Design of Automatic Saving Energy Device for Asynchronous Motor

The automatic saving energy device for asynchronous motor was designed according to load change of energy saving for reducing voltage and automatic tracking, and the principle of improved power factor. Controllable silicon module consists of three groups of unidirectional thyristor in counter parallel connection. The voltage, current and power factor of motor stator is detected real time by single chip microcomputer (SCM), and according to start up/run state of motor, judge if run subprogram or start up saving energy mode according to load change. SCM AT89C52 is used as control center of the system, and system software was compiled with C51.