| This article studied one kind stepping motor segmentation velocity modulation control system in view of the present domestic product track locomotive some questions which exists in the speed control,. this system integration rate is high and the reliability is good. It has the tangible effect to enhanced the track performance of locomotive .This article introduced the principle of work of three kinds stepping motor (equation, static type and mixed style step-by-step electrical machinery), has analyzed its two kind of control system (open-loop control and closed-loop control), discussed three kinds system plan to stepping motor to commonly used segmentation velocity modulation, designed using the DSP module has stepping motor to subdivide the velocity modulation plan, and established mathematical mode of the stepping motor on foot response characteristic, established its modulation system of segmentation velocity, using the MATLAB/Simulink software the precise simulation analysis model, and conducted the analysis research in the simulation analysis model foundation to its each kind of performance characteristic Indicated after the analysis and the experimental result that, this actuation system has the superior performance, may cause the locomotive diesel engine steady vertical speed, the reduction of speed or stabilizes in under the rotational speed which some one assigns moves, thus realization motive smooth velocity modulation. In addition, stepping motor pulse segmentation actuation system structure based on the DSP control three-phase mixed style to be simple, the control precision is high, the performance is fine, but also may apply in at present popular each kind of textile machinery and the high accuracy numerical control engine bed and so on.
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