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Nonreciprocal Transformer

IP.com Disclosure Number: IPCOM000093707D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Chang, H: AUTHOR

Abstract

A uniaxial magnetic film or slab can be utilized as the core of a nonreciprocal transformer. The latter furnishes an output only when it is excited on a given primary side.

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Nonreciprocal Transformer

A uniaxial magnetic film or slab can be utilized as the core of a nonreciprocal transformer. The latter furnishes an output only when it is excited on a given primary side.

When a uniaxial slab of magnetic material is subjected to a changing magnetic field that is applied parallel with the easy axis of the material, the magnetic flux produced by wall motion is likewise parallel with the easy axis. This flux change can induce a voltage only in a conductor that links the easy axis. On the other hand if a changing magnetic field is applied transverse to the easy axis i.e. along the hard axis of the material such a field causes the magnetic moments of the material to rotate with respect to the easy axis. This induces a voltage in any conductor that links the slab, regardless of its orientation. This principle is shown in a uniaxial magnetic slab linked by two conductive loops. The primary winding loop extends parallel to the easy axis of the slab. The secondary winding loop is at right angles to the easy axis. By applying to the primary winding a voltage pulse or wave having a voltage-time integral less than the total flux of the magnetic slab, there is induced in the secondary winding a voltage change of similar waveform having a magnitude determined by the slab dimensions. This output voltage results from the rotation of the magnetic moments in a clockwise or counterclockwise direction away from their easy-axis position, as indicated by th...