| 摘要 |
PURPOSE:To simplify the constitution of a digital servo device without deteriorating the control accuracy and also to decrease as less as possible the mechanical adjustments, by using plural analog switches, relays, a switching transistor, etc. to constitute a motor driver. CONSTITUTION:A motor driver 3 is provided with relays R1, and R2, analog switches AS1-AS3, a switching transistor Tr33, etc. When conduction signals are applied to switches AS1 and AS3 from a latch 34, the relay R1 is energized. Then a contact piece 31 is closed and the Tr33 is repetitively turned on and off in a fixed pulse period and a fixed duty. Thus a forward current has pulse conduction to a motor 4. While a reverse current has pulse conduction to the motor 4 in the same way when the conduction signals are applied to switches AS2 and AS3 from the latch 34. Thus the forward and reverse revolutions of the motor 4 can be controlled accurately with control of data on the latch 34. In other words, it is possible to simplify the constitution and to decrease as less as possible the mechanical adjustments for a digital servo device without deteriorating the control accuracy. |
