This article describes a single chip microcomputer contorllign rig for the soft starting of squirrel-caged induction motor. It gives a detailed discussion of the system constitution of centering on the MCS - 51 single chip microcomputer, and thedesign project of organic integrating hardware with software. The experiment test have shwon that the rig has the features of simple structure, manipulation convenience, low cost, and running reliability.
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