| 摘要 |
PURPOSE:To reduce the capacity of a continuously operating variable voltage and variable frequency power source by drawing-in an AC motor to the power source after starting the motor additionally operated by a starting variable voltage and variable frequency power source. CONSTITUTION:In case that another induction motor 5 is started when induction motors 1-3 are operated at the same speed by a continuously operating variable voltage and variable frequency power source 7, a contactor 8b is closed, and the motor 5 is started in low frequency by a starting variable voltage and variable frequency power source 9. When the motor is completely accelerated to reach the continuously operating frequency, a contactor 8b is opened, a contactor 6e is closed to draw-in the motor to the power source 7. In this manner, the capacity of the power source 7 can be reduced. |
