本文提出一種基於雙級式永磁馬達驅動架構中，藉由直流鏈電壓可連續調變的特性，以固定調制係數於特定範圍的策略，將系統操作於該工作點之下的最高系統效率，並結合以固定調制係數的方法，在直流鏈電壓達調變最大值時將馬達進行弱磁控制，進一步延伸高速性能。首先在固定脈衝寬度調變的載波頻率情況下分析系統的損失與諧波來源，發現系統損失雖會隨調制係數上升而下降，但當調制係數超過特定點時，電流的偶次諧波成分會上升，使系統損失再次上升，因此存在一調制係數範圍使系統損失呈最小值；經過模擬與實測發現該值在非弱磁區約為0.83~0.85。此外，驅動器損失來源包含脈衝寬度調變的載波頻率，結合馬達參數與脈衝寬度調變之特性，載波頻率選擇上應取兩者交集之值。經過實測驗證不同運轉條件確實存在系統損失最小值之調制係數與載波頻率，提出之方法在非弱磁與弱磁階段皆能使系統穩定運行，能有效擴展雙級式驅動器架構的高速運轉範圍，具備良好實務應用潛力。

This thesis proposes a strategy for achieving maximum system efficiency in a dual-stage motor drive architecture by utilizing the continuously adjustable characteristic of the DC-Link voltage. The system is operated at a fixed modulation index within a specific range to maintain optimal efficiency at a given operating point. Additionally, when the DC-Link voltage reaches its maximum modulation limit, a field-weakening control is applied to further extend the high-speed performance using the fixed modulation index method. First, under the condition of a fixed PWM carrier frequency, the system’s losses and current harmonics are analyzed. It is observed that the system loss decreases with the modulation index increases, once the index exceeds a certain point, the even-order harmonic components in the current rise, causing the losses to increase. Therefore, there exists a range of modulation indexes that yield minimum system loss. In the constant-torque region, simulation results indicate that the optimal modulation index is approximately 0.83~0.85. Furthermore, the sources of inverter losses include the PWM carrier frequency. Considering both motor parameters and PWM modulation characteristics, the carrier frequency should be chosen based on the intersection of these factors. Experimental results verify that, under different operating conditions, there indeed exists an optimal modulation index and carrier frequency that minimize system losses. The proposed method ensures stable operation in both the constant-torque the field-weakening region, effectively extending the high-speed operating range of the dual-stage motor drive architecture and demonstrating strong potential for practical application.

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