| 摘要 |
PURPOSE:To remove a beat phenomenon based on the difference of frequency, by eliminating ripple components synchronizing with frequency at the load side contained in current return signals in a current control type frequency converting device. CONSTITUTION:A comparator 12 provides a power rectifier 2 with deviation between the currents of an armature of a synchronous motor 5 detected by means of a current transformer 8, a rectifier 9 and a resistor 10 and current reference 11 through a current control amplifier 13, a phase controller 14 and an ignition control circuit 15. A voltage ripple detector 31 detects voltage ripple applied to a direct current reactor 3 for smoothing, and a current ripple detector 32 operates current ripple components from voltage ripple and supplies the comparator 12 with the components. |
