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1

Magnet loss analysis for a high-speed PM machine with segmented PM and modified tooth-tips shape

Mlot A., Łukaniszyn M., Korkosz M.

Archives of Electrical Engineering

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2016

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Vol. 65, nr 4

671--683

EN

This paper presents the loss-oriented performance analysis of a radial highspeed permanent magnet (PM) machine with concentrated windings for automotive application. The PM synchronous machine was designed for an operating frequency up to 800 Hz. The main aim of this paper is to analyse the selected methods for magnet eddycurrent loss reduction. The first approach to rotor modification regards magnet segmentation in circumferential and axial directions. The second approach is based on changes in tooth-tips shape of the stator. The best variants of tooth-tip shapes are determined for further investigation, and adopted with a rotor having magnet segmentation. It is found that the machine with a segmented magnet leads to magnet loss reduction by 81%. Further loss reduction by 45% can be realized with the proposed tooth-tip shape. Additionally, owing to the stator and rotor modifications, the main machine parameters are investigated, such as back-EMF, electromagnetic torque, torque ripple and cogging torque. The 2-D and 3-D finite element analysis (FEA) is used for electromagnetic analysis. An experimental approach based on a partially wound stator is employed to verify the 3-D FEA.

2

Analysis of end-winding proximity losses in a high-speed PM machine

Mlot A., Lukaniszyn M., Korkosz M.

Archives of Electrical Engineering

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2016

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Vol. 65, nr 2

249--261

EN

This paper presents a finite element investigation into the proximity losses in a high-speed permanent magnet (PM) machine for traction applications. A three-dimensional (3D) finite element analysis (FEA) is employed to evaluate and identify the endwinding contribution into the overall winding power loss generated. The study is focused on the end-winding effects that have not been widely reported in the literature. The calculated results confirm that the end-winding copper loss can significantly affect the eddycurrent loss within copper and it should be taken into account to provide reasonable prediction of total losses. Several structures of the end-winding are analyzed and compared in respect to the loss and AC resistance. The results clearly demonstrate that the size of the end-winding has a significant impact on the power loss. The calculated results are validated experimentally on the high-speed permanent magnet synchronous machine (PMSM) prototype for selected various winding arrangements.

3

A single-phase slotless axial-flux low-power generator with ferrite magnets

Mlot A., Korkosz M., Łukaniszyn M.

Czasopismo Techniczne. Elektrotechnika

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2015

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Y. 112, iss. 1-E

129--138

EN

The design and development of an axial-flux ferrite magnet slotless generator for use in a small-scale wind turbine is described. The 4/4-pole single-phase machine is designed for simplicity and ease of manufacture and it consists of one slotless stator disc. The generator produces approx. 12 W at 1000 rpm with electrical efficiency of up to 46%. Because the efficiency of the machine is important, the power curve characteristics and voltage produced by the generator are investigated. The presented generator should generate sufficient output DC voltage to charge 4 to 5 batteries of 12 volt each. Finally, the finite element (FE) results are compared with measurements on a prototype. The calculated values coincide to a strong degree with the experimental results.

PL

Przedmiotem badań w niniejszym artykule jest prototyp generatora tarczowego, przewidzianego do zastosowania w małej elektrowni wiatrowej. Przedstawiono pomiary i obliczenia numeryczne ważniejszych parametrów funkcjonalnych, takich jak: sprawność, moc wyjściowa i moment elektromagnetyczny generatora tarczowego z magnesami ferrytowymi o strumieniu osiowym. Zbudowany prototyp generatorów o 4 biegunach stojana i wirnika posiada jednofazowe uzwojenie bezżłobkowe. W badanym generatorze zastosowano magnesy ferrytowe o przekroju prostokątnym oraz cewki owalne. Zasadniczym parametrem generatora jest napięcie rotacji, które powinno być wystarczająco wysokie do naładowania określonej liczby akumulatorów. W zamieszczonych poniżej rozważniach pominięto wpływ napięcia i rezystancji wewnętrznej baterii na parametry generatora. Analiza ta będzie kontynuowana w przyszłych badaniach. Do obliczeń pola magnetycznego zastosowano metodę trójwymiarową (3-D) opartą na metodzie elementów skończonych (MES).