Electromechanical Coupling Analysis Of PMSM And Precision Transmission System

Micro-special motors have been widely applied in various fields of national economy along with the rapid development of micro-electronics, computer and control technology; at the same time, the transmission accuracy of precision driving system has been improving constantly due to the appearance of various new design methods and processing technology, and it is still a key link in complex electromechanical system. As can be seen that micro-special motors and precision driving system have improved greatly under separate circumstance, so the research of coupling relationship between micro-special motors and precision driving system has important practical significance. The following works have been done:1. When the coupling models of complex electromechanical system were discussed, the fundamental way of electromechanical coupling can be summarized as following: First was to build the coupling model on the basis of extracting the coupling factors, then to decouple and resolve. Second was to discuss the basic ways of building the coupling model, including the fundamental element equation and loop equation of electromechanical system. And at last, two ways of resolving the coupling models were analyzed: transfer function and state space method.2. This paper mainly analyzed the electromechanical coupling factors between micro-special motors(e.g.PMSM) and precision driving system(e.g.precusion reducer) in terms of electromechanical coupling. Firstly, the establishing process of the experimental table on electromechanical coupling was demonstrated according to the modern electromechanical design method, which mainly including the determination of sampling frequency, the choice of displacement sensors, the characteristics analysis and choice of PMSM and precision reducer, the hardware structure of data acquisition system, the processing method of data, the program development for the experimental table.3. The simplified models and their transfer function were achieved according to the previous modeling and solving methods of the electromechanical system. Then the mathematical model of PMSM in three-phase coordinate was derived according to the lagrange-maxwell equation.4. Decouple the equation of PMSM through coordinate conversion according to the models built previously. Then the control block was acquired on the basis of the decoupled models.The PMSM and transmission system were simulated in Matlab/Simulink according to their models mentioned above, and certain conclusions were achieved.