Dynamic stability of a double-supply engine under oscillating conditions

The dynamic stability research of electric motors with oscillating motion is oriented towards the definition of utmost disturbance values upon which the electromechanical system restores the established quasi-synchronous power setting. A sudden increase or drop of load, self-rocking, short circuit, and so on act as such disturbances. All these processes have an obviously dynamic nature, where /spl omega/(t) rate and X(t) coordinate for a moving element of an actuating motor are unknown and variable quantities. A precise definition of the latter is connected with the solution of the full system of nonlinear differential equations describing a general motor mathematical model under the bi-harmonic control, but this leads to some difficulties. Dynamic stability problems can be more easily studied with a double-supply engine. This issue is discussed by the authors.