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Abstract: To improve stability of magnetically suspended rotor system in magnetically suspended control moment gyroscope (MSCMG) at high gimbal rotation speed, linearization of nonlinear force-current-displacement characteristic and relevant control algorithm of magnetic bearing (MB) are investigated. Operating point variation of MB with gimbal rotation is analyzed, and a novel method of variant operating-point lineariza-tion referring to gimbal speed is proposed. Linear parameter varying model of MB is achieved and adaptive control algorithm incorporating gain-scheduled and feedforward corre-sponding to gimbal
speed is designed to compensate displacement stiffness rising due to gimbal running and current asscending, which increases gimbal speed from 6.25 (°)/s to 9.5 (°)/s under condition of stable MB-rotor system according to experimental results. It can be concluded that the proposed method can compensate MB force nonlinearity and improve MB-rotor system stability significantly at high gimbal speed.
Key words: Control moment gyroscope Magnetic bearing
Moving-gimbal effects Nonlinearity
Linearization Gain-scheduled
CLC No: TP273+.2 V448.22
国家高技术研究发展计划(863计划, 2003AA741022). Received 20060613, received in revised form 20070228
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