Development of Self-Sensing Control Technique for a Self-Bearing Motor

考虑了自感电机的应用，特别是在硬盘驱动器和人工心脏泵等小型应用中。这些系统要求执行器的小型化和低功耗。特别是执行机构的小型化是系统开发的重要主题。然而，自轴承电机是一种主动控制系统，它需要一定类型的传感器。传感器与执行机构的非配置会导致控制性能不理想，传感器设置空间的存在成为小型化的严重障碍。克服这些问题。本课题提出了基于差动变压器原理的自感知控制技术。首先，通过理论分析和静态自感知实验，阐明了电机绕组与控制绕组之间的互感对径向位移具有线性特性。其次，在驱动和检测电路中采用降噪、安装附加谐振电路和适当调节自感知输出带宽的方法来控制转子，而不需要任何外部传感器。最后，在特定角度位置实现了自感知悬浮控制。同时，承载转子位移信息的载体元件随着永磁转子的角度位置和控制电流的值而变化。因此，带旋转的悬浮控制不能继承这些不良性质。然而，它显示出良好的性能，作为一个配置传感器的悬浮控制和非常高的可能性，自轴承电机的自传感控制。

Application of self-sensing motor is considered, especially for small application such as a hard disk drive and an artificial heart pump. These systems require miniaturization and row power consumption of the actuator. Especially miniaturization of the actuator is the most important theme of the system development. However self-bearing motor is an active control system, which requires a certain type of sensor. Noncollocate configuration of the sensor and actuator might cause undesirable control property and existence of the sensor setting space becomes serious obstacle for miniaturization. To overcome these problems. this project proposes self-sensing control technique based on the principle of differential transformer.First, it was clarified that the mutual inductances between each of motoring windings and control windings has linear property for the radial direction displacement in both theoretical analysis and static self-sensing experiments. Next, noise reduction, installation of additional resonant circuit and appropriate regulation of the bandwidth of the self-sensing outputs were applied to the driving and detecting circuits to control rotor without any external sensors. Finally, self-sensing levitation control was succeeded at a specific angular position. Simultaneously the carrier component, which possesses information of the rotor displacement, changes by the angular position of the permanent magnet rotor and the value of control current. Hence the levitation control with rotation could not succeeded by those undesirable properties. However it shows a good property as a collocated sensor just levitation control and very high possibility of the self-sensing control of the self-bearing motor.