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

点击翻译按钮获取中文摘要

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.