A core includes a winding core, a first flange at a first end portion of the winding core, and a second flange at a second end portion of the winding core. The winding core has first and second surfaces on opposite sides, and first and second side surfaces intersecting the first and second surfaces and on opposite sides. The first flange has first and second surfaces on opposite sides, first and second side surfaces intersecting the first and second surfaces and located on opposite sides, an inner-side end surface connected to the first end portion of the winding core, and an outer-side end surface on an opposite side from the winding core. The inner-side end surface of the first flange has a first inclined surface between the first surface of the winding core and the first surface of the first flange.

A method of manufacturing a reactor includes a pair of coils and a pair of core units of partial I-shaped cores with gap members butted together and mounted in the coils. The respective ends of the I-shaped cores are pressed against the ends of a pair of U-shaped cores. The U-shaped cores and the I-shaped cores are formed by pressing powder in movable dies that preheat any burrs formed during pressing to be positioned in a direction different from the winding axis direction to avoid any contact with the coil.

A method of manufacturing a reactor includes a pair of coils and a pair of core units of partial I-shaped cores with gap members butted together and mounted in the coils. The respective ends of the I-shaped cores are pressed against the ends of a pair of U-shaped cores. The U-shaped cores and the I-shaped cores are formed by pressing powder in movable dies that preheat any burrs formed during pressing to be positioned in a direction different from the winding axis direction to avoid any contact with the coil.

A method of controlling molten metal flow and an electromagnetic brake system for a metal-making process, including: a first magnetic core arrangement having a first and second long sides with N.sub.c teeth, and arranged to be mounted to opposite longitudinal sides of an upper portion of a mould, a first set of coils, each being wound around a respective tooth of the first magnetic core arrangement, and N.sub.p power converters, with N.sub.p being an integer that is at least two and N.sub.c is an integer that is at least four and evenly divisible with N.sub.p, wherein each power converter is configured to feed a DC current to its respective group of 2N.sub.c/N.sub.p series-connected coils.

Provided are an elastomer composition including epoxy resin, acrylate resin, an organic filler, an inorganic filler, a cross linking agent, a hardener, an initiator and a solvent, and a magnetic ferrite for a wireless power transmitting and receiving device, the magnetic ferrite being coated with the elastomater composition having an elastic restoring force not to be damaged by a physical impact applied from the outside. According to embodiments of the present invention, the magnetic ferrite having improved impact resistance can be provided by being coating with the elastomer composition having the elastic restoring force, and thus an existing problem such as a reduction in magnetic property caused by damage to the ferrite resulting from an external impact can be solved.

The present invention relates to a power conversion device, comprising: at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor; a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the second secondary winding and the first secondary winding have the same number of coil turns; an deviation of inductance between the first primary winding and the second primary winding meets |Lm1Lm2|/(Lm1+Lm2)<=30%, Lm1 is the inductance of the first primary winding, and Lm2 is the inductance of the second primary winding.

The present invention relates to a power conversion device, comprising: at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor; a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the second secondary winding and the first secondary winding have the same number of coil turns; an deviation of inductance between the first primary winding and the second primary winding meets |Lm1Lm2|/(Lm1+Lm2)<=30%, Lm1 is the inductance of the first primary winding, and Lm2 is the inductance of the second primary winding.

An omnidirectional electromagnet (100) is disclosed. The omnidirectional electromagnet (100) comprises a ferromagnetic core (110) and three orthogonal solenoids (120, 130, 140) disposed about the core (110). Each solenoid (120, 130, 140) is adapted to receive a current from a current source to control an orientation and a magnitude of a magnetic field generated by the omnidirectional electromagnet (100). One or more omnidirectional electromagnets (100) can be used as a single magnetic manipulation system. The magnetic field generated by the omnidirectional electromagnet system can be used to control at least one of a force, a torque, an orientation, and a position of an adjacent magnetic object.

A coil arrangement is provided for generating a rotating electromagnetic field, comprising at least three coils, each having at least one associated coil winding. The coil arrangement further comprises a ferromagnetic coil yoke which establishes a magnetic coupling between the at least three coils.

A yoke includes an annular groove in which an exciting coil is stored, and a first through hole formed in the bottom of the annular groove. A terminal housing includes a boss portion fitted in the first through hole and a connecting concave portion located on the opposite side of the annular groove with respect to the boss portion. The boss portion includes a second through hole extending in a direction parallel to the center line of the first through hole. An external connecting terminal is buried in the terminal housing. The external includes a coil extraction hole continuing to the second through hole. The extraction end of the exciting coil is soldered to the terminal in a state in which the extraction end is passed through the second through hole and the coil extraction hole.