Abstract
本文旨在建立一兼具最大轉矩與最大效率能力，並可補償鐵損所造成 失調影響的高性能轉子場導向控制器． 基本上，本文貢獻可歸納為五 大項： 首先作者提出一個型式簡單且與頻率，磁通量，轉差，有正確明 顯解析關係的感應馬達鐵損模型． 其次作者提出一個考量鐵損的影響且 與傳統動態方程式有相同型式的感應馬達動態模型． 第三，以此模型為 基礎，應用到轉子場導向控制時，傳統轉子場導向控制法則的數學型式可 以保存，只需對係數稍加修加，即可補償鐵損對場導向控制的影響，如此 可以很容易的應用到現有的控制器上． 同時本文對所提包含鐵損的感應 馬達動態模型，分析在不同的負載及速度時，鐵損對轉子磁通，扭力，導 向角等轉子場導向控制性能的影響．第四，本文推導了考量鐵損時，感應 馬達最大轉矩與最大效率條件，值得一提的是在轉子場導向控制條件下， 最大轉矩條件與最小電流條件相同． 最後以本文所提的感應馬達動態方 程式及轉子場導向條件為基礎，提出了一個非常簡單而且可以整體考量高 穩態效率與快速動態反應的控制器，使感應馬達控制系統具備了快速動態 反應，高穩態效率控制架構簡單的特性．雖然本文只進行模擬研究，但考 量結構簡單，兼具快速動態反應與高穩態效率，本文所提的轉子場導向控 制法則在實體製作上深具應用價值. This dissertation attempts to provide a high performance Rotor-Field- Oriented (RFO) controller which is able to drive the induction motor in both maximum torque and maximum efficiency conditions without incurring the detuning effect induced by iron loss. Basically, contributions of this dissertation are in fivefolds. Firstly, the author proposes an ideal iron loss model which has not only a very simple form but also provides accurate and analytic relation with frequency, flux and slip. Secondly, the author presents a more accurate dynamic model ofinduction motors considering the effect of iron loss, which can preserve the simple form of conventional induction motor dynamic model. Thirdly, by applying the proposed iron loss model to the rotor-fielfluxand slip. Secondly, RFOC can be also preserved. Only the coefficients need to be modified. The effect of iron loss on the RFOC drives can be compensated without adding any extra decouping circuit. So, it is easy to apply thd-Oriented-Control roposed method to the existing RFOC drives. Also, the anald-Oriented-Control (RFOC),yticexpressions of the detuning effect of iron loss on flux, torque and RFO angleare derived for evaluating the effects under different load and velocity conditions. Fourthly, both the maximum torque and maximum efficiency condi tions including the iron loss are derived. It is also found that under RFOC the maxximum torque condition in fact implies the minimum line currentin steady state case. Lastly, based on the proposed dynamic model of the induction motor together with the integrated consideration of efficiency andfast dynamic response, a very simple RFOC is proposed. Although, only simulation studies are conducted, however, from the viewpoints of fast response, high efficiency and simple control configuratin, it is believedthat the proposed controller is very promising.