A method of pwm driving a brushless motor with digitally stored voltage profiles with reduced losses

摘要

A method of driving a multiphase brushless motor with N windings connected in a star or in a polygonal configuration and driven according to a certain periodic voltage profile includes cyclically keeping for a certain time interval at least one of the N windings in a fixed state of low or high saturation by applying to the other phase windings instantaneous voltages according to a predefined different periodic voltage profile such that the resultant voltages on the windings are coherent with the certain periodic voltage profile. The number of intervals, in an entire electric period, in which said fixed high or low saturation state of one winding is produced, depends on the predefined driving profile and upon the number N of windings of the motor.