Analysis of flux-weakening control and dynamic characteristic for making process of sensorless intelligent permanent magnet contactor

作者：Wang Xianbing^*; Lin Heyun; Fang Shuhua; Ren Qiwen; Jin Ping

来源：Proceedings of the CSEE, 2011, 31(18): 93-99.

• Dynamic characteristics
• Flux weakening control
• Intelligent closed-loop control
• Permanent magnet contactor
• Sensorless

A flux-weakening control strategy for permanent magnet (PM) contactors was proposed, which realized the intelligent closed-loop control during making process and made the dynamic attraction force match with the reaction force well. A sensorless detection of real-time displacement signal of the moving iron core was realized by combining magnetic circuit and electric circuit models. Dynamic mathematical model for making process under the flux-weakening control strategy was established by coupling the voltage equivalence equation and the mechanical motion equation, based on which the making dynamic process was simulated by using 4-order Runge-Kutta algorithm. The experimental results show that the coil positive and negative currents can be effectively controlled by adjusting and optimizing the forward and backward PWM duty cycles. As a result, the movement velocities of the movable contact and the moving iron core can be regulated and the first and the second contact bounces are reduced significantly. Simulated results coincide with experimental ones well. ? 2011 Chin. Soc. for Elec. Eng.

• 出版日期2011
• 单位东南大学