Abstract
This paper proposes high-precision locating technology for high-speed & heavy load electric rail trolley in automatic port. Smooth starting/braking and precise positioning is necessary for power-driven rail trolley. This paper presents the soft start scheme and the “double stop” scheme in braking process. In the first stop process, the trolley speed is reduced using variable frequency speed control system. For the second stop process, mechanical braking is adopted for precision locating. Considering wheel-rail adhesion, the trolley braking acceleration is determined. Analysis shows soft start is able to achieve balance between acceleration and running stability of trolley, and “double stop” scheme can not only stop stably, but also achieve precise locating.
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