Abstract: A fluid cooled RF transmission cable, transformer primary or secondary winding, and induction heating coil incorporating litz cable is disclosed. The heating coil comprises: a litz cable including a bundle of mutually electrically insulated, intermixed wire filaments, and a coolant tube, surrounding the litz wire, for conveying a fluid for removing heat generated by the litz cable. Also a combined coolant and electrical connector for providing an electrical connection and coolant to an inductive heating coil including a coolant tube and a litz cable housed inside the coolant tube is described.

Abstract: An induction heater is provided which has an electrical conductor (40) extending along an axis B. At least one solid heating element (43) for contacting and transferring heat to a material to be heated extends radially from the axis B and is formed of electrically conductive and preferably ferromagnetic material. An alternating electric current is supplied to the electrical conductor (40) to induce an electric current in a closed loop defined by a surface layer of the or each heating element (43) to generate heat therein. Induced eddy currents are confined to a surface layer due to the skin effect. The radial and axial thickness of the heating elements (43) is greater than twice the skin depth of the electrically conductive material at the frequency of the alternating electric current. Preferably the heating element (43) is in the form of a screw arranged on an electrically conductive heating member (42).

Abstract: An asymmetric coil which has an "A" winding on one pole of the "C" core and a "B" winding of opposite helical twist, on the other pole, we can achieve relatively uniform, intense heating between the poles with relatively insignificant heating outside the poles. Only one core winding is active at one time. This coil allows us to heat uniformly to the ends of the susceptors on the ribs without remelting or overheating the welded area under the abutting spar, as FIG. 6 illustrates. The asymmetry provided by the two windings of opposite helical sense and the core design allows us to travel in either direction by activating the appropriate coil.

Abstract: An interstitial heater, made of an electrically conductive tube with a wire wound in a toroidal configuration about the tube and connected to a capacitor to form a tank circuit, is driven with a radiofrequency power source at resonance to provide tissue heating by thermal conduction.

Abstract: Transverse flux heating assembly for inductively heating a moving strip includes opposite spaced J-shaped conductors to form an inductive heating coil. The coils define a middle spacing therebetween which is unobstructed by flux guides to permit free translation movement between the conductors in a direction parallel to the strip width. The inductors provide a fully adjustable coil width to accommodate different strip widths in the heating operation.

Abstract: An electromagnetic induction heater in which magnetic flux diffusing members are fixed to at least two ends of an iron core wrapped with an electric wire to form a coil, and a metal plate is connected to the magnetic flux diffusing members to heat a wide area of the metal plate uniformly. By supplying a commercial low frequency alternating power source of 50-60 Hz to the coil, magnetic flux is generated in the iron core. The magnetic flux, flowing in the magnetic flux diffusing members, is diffused in a longitudinal direction. Diffused magnetic flux flows through the metallic plate to generate Joule heat over the plate. Therefore, the entire surface of the metal plate is heated uniformly. Either a single-phase or three-phase alternating power source is used in this invention.

Abstract: An apparatus for the inductive cross-field heating of flat material includes a plurality of mutually opposite induction loops being disposed above and below the flat material. At least one pair of induction modules is formed of two induction modules being adjustable independently of one another in their position relative to the flat material. Each induction module has two mutually opposite U-shaped induction loops having geometries and dimensions which are invariable, base legs which can be positioned in such a way that they terminate at least a predeterminable distance in front of one edge of the flat material and within the width of the flat material, and two side legs which can be positioned in such a way that they project at least a predeterminable distance beyond the other edge of the flat material.

Abstract: A high frequency bolt heater is provided which can heat up the inside of a narrow hole much faster than a conventional bolt heater employing a resistance wire. The high frequency bolt heater includes an induction heating coil made of a copper tube bent in a hairpin fashion and whose shape is made approximately circular in section by pinching a magnet between opposed portions thereof. The heater can be inserted into a hole bored in the axial direction of a metallic bolt. A length of the coil is made approximately equal with that of the bored hole, and the magnet is omitted from a region of the heater which corresponds to a screw portion of the bolt for mounting a nut. An adjustable stopper made of a heat resistant electrical insulator is provided for setting a necessary length of the induction heating coil to be inserted into the hole, and a heat resistant insulator is provided on the surface of the induction heating coil.

Abstract: An arrangement for severing a tension member of a permanent soil anchor of ferromagnetic material at a predetermined location includes a coil surrounding the tension member in a tubular manner at the predetermined location, wherein the coil is mountable together with the tension mender. A high temperature-resistant thermal insulation layer is provided underneath the coil and a tubular core is arranged between the high temperature-resistant layer and the tension member, so that the coil forms a primary winding and the core forms a first secondary winding and the tension member forms a second secondary winding. The tension member is severed by applying an electric current having a frequency of approximately 5 to 30 kHz and a voltage of approximately 500 to 800 V to the coil, so that the tensile strength of the tension member is reduced at the predetermined breaking point by the heat produced by induction resulting from the electric current.

Abstract: An improved transformer (10) for heating a selected filament during a stretching procedure to enhance the quality and tensile strength of the filament. The transformer (10) is fabricated around a spool body (12) which is mounted on a motor and received within a rotating shield. As power is supplied to the transformer (10), heat is generated, a portion of this heat being transferred to the rotating shield and finally to the selected filament. A base layer of insulation (14) is applied to an exterior surface of the spool body (12), including the flanges (32,38), for preventing generated heat from damaging the spool (12) and also to prevent an inductor wire (18) from shorting on the spool (12). The inductor wire (18) is wrapped from one end of the spool body (12) to the other. During the wrapping of the inductor wire (18), an insulating material (20) is sprayed on to fill any voids between the wire (18) and the spool (12), and between the individual turns of the inductor wire (18).

Abstract: A heating device for heating objects, such as moulding tools for preheating them, removing rubber, to produce shrink fit operations and other treatments of objects (11, 12, 13) which consist, at least partly, of metal, the device comprising a core (2) of electric conductive material and at least a coil (3, 4) which is arranged around the core (2) and connected to a current source (20) to generate a magnetic field, the flux of which is intended to follow the said core. The core (2) has two poles (5, 6), between which a space (7) can exist to supply objects (11, 12, 13) to the device (1) for heating treatment. One of the poles or both said poles (5, 6) are arranged to be able to be displaced in such a way that the core (2) can be closed or closed with an object (11, 12, 13) supplied and located between the poles (5, 6) for heating or treatment. A table (14) is arranged around the core (2 ) or one pole (6) of the core to unload the core (2) from loadings from an object (12, 13).

Abstract: An electromagnetic induction steam generator is compact or ultra-compact and highly efficient, and capable of continuous operation, intermittent operation and empty-heating operation. Magnetic flux passes through a closed magnetic circuit of two leg iron cores, a heater, and a yoke iron core after a low-frequency alternating current is supplied from a power supply to electric wire coils. Joule heat is generated inside the heater by the permeation of magnetic flux. When fluid such as water, is supplied from the fluid supply port, it is heated and becomes steam within the heating chamber. The steam then emerges from the steam output port.

Abstract: An induction heating device includes a handle having a hollow interior and two opposite ends, a wrist connected to one end of the handle, a U-shaped pole piece having two spaced apart ends, a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil, a head connected to the wrist and including a housing for receiving the U-shaped pole piece, the two spaced apart ends of the pole piece extending outwardly beyond the housing, and a power source connected to the tank circuit. When the tank circuit is energized and a susceptor is placed in juxtaposition to the ends of the U-shaped pole piece, the susceptor is heated by induction heating due to a magnetic flux passing between the two ends of the pole piece.

Abstract: A heater system provides a portable lightweight tool including the core and at least the primary winding of a transformer having a secondary that may be permanently or selectively coupled to a heater having a bifilar winding to reduce magnetic radiation; wherein the design of the system is such that voltages produced in the portable tool do not materially exceed 100 volts and are normally below 100 volts. The core of the transformer when employed in an arrangement wherein the secondary winding is permanently connected to the heater winding has a leg rotatable out of the closed core configuration whereby another leg of the core having the primary winding wound thereon may be inserted into the secondary winding. Alternatively the secondary winding may be wound on a short length of the core that is insertable into a leg of the transformer core on which the primary winding is wound.

Abstract: Disclosed is an electromagnetic induction heater in which magnetic flux diffusing members are fixed to at least two ends of an iron core wrapped with an electric wire to form a coil, and a metal plate is connected to the magnetic flux diffusing members to heat a wide area of the metal plate uniformly. By supplying a commercial low frequency alternating power source of 50-60Hz to the coil, a magnetic flux is generated in the iron core. The magnetic flux, flowing in the magnetic flux diffusing members, is diffused in a longitudinal direction. Diffused magnetic flux flows through the metallic plate to generate Joule heat over the plate. Therefore, the entire surface of the metal plate is heated uniformly. Either a single-phase or three-phase alternating power source is used in this invention.

Abstract: A radio frequency heating apparatus incorporating a radio frequency generater valve (5), a radio frequency impedance matching transformer (7) and a heating coil/element arrangement (14) which is arranged to be selectively displaceable with respect to a working zone, wherein the heating coil or heating element (14) is integrally associated with the radio frequency impedance matching transformer (7) and is so physically separated from the radio frequency generator valve (5) that on displacement of the heating coil/element arrangement the transformer is constrained to move therewith without mechanically displacing the generator valve (5).