內藏式永磁同步馬達由於永久磁鐵埋藏在轉子中，結構上不但具有強健性且適合高速運轉，此外由於d-q軸電感比值高，因此可藉由弱磁控制達到較高的轉速。在輸出轉矩方面，除了電磁轉矩外，還加上磁阻轉矩之貢獻，可得到較高的轉矩輸出，故此型馬達可視為永磁馬達與磁阻馬達之結合，適用於電動機車等電動載具方面之應用。在本研究中，將以相同永久磁鐵體積、定子外型與繞線限制條件下，利用有限元素法分析四種不同轉子結構之內藏式永磁同步馬達，針對不同型式之轉子結構作相關的特性分析，如頓轉扭矩、反電動勢常數與d-q軸電感等，並用圓線圖法（Circle diagram）表示電壓及電流限制之下，各型馬達所能操作之最大範圍，最後說明如何藉由圓線圖法畫出四種轉子之輸出特性曲線，以提供馬達設計者作為設計時參考的依據，並了解各型馬達所適用的特殊場合。

　　Because the permanent magnets are embedded in the rotor of an IPM synchronous motor, the structure is robust enough to operate at high speed region. In addition, the ratio of d-q-axes inductances is high so that this type of motors can be applicably driven by flux weakening for higher speed operation. On the other hand, there are two components of output torque: electromagnetic torque and reluctance torque. An IPM synchronous motor becomes a hybrid between PM motor and synchronous reluctance motor and is particularly suitable for electric scooters. Under the condition that the stator topology, winding and the amount of rotor permanent magnets are kept identical, the characteristics analysis of four kinds of IPM rotors based on Finite Element Analysis is proposed in this thesis, such as cogging torque, back-EMF constant and d-q-axes inductances. The circle diagram is used to illustrate the maximum operation area of each rotor. Finally, the T-N curves are established from the circle diagram to reflect the variation of the maximum toque and speed zones of distinct rotors, in order to provide relevant designers with bench mark for IPM motors.

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