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Authors: Shu, Liang | Wu, Guichu | Zhu, Xiangou | Chen, Dingfang | Zhao, Sheng

Article Type: Research Article

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. Show more

Keywords: Electromagnetic contactor, nonlinear constitutive law, magnetic force, energy consumption

DOI: 10.3233/JAE-131660

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 42, no. 2, pp. 237-248, 2013

Authors: Ye, Peng | Shu, Liang | Wu, Guichu | Zhou, Liang

Article Type: Research Article

Abstract: The closing process of intelligent AC contactor can be affected by selection phase angle and the dynamic control strategy. A control strategy is proposed to compensate the influence of closing process at different phase angles. The mathematical model of the closing process is established by analyzing the dynamic characteristics of the contactor. Simulation and experimental comparisons show that the proposed model can predict the dynamic response of the closing process effectively. The relationship between the closing phase angle and the end speed is analyzed by using the experimental measurements. The selection phase angle and dynamic control is implemented by combining …voltage zero crossing and PWM section control technology. The input voltage and the zero-crossing signal are taken as the control input while the PWM duty cycles and the strong excitation time are taken as the control output. The control strategy is implemented by using the lookup table. Experimental results show that by using the proposed strategy, the contactors can be closed with the same phase angle. Therefore the consistency of the dynamic closing process of the intelligent contactors can be guaranteed. Also, the movable armature end speed of the closing is reduced 31.5% and the closing time is decreased 15.6%. The mechanical life of the contactor has been increased about 4 times in the durability test. Show more

Keywords: PWM, selection phase angle control, intelligent contactor, voltage zero crossing

DOI: 10.3233/JAE-141741

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 1, pp. 1-10, 2014