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| Design of Multi-Physical Field Coupling Model of Magnetic Latching Relay and Analysis of Influencing Factors of Contact Bounce |
| Bao Guanghai1,2, Wang Jinpeng1, Wang Yilong1 |
1. College of Electrical Engineering and Automation Fuzhou University Fuzhou 350108 China;
2. Fujian Key Laboratory of New Energy Generation and Power Conversion Fuzhou 350108 China |
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Abstract Contact wear and contact adhesion caused by contact bounce have an important impact on the electrical life of relay. Considering the complex contact bounce of the magnetic latching relay under the interaction of elastic deformation of the reed and contact collision, the processing method defining the model as rigid body cannot restore the actual motion state of the flexible reed. The collision of the rigid body leads to the deformation of the spring of the flexible body, which affects the action time and bounce of the relay. The accurate simulation of the movement state of the reed is an important prerequisite to ensure that the simulation results of dynamic characteristics have reliable reference value.
In order to improve the accuracy and reliability of dynamic characteristics simulation, a rigid flexible coupling dynamic model is established to simulate the movement state of the relay. The traditional rigid flexible coupling method of model is to obtain the modal neutral file required for the establishment of flexible body with the aid of finite element software, and realize the coupling of rigid flexible model by importing the modal neutral file into the rigid body model of multi-body dynamics software. In addition to material properties, the deformation of flexible bodies is also affected by the mode order and the key points derived from the modal neutral file. Based on the motion equation, material constitutive equation and boundary conditions, the mathematical model of the motion field of the relay is established. Considering the impact of collision deformation of components on relay operation process, symmetrical penalty function method, hourglass coefficient and damping coefficient are used to deal with collision, contact and deformation of components. With the dynamics software Ansys LS-DYNA, the rigid flexible coupling model of relay electromagnetic system, contact system and transmission mechanism is established. Use APDL to build mechanical dynamics model. The electromagnetic model of relay is established based on Maxwell equations, the three-dimensional finite element model of electromagnetic system components is established by using the electromagnetic software Ansys Maxwell, and the external circuit of relay excitation coil is established by using the simulation software Ansys Simplorer. The electromagnetic system component model and the external circuit of the coil are coupled to form the relay electromagnetic model. Compared with the traditional circuit editor coupling mode, Ansys Simplorer has a stronger control function and a Simulink communication interface to receive the motion data of the relay. Simulink is used to control the start stop and data processing of the electromagnetic model. There is no ready-made data interaction channel between the electromagnetic model and the dynamic model. The Matlab program is used to control the data exchange of different physical field models, so as to realize the coupling calculation and data interaction of multiple physical fields of the two models in the same time domain.
The simulation results of the relay coil current curve, the reed shape variable of the dynamic model and the contact movement track are basically consistent with the measured results; Both the simulation and actual measurement of contact bounce show the phenomenon of bounce pull in bounce stable pull in, which verifies the accuracy of the multi physical field coupling model. On the basis of simulation, the influence of static spring elastic modulus, core coil voltage and normally closed static spring preload on contact bounce is investigated.
The 3D transient multi physical field coupling simulation can truly restore the working state of the relay product, simulate the dynamic characteristics of the relay and the contact movement. The larger elastic modulus and the larger pre pressure of the normally closed static spring can optimize the structural design of the relay and inhibit the contact bounce.
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Received: 17 August 2021
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2023, Vol. 38 
