- #1
Hammowe
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To the EE Forum,
I am a new guy on this Physics Forum and this is my first post. I have downloaded a free software code, Finite Element Method Magnetics (FEMM) solver (see http://www.femm.info/wiki/Download) but it doesn’t work because FEMM is limited to solving low frequency electromagnetic problems on two-dimensional planar and axisymmetric domains. FEMM addresses some limiting cases of Maxwell’s equations. The magnetics problems addressed are those that can be considered as “low frequency problems,” in which displacement currents can be ignored(displacement currents are typically relevant to magnetics problems only at radio frequencies).
Well, I'm in RF domain pulsing a circuit. The circuit is like the one in U.S. Patent No. 6,362,718, "Motionless Electromagnetic Generator, Mar. 26, 2002 (available from http://www.freepatentsonline.com). Details (sorry for the length!):
a system comprised of an AC power supply, a permanent magnet, a magnetic core, first and second input coils, first and second output coils, and a switching circuit. The magnetic core is positioned between opposite ends of the permanent magnet, and includes a first magnetic path around which the first pair of input and output coils extend, and a second magnetic path around which the second pair of input and output coils extend. The switching circuit drives electrical current alternately at 87.5 kHz (period of 11.45 microseconds) through the first and second input coils. The electrical current driven through the first input coil causes it to produce a magnetic field opposing a concentration of magnetic flux from the permanent magnet within the first magnetic path; likewise the electrical current driven through the second input coil produces a magnetic field opposing a concentration of magnetic flux from the magnet in the second magnetic path.
I am a new guy on this Physics Forum and this is my first post. I have downloaded a free software code, Finite Element Method Magnetics (FEMM) solver (see http://www.femm.info/wiki/Download) but it doesn’t work because FEMM is limited to solving low frequency electromagnetic problems on two-dimensional planar and axisymmetric domains. FEMM addresses some limiting cases of Maxwell’s equations. The magnetics problems addressed are those that can be considered as “low frequency problems,” in which displacement currents can be ignored(displacement currents are typically relevant to magnetics problems only at radio frequencies).
Well, I'm in RF domain pulsing a circuit. The circuit is like the one in U.S. Patent No. 6,362,718, "Motionless Electromagnetic Generator, Mar. 26, 2002 (available from http://www.freepatentsonline.com). Details (sorry for the length!):
a system comprised of an AC power supply, a permanent magnet, a magnetic core, first and second input coils, first and second output coils, and a switching circuit. The magnetic core is positioned between opposite ends of the permanent magnet, and includes a first magnetic path around which the first pair of input and output coils extend, and a second magnetic path around which the second pair of input and output coils extend. The switching circuit drives electrical current alternately at 87.5 kHz (period of 11.45 microseconds) through the first and second input coils. The electrical current driven through the first input coil causes it to produce a magnetic field opposing a concentration of magnetic flux from the permanent magnet within the first magnetic path; likewise the electrical current driven through the second input coil produces a magnetic field opposing a concentration of magnetic flux from the magnet in the second magnetic path.