| 摘要 |
PURPOSE:To stably operate an induction motor by providing a slip variation amount detector for comparing the output of a voltage controller with that of an input current converter, thereby suppressing an unstable phenomenon that occurs at low inertial load time. CONSTITUTION:The voltage and the frequency of an inverter are controlled through an acceleration/deceleration rate circuit 10 for suppressing the change rate of the frequency by a frequency setter 9 for setting the output frequency of an inverter 5. A slip variation amount detector 20 for comparing the output of a voltage controller 15 with that of an input current converter 16 is provided, and the output is added to the output of the rate circuit 10, and the frequency of the inverter in controlled as the input of a voltage/frequency converter 11. |
