Research On Linear Motor Actuator And It’s Dynamic Performance

With the rapid development of China’s economy,the machinery manufacturing industry has put forward more demanding requirements for advancing processing efficiency such as improving loading efficiency,reducing test costs,and improving test levels.In this paper,a linear motor is used as the drive source of the actuator,and measures to solve the proposition that the output force of the linear motor actuator is large are proposed.The linear motor is a transmission device that can directly convert electrical energy into linear motion mechanical energy without using any intermediate transmission mechanism.The energy conversion efficiency is extremely high.However,the output value of the linear motor is relatively small,which limits its application.This article is mainly aimed at the problem of small output force of linear motors and taking advantage of its high-frequency motion.Two permanent-magnet synchronous linear motors that move synchronously are mainly used as the drive source of the linear motor actuator.Applied to the 10 KN dynamic and static universal testing machine,the principle of resonance is used to improve the small load of linear motor output,and the advantages of its own high-frequency output are used to achieve efficient loading of large loads.First,the working principle of the actuator is explained,the working principle and application method of the power source permanent magnet synchronous linear motor are analyzed,and the construction of the linear motor actuator based on the synchronous use of two permanent magnet synchronous linear motors as the driving source is completed.Introduced the guide system of the actuator and the design of the heat dissipation cover,especially the self-locking device of the actuator,so that the actuator can be applied in different test equipment.Next,the actuator was applied to a 10 KN dynamic and static universal testing machine to make a prototype.Explain the performance,function,application principle and mechanical component composition of the testing machine,and use simulation analysis software to perform static analysis on the weak link parts,calculate the stress and deformation,etc.,and analyze whether each part reaches its mechanical properties.Requirements,and added a prestressed loading module.Thirdly,the in-depth analysis of the resonance motion of the linear motor actuator is established,the dynamic model of the actuator is established,and the system is analyzed by modal simulation to determine the theoretical value of the natural frequency of the loading system,which is required for the loading system at resonance The natural frequency of vibration gives a theoretical basis,and also provides a basis for realizing the function of the shaking table.At the same time,it is applied to increase the output force value of the testing machine,expand the load test range,and the test verifies the feasibility and correctness of the use of the resonance principle in the system,and obtains the magnification of the output load of the linear motor.Then,the three-closed-loop control theory is introduced.The current loop,speed loop and position loop of the driver are analyzed,the transfer functions of each control loop are obtained,the values of PID parameters are calculated,and each loop function is analyzed and calculated using simulation software.The corresponding response curve also corrects unreasonable parameters,laying a theoretical foundation for the experiment.Finally,static and dynamic control experiments were performed on the permanent magnet synchronous linear motor drive system through the driver software WorkBench and DynaTest fatigue control system,respectively,and the corresponding vibration curves were obtained.Relevant data was collected and analyzed.In particular,the resonance test was performed.The electromagnetic resonance fatigue tester is feasible for large loads and high frequency loading.