| 摘要 |
PURPOSE:To eliminate the flow of an abnormal current to an inverter by gradually decelerating a generator while stopping the effective power reversely flowed to an inverter side when the motor becomes a generator when the power is interrupted. CONSTITUTION:When the power interruption of a power source 1 is detected by a detector 6, control means 14 operates to lower the output frequency of an inverter 4. Since a motor 5 continuously rotates by the inertia, it becomes a generator this time, a detector 15 for reversely feeding power to the inverter side detects the effective power of the reverse power, and when it is the prescribed limit or larger, a regulator 16 is driven to feed the control output to the control input of a control valve 12. Thus, the speed of decreasing the output frequency of the inverter by the control means 14 is alleviated. The motor 5 generates a voltage, but does not regenerate the power, and decreases its speed by the mechanical loss of itself. |
