US1637828A - Electrical apparatus - Google Patents

Description

Patented Aug. 2, 1927.

UNITED STATES.

PATENT OFFICE.

MARIUS LATOUR, OI PARIS, IRAN CE, ASSIGIOR TO LATOUR CORPORATION, 01' JERSEY CITY, NEW JERSEY, A CORPORATION OF DELAWARE.

ELECTRICAL APPARATUS.

No Drawing. Application filed August 19, 1921, Serial No. 493,662, and in France Kay 20, 1815.

(GRANTED UNDER THE TROVISIONS OF THE ACT 0F IARCK 3, 1921, 41 STAT. I, 1813.)

Difierent arrangements have been suggested for doubling ortrebling the frequency of single or polyphase alternating currents Heretofore, this has been accom lished by making use of the phenomenon w ereb the iron' cores in the magnetic circuits 0 the transformers or self induction coils are saturated, the said circuits being permanently magnetized by direct currents.

As a matter of fact, if theicurve illustrating the magnetizationof iron is studied it will be found that the'phenomenon of the multiplication of the frequency is not appreciable unless there is a sufficiently large Variation in the flux produced by the primary alternating current about the point representing the permanent direct current magnetization. This variation will be e. g. 2000 to 4000 gauss for high frequencies, 10000 to 20000 periods or more, being used in wireless telephone and telegraph apparatus. From the standpoint of iron losses, this variation will only give one half of this as a true inductive change, i. e., the variation will be from 1,000 to 2,000 .auss.

' On the other han it has been proved that from the standpoint of iron losses, in ordinary transformers it is advisable to reduce the utilized magnetic induction in proportion with the increase in the frequency. For very hi h frequencies, 20000 periods or more, prefer-i should be employed, themaxnnum being a few hundred gauss.

The multiplication of comparatively high frequencies can not be efficiently effected with the employment of ferrous core transformers owingto the large ma etic induction variations required resulting in excessive iron loss at the comparatively high frequencies.

In accordance with the resent invention, the multiplication of sue relatively high ly very low magnetic inductions frequencies is efliciently effected by the utilization of magnetic materials saturating at a considerably lower magnetic induction than ferrous cores and also possessing consider ably lower losses than ferrous cores at high frequencies.

Nickel answers these requirements. The induction variation that is necessary for effecting therein the phenomenon of frequency multiplication is approximately three or four times less than in case of ferrous cores resulting in considerably smaller core losses.

The nickel may be alloyed with any substance suitable for accentuating the elbow made by its magnetization curve, or for increasing its resistivity to reduce the Foucault currents, or even for decreasing its permeability.

As in the case of iron, the resistivity may be increased by the use of silicon.

The properties of the nickel may be improved by subjecting it to a mechanical influence, such as tension, compression or tor-' S1011.

It should be. understood, that the metal must be used in the thinnest possible sheets.

Having described my invention, what I claim is: a

1. In apparatus for distorting the wave form of h1gh-frequency alternating currents having a magnetic circuit and means for cyclically supersaturating it, a magnetic circuit com risin substantially all nickel.

. 2. Inighrequency apparatus relying upon the phenomenon of magnetic saturation forits operation and having a magnetic circuit and means for. cyclically supersaturating it, .a magnetic circuit comprising substantially all nickel and contai silicon adapted tbs; iicrease the sharpness o the saturation .mnrus LATOUR.