CONSTANT SPEED CONTROLLER OF DC MOTOR

摘要

PURPOSE:To remove an unnecessary pulse by processing a rectifying pulse and a sawtooth wave by a threshold value processor. CONSTITUTION:A current pulse is full-wave rectified by a waveform rectifier 15. Unnecessary component is removed from the rectified pulse by the first threshold value processor 12. When the gate signal of a gate circuit 13 is high level, the frequency of the pulse is converted to a voltage through the gate circuit 13, a sawtooth wave generator 4 and a sample-holding circuit 16. The converted voltage is compared with a reference voltage by a speed controller, and the rotating speed of a DC motor 2 is controlled. A gate signal applied to the gate circuit 13 is obtained by processing the output of a sawtooth wave generator 14 by the second threshold value processor 14. Thus, a speed control which is not affected by the influence of a noise can be performed.