TWO-PHASE UNIDIRECTIONAL RELUCTANCE MOTOR

摘要

A two-phase variable reluctance electric motor has four stator poles (81, 82), each pole having a magnetising winding. Pole (81) has a first phase winding and pole (82) has a second phase winding and the phases of the windings alternate around the machine periphery. The rotor has two rotor poles (85) and rotates in an anticlockwise direction. Each rotor pole has a dimension between the outer poleface surface (87) and an inner poleface surface (88) which increases progressively along the rotor pole in a clockwise direction from the leading poletip (T) of the rotor pole (85). The progressive increase in this dimension between outer surface (87) and inner surface (85) is such that a magnetic constriction is defined within the rotor pole throughout progressive overlap of the rotor pole (85) with stator pole (82) from initial overlap of the poletip (t) to full overlap as shown in the drawing. This magnetic constriction represents a limiting constriction in the path presented to magnetic flux in operation of the motor.