Abstract
According to star graph and winding distribution, winding MMFs of three kinds of 12-slot/10-pole multi-phase and multi-layer winding layout are analyzed by the improved winding function method. Analysis results show that multi-phase and multi-layer winding can suppress even order and (12n ± 1) order harmonics, thereby reducing the eddy-current loss in PMs. Based on the unfolded LPMSM model, rotor MMF, air gap flux density, and no-load back-EMF are analyzed by the analytical permeance function method, which is validated by Teslameter and no-load experiment. Winding MMF is validated by FEM. An axial-flux integrated starting/generator (ISG) with double-three-phase four-layer (DTP-FL) winding, segmented armature and PM, and centrifugal fan is designed and manufactured. The no-load and load test with two groups of resistance established has validated the reasonability of the mentioned method. Experiments show that the axial-flux ISG prototype can run at a relative temperature rise.
Highlights
Axial-flux integrated starting/generator (ISG) has the advantages of compact axial space, fast start and stop characteristics, high energy recycling efficiency, strong auxiliary power, large power density, etc
Traditional or non-traditional fractional-slot concentrated-windings (FSCW) winding is widely used in induction machine, radial–flux, or axial-flux permanent magnet machine
Multi-layer and multi-phase FSCW windings were adopted to reduce eddy-current loss in PMs [5,6], eliminate air gap flux subharmonics and slot harmonic [7], improve torque density [8], or supply the ability of faulty operation [9], which realized the improvement of efficiency
Summary
Axial-flux integrated starting/generator (ISG) has the advantages of compact axial space, fast start and stop characteristics, high energy recycling efficiency, strong auxiliary power, large power density, etc. The winding layout analyzed by the star graph method (SGM) is studied to eliminate the non-torque components of winding MMF or reduce eddy-current loss in PMs [1,2,3,4]. Multi-layer and multi-phase FSCW windings were adopted to reduce eddy-current loss in PMs [5,6], eliminate air gap flux subharmonics and slot harmonic [7], improve torque density [8], or supply the ability of faulty operation [9], which realized the improvement of efficiency. Space harmonics of permanent magnet synchronous machine (PMSM) with traditional FSCW winding layout are rich. Based on the unfolded linear permanent magnet synchronous machine (linear PMSM) model at middle diameter, rotor MMF, air gap flux density, and no-load back-EMF are analyzed by analytical method. Load experiment platform is established to validate the proposed method and design scheme of axial-flux ISG
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