| Summary: | 碩士 === 義守大學 === 電機工程學系 === 92 === The objective of this thesis is to investigate the dynamic simulations of the dc machines which are associated with a gentry crane for harbour container centre. Manipulation of a gentry crane for precisely positioning the container is a vital factor for the harbour container centre. It has to operate so fast in order to keep punctuality. Therefore, to place the container, cranes are always required to run forward and backward frequently, precisely and quickly. The major components in a gentry crane of a harbour container centre are the hoist and trolley. They are energised by dc marchines. This thesis first simulates their dynamic responses, such as lifting up and lowering down, speeding up and slowing down. Next, when the dc machines are operating in the regenerative braking mode, they will act as generators and feed a little active power back to the electric system. Such an operating mode will in turn cause terminal voltage rising up. Extensive computer simulations are executed to illustrate the phenomena, and are validated by the practical results which are obtained from the scene of the worksite.
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