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Energies 2018, 11(5), 1288; https://doi.org/10.3390/en11051288

Field Weakening Characteristics Computed with FEM-Coupled Algorithms for Brushless AC Motors

Faculty of Engineering, Mondragon Unibertsitatea, 20500 Arrasate, Mondragon, Spain
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Received: 19 April 2018 / Revised: 9 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

Finite Element Method (FEM) analysis tools are the most adopted in the design of brushless alternating current motors due to the advantage of considering multi-physics effects with dependencies of variables such as cross-coupling, saturation and others that are not possible to be modeled analytically with high precision. During the design process designers compute operation points such as maximum torque per ampere or flux weakening characteristics that cannot be targeted directly on the FEM tool. Therefore, designers make a sweep of simulations and post-processed the data in order to obtain the results, this is repetitive particularly in the conceptual phase of the design where features of the motor are still not defined. This paper presents nine algorithms as an alternative to compute with iterative methods operation points that cannot be targeted directly on a FEM tool. The algorithms must be coupled to the FEM tool and can compute complex points such as the characteristic current and modes of operations limits within acceptable range of error and times of execution for practical purposes. Validation of the algorithms using Jython is presented with results for the three types of brushless motors (non-salient, interior permanent magnet and reluctance motor). View Full-Text
Keywords: brushless motor; field-weakening; permanent magnet; electric drive; finite element method; algorithm brushless motor; field-weakening; permanent magnet; electric drive; finite element method; algorithm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Rivera, C.A.; Poza, J.; Ugalde, G.; Almandoz, G. Field Weakening Characteristics Computed with FEM-Coupled Algorithms for Brushless AC Motors. Energies 2018, 11, 1288.

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