Inductive device having orthogonal windings

• US 4,210,859 A
• Filed: 04/18/1978
• Issued: 07/01/1980
• Est. Priority Date: 04/18/1978
• Status: Expired due to Term

• Current Assignee: Amiram Carmon, Paul L. Meretsky, TECHNION RESEARCH AND DEVELOPMENT FOUNDATION, LTD. (Technion-Israel Institute Of Technology)
• Original Assignee: Amiram Carmon, Paul L. Meretsky, TECHNION RESEARCH AND DEVELOPMENT FOUNDATION, LTD. (Technion-Israel Institute Of Technology)
• Inventors: Carmon, Amiram, Meretsky, Paul L.
• Primary Examiner(s): Shoop, William M.
• Application Number:
  US05/897,395
• Time in Patent Office: 805 Days
• Field of Search: 323/44 R, 323/48, 323/49, 323/50, 323/56, 323/60, 323/61, 336/83, 336/188, 336/214, 336/215, 336/221, 336/223, 336/234, 336/170, 336/173, 365/140, 365/143, 365/144, 365/145, 307/88
• US Class Current: 323/331
• CPC Class Codes: G11C 11/08 using multi-aperture storage elements, e.g. using transfluxors; using plates incorporating several individual multi-aperture storage elements G11C11/10 takes precedence
• CPC Class Codes: G11C 11/10 using multi-axial storage elements
• CPC Class Codes: H01F 29/14 with variable magnetic bias amplitude modulation by means of variable impedance element H03C1/08 ; magnetic amplifiers H03F; circuits for automatic telephonic communication H04M3/00
• CPC Class Codes: H01F 7/20 without armatures cores H01F3/00; coils H01F5/00 ; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381

Abstract

An inductive device comprising a magnetic core and windings for producing two or three substantially orthogonal magnetic fields at all points within the core. The device may be utilized as an inductor or transformer in a variety of applications.

Claims

1. An inductive device comprising in combination:

a magnetic core formed of ferromagnetic material;

inductive means for producing a first magnetic field in a closed path substantially throughout said core;

inductive means for producing a second magnetic field in a closed path substantially throughout said core;

wherein said first field is substantially orthogonal to said second field at all points within said core; and

means for controlling one of said magnetic fields to reduce the rate of fall-off of the inductance of the inductive means which produces the other orthogonal field while increasing the inductive coupling between the inductive means.

2. The device defined in claim 1, further comprising inductive means for producing a third magnetic field in a closed path substantially throughout said core, said third field being substantially orthogonal to said first and second fields at all points within said core.

3. The device defined in claim 1, wherein said means for controlling one of the magnetic fields includes means for flowing a DC current through one of said inductive means for reducing the rate of fall-off of the inductance of the inductive means which produces a magnetic field in the orthogonal direction.

4. The device defined in claim 1, wherein said inductive means include a winding having terminals connected to an input voltage and an orthogonally-related winding having output terminals, and in which the means for controlling one of said magnetic fields includes a winding orthogonal to the inductive means whose inductance is to be controlled and having terminals connected to a DC bias voltage.

5. The device defined in claim 1, wherein said core is a cylindrical pot core of hollow toroidal shape accommodating one inductive means in the hollow portion thereof and another inductive means around the outside of the toroid, said core being separable to provide access to the hollow interior.

6. The device defined in claim 1, wherein said core is a continuous hollow frame having a plurality of legs and in which one inductive means is a B type winding accommodated within the hollow frame and the other is an A type winding wound on the legs of the core.

7. The device defined in claim 1, wherein each of said inductive means includes a pair of windings and including means connecting a winding of one inductive means in series with a winding of the other inductive means.

8. The device defined in claim 7, wherein said controlling means includes means for flowing a D.C. current through said series connected orthogonal windings.

9. The device defined in claim 1 or 2, wherein the outer surface of said core is a spheroid.

10. The device defined in claim 9, wherein said outer surface is substantially spherical.

11. The device defined in claim 1 or 2, wherein the outer surface of said core is a rectangular parallelepiped.

12. The device defined in claim 11, wherein said outer surface is a cube.

13. The device defined in claim 1, wherein said means for producing said first and second fields include a first and second electrical winding, respectively.

14. The device defined in claim 2, wherein said means for producing said first, second and third fields include a first, second and third electrical winding, respectively.

15. The device defined in claim 13, wherein said core is formed of an "O"-shaped cross-section rotated through 360°

about an axis which is spaced from the outer edge of said cross-section, thereby enclosing a circuitous space and surrounding an opening extending along said axis;

wherein said first winding is a type B winding arranged within said circuitous space; and

wherein said second winding is a type A winding extending through said opening and around the outside surface of said core.

16. The device defined in claim 13 or 14, wherein said core is a solid having at least two holes passing through it in orthogonal directions;

wherein said first winding is a type A winding passing through at least one of said holes and around the outside surface of said core; and

wherein said second winding is a type A winding passing through at least one other of said holes and around the outside surface of said core.

17. The device defined in claim 14, wherein said core is a solid having three holes passing through it in orthogonal directions, and wherein said first, second and third windings are type A windings each extending, respectively, through at least one of said holes and around the outside surface of said core.

18. The device defined in claim 13 or 14, wherein said core is a rectangular parallelepiped comprising an inner core of rectangular parallelepiped shape having at least two grooves extending orthogonally around its outer surface and an outer shell enclosing and in contact with the surface of said inner core;

and wherein said first and second windings are each arranged, respectively, in one of said grooves.

19. The device defined in claim 14, wherein said core is a rectangular parallelepiped comprising an inner core of rectangular parallelepiped shape having three grooves extending orthogonally around its outer surface and an outer shell enclosing and in contact with the surface of said inner core;

and wherein said first, second and third windings are each arranged, respectively, in one of said grooves.

20. The device defined in claim 16, wherein each of said windings enter and exit the core through the same hole.

21. The device defined in claim 16, wherein each of said windings enter said core through one hole and exit from another.

22. The device defined in claim 1, wherein one of said first and second fields is maintained substantially constant while the other is varied.

23. The device defined in claim 2, wherein two of said first, second and third fields are maintained substantially constant while the other is varied.

24. The device defined in claim 13 or 14, wherein at least one of said windings includes a plurality of coils.

25. The device defined in claim 13 or 14, wherein each of said windings includes a plurality of coils.

26. The device defined in claim 24, wherein a DC current is applied to one of said coils in each of said windings, and wherein an AC voltage is applied across a coil of one of said windings and an AC voltage is taken from a coil of the other of said windings,

whereby said device comprises a variometer.

27. The device defined in claim 24, wherein at least two of said windings include a primary and a secondary coil,

whereby said device forms a plurality of independent transformers operating on the same core.

28. The device defined in claim 24, wherein first coils of at least two of said windings are connected in a primary circuit and second coils of at least two of said windings are connected in a secondary circuit;

and wherein an AC input voltage is applied across said primary circuit and an AC output voltage is taken from said secondary circuit,

whereby said device forms a single, high capacity transformer.

29. The device defined in claim 28, wherein the coils of said primary circuit are connected in series.

30. The device defined in claim 28, wherein the coils of said secondary circuit are connected in series.

31. The device defined in claim 28, wherein the coils of said primary circuit are connected in parallel.

32. The device defined in claim 28, wherein the coils of secondary circuit are connected in parallel.

33. The device defined in claim 13 or 14, further comprising capacitor means connected across one of said windings for tuning said one winding to a prescribed frequency F₀,

whereby said device with a tuned one winding may be operated to determine the value of Fourier coefficients for a periodic signal applied to another of said windings.

34. The device defined in claim 24, wherein a DC current is applied to one of said coils in at least one of said windings;

and wherein an input signal is applied across a coil of one of said windings and an output signal is taken from a coil of another of said windings,

whereby said device delays said output signal with respect to said input signal by a phase angle substantially proportional to said DC current.

35. The device defined in claim 34, wherein said DC current is applied to each of said windings.

36. The device defined in claim 1 or 2, wherein the flux density of each magnetic field is substantially constant throughout said core.

37. A method of increasing the energy stored in an inductive device having a magnetic core formed of ferromagnetic material, said method comprising the steps of:

producing a first magnetic field in said core of sufficient flux density to at least partially saturate said core in a first direction; and

producing a second magnetic field in said core of sufficient flux density to at least partially saturate said core in a second direction which is orthogonal to said first direction and wherein the flux density of each magnetic field is substantially constant throughout said core.

38. The method defined in claim 37, futher comprising the step of producing a third magnetic field in said core of sufficient flux density to at least partially saturate said core in a third direction which is orthogonal to said first and second directions.

39. An inductive device comprising in combination:

a magnetic core formed of ferromagnetic material;

a first electrical winding for producing a first magnetic field substantially throughout said core; and

a second electrical winding for producing a second magnetic field substantially throughout said core;

wherein said first field is substantially orthogonal to said second field at all points within said core, said core is a spheroid comprising an inner spheroidal core having at least two grooves extending orthogonally around its outer surface and an outer shell enclosing and in contact with the surface of said inner core and said first and second windings are each arranged, respectively, in one of said grooves.

40. An inductive device comprising in combination:

a magnetic core formed of ferromagnetic material;

a first electrical winding for producing a first magnetic field substantially throughout said core;

a second electrical winding for producing a second magnetic field substantially throughout said core;

wherein said first field is substantially orthogonal to said second field at all points within said core;

a third electrical winding for producing a third magnetic field substantially throughout said core;

wherein said third field is substantially orthogonal to said first and second fields at all points within said core, said core is a spheroid comprising an inner spheroidal core having three grooves extending orthogonally around its outer surface and an outer shell enclosing and in contact with the surface of said inner core and said first, second and third windings are each arranged, respectively, in one of said grooves.

41. A method of increasing the energy stored in an inductive device having a magnetic core formed of ferromagnetic material comprising the steps of

producing a first magnetic field in a closed path substantially coextensive with said core by an inductive means,

producing a second magnetic field in a closed path substantially coextensive with said core by an inductive means, wherein said first field is substantially orthogonal to said second field at all points within the core, and

controlling one of said magnetic fields to reduce the rate of fall-off of inductance of the inductive means which produce the other orthogonal field while increasing the inductive coupling between the inductive means.

42. A method as set forth in claim 41, in which the magnetic field is controlled by flowing a DC current through the inductive means which produces the field orthogonal to the field produced by the inductive means whose inductance is to be controlled.

43. A method as set forth in claim 41, including producing a third magnetic field in a closed path substantially coextensive with said core by an inductive means and controlling at least two of said magnetic fields to reduce the rate of fall-off of inductance of the inductive means which produces the other orthogonal field.

44. An inductive device comprising

a pair of orthogonally related windings having substantially no magnetic coupling therebetween,

a magnetic core having at least two closed orthogonally-related magnetic paths, each lying in the field of one of said windings,

means for impressing an AC voltage across one of said windings for generating an output voltage in the other winding, and

means for controlling the magnetic field associated with the other winding to reduce the rate of fall-off of inductance of the winding on which the AC voltage is impressed and control the voltage across the output winding.

45. An inductive device as set forth in claim 44 including means for controlling the magnetic field associated with the winding on which the AC voltage is impressed for further controlling the voltage across the output winding.

46. An inductive device as set forth in claim 44 including a third winding orthogonally related to the other two windings, said magnetic core having a third closed magnetic path orthogonally related to the other two magnetic paths, and in which there are means for controlling the magnetic fields of at least two of the windings to control the output of the third.

47. An inductive device as set forth in claim 44 including a pair of windings magnetically associated with each closed path and means connecting a winding of each pair in series.

48. An inductive device as set forth in claim 47 in which the controlling means is in the series connected windings.

49. A method of controlling an output voltage in an inductive device embodying a magnetic core having at least two closed orthogonally related magnetic paths, each lying in the field of one of a pair of orthogonally related windings, comprising the steps of

impressing an AC voltage across one of the windings which is not normally inductively coupled with the other output winding and

controlling the magnetic field associated with the output winding to reduce the rate of fall-off of inductance of the winding on which the AC voltage is impressed and increasing the magnetic coupling between the windings to control the voltage across the output winding.

50. A method as set forth in claim 49 including controlling the magnetic field associated with the input winding for further controlling the voltage across the output windings.

51. A method as set forth in claim 49 including an inductive device including a third winding orthogonally related to the other two windings, said magnetic core having a third closed magnetic path orthogonally related to the other two magnetic paths, including controlling the magnetic fields of at least two of the windings to control the output of the third.