【作者】 彭薇；

【导师】 张凤阁； Ahn Jin-Woo；

【作者基本信息】 沈阳工业大学 ， 电机与电器， 2012， 硕士

【摘要】 无轴承开关磁阻电机（BLSRM）是在传统开关磁阻电机基础上发展起来的一种新型电机。它结合了开关磁阻电机的优越性能，以及无轴承电机的无磨损、无摩擦等优点，在高速电机、航天等领域有着广泛的应用前景。无轴承开关磁阻电机在同一个定子极上设有两套绕组，分别为主绕组和径向力绕组，产生的径向力能够实现轴承的悬浮。但是，其径向力和转矩存在着耦合关系，这使径向力的控制变得很困难。本文提出了一种新型双定子无轴承开关磁阻电机，它的内定子产生使转子悬浮的径向力，外定子产生旋转转矩。和以往的无轴承开关磁阻电机相比，双定子无轴承开关磁阻电机可以实现转矩和径向力的解耦，并且在任意的转子角度都有稳定的径向力能够产生，所以能够用更加简单的控制方法用来控制转子的悬浮。为了验证新型结构，对双定子BLSRM的结构和运行原理进行了介绍，基于之前对无轴承开关磁阻电机的研究结果，建立了其x轴方向和y轴方向上径向力的数学模型。运用有限元分析方法，在转子偏心和不偏心位置的情况下对两套定子绕组的电感，转矩和径向力进行了分析。通过分析，可以看到新型无轴承开关磁阻电机的径向力具有线性的特性并且独立于转矩电流，因此转矩和径向力的解耦控制可以实现。推导出对径向力的控制策略，并利用Simulink仿真验证了控制策略的正确性与有效性，搭建了实验系统。实验结果表明，电机能够稳定运行，转矩绕组电流对悬浮力影响非常小，悬浮绕组电流对电机输出转矩基本没有影响，这证明了双定子无轴承开关磁阻电机及其控制策略的有效性。更多还原

【Abstract】 Bearingless switched reluctance motor (BLSRM) is a new type of motor whichdeveloped on the basis of traditional switched reluctance motor (SRM). It not only hassuperior performance of SRM, but also has a good feature of bearingless motors, such asno abrasion and no friction. It will be widely used in high speed motor, aerospace and soon. BLSRM have two kinds of stator windings composed of motor main windings andradial force windings in the same stator in order to produce the radial force that can realizerotor shaft suspension. However, the radial force of BLSRM is coupled with the rotationaltorque, and the control of radial force is very difficult.In this paper, a novel BLSRM with double stator is proposed. Inside stator generatesradial force to suspend the rotor. Outside stator produces rotational torque. Compared withthe previous BLSRM, decoupling control between torque and radial force can be realizedin double stator BLSRM, at the same time, a wide and almost constant radial force can beachieved at any rotor position with a given current, so a simpler control algorithm ispossible to be applied to implement suspend the rotor.To verify the proposed structure, a novel structure and operating principle arepresented. Based on the existing work of previous researches for BLSRM, mathematicalmodels of the radial force in x-axis and y-axis direction are deduced. Through finiteelement method (FEM) analysis, the characteristics such as inductance, torque and radialforce profiles of two stator windings are analyzed with the cases of non-eccentric andeccentric rotor. From the analysis, the proposed BLSRM has linear characteristic of radialforce and independence from torque current, decoupling control between torque and radialforce can be realized. Meanwhile in order to realize steady suspension, control scheme ofdesired radial force is proposed. Some simulation results are shown to verify the validity ofcontrol strategy. The experiment system is constructed. From experiment results, it can beseen that the motor can operate steadily, the torque current has almost no effect on thesuspending force and the suspending force current also has almost no effect on the output torque, which further verifies the validity of the double stator BLSRM and its controlscheme.更多还原