Study On Electromechanical Actuator With High Power Density

With the improvement of the dynamic response of the electromechanicalactuator system, the response speed of the servo motor is required graduallyimproved. When the system is in a rapid response, the motor need to output alarge power to provide the energy required of acceleration in a very short periodof time, at which the motor’s power rate is very large. In the regular design ofmotor, the maximum output performance of the motor is pursued, and short-timeoverload ability of motor has been quite large to satisfy the high requirements ofthe instantaneous overload output. However, in order to ensure reliable operationof the motor, the continuous effective value of the motor output should also beenough. So it is necessary to select and design motor through the analysis of thepower rate to effectively avoid the shortage of continuous output values.The mechanism of electromechanical actuator which is composed of ball screwtransmission is mainly studied. Based on the analysis of power change rate of themechanism, the design of the built-in motor which is directly connected with theball screw is discussed under the condition of the load side frequency responserequirements satisfied. The requirements of the load side frequency responseshould be satisfied in the case of the driving side and the load side inertiamatched.During the process of built-in motor design, using the existing models of ballscrew, the selection principle of the lead and the working speed is mainlydiscussed, and the limitations of the built-in volume, short-time work and oftenrunning overload conditions should be considered at the design of the motor.Specifically, the selection principle of the basic structure of the motor isdiscussed, and the AC servo motor optimization processes based on adjustmentof the permanent magnet shape are given.Finally, the simulation date and experiment data, which are got by the method of finite element simulation and the rational experiment, should becompared; then, the deviation between electromagnetic design performance andprototype performance is analyzed and the conclusion will be got.