A field gradient motor with a stator solenoid coil, a stator solenoid coil retained by a stator solenoid coil housing, a shaft rotatably retained in proximity to the stator solenoid coil, and a rotor retained relative to the shaft. The rotor has a plurality of iron disks retained by the shaft, and the stator solenoid coil, the plurality of iron disks, and the shaft cooperate to produce an axial closed toroidal B-field in a surrounding volume of air and an electromagnetic action of the motor. Radial notches with 45 degree equilateral triangular cross sections communicate radially on first and second faces of each disk. Where the notches are 360/N degrees wide, they can be 360/N degrees deep.