Active Control of Active Magnetic Bearings for Maglev Flywheel Rotor System Based on Sliding Mode Control

Flywheel unit is one of the most important ways to storage and recovery energy in electric vehicles. In order to realize high energy density, flywheel unit always work at high speed. The active magnetic bearing (AMB) based flywheel unit is often used. Normal PID controller used in the AMB-rotor system of the AMB flywheel unit cannot effectively suppress rotor unbalance disturbance. A sliding mode control (SMC) system is designed and improved based on Sigmoid function in this paper. The effectiveness of the PID and SMC controller is analyzed by simulation. It is shown that the Sigmoid function based SMC has obvious advantages in suppressing unbalance disturbance of AMB-rotor system.

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