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| Finite Element Calculation of Radial Electromagnetic Force Wave in Squirrel-Cage Asynchronous Motors |
| Wang Xun1, 2, Qiu Arui2 |
| 1.Beijing Mechanical Equipment Institute Beijing 100854 China 2.State Key Laboratory of Security Control and Simulation of Power Systems and Large Scale Generation Equipments Tsinghua University Beijing 100084 China |
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Abstract In this paper, the field-circuit coupled time-stepping finite element model of squirrel-cage asynchronous motor is presented and the validity is verified by means of the comparison between the stator phase current harmonics of the simulating wave and those of the experiment wave. Air gap flux density is calculated by means of this model and radial electromagnetic force is calculated using the classical Maxwell stress tensor method. Air gap flux density and radial electromagnetic force vary in both space domain and time domain and two dimensional Fourier analysis are carried out to calculate harmonics of those. The influence of the tooth and slot and the slip on flux density and radial electromagnetic force are discussed. The relationship of flux density waves and radial electromagnetic force waves are analyzed. Radial electromagnetic force waves and the testing electromagnetic noise spectra are analyzed and compared and the results verify the effectiveness of the calculation of radial electromagnetic force waves. Radial electromagnetic force and its harmonics calculated by the method can be used to electromagnetic noise analysis in the design stage.
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Received: 22 June 2010
Published: 20 March 2014
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2012, Vol. 27 
