| 摘要 |
A motor control apparatus for driving and controlling a motor, in which a signal frequency proportional to a rotation number of the motor is converted into a d.c. voltage by a frequency/voltage converter so as to drive and control the motor by the d.c. voltage. The apparatus comprises a first, a second, and a third pulse generator for successively producing a first, a second, and a third repetitive pulse, respectively, in response to a signal period proportional to the rotation number of the motor; a constant current source; a first reset circuit driven by the third pulse to reset an output current of the constant current source; a first capacitor connected to the first reset circuit in parallel with the first reset circuit and charged by the output current of the constant current source; a sampling circuit driven by the second pulse to derive a saw tooth wave signal appearing across the first capacitor; a second reset circuit driven by the first pulse; a second capacitor connected to the second reset circuit in parallel therewith for charging the saw tooth wave signal through the sampling circuit; and a circuit for changing a pulse width of at least one of the first, second and third pulses substantially in accordance with the output current of the constant current source.
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