本文關(guān)鍵詞： 高速電機(jī) 機(jī)械強(qiáng)度 臨界轉(zhuǎn)速 諧響應(yīng)　出處：《沈陽(yáng)工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：高速電機(jī)以其體積小、功率密度大等優(yōu)點(diǎn)使其在以高速加工為代表的各場(chǎng)合獲得普遍應(yīng)用。但是,因?yàn)橛懈咿D(zhuǎn)速的特征,所以也對(duì)高速電機(jī)與從動(dòng)部分的連接以及轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)特性帶來(lái)了新的挑戰(zhàn),是以針對(duì)轉(zhuǎn)子系統(tǒng)的動(dòng)力學(xué)特性分析及研究得到業(yè)界普遍地關(guān)注。為此,根據(jù)實(shí)際需要,本文針對(duì)一臺(tái)設(shè)計(jì)額定轉(zhuǎn)速為30000r/min的高速永磁電動(dòng)機(jī),對(duì)其轉(zhuǎn)子的機(jī)械強(qiáng)度進(jìn)行分析,然后分析其轉(zhuǎn)子及其軸承組成的轉(zhuǎn)子系統(tǒng)的若干動(dòng)力學(xué)性能,主要研究轉(zhuǎn)子的不平衡量對(duì)轉(zhuǎn)子動(dòng)態(tài)性能的影響。首先,詳細(xì)介紹等效圓環(huán)法的原理,建立等效圓環(huán)法的數(shù)學(xué)模型,用等效法對(duì)永磁體兩段的內(nèi)置式電機(jī)的機(jī)械強(qiáng)度進(jìn)行分析,并與有限元法進(jìn)行對(duì)比,證明等效法分析內(nèi)置式電機(jī)的有效性;對(duì)在不同工作狀態(tài)、不同過盈量和不同護(hù)套厚度情況下工作的表貼式電機(jī)的機(jī)械強(qiáng)度進(jìn)行分析,確定了永磁體和護(hù)套過盈量的大小。其次,對(duì)轉(zhuǎn)子系統(tǒng)進(jìn)行模態(tài)分析并提取其固有頻率、臨界轉(zhuǎn)速和Campbell圖等模態(tài)參數(shù)。研究證實(shí)各階模態(tài)的固有頻率都遠(yuǎn)大于轉(zhuǎn)子系統(tǒng)本身的固有頻率,所以轉(zhuǎn)子系統(tǒng)不會(huì)發(fā)生共振現(xiàn)象,在轉(zhuǎn)速為36000r/min的情況下能夠穩(wěn)定運(yùn)轉(zhuǎn)。然后分析了不同軸承剛度等級(jí)對(duì)轉(zhuǎn)子臨界轉(zhuǎn)速的影響,以及轉(zhuǎn)子軸伸長(zhǎng)度對(duì)電機(jī)轉(zhuǎn)子系統(tǒng)臨界轉(zhuǎn)速的影響,得到軸承剛度和軸伸長(zhǎng)度跟轉(zhuǎn)子臨界轉(zhuǎn)速的關(guān)系曲線圖。最后,對(duì)高速旋轉(zhuǎn)的轉(zhuǎn)子系統(tǒng)進(jìn)行諧響應(yīng)分析。分析得到轉(zhuǎn)子系統(tǒng)在不同軸承剛度和受到不平衡力作用在不同位置時(shí)的振動(dòng)響應(yīng)曲線圖,振動(dòng)的偏移量滿足電機(jī)的設(shè)計(jì)要求。
[Abstract]:Because of its small size and high power density, high-speed motor has been widely used in various situations represented by high-speed machining. However, it has the characteristics of high speed. Therefore, it also brings new challenges to the connection between high-speed motor and follower and the dynamic characteristics of rotor system, which is widely concerned by the industry by analyzing and studying the dynamic characteristics of rotor system. According to the actual needs, this paper analyzes the mechanical strength of a high speed permanent magnet motor with a rated speed of 300r / min. Then the dynamic performance of the rotor system composed of its rotor and its bearing is analyzed, and the influence of the rotor unbalance on the rotor dynamic performance is mainly studied. Firstly, the principle of the equivalent ring method is introduced in detail. The mathematical model of the equivalent ring method is established, and the mechanical strength of the built-in motor is analyzed by the equivalent method, and compared with the finite element method, the validity of the equivalent method is proved. The mechanical strength of surface mount motor working in different working state, different interference amount and different sheathed thickness is analyzed, and the size of permanent magnet and sheath interference is determined. The modal analysis of rotor system is carried out and the modal parameters such as natural frequency, critical speed and Campbell diagram are extracted. It is proved that the natural frequency of each mode is much larger than the natural frequency of rotor system itself. Therefore, the rotor system does not have resonance phenomenon and can operate stably at 36000r / min. Then, the influence of different bearing stiffness levels on the critical speed of rotor is analyzed. And the influence of rotor shaft elongation on the critical speed of motor rotor system, the relationship between bearing stiffness and shaft elongation and rotor critical speed is obtained. Finally. The harmonic response of the rotor system with high speed rotation is analyzed and the vibration response curve of the rotor system under different bearing stiffness and unbalance force at different positions is obtained. The offset of vibration meets the design requirements of the motor.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM351

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本文編號(hào)：1446735