Inductive coupler

• US 4,303,902 A
• Filed: 08/31/1979
• Issued: 12/01/1981
• Est. Priority Date: 08/31/1979
• Status: Expired due to Term

• Current Assignee: Cooper Cameron Corporation (Schlumberger NV)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Opdahl, Everett W., Lesster, Laban E.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US06/071,633
• Time in Patent Office: 823 Days
• Field of Search: 336/DIG. 2, 336/234, 336/120, 336/83, 336/212, 336/90, 336/92
• US Class Current: 336/83
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 38/18 Rotary transformers
• CPC Class Codes: Y10S 336/02 Separable

Abstract

A coaxial inductive coupler having an inner magnetic core member and a surrounding outer magnetic core member each having respective windings. The inner magnetic core is operatively carried by an inner support assembly which is additionally connected to an outer protective shell. The outer core is disposed within a cylinder having at the end thereof a large guide member for facilitating insertion into the outer protective shell. A locking mechanism is provided to insure positive coupling and easy release.

Claims

1. Inductive coupler apparatus comprising:

(A) a first support assembly including an elongated rod portion having a free end;

(B) a first magnetic flux supporting elongated core member extending around and carried by said rod portion, and including first and second end portions and a central portion joining said end portions;

(C) retaining means coupled to said free end of said rod portion to maintain said first core member in position;

(D) a first winding positioned around said central portion;

(E) a second and generally hollow cylindrical support assembly;

(F) a second magnetic flux supporting core member positioned around the inner surface of said second support assembly, and being of a generally hollow cylindrical shape and including first and second end portions and a central portion joining said end portions;

(G) means coupled to said generally hollow cylindrical support assembly to maintain said second core member in position;

(H) a second winding positioned around the inner surface of said central portion;

(I) said first core member being matable within said second core member such that said first and second end portions of said first core member are in magnetic flux registration with respective end portions of said second core member;

(J) an outer cylindrical protective shell surrounding both said first and second core members when in a mated condition; and

(K) said protective shell being carried by said first support assembly and being of a length to extend past said free end of said rod portion.

2. Apparatus according to claim 1 wherein:

(A) said means coupled to said generally hollow cylindrical support assembly is a guide member connected to an end thereof and having a generally tapered and rounded end portion to facilitate insertion into said protective shell.

3. Apparatus according to claim 1 wherein:

(A) said first core member is comprised of a plurality of pieces of flux supporting material.

4. Apparatus according to claim 3 wherein:

(A) each of said first and second end portions and said central portion of said first core member are of individual pieces of said material.

5. Apparatus according to claim 4 wherein:

(A) said portions are in the form of annular discs the outer diameter of said end portions being greater than that of said central portion.

6. Apparatus according to claim 1 wherein:

(A) said generally hollow cylindrical support assembly includes a groove in the internal surface thereof for receiving said second core member and extending for an axial length at least equal to the axial length of said second core member for limiting the degree of insertion of said second core member.

7. Apparatus according to claim 2 wherein:

(A) said guide member being coupled to said second core member and including means to limit the movement thereof relative to said generally hollow cylindrical support assembly.

8. Apparatus according to claim 1 which includes:

(A) means for locking said coupler when in a mated condition;

(B) an axially movable release mechanism coupled to said means for locking to unlock said coupler;

(C) said release mechanism being constructed and arranged to effect said unlocking when pulled in an axial direction.

9. Apparatus according to claim 1 which includes:

(A) means for wiping the inner surface of said outer protective shell each time said coupler is mated and unmated.

10. Apparatus according to claim 1 which includes:

(A) means for wiping the surfaces of said first and second core members which are in magnetic flux registration, each time said coupler is mated and unmated.