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This paper studies hidden oscillations appearing in electromechanical systemswith and without equilibria. Three different systems with such effects areconsidered: translational oscillator-rotational actuator, drilling systemactuated by a DC-motor and drilling system actuated by induction motor. Wedemonstrate that all three systems experience hidden oscillations in sense ofmathematical definition. But from physical point of view in certain cases it isquite easy to localize there oscillations.

Hidden and self-excited attractors in electromechanical systems with and without equilibria