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《Transactions of China Electrotechnical Society》 2015-09
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Harmonic Currents Determination and Their Impacts on Multiphase Fractional-slot Concentrated Winding Surface-mounted Permanent Magnet Machine

Kang Huilin;Zhou Libing;Wang Jin;Peng Xi;State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology;  
A five-phase 20-slot 22-pole fractional-slot concentrated winding multiphase surface-mounted permanent magnet machine is exemplified to study the influence of the injected harmonic currents. The optimal harmonic current component is analytically derived to achieve the maximum average torque while the effective values of the phase currents are kept unchanged. The analytical current is verified by finite element analysis. Further,comparisons of electromagnetic torque, magneto-motive force, air-gap flux density, eddy current loss, and radial force density between the machines with and without harmonic current injection are respectively carried out. The results show that new space harmonics including the ones with lower orders appear due to the injected harmonic current,which leads to the increases of the eddy current loss and the lowest order radial force. The results demonstrate the key points and guidance for the multiphase permanent magnet machine design.
【Fund】: 国家自然科学基金面上项目(51177056);国家自然科学基金青年科学基金(51307067)资助项目
【CateGory Index】: TM351
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