Abstract
The paper is aimed at a 3D magnetic equivalent circuit (MEC)-based modelling of claw pole synchronous machine topologies. Beyond the magnetic saturation and the armature magnetic reaction, the proposed modelling approach takes into consideration the rotor position variation, yielding the so-called: rotor position-dependant MEC. Accounting for the complexity of the magnetic circuit of claw pole topologies, specific assumptions are adopted prior a general analytical derivation of their MEC models. The developed analytical approach focuses on the air gap reluctance under variable rotor position considering a simplified geometry of the claw. A dedicated numerical procedure based on the Newton-Raphson algorithm is proposed for the resolution of the designed rotor position-dependant MEC. The proposed approach is applied to three claw pole topologies. The two first ones are equipped with a single source of excitation achieved by a field. Their analytically-predicted features are validated by experiments. The third topology has a dual excitation achieved by a field and permanent magnets (PMs) in the rotor. Its analytically-predicted features are validated by 3D finite element analysis (FEA). It is found that both experimental and FEA results are in quite good agreement with the analytical predictions yielded by the proposed rotor position-dependant MEC.
Highlights
T HE modelling of electric machines based on their magnetic equivalent circuits (MECs), called lumped circuits, has been widely used [1], [2]
The paper was aimed at the MEC modeling of three claw pole machine (CPM) topologies, namely: (i) a conventional claw pole machines (CPM), (ii) a stator-excited CPM, and an inter-pole permanent magnets (PMs) hybrid excited CPM
The validity of the proposed models has been extended to the investigation of the time-varying features thanks to the incorporation of the rotor position variation
Summary
T HE modelling of electric machines based on their magnetic equivalent circuits (MECs), called lumped circuits, has been widely used [1], [2]. The developed MEC takes into account the rotor slots’ skewing, the stator end windings, the slot leakage flux, and the magnetic saturation. This great interest is motivated by several advantages especially their heteropolar structure that enables the integration of high number of poles in a low volume This said, CPMs suffer from some drawbacks, as: (i) the use of the brush-ring system which penalizes the machine compactness and reliability, (ii) the high leakage flux taking place between adjacent claws which compromises the torque production capability, and (iii) the high iron loss at high speeds especially those taking place in the rotor. The proposed 3D MEC modelling approach is applied to the prediction of the no- and on-load static and time-varying features of (i) a conventional CPM, (ii) a stator-excited CPM, and (iii) an IPM-HECPM
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