A number of modern technological processes can be significantly intensified by applying vibratory excitation in a wide range of oscillation frequencies and amplitudes. In many cases, an electromagnetic vibration exciter (EMVE) may serve as the most effective source of vibration, especially at power levels up to several kilowatts and more; push-pull EMVEs developing a non-pulsating and sign-variable exciting force are considered to be the most appropriate ones. The excitation of self-oscillations in a system of two electromagnets connected according to a differential scheme, which allows the range of operating frequencies to be widened and the system power capacity to be increased, is analyzed. An equation describing the interaction between the EMVE mechanical vibration subsystem and the power supply system is given. A method for analyzing a dual-circuit self-contained electromechanical system (EMS) taking into account electromechanical links is developed. It is pointed out that during operation in the autonomous mode one stable state ensuring frequency stability is realized.

Drives with electromagnetic vibration exciters (EMVE) occupy an important place among the vibration machines used in various industries owing to their having a simple design and ensuring high vibration intensity. Rational designing of such devices needs a theoretical justification. An electromagnetic vibrator was theoretically studied, as a result of which regularities interrelating its electrical, magnetic and mechanical subsystems have been established, and the dependence of coil inductance on the gap x that takes into account the inductance modulation coefficient has been determined. Correlations describing periodic solutions in the form of series in powers of a small parameter µ have been derived. Equations using which the stability of periodic solutions can be determined in a first approximation have been obtained. By using the small parameter method, relations for the current in the coil have been derived, and the power consumed by the electromagnet has been determined.