Patent ID: 6774590
Filing Date: 2004-08-10
Classification: H02P

Abstract:
A method of starting an electric brushless rotating machine for driving an internal combustion engine which has a magnetic rotor joined to an output shaft of the internal combustion engine and a set of stator windings of a first phase, a second phase, and a third phase arranged at equal phase intervals of an electric angle of 120 degrees so that the stator windings are energized in a sequence for forced commutation according to a rotating position detecting signal from the rotor, comprising the steps of:energizing between any two of the first, second, and third phase stator windings for initial magnetization at the startup to hold the magnetic rotor at a position; carrying out the forced commutation to energize the windings of the phases in a sequence while gradually increasing the level of the energization for forcefully rotating the magnet rotor; and generating the rotating position detecting signal from a voltage signal induced on the not-energized windings during the forced commutation and carrying out a normal action of the energization based on the rotating position detecting signal thus allowing the magnetic rotor to drive the output shaft of the internal combustion engine, and canceling the energization when the number of revolutions or the full turning motion in the internal combustion engine determined from the rotating position detecting signal reaches its predetermined level or times.