Analysis of the super high‐speed permanent magnet generator under unbalanced load condition

IEEJ Transactions Elec Engng

Cui

et al. 2019

Self Cite

Remanence and coercivity are important parameters to characterize the magnetic properties of permanent magnetic (PM) materials. The variation of PM parameters will lead to the variation of generator output performance. To find out the key PM parameter affecting generator output performance, a 117‐kW, 60 000‐rpm high‐speed permanent‐magnet generator is taken as an example and a 2D finite element model is established. By comparing the calculation results and the test data, the accuracy of the model is verified. By using the field‐circuit coupling method, the mechanism of nonlinear variation of output voltage with the change of load is revealed when the variation degree of remanence and coercivity is consistent. The sensitivities of no‐load electromotive force (EMF), output voltage at rated power, voltage regulation, and overload capability to the variations of PM parameters are studied. Furthermore, the mechanism of PM parameters affecting generator output performance is revealed. The results show that the sensitivity of generator output performance to different PM parameters is different and the influence degree of PM parameters on the generator output performance depends on the permeance of the main magnetic circuit. Finally, the basis for selecting PM parameters is given. The research can assist generator designers to select PM in the design stage. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Parameters and Model Of The Generatormentioning

confidence: 99%

“…Based on the above assumptions and electromagnetic field theory, the boundary value equation of generator two‐dimensional transient electromagnetic field is established in this article :

\{\begin{matrix} left \\ Ω : \frac{\partial^{2} A_{z}}{\partial x^{2}} + \frac{\partial^{2} A_{z}}{\partial y^{2}} = - μ J_{z} + μ σ \frac{\partial A_{z}}{\partial t} \\ Γ_{1} : A_{z} = 0 \\ Γ_{2} : \frac{1}{μ_{1}} \frac{\partial A_{z}}{\partial n} - \frac{1}{μ_{2}} \frac{\partial A_{z}}{\partial n} = J_{s} \end{matrix}

Section: Parameters and Model Of The Generatormentioning

confidence: 99%

Influence of permanent magnet parameters on output performance of a High‐speed permanent‐magnet generator

IEEJ Transactions Elec Engng

Cui

et al. 2019

Self Cite

show abstract

“…In order to simplify computational problems in electromagnetic field analysis, three hypotheses are proposed in this paper [14,15]:…”

Section: Parameters and Modelmentioning

confidence: 99%

“…Based on the above assumptions and electromagnetic field theory, the boundary value equation of a two-dimensional transient electromagnetic field generator is established by A Z in this paper [15,16]:…”

Section: Parameters and Modelmentioning

confidence: 99%

See 1 more Smart Citation

Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings

Wei

et al. 2019

IET Power Electronics

Self Cite

The primary problem brought by high speed is high-frequency loss. The loop current (LC) of inter-turn short-circuit fault causes serious distortion of the magnetic field in high speed permanent magnet generator (HSPMG), whose effects on the loss cannot be ignored. In order to reveal the influence mechanism of ITSC fault on the loss, the two-dimensional finite element model of the 117 kW, 60,000 rpm HSPMG is established. By comparing calculation results and test data, the accuracy of the model is verified. The distribution of the eddy current density is studied, and the fundamental reason for the sharp increase of eddy-current loss after fault is found. The core losses at different positions were obtained by segmenting stator core, and the variation mechanisms of core losses at different positions are revealed. The change of heat source distribution of stator core after fault is determined. The variation of winding copper loss after fault is analysed, and the influence degree of the LC on the fault phase and healthy phase copper loss is determined. In addition, because the temperature field is directly related to the loss, the research also laid a foundation for the next analysis of the temperature field.

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Influence of rectifier characteristic harmonics on loss and temperature field of high‐speed permanent magnet generator

Int Trans Electr Energ Syst

Wei

et al. 2020