Control apparatus and control method for passenger conveying machine

Abstract

The invention provides a control apparatus of a passenger conveyor and a control method which can effectively reduce the impact to an induction-motor when source transfer in a simple and low-cost structure, and can prevent the occur of noise and shake. A star-delta start the same as the starting running is made when the source is transferred for the induction-motor, the provisional connection of the induction-motor is star connection and then transfers to a delta connection. The induction-motor is supplied power provisionally by the starting resistance or the starting choking coil when the source is transferred for the induction-motor, and then the power is supplied by winding off the starting resistance and the starting choking coil.

Description

technical field [0001] The present invention relates to a control device and a control method of a passenger conveyor, which move circularly connected multi-stage steps to transport passengers riding on the steps, and particularly relate to reducing the power switching time of an induction motor used to move the steps Shock technology. Background technique [0002] In passenger conveyors such as escalators and moving walks, it is sometimes necessary to be able to switch the operating speed. This kind of passenger conveyor that can switch the operating speed uses a conversion device such as an inverter to convert the three-phase AC from the commercial power supply into a three-phase AC with variable voltage and variable frequency, and provides power to the induction motor used to move the steps. A three-phase AC whose frequency is lower than that of a commercial power supply performs low-speed operation. In addition, when switching from low-speed operation to high-speed ope...

AI Technical Summary

Problems solved by technology

That is, the control device described in Patent Document 1 adopts a configuration in which the synchronization of the frequency is detected by the synchronization detection device to switch the power supply, so the device itself is complicated and expensive.

In addition, since the control device described in Patent Document 2 is configured to provide a dead time until the residual voltage of the induction motor drops, it is very difficult for passengers to adjust the time between the time required for the residual voltage of the induction motor to drop and the dead time. The balance between the time when the speed change of the conveyor does not become large, for example, if the empty time is short, the impact is large, and conversely, if the empty time is long, the speed of the passenger conveyor changes, etc.

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