Current of the Parametric Electromagnetic Synchronous Oscillating Motors.

New analytic expressions for the coil currents of the parametric synchronous reactive oscillating motors are obtained. The movable ferromagnetic armature was assumed to be in a harmonic mechanical duty and the motors to be fed with pulsative or alternative voltages, with rectangular and sinusoidal wave forms. The deduced formulas become sufficiently simple in practical situations. Numerical calculations, effected with a Felix 256 computer, have spotlighted interesting conclusions: small variation of the conducting angle with the nature of the charge; necessity of increase of the mains voltages to the beginning of their alternances; important distortion of the current wave form with the increases of the modulation coefficient of the motor coil inductance.