Electric power feeding device based on the electromagnetic induction

• US 5,506,560 A
• Filed: 05/15/1995
• Issued: 04/09/1996
• Est. Priority Date: 08/06/1992
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
• Original Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
• Inventors: Uematsu, Tatsuya, Ito, Makoto, Takeuchi, Kazuyoshi
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US08/440,882
• Time in Patent Office: 330 Days
• Field of Search: 336/83, 336/DIG. 2, 336/212, 336/233, 336/221, 336/216
• US Class Current: 336/83
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: Y10S 336/02 Separable

Abstract

A power feeding device of three-leg core type having a primary and secondary cores which appear to be a three-leg core cut into two pieces at the legs and form a magnetic circuit including gaps by being coupled to face the cut surfaces, and a primary and secondary windings wound coaxially around the central leg section, with the primary core and primary winding constituting the power supply part and the secondary core and secondary winding constituting the power receiving part. The power feeding device based on this winding structure achieves a far better power transfer efficiency as compared with the conventional counterpart having the primary and secondary windings wound separately on a pair of E-shape cores.

Claims

1. A power feeding device based on the electromagnetic induction comprising:

a first core having a cup structure with a first base portion, a sidewall portion extending perpendicularly from the periphery of the first base portion, and a radially inwardly directed lip portion extending from a free end of said sidewall portion and establishing between the first base, sidewall and lip portions a first continuous channel in which is disposed a first winding; and

a second core having a structure complementing said cup structure with a second base portion for covering an opening of said cup structure and an integral leg portion extending perpendicularly from said second base portion along a common central axis and terminating in a radially outwardly extending lip portion to form a second continuous channel about said leg portion and within which is disposed a second winding for disposition substantially concentrically within said first winding.

2. The power feeding device according to claim 1, wherein said first core and said first winding form a power receiving portion, and wherein said second core and said second winding form a power supply portion.

3. The power feeding device according to claim 1, wherein the radial width of said first winding is substantially equal to the depth of said first continuous channel.

4. The power feeding device according to claim 1, wherein the radial width of said second winding is substantially equal to the depth of said second continuous channel.

5. The power feeding device according to claim 1, wherein said first and said second continuous channels, when said first and second cores are assembled telescopingly, align to form an annular cavity having a height parallel to said central axis at least 1.5 times the radial width of said cavity.

6. A power feeding device based on electromagnetic induction comprising:

a first core having a cup structure with a first base portion, a sidewall portion extending perpendicularly from the periphery of the first base portion, and a radially inwardly directed lip portion extending from a free end of said sidewall portion and establishing between the first base, sidewall and lip portions a first continuous channel in which is disposed a first winding, said first core and said first winding forming a power receiving portion; and

a second core having a structure complementing said cup structure with a second base portion for covering an opening of said cup structure and an integral leg portion extending perpendicularly from said second base portion along a common central axis and terminating in a radially outwardly extending lip portion to form a second continuous channel about said leg portion and within which is disposed a second winding for disposition substantially concentrically within said first winding, said second core and said second winding forming a power supply portion,

said first and said second continuous channels, when said first and second cores are assembled telescopingly, align to form an annular cavity having a height parallel to said central axis at least 1.5 times the radial width of said cavity.

7. The power feeding device according to claim 6, wherein the radial width of said first winding is substantially equal to the depth of said first continuous channel.

8. The power feeding device according claim 6, wherein the radial width of said second winding is substantially equal to the depth of said second continuous channel.