Patent ID: 6262557
Filing Date: 2001-07-17
Classification: H02P

Abstract:
A motor comprising:a movable member;Q-phase windings (Q being an integer of 3 or more);voltage supplying means, including two output terminals, for supplying a DC voltage;Q first power amplifying means each including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings;Q second power amplifying means each including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;altering signal producing means for producing altering signals;first distribution control means for producing first Q-phase signals responding with at least one of the altering signals of said altering signal producing means, so as to determine an active period of each of said Q first power amplifying means responding with said first Q-phase signals, the active period being an active electrical angle larger than 360/Q degrees, thereby causing at least one of said Q first power amplifying means to be in the active period;second distribution control means for producing second Q-phase signals responding with at least one of the altering signals of said altering signal producing means, so as to determine an active period of each of said Q second power amplifying means responding with said second Q-phase signals, the active period being an active electrical angle larger than 360/Q degrees, thereby causing at least one of said Q second power amplifying means to be in the active period; andswitching operation means for causing at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching;said switching operation means including:current detecting means for obtaining a current detected signal corresponding to a composed supply current of negative or positive parts of Q-phase drive currents to said Q-phase windings, andswitching control means for comparing an output signal of said current detecting means with a command signal and switching at least said Q first power amplifying means simultaneously to an off state when the output signal of said current-detecting means reaches the command signal, thereby causing said at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching responding with the comparison result.