磁鐵輔助式磁阻馬達轉子改良設計與熱固磁耦合分析

本論文著重在磁鐵輔助式磁阻馬達的轉子設計與熱固磁耦合分析，透過磁障形式探討與最佳化分析，得到力矩達220Nm之最佳化馬達，相較原型馬達稀土磁石用量減少17.9%，並利用本研究成果之最佳化馬達進行熱固磁耦合分析，探討轉動離心力與熱膨脹對氣隙大小與馬達性能影響，得到轉動離心力所造成的轉子形變，使氣隙略微縮小，讓氣隙磁通密度上升，在結構強度安全之轉速內，對性能造成影響最大為2%，而熱膨脹使氣隙隨著溫度上升而變大，讓氣隙磁通密度隨溫度上升而逐漸下降，在溫度180度內，對性能造成影響最大為4.3%，結合轉動離心力與熱膨脹對性能所造成影響最大為3.2%。

關鍵字

磁鐵輔助式磁阻馬達；稀土磁鐵；離心力；熱膨脹；熱固磁耦合分析

並列摘要

This study focuses on the rotor design and thermo-structure-magnetic coupling analysis of the Permanent Magnet Assisted Synchronous Reluctance Motor (PMaSynRM). Through the discussion and optimization analysis of the magnetic barrier, an optimal motor having 220Nm is obtained. The usage of the rare earth permanent magnet is 17.9% less than the prototype motor. And use the optimized motor to conduct thermo-structure-magnetic coupling analysis to explore the influence of centrifugal force and thermal expansion on the air gap size and motor performance. The rotor deformation caused by the centrifugal force causes the air gap size slight reduction and the air gap flux density slight increase. It is obtained that the influence of centrifugal force on motor performance is within 2% within the safe speed of motor structural strength. Thermal expansion causes the air gap to become larger as the temperature rises so that the air gap flux density gradually decreases with the temperature rise. The maximum influence of thermal expansion on performance is 4.3% within 180 degrees Celsius. The maximum influence on motor performance caused by the combination of centrifugal force and thermal expansion is 3.2%.