Estimation Method and Measurement Bandwidth of Gyroscopic Sensor using Active Magnetic Bearing

A gyroscopic sensor using active magnetic bearings (AMB) is studied in this paper. The sensor utilizes the control function of AMB and works as a two-axis gyroscopic sensor and also as a three-axis servo-type accelerometer. This paper focuses on angular velocity measurement. Angular velocities are estimated from the control signals for canceling gyroscopic and inertial toques acting on the shaft of the AMB. In measuring two-axis angular velocity simultaneously, there is a limit of the measuring range. In this paper, several numerical simulations and experiments with a conventional-size AMB are used to investigate this limit. In addition, the relationship between the measurement range and the control system is shown.