Characteristics of thermal-bow vibration in an active magnetic bearing supported rotor

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (4) : 36-47.

JIN Chaowu，DONG Yue，SU Hao，XU Yuanping，ZHOU Jin，YAN Xu

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Abstract

The thermal-bow vibration induced by the concentration of the iron loss in active magnetic bearing (AMB) supported rotor was studied. The changing principle of the thermal-bow vibration was studied according to the working principle of the AMB. The iron loss obtained by Bertotii’s separation theory was set as the heat source, and combing the support characteristics of AMBs, the thermal-structural vibration equation was established to obtain the thermal-bow vibration. In addition, an iterative calculation method was employed to upgrade the calculation conditions and obtain the vibration response until the vibration converges or diverges. The calculation results show that the overall temperature of the rotor is strongly related to the rotation frequency. The temperature difference at journal circumference is mainly decided by the vibration amplitude. The location of the hot spot and the thermal bow direction are related to the vibration direction, and they determine the changing of the vibration.

Key words

active magnetic bearing / thermal bow vibration / electromagnetic loss

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JIN Chaowu，DONG Yue，SU Hao，XU Yuanping，ZHOU Jin，YAN Xu. Characteristics of thermal-bow vibration in an active magnetic bearing supported rotor[J]. Journal of Vibration and Shock, 2022, 41(4): 36-47

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