Research on Combinations of Primary and Secondary Pole Numbers for Linear Switched-Flux PM Machines with Odd Pole Number of Primary

摘要

Based on a simple analytical model,combinations of primary and secondary pole numbers for linear switched-flux permanent magnet (LSFPM) machines with odd pole number of primary are compared,with respect to back electromotive force (EMF) and electromagnetic thrust force.The winding configurations are also determined according to the coil-EMF vector diagram.Two important design parameters,secondary pole width and split ratio,are optimized by finite element analysis (FEA) to acquire larger thrust force when winding copper loss is fixed.Some basic electromagnetic performance is compared in LSFPM machines with 9 primary poles.It is shown that the secondary pole number should be close to the primary pole number and the higher secondary poles can lead to a better performance.