General Electric Company

Russell E Tompkins

Gerald Burt Kliman

Robert P Alley

Vernon B Honsinger

Peter G Frischmann

Fred E Luborsky

Theodore R Haller

Marshall Gordon Jones

Loren H Walker

Donald W Jones

John P Walden

James F Norton

Robert P Wanger

Roger W Brockett

Franklin A Fisher

A vibratory linear motor system employs a comb-shaped electromagnet to excite transverse mechanical oscillations of a relatively thin, spring-like beam. The electromagnet establishes an approximate standing wave on the beam for which brakes mounted on either side of the beam provide independently established boundary conditions and produce rectified linear motion thereof. The brakes may be electromagnetically, magnetostrictively, or piezoelectrically actuated. An electronic control provides modulated currents to the exciter electromagnet and the brakes in order to control the rectified linear motion of the beam.

Vibratory linear motor system

A rotor for a self-starting permanent magnet AC motor is comprised of a permanent magnet disk mounted on a shaft of non-magnetic material. The magnet has a direction of magnetization parallel to the axis of the shaft resulting in two poles, one on each face of the magnet. Two disks of current carrying material are mounted on the shaft on either side of the magnet to act as starting coils. Pole pieces are mounted on the shaft and surround the starting disks. Claw-like projections spaced about and extending from the periphery of the pole pieces extend inwardly over the periphery of the magnet and starting disks. The claw-like projections from each pole piece are interlaced forming rotor poles of alternating polarity.

Rotor for a permanent magnet AC motor

Amorphous metal ribbon and thin conventional magnetic material is fully cut through by an electron beam and has no or minimal bead on the edge. The ribbon is bent around a roller while under the electron beam and centrifugal force removes molten metal from the cut. An alternative method is to partially cut through and mechanically deform the material to break the thinned section metal bridges remaining below the cut. Motor laminations so cut have negligible increase in thickness and stack compactly.

Cutting thin metal sheet with an electron beam

A lamp ballast has a pair of adjacent gapped 'O' magnetic cores made of nested, almost complete loops of amorphous metal strip with the gaps in the loops shaped and arranged under the secondary coil to simulate any type of restricted cross section for shaping the lamp current. A long slender reactor has a similar configuration in which the gaps are staggered; a different embodiment has a long central core of compressed amorphous metal flake and a helical overwrap of ribbon. An alloy of iron, boron, and silicon with a high B.sub.r /B.sub.s ratio is preferred for these inductive devices.

Amorphous metal ballasts and reactors

A rapid method of cutting thin amorphous metal sheet material is to use a focused heat source such as a laser beam or electron beam to heat local regions of the material above the crystallization temperature and form brittle crystalline lines along which the material fractures when it is mechanically deformed as by passage through a set of rollers. The material is not melted and does not form burrs. A higher packing factor is possible for motor and transformer laminations.

Cutting amorphous metal by crystallization with a laser or electron beam

A rotor is fabricated of a plurality of strips of thin amorphous metal wound side by side into adjacent coils about an axis, the flat sides of the strips being parallel to the axis. The rotor material is annealed to increase its coercive force to a value which may be up to 100 oersteds, rendering the rotor useful in a hysteresis type motor.

Amorphous metal hysteresis motor

A hard magnetic article made by casting a magnetically soft amorphous metal ribbon and shaping it to the form and size of the desired permanent magnet article, and then heat treating the resulting soft magnetic body and thereby converting the metal of the ribbon to the hard magnetic state.

Method of making permanent magnets and product

The secondary winding of a current transformer is driven by a high frequency AC source to excite the core to alternating, uniformly equal positive and negative peaks of current excitation. An inductance sensor alternately senses the secondary winding inductances at corresponding points adjacent the positive and negative peaks of the flux wave generated in the core. Any difference in these inductances is a function of low frequency primary current and is utilized to develop a current flowing through a tertiary core winding to equalize these inductances. This tertiary winding current thus becomes a precise measure of the primary current.

Apparatus for sensing current transformer primary current as a function

A magnetic alloy is cast as an amorphous metal ribbon and wound on a rotor shaft of a hysteresis motor and then heated to crystallize the metal ribbon and greatly increase its coercive force prior to assembling the rotor with the stator of the motor.

Method of making hysteresis motor rotor using amorphous magnetic alloy

The magnetic core of a lamp ballast is bifilar wound from inherently thin amorphous metal strip and utilizes the laminations of the magnetic circuit as the plates of a capacitor. The outer yoke of the core encases the coils and is edge-wound from amorphous metal ribbon alternated with insulation to also be the power factor capacitor. The inner core is accordion-pleated or spirally wound and is electrically connected to be the starting capacitor. Cutaways in the inner core cause saturation and shape the lamp current waveform.

Amorphous metal lamp ballast having a capacitor integral with the

Liquid amorphous metal alloy is manufactured into shaped laminations ready for assembly in an inductive component in one process. The rotating chill surface to which the melt is delivered has high thermal conductivity metal in a pattern corresponding to the shaped lamination and is surrounded by thermally insulating material. Melt coming in contact with the high thermal conductivity metal becomes amorphous and that contacting the thermally insulating areas cools more slowly and becomes crystalline. The brittle crystalline scrap is broken away from the strip of laminations and is collected and recycled to the melt.

Method and apparatus for fabricating amorphous metal laminations for

An electrical connector for applications where reliability and safety are needed uses transformer couplings made in two separable sections. Upon clamping together the surrounding metal housing halves, each inductively coupled pair of transformer windings is enclosed by the associated cup-type ferrite magnetic core to minimize undesired interference and result in good magnetic coupling.

Growing community of inventors

Scotia, NY, United States of America

Russell E Tompkins