Inductor devices – Coil or coil turn supports or spacers – Printed circuit-type coil
Patent
1998-09-11
2000-11-07
Donovan, Lincoln
Inductor devices
Coil or coil turn supports or spacers
Printed circuit-type coil
336225, 336232, 310208, 310254, H01F 500
Patent
active
06144281&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for generating an electric field and more particularly to such devices of small physical dimension producing a comparatively high-strength electric field.
2. Prior Art
In certain applications, physically small electrical devices are needed to produce a relatively strong electric field. Once such application is in navigation gyroscopes, particularly in a small navigation gyroscope referred to as a Dry Tuned-Rotor Gyroscope (DTG). On particular type of DTG is described in the paper entitled Two-Axis Dry Tuned-Rotor Gyroscopes: Design and Technology; William M. Mansour and Corrado Lacchini, The American Institute of Aeronautics and Astronautics, Inc., Volume 16, No. 3, May-June 1993. The DTG is a two-degree-of-freedom sensor of angular velocity about two mutually orthogonal axes. This class of instruments has been adopted for a number of control applications, most notably in the navigation of ships, aircrafts, and other vehicles. The basic structure of one prior art DTG is shown in FIG. 1. The unit 100 shown in FIG. 1 comprises a housing assembly having a base 101 and a cover 102. The base 101 supports a spin shaft 104 on a pair of ball bearings 106. Mounted on the base 101 is a stator 107 forming part of a hysteresis motor. A hysteresis ring 108 is supported on the spin shaft. Flexibly supported on the shaft 104 is a rotor 110. A pair of permanent magnets 112, 114, which are vertically separated by means of a spacer 115, are mounted on rotor 110. The rotor 110 is flexibly mounted on the spin shaft 104 and is movable with respect to the spin shaft 104 about axes in a horizontal plane extending perpendicular to the plane of the cross section shown in FIG. 1. Torquer coils 120, 121 are mounted on a beryllium ring 122 supported on the base 101 and surrounding the magnets 112, 114. A pair of pick-offs 126 is mounted on the base 101. The pick-offs are well-known sensors coils producing an electrical output signal which varies with a variation in the spacing between the pick-offs and the rotor 110. It will be apparent from FIG. 1 that an angular displacement of the rotor 110 about an axis perpendicular to the plane of the cross section of FIG. 1 will result in an increase in the spacing between one of the two pick-offs 126 and the rotor 110 and a decrease in spacing between the other of the two pick-offs 126 and rotor 110. Electrical signals produced by the pick-offs are indicative of the magnitude of the angular displacement and are employed to produce a current in the torquer coils 120, 121. The torquer coils produce a magnetic field in the rotor 110 imparting a torque to the rotor 110 tending to return the rotor to a position such that the distances between the two pick-offs 126 and the rotor 110 are again equal.
The permanent magnets 112, 114 are ring magnets extending circumferentially within the rotor 110. The unit 100 comprises four separate pick-offs coils and four separate torquer coils. One set of pick-offs and one set of torquer coils are disposed along a horizontally extending x axis and equidistant from a vertical axis and are referred to as the x pick-offs and the x torquer coils, respectively. Similarly, a set of pick-offs, referred to as y pick-offs, and a set of torquer coils, referred to as y torquer coils, are disposed along a horizontally extending y axis, extending perpendicularly to the x axis, and spaced equidistant from the vertical axis. It will be apparent that only one of the sets of pick-offs and torquer coils is shown in FIG. 1. The other pick-offs and torquer coils are disposed at 90.degree. angles from those shown in FIG. 1. In operation, signals from the x and y pick-offs are 0 in the absence of angular displacement of the rotor 110 relative to the spin shaft 104. When such a displacement occurs about the y axis, the gap between one of the x pick-offs and the rotor will increase and the gap between the other of the x pick-offs and the rotor will decrease. To cancel the difference between the gaps
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patent: 3587019 (1971-06-01), Bull et al.
patent: 4645961 (1987-02-01), Malasky
patent: 4883981 (1989-11-01), Gerfast
patent: 4962329 (1990-10-01), Fujita et al.
patent: 5276421 (1994-01-01), Boitard
patent: 5572179 (1996-11-01), Ito et al.
Donovan Lincoln
Nguyen Tuyen
Smiths Industries Aerospace & Defense Systems Inc.
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