Wireless energy transfer with multi resonator arrays for vehicle applications

• US 8,922,066 B2
• Filed: 10/17/2011
• Issued: 12/30/2014
• Est. Priority Date: 09/27/2008
• Status: Active Grant

Abstract

A vehicle powering wireless receiver for use with a first electromagnetic resonator coupled to a power supply. The wireless receiver includes a load configured to power the drive system of a vehicle using electrical power, and a second electromagnetic resonator adapted to be housed upon the vehicle and configured to be coupled to the load, at least one other electromagnetic resonator configured with the first electromagnetic resonator and the second electromagnetic resonator in an array of electromagnetic resonators to distribute power over an area, wherein the second electromagnetic resonator is configured to be wirelessly coupled to the array to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator.

Claims

1. A vehicle powering wireless power receiver, comprising:

an array of electromagnetic resonators configured for attachment to the vehicle, wherein each resonator in the array comprises a magnetic material and a coil comprising a plurality of loops of conducting material encircling the magnetic material; and

a load coupled to the array and to a drive system of the vehicle,

wherein each resonator in the array is oriented so that electrical current circulating within the resonator'"'"'s coil generates a magnetic dipole moment that falls within a plane defined by the resonator'"'"'s magnetic material; and

wherein the array is configured to receive power from a resonant, non-radiative wireless power source and to deliver power to the load.

2. The wireless power receiver of claim 1, wherein the array is configured to be disposed on an under-carriage of the vehicle.

3. The wireless power receiver of claim 1, wherein the vehicle is an electric vehicle.

4. The wireless power receiver of claim 1, wherein the vehicle is a hybrid vehicle.

5. The wireless power receiver of claim 1, wherein each of the resonators in the array is individually controllable relative to the other resonators and can be activated or de-activated to regulate power transfer between the power source and the power receiver.

6. The wireless power receiver of claim 1, wherein at least a portion of the array is moveable relative to the power source while power is transferred from the power source to the power receiver.

13. The wireless power receiver of claim 1, wherein at least some of the resonators in the array are aligned so that their magnetic materials define a common plane.

14. The wireless power receiver of claim 13, wherein each of the at least some of the resonators is spaced from the other ones of the at least some of the resonators in the common plane.

15. The wireless power receiver of claim 14, wherein each of the at least some of the resonators is spaced from the other ones of the at least some of the resonators in the common plane by an air gap.

16. The wireless power receiver of claim 15, wherein each air gap has a width of 0.2 cm or more.

17. The wireless power receiver of claim 15, wherein each air gap has a width of 2 cm or less.

18. The wireless power receiver of claim 1, wherein:

a first plurality of one or more of the resonators in the array are aligned so that their magnetic materials define a first common plane; and

a second plurality of one or more of the resonators in the array are aligned so that their magnetic materials define a second common plane spaced from the first common plane in a direction normal to the first common plane.

19. The wireless power receiver of claim 18, wherein the first and second common planes are parallel.

20. The wireless power receiver of claim 18, wherein the array is a three-dimensional array comprising rows of resonators extending in three orthogonal directions.

21. The wireless power receiver of claim 1, wherein the array comprises two resonators.

22. The wireless power receiver of claim 1, wherein the array comprises four resonators positioned in a 2×

2 array.

23. The wireless power receiver of claim 1, wherein the array comprises eight resonators positioned in a 2×

2×

2 array.

24. The wireless power receiver of claim 1, wherein at least some adjacent resonators in the array have a common helical direction defined by their respective coils, and wherein the respective coils of the at least some adjacent resonators in the array are offset from one another in the common helical direction.

25. The wireless power receiver of claim 24, wherein the respective coils of the at least some adjacent resonators in the array are interleaved in the common helical direction.

7. A vehicle wireless power system, comprising:

a wireless power source comprising at least one electromagnetic resonator and a power supply coupled to the at least one electromagnetic resonator, wherein the wireless power source is configured to be positioned in proximity to the vehicle; and

a wireless power receiver comprising an array of electromagnetic resonators configured for attachment to the vehicle, wherein each resonator in the array comprises a magnetic material and a coil comprising a plurality of loops of conducting material encircling the magnetic material,

wherein each resonator in the array is oriented so that electrical current circulating within the resonator'"'"'s coil generates a magnetic dipole moment that falls within a plane defined by the resonator'"'"'s magnetic material; and

wherein the power receiver is configured to couple to the power source to provide resonant, non-radiative wireless power transfer from the power source to the power receiver.

8. The wireless power system of claim 7, wherein the power receiver is configured to be disposed on an under-carriage of the vehicle.

9. The wireless power system of claim 7, wherein the vehicle is an electric vehicle.

10. The wireless power system of claim 7, wherein the vehicle is a hybrid vehicle.

11. The wireless power system of claim 7, wherein each of the resonators in the array is individually controllable relative to the other resonators and can be activated or de-activated to regulate power transfer between the power source and the power receiver.

12. The wireless power system of claim 7, wherein at least a portion of the array is moveable relative to the power source while power is transferred from the power source to the power receiver.

26. The wireless power system of claim 7, wherein the wireless power source comprises an array of electromagnetic resonators.

27. The wireless power system of claim 26, wherein each of the resonators in the wireless power source can be activated or de-activated to regulate power transfer between the power source and the power receiver.

28. The wireless power system of claim 26, wherein each of the resonators in the wireless power source is oriented so that electrical current circulating within the resonator'"'"'s coil generates a magnetic dipole moment that falls within a plane defined by the resonator'"'"'s magnetic material.

29. The wireless power system of claim 26, wherein the wireless power source comprises a three-dimensional array of rows of resonators extending in three orthogonal directions.

30. The wireless power system of claim 7, wherein at least some of the resonators in the power receiver array are aligned so that their magnetic materials define a common plane.

31. The wireless power system of claim 30, wherein each of the at least some of the resonators is spaced from the other ones of the at least some of the resonators in the common plane.

32. The wireless power system of claim 31, wherein each of the at least some of the resonators is spaced from the other ones of the at least some of the resonators in the common plane by an air gap.

33. The wireless power system of claim 32, wherein each air gap has a width of 0.2 cm or more.

34. The wireless power system of claim 32, wherein each air gap has a width of 2 cm or less.

35. The wireless power system of claim 7, wherein:

a first plurality of one or more of the resonators in the power receiver array are aligned so that their magnetic materials define a first common plane; and

a second plurality of one or more of the resonators in the power receiver array are aligned so that their magnetic materials define a second common plane spaced from the first common plane in a direction normal to the first common plane.

36. The wireless power system of claim 35, wherein the first and second common planes are parallel.

37. The wireless power system of claim 35, wherein the power receiver array is a three-dimensional array comprising rows of resonators extending in three orthogonal directions.

38. The wireless power system of claim 7, wherein the power receiver array comprises eight resonators positioned in a 2×

2×

2 array.

39. The wireless power system of claim 7, wherein at least some adjacent resonators in the power receiver array have a common helical direction defined by their respective coils, and wherein the respective coils of the at least some adjacent resonators in the array are offset from one another in the common helical direction.

40. The wireless power system of claim 39, wherein the respective coils of the at least some adjacent resonators in the power receiver array are interleaved in the common helical direction.