Oscillating synchronous linear motor in electromechanical resonance

The symmetric double acting oscillating synchronous linear motor with longitudinal functional air gaps is very well suited to the system synthesis of the electronically controlled drive for working resonant machines used in industrial vibrational techniques. It can be designed for a stroke of up to a few centimetres and a working frequency ranging from about 6 to 70 Hz. What is important in practice is the motor operation in electromechanical resonance with a compensated synchronising (AC) motor circuit and a compensated mechanical load. Then, the operational motor characteristics, derived under the assumption of harmonic oscillations, are functions of real variables. An analysis of these characteristics yields the features of a steady-state motor with harmonic oscillations. Attention is paid to the motor self regulation and the control of the velocity or path amplitude of its oscillations. The theoretical outcome, applicable also for the case of a not fully harmonic motor power supply from a static convertor, is in good agreement with the experimental results obtained from researching motor prototypes of 1 and 5.7 kW.