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This video inaugurates a series on the speed variator for three-phase asynchronous motors. How to choose it, how to integrate it into an electrical circuit? How to program it? This first video is devoted to the operating principles of the speed variator. We take as an example and common thread of this video series the adaptation of a variator in the electrical circuit of a drill press. How to integrate it to be able to vary the rotation frequency of a drill press, without having to change the position of the belts filmed at the high school la fontaine des eaux for the BAC PRO MEI and BAC PRO ELEEC training courses