| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a brushless motor driver that reduces torque fluctuation of a brushless motor. <P>SOLUTION: This brushless motor driver includes the brushless motor 1, a speed control means 2 that controls the speed by comparing an output of a revolution detector 1a of the brushless motor 1 with reference speed, a phase control means 3 that controls the phase by comparing an output of the revolution detector 1a with a reference phase when the speed control means 2 controls the speed within a predetermined revolution error, a sine-wave signal means 4 that outputs a sine-wave signal according to the output signals of the revolution detector 1a and a rotor magnet position detector 1b, a 120° signal means 5 that outputs a rectangular-wave signal from the signal of the rotor magnet position detector 1b, a signal selection means 6 that selects the sine-wave signal means 4 when the speed control means 2 controls the speed within a predetermined revolution error and that selects the 120° signal means 5 when the speed is out of that range, and a drive means 7 turns on the brushless motor 1 at the timing in accordance with the output of the signal selection means 6 and that outputs a current according to the signals of the speed control means 2 and the phase control means 3 to the brushless motor 1. <P>COPYRIGHT: (C)2007,JPO&INPIT |
