Bias current control circuit
AssigneeMechanical Technology Incorporated
InventorRichard A. Dorman
Life of this patent
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Abstract
A control system for a magnetic bearing includes a sensor which generates an output representative of the relative shaft position. The signal from the sensor is processed by an integrator and offset adjustment block and a difference amplifier to subtract the processed sensor signal from a reference voltage. The difference signal result is fed to a bias control circuit including voltage dividers which generates a voltage which is received by coil current power amplifiers for both the upper and lower magnetic coils. Coil currents are then generated to stabilize the magnetic bearing.
Claims9
A control system for a magnetic bearing, the magnetic bearing including a rotor responsive to a shaft and a stator including upper and lower magnetic coils, the control system including:
- sensor means for determining a relative position of the shaft;
- means for integrating and offsetting said relative position of the shaft;
- means for subtracting an output of said means for integrating and offsetting from a reference voltage;
- bias current control means responsive to said means for subtracting, said bias current control means including voltage dividers which generate a voltage output;
- coil current amplifier means receiving said voltage output from said bias current control means, said coil current amplifier means generating a current to the upper and lower coils of the magnetic bearing.
Dependencies are inferred from the claim text.