| 摘要 |
PURPOSE:To attain precise positioning by forming a waveform forecasting circuit for forecasting the output waveform of an encoder to control the positioning of a DC servo motor, and while decelerating the motor, stopping the motor at an objective position. CONSTITUTION:A positioning signal generating part 9 in a servo control circuit is provided with the waveform forecasting circuit 91 for forecasting the output waveform of the encoder, a feedback circuit 92 for feeding back the turning speed of a motor, an AND gate circuit 93, an operational amplifier 94, analog switches SW1, SW2, etc. Said circuit 91 decides whether the inclination of the waveform of the encoder exceeds a reference value or not when a motor driving signal is turned off, and if exceeds the reference value, closes the analog switch SW1. A speed feedback signal is applied to the feedback circuit 92 through said switch SW1 in addition to an ordinary speed feedback signal and a signal corresponding to the inertia of a load is applied to a detent circuit 7 for stopping the motor. |
