本文選題：鐵芯損耗 + 直流偏置磁場　； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：電機(jī)在運(yùn)行過程中不可避免地會產(chǎn)生損耗,而損耗除了會降低電機(jī)的運(yùn)行效率,還會使電機(jī)內(nèi)部溫度上升,降低電機(jī)運(yùn)行可靠性。相對于銅耗、機(jī)械損耗等,鐵芯損耗由于其產(chǎn)生原理更為復(fù)雜,更難以計(jì)算準(zhǔn)確。尤其當(dāng)電機(jī)接入變頻器之后,鐵芯損耗在高頻諧波下,甚至可能高于銅耗。故,鐵芯損耗的準(zhǔn)確計(jì)算對于提高電機(jī)效率以及增加運(yùn)行壽命至關(guān)重要。在永磁電機(jī)、開關(guān)磁阻電機(jī)等運(yùn)行過程中,鐵芯將受到直流偏置磁場的作用,而直流偏置磁場對于鐵芯損耗也會產(chǎn)生較大的影響,故本文著重從直流偏置磁場對于鐵芯損耗的影響入手進(jìn)行實(shí)驗(yàn)研究。本文搭建了材料測試實(shí)驗(yàn)平臺,通過實(shí)驗(yàn)對50WW800硅鋼片進(jìn)行研究,測量在不同交流激勵與直流偏置下,鐵磁材料中的直流偏置磁場大小,并得到直流偏置磁感應(yīng)強(qiáng)度與直流偏置磁場強(qiáng)度的關(guān)系,并實(shí)驗(yàn)求得交流磁場幅值對它的影響。之后,在大量實(shí)驗(yàn)的基礎(chǔ)上,通過數(shù)據(jù)擬合的方式,得到磁場強(qiáng)度與磁感應(yīng)強(qiáng)度以及直偏磁場的關(guān)系,并對未測量直偏磁場下的材料磁滯回線進(jìn)行預(yù)測計(jì)算,預(yù)測準(zhǔn)確度較高,誤差很小。最后,通過磁滯回線與磁滯損耗的關(guān)系,得到損耗與交、直流磁感應(yīng)強(qiáng)度的關(guān)系,并擬合得到曲面函數(shù),實(shí)驗(yàn)數(shù)據(jù)越多,數(shù)據(jù)庫擬合得到的曲面將越準(zhǔn)確,通過數(shù)據(jù)庫結(jié)合有限元軟件計(jì)算,得到帶氣隙圓環(huán)樣品鐵芯的損耗,與實(shí)際測量值對比,驗(yàn)證數(shù)據(jù)庫準(zhǔn)確性。最后驗(yàn)證結(jié)果良好,誤差均小于4%。
[Abstract]:The loss of the motor will inevitably occur in the process of operation, and the loss will not only reduce the efficiency of the motor, but also increase the internal temperature of the motor and reduce the reliability of the motor. Compared with copper consumption and mechanical loss, iron core loss is more complicated and more difficult to calculate accurately. Especially when the motor is connected to the inverter, the core loss may even be higher than the copper consumption under the high frequency harmonics. Therefore, the accurate calculation of core loss is very important to improve motor efficiency and service life. In the operation process of permanent magnet motor and switched reluctance motor, the core will be affected by the DC bias magnetic field, and the DC bias magnetic field will also have a great influence on the core loss. So this paper focuses on the effect of DC bias magnetic field on core loss. In this paper, a material test platform is set up, and the 50WW800 silicon steel sheet is studied through experiments. The magnitude of DC bias magnetic field in ferromagnetic material is measured under different AC excitation and DC bias. The relationship between DC bias magnetic induction intensity and DC bias magnetic field intensity is obtained, and the effect of AC magnetic field amplitude on it is obtained experimentally. After that, on the basis of a large number of experiments, the relationship between magnetic field intensity, magnetic induction intensity and direct bias magnetic field is obtained by the way of data fitting, and the hysteresis loop of material under unmeasured magnetic field is forecasted and calculated, and the prediction accuracy is high. The error is small. Finally, through the relationship between hysteresis loop and hysteresis loss, the relationship between loss, AC and DC magnetic induction intensity is obtained, and the surface function is fitted. The more experimental data, the more accurate the surface will be obtained by database fitting. Through the calculation of database and finite element software, the loss of sample iron core with air gap ring is obtained, and compared with the actual measurement value, the accuracy of the database is verified. The results are good and the errors are less than 4.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM301;TM271

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