Patent ID: 7202620
Filing Date: 2007-04-10
Classification: H02K,H02P

Abstract:
1. The method for dissipating collapsing field energy in an electronically commutated three phase motor having a rotor and a stator assembly with a plurality of stator poles and field windings wound on said poles configured for unipolar excitation from a source, comprising the steps of: (a) providing a phase component winding at each said stator pole energizable from said source in a first polar sense; (b) providing a phase companion winding at each said stator pole in inductive coupling relationship with said phase component winding and energizable from said source in a second polar sense opposite said first polar sense; (c) electrically connecting a said phase component winding from one said motor phase with a said phase companion winding from another said motor phase to define field winding pairs, each corresponding with a step in a commutational sequence; and (d) energizing said field winding pairs from said source in said commutational step sequence effecting the driven rotation of said rotor and additively inductively coupling at least a portion of the collapsing field energy present at the termination of energization of the field windings corresponding with one said step with the phase component winding of a next said step in said commutational step sequence.