本文選題：軸向磁密電機(jī) + 不平衡磁拉力　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著稀土永磁材料和制造工藝的發(fā)展,軸向磁密電機(jī)性能得到了極大的提高。與傳統(tǒng)的徑向磁密電機(jī)相比,其具有結(jié)構(gòu)簡單、軸向長度短、運(yùn)行可靠、散熱好和功重比大等顯著優(yōu)點(diǎn),廣泛應(yīng)用于大功率、高功率密度以及有特殊安裝要求的場合。但是,電機(jī)通常為含脈動(dòng)激勵(lì)的對稱系統(tǒng),因此必然產(chǎn)生和徑向磁密電機(jī)相同的振動(dòng)和噪聲問題,進(jìn)而影響電機(jī)的性能和使用壽命。本文以軸向磁密電機(jī)為例,研究了拓?fù)浣Y(jié)構(gòu)對振動(dòng)特性的影響,主要內(nèi)容如下:針對軸向磁密電機(jī)的槽頻激勵(lì),采用疊加方法定性地研究了槽極配合與不平衡磁拉力和脈動(dòng)轉(zhuǎn)矩之間的激起和抑制關(guān)系,提出了相應(yīng)的振動(dòng)抑制方法。在此基礎(chǔ)上,還揭示了與槽極配合密切相關(guān)的三種典型受力模式:軸向平移扭轉(zhuǎn)模式、徑向平移扭擺模式和平衡模式。上述研究對振動(dòng)預(yù)測具有指導(dǎo)意義。為了驗(yàn)證解析結(jié)論的正確性,本文采用麥克斯韋張量法計(jì)算了該類電機(jī)的徑向、切向和軸向磁拉力。將力沿坐標(biāo)方向投影,得到了不平衡磁拉力和脈動(dòng)轉(zhuǎn)矩。三維靜態(tài)電磁場有限元分析結(jié)果證明了理論推導(dǎo)的正確性。最后進(jìn)行了定子橫向受迫振動(dòng)研究。本文采用哈密頓原理建立了盤型結(jié)構(gòu)的動(dòng)力學(xué)模型。該模型計(jì)入了由電機(jī)氣隙旋轉(zhuǎn)磁場產(chǎn)生的磁拉力對剛度攝動(dòng)的影響,揭示了電機(jī)基本參數(shù),如氣隙長度、極對數(shù)、極弧系數(shù)等與電機(jī)定子響應(yīng)之間的映射關(guān)系。本文工作為國家自然科學(xué)基金《基于相位調(diào)諧的永磁電機(jī)減振降噪機(jī)理研究》(編號:50705062)的一部分,同時(shí)也為國家自然科學(xué)基金《旋轉(zhuǎn)超聲動(dòng)力拓?fù)溥x型研究》(編號:51175370)工作的一部分。論文工作為軸向磁密電機(jī)的減振降噪提供了一定的理論依據(jù)。
[Abstract]:With the development of rare earth permanent magnet materials and manufacturing technology, the performance of axial magnetic density motor has been greatly improved. Compared with the traditional radial magnetic density motor, it has the advantages of simple structure, short axial length, reliable operation, good heat dissipation and high power / weight ratio. It is widely used in high power, high power density and special installation situations. However, the motor is usually a symmetric system with pulsating excitation, so it will inevitably produce the same vibration and noise problems as the radial magnetic density motor, which will affect the performance and service life of the motor. In this paper, the influence of topology on the vibration characteristics of axial magnetic dense motor is studied. The main contents are as follows: aiming at the slot frequency excitation of axial magnetic density motor, The superposition method is used to qualitatively study the excitation and suppression relationship between slot matching and unbalanced magnetic pull force and pulsating torque, and a corresponding vibration suppression method is proposed. On this basis, three typical stress modes closely related to the coordination of grooves are revealed: axial translational torsion mode, radial translational torsional pendulum mode and balance mode. The above research is of guiding significance for vibration prediction. In order to verify the correctness of the analytical conclusions, the radial, tangential and axial magnetic pull forces of this kind of motors are calculated by Maxwell Zhang Liang method. The unbalanced magnetic pull force and pulsating torque are obtained by projecting the force along the coordinate direction. The results of finite element analysis of three-dimensional static electromagnetic field prove the correctness of the theoretical derivation. Finally, the transverse forced vibration of the stator is studied. In this paper, the dynamic model of disk structure is established by using Hamiltonian principle. The model takes into account the effect of the magnetic pull force generated by the rotating magnetic field of the air gap on the stiffness perturbation, and reveals the mapping relationship between the basic parameters of the motor, such as air gap length, polar logarithm, polar arc coefficient, and the stator response of the motor. This paper is a part of the National Natural Science Foundation of China, "study on the Mechanism of Vibration and noise reduction of permanent Magnet Motor based on Phase tuning" (No.: 50705062). It is also a part of the work of National Natural Science Foundation of China "Research on Topology selection of rotational Ultrasonic Dynamics" (No. 51175370). The work of this paper provides a theoretical basis for reducing vibration and noise of axial magnetic density motor.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM351

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本文編號：1911024