Frequency Controlled Lift with Counterweighted Roped Hydraulic System

Dieter Klitzke

Thursday 1st October 1998

Changes in the lift market have led to the development of new systems, which meet new demands such as: space (no machine room), power consumption, ride comfort, etc. A new concept for a hydraulic lift is presented that combines these requirements in a single system. A counterweighted roped hydraulic lift is driving by a differential cylinder. The power unit motor is not immersed in the oil and is driven by a frequency converter. The known advantages of hydraulic lifts can thus be increased to include high efficiency and the integration of the power unit and the controls in a single cabinet.

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