Application of Rotor Unbalance Compensation to AMB-Based Gyroscopic Sensor

An AMB-based gyroscopic sensor is studied in this paper. The sensor has been proposed to realize high-accuracy, compact and low-cost sensors. In this sensor, active magnetic bearing (AMB) is applied to a rate-integrating gyro that measures angular velocity. Two-axis angular velocities are estimated from the control currents canceling gyroscopic torque acting on the AMB rotor. The sensor has detected angular velocity precisely. However, the measured angular velocities include oscillating components due to rotor unbalance. This paper presents an elimination method of the components due to the unbalance.