| 摘要 |
PURPOSE:To obtain positional signals having high reliability by removing the distortion of a waveform of counterelectromotive voltage of the motor with no commutator and using fine sine wave type voltage obtained by also adding an angle of lead of set control. CONSTITUTION:VTR Phase voltage (b), phase thereof leads more than VRS phase voltage (a) by 120 deg., is extracted from a transformer 4 of delta-star connection. The VTR phase voltage detected is integrated through an integrator 5, and a voltage waveform (c), phase thereof lags more than VTR phase voltage by 90 deg. that is, phase thereof leads more than VRS phase voltage by 30 deg., is obtained. The positional signals (d) of a rectangular wave, the angle of lead betao of set control thereof is set at 30 deg., are acquired by comparing the waveform (c) through a comparator 7. Since only a DC section at the output side of the integrator is detected by means of a primary lag circuit 6 connected to the integrator 5 and negatively fed back to the input side of the integrator and a DC section at the input side is offset, the DC section is not contained in the input and output of the integrator, and the motor is stably operated. |
