Patent ID: 8120225

Claim:
A generator, comprising: a core; a coil disposed about the core; a first stationary magnetic field source disposed on a first end portion of the core, wherein a south pole of the first stationary magnetic field source is closer to the core than a north pole of the first stationary magnetic field source; a second stationary magnetic field source disposed on a second end portion of the core, wherein a north pole of the second stationary magnetic field source is closer to the core than a south pole of the second stationary magnetic field source, and the first and second stationary magnetic field sources are configured to apply a stationary magnetic field to the coil; and an external magnetic field source disposed outside the coil and configured to rotate about an axis to apply a moving magnetic field to the coil; wherein the external magnetic field source is aligned with a substantially neutral point along a longitudinal side of the coil in a configuration where a north pole of the external magnetic field source and a south pole of the external magnetic field source alternate being nearer to the coil in response to rotation of the external magnetic field source about the axis.