| 摘要 |
PURPOSE:To accurately control a thyristor inverter by setting a component corresponding to the commutation superposing angle of control input signal based on a load current, a commutation power voltage and frequency, thereby correcting the variation in the superposing angle due to the variation. CONSTITUTION:A control circuit which operates a commutatorless motor 10 with a separately-excited inverter 18 is formed of electromotive force calculating element 30, magnetic flux calculating element 32, 34, phase control elements 56a- 56c, 58, 60 and an amplitude limiter 44 which inputs commutation superposing angle and a component corresponding to the allowable commutation angle. At this time, the DC current and the commutation power frequency and signals obtained through regulating resistors 52, 64 are inputted to a multiplier 62, the absolute value of the DC electromotive voltage is calculated from the output of the multiplier 62 and the outputs of the elements 30, 32, 34, the output obtained via regulating resistor 68 is inputted to a divider 70 and is applied to the amplitude limiter 44. Accordingly, the allowable commutation angle can be maintained constantly to the variations in the current, frequency and voltage, thereby enabling the operation in high power factor. |
