Study of Bearingless Motor with Rectifier Circuit Coil

本研究提出并发展一种新型无轴承马达。无轴承电机是一种驱动力和轴承力的产生机制相结合的执行器。所提出的无轴承电机的特点是具有带整流电路线圈的转子。整流电路线圈通过单向感应电流使转子沿固定方向磁化。在本研究中，我们进行了以下工作：1.通过仿真和实验验证了所提出的无轴承电机在单向磁化点上的可行性。实验结果验证了所提出的无轴承电机结构的正确性。2.制作了第一台无轴承电机样机并进行了试验。该电机为径向磁化型，转子和定子的齿为矩形。实验结果表明，由于感应磁化的原因，该样机不能产生足够的转矩和力。3.对无轴承电机的结构进行了有限元分析。结果，转子和定子的齿形必须在彼此面对的部分处做得更宽。考虑到获得更大的转矩，减小转子转角对转矩和力的影响，计算了旋转和悬浮所需的合适齿宽。4.制作了第二台无轴承电机样机。悬浮检查成功了。现在我们来研究转子旋转时的旋转和悬浮性能。5.作为进一步的研究，我们必须制作无轴承电机并对其性能进行测试。除此之外，我们还将制作另一种无轴承电机，即轴向磁化型。

In this research a novel type of bearingless motor was proposed and developed. Bearingless motors are classified as actuators whose generating mechanisms for driving and bearing force are combined. The feature of the proposed bearingless motor is having a rotor with rectifier circuit coils. The rectifier circuit coils can magnetize the rotor in a fixed direction by one-way induced current. In this research, we carried out as follows.1.The feasibility of the proposed bearingless motor on the point of one-way magnetization was examined by simulations and examinations. As the result, we can verify the construction of the proposed bearingless motor.2.First prototype bearingless motor was made and examined. The motor is a radial magnetization type and the teeth of the rotor and the stator have rectangular shape. As the results of examinations this prototype fails in generating enough torque and forces because of luck of induced magnetization.3.FEM analysis were carried out for the construction of the bearingless motor. As the results, the teeth shape of the rotor and stator must be made more wide at the part facing each other. We calculated proper width of the teeth for rotating and levitating considering i) obtain more large torque, ii) reducing the impact of rotor angle for torque and force.4.The second prototype bearingless motor was made. The levitation examination were succeeded. Now we examine the performance of rotation and levitation when the rotor rotates.5.As the further study, we must made up the bearingless motor and examine the performance. In addition to this examination, we will make another type of bearingless motor, the axial magnetization type.