Research On High Power Density Drive System Of Flap-Slat EMA

With the rapid development of more/all-electric-aircraft and related technologies,promotion,application and depth research of high power density Electromechanical Actuator(EMA)has been greatly promoted in aeronautical actuation system.High frequent acceleration and deceleration,bidirectional load characteristics are the operating characteristics of Flap-Slat EMA drive System,so the issues of its design is the effective treatment of bidirectional energy flow and reliable heat conduction of power consumption.In order to to improve power density of system,reduce the volume and weight of the system,research on how to improve energy efficiency and accurate thermal design of Flap-Slat EMA drive System has been carried out in this paper.Firstly,the flow characteristics of energy and the generation mechanism of regenerative energy on Flap-Slat EMA drive system were explained when the wing panel worked.A dual-vector EMA drive system based on voltage vector full-controlled rectifier system and motor vector control system was put forward,and the design of the model analysis and control system were also carried out.Dual vector EMA drive system can realize the energy exchange between the three phase AC power grid and the actuating mechanism,and it can solve the problem of the effective treatment of regenerative energy and energy efficiency.Secondly,according to the demand and thermal design problems of high power EMA drive system,based on the analysis of the traditional thermal design problems,considering the effects of various factors on modeling and simulation of cooling system,the accurate calculation of average power losses and transient power losses of heat sources in the system were carried out,and an accurate RC network thermal circuit model and equivalent slice simulation model were established.In this paper,a co-simulation design scheme of hybrid simulation thermal model was proposed based on multi-factor coupling transient thermal circuit model and FloEFD-based equivalent slice thermal simulation model,and the relevant parameters of the heat sink in the cooling system are designed.Based on the theoretical analysis and modeling,the dual-vector EMA control system and multi-factor coupled thermal circuit model has been simulated and verified in the simulation software of MATLAB/Simulink.The equivalent sheet thermal model based on FVM method has also been simulated and verified in the thermal simulation software of FloEFD.The hybrid thermal model of co-simulation has been carried out for the thermal design and optimization of Flap-Slat EMA drive system.Finally,according to the former analysis,calculation and simulation results,a prototype controller of Flap-Slat EMA has been designed.Based on a Flap-Slat EMA drive system load test platform,the motor operating experiments and temperature experiments have been implemented.Through the analysis and comparison of experimental results between the new designed controller and original controller,the high power density of Flap-Slat EMA drive system has been evaluated and the effectiveness of the system design has also been verified.