| 摘要 |
PURPOSE:To prevent the production of any operation noises in attraction and reset operations and obtain a vibration proof effect, by a method wherein a clock signal is frequency-divided to form a plurality of timing signals having respective duties properly different from each other, and the voltage applied to the solenoid is changed over in accordance with the signals. CONSTITUTION:A counter 1 frequency-divides a clock signal CK to form signals A, B, C different from each other. Output lines 2A, 2B, 2C of a CPU2 for controlling the drive of a solenoid 3 control ON-OFF of AND gates G3, G4, G5 for specifying the drive of 1/8, 1/4, 1/2 duties, respectively. In driving the solenoid 3, the controller 2 successively changes over the duties, 1/8 1/4 1/2 1/1 1/2, to raise the voltage stepwisely. Thereafter, in the hold state of the solenoid 3, a signal is delivered to the output line 2C to specify the solenoid 3 to be driven by the 1/2 duty. On the other hand, in the shutoff operation of the solenoid 3, the duties are changed over reversely to the above, 1/2 1/4 1/8, to lower the voltage stepwisely, and the output lines of the controller 2 are changed over as follows: 2C 2B 2A. By this control, it is possible to obtain voltage characteristic similar to that shown in the Figure. |
