| 摘要 |
PROBLEM TO BE SOLVED: To perform position holding control without providing a detector on an output shaft or a driven body of a brushless DC motor.SOLUTION: A driver circuit 220 includes a motor drive circuit 221 that switches a polarity according to a magnetic pole phase signal output from a motor 210 and supplies power to the motor 210, and a rotation position detection circuit 222 that converts the magnetic pole phase signal to represent the rotation amount and the direction of rotation of the output shaft of the motor 210, so as to output a rotation position detection signal with high resolution to the magnetic pole phase signal. |
