| 摘要 |
PURPOSE:To prevent the hunting of a DC servomotor by detecting the servomotor operating in a return direction on its overrun, and eliminating the motor torque. CONSTITUTION:The binary output of a counter Q1 which inputs an optional number of pulses at its up terminal is inputted to a D/A converter Q2 as a motor driving voltage. A switch circuit S1 is closed until a timing generating circuit Q5 operates and the servomotor M1 starts turning. The signal from a displacement detector such as a rotary encoder E1 is inputted to the down terminal of the counter Q1, which counts down to zero eventually. When the point of an operation start is set logically with the signal of the timing generating circuit Q5, the switch circuit S1 is opened and closed automatically through the respective circuits Q3-Q5. |
