分段供电交流直线电机三相互感不对称分析及抑制

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Abstract This paper presents a research on air-gap magnetic field distribution and mutual inductance asymmetry phenomenon of the sectionally powered AC linear motor. With consideration of the harmonic magnetic field, the paper deduces the analytical expressions of the distribution of the air-gap magnetic field and the self- and mutual- inductance of the motor. Additionally, the paper verifies the correctness of the analytical expressions with help of the finite element simulation. The analysis shows that, the existence of the unexcited primary induces an additional off-set pulsating component in the air-gap flux density of the motor with common winding type, which results in the mutual inductance asymmetry, and the degree of the asymmetry lies of the length of the unpowered primary and that of the powered section. As to the motor with new winding type, the mutual inductance asymmetry results from the asymmetry of the arrangement of the winding, and the degree of the asymmetry only lies on the poles of the powered section, has nothing to do with the unpowered section. And compared with the motor with common winding type, the motor with the new winding type could apparently reduce the degree of the mutual inductance asymmetry.

Key words： Linear motor air-gap magnetic field distribution mutual inductance asymmetry

Received: 29 October 2013 Published: 23 March 2015

PACS:

TM315

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	Mu Shujun
	Chai Jianyun
	Sun Xudong
	Wang Shanming

Cite this article:

Mu Shujun,Chai Jianyun,Sun Xudong等. Analysis and Restrain of Mutual Inductance Asymmetry in the Sectionally Powered AC Linear Motor[J]. Transactions of China Electrotechnical Society, 2015, 30(1): 81-88.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I1/81

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