| 摘要 |
PURPOSE:To cope with the aging change of a motor by using the output of a PLL circuit as an ideal voltage, automatically setting a parameter for controlling the rotating speed of the motor due to the individual difference of motor characteristics each time a power is applied. CONSTITUTION:The output signal of a PLL circuit 12 is compared with a reference voltage set from reference voltage generating means 15 equal to the ideal output voltage of the PLL circuit 12 by comparison regulating means 16, and the result is output to a gate 17. It is input to one of the analog switch 172 of the output of the comparison regulating means 16. A signal from a timer started by the application of the power is input to the other input. The analog switch 172 receiving the two inputs outputs a signal, which is held in latch means 18. Variable resistance means 20 in parameter setting means 13 varies a resistance value in response to the held voltage signal to set a parameter. |
