| 摘要 |
PURPOSE:To simplify the motor controlling device by overlapping and sampling a signal corresponding to a phase difference of a signal corresponding to a revolving speed and a reference signal on a saw-tooth wave signal during a period corresponding to the revolving speed. CONSTITUTION:The reference signal (a) and a speed signal (b') corresponding to the rotation of the motor 3 are fed to a phase difference detecting circuit 9, and a signal (l) corresponding to the phase difference of the reference signal (a) and the speed signal (b') is taken out. The signal (l) and the speed signal (b') are applied to a saw-tooth wave generating circuit. The saw-tooth wave generating circuit generates the saw-tooth wave signal by charging and discharging a capacitor in the period corresponding to the speed signal (b'), and causes the capacitor to be charged through capacitor is charged during the pulse width of the signal (l). An output of the saw-tooth wave signal generating circuit is sampled by the speed signal (b'), and the motor 3 is controlled by said output. |
