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Commonly used terms in the Electrical industry.
reluctance
the resistance to magnetic flux in a magnetic circuit; analogous to resistance in an electrical circuit.
reluctance motor
a motor constructed on the principle of varying reluctance of the air gap as a function of the rotor position with respect to the stator coil axis. The torque in these motors arises from the tendency of the rotor to align itself in the minimum reluctance position along the length of the air gap.
reluctance torque
the type of torque a reluctance machine's operation is based upon.
A reluctance torque is produced in a magnetic material in the presence of an external magnetic field, which makes it to line up with the external magnetic field. An induced field due to fringing flux develops a torque that eventually twists the magnetic material around to align itself with the external field.