Influence of Manufacturing and Assembly Defects and the Quality of Materials on the Performance of an Axial-Flux Switched Reluctance Machine

Abstract

This paper investigated the influence of manufacturing and assembly defects and the quality of materials on the performance of an axial-flux switched reluctance machine (AFSRM). An AFSRM drive was designed and built for the in-wheel propulsion of an electric scooter. The motor was tested according to the standard IEC 60349-Part 1, but the obtained results were below the expected result. The causes of the discrepancy between the simulated and experimental results were analyzed. After an exhaustive study, manufacturing and assembly deficiencies and the quality of materials were identified as the main causes of the mentioned discrepancies. Static torque was used to assess the impact of the different causes in these discrepancies. Finally, some recommendations are proposed to improve the construction of this kind of machine.

Design of a Novel Modular Axial-Flux Double Rotor Switched Reluctance Drive

“…If the phase resistance is neglected and the aligned magnetization curve is approximated by two straight lines, OD with a slope Lau, and DB parallel to the unaligned magnetization curve also a straight line, OA, with a slope Lu [15]. The current between points A and C is flat-topped and has a value of IB, being C the point where solid state switches turn-off in which flux linkage, ψs, is equal to kd Las IB, being Las the saturated inductance, slope of the straight line OB, and kd the magnetic flux linkage ratio.…”

“…The current between points A and C is flat-topped and has a value of IB, being C the point where solid state switches turn-off in which flux linkage, ψs, is equal to kd Las IB, being Las the saturated inductance, slope of the straight line OB, and kd the magnetic flux linkage ratio. If the phase resistance is neglected and the aligned magnetization curve is approximated by two straight lines, OD with a slope Lau, and DB parallel to the unaligned magnetization curve also a straight line, OA, with a slope Lu [15]. The current between points A and C is flat-topped and has a value of I B , being C the point where solid state switches turn-off in which flux linkage, ψ s , is equal to k d L as I B , being L as the saturated inductance, slope of the straight line OB, and k d the magnetic flux linkage ratio.…”

“…Recently, Lin proposed a variation of the output equation for this type of machine [10] and Torkaman et al [11] provided a review of the design of AFSRM including a comparison, considering the assessment of some performance indices among different topologies. This paper proposes a new procedure, taking into account saturation, for the sizing of a particular type of an AFSRM with an inner stator and two exterior rotors that have a new distribution of the stator and rotor poles resulting in short magnetic paths with no flux reversal that have been presented in [12][13][14][15][16]. The machine has been built modularly with stator and rotor poles made with SMC parts.…”