Suppressing electrical failure effects in servo control systems

A system to manage the output of a servo valve, comprising:

• a first plurality of feedback loops to receive a plurality of commands representative of a desired piston position and to generate, 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;
• a plurality of amplifiers to generate, from the plurality of position difference signals, a corresponding plurality of magnetic flux target signals;
• a second plurality of feedback loops to receive, from the plurality of amplifiers, the plurality of magnetic flux target signals, wherein the magnetic flux target signals represent a desired magnetic flux measurement in the servo valve, and to generate, 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
• an assembly to regulate the servo valve using the plurality of magnetic flux difference signals, wherein the assembly to regulate the servo valve comprises:
• a plurality of current amplifiers and coils to generate a magnetic flux by inducing a level of coil current corresponding to the magnetic flux difference signal;
• a plurality of magnetic flux sensors to measure the total magnetic flux in a servo torque motor coupled to the servo valve;
• a plurality of conditioners to adjust the magnetic flux measurements by compensating for the magnetic flux contribution attributable to one or more permanent magnets in the servo torque motor.

An aircraft, comprising:

• a fuselage and wings;
• at least one moveable control surface coupled to at least one of the fuselage and wings;
• a servo valve coupled to a piston which deflects the at least one moveable control surface;
• and
• a system to manage the output of the servo valve, comprising:
• a first plurality of feedback loops to receive a plurality of commands representative of a desired piston position and to generate, 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;
• a plurality of amplifiers to generate, from the plurality of difference signals, a corresponding plurality of magnetic flux target signals;
• a second plurality of feedback loops to receive, from the plurality of amplifiers, the plurality of magnetic flux target signals, wherein the magnetic flux target signals represent a desired magnetic flux measurement in the servo valve, and to generate, from the plurality of magnetic flux target signals, a plurality of magnetic flux difference signals which represent a difference between a desired magnetic flux and a current magnetic flux;
• and
• an assembly to regulate the servo valve using the magnetic flux difference signals, wherein the assembly to regulate the servo valve comprises:
• a plurality of current amplifiers and coils to generate a magnetic flux by inducing a level of coil current corresponding to the magnetic flux difference signal;
• a plurality of magnetic flux sensors to measure the total magnetic flux in a servo torque motor coupled to the servo valve;
• a plurality of conditioners to adjust the magnetic flux measurements by compensating for the magnetic flux contribution attributable to one or more permanent magnets in the servo torque motor.