Characteristics and Performance of an AFPM Generator Design Using Coin-Shaped NdFeB Magnets

This experimental study examines the characteristics and performance of an Axial Flux Permanent Magnet (AFPM) generator using a 3 x 25mm neodymium-iron-boron (NdFeB) coin-shaped magnet. Coin magnets have high flux and are easily available in the market. In the installation, the magnets are mounted in layers on the rotor disc made of acrylic as a substitute for iron material. The goal is to reduce magnetic reluctance and eddy current losses, which impact increasing the magnetic flux and generator output voltage. The method used is experimental testing by measuring the generator output voltage without load and load. The results showed that the performance of the AFPM generator with four layers of coin magnets could increase the output voltage of the generator. In addition, testing the output voltage with variations of the stator coil is also carried out. In testing the generator with four layers of coin magnets, the output voltages are 4.88 Volts (43 turns), 6.1 Volts (86 turns), and 16.76 Volts (172 turns).