Focusing device for low frequency operation
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsDebasish Banerjee, Hideo Iizuka, Jaewook Lee, Ercan Mehmet Dede
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Abstract
An example apparatus for obtaining a desired magnetic field distribution from an incident magnetic field, such as a kHz magnetic field, comprises a structure receiving the incident magnetic field and generating the desired magnetic field distribution at a predetermined distance from the transmitting side of the apparatus. The desired magnetic field distribution results from a spatial distribution of induced electrical current over the structure. Examples of the invention also include design methods and methods of using the apparatus.
Claims21
A method of modifying an incident magnetic field to obtain a magnetic field distribution and improving a magnetic and/or electromagnetic device such as an actuator, motor, invertor, switched reluctance motors and the like, the method comprising:
- providing a focusing device having a first side and a second side;
- directing the incident magnetic field towards the first side,
- the incident magnetic field generating an induced electrical current profile within the focusing device;
- and
- obtaining a transmitted magnetic field from the second side, the transmitted magnetic field providing the magnetic field distribution,
- the transmitted magnetic field being generated by the induced electrical current profile within the focusing device,
- the incident magnetic field having a frequency in the range 1 Hz-30 MHz.
An apparatus, the apparatus being a focusing device configured to obtain a magnetic field distribution from an incident magnetic field and improve a magnetic and/or electromagnetic device, said apparatus comprising:
- the focusing device having a first side and a second side, and including a plurality of conductive loops, a transmitted magnetic field emerging from the second side when the incident magnetic field is incident on the first side,
- the incident magnetic field inducing an electric current profile within the focusing device, the electric current profile inducing the transmitted magnetic field and having an induced current density,
- the magnetic field distribution being obtained using the transmitted magnetic field,
- the focusing device having a spatial profile of real values of a ratio of the transmitted magnetic field to a curl of the induced current density,
- the focusing device being configured for an incident magnetic field frequency in a range 1 Hz-30 MHz.
An apparatus, the apparatus being a focusing device configured to obtain a magnetic field distribution from an incident magnetic field and improve a magnetic and/or electromagnetic device, said apparatus comprising:
- the focusing device including a substrate supporting a patterned electrical conductor, the patterned electrical conductor providing a plurality of conductive loops,
- the focusing device having a first side and a second side, a transmitted magnetic field emerging from the second side when the incident magnetic field is incident on the first side,
- the incident magnetic field inducing an electric current profile within the patterned electrical conductor, the electric current profile inducing the transmitted magnetic field,
- the magnetic field distribution being obtained using the transmitted magnetic field,
- the focusing device being operable for an incident magnetic field frequency in a range 1 kHz-30 MHz.
Dependencies are inferred from the claim text.