OPTIMIZATION OF MAGNETIC FLUX IN ELECTROMAGNETIC VIBRATING GENERATORS
Recent development in manufacturing of rare-earth permanent magnets provides a large variety of their shapes and magnetic properties. Ring shaped permanent magnets, mainly FeNdB magnets with high magnetic flux density (1.5 T), are frequently used for the construction of electromagnetic vibrating power generators for example in battery electric vehicles. The key parameter for optimal construction is the efficiency of power conversion which characterizes how effectively vibrating power generator converts kinetic energy into electric energy and stores it in batteries. The presented contribution brings an overview of concepts which increase this efficiency: 1) magnetic structure of axial magnets with like-poles facing each other incorporating soft magnet spacers; 2) cylindrical Halbach array magnetic structure; 3) outer magnetic shield structure for the concentration of magnetic flux. In the experimental section is also introduced constructed prototype of electromagnetic vibrating power generator and measurements of induced voltages.