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A Critical Review and Investigation of Machine Room Less (MRL)Elevators

Akshay Pai, Nair R, George P and Subir S

Machine room less (MRL) elevator drives offer advantages over conventional traction drives such as a higher energy efficiency, low weight, and more design freedom and better utilization of hoist-way space. MRL drives have emerged as the superior choice in most high rise applications. Currently a majority of MRL drives are mounted on a guide rail spanning beam which forces safety and stabilization components to act as load bearing component and degrades ride quality. The MRL drives are also difficult and costly to inspect and maintain if located in such a configuration. Alternate methods of mounting MRL drives on hoist-way spanning I beams if utilized can eliminate eccentric hauling leading to better utilization of guide rails and an improved ride quality. A hoist-way spanning support configuration also aids in decreasing inspection and maintenance costs by improving ease of access and increasing safety. Thus a properly located MRL drive can provide best possible operating parameters for a high rise application with lower costs of inspection and maintenance over the elevator lifetime.