【作者】 贾磊；

【导师】 朱熀秋；

【作者基本信息】 江苏大学 ， 电机与电器， 2009， 硕士

【摘要】 无刷直流电机是一种性能优越,应用前景广阔的电机,它结合了直流电机和交流电机的特点,既具备交流电机的结构简单、运行可靠、维护方便等一系列优点,又具备直流电机的运行效率高、调速性能好等诸多特点。无轴承无刷直流电机除了具有无刷直流电机的优点之外,还具有磁轴承的优点,在生物医药工程、半导体制造业、食品加工、飞轮储能、机器人、航空航天等特殊电气传动领域具有潜在广泛的应用前景,因此,对无轴承无刷直流电机的研究引起了广泛的关注。本文重点开展了无轴承无刷直流电机的基础理论和实验研究,建立了无轴承无刷直流电机的数学模型,研究了基于转子磁场定向的无轴承无刷直流电机控制系统,对无轴承无刷直流电机的无速度传感器技术进行了研究,设计了数字控制系统,具体内容如下:首先,介绍了无轴承无刷直流电机径向悬浮力的产生原理,推导了径向悬浮力和电机旋转部分的数学模型,设计了无轴承无刷直流电机的转子磁场定向磁场定向控制系统,利用Matlab/Simulink工具箱对控制系统进行了仿真,仿真试验表明控制系统不仅可以实现转子稳定悬浮,而且实现了径向悬浮力和旋转力矩之间的解耦控制,电机具有良好的动、静态性能。其次,提出了一种基于扩展卡尔曼滤波器(EKF)的无轴承无刷直流电机转子转速估算方法,并推导了转速估算公式,构成了无速度传感器无轴承无刷直流电机转子磁场定向控制系统。利用Matlab/Simulink建立了仿真模型,并进行了仿真,通过仿真验证了该控制系统具有较好的性能。最后,基于对转子磁场定向控制策略的分析,应用TMS320F2812 DSP构建了数字控制系统的硬件,开发了数字控制系统的软件,给出了各个功能模块的流程图。并对数字控制系统进行调试和优化,给出了相关实验结果,并进行了分析,通过实验来验证控制系统和控制方法的正确性。更多还原

【Abstract】 A brushless DC motor is a new type of motor that gets much popularity in the past few years. It combines the characteristics of AC motor and DC motor.Therefore,it has excellent timing capability,high efficiency,simple configuration,reliable operation,and can be controlled and maintained easily.The bearingless brushless DC motor(BLDCM) is an innovational type of motor,which has all excellence of magnetic hearings.As it is widely used in field of biologic engineering,aeronautics and astronautics,high technology energy resources,semiconductor manufacturing industries,food processing industries,medicine and sanitation industries,the research on BLDCM has received a lot of attention.The dissertation focuses on the fundamental theory and experiments of BLDCM including mathematic models,flux oriented controller,speed sensorless technology and the digital control system design.The detail contents are as follows:Firstly,the principle of radial suspension force is expounded.The mathematic models of radial suspension forces and rotation part of the BLDCM are deduced.In order to realize the decoupling control of torque and radial suspension forces for BLDCM,control system based on rotor flux oriented control is designed.The control system is simulated with Matlab/Simulink toolbox.The simulation results have shown that rotor can suspend steadily,torque and radial suspension subsystems can be controlled independently,the control method is valid and the whole control system has fine static and dynamic performance.Secondly,according to an Extended Kahnan Filter(EKF),a method for estimating the speed of sensorless bearingless brushless DC motor drives is proposed.The mathematic models of EKF are deduced,and the speed sensorless flux oriented control system of BLDCM is constructed. Using Matlab/Simulink toolbox,the simulation model is established.It can be seen that the control system has good performance by simulation.Finally,based on the principle of rotor flux oriented control,the digital control system is designed using TMS320F2812A of TI Corporation,and the flowcharts of each functional block are presented.Based on the prototype of BLDCM,the digital control system is debugged and optimized.The experimental rig of digital control system is set up and is used to validate control strategy.更多还原