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Title: Fast algorithm to obtain the torque characteristics with respect to load angle of synchronous machines using finite element method
Authors: Zhang, X
Ho, SL 
Fu, WN 
Keywords: Finite element method (FEM)
Nonlinear iteration error
Synchronous machine (SM)
Torque-load angle characteristic
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on magnetics, 2014, v. 50, no. 11, 6971437 How to cite?
Journal: IEEE transactions on magnetics 
Abstract: Synchronous machines (SMs) have wide applications in many areas including industrial, agricultural, and domestic. The torque-load angle relationship is an essential parameter governing the characteristics of SMs. Conventionally, for each load angle, a transient magnetic field model using the time-domain finite element method (FEM) needs to be solved, and hence it is very time-consuming to obtain the complete characteristics of SMs. In this paper, a fast variable phase method, which computes the transient process of the time-domain FEM once only and not repeatedly, is proposed to find the entire torque-load angle curve of SMs. By adjusting the time-step size and the nonlinear iteration error tolerances, the proposed method can significantly reduce the computing time when compared with those of conventional methods.
ISSN: 0018-9464
EISSN: 1941-0069
DOI: 10.1109/TMAG.2014.2321372
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