Focusing device for low frequency operation

摘要

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.

主权项

1. 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.