The AC asynchronous motor variable frequency speed regulation system based on digital signal controller is introduced. Combining the advantages of symmetrical regular sampling method and asymmetrical regular sampling method, the vertex sampling asymmetrical regular method is proposed to achieve it. This method has the characteristics of less distortion of asymmetrical regular sampling method and less sampling times of symmetrical regular sampling method, and the experimental waveform is good. This design has been cooperated with the manufacturer and applied to related projects of rail transportation.
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