| 摘要 |
PURPOSE:To provide a motor control circuit in which a wide r.p.m. region is ensured by suppressing fluctuation of phase difference due to fluctuation of r.p.m. or load while enhancing stability against fluctuation of load due to temperature variation or aging. CONSTITUTION:A motor control circuit comprises reference signal generating means 5, 6, motor speed detecting means 1, 2, a comparator 4 for comparing the phases of output signals from the speed detect means 1, 2 with that of a reference signal, a circuit 7 for smoothing the output signal from the phase comparator 4, a circuit 8 for compensating the phase of output signal from the smoothing circuit 7, and a circuit 9 for driving a motor 3 with an output from the phase compensation circuit 8. The motor control circuit further comprises a circuit 10 for amplifying the phase compensated output signal, a low-pass filter 11 passing low frequency band of output signal from the amplifying circuit 10, and a circuit 12 for adding the output signal from the low-pass filter 11 to the output signal from the phase comparator 4. |
