【作者】 林盈杰；

【导师】 邓智泉；

【作者基本信息】 南京航空航天大学 ， 电机与电器， 2005， 硕士

【摘要】 无轴承电机是一种能够同时实现转矩控制与悬浮控制的新型电机,与传统磁悬浮电机悬浮机理不同,它利用磁轴承结构和交流电机定子结构的相似性,把电枢绕组和悬浮控制绕组共同绕制在电机的定子上,利用悬浮绕组产生的磁场来改变电机内气隙磁场的分布,从而实现转轴的悬浮工作。 由于无轴承电机从根本上改变了传统的轴承或磁轴承支撑型式,具有无磨损、无需润滑、密封性好、功率密度高、转轴刚度大以及寿命长等一系列优良品质,在能源交通、航空航天、机械工业及机器人等高科技领域具有广泛的应用前景。 本文阐述了无轴承异步电机的基本工作原理,针对无轴承异步电机数学模型,分析了无轴承异步电机采用磁场定向控制的相关特性。分析了悬浮控制耦合的原因,研究了基于 SPWM 原理的磁链跟踪逆变器,用以对悬浮绕组进行控制,解决了悬浮绕组转子感应电流对悬浮控制的影响。通过对电机气隙磁场的探测或辨识,实现了悬浮子系统的独立控制。分析了谐波磁密在悬浮控制系统中的作用,并在探测线圈测量气隙磁场算法中采用相应的方法减小其对悬浮控制的影响,提高了悬浮控制的精度。除此之外,还研究了转子偏心时所测磁密与实际磁密之间的关系,并分析了用探测线圈检测转子位移的可能性。 最后,设计并实现了基于 TMS320F2812 的数字控制硬件系统和软件系统。更多还原

【Abstract】 The bearingless motor is a new type of motor which hybridizes the motors and the magnetic bearings. Different from the traditional suspension principle of magnetic suspension motor, the bearingless motor winds the levitation windings together with conventional motor windings to produce radial forces by taking advantages of the similarity between the structure of magnetic bearing and that of the AC motor. The rotor shaft can be successfully suspended by the electromagnetic forces. As the bearingless motor is constructed with contact-free bearings, it works free of wear, frictionless, free of abrasion and without lubrication. With these advantages and other features, the bearingless motor demonstrates the potential applications in space technology, machine tools, high vacuum technology, ultra high-speed drives and so on. This paper first expounds the basic principle of bearingless induction motor, then analyzes some characteristics of flux orientation control contraposing the mathematical model of bearingless induction motor. For the levitation winding, the method of air-gap flux traced PWM is proposed to eliminate coupling of levitation control caused by neglecting rotor current of the levitation winding. The independent control of levitation subsystem is realized based on magnetic flux detecting with search coils or with the method of voltage-model. The affect of harmonics and rotor eccentricity is analyzed when measuring the air-gap flux density, and the possibility of measuring the shaft displacement with search coils is also studied. A digital control system for real-time control is designed with single DSP (TMS320F2812). Experimental results validate the performance efficiency of the proposed controller in steady state, as well as transient state. Acknowledge the grants of National Nature Science Foundation of China (50377012), National Defense Foundational Science Research of China (K1600060603), and Delta Electric & Electronics Science & Education Development Foundation.更多还原