Design And Control Strategy Of EMA Servo Drive System

As an alternative to hydraulic actuators,electromechanical actuator(EMA),that is characterized by compact structure,low pollution,easy maintenance and high efficiency,is often used in aerospace ships and other fields.In this paper,the large load electromechanical drive with strict space size requirements is taken as the object.Then researches around structural parameter design,strength check of key components,electrical circuit design,program development and testing,and motor control strategy improvement are conducted.In terms of structure,strength verification is performed through theoretical calculations and finite element analysis.The overall assembly and interface refinement are completed with Creo 3D modeling,and complete 2D drawings.Then complete the assembly of the prototype.In electrical design and software development,the motor servo control hardware is select and design.Then in order to optimize system’s heat dissipation and anti-electromagnetic signal interference performance,the internal components of the electronic control box are rationally laid out.Later according to the voltage frequency of the power supply and the working process of the electromechanical system,the electrical control circuit is designed and installed.Finally,according to the operation instructions of the system,the control program is written and the operation detection under the no-load state is performed.In the aspect of motor control strategy,researches are conducted on vector control and direct torque control.Vector control aims to achieve weak magnetic expansion,and direct torque control aims to eliminate the effect of stator resistance errors.For vector control,the simulation model,that involves the algorithms of maximum torque current ratio,lead angle weak magnetic expansion and SVPWM,is built to verify the effectiveness of the weak magnetic expansion.For direct torque control,the structural difference between current feedback and flux feedback is developed and simulation models of them are built respectively,while sliding mode observation is introduced in the process of flux feedback.The developed prototype can accurately control position through no-load and load test.At the same time,the respective effectiveness of above control strategies are verified by simulation.The research work in this paper has certain reference value for the application data collection of electromechanical actuator and the development of control servos.