| 摘要 |
PROBLEM TO BE SOLVED: To open/close a door even if a boost trap capacitor has discharged, without complicated control, when boost trap capacitor is used in the main circuit of a door motor for controlling the opening/closing of the door of a car of an elevator device.SOLUTION: A door control part comprises: a voltage command operation part 5 that outputs a modulation voltage command of three-phase modulation system and lower 120-degree conduction two-phase modulation system; an inverter part 8 that controls a door motor 2; and a modulation system switching part 7. The inverter part 8 controls the door motor 2 in correspondence with output from the voltage command operation part 5. The modulation system switching part 7 includes: the function of switching from the three-phase modulation system to the lower 120-degree conduction two-phase modulation system when detecting the finish of discharge of a boost trap capacitor 26 after a car 1 stops; and the function of returning to the three-phase modulation system when detecting the first opening/closing of a door 10 after switching to the lower 120-degree conduction two-phase modulation system.SELECTED DRAWING: Figure 1 |
