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Cyclic voltage fluctuations can be considered as a superposition of the fundamental voltage component, subharmonic and interharmonic components – that is the components of frequency less than the fundamental one or not being its integer multiple. A commonly occurring case of voltage fluctuations is square voltage modulation. This paper deals with the effect of square voltage modulation on the rotational speed of an induction motor. The results of the FEM computations are presented for a cage induction motor with a rated power 3 kW and various parameters describing the voltage modulation.