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D. Wimmer, M. Hutterer, M. Schrödl:
"Space Vector Modulation for High Dynamic Current Control of a Self-Sensing Active Magnetic Bearing";
Talk: ISMB17, Rio de Janeiro, Brazil; 2021-08-18 - 2021-08-22; in: "17th International Symposium on Magnetic Bearings", (2021).

The control loop of active magnetic bearings requires feedback of the rotor position to enable a stable levitation of the rotor. In contrast to conventional position sensor-based systems, self-sensing control can lead to a far more simple design of the system. The focus of this study lies on a high dynamic control of a self-sensing three-phase radial active magnetic bearing. The self-sensing operation is based on the detection of coil inductance deviations of an eccentrically levitating rotor. The inductance of the actuator coils is obtained by current slope measurements in the phases of the bearing. For this reason, special voltage pulse patterns are applied to the coils, which are defined by the half-bridges of a three-phase inverter. The required voltage pulse patterns are defined by a space vector modulation in a digital signal processor. In this work, a variant of space vector modulation is presented, which allows a high dynamic of the current controller under consideration of self-sensing aspects. Finally, the designed modulation strategy was investigated with simulations and measurements on a prototype of a radial active magnetic bearing.

magnetic bearings, sensor-based systems,

https://www.magneticbearings.org/publications/