針對全球能源效率標準的升級，低壓三相鼠籠式感應電動機效率標準被強制提升至IE3等級。因此，本文提出使用低損耗矽鋼片和銅棒轉子分別替代一般矽鋼片及鑄鋁轉子以降低鐵損和轉子銅損。文中實際設計及製作二台6極、250HP之三相感應電動機，區分為實驗組和對照組進行效益改善分析，並引用經驗公式及矽鋼片鐵損曲線計算鐵損減少的變化。由實測結果得知，鐵損量測值與預測值接近，鐵損可有效被改善。至於轉子銅損的降低，則透過計算銅棒及其端環電阻，以評估轉子銅損可減少的比例。本文亦使用Flux 2D有限元素法分析定子和轉子槽的靜態磁場，以確保磁通密度低於飽和值且磁力線維持平滑分佈。
本文採用之IEEE 112-A、IEEE 112-B和CNS 5421，分別為效率測試的動力計法、損失分離法以及圓線圖法。三種效率測試的結果分別為95.97％、95.90％及96.10％，均高於IE3最低效率95.80％的要求。此外，由於提高效率需同時考慮電機啟動性能，實際測試銅棒轉子的啟動轉矩為270.1 kg-m，大於NEMA標準要求的額定轉矩 183.1 kg-m；而銅棒轉子的啟動電流量測值為2108A，低於Code G所規定的2191A。鑄鋁轉子及銅棒轉子實際測試中獲得的啟動轉矩和啟動電流，亦進一步藉由CNS 5421提出的三種計算方法得到驗證。綜言之，本文的低壓三相鼠籠式感應電動機效率已達IE3等級，且其啟動轉矩與啟動電流亦均符合國際相關規範之要求。

In response to the upgrade of global energy efficiency standards, the efficiency of low-voltage three-phase squirrel-cage induction motor is mandatorily upgraded to class IE3. Therefore, this thesis proposes to reduce the iron and rotor copper losses by using low-loss silicon steel sheet material and copper-bar rotor to replace silicon steel sheets and cast-aluminum rotor, respectively. Two 6-pole, 250HP, three-phase induction motors are designed and built, and the experimental as well as its counterpart groups are formed for benefit improvement analysis. The empirical formula and silicon iron loss curves are introduced to calculate the range of iron loss reduction. The measured results agree closely with the predicted values, and indicate that the core loss can be effectively improved. As to the reduction of rotor copper loss, copper-bar and its end ring resistance are calculated to assess the proportion that the copper loss of the rotor can be decreased. In addition, finite element method of Flux 2D is used to analyze the static magnetic field of the stator and rotor slots to ensure smooth flux line distribution with flux density lower than the saturation value.
The IEEE 112-A, IEEE 112-B and CNS 5421, which are the methods for dynamometer evaluation, measurement of stray-load loss as well as the efficiency test with circle diagram, respectively, are adopted to evaluate the motor designed. The corresponding efficiencies are 95.97%, 95.90% and 96.10%. All are higher than the minimum efficiency of 95.80% required by IE3. Meanwhile, since efficiency improvement needs to take motor starting performance into consideration, real test yields the starting torque of 270.1 kg-m for the motor with copper-rotor bar, which is larger than the rated torque of 183.1 kg-m as required by NEMA standard. Besides, starting current measurement gives 2,108A for the motor with copper-bar rotor, which is smaller than 2,191A as specified by Code G. Both the starting torques and currents obtained from real test for the motors with cast-aluminum rotor as well as copper-bar rotor are further confirmed by the three calculation methods proposed by CNS 5421. In short, the efficiency of the proposed low-voltage three-phase squirrel-cage induction motor is upgraded to class IE3 with its starting torque and starting current comply with international standard.

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