摘要
MRI(Magnetic Resonance Imaging)磁振造影系統藉由三軸(X、Y、Z)梯度線圈掃描，由三軸量測得之訊號，經由主系統端電腦分析及處理後可得待測物之3D立體影像。本研究之梯度線圈將由兩軸(X、Y)梯度線圈，Z軸方面將以機械式的驅動系統搭配控制系統來完成Z軸的驅動平台，達到3D立體影像呈現之目的。 平台架構主要分成兩大部分，驅動系統及控制系統，亦為本研究著重之重點，驅動系統主要由H橋驅動電路之設計及分析，使得直流馬達得以正反轉，平台得以順暢的前進及後退作動。控制部分主要由單晶片PIC30f4011作為控制器，由控制器做運算來判別平台位置是否達到所設定之定位點，感測器部份由光學尺做平台位置的訊號回授，控制演算法以PID(比例、積分、微分控制)及模糊滑動控制(Fuzzy Sliding Mode)演算法作為控制演算法，實驗測試結果顯示此平台定位精度可達設定之μm級誤差範圍。
並列摘要
Magnetic Resonance Imaging system scans with gradient coils of three axis(X,Y,Z),the signal of measurement from three axis can be deal with and analysis by way of the computer of system ,it could get the 3D images of analyte.In this study,the composition of gradient coils from X axis and Y axis.For the Z axis ,it will composite by a drive system with a mechanical and control system to finish the driver platform of Z axis.It could achieve the purpose of rendering 3D images. The Platform architecture is divided into two parts,driver system and control system.It is the focus of this study,the drive system primarily for H-bridge driver circuit design and Analysis,such as the DC motor can clockwise rotation and counterclockwise rotation,the platform can make a smooth move forward and backward.Control part primarily for MCU PIC30F4011 as the controller,judge the position of platform whether arrive the set point from the controller to operation,sensor part is the feedback signal of position of platform,control algorithms with PID algorithms and fuzzy sliding mode algorithms, by observing the results of the platform position control whether the error range of μm level.