Frequency Controlled Lift with Counterweighted Roped Hydraulic System

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.