| 摘要 |
PURPOSE:To achieve high speed and improved efficiency by starting at a low speed, accelerating while detecting a load state, reducing the speed by a specified amount when the load state becomes nearly out of step, and by driving at a high-speed through region. CONSTITUTION:A reference address is changed to a higher address for each specified time by a CPU 5 and a driving frequency which is given to a stepping motor 2 is increased at a lapse of time, thus enabling the stepping motor 2 to be driven in accelerate state. On the other hand, when either one of a differential voltage consisting of a difference of both voltages goes below a specified value as acceleration continues, it is determined that the state is immediately before being out of step, thus returning to an address which is one address before an address where a drive frequency is recorded when that determination is made and taking out data by referring to a timer data of this address. This data is output to a driver unit 9 and the stepping motor 2 is subjected to constant-speed drive at a high-speed through region by a drive frequency which is generated based on data by the driver unit 9. |
