Dynamic Characteristics Analysis of Magnetically Levitated Rotors Considering Unbalanced Magnetic Pull and Alford Force
The dynamic characteristics of a multi-electric aero-engine simulation rotor system supported by magnetic bearings,including the unbalanced magnetic pull (UMP) of a switch reluctance motor and the Alford force excited by the compressor blade tip airflow,were analyzed.The simulation rotor system was established based on Timoshenko beam theory and the finite element method,the UMP of the 12/8-pole three-phase switch reluctance motor and the airflow-excited Alford force were introduced.The calculation results show that the motor's UMP reduces the rotor's critical speed,but when the Al-ford force is present,the motor's UMP will increase the rotor's stability threshold.The Alford force and motor magnetic pull introduce various harmonic and sub-harmonic excitations.And as the speed changes,the rotor exhibits different dynamic characteristics.Changing the control parameters of the magnetic suspension bearings can alter the rotor's equilibrium posi-tion,motion trajectory and amplitude,indicating that active control of the engine rotor can be achieved by adjusting these control parameters to change the rotor's kinetic characteristics.
vibration and wavemulti-electric aero-engineactive magnetic bearingunbalanced magnetic pullAlford forcerotordynamics
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