Dynamic characteristics of a rotor system with 3-pad bidirectional GFB and high speed motor

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 218-225.

CHENG Wenjie1, DENG Zhikai1, XIAO Ling1, ZHONG Bin2, ZHANG Bo3, SUN Yanhua4, DUAN Wenbo5

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Abstract

Taking a permanent magnet synchronous motor with 10 kW and 120 000 r/min ultra-highspeed as a test prototype, tests were conducted to study dynamic behavior of arotor system with 3-pad bidirectional gas foil bearing (GFB) and high-speed motor. The 3-pad bidirectional GFB’s load-bearing features were analyzed, natural frequencies of conical and parallel whirling modes of the elastically supported rotor system were calculated based on an appropriate simplification ofbearing stiffness and damping coefficients. 30 000 r/min and 60 000 r/min speed-up tests and a 90 000 r/min free deceleration test were conducted on the prototype. Test results showed that the take-off speed of the rotor is about 4 000 r/ min; when the rotor running at 90 000 r/min, there is a strong sub-synchronous whirl frequency, it is completely caused by the system itself; the rotor system with 3-pad bidirectional GFB has a better stability; the theoretical analysis and test results here provide a reference for designing ultra-high speed permanent magnet motor shafting and its dynamic analysis.

Key words

3-pad bidirectional-foil bearing (GFB) / ultra-high-speed motor / sub-synchronous whirl / rigid body mode / rotor dynamics

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CHENG Wenjie1, DENG Zhikai1, XIAO Ling1, ZHONG Bin2, ZHANG Bo3, SUN Yanhua4, DUAN Wenbo5. Dynamic characteristics of a rotor system with 3-pad bidirectional GFB and high speed motor[J]. Journal of Vibration and Shock, 2021, 40(1): 218-225

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