| 摘要 |
PURPOSE:To prevent the variation of line voltage in case of the drive of load by controlling field currents on the basis of the change of a power-factor of the synchronous motor. CONSTITUTION:A transformer 11 and a current transformer 12 are mounted on the midway of power source lines to the synchronous motor 1 branched from a system power source 100, and the power-factor is detected 13. On the other hand, system voltage is taken out through a transformer 7, a rectifier 8 and a filter 9, the voltage and the reference voltage of a reference voltage setter 10 are compared and voltage varying signals are generated. The voltage varying signals and the output of the power-factor detector 13 are added 14 and applied to a controlling width setter 5, and the currents of field winding 2 are controlled through a thyristor igniting device 4 and a thyristor device 3. |
