Performance Comparison of Outer and Inner Rotor Flux Reversal Machine for Direct Drive Application

Abstract

This paper compares the inner and outer rotor flux reversal permanent magnet machine (FRPMM) for direct drive applications. The flux reversal permanent magnet machines (FRPMMs) are receiving attention and are considered attractive for various domestic and industrial applications as compared to the conventionally used machines. These machines offer uses in multiple fields. The outer and inner rotor FRPMMs Electromagnetic performance investigation is carried out using 2-dimensional finite element analysis (2D-FEA). The analysis is done under the same conditions, materials, and parameters. After analysis it is concluded that outer rotor FRPMM has better torque density, more stability and lesser noise in comparison to inner rotor FRPMM. The open circuit flux of outer rotor FRPMM has a 295.78% higher peak value than the inner rotor FRPMM. The average electro-magnetic torque and power at 400 rpm of the outer rotor design is 281.39% that of the inner rotor machine. The performances obtained by the outer rotor machine topology in inductance analysis are also superior to that of the inner rotor.