Abstract: This inductive power transfer system provides a capacitor (15) having a pickup coil (14) in series between the windings of the pickup coil and the electrical load (16, 17, 18). A power-factor compensating capacitor (19) may be used at the feed to a loop of one or a few turns of primary inductor cable (11,12), so that a reasonable supply-mains current can maintain the primary inductor current. The length of the cable, and hence the impedance, of primary cable may be varied in order to match the primary inductor to the voltage of the supply mains.

Abstract: A discoidal dynamo-electric machine has a discoidal stator carrying a number of meandering copper windings imbedded in a substrate having a magnetic permeability of less than 20 relative to air, and a discoidal rotor mounted on a central shaft so that the rotor can be positioned close to and rotates in a plane parallel to that of the stator. The rotor has a circular array of permanent magnets mounted on a backing plate of mild steel, each of the magnets having a trapezoidal or a truncated sector of a circle shape, the magnets being closely spaced around the rotor to provide a series of closely apposed and alternating permanent magnetic poles.