Research On Optimization And Design Of Permanent Magnet Motor For Integrated Roller Screw Linear Actuator

Use of Electro-Mechanical Actuator has become the development trend of more electricity and all-electric aircraft.With the improvement of the size,accuracy and performance requirements of the Electro-Mechanical Actuator in the aerospace field,the problems of the ball screw linear actuators in the bearing capacity,stroke life,friction and efficiency are becoming increasingly obvious.In recent years,the roller screw linear actuator has solved the problems existing in the ball screw linear actuators and is widely used for its special structure and superior performance.Permanent magnet synchronous motor with its high efficiency,high power density and the characteristics of high torque density,has been widely used in aerospace field,as the roller screw linear actuators execution unit,the limited size has great restrictions on the performance of the electromagnetic performance of the motor,the stand or fall of permanent magnet synchronous motor design is crucial to the whole of the Electro-Mechanical Actuator.In this paper,a permanent magnet synchronous motor(PMSM)for integrated roller lead screw linear actuators is designed to give full play to the motor performance of the maximum limit within the limited size and realize the rapid response and smooth performance of the motor.The main research contents of this paper are as follows:This paper firstly analyzes the problems and key technologies of PMSM in aerospace field.and the structure and materials of each component are determined according to the given performance index.Analytical method is used to calculate the dimensions of the motor.The equivalent model of permanent magnet and external magnetic circuit are analyzed,and the relationship between the main permeability and flux leakage,flux leakage coefficient and no-load flux leakage coefficient is analyzed,Secondly,the motor simulation process is determined.The RMxprt module in ANSYS is used to preliminarily model the motor.the motor simulation process is determined,and the RMxprt module in ANSYS is used to preliminarily model the motor.In Maxwell 2D transient field,the motor is pre-processed to analyze the distribution of magnetic field lines,magnetic density distribution,opposite potential and harmonic content of the motor under no load,The performance of the motor under load was analyzed.In view of the particularity of the motor structure,the motor model was built in Solidworks and imported into Maxwell 3D to analyze the performance of the motor.Analytical method is used to analyze the size of the moment of inertia,The influence factors of torque ripple and phase inductance on motor response speed are analyzed.Parametric scanning method is used to optimize the gear torque and fast response performance of the motor.In addition,the motor is connected with the control part by co-simulation technology to carry out field-road coupling simulation to verify the overall performance of the motor.Finally,the static performance and dynamic performance of the prototype are tested.Static performance includes estimation of resistance,inductance and maximum speed,while dynamic test includes PMSM speed test,roller lead linear actuator step response test and servo response test.Static performance includes estimation of resistance,inductance and maximum speed,while dynamic test includes PMSM speed test,roller lead linear actuator step response test and servo response test.The experiment shows that the designed motor in this paper meets the requirements of rapid response and stability.