Core

• US 7,106,163 B2
• Filed: 06/26/2002
• Issued: 09/12/2006
• Est. Priority Date: 03/27/1998
• Status: Expired due to Fees

• Current Assignee: Furukawa Electric Company Limited
• Original Assignee: Furukawa Electric Company Limited
• Inventors: Jin, Dongzhi, Abe, Fumihiko, Yonehara, Hideharu, Mochizuki, Hajime
• Primary Examiner(s): Nguyen, Tuyen T
• Application Number:
  US10/180,268
• Publication Number:
  US 20030020588A1
• Time in Patent Office: 1,539 Days
• Field of Search: 336/83, 336115-127, 336130-135, 336/233, 336/212, 336/234, 310/44, 252/62.54
• US Class Current: 336/233
• CPC Class Codes: H01F 1/26 by macromolecular organic substances
• CPC Class Codes: H01F 2019/085 Transformer for galvanic isolation
• 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

Abstract

An isolation transformer core having a coil and a core member made by injection molding a mixture containing 10 to 50±3 volume % of a soft magnetic material and the remainder being an insulating material having an electrical insulating property.

Claims

1. An isolation transformer comprising:

isolation transformer cores facing each other with a gap therebetween to form a magnetic circuit having an effective relative permeability almost exclusively depending on the gap, each of said cores including;

a coil, and

a core member accommodating the coil, the core member being as formed by injection molding, containing 10 to 50 volume % of a soft magnetic material powder and a remainder being an electrically insulating material, and having a relative permeability of 1.6 to 15.

2. The transformer according to claim 1, wherein the gap is in a range of mm order.

3. The transformer according to claim 2, wherein the gap is in a range of 1.0 mm±

0.5 mm.

4. The transformer core according to claim 3, wherein the soft magnetic material is soft magnetic ferrite or Sendust.

5. The transformer core according to claim 4, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.

6. The transformer core according to claim 5, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.

7. An automotive component, comprising:

core members facing each other with a gap therebetween to form a magnetic circuit having an effective relative permeability almost exclusively depending on the gap, each of the core members being as formed by injection molding, containing 10 to 50 volume % of a soft magnetic material powder and a remainder being an electrically insulating material, and having a relative permeability of 1.6 to 15.

8. The automotive component according to claim 7, wherein the gap is in a range of mm order.

9. The automotive component according to claim 8, wherein the gap is in a range of 1.0 mm±

0.5 mm.

10. The automotive component according to claim 9, wherein the soft magnetic material is soft magnetic ferrite or Sendust.

11. The automotive component according to claim 10, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.

12. The automotive component according to claim 9, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.

13. A rotation sensor tar detecting a relative rotation angle between first and second shafts, comprising:

a first rotor mounted to the first shaft and including a

first core member;

a stator fixed to a fixing member and including a stationary core, the stationary core facing the first core member with a gap therebetween to torm a magnetic circuit having an effective relative permeability almost exclusively depending on the gap together with the stationary core and including an excitation coil and a stationary core member accommodating the excitation coil;

a second rotor mounted to the second shaft; and

shield members provided to the first and second rotors, respectively, for changing the effective relative permeability when the relative rotation angle changes,

wherein each of the first and stationary core members is as formed by injection molding and contains 10 to 50 volume % of a soft magnetic material powder and a remainder being an electrically insulating material, the first and stationary core members each having relative permeability of 1.6 to 15.

14. The rotation sensor according to claim 13, wherein the gap is in a range of mm order.

15. An automotive component, comprising:

cores facing each other with a gap therebetween and forming a magnetic circuit having an effective relative permeability almost exclusively depending on the gap, each of said cores including;

a coil, and

a core member accommodating the coil, the core member being as formed by injection molding, containing 10 to 50 volume % of a soft magnetic material powder and a remainder being an electrically insulating material, and having a relative permeability of 1.6 to 15.

16. The automotive component according to claim 15, wherein the gap is in a range of mm order.

17. The automotive component according to claim 16, wherein the gap is in a range of 1.0 mm±

0.5 mm.

18. The automotive component according to claim 17, wherein the soft magnetic material is soft magnetic ferrite or Sendust.

19. The automotive component according to claim 18, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.

20. The automotive component according to claim 17, wherein the insulating material is any one of thermoplastic resin, thermoplastic rubber and thermosetting resin.