Patent ID: 8853879

Claim:
A well system, comprising: a well tubing through which a flow of fluid is conducted; and an electromagnetic generator disposed in the well tubing, the electromagnetic generator comprising: a rotor assembly having impeller members disposed in the flow of fluid to cause rotation of the rotor assembly; a power storage device; an excitation coil assembly comprising an inner excitation coil and an outer excitation coil, wherein the inner and outer excitation coils are paired in a rotor-stator relationship, and wherein the excitation coil assembly is selectively, electrically connected to the power storage device; a stator comprising a stationary core with the power storage device positioned within the stationary core, the stator being positioned within the rotor assembly such that the rotor assembly is rotatable about the stator and the power storage device, the power storage device supplying power for the excitation coil assembly; and a generator coil assembly electrically connected to the excitation coil assembly, wherein the generator coil assembly comprises an inner generator coil and an outer generator coil, wherein the inner and outer generator coils are paired in a rotor-stator relationship, the generator coil assembly generating electrical power during rotation of the rotor assembly when powered by the excitation coil assembly, wherein electromagnetic fields in the electromagnetic generator may be selectively eliminated by interrupting flow of electrical power from the power storage device to the excitation coil assembly to enable flushing of magnetic particles from the electromagnetic generator by the flow of fluid.