| 摘要 |
PURPOSE:To perform the control of stable speed control in a DC motor drive system while controlling the phase of the motor by producing a feedback pulse having rotary speed information from the sinusoidal output of a rotary angle detector connected directly to a DC motor to be controlled and controlling the motor. CONSTITUTION:The output of a rotary angle detector 6 connected directly to a DC motor 4 to be controlled is coupled via a capacitor 7 in alternating current manner, and an adequate bias is applied to the detector to produce a sinusoidal signal. This signal is applied to two voltage comparators 10, 11 to produce a feedback pulse fFB having a pulse width of the period of time between the predetermined voltage values VTH1 and VTH2. This pulse fFB becomes a signal inversely proportional to the rotating speed of the motor 4 in its pulse width. This pulse fFB is inputted to a phase comparator 1 together with a reference phase pulse fin having the prescribed width to energize a drive element 2 with the pulse formed of the rise of the pulse fin and the fall of the pulse fFB. |
