor can be stepped arbitrarily slowly.
This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the electrical design as some sort of switching system needs to be used to deliver power to the different windings.
With modern electronic devices, precisely timed switching is not a problem, and the SRM is a popular design for modern stepper motors. However, controller technology that limits torque ripple at low speeds has been demonstrated.
There are 3 phases in an asymmetric bridge converter corresponding to the phases of the switched reluctance motor.