A reactor includes a coil that includes a wound portion and a magnetic core that is arranged inside of the wound portion and outside of the wound portion, wherein the magnetic core is formed by combining a plurality of core pieces, at least one core piece of the plurality of core pieces is a first core piece constituted by a molded body of a composite material containing a magnetic powder and a resin, the first core piece includes a slit portion in a region arranged inside of the wound portion, a depth direction of the slit portion extends along a direction that intersects an axial direction of the first core piece, and the slit portion is provided so as to be open in an outer peripheral surface of the first core piece on one side of the depth direction and be closed on the other side.

The invention relates to a high-voltage transformer which is configured as a toroidal transformer. The high-voltage transformer has a magnetizable core (310) and a high-voltage winding (330) and a low-voltage winding (320) around the magnetizable core (310). The high-voltage winding (330) is embodied at least partially as a pilgrim step winding.

An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.

An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.

A contactless power supply coil unit includes coils wound around a center axis and a holder that holds the coils. The coils are spirally wound in plan view and overlap in an axial direction and respectively define layers stacked in the axial direction. The coils defining adjacent layers are connected in series to each other. The holder includes a core extending in the axial direction. The core includes a winding portions disposed along the axial direction. The coils are respectively wound around the winding portions. The outer diameters of the winding portions each change monotonically along the axial direction.