| 摘要 |
PURPOSE:To facilitate the compensation of a circulation transfer function at the time of varying the rotating speed of a rotor by forming a compensating circuit which receives an error signal of an arithmetic amplifier provided with a resistor between the input and the output and an arithmetic amplifier provided with a resistor and a capacitor. CONSTITUTION:The speed and the phase of a motor 1 for magnetic recorder/ reproducer or the like are inputted to a mixer 7 to obtain an error signal, thereby controlling the rotation of the motor 1 via a compensating circuit 8. At this time, the circuit 8 is formed of the first arithmetic amplifier 11 having a resistor R4 between the input and the output, the second arithmeic circuit 12 having a resistor R6 and a capacitor C2, and a DC voltage source V2. Accordingly, the circulation DC amplification factor of the control circuit is set to infinitive, the ordinary error is set to zero, and the resistances of the resistors R3, R4 are switched in response to the speed of the motor, thereby compensating the circulation transfer function of the speed system in response to the variation in the rotating speed, and facilitating the integration of the switching circuit. |
