Patent ID: 6097126
Filing Date: 2000-08-01
Classification: H02K

Abstract:
A three-phase reluctance motor comprising:a stator having a plurality of magnetic poles around which coils corresponding to three phases are wound;a rotatable rotor having a plurality of convex poles opposed to the magnetic poles of the stator;a magnet provided on the rotor for magnetizing alternately the convex poles to N- and S-polarities in a circumferential direction; anda control circuit for magnetically exciting selectively only two of the three phases to the N- and S-polarities, respectively, and for sequentially switching two phases which are to be excited, to thereby rotate and drive the rotor;wherein the stator and the rotor are arranged so as to maintain equilibrium in a two-phase excitation state, and are formed such that in the equilibrium, when phases to be excited next are excited to polarities which are different from the polarities of the convex poles of the rotor and phases currently excited are not excited, a magnetic force of attraction between the magnetic poles excited and the convex poles of the rotor is greater than a magnetic force of attraction between the magnetic poles not excited and the convex poles of the rotor; andwherein a width of each of the convex poles of the rotor and a width of each of the magnetic poles of the stator are adjusted such that in the equilibrium, side ends of the convex poles of the rotor in a widthwise direction thereof substantially oppose side ends of magnetic poles of the phases to be excited next in a widthwise direction thereof.