Servo Drive System Motor Control And The Electromechanical Coupling Analysis

Servo drive system is one of the key components of the CNC machine. The machining accuracy of CNC machine tool is largely determined by the servo drive system. With the development trend of CNC machine tools’ high speed and intelligent, the smoothness of servo drive system is put forward with higher requirement. Electromechanical coupling vibration problem has become the current urgent need to solve the problem. Therefore, to carry out the electromechanical coupling analysis of CNC machine tool servo drive system, clarify coupling vibration dynamic characteristics of servo system, to solve the coupled vibration is of important theoretical significance and engineering application value.This article mainly discuss research from the following several aspects:① With permanent magnet synchronous motor as the research target, analysis its structure and operation principle. Establish the static coordinate system of the stator reference frame and the rotation coordinate system of the rotor pole reference frame respectively. With different coordinate system as the platform, respectively, establish the permanent magnet synchronous motor voltage equations, flux linkage equations, electromagnetic torque equation and the equation of motion. Control strategy of permanent magnet synchronous motor is established under the mathematical foundation.② Different control strategies have great influence on the performance of the motor, the current main magnetic field of permanent magnet synchronous motor are vector control and direct torque control. This part introduces the principle of voltage space vector control on the basis of the establishment of permanent magnet synchronous motor and reducer subsystem model. Based on the magnetic field on the basis of vector control, the speed reducer is regarded as the load of the motor, the simulation model is set up in MATLAB/SIMULINK environment, and the simulation results show that this control strategy can be a very good implementation of the motor idling and load operation, and has a good dynamic and control performance.③ Servo drive system of the whole electromechanical coupling vibration analysis has been the research hotspot and difficulty, the mechanical and electrical system is equivalent to “One machine and one electricity” system to highlight the main factor analysis. Analyze the source of the four major influence factors: nonlinear friction nonlinearity, clearance, load disturbance and electrical parameters and the influence on the system output in detail. Under the environment of MATLAB/SIMULINK modeling and simulation, get the vibration of the system respectively under the analog input range. From the start to the running smoothly transition process, provides the simulation data reference and theoretical basis for the design of the machine tool servo system.④ Set up the experimental platform. Write the data acquisition program using Lab VIEW software. Acquire motor current changes under the condition of load disturbance with the open pressure principle. Collect the data by voltage transmitter to the PC via RS485 interface and display and analysis the data from collection window to provide experimental data for the above theoretical analysis. Ensure the correctness of the analysis combining theory experiment.