| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost state storing device which is easy to mount without requiring any sensor for detecting the rotation of a motor. SOLUTION: This device is provided with a freely movable seat ST, a DC motor 11 which drives the seat ST, switching members 7 which give the driving instructions to the DC motor, and a controlling device 1 which drives the DC motor 11 by operating the switching members 7 to control the position of the seat ST. It is also provided with a motor rotation pulse generating circuit 3 which makes cut-off frequency fc variable based on the frequency of ripple pulses which indicate the rotational state of the DC motor 11. |
