Patent ID: 9041328
Filing Date: 2015-05-26
Classification: F01N,F02B,H02K,H02P

Abstract:
1. A permanent magnet motor comprising: a plurality of phase windings, each phase winding disposed in a number of slots around the circumference of the motor such that the phase windings in each phase axe complementary and do not serve to counteract one another when energized by a single excitation current; a plurality of permanent magnets in contact with one another without spaces between the magnets such as to provide a continuous permanent magnet shell, wherein the magnets are arranged to provide an electromagnetic field experienced by the windings near the magnets' edges which is of similar strength to the electromagnetic field experienced near the middle of the magnets; and a control system comprising a power supply for supplying current to the motor and a commutation circuit operative for controlling a timing and duration of a square wave current input supplied to individual of the electric motor windings for a period, which precisely matches the angle of rotation through which an interface between adjacent magnets of opposing polarity passes within the span of a winding loop, wherein the commutation circuit is operationally independent of the power supply.