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四、如果有一台三相八極,380 V,50 Hz 之同步電動機的定子電阻可以忽略,而其每相等效同步電抗為 0.75 Ω。若此電動機的鐵芯及旋轉機械損失均可以忽略,當輸入額定電壓並連接一大小為 3.0 k
問題詳情
四、如果有一台三相八極,380 V,50 Hz 之同步電動機的定子電阻可以忽略,而其每相等效同步電抗為 0.75 Ω。若此電動機的鐵芯及旋轉機械損失均可以忽略,當輸入額定電壓並連接一大小為 3.0 kW 之機械負載至此電動機之轉軸時,其操作功因為 0.9滯後。試問在不改變此同步電動機激磁的前提下,此同步電動機在理論上可以提供的最大功率為多少 W?而此時對應的電動機轉子機械轉速為多少 rpm?輸出轉矩又為多少牛頓-米(N-m)?(25 分)
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