Dsp-based Three-phase Asynchronous Motor Intelligent Soft Starter

The three phase asynchronous motor is most used in industry, agriculture, daily life and etc because of its simple structure, stable running, and lower price. With the quickly development of machines in production area, the more excellent start performance is desired. Conventional start methods can't fit the request for production because they have some limitation such as huge start current impact for the power network. To solve the above-mentioned problem, this paper presents a high performance soft starter based on TMS320LF2407 DSP. Compared with conventional starter, this soft starter can improve the performance of start of the asynchronous motor obviously. The content of this thesis is listed as follows: The first chapter includes the present status of soft starter, the purpose of studying the soft starter and this paper's main studying contents. The second chapter brings forward the soft start's advantages and explains the theory of soft start. The third chapter mainly introduces the hardware design of soft starter, including the main circuit, control circuit, drive circuit, and protect circuit and auxiliary switched power design. The forth chapter tells us the software design of soft starter, including the main program, closed loop subprogram and interrupt service subprogram design. The fifth chapter gives us the experiment waveform and data of control circuit;the emulational waveform of the main circuit is also presented.