| 摘要 |
PURPOSE:To measure the rotational speed of a DC motor with high precision by converting the rotational speed of the DC motor into pulses by a pulse generator and outputting the pulses. CONSTITUTION:A speed deviation between a speed command signal AVr and a speed feedback signal AVf is inputted to an amplifier 2 for controlling speed, and a current command signal is acquired. The angle of conduction of a bidirectional thyristor for a power conversion circuit 8 is controlled by a current deviation between the current command signal and currents detected by a current detector 3. A speed-detecting arithmetic section 22 receives pulses outputted from a pulse generator 21, and a counter 222 counts the pulses of the pulse generator 21 on the basis of a direction discriminating signal. The pulse discrete value is transmitted over a rotational-speed arithmetic section 224, and rotational speed N is acquired. |
