Fault-tolerant magnetic bearing control system architecture
First Claim
1. A bearing arrangement for devices comprising rotating and stationary members utilizing a magnetic field for levitating and controlling the positions of the rotating members along axes which include the axis of rotation and axes orthogonal thereto comprising control means including closed loop rotor position controller means comprising a first signal processing means and separate vibration sensing means comprising a second signal processing means which generates an open loop perturbation signal wherein the closed loop rotor position means includes one enabled closed-loop rotor position controller means and one disabled closed-loop rotor position controller means and the vibration sensing means simultaneously enables the disabled closed-loop rotor position controller means and disables the enabled closed-loop rotor position controller means if vibration sensed by the vibration sensing means exceeds a predetermined level.
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Abstract
A fault-tolerant control system for a magnetic bearing arrangement which maximizes dynamic response of the control system is disclosed. The arrangement includes a main digital signal processor responsive to rotor position/velocity signals to supply control signals to bearing control coils and a secondary digital signal processor responsive to accelerometer signals to provide open-loop vibration control for correction of mass imbalance of the rotor system. In addition, sources of vibration which have fundamental frequencies at some multiple of the rotor system rotational frequency can also be controlled.
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Citations
8 Claims
- 1. A bearing arrangement for devices comprising rotating and stationary members utilizing a magnetic field for levitating and controlling the positions of the rotating members along axes which include the axis of rotation and axes orthogonal thereto comprising control means including closed loop rotor position controller means comprising a first signal processing means and separate vibration sensing means comprising a second signal processing means which generates an open loop perturbation signal wherein the closed loop rotor position means includes one enabled closed-loop rotor position controller means and one disabled closed-loop rotor position controller means and the vibration sensing means simultaneously enables the disabled closed-loop rotor position controller means and disables the enabled closed-loop rotor position controller means if vibration sensed by the vibration sensing means exceeds a predetermined level.
Specification