Abstract:

Under the condition of high-precision rotor speed signal extraction problem in magnetic suspension flywheel active vibration suppression without a speed sensor, firstly, an improved Hilbert transform rotor speed estimation method is put forward, and through this method, the rotor speed of high precision can be got with only one kind of radial rotor displacement signals; then this rotor speed signal is introduced into the simulation model of the magnetic suspension flywheel unbalanced vibration suppression, and this speed estimation method is analyzed in this simulation system; finally the rotor speed estimation method based on the improved Hilbert transform has been verified on the magnetic suspension flywheel prototype. Simulation and experimental results show that this method has good adaptability in both cases of variable and constant rotor speed, and after introducing speed estimate signal, the unbalanced vibration has attenuated by 80% or more within the working rotor speed scope of the magnetic suspension flywheel.

Key words: Magnetic suspension flywheel, Improved Hilbert transform, Rotor speed estimation, Notch filter, Unbalanced vibration suppression