| 摘要 |
PURPOSE:To obtain high accuracy and to expand the range of delay angle control, by digitally computing the control delay angle from the sample data of a preset imput, a detected rotary speed value, a detected current value, and the like, and controlling a three phase switching element by using three timers. CONSTITUTION:The DC motor 5 is controlled through a thyristor converter 4. The phase voltages of a three phase power source part 7 are made to be line voltages in a synchronizing signal detecting part 8, and the data 6, which is converted into a ''0'' and ''1'' signal, is imparted into a control part 2. Measured values at a tachogenerator 6 and a current detector part 9 are written into the control part 2, and a time delay angle is computed. The computed values are converted into times by the control part 2 and the times are set in the specified timers in three control angle timer parts 10. The timer parts 10 start counting by the next syncrhonizing signal from the detecting part 8. The control part 2 stores the ON and OFF data after the control delay angle. The timing up of the timer 10 is judged by the control part 2. The stored ON and OFF data of the gate is retrieved and imparted to a gate pulse amplifier 3, and the range of the control delay angle can be expanded. |
