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| The Design of Asynchronous Motor Soft Starter Based on Discrete Variable Frequency |
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| DOI：10.11980/j.issn.0254-508X.2016.12.010 |
| Key Words:asynchronous motor soft starter discrete variable frequency current-sensing |
| Fund Project:西京学院科研基金项目(XJ150213)。 |
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| Abstract:Aiming at the problems of asynchronous motor such as small starting torque, large starting current and can not starting heavy-load, a soft starter based on discrete variable frequency control method was designed. Firstly, the hardware of soft starter based on three-phase anti parallel thyristor main circuit and high performance DSP28335 was designed, the calculating the effective value of current using high speed A/D was realized. Then, the soft start control strategy based on discrete variable frequency was analyzed, the soft starting method of 7-4-3 frequency division to power frequency voltage regulation was presented and the discrete frequency software design was completed. Finally, the Matlab simulation and experimental results showed that the discrete variable frequency soft start method could effectively reduce the starting current at the same load rate, the efficiency of discrete frequency conversion was verified． |
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