Magnetic amplifier
OwnerDonato Bramantiinventor
Life of this patent
Estimating the term…
Abstract
A magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first coil on the ferromagnetic core has an AC excitation signal applied thereto and a second coil on the core is wound orthogonally to the first coil and is adapted to have an output signal derived therefrom. A control or input current in a third coil is used to unbalance the magnetic bridge formed by the four legs, so as to produce a mutual inductance different from zero between the first and second coil. The biasing may be provided by a fourth coil or by permanent magnet means.
Claims18
Magnetic apparatus comprising;
- a ferromagnetic core having multiple core legs defined at least in part by orthogonally disposed through holes in the core,
- means for biasing the ferromagnetic core to the non-linear operating segments of the hysteresis cycle,
- first coil means on the ferromagnetic core,
- means for applying an AC excitation signal to said first coil means,
- second coil means on the ferromagnetic core and wound orthogonally to said first coil means,
- means deriving an output signal from said second coil means,
- third coil means on the ferromagnetic core and means for applying a control signal to said third coil means,
- said ferromagnetic core has four legs defined by a pair of orthogonally disposed holes including first and second holes,
- said first coil means would on the core through said first hole in a first direction,
- said second coil means wound on the core through said second hole in a second direction generally orthogonal to said first direction,
- said third coil means wound on the core through both said first and second holes.
Magnetic apparatus comprising;
- a first magnetic circuit having a first through hole therein defining a first pair of magnetic circuit legs,
- a second magnetic circuit having a first through hole therein defining a second pair of magnetic circuit legs,
- means for completing the circuit between said first and second magnetic circuits including first and second permanent magnets, one at each end of the first and second magnetic circuits,
- said first and second permanent magnets disposing the first and second magnetic circuits in spaced relationship so as to form a second through hole orthogonal to said first through holes,
- continuous coil means would on said first and second pairs of magnetic circuit legs,
- means for applying an excitation signal to said coil means, and means for deriving an output signal from said coil means.
Strain sensing apparatus comprising;
- a first magnetostrictive circuit having a first through hole therein defining a first pair of circuit legs,
- a second magnetostrictive curcuit having a first through hole therein defining a second pair of circuit legs,
- means for completing the circuit between said first and second magnetostrictive legs including first and second permanent magnets, one at each end of the first and second magnetostrictive circuits,
- said first and second permanetnt magnets disposing the first and second magnetostrictive circuits in spaced relationship so as to form a second through hole orthogonal to said first through holes,
- a pair of non-magnetic members, one attached to each end of the first and second magnetostrictive circuits and having forces imparted thereto,
- continuous coil means wound on said first and second pairs of magnetostrictive circuit legs,
- means for applying an excitation signal to said coil means,
- and means for deriving an output signal from said coil means representative of strain from said applied forces.
Dependencies are inferred from the claim text.