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: 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 low-frequency induction heater includes a primary side coil having a core and a secondary side conductive hollow cylindrical member surrounding the primary side coil. An improvement to the Joule heat generation efficiency and a solution to problems peculiar to composite materials, such as thermal deformation, electrolytic corrosion, and difficulty is sought of manufacture by forming the conductive hollow cylindrical member of a sole stainless steel material of a thickness ranging from 2 mm to 6 mm. In a preferred embodiment, a coil 2 is wound around a rod-like core 1, which is in turn surrounded by a conductive hollow cylindrical member 3 made of a sole stainless steel material of a thickness ranging from 2 mm to 6 mm. When an AC current passes through the coil 2, an alternating magnetic field is set up in the axial direction of the coil 2, which causes an inducted current in the conductive hollow cylindrical member 3. Joule heat is thus generated in the member 3 due to the electric resistance thereof.

Abstract: A low frequency electromagnetic induction heater which applies a low voltage-high current performance transformer is disclosed. In the present heater, any space or vacancies between an induction coil and a metal heating pipe is excluded. This invention provides a high performance heater with the small temperature difference between the heating part and the material to be heated, high thermal efficiency, high reliability, high durability, and steady operation during a long period.

Abstract: A low-frequency electromagnetic induction heater includes a plurality of leg iron cores, a corresponding yoke iron core arranged on the leg iron cores, an induction coil wound around each leg iron core, and an iron plate or metal vessel for producing Joule heat with which the leg iron cores or induction coils are substantially in direct contact. The spaces between the yoke iron core, the leg iron cores and the induction coils are solidly filled with a resinous substrate which has been molded using molten resin. The induction heater produces less noise than other such heaters while providing a higher level of electromagnetic flux density.

Abstract: Disclosed is a low-frequency electromagnetic induction heater which comprises at least six induction coils each having a circular configuration and positioned in a circular and symmetrical configuration. The coils form three sets of coils such that each set of coils receives electrical power in a different phase from a three- phase electrical power source, such as a three-phase alternating current power source. The coils are interconnected such that the current flows from a first coil to a second other coil substantially opposed to the first coil. In a preferred embodiment, the heater consists of six coils connected in a three-phase double delta connection. This invention provides for heating of the heating element with continuous attraction to the induction coils, a substantial increase of electromagnetic flux density, prevention of noise due to electromagnetic vibration of the heating element, and high thermal efficiency.