Study on the principle of self-sensing rotor displacement of self-sensing magnetic bearing

This paper presents a novel self-sensing control technique for magnetic bearings,namely it can detect displacement signal without position sensor.We mainly research the rotor position estimation method of self-sensing magnetic bearings.The position information of rotor can be extracted from the coil currents or voltage,which contain the high frequency components due to the injected high frequency voltage without any additional hardware.The effectiveness of the position estimation has been verified by simulation results.