Electric Corporation again used variable frequency drive systems

In 1974, Otis installed a 200m moving walkway at Amsterdam International Airport in the Netherlands. It was the longest moving walkway in Europe at the time.


In 1975, the CN TV Tower was built in Toronto, Canada. It is the tallest free-standing building in the world. The tower is 550m high and is equipped with 4 special glass-walled sightseeing elevators from Otis.
7In July 1976, Fujita of Japan developed a DC gearless traction elevator with a speed of 10.00m / s.
In 1977, Japan's Mitsubishi Electric Corporation developed a SCR-Leonard controlled gearless traction elevator.


In 1979, Otis developed the first microprocessor-based elevator control system Elevonic 101, which put the elevator electrical control into a new era of development.


In 1980, Otis released a computer program called Otis Plan, which helps architects determine the optimal configuration, speed, and number of elevators for new or renovated buildings.
In 1983, Otis developed OTISLINE ?, which is a computer-based call service system 24 hours a day.
In 1983, Mitsubishi Electric Corporation developed the world's first elevator with variable voltage and frequency drive. In 1990, Mitsubishi Electric Corporation again used variable frequency drive systems for hydraulic elevators for the first time.


In 1985, Mitsubishi Electric Corporation developed a spiral escalator running in a curve and successfully put it into production. Spiral escalators can save building space and have decorative art effects.
In February 1988, Fujita applied the fuzzy theory and artificial intelligence technology to develop the elevator group control management system "FLEX8800" series commercialized.
In 1988, Otis released REM ?, a computer diagnostic system that can remotely monitor elevator performance. In 1995, Otis introduced REM Ⅲ, ​​which is Otis's most advanced remote elevator monitoring system. The elevator handrails remote monitoring system has gradually become a means for major companies to improve their services.
In 1989, Otis launched a machine-roomless linear motor-driven elevator in Japan.
In 1991, Mitsubishi Electric Corporation developed a large lifting height escalator with an intermediate horizontal section. This multi-slope escalator can reduce passengers' fear of height when the height is large, and can be coordinated with the stair structure of the building.