Abstract
In this paper, a new equivalent magnetic network(EMN) model is established for a spoke-type permanent magnet(PM) vernier(PMV) machine. Two different modeling methods are proposed for different parts of the PMV machine, considering that their magnetic field distributions are quite different. Hierarchical modeling method is proposed for the modeling of the rotor as the magnetic intensity of the rotor iron core presents gradient distribution along the radial direction. Mesh based reluctance network method is used for the modeling of flux modulation poles with irregular and unstable magnetic field distributions. Moreover, accurate PM leakage permeance calculation formulae are deduced to improve the simulation precision. The electromagnetic parameters, such as flux linkage, back electromagnetic force, electromagnetic torque and iron loss are predicted by the proposed EMN model. Finally, finite element analysis(FEA) and experimental results are given to verify the effectiveness of the proposed methods.
Highlights
Permanent magnet(PM) vernier(PMV) machines have received increasing attention in wind power generation and direct-drive applications due to their inherently low speed and high torque characteristics [1,2,3,4]
Due to the multipole and spoke-type arrangement of the PMs, this machine suffers from serious PM flux leakage, tooth-tip flux leakage and complex flux distribution in fluxmodulation poles (FMPs), which greatly increases the modeling difficulty of equivalent magnetic network (EMN) methodology
The EMN models of salient pole machine and spoke-type PM machine can be used as a reference, as the two types of machines and the spoke-type FTPMV machine have similar topology
Summary
Permanent magnet(PM) vernier(PMV) machines have received increasing attention in wind power generation and direct-drive applications due to their inherently low speed and high torque characteristics [1,2,3,4]. In [14], a novel calculation method for air-gap permeance and tooth tip permeance was proposed. As this method cannot be applied to on-load condition and no-load condition at the same time, separate EMN models were built for the two working conditions, indicating that the modeling solutions for PMV machine were not mature enough. In [6], EMN models were built for a mutually coupled linear switched reluctance machine and a surface mounted linear PM machine, in which piecewise linearization method was adopted to calculate the air-gap permeance by introducing overlapping coefficient of translator teeth and stator teeth. The impact of local magnetic saturation on simulation accuracy was studied in [17], where results show that the errors under various areas of saturation regions were changed from
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