NASA Technical Reports Server (NTRS) : Shaft pdf

NASA Technical Reports Server (NTRS) : Shaft

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A proposed brushless shaft-angle sensor for use in extreme cold would offer significant advantages over prior such sensors: (1) It would be capable of operating in extreme cold; and (2) Its electronic circuitry would be simpler than that of a permanent-magnet/ multiple-Hall-probe shaft-angle sensor that would otherwise ordinarily be used to obtain comparable angular resolution. The principle of operation of the proposed shaft-angle sensor requires that the shaft (or at least the portion of the shaft at the sensor location) be electrically insulating. The affected portion of the shaft would be coated with metal around half of its circumference. Two half-circular-cylinder electrodes having a radius slightly larger than that of the shaft would be mounted on the stator, concentric with the shaft, so that there would be a small radial gap between them and the outer surface of the shaft. Hence, there would be a capacitance between each stationary electrode and the metal coat on the shaft

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 7/1/2008
• Year: 2008
• Book Topics/Themes: NASA Technical Reports Server (NTRS), OSCILLATORS, SHAFTS (MACHINE ELEMENTS), TUNNEL DIODES, ANGLES (GEOMETRY), SUBZERO TEMPERATURE, ANGULAR RESOLUTION, CAPACITANCE, CIRCULAR CYLINDERS, ELECTRODES, Chui, Talso

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