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Frequency converters are used today in a large extent in the industry, while they allow continuous regulation of the rotation speed of the induction motor. There are different families of the frequency converters on the market. The simple ones allows only U/f control, and very simple changes in the control structure, the complex ones have also vector control and direct moment control and their control structure can be changed significantly. User can affects number of parameters (thousands) and achieves very various quality of the drive.