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Background: The world’s first linear motor driven passenger elevator system MULTI ® started test operation at test tower Rottweil, Germany. A full scale showcase has been installed, the commissioning is finished and extensive testing activities are performed. The new test tower in Rottweil provides the perfect test and certification environment to get this ground-breaking product onto the market. The propulsion of the cars is based on an ironless long-stator linear motor with distributed active drive, motor and sensor elements. This technology allows cars to move individually in the same elevator shaft without any ropes. The same type of linear motor will also be used to exchange cars horizontally from one shaft to another. Herewith a movement of the cars in a loop or any vertical and horizontal travel path can be realized. The testing procedures to characterize the operation of the MULTI ® include measurements of electrical, mechanical and thermal quantities. Smart energy management feeds power of descending cars for rising cars. To overcome the high power demand for acceleration cars, an energy buffering system is installed. Aim: This paper focuses on the power and energy management of the MULTI ® demonstrator. The benefit of intelligent buffering strategy is depicted. Methods: Full scale prototype, numerical simulation, testing and measurement. Results: This paper presents first measurement results of the MULTI ® demonstrator mainly focusing on the power and energy characteristics of the propulsion system. Conclusion: Using an energy buffering system, the peak input power of the MULTI ® can be reduced to 50% of the peak power level without energy buffer. The power from downward moving cars is recuperated and used for upward driving cars, balanced by the energy buffer without stressing the grid.

MULTI® - rope-less elevator demonstrator at test tower Rottweil