- 學位論文
使用信號注入法量測轉子徑向位移的方法探討
Rotor Radial Displacement Measurement Using Signal Injection Method
摘要
在磁懸浮系統中，為達到轉子位移量測的目的需藉由徑向位置感測器取得轉子徑向位移的資訊，但有許多特殊環境不易安裝此類位置感測裝置，例如人工心臟等體積較小、系統空間受到限制的情況，且大部分位移感測器容易受環境溫度和濕度影響產生損壞。綜合上述原因，發展出信號注入法(Signal Injection Method)偵測磁轉子之徑向位置。信號注入法減少了系統成本及系統的體積，因此在控制精確度要求不高或無法安裝感測器的場合，信號注入法更得以廣泛應用。本文旨在探討磁轉子無感測器的徑向位移量測、信號的處理以及感測系統的改善，首先理論分析為基礎，接著說明當轉子氣隙產生變化時，系統的電流及電感的變化關係，並提出信號注入法偵測轉子徑向位移的概念，最後再以實驗驗證其系統可行性。
並列摘要
The measuring of rotor displacement in a Magnetic suspension system is obtained by collecting information of rotor radial displacement by radial position sensors. However, many kinds of special environments make it difficult to install these types of position sensors, such as artificial hearts or small-size systems which have limited space. Furthermore, most displacement sensors are easily affected and damaged by the surrounding temperature and humidity. Based on the above, we developed a signal injection method to detect the radial position of magnetic rotors. This signal injection method reduces system costs and size. When the control of precision does not require high standards, or the system situation is unable to install sensor devices, the method may become even more broadly applied. The purpose of this study is to explore the measuring of radial displacement for magnetic rotors sensorless devices, signal processing and sensor system improvement. By using theoretical analysis as basis, the study further discussed the system’s current-induction relation with changes of the rotor gap and proposed the concept of detecting rotor radial displacement by the signal injection method. Experiments were then conducted to verify the performance of the system.