Patents Assigned to BVR Aero Precision Corp
  • Patent number: 6326781
    Abstract: A system for sensing and indicating the angular position of a shaft through 360 degrees of rotation using a two-axis magnetoresistive microcircuit, a two pole magnet which rotates with the input shaft, a two channel operational amplifier, and an electromechanical device such as air core meter indicator, or an electronic computer to provide remote shaft angle indication. The magnetoresistive microcircuit consists of two Wheatstone bridges with magnetic field sensitive resistor elements. The two pole magnet is attached to the input shaft and configured to provide a uniform, low level magnetic field with maximum intensity less than that which will saturate the magnetoresistive sensors. Operational amplifier circuits are trimmed to eliminate sensor offset, match scale factors for the two channels, and amplify the differential bridge sensor signals. As the input shaft rotates, sinusoidal signals V1 and V2 are obtained from the amplifiers with equal amplitude and a 90-degree phase shift.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: December 4, 2001
    Assignee: BVR Aero Precision Corp
    Inventors: John Kunde, Gary Frederick