Moving magnet motor

An electric motor having limited rotation, said motor comprising a rotor comprising a permanent magnet with opposite poles, said rotor being rotatable about an axis, a coil around said rotor and coextensive therewith, said coil comprising a pair of spaced coil portions in opposition to the poles of said magnet and having a plurality of conductors extending substantially radially uniformly and in parallel with the axis of the rotor, means for supplying said coil portions with current, said coil being wired such that current moves in one direction in one of said portions while moving in the opposite direction in the other of said portions, said coil portions providing substantially uniform axial current sheets relative to said rotor and providing a constant torque per unit of current, and a continuous magnetic return structure around said coil.