【作者】 王清；

【导师】 崔淑梅；

【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2023， 硕士

【摘要】 电励磁电机因不使用稀土材料、成本低、调速范围宽,在电动汽车等领域得到了越来越多的重视。传统电励磁电机因为使用电刷和滑环,电机系统的寿命和可靠性受到影响,因此,研究无刷励磁的电励磁同步电机已经成为近年来的研究热点。谐振耦合式无线电能传输系统因其具有高功率密度的优点,是无线供电领域的新技术。本课题将谐振耦合式无线电能传输方式,应用到电励磁同步电机系统中来;提出了一种新型的无刷励磁电励磁电机系统:谐振耦合式无线励磁同步电机系统。本文主要对电机系统的控制方法进行研究,包括实现无刷化的双频电流调制方法、电励磁电机高效控制技术、电机系统协同运行闭环控制策略等。本文首先介绍了谐振耦合式无线励磁同步电机系统的构成以及工作原理。电机系统复用一套逆变源输出低频高频两种频率的电流,同时复用电机定子绕组作为无线励磁系统的发射绕组。低频电流控制电机工作,高频电流控制无线电能传输。文中提出了逆变器产生两种频率电流的调制方案,结合理论分析和仿真分析,对励磁电流的控制与调节过程进行了分析,实现了励磁电流的稳定控制。之后研究了电励磁电机的多种不同控制方法,分析了不同控制方法之间的过渡问题。提出了理论上最优的电励磁电机控制方案;通过解析计算分析了该控制方案下电励磁电机稳态运行过程,对电机控制方案进行了理论验证。在电机运行过程中,为了实现无刷励磁,定子绕组中通入了高频电流。文中分析了高频电流对电机运行存在的影响,包括电机的输出转矩脉动以及额外增加的损耗。同时,因为电励磁电机励磁电流变化范围较大,电机电感参数变化范围也较大,所以本文分析了电励磁电机的电感参数变化趋势以及对控制方法带来的影响,提出了解决参数变化问题的控制方法。最后,提出了电励磁电机系统的闭环控制策略。闭环控制方案使用转速-电流双闭环控制系统,引入了电压负反馈作为对弱磁控制的判断。通过仿真分析,证明了控制策略的可行性;之后通过编写控制程序,搭建实验平台,实验验证了电励磁电机系统的闭环控制策略。更多还原

【Abstract】 EESM have received increasing attention in fields such as EV due to their non use of rare earth materials,low cost,and wide speed range.Due to the use of brushes and slip rings in traditional EESM,the lifespan and reliability of the motor system are affected.Therefore,the study of brushless EESM has become a research hotspot in recent years.The resonant coupled radio energy transmission system is a new technology in the field of wireless power supply due to its advantages of high power density.This project applies the resonant coupling radio energy transmission method to the EESM system,achieving brushless excitation of the excitation system of the EESM;A new type of brushless EESM system,resonant coupled wireless excitation synchronous motor system,has been proposed.This article mainly studies the control methods of motor systems,including the implementation of brushless current modulation resonant coupling control method,efficient control technology for EESM,and closed-loop control strategy for collaborative operation of motor systems.The resonant coupled wireless excitation synchronous motor system utilizes wireless transmission of excitation current and multiplexes a set of inverter power supply with the motor control system.The inverter modulates and outputs currents of both low-frequency and high-frequency.The low-frequency current power supply machine controls the operation,while the high-frequency current is used for radio energy transmission of excitation current.The system reuses the stator winding of the motor as the transmitting winding of the wireless excitation system.The transmitting winding forms an excitation power supply magnetic field through three-phase high-frequency current,and the receiving winding on the rotor side resonates with the high-frequency magnetic field to receive excitation energy and generate induced electromotive force.After rectification,the excitation winding is supplied with power,thus achieving the function of brushless excitation.This article first studies the modulation schemes for the inverter to generate two types of frequency currents,and combines theoretical analysis and simulation analysis to verify the control and regulation process of excitation current.In order to establish a control model for an electrically excited motor,this paper analyzes different control methods for the motor and proposes the theoretically optimal control scheme for the motor;Afterwards,the steady-state operation process of the electric excitation motor was simulated and analyzed,and the motor control scheme was verified.During the operation of the motor,in order to achieve brushless excitation,high-frequency current was introduced into the stator winding.In order to analyze the impact of high-frequency current on the motor operation,the output torque ripple and additional losses of the motor were studied.At the same time,due to the large range of excitation current and inductance parameter changes in electric excitation motors,this article analyzes the trend of inductance parameter changes in electric excitation motors and the impact on control methods.Finally,a dynamic closed-loop control strategy for the entire electric excitation motor system was proposed.The feasibility of the control strategy has been proven through simulation analysis;Afterwards,by writing control programs and building an experimental platform,the closed-loop control strategy of the electric excitation motor system was experimentally verified.更多还原