International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

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.

In presented contribution two types of glass-metal bond are investigated by scanning electron microscope (SEM) equipped with EDS. Firstly, a mechanical bond, which usually provides weaker random joints. Secondly, chemical interaction, where the oxide layer on the metal surface forms a strong bond with the glass. Additionally magneto-impedance measurements are used to determine surface magnetic properties of microwires with and without glass cover. Considering giant magneto−impedance (GMI) effect, which is mainly a surface effect at higher frequencies, is very sensitive to the rotation of magnetization in the shell of a microwire. Thus GMI measurements are often used to determine magnetic anisotropy, hysteresis and residual magnetic domain structure formed around local defects (pits) on the surface of amorphous ferromagnetic microwires.