Potential Analysis of Iron Nitride Magnets in (Hybrid) Variable Flux Machines

The novel magnetic alloy iron nitride is investigated both theoretically and with regard to its applicability in (hybrid) variable flux machines ((H)VFM). A review on these machine topologies is given, to contextualize the presented work. An approach to calculate current dependent demagnetization and re-magnetization maps with reduced computational effort is presented. The underlying algorithm uses the data stored per mesh node. A layer topology machine is used to compare the novel magnet material to conventional VFM and also investigate its use in HVFM. Three machines with similar performance are compared with regard to their ability to de- and remagnetize during operation.
The presented de- and remag map calculation approach works for both VFM and HVFM and reduces the time required for the maps’ generation. The novel magnet material iron nitride gives a promising outlook for rare earth free drive systems.