| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotating position detecting circuit for a sensorless motor not utilizing counter-electromotive force, and a motor apparatus. SOLUTION: A motor 1 is driven by superimposing the high frequency sensor signal respectively to the Sin wave drive signal and Cos wave drive signal by means of the adders 5S, 5C. A sensor signal is extracted from the signal flowing the motor 1 with a band-pass filter 9 and this sensor signal is demodulated as the rotating position detecting signal. The sensor signal from the band-pass filter changes its current value depending on the change of the impedance due to rotation of the magnet of the motor. The rotating position of the rotor magnet can be detected by detecting the change of such current value. |
