Affiliations: [a] The Key Laboratory of Low-Voltage Apparatus
Intellectual Technology of Zhejiang, Wenzhou University, Wenzhou, Zhejiang,
China | [b] Institute of Intelligent Manufacturing and Control,
Wuhan University of Technology, Wuhan, Hubei, China
Correspondence:
[*]
Corresponding author: Guichu Wu, The Key Laboratory of
Low-Voltage Apparatus Intellectual Technology of Zhejiang, Wenzhou University,
Wenzhou 325027, Zhejiang, China. E-mail: wgc@wzu.edu.cn
Abstract: A new approach considering the nonlinearity of the electric core is
proposed to analyze the magnetic field and magnetic force of 3D electromagnetic
contactors. The nonlinear constitutive law is established by measuring the B-H
curve of the core experimentally. Finite element method is used to model the
electromagnetic responses of the system, in which the 3D Ampère's
circuital law is implemented in PDE weak form. In order to analyze the
nonlinear responses of the magnetic field and magnetic force, the measured
constitutive law is incorporated with the weak form equation by numerical
interpolation. Both the static and transient responses of the electromagnetic
system are studied by solving the coupled weak form equations step by step.
Experimental results show that the proposed model has good predictions of the
magnetic force. The saturation due to the nonlinearity of the B-H curve can be
described as well. This modeling framework offers an advantage to solve the
nonlinear responses of 3D electromagnetic systems without theoretical modeling
the complex constitutive law of the electric core.
Keywords: Electromagnetic contactor, nonlinear constitutive law, magnetic force, energy consumption
