Comparative Analysis of the Steady-State Model Including Non-Linear Flux Linkage Surfaces and the Simplified Linearized Model when Applied to a Highly-Saturated Permanent Magnet Synchronous Machine—Evaluation Based on the Example of the BMW i3 Traction Motor

This paper presents a finite element method (FEM)-based model, which describes the magnetic circuit of the BMW i3 traction machine. The model has been reconstructed based on data available in the public domain. The reader is provided with numerical data regarding flux linkage surfaces in d- and q-ax...

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Bibliographic Details
Published in:Energies (Basel) 2021-05, Vol.14 (9), p.2343
Main Authors: Gierczynski, Michal, Grzesiak, Lech M.
Format: Article
Language:English
Subjects:
Automobile industry
Comparative analysis
Design
field-weakening
finite element method (FEM)
Geometry
Influence
Linearization
Magnetic circuits
Mathematical models
Nonlinearity
permanent magnet synchronous machine (PMSM)
Permanent magnets
Power
Powertrain
Preliminary designs
Public domain
Simulation
Software
Synchronous machines
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Summary:This paper presents a finite element method (FEM)-based model, which describes the magnetic circuit of the BMW i3 traction machine. The model has been reconstructed based on data available in the public domain. The reader is provided with numerical data regarding flux linkage surfaces in d- and q-axes, as well as with all the information needed to develop a space-vector model of the machine in steady-state, taking into consideration the non-linearity of the magnetic circuit. Hence, the data of a highly-saturated machine from a renowned product are provided, which can serve as a reference design for research. After that, torque curve and partial load operation points are calculated. Finally, the machine model is linearized and the calculations are repeated with the simplified linearized model. The results from both models are then compared with each other. This comparison is intended to assess the magnitude of the expected inaccuracies, when simplified analytical tools are applied to highly-saturated machines (which are the backbone of automotive electrical drivetrains). It is especially important with regard to preliminary design of electrical drivetrains, as at this stage detailed machine geometry and materials are not known.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14092343