本文關鍵詞： 高速電機 機械強度 臨界轉速 諧響應　出處：《沈陽工業(yè)大學》2016年碩士論文　論文類型：學位論文

【摘要】：高速電機以其體積小、功率密度大等優(yōu)點使其在以高速加工為代表的各場合獲得普遍應用。但是,因為有高轉速的特征,所以也對高速電機與從動部分的連接以及轉子系統(tǒng)動力學特性帶來了新的挑戰(zhàn),是以針對轉子系統(tǒng)的動力學特性分析及研究得到業(yè)界普遍地關注。為此,根據實際需要,本文針對一臺設計額定轉速為30000r/min的高速永磁電動機,對其轉子的機械強度進行分析,然后分析其轉子及其軸承組成的轉子系統(tǒng)的若干動力學性能,主要研究轉子的不平衡量對轉子動態(tài)性能的影響。首先,詳細介紹等效圓環(huán)法的原理,建立等效圓環(huán)法的數學模型,用等效法對永磁體兩段的內置式電機的機械強度進行分析,并與有限元法進行對比,證明等效法分析內置式電機的有效性;對在不同工作狀態(tài)、不同過盈量和不同護套厚度情況下工作的表貼式電機的機械強度進行分析,確定了永磁體和護套過盈量的大小。其次,對轉子系統(tǒng)進行模態(tài)分析并提取其固有頻率、臨界轉速和Campbell圖等模態(tài)參數。研究證實各階模態(tài)的固有頻率都遠大于轉子系統(tǒng)本身的固有頻率,所以轉子系統(tǒng)不會發(fā)生共振現象,在轉速為36000r/min的情況下能夠穩(wěn)定運轉。然后分析了不同軸承剛度等級對轉子臨界轉速的影響,以及轉子軸伸長度對電機轉子系統(tǒng)臨界轉速的影響,得到軸承剛度和軸伸長度跟轉子臨界轉速的關系曲線圖。最后,對高速旋轉的轉子系統(tǒng)進行諧響應分析。分析得到轉子系統(tǒng)在不同軸承剛度和受到不平衡力作用在不同位置時的振動響應曲線圖,振動的偏移量滿足電機的設計要求。
[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.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM351

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