Electrostatically controlled micromechanical gyroscope

• US 5,353,656 A
• Filed: 08/18/1992
• Issued: 10/11/1994
• Est. Priority Date: 08/18/1992
• Status: Expired due to Term

• Current Assignee: Perfect Galaxy International Limited
• Original Assignee: Satcon Technology Corporation
• Inventors: Hawkey, Timothy, Torti, Richard, Johnson, Bruce
• Primary Examiner(s): Bonck, Rodney H.
• Application Number:
  US07/931,836
• Time in Patent Office: 784 Days
• Field of Search: 74/5.6 D, 74/5.7, 74/5.41, 73/505, 310/309
• US Class Current: 74/5.41
• CPC Class Codes: G01C 19/24 using magnetic or electrostatic fields
• CPC Class Codes: Y10T 74/1232 Erecting
• CPC Class Codes: Y10T 74/1275 Electrical
• CPC Class Codes: Y10T 74/1282 with rotor drive

Abstract

An integrated electrostatically-controlled micromechanical gyroscope with a rotor encompassed within a rotor cavity and electrostatically spun within the cavity. The gyroscope includes a plurality of axial electrostatic rotor actuators above and below the rotor for controlling the axial and tilt position of the rotor within the cavity, and a plurality of radial electrostatic actuators spaced circumferentially around the rotor for controlling the radial and tilt position of the rotor within the cavity. The position of the rotor within the cavity is then resolved to determine the external forces acting on the rotor.

Claims

1. An electrostatically-controlled micromechanical gyroscope, comprising:

a disc-shaped rotor;

a rotor cavity encompassing said rotor;

means for electrostatically spinning said rotor within said rotor cavity;

a plurality of axial electrostatic rotor actuators above and below said rotor for providing exclusive control of the axial and tilt position of said rotor within said rotor cavity;

a plurality of radial electrostatic actuators spaced circumferentially around said rotor for providing exclusive control of the radial and tilt position of said rotor within said rotor cavity; and

means for resolving the position of said rotor within said cavity to determine the external forces acting on said rotor.

2. The electrostatically controlled micromechanical gyroscope of claim 1 in which said means for electrostatically spinning said rotor includes an electrostatic motor.

3. The electrostatically controlled micromechanical gyroscope of claim 2 in which said motor is synchronous.

4. The electrostatically controlled micromechanical gyroscope of claim 2 in which said motor includes a motor rotor member in said rotor.

5. The electrostatically controlled micromechanical gyroscope of claim 4 in which said motor further includes a motor stator member surrounding said rotor member around the periphery of said cavity.

6. The electrostatically controlled micromechanical gyroscope of claim 1 in which said plurality of axial electrostatic rotor actuators includes four actuators below said rotor and four actuators above said rotor.

7. The electrostatically controlled micromechanical gyroscope of claim 1 in which said plurality of radial electrostatic actuators includes a plurality of actuators spaced around the periphery of said cavity at two axially-spaced locations.

8. The electrostatically controlled micromechanical gyroscope of claim 7 in which there are four spaced radial actuators at each of said two axially-spaced locations.

9. The electrostatically controlled micromechanical gyroscope of claim 1 in which said means for resolving the position of said rotor within said cavity is responsive to said axial and said radial actuators.

10. The electrostatically controlled micromechanical gyroscope of claim 1 in which said means for resolving the position of said rotor within said cavity includes means for determining said rotor position in six degrees of freedom relative to said rotor cavity.

11. The electrostatically controlled micromechanical gyroscope of claim 1 further including means for controlling the position of said rotor within said cavity.

12. The electrostatically controlled micromechanical gyroscope of claim 11 in which said means for controlling the position of said rotor within said cavity is responsive to said axial and said radial actuators.

13. The electrostatically controlled micromechanical gyroscope of claim 12 in which said means for controlling the position of said rotor within said cavity includes means for selectively applying electrostatic rotor positioning signals to said axial and said radial actuators.

14. The electrostatically controlled micromechanical gyroscope of claim 1 in which said means for controlling the position of said rotor within said cavity includes means for altering in six degrees of freedom said rotor in relation to said cavity.

15. The electrostatically controlled micromechanical gyroscope of claim 1 in which said means for resolving the position of said rotor within said cavity includes a plurality of capacitive sensor means spaced around said rotor cavity.

16. The electrostatically controlled micromechanical gyroscope of claim 1 in which said gyroscope is integrated.

17. An integrated, electrostatically-controlled micromechanical gyroscope, comprising:

an integrated mechanical gyroscope system including;

a disc-shaped rotor;

a rotor cavity encompassing said rotor;

means for electrostatically spinning said rotor within said rotor cavity;

a plurality of electrostatic rotor-positioning actuators spaced around the inside of said cavity for providing exclusive control of the position of said rotor within said cavity; and

means for resolving the position of said rotor within said cavity to determine the external forces acting on said rotor.

18. The integrated electrostatically controlled micromechanical gyroscope of claim 17 in which said means for resolving the position of said rotor within said cavity includes a plurality of capacitive position sensors in said integrated mechanical gyroscope system.

19. The integrated, electrostatically controlled micromechanical gyroscope of claim 18 in which at least one of said capacitive position sensors includes a said electrostatic rotor-positioning actuator.