【摘要】：目前,為滿足新能源領(lǐng)域?qū)Φ退俅筠D(zhuǎn)矩電機的要求,一些學者將磁齒輪與永磁電機相結(jié)合提出一種新型“偽”直驅(qū)復合式電機。該復合式電機采用共軸式結(jié)構(gòu),通過調(diào)磁環(huán)來調(diào)制內(nèi)轉(zhuǎn)子永磁體產(chǎn)生的磁場,與外轉(zhuǎn)子永磁體產(chǎn)生的磁場相互耦合,從而將內(nèi)置式永磁電機轉(zhuǎn)矩放大。為獲得高轉(zhuǎn)矩密度,磁齒輪復合式電機采用大量稀土永磁體,高速運行狀態(tài)下永磁體中的渦流損耗較大,易使永磁體因電機內(nèi)部溫度過高發(fā)生不可逆退磁。因此,為提高磁齒輪復合式電機的可靠性,避免永磁體高溫退磁,對復合式電機的永磁體損耗特性以及如何有效降低渦流損耗的研究具有重要的實際價值。本文對復合式電機的調(diào)制原理進行論述與驗證,分析了復合式電機的轉(zhuǎn)矩和渦流損耗特性,研究并總結(jié)產(chǎn)生恒定轉(zhuǎn)矩和渦流損耗的空間諧波組成成分,并提出一種新型串聯(lián)spoke內(nèi)轉(zhuǎn)子復合式電機結(jié)構(gòu)。該新型結(jié)構(gòu)考慮永磁體渦流損耗以及磁齒輪電機轉(zhuǎn)矩與內(nèi)置永磁電機轉(zhuǎn)矩的平衡問題,使得新型串聯(lián)spoke結(jié)構(gòu)電機與傳統(tǒng)表貼式電機相比具有輸出轉(zhuǎn)矩幾乎不變、渦流損耗降低明顯的優(yōu)勢。本文基于以上問題開展以下幾個方面的研究:1.采用解析法對磁齒輪復合電機的調(diào)制原理進行分析與論述,并通過二維有限元仿真對復合式電機的調(diào)制原理進行驗證。2.對磁齒輪復合式電機的調(diào)制作用原理分析,總結(jié)出產(chǎn)生轉(zhuǎn)矩、渦流損耗的諧波成分。對內(nèi)外轉(zhuǎn)子永磁體渦流損耗進行計算與對比,證明渦流損耗主要集中在內(nèi)轉(zhuǎn)子永磁體上,為下文通過改變內(nèi)轉(zhuǎn)子永磁體結(jié)構(gòu)減小渦流損耗、提高電機效率提供理論依據(jù)。3.從內(nèi)轉(zhuǎn)子磁路耦合與非耦合結(jié)構(gòu)以及不同調(diào)制比兩個角度出發(fā),分別分析內(nèi)轉(zhuǎn)子永磁體磁路耦合與非耦合以及不同調(diào)制比對磁齒輪復合式電機轉(zhuǎn)矩和渦流損耗特性的影響�；谝陨蟽蓚�角度電機特性的分析,進一步驗證內(nèi)轉(zhuǎn)子永磁體結(jié)構(gòu)對電機轉(zhuǎn)矩和渦流損耗特性的影響。4.基于磁齒輪復合電機稀土材料用量一定的條件,創(chuàng)新性的提出內(nèi)轉(zhuǎn)子永磁體串聯(lián)spoke結(jié)構(gòu),并用有限元分析軟件Ansoft對所提出結(jié)構(gòu)進行了二維仿真驗證,且與已存在的表貼式結(jié)構(gòu)樣機進行對比驗證,證明新型串聯(lián)spoke結(jié)構(gòu)在降低永磁體渦流損耗方面的優(yōu)勢。
[Abstract]:At present, in order to meet the requirements of low-speed and high-torque motors in the field of new energy, some scholars have proposed a new type of "pseudo-direct-drive compound motor" by combining magnetic gear with permanent magnet motor. The compound motor adopts coaxial structure and modulates the magnetic field generated by the permanent magnet of the inner rotor by adjusting the magnetic ring, which is coupled with the magnetic field generated by the permanent magnet of the outer rotor, thus amplifying the torque of the built-in permanent magnet motor. In order to obtain high torque density, a large number of rare earth permanent magnets are used in the magnetic gear composite motor. The eddy current loss in the permanent magnet under high speed operation is large, which makes the permanent magnet irreversibly demagnetization due to the excessive internal temperature of the motor. Therefore, in order to improve the reliability of magnetic gear composite motor and avoid high temperature demagnetization of permanent magnet, it is of great practical value to study the characteristics of permanent magnet loss of composite motor and how to reduce eddy current loss effectively. In this paper, the modulation principle of compound motor is discussed and verified, and the characteristics of torque and eddy current loss of composite motor are analyzed, and the spatial harmonic components that produce constant torque and eddy current loss are studied and summarized. A new structure of series spoke inner rotor composite motor is proposed. The new structure takes into account the eddy current loss of permanent magnet and the balance between the torque of the magnetic gear motor and the built-in permanent magnet motor, which makes the output torque of the new series spoke motor almost unchanged compared with the traditional surface motor. The eddy current loss reduces the obvious advantage. Based on the above questions, this paper studies the following aspects: 1. The modulation principle of magnetic gear composite motor is analyzed and discussed by analytic method, and the modulation principle of composite motor is verified by two-dimensional finite element simulation. By analyzing the modulation principle of magnetic gear composite motor, the harmonic components of torque and eddy current loss are summarized. The eddy current loss of the inner and outer rotor permanent magnet is calculated and compared. It is proved that the eddy current loss is mainly concentrated on the inner rotor permanent magnet, which provides a theoretical basis for reducing the eddy current loss and improving the motor efficiency by changing the structure of the inner rotor permanent magnet. Based on the coupling and uncoupling structure of inner rotor magnetic circuit and different modulation ratio, the effects of magnetic circuit coupling and non-coupling of inner rotor permanent magnet and different modulation ratio on torque and eddy current loss characteristics of magnetic gear composite motor are analyzed respectively. Based on the analysis of the characteristics of the motor at the above two angles, the influence of the permanent magnet structure of the inner rotor on the torque and eddy current loss characteristics of the motor is further verified. Based on a certain amount of rare earth material of magnetic gear composite motor, a series spoke structure of inner rotor permanent magnet is innovatively proposed, and the structure is verified by two-dimensional simulation with finite element analysis software Ansoft. Compared with the existing surface structure prototype, it is proved that the new series spoke structure can reduce the eddy current loss of permanent magnet.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM35

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本文編號：2250520