Resonator restrained gyro

• US 4,386,535 A
• Filed: 09/12/1980
• Issued: 06/07/1983
• Est. Priority Date: 09/12/1980
• Status: Expired due to Term

• Current Assignee: Kearfott Guidance and Navigation Corporation
• Original Assignee: Singer PLC (Hayleys Plc)
• Inventors: Albert, William C.
• Primary Examiner(s): Bonck, Rodney H.
• Application Number:
  US06/187,010
• Time in Patent Office: 998 Days
• Field of Search: 74/5 F, 74/5.6 D, 74/5.6 A, 74/5.6 R, 73/504, 73/505, 73/DIG. 4
• US Class Current: 74/5.60D
• CPC Class Codes: G01C 19/28 Pick-offs, i.e. devices for taking-off an indication of the displacement of the rotor axis
• CPC Class Codes: Y10T 74/1264 Optical
• CPC Class Codes: Y10T 74/1275 Electrical
• CPC Class Codes: Y10T 74/1293 Flexure hinges for gyros

Abstract

A gyro includes a rotatable hub with a flexing member centrally supporting a rotor. The rotor is further supported by a pair of piezoelectric force transducers angularly separated by 90 degrees. The rotor turns with the hub. Oscillators drive the transducers and, as the gyro undergoes angular displacement, the oscillators "follow" the instant natural frequency of the transducers. FM signals are generated which may be resolved into two digital signals indicative of angular rate about the gyro case X and Y axes.

Claims

1. A gyroscope comprising:

a first member rotating about a spin axis;

a second member rotating about the spin axis and positioned in spaced relation to the first member;

flexible means securing the first and second rotating members together for permitting linked rotation therebetween;

a plurality of oscillating means;

a plurality of force sensing means respectively connected in circuit with the oscillating means, the force sensing means being physically angularly spaced from each other and connected between the first and second rotating members for producing a digital signal having a vibrational frequency dependent upon axial force along the spin axis as modulated by an input angular rate; and

means connected in circuit with the oscillating means and the force sensing means for resolving the frequency modulated signal into components indicative of input rates about two orthogonal axes.

2. The subject matter set forth in claim 1 together with means for detecting angular rotation of the second rotating member between quadrature reference points.

3. The subject matter set forth in claim 1 wherein the first rotating member is a hub driven by a motor and further wherein the second rotating member is a gyroscope rotor positioned in planar spaced relation to the first rotating member and further wherein the force sensing means are transducers fabricated from crystal material.

4. The subject matter set forth in claim 1 wherein the plurality of force sensing means comprises a pair of crystal transducers disposed 90 degrees apart from each other.