Piezoelectric sensor assembly, and sensor attachment assembly and electrical system employing same

• US 9,933,285 B2
• Filed: 08/12/2014
• Issued: 04/03/2018
• Est. Priority Date: 03/21/2014
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Inventors: Gass, Dale Louis, Stringer, Jeffrey Thomas
• Primary Examiner(s): West, Paul
• Assistant Examiner(s): ZHONG, XIN Y
• Application Number:
  US14/457,625
• Publication Number:
  US 20150268071A1
• Time in Patent Office: 1,330 Days
• CPC Class Codes: G01D 11/245 Housings for sensors
• CPC Class Codes: G01D 11/30 Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
• CPC Class Codes: G01D 5/185 using piezoelectric sensors

Abstract

A piezoelectric sensor assembly is for an electrical system. The electrical system includes a sensor attachment assembly and a number of electrical conductors. The sensor attachment assembly includes a sensor housing and a fastening member for fastening the sensor housing to a corresponding one of the electrical conductors. The piezoelectric sensor assembly includes a processor enclosed by the sensor housing, a piezoelectric sensor element, a wiring assembly electrically connecting the piezoelectric sensor element to the processor, an insulating member coupled to the piezoelectric sensor element and being structured to extend outwardly from the sensor housing to engage the corresponding one of the electrical conductors, and a mounting enclosure structured to mount the piezoelectric sensor element and the insulating member to the sensor housing.

Claims

1. A piezoelectric sensor assembly for an electrical system, said electrical system comprising a sensor attachment assembly and a number of electrical conductors, said sensor attachment assembly comprising a sensor housing and a fastening member for fastening the sensor housing to a corresponding one of said electrical conductors, said corresponding one of said electrical conductors having a first side and a second side disposed opposite the first side, said piezoelectric sensor assembly comprising:

a processor structured to be enclosed by the sensor housing;

a piezoelectric sensor element;

a wiring assembly electrically connecting said piezoelectric sensor element to said processor;

an insulating member coupled to said piezoelectric sensor element and being structured to extend outwardly from the sensor housing to engage the first side of said corresponding one of said electrical conductors, wherein said insulating member is a ceramic disc;

wherein said ceramic disc includes a first side and a second side disposed opposite the first side;

wherein the first side of said ceramic disc is structured to engage the first side of said corresponding one of said electrical conductors; and

wherein the second side of said ceramic disc includes a recess structured to receive said piezoelectric sensor element; and

a mounting enclosure structured to mount said piezoelectric sensor element and said insulating member to the sensor housing,

wherein said fastening member comprises an elongated strap disposed on the exterior of the sensor housing and structured to wrap around and engage the second side of said corresponding one of said electrical conductors and attach to the sensor housing, in order to secure said piezoelectric sensor assembly to the first side of said corresponding one of said electrical conductors without requiring a separate mounting or clamping member on the second side.

2. The piezoelectric sensor assembly of claim 1 wherein said piezoelectric sensor element is adhered to the second side of said ceramic disc with a conductive adhesive.

3. The piezoelectric sensor assembly of claim 1 wherein said piezoelectric sensor element comprises a first electrode and a second electrode;

wherein said wiring assembly includes a first wire, a second wire and an electrical connector;

wherein said first wire and said second wire each include a first end and a second end;

wherein the first end of said first wire is electrically connected to said first electrode;

wherein the first end of said second wire is electrically connected to said second electrode; and

wherein the second end of said first wire and the second end of said second wire are both electrically connected to said electrical connector.

4. The piezoelectric sensor assembly of claim 3 wherein said piezoelectric sensor element is a cylindrical disc;

wherein said cylindrical disc further comprises a first end, a second end disposed opposite the first end of said cylindrical disc, and a sidewall extending therebetween;

wherein said first electrode is disposed on the sidewall proximate to the first end of said cylindrical disc; and

wherein said second electrode is disposed on the second end of said cylindrical disc.

5. The piezoelectric sensor assembly of claim 3 wherein said processor is a printed circuit board;

and wherein said electrical connector electrically connects said piezoelectric sensor element to said printed circuit board.

6. The piezoelectric sensor assembly of claim 1 wherein said mounting enclosure is a shielding member comprising a cylindrical body, a thru hole extending through said cylindrical body, and a flange extending radially outwardly from said cylindrical body;

wherein said cylindrical body encloses and shields said piezoelectric sensor element;

wherein said wiring assembly extends through said thru hole; and

wherein said flange is structured to cooperate with a corresponding portion of the sensor housing.

7. The piezoelectric sensor assembly of claim 6 wherein said shielding member further comprises a curved spring or wave spring washer;

and wherein said curved spring or wave spring washer is structured to extend around said cylindrical body between said flange and said corresponding portion of the sensor housing.

8. A sensor attachment assembly for an electrical system including a number of electrical conductors, said sensor attachment assembly comprising:

a sensor housing;

a fastening member structured to fasten the sensor housing to a corresponding one of said electrical conductors, said corresponding one of said electrical conductors including a first side and a second side disposed opposite the first side; and

a piezoelectric sensor assembly comprising;

a processor enclosed by the sensor housing,

a piezoelectric sensor element,

a wiring assembly electrically connecting said piezoelectric sensor element to said processor,

an insulating member coupled to said piezoelectric sensor element and extending outwardly from the sensor housing to engage the first side of said corresponding one of said electrical conductors, wherein said insulating member is a ceramic disc;

wherein said ceramic disc includes a first side and a second side disposed opposite the first side;

wherein the first side of said ceramic disc is structured to engage the first side of said corresponding one of said electrical conductors; and

wherein the second side of said ceramic disc includes a recess structured to receive said piezoelectric sensor element, and

a mounting enclosure mounting said piezoelectric sensor element and said insulating member to the sensor housing,

wherein said fastening member comprises an elongated strap disposed on the exterior of the sensor housing and structured to wrap around and engage the second side of said corresponding one of said electrical conductors and attach to the sensor housing, in order to secure said piezoelectric sensor assembly to the first side of said corresponding one of said electrical conductors without requiring a separate mounting or clamping member on the second side.

9. The sensor attachment assembly of claim 8 wherein said piezoelectric sensor element comprises a first electrode and a second electrode;

wherein said wiring assembly includes a first wire, a second wire and an electrical connector;

wherein said first wire and said second wire each include a first end and a second end;

wherein the first end of said first wire is electrically connected to said first electrode;

wherein the first end of said second wire is electrically connected to said second electrode; and

wherein the second end of said first wire and the second end of said second wire are both electrically connected to said electrical connector.

10. The sensor attachment assembly of claim 9 wherein said piezoelectric sensor element is a cylindrical disc;

wherein said cylindrical disc further comprises a first end, a second end disposed opposite the first end of said cylindrical disc, and a sidewall extending therebetween;

wherein said first electrode is disposed on the sidewall proximate to the first end of said cylindrical disc; and

wherein said second electrode is disposed on the second end of said cylindrical disc.

11. The sensor attachment assembly of claim 9 wherein said processor is a printed circuit board;

and wherein said electrical connector electrically connects said piezoelectric sensor element to said printed circuit board.

12. The sensor attachment assembly of claim 8 wherein said mounting enclosure is a shielding member comprising a cylindrical body, a thru hole extending through said cylindrical body, and a flange extending radially outwardly from said cylindrical body;

wherein said cylindrical body encloses and shields said piezoelectric sensor element;

wherein said wiring assembly extends through said thru hole; and

wherein said flange cooperates with a corresponding portion of the sensor housing.

13. The sensor attachment assembly of claim 12 wherein said shielding member further comprises a curved spring or wave spring washer;

and wherein said curved spring or wave spring washer extends around said cylindrical body between said flange and said corresponding portion of the sensor housing.

14. An electrical system comprising:

a number of electrical conductors; and

a sensor attachment assembly comprising;

a sensor housing,

a fastening member for fastening the sensor housing to a corresponding one of said electrical conductors, said corresponding one of said electrical conductors including a first side and a second side disposed opposite the first side, and

a piezoelectric sensor assembly comprising;

a processor enclosed by the sensor housing,

a piezoelectric sensor element,

a wiring assembly electrically connecting said piezoelectric sensor element to said processor,

an insulating member coupled to said piezoelectric sensor element and extending outwardly from the sensor housing to engage the first side of said corresponding one of said electrical conductors, wherein said insulating member is a ceramic disc;

wherein said ceramic disc includes a first side and a second side disposed opposite the first side;

wherein the first side of said ceramic disc is structured to engage the first side of said corresponding one of said electrical conductors; and

wherein the second side of said ceramic disc includes a recess structured to receive said piezoelectric sensor element, and

a mounting enclosure mounting said piezoelectric sensor element and said insulating member to the sensor housing,

wherein said fastening member comprises an elongated strap disposed on the exterior of the sensor housing and structured to wrap around and engage the second side of said corresponding one of said electrical conductors and attach to the sensor housing, in order to secure said piezoelectric sensor assembly to the first side of said corresponding one of said electrical conductors without requiring a separate mounting or clamping member on the second side.

15. The electrical system of claim 14 wherein said piezoelectric sensor element comprises a first electrode and a second electrode;

wherein said wiring assembly includes a first wire, a second wire and an electrical connector;

wherein said first wire and said second wire each include a first end and a second end;

wherein the first end of said first wire is electrically connected to said first electrode;

wherein the first end of said second wire is electrically connected to said second electrode; and

wherein the second end of said first wire and the second end of said second wire are both electrically connected to said electrical connector.

16. The electrical system of claim 15 wherein said piezoelectric sensor element is a cylindrical disc;

wherein said cylindrical disc further comprises a first end, a second end disposed opposite the first end of said cylindrical disc, and a sidewall extending therebetween;

wherein said first electrode is disposed on the sidewall proximate to the first end of said cylindrical disc;

wherein said second electrode is disposed on the second end of said cylindrical disc;

wherein said processor is a printed circuit board; and

wherein said electrical connector electrically connects said piezoelectric sensor element to said printed circuit board.

17. The electrical system of claim 14 wherein said mounting enclosure is a shielding member comprising a cylindrical body, a thru hole extending through said cylindrical body, a flange extending radially outwardly from said cylindrical body, and a curved spring or wave spring washer;

wherein said cylindrical body encloses and shields said piezoelectric sensor element;

wherein said wiring assembly extends through said thru hole;

wherein said flange cooperates with a corresponding portion of the sensor housing; and

wherein said curved spring or wave spring washer extends around said cylindrical body between said flange and said corresponding portion of the sensor housing.