New Technology for Elevator Drive System

T Mine

Friday 1st May 1992

Using the one-chip microcomputer and IGBT, we have considerably increased the compactness of our control circuit and reduced the electromagnetic noise with a high switching frequency. As for the control circuit, we have reduced it by another 20%. We have also removed the need of AC Reactor which was previously used for noise reduction and at the same time, reduced the noise inside the machine room by another 4dB.

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