Multiple Layer Magnetic Materials for Variable Flux Permanent Magnet Machines

This paper investigates the potentialities in simultaneous compaction of different types of permanent magnet materials, in order to build multi-layered magnets for electrical machine application. In particular, bonded magnet and hybrid magnet powders are used for building two-layer samples, which pave the way for the construction of special electrical machines having complex shapes, such as the variable flux permanent magnet machines. In this study, samples of innovative double layer magnet are built by means of single press and next magnetization procedure. Then, the ‘layered’ magnets have been experimentally characterized, focusing the attention on two diverse arrangements: the so-called parallel and series configurations.