Patent ID: 6958877

Claim:
A motor comprising: a rotor having a field part which generates field fluxes; Q-phase windings wherein Q is an integer of 3 or more; voltage supplying means, including two output terminals, for supplying a DC voltage; Q first power amplifying means, each of said Q first power amplifying means 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 of said Q second power amplifying means 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; position detecting means for producing a position signal which responds with a rotation of said rotor; and activation operation means for controlling active operation of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means; and that said activation operation means includes starting operation means which starts activation of said Q first power amplifying means and said Q second power amplifying means in response to a start signal, and said starting operation means comprises: initial phase setting means for setting an initial activation phase of drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal; phase changing means for changing sequentially the activation phase of the drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in the positive direction in response to time; and phase correcting means for correcting the activation phase of the drive signals to said Q-phase windings in response to either or both of the rising and falling edges of said position signal.