【作者】 包晓明；

【导师】 刘国海；

【作者基本信息】 江苏大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 无刷直流电机利用电子换相代替机械换相,克服了传统直流电机由于电刷摩擦而产生的一系列问题,并且具有调速性能好、体积小、效率高等优点,因而广泛应用于国民经济生产的各个领域以及人们的日常生活中。在无刷直流电机的控制策略方面,基于智能控制思想的模糊控制最大特点是不依赖于被控对象模型,而是利用所制定的模糊控制规则进行推理以获得合适的控制量。但是模糊控制方法不含积分环节,稳态误差很难消除,所以本控制系统将传统PI控制与模糊控制相结合,以期获得良好的动、静态性能。文章在分析无刷直流电机数学模型的基础上,在Matlab环境下建立了控制系统的仿真模型,并对系统进行了仿真。仿真结果表明模糊PI控制系统响应速度快、超调小、稳态性能好,这是单纯的PI控制难以实现的。在仿真实验的基础上,设计了基于DSP(ADMC 401)的转速、电流双闭环的无刷直流电机控制系统。系统采用调节端电压的方法实现对电机转速的控制,其中电流采用传统PI调节,转速采用模糊PI控制。相对于参数固定的传统PI控制器,模糊PI控制器可以根据被控对象的当前状态在线调整控制器参数K_p、K_i,提高了系统的控制性能。在对硬件部分和软件部分进行调试后,对控制系统进行了实验,通过实验波形,进一步验证了模糊PI控制相对于传统PI控制的优越性。本文最后对整个系统的设计进行了总结,并对无刷直流电机模糊PI控制技术存在的问题和后续的研究工作提出了自己的见解。更多还原

【Abstract】 The brushless DC motor (BLDCM) adopts electronic commutation instead of mechanical one, which overcomes a series of disadvantages of the traditional DC motor caused by the brush friction. Furthermore, with many advantages such as good speed regulating performance, small volume and high efficiency, it is widely applied to every field of national industry and people’s daily lives.In terms of control strategy of BLDCM, the most obvious characteristic of the fuzzy control which is based on intelligent control is that it doesn’t rely on the object model, but utilizes the rules set by fuzzy control to make reasoning in order to get proper control value. However, it is difficult to eliminate the steady-state error with fuzzy control, because it doesn’t contain integral units. Therefore, this control system combines the traditional PI control with fuzzy control, expecting to obtain better dynamic and static performance.Based on BLDCM’s mathematical model, the simulation model of control system is build, and simulated in Matlab Environment. The simulation results indicate that the Fuzzy-PI control system has fast dynamic response, smal overshoot and excellent reliability.Based on the simulation, the current and speed double closed loop control system of BLDCM based on ADMC401 is deigned. The speed regulation is realised by adjusting the terminal voltage of the motor. In this system current is regulated by PI controller and speed is regulated by Fuzzy-PI controller. Compared with classical PI controller of which the parameters are fixed, Fuzzy-PI controller can regulate the parameters on-line according to current status of object controlled, and the control performance could be enhanced.After the hardware and software of the system have been debugged, the experiment is carried out, and the advantage of Fuzzy-PI control over classical PI control is further verified by the experimental figure. The entire system is evaluated in the end, and opinions on the existing problems of BLDCM’s Fuzzy-Pi control technique and further studies are put forward.更多还原