Evaluation of boarders of parametric resonance excitation for electromechanical commutator system with distributed load

Stability loss conditions for electromechanical commutator (EMC) with time-variant stator-rotor winding inductance and distributed load are studied. The first parametric resonance conditions for EMC with different loads are derived by one-frequency approximation using finite-element frequency model for long electric line. Example of calculation and numerical simulation experiments based on actual technical data are presented.