A reactor is provided with a coil including a winding portion, and a magnetic core including an inner core portion to be arranged inside the winding portion and an outer core portion to be arranged outside the winding portion. The magnetic core includes a communication hole penetrating through the outer core portion and leading to the inner core portion, and a coupling shaft made of a composite material filled into the communication hole and coupling the inner core portion and the outer core portion. The composite material is obtained by dispersing a soft magnetic powder in a resin.

An electronic device in a wireless power system may be operable with a removable accessory such as a case. The device may have coplanar power transmitting and power receiving coils. The transmitting coil may be positioned within a central opening of the receiving coil. The removable accessory may have an embedded receiving coil configured to receive wireless power from the transmitting coil of the electronic device. The receiving coil of the electronic device may receive wireless power from a power transmitting device such as charging mat. The receiving coil of the electronic device may operate up to a higher maximum power than the transmitting coil of the electronic device. The power transmitting coil and power receiving coil in the electronic device may operate at different power transmission frequencies. To mitigate crosstalk, the power transmitting coil's operation frequency may be a non-integer multiple of the power receiving coil's operation frequency.

An electronic device in a wireless power system may be operable with a removable accessory such as a case. The device may convey wireless power to, from, or through the case while the device is coupled to the case. The device may have coplanar power transmitting and power receiving coils. The removable accessory may have an embedded switchable ferrimagnetic core and a coil that overlaps the switchable ferrimagnetic core. The switchable ferrimagnetic core may be operable in a first state where the switchable ferrimagnetic core is unsaturated. The switchable ferrimagnetic core may be operable in a second state where the switchable ferrimagnetic core is saturated by a magnetic field from a permanent magnet in a wireless power transmitting device. In the second state, the switchable ferrimagnetic core may have a lower magnetic permeability and higher magnetic reluctance than in the first state.

A reactor including a coil and a magnetic core, the magnetic core including a first inner core portion, a second inner core portion, a first outer core portion, and a second outer core portion. The reactor includes an inner resin portion and an outer resin portion, and the first outer core portion includes a first inner face that faces the coil, a first outer face on the opposite side to the first inner face, and an outward protruding portion protruding from the first outer face. When viewed from the first outer face side, the outer circumferential contour line of the outward protruding portion is located inside the outer circumferential contour line of the first outer face, and the end face of the outward protruding portion is exposed from the outer resin portion and is flush with the surface of the outer resin portion.

A solenoid (54) for a solenoid-actuated valve (30) includes a sintered powder metal one-piece core (64) of at least one soft magnetic material and at least one non-magnetic material integrally connected together and a movable armature (88) disposed in the core (64) and having a tapered tip to achieve a required force vs position and current characteristics.

A reactor includes an assembly of a coil and a magnetic core; a case; and a sealing resin portion filling the case and sealing at least a portion of the assembly. The case has an inner bottom surface, and a pair of coil facing surfaces that face side surfaces of the coil. The pair of coil facing surfaces have inclined surfaces that incline away from each other in a direction from the inner bottom surface side to an opposite side to the inner bottom surface. The coil includes a first winding portion disposed on the inner bottom surface side, and a second winding portion disposed opposite of the inner bottom surface with respect to the first winding portion. The first winding portion and the second winding portion are in a vertical arrangement and are parallel with each other. The second winding portion is wider than the first winding portion.

Various examples are provided related to mixed material magnetic cores, which can be utilized for shielding of eddy current induced excess losses. In one example, a magnetic core includes a ribbon core and leakage prevention or redirection shielding surrounding at least a portion of the ribbon core. The leakage prevention or redirection shielding can be positioned adjacent to the ribbon core and between the ribbon core and a magnetomotive force (MMF) source such as, e.g., a coil. The leakage prevention or redirection shielding extend beyond the ends of the MMF source and, in some implementations, can extend over the ends of the MMF source. In another example, a magnetic device can include a ribbon core, a MMF and leakage prevention or redirection shielding positioned between the MMF source and the ribbon core.

Provided are a power supply member in a wireless power supply system, and applications of the power supply member. The power supply member includes: a first magnetic sheet that includes a first metal magnetic powder and a first resin, the first metal magnetic powder having a ratio of a length of a long side to a length of a short side is more than 1.0; a coil that is wound around and arranged on one surface of the first magnetic sheet; and a second magnetic sheet that is arranged on the same surface of the first magnetic sheet as the surface where the coil is arranged, is arranged on at least one of a side inside of an inner peripheral end of the coil or a side outside of an outer peripheral end of the coil, and includes a second metal magnetic powder and a second resin.

A method for making an energy transfer element provides a magnetic core having a gap in a magnetic path, positions in the gap magnetizable material that produces an initial flux density, cures the suspension medium, and wraps one or more power windings around the magnetic path. When the magnetizable material is magnetized, a flux density produced by the magnetized material is offset from the initial flux density. The magnetizable material comprises a mixture of a suspension medium that includes uncured epoxy and magnetizable particles. The magnetizable particles are capable of permanent magnetic properties when magnetized. The particles of magnetic material having magnetic permeability of at least 1000μ.sub.o. The particles of magnetic material that have a magnetic permeability of at least 1000μ.sub.o and the particles of magnetizable particles are uniformly distributed in the suspension medium.

An inductor according to one embodiment of the present invention comprised: a magnetic core; and a coil wound around the magnetic core, wherein the magnetic core includes a plurality of stacked sub-magnetic cores, each sub-magnetic core includes a first magnetic body and a second magnetic body, the first magnetic body and the second magnetic core are different materials, the second magnetic body is arranged on a surface of the first magnetic body, each sub-magnetic core has a toroidal shape, and a permeability of the first magnetic body differs from a permeability of the second magnetic body.