| 摘要 |
PURPOSE:To eliminate the irregular rotation of a rotating device by detecting the magnetic field of a pole magnetized near the switching point of the pole of a rotor magnet by a magnetic sensor, and increasing the driving current of a motor in response to the signal. CONSTITUTION:A magnet 102C for compensating a torque ripple is so provided as to have a pole at the switching position of the pole of a rotor magnet 102A. A magnetic sensor 103 detects the magnetic field of an FG magnet 102B, and a magnetic sensor 104 detects the magnetic field of the magnet 102C. A signal for correcting the waveform of a torque ripple is output to a drive amplifier 111 in response to the output signal C of the sensor 104 is output from a ripple correction waveform generator 110 to a drive amplifier 11. An amplifier 111 amplifies a speed deviation signal at an amplification factor in response to the output C of the sensor 104, and supplies it to a motor 100. |
