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Linear Synchronous Motors, 2nd Edition by Bronislaw Tomczuk, Zbigniew J. Piech, Jacek F. Gieras

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9

Building and Factory Transportation Systems

9.1 Elevator Hoisting Machines

Hoisting technology started when Archimedes constructed the first elevator that was based on pulleys and winches around 236 BC. However, early primitive elevators did not guarantee any safety for passengers. The situation changed with E. Otis’ invention of a reliable safety gear in 1853 [P1]. In the first elevators, the drum was used to collect the rope. The major disadvantage was the necessity to lift the load together with the supporting structure. The next type, referred to as a rope traction elevator, has been constructed in such a way as to obtain the load balanced by the counterweight. This latter construction is widely used today.

Elevators can be classified ...

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