Electrical-Magnetic-Mechanical Modeling of a Novel Vibration Shaker Based on a Rotary Permanent Magnet

For conventional electromagnetic vibration shakers, a large and steady electromagnetic field is needed to generate the electromagnetic drive force, which leads to the overheating of coils and a large energy consuming. In this paper, a novel electromagnetic shaking mechanism that can be linearized is proposed based on a rotary permanent magnet driven by the electromagnetic field, in which a conjugate equal-diameter cam of a special profile is adopted simultaneously. By applying the novel mechanism, the steady electromagnetic field is no longer necessary and thus the energy consumption can be reduced. Considering of the coupling effects of electricity, magnetism and mechanical dynamics, a hybrid analytical-FEM method, therefore, is introduced to meet the demand for accurate modeling of this complex electrical-magnetic-mechanical system. The method also takes into account of the effect from electromagnetic field inhomogeneity. Finally, a comprehensive nonlinear model is built, and its performance is then verified by giving varied sinusoidal inputs in terms of different amplitudes and frequencies. It indicates that the electric-magnetic-mechanical coupling drive mechanism can be linearized in specific conditions, and the driving behaviors could be predicted and valued, which will be a theoretical guidance for the shaker's optimal design and the experimental investigation in the coming research.