大功率高速永磁电机柔性转子系统模态分析

doi:10.19595/j.cnki.1000-6753.tces.L70425

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Abstract For high speed machine, it is far more vulnerable when the rated speed close to critical speed. Under this circumstance, severe vibration will occur and even damage the rotor. For high-power high-speed machine, the rotor length is much greater than the diameter of the rotor. It needs to be designed as a flexible rotor system. The rated speed passes through the first-order critical speed, working in the security zone between the first-order critical speed and the second-order critical speed. But the scope of this security zone is very small, which brings great difficulties in designing high-power high-speed motor rotor system. In this paper, based on a 1.12MW, 18 000r/min high-speed permanent magnet (PM) machine, the dynamic characteristics of rotor system are analyzed theoretically, while the rotor modal and critical speed are also calculated. And then, the influencing factors on rotor critical speed are analyzed, including bearing stiffness, gyroscopic effect and the rotor main dimensions. Finally, a prototype is manufactured and a rotor vibration test is developed. The experimental results have validated the rotor critical speed analysis. It would provide the reference to rotor system design for high-power high-speed machine.

Key words： High speed machine, critical speed, flexible rotor, rotor modal, bearing stiffness, gyroscopic effect

Received: 19 August 2016 Published: 05 December 2017

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TM355

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	Du Guanghui
	Huang Na
	Zhang Fengge
	Wang Tianyu

Cite this article:

Du Guanghui,Huang Na,Zhang Fengge等. Modal Analysis of the Flexible Rotor System for High-Power High-Speed Permanent Magnet Machine[J]. Transactions of China Electrotechnical Society, 2017, 32(22): 101-107.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L70425 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I22/101

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