Optimal Efficiency Design of IPM Brushless DC Motor for Air Conditioners

Abstract

[[abstract]]室內空調機之送風馬達，大多採用傳統的交流感應馬達。其轉子側感應電流產生轉矩，造成二次側銅損，降低效率。近年來永磁無刷直流馬達強調運轉安靜與高效率，已逐漸取代傳統送風馬達。 本論文利用有限元素分析軟體MagneForce進行120度方波驅動之空調用內藏式無刷直流馬達特性分析，針對其效率提升進行研究。由於馬達在結構設計上的差異程度會影響到整體特性及效率，本文以變更原始結構如氣隙寬度、磁石厚度及線圈線徑等來模擬馬達的輸出特性，並作為最佳化實驗因子。最後配合田口法、模糊田口法與雙反應曲面法預估各種組合，依照新的參數來搜尋出效率最高的馬達幾何結構。[[abstract]]Of blower motor for air conditioners, mostly uses traditional the AC induction motor. Its rotor side induced current has the torque, creates secondary copper losses, cuts the efficiency. In recent years emphasized the permanent magnet motor quiet operation and high efficiency, has substituted for the tradition blower motor gradually. In this paper, the use of finite element analysis software MagneForce to 120 degrees square drive of characteristic analysis for interior permanent magnet-type brushless DC motor for air conditioners, in view of its efficiency promotion conducts the research. Due to the structural design of the motor in the extent of the differences will affect the overall characteristics and efficiency, in order to change the original structure of this paper, such as air-gap width, magnet thickness and coil diameter, and so on simulate motor's output characteristics, and as optimization experiment factor. Finally, with the Taguchi method ,fuzzy-based Taguchi experimental design method and dual response surface method predicted a variety of combinations, in accordance with the new parameters to search for maximum efficiency of motor geometry