FIELD WEAKENING FOR A DOUBLY SALIENT MOTOR WITH STATOR PERMANENT MAGNETS

摘要

A device for field weakening in a doubly-salient variable reluctance motor having permanent magnets (22, 24) in the stator (10). The field weakening increases the constant power range of the motor and is accomplished by controlled movement of steel insets (16, 36) toward and away from the sides of the stator (10) proximate the permanent magnets (22, 24) to provide a controllable by-pass flux path thereabout. Alternatively, the field weakening may be accomplished by a flux by-pass collar (40) which may be angularly positioned around the stator (10) to bridge the permanent magnets (22, 24) of the motor with discrete magnetic sections, thereby providing an alternate by-pass flux path around the permanent magnets (22, 24) in addition to the main air gap flux path. A third alternative means for maintaining a constant power range is accomplished by controlled axial sliding of the permanent magnets (22, 24) themselves into and out from the stator (10).