Final answer:
A variable reluctance stepper motor is an electromagnetic motor that converts electrical pulses into rotational motion by utilizing magnetic attraction and repulsion.
Step-by-step explanation:
A variable reluctance stepper motor is a type of electromagnetic motor that converts electrical pulses into rotational motion. It works based on the principle of magnetic attraction and repulsion. The motor consists of a rotor with teeth and a stator with electromagnets. When an electrical pulse is applied to the stator windings, the rotor aligns itself with the magnetic field created by the energized electromagnet. By sequentially energizing different electromagnets, the rotor is driven forward or backward in small steps, resulting in precise control of the motor's position and speed.