Multi-domain Modeling Of Permanent Magnet Synchronous Motor And Analysis Of Its Driving Characteristics

Permanent magnet synchronous motor has many advantages, such as simplestructure, high efficiency, good low-speed performance and so on. As a driving power, it iswidely used in aerospace, electric pumps, electric vehicles and other industrial products, thedrive characteristics of permanent magnet synchronous motor directly affect these products’performance. With the development of computer simulation technology, simulation hasbecome one of important means to analysis and design the permanent magnet synchronousmotor drive system, however, it is a complex system which is related to multiple disciplinessuch as mechanical, electrical, magnetic, control, thermal system, the performance ofdrive system is affected by many factors. Existing simulation platform is difficult to achievea unified multi-domain modeling and a comprehensive analysis of the complex system onthe same platform. In response to these problems, this paper based on the unifiedmulti-domain modeling and simulation technology, study multi-domain modeling andsimulation of permanent magnet synchronous motor drive system and the tuning method ofits control parameters, the main work is as follows.Analyzed the mathematical model of permanent magnet synchronous motor and theempirical calculation methods of its different types of loss, based on the above theory,thispaper studies the modular non-causal modeling approach of the permanent magnetsynchronous motor. Based on the unified modeling language Modelica,this paperestablished the multi-domain system model of the permanent magnet synchronous motorwith the principle of the strong reusability, readability and the non-causal expression. Themodel has the characteristics of parameterized and standardized,so its reusability is strong.It and can be directly applied to the composition of the complex multi-domain system, laidthe foundation for the multi-domain modeling of permanent magnet synchronous motordrive system.Studied the Multi-domain modeling methods for permanent magnet synchronousmotor drive system. First, analyzed the control methods of permanent magnet synchronousmotor drive system and determine the vector control as the control strategy. Then analyzedthe structure and working principle of permanent magnet synchronous motor drive systembased on vector control, and then researched the non-causal expression and reusable mechanism of component models in different areas. At last, based on the componentmechanism of Modelica language, this paper established the model of permanent magnetsynchronous motor drive system based on vector control by component connection，achieved the coupling of the system model in different areas on the same platform.Explored the tuning method of the control parameters of the permanent magnetsynchronous motor drive system. In engineering，tuning the control parameters ofpermanent magnet synchronous motor drive system is often difficult. To solve this problem,this paper propose a randomized trial of the Monte Carlo method to adjust the controlparameters of the control system, the method is simple, practical and effective,and canadjust several control parameters in parallel.At the end of the paper, demonstrated the engineering value of integrated simulationof permanent magnet synchronous motor drive system in various fields with the example ofa certain type of control moment gyroscopes. By the modeling method of multi-field unified,non-causal and object-oriented, based on Modelica language.this paper establishedmulti-field coupling model of the drive system, and did a comprehensive simulationanalysis of the characteristics of the drive system. By writing Python scripts, used themethod of Monte randomized trial to adjust the parameters of the control system. Thenanalyzed the variation law of the control parameters at different speeds, and improved PIcontroller based on this law.