Analysis of irreversible magnet demagnetization in line-start motors based on the finite-element method

Kang, Gyu-Hong; Hur, Jin; Nam, Hyuk; Hong, Jung-Pyo; Kim, Gyu-Tak

doi:10.1109/tmag.2003.810330

Cited by 113 publications

(11 citation statements)

References 4 publications

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“…Motors An important obstacle for ordinary PMSMs is that they need an inverter for starting, which is not economical for many single speed applications. The squirrel-cage equipped permanent magnet motor-the LS-PMSM-provides a high efficiency motor with high starting capability, but without the need of a drive system [3,27]. LS-PMSMs can now reach super premium efficiency levels [28].…”

Section: Line Start Permanent Magnet Synchronousmentioning

confidence: 99%

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Fault detection of broken rotor bar in LS-PMSM using random forests

et al. 2018

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Abstract-This paper proposes a new approach to diagnose broken rotor bar failure in a line start-permanent magnet synchronous motor (LS-PMSM) using random forests. The transient current signal during the motor startup was acquired from a healthy motor and a faulty motor with a broken rotor bar fault. We extracted 13 statistical time domain features from the startup transient current signal, and used these features to train and test a random forest to determine whether the motor was operating under normal or faulty conditions. For feature selection, we used the feature importances from the random forest to reduce the number of features to two features. The results showed that the random forest classifies the motor condition as healthy or faulty with an accuracy of 98.8% using all features and with an accuracy of 98.4% by using only the mean-index and impulsion features. The performance of the random forest was compared with a decision tree, Naïve Bayes classifier, logistic regression, linear ridge, and a support vector machine, with the random forest consistently having a higher accuracy than the other algorithms. The proposed approach can be used in industry for online monitoring and fault diagnostic of LS-PMSM motors and the results can be helpful for the establishment of preventive maintenance plans in factories.

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Section: Line Start Permanent Magnet Synchronousmentioning

confidence: 99%

“…Their work also uses analysis on the frequency domain using power spectral density (PSD) analysis. In [27], the irreversible demagnetization of an LS-PMSM is analyzed using transient analysis and the two-dimensional finite-element method. The analysis and results are based on a model, and not a physical LS-PMSM.…”

Section: Line Start Permanent Magnet Synchronousmentioning

confidence: 99%

Fault detection of broken rotor bar in LS-PMSM using random forests

et al. 2018

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“…There are many studies in the literature for improving the start performance of LS-PMSMs under different loads and line voltages, and for ensuring that the motor operates more efficiently after synchronization. It is observed that these studies have focused on improving the motor dynamic model, which expresses the operating characteristic of the motor better, as well as the determination and optimization of the design parameters with an impact on the synchronization performance of the motor [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Design of A Novel Line Start Synchronous Motor Rotor

2018

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Line start permanent magnet synchronous motors (LS-PMSM) are preferred more and more in industrial applications, because they can start on their own and because of their high efficiency. In this study, a new LS-PMSM rotor typology is suggested, which is modelled using surface mount permanent magnets, in which two different slot types have been used together. The rotor of an asynchronous motor on the industrial market in the IE2 efficiency segment has been remodeled in the study, resulting in an increase in motor efficiency from 85% to 91.8%. A finite elements software was used for determining motor design and performance, in addition to analytical methods.

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“…There have been serious efforts to reduce the amount of magnet material required in IPM machine designs, or to replace rare-earth PM materials with ferrite magnets while maintaining high performance characteristics [5][6][7]. Unfortunately, these approaches often lead to aggressive machine designs that operate near the limits of irreversible demagnetization [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of magnet properties on power density and flux-weakening performance of high-speed interior permanent magnet synchronous machines

McFarland

Jahns

El-Refaie

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper investigates the impact of varying magnet properties on the performance characteristics of interior permanent magnet (IPM) machines for traction applications with a special emphasis on the power density and flux-weakening performance. Several IPM machines utilizing four different grades of magnet materials are optimized to meet a set of traction machine specifications with a minimum total active mass. The designs are then compared based on total active mass, efficiency, flux weakening, high-speed operating characteristics, and a number of other metrics. Results show that magnets with a higher energy-product generally achieve higher torque density in the final machine. However, the relationship between torque density and magnet energy product is nonlinear and requires consideration of other factors including coercivity. These results lead to a better understanding of the engineering tradeoffs encountered by designers who are evaluating use of Dysprosium(Dy)-free Neodymium-Iron-Boron (NdFeB) or ferrite PM material as lower-cost alternatives to conventional rare-earth magnets.

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Analysis of irreversible magnet demagnetization in line-start motors based on the finite-element method

Cited by 113 publications

References 4 publications

Fault detection of broken rotor bar in LS-PMSM using random forests

Fault detection of broken rotor bar in LS-PMSM using random forests

Design of A Novel Line Start Synchronous Motor Rotor

Effect of magnet properties on power density and flux-weakening performance of high-speed interior permanent magnet synchronous machines

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