Patent ID: 6147429
Filing Date: 2000-11-14
Classification: H02K

Abstract:
An electrical machine, comprising:a stator defining at least one pair of stator slots;at least one armature winding having at least one wire in the stator slots;a rotor within the stator defining a plurality of rotor poles in circumferential succession and a plurality of rotor slots, each of which lies between two successive poles;a current adjustment circuit that provides unidirectional adjustable current;at least two permanent excitation magnets on the rotor for establishing two magnetic fluxes having components in opposite directions in accordance with the direction of displacement of the rotor in the stator, the magnets defining at least one pair of successive magnets; andat least one excitation winding having two wires received in the rotor slots between the magnets of each pair, the excitation winding coupled to said current adjustment circuit to adjustably produce two components of flux such as to oppose the fluxes produced in the magnets of the pair, the excitation magnets and the excitation windings selectively establishing closed magnetic circuits passing around the armature winding.