Measurement if the Magnetic Field Generated by a Disc with Embedded Magnets

This work is focused on the design and fabrication of magnet discs for electromagnetic microgenerator. The principle of operation of this type of microgenerators is based on the induction of current in the coils under the influence of alternating magnetic field. A disk with permanent magnets was used to generate such a field. In order to initiate its rotary motion and to investigate the effect of electromagnetic induction, the disk was mounted on the rotor of BLDC (BrushLess Direct-Current) motor. The research presented in this paper is connected with the measurement of the influence of the positioning of magnets on a wheel disc as well as the direction of the magnets on the produced magnetic field. For this purpose a suitable measuring system was constructed. The magnet discs were mounted on the rotor of the stepper motor, while the magnetic field was measured with the LZ-642 magnetic field meter. The influence of positioning, dimensions and magnetization of the permanent magnets placed in the disc on the magnetic field was measured and simulated.