本文關鍵詞：永磁同步電機損耗計算及溫度場分析　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 永磁同步電機 損耗 溫度場 驗證實驗

【摘要】：近些年來,永磁同步電機逐漸在各個領域得到廣泛應用,日益成為人們生產(chǎn)和生活不可或缺的一部分。永磁同步電機在運行的過程中會產(chǎn)生損耗,這些損耗會通過熱量的形式逸散出來,使電機內(nèi)部溫度升高。當溫度高達一定程度,會引發(fā)永磁體的磁性下降、繞組表面絕緣層脫落等事故,降低電機運行的可靠性。因此,在電機的設計中,對永磁同步電機內(nèi)部的損耗和溫度場進行準確計算至關重要。本課題以一臺功率為750W的交流永磁同步電機為分析對象,對其損耗和溫度場進行研究。對電機的繞組反電勢、空載氣隙磁密進行了探究,通過對所得波形進行傅里葉變換,研究發(fā)現(xiàn)繞組反電動勢和氣隙磁密的波形比較近似于正弦,且諧波含量小,驗證了電機基本運行性能的可靠性和電磁場分析模型建立的合理性。計算了電機的損耗。根據(jù)鐵耗的分離理論,對定子鐵芯建立損耗計算模型,基于時步有限元相關理論,對定子內(nèi)部磁場進行分析,分別計算了在交變磁場作用、加入旋轉(zhuǎn)磁場作用及加入旋轉(zhuǎn)磁場和諧波共同作用下的定子鐵耗。比較幾種方法的計算結(jié)果,發(fā)現(xiàn)加入旋轉(zhuǎn)磁場和諧波影響下的定子鐵耗計算方法最為準確。對多種工況下的定子繞組銅耗、轉(zhuǎn)子和永磁體的渦流損耗及機械損耗進行了計算。分析了轉(zhuǎn)速、負載等因素對于損耗的影響。對電機進行溫度場分析。依據(jù)流體力學、傳熱學的相關知識,建立了電機的三維溫度場計算模型,設定求解域的初始和邊界條件,求解溫度場分析的參數(shù)。對電機在自然冷卻和強制風冷條件下不同工況時的溫度場進行有限元分析。探究了電機內(nèi)部各處的溫度場及強制風冷參數(shù)對電機溫升的影響規(guī)律。進行電機的損耗和溫升實驗。測出樣機在空載時的機械損耗和定子鐵耗,與計算值進行對比,研究表明,加入旋轉(zhuǎn)磁場和諧波影響的永磁同步電機鐵耗計算方法最為準確。記錄電機在自然風冷和強制風冷條件下運行時繞組的溫升,將所測結(jié)果和仿真結(jié)果對比,發(fā)現(xiàn)二者繞組穩(wěn)態(tài)溫度的誤差不超過3℃,驗證了對永磁同步電機溫度場分析方法的正確性。
[Abstract]:In recent years, the permanent magnet synchronous motor has been widely used in various fields, has become an indispensable part of people's life and production. The permanent magnet synchronous motor will produce a loss in the process of running, these losses will pass out in the form of heat dissipation, the temperature of the motor increases. When the temperature is up to a certain extent, will lead to permanent magnet magnetism decreased, insulating layer off accident winding surface, reducing the running reliability of the motor. Therefore, in the design of the motor, the permanent magnet synchronous motor internal loss and temperature field of the accurate calculation is very important. This subject to a power of 750W permanent magnet synchronous motor as the analysis object study on the loss, and the temperature field. The back electromotive force of the motor winding, air gap magnetic field have been studied by Fourier transform of the waveform, the study found that the winding back EMF and The waveform of air gap flux density is similar to the sine, and small harmonic content, verifies the rationality of establishing reliability and electromagnetic field analysis model of motor basic performance. Loss of the motor is calculated. According to the theory of separation of iron loss, the calculation model of stator core loss is established, based on the finite element theory, the internal the magnetic field of stator is analyzed, were calculated in the alternating magnetic field, with rotating magnetic field and adding a rotating magnetic field and harmonic wave under the action of stator iron loss. Comparing the calculation results of several methods, found that adding a rotating magnetic field and harmonic wave under the influence of stator iron loss calculation method is the most accurate. On the stator winding copper loss under various conditions the eddy current loss and mechanical loss of the rotor of the permanent magnet are calculated. Analysis of the speed, load and other factors for the loss. The influence of temperature field analysis of the motor according to the fluid. Mechanics, related knowledge of heat transfer, the establishment of the three-dimensional temperature field of the motor model, setting the initial and boundary conditions for solving domain and solving parameters of temperature field analysis. The motor in the natural cooling and forced air cooling under different working conditions of the temperature field of finite element analysis. The influence of temperature field and forced air cooling parameters on inside the motor everywhere on the temperature rise of the motor. The motor loss and temperature rise experiment. Measure the prototype in no-load stator iron loss and mechanical loss, compared with the calculated value research shows that the calculation method is the most accurate consumption of iron permanent magnet synchronous motor with rotating magnetic field and harmonic. The motor operation record in the natural air cooling and forced air cooling conditions when winding temperature rise, the measured results and simulation results, it is found that the two error of steady winding temperature does not exceed 3 degrees, the verification of permanent magnet synchronous motor The accuracy of the method of temperature field analysis.

【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM341

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本文編號：1382707