Hybrid Excitation Flux Switching Motor with Permanent Magnet Placed at Middle of Field Coil Slots Employing High Filling Factor Windings

Abstract

Design and experimental studies on Hybrid Excitation Flux Switching Motor (HEFSM) applied to a traction motor for hybrid electric vehicles are presented. A stator body of HEFSM generally consists of not only laminated core and three-phase armature coils, but also field excitation coils and permanent magnets as field mmf sources. Therefore, each material used in the stator body should be designed properly with the purpose of performance improvements such as efficiency, power and torque densities, cost and so forth. The configuration and the arrangement of all coils are examined to increase their filling factor for reducing copper losses. Moreover, thinner electromagnetic steel and permanent magnets with high remanent flux density are employed to achieve higher efficiency. Experimental tests using a prototype of HEFSM validate the design results.