【作者】 范冬；

【导师】 邓智泉；

【作者基本信息】 南京航空航天大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 开关磁阻电机结构简单、运行效率高、容错能力强,具有良好的高温和高速适应性,有着极其广泛的应用前景。将无轴承技术应用于开关磁阻电机中可充分发挥其高速适应性,且利用对转子的径向控制改善了因不对称磁拉力引起的振动和噪声等问题。本文系统研究了无轴承开关磁阻电机系统的基本工作原理和控制策略。首先对空载控制策略特性进行了分析;在负载情况下,针对其径向悬浮力与电磁转矩的特点,引入了基于平均转矩-径向悬浮力的负载控制策略,并详细推导、分析了该负载控制策略下的数学模型。对无轴承开关磁阻电机本体进行了电磁设计,分析了电磁参数设计原则,给出了电机设计流程,并对转子进行了结构优化。利用有限元软件,建立了电机有限元模型,对径向悬浮力、转矩、电感及磁链特性进行了分析,仿真结构与理论计算值和样机实测值进行了比较,验证了样机的电感特性。对无轴承开关磁阻电机的控制系统进行了分析,包括功率电路、数字控制硬件电路、数字控制系统软件。参与制作、调试了基于三相不对称半桥和三相四桥臂的主绕组和悬浮绕组功率电路拓扑结构,分析、调试了基于TMS320F2812的DSP和MAXⅡEPM1270的CPLD数字控制系统。根据上述系统设计,通过对无轴承开关磁阻电机实验平台的综合调试,实现了不同转速条件下的基于固定开关角的空载控制策略和平均转矩-径向悬浮力的改变超前角的负载控制策略的动态稳定悬浮性能实验。更多还原

【Abstract】 A switched reluctance motor has simple structure, high efficiency and satisfactory robustness. It is very suitable for running at high speeds, with high temperatures and in bad environments. Moreover, the switched reluctance motor has a good feature as bearingless motors, in practice, switched reluctance motors are well known for vibration and noise caused by the fairly high radial force, the bearingless technology is quite possible to take advantage of the inherent high radial force for rotor shaft magnetic suspension.In this paper, it is devoted to study on Bearingless Switched Reluctance Motor (BSRM) system. It mainly discusses the operation principles and control schemes of BSRM system. The control characteristics of the BSRM under no load condition are analyzed. In view of the characteristics of radial force and electrical-torque for BSRM with load, the control strategy based on the relationship between average torque and radial force and the mathematical model for this control strategy are discussed in details.This paper gives the electromagnetic design of a bearingless switched reluctance motor, including principles of parameters design and motor designing flow. After the optimization of motor structure, radial force, electrical-magnetic torque, inductance and flux of a BSRM working in a cycle are analyzed employing the Finite Element Method (FEM) by using Ansys software. BSRM`s electrical-magnetic designs are verified by the results of simulation, theoretical calculation and measuring experiments on the designed prototype.According to the control characteristics of the BSRM, its controlling system is designed and analyzed, including power converters, digital controller hardware circuit, digital controller software programs. Power converter circuits of main winding and radial force winding based on the H-bridge asymmetric type converter & the four bridges converter are analyzed, debugged. The digital controller based on digital signal process (DSP) and complex programmable logic devices (CPLD) are analyzed.In terms of the whole platform of the proposed system, the experimental platform is tested with control strategy of fixed-turn-on angle and changing-advanced angle, the good suspension performance results validate the reliability of the proposed system.更多还原