Patent ID: 8620522

Claim:
A method to manage the output of a servo valve, comprising: receiving a plurality of commands representative of a desired piston position; generating, from the plurality of commands, a plurality of position difference signals which represent a difference between a desired piston position and a current piston position; generating, from the plurality of position difference signals, a plurality of magnetic flux target signals, wherein the magnetic flux target signals represent a desired magnetic flux measurement in the servo valve; generating, from the plurality of magnetic flux target signals, a plurality of magnetic flux difference signals which represent a difference between a desired magnetic flux measurement and a current magnetic flux measurement; and regulating the servo valve using the magnetic flux difference signals, wherein regulating the servo valve using the magnetic flux difference signals comprises: generating a magnetic flux by inducing a level of electrical coil current corresponding to the magnetic flux difference signal; measuring the total magnetic flux in a servo torque motor coupled to the servo valve; adjusting the magnetic flux measurement by compensating for the magnetic flux contribution attributable to one or more permanent magnets in the servo motor.