Research On Motor Drive And Drag Reduction Technology

With the development of social productivity and the continuous improvement of material civilization needs,electric motors have become one of the indispensable power sources of industrial society.With the integration of disciplines,the rise of Micro-Electro Mechanical Systems(MEMS)has shown great advantages in aerospace,military,medical,intelligent equipment,etc.,widely replacing traditional power components,and its miniaturization The advantages of integration,intelligence,and low power consumption are more in line with the development trend of modern technology.Micro motors are quite different from traditional motors in terms of mechanical structure,driving principles,driving methods,and affected parameters,and their research methods and basic theories need new support.Under the trend of miniaturization,rotor resistance has become an important factor limiting the improvement of the performance of micro motors,and traditional machining methods are difficult to solve this problem.The driving and drag reduction method of the motor is directly related to the performance of the motor.This paper is based on a liquid-floating rotor-type micro-motor.The research is carried out from two aspects of driving method and drag reduction method.In order to reduce power consumption and increase torque,a set of high-performance driving system is designed,and nano-materials are used at the same time.The preparation technology is to perform hydrophobic treatment on the rotor of the micro motor,and greatly reduce the rotation resistance under the condition of liquid floating,so as to achieve the purpose of reducing power consumption and increasing torque.By analyzing the structure and working principle of the liquid-floating rotor micromotor,a synchronous drive system is designed in this paper,which adopts double closed-loop control of drive voltage and back-EMF signal.In order to further improve the performance of the motor,this paper adopts a two-phase fixed overlap drive method to increase the electromagnetic torque of each beat.Due to the high integration of the liquid-floating rotor micromotor,the sensorless speed detection technology is adopted in this paper,and the speed and position of the motor rotor are estimated by sampling and algorithmic processing of the back-EMF signal.The effectiveness test of the system shows that the speed control accuracy error of the drive system is less than 1%,and the maximum speed can reach 20000 rpm under 5V working voltage,which provides a test platform for the research of drag reduction methods.Analyze the material properties of the liquid floating rotor,design the drag reduction scheme of the permanent magnet rotor under the liquid floating support structure,and prepare the super-hydrophobic surface by chemical etching.The drag reduction performance of rotors with different hydrophobic abilities in different suspensions was tested,and the drag reduction effect of the drag reduction method on the liquid floating rotor micromotor was analyzed.Experiments show that under the conditions of 5V working voltage and 10000 rpm speed,the motor rotor with super-hydrophobic structure reduces the overall power consumption of the device by9.8%;under the condition of constant voltage open-loop drive,the speed of the motor with super-hydrophobic structure increases 13.3%.