本論文係對於內嵌式永磁同步電動機驅動器提出新型的線性轉矩控制策略，以充分發揮其磁阻轉矩，並仍保有線性轉矩控制的優點。以下則摘要地敘述本論文的主要貢獻。首先針對內嵌式永磁同步電動機在定轉矩極限區之運轉提出一新型的線性轉矩控制策略，使得輸出轉矩與線電流空間向量的大小成正比，其中已經推導並證明得到此線性轉矩控制的一個充分條件，並獲得對應的最大轉矩常數，且在控制上也推導出直交軸電流的封閉數學關係式。此一新型線性轉矩控制策略不但可以充分發揮內嵌式永磁同步電動機之磁阻轉矩，並且可以明顯地增加其定轉矩極限的轉速範圍，因此採用此控制策略可以使內嵌式永磁同步電動機在較高轉速具有比表面黏著式永磁同步電動機更好的性能。其次，吾人再將此線性轉矩控制觀念由定轉矩極限區延伸到更高速的弱磁區，其中不僅推導出其直交軸電流之數學解析式，並建立全區域運轉的理論基礎。本論文可說是在國際上首次將內嵌式永磁同步電動機的轉速區域分為定轉矩極限區、部分弱磁區與全弱磁區三區域，並明確說明如何採用定轉矩極限控制模式或弱磁控制模式以充分利用其磁阻轉矩，其中並提出一個隨轉速不同而改變大小的轉矩限制器，以簡化其實體製作之複雜性。為了進一步減少內嵌式永磁同步電動機穩態運轉時之銅損，並且保持動態運轉時快速的響應，吾人再提出一線性最大轉矩電流比控制策略，並將該控制策略延伸到全轉速區域，有關其詳細理論基礎均詳述於本論文中。最後，為獲得更精確的轉矩控制，吾人進一步考量內嵌式永磁同步電動機之磁飽和效應，即採用一個三階多項式以更精確的近似交軸磁交鏈的磁飽和效應，並根據此新模型推導及實現新的線性最大轉矩電流比控制策略。除了上述理論基礎之推導與模擬分析外以，在本論文中並依所創理論實際製作一雛型驅動器，由其實測結果與理論分析結果互相驗證，證明本論文所創新之方法確實可行並能達到預期成效。

In this dissertation, new torque control strategies for interior permanent magnet synchronous motor (IPMSM) drives are proposed to fully exploit the reluctance torque as well as to preserve the merit of the simple linear torque control scheme. Main contributions of the dissertation are summarized as follows. Firstly, a novel linear torque control strategy is presented for IPMSM drives in the constant torque limit region such that the resulting torque is proportional to the line current magnitude. A sufficient condition for the existence of the linear torque control is derived and the corresponding torque constant is also maximized. In addition, a closed form relation between the and for the proposed torque control strategy is derived. Not only can the proposed linear torque control strategy fully exploit the reluctance torque to provide a much wider constant torque operation region, but also provide a much better performance at high speed region as compared with that of the surface mounted PMSM. Secondly, a new field weakening control of a linear torque controlled IPMSM drive is presented. The proposed control further extends the operational speed range of the previous linear torque control (LTC) from the constant torque limit range to the field weakening range such that the IPMSM drive can operate over much wider speed range. The theoretical basis of the proposed field weakening control is first proposed and the corresponding analytical forms are also derived. The entire operational regions of an IPMSM are divided into three regions according to the motor speed, namely the constant torque limit region (Region I), the partial field weakening region (Region II), and the full field weakening region (Region III). However, only two control modes, namely the constant torque limit control mode and the field weakening control mode, are required. A region detector is proposed to choose the correct control mode efficiently according to the motor speed and the demanded torque. In addition, to fully utilize the maximum torque capability in the field weakening region, a variable line current magnitude limiter is also proposed to simplify the complexity of the control algorithm. Thirdly, a linear maximum torque per ampere (LMTPA) control is proposed for IPMSM drives to further minimize the copper loss during the steady state operation as well as to achieve fast transient response. The proposed LMTPA is also extended to the entire field weakening region to achieve full range maximum torque per ampere control. Sound theoretical basis is also provided in the context. Finally, a new saturated q-axis flux linkage model for an IPMSM is proposed and the corresponding LMTPA control strategy over the full operational speed range is derived. Experimental results are provided to show the improvements of the dynamic as well as the steady state performances for these proposed linear torque control strategies.

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