be varied thereby controlling the output of the motor if desirable in a multi stator ring system two or more stator rings may be energized at a given time that is there is an overlap of time during which energization of two or more stator rings may occur this would provide beneficial torque on the rotor if each stator ring is energized for a very short time so that there is some time when no stator rings are energized during the rotation of the rotor assembly then the rotor assembly is subjected to discrete torque pulses or steps rather than the semi continuous torque application described above it will further be appreciated that by rearranging the energizing order of the stator rings 15 the rotor assembly 3 may be activated to rotate in a reverse direction some of the advantages of the invention over prior art devices particularly a commutator type motor are the motor may be provided with a relatively large diameter internal tubular opening which allows for provision of a differential internal the motor the individual electromagnetic stator parts can be inexpensively mass produced and easily replaced upon failure failure of a single electromagnetic part does not cause total failure of the motor when any electromagnetic component is energized it has an adjacent rotor assembly magnetic element with which to co act since the electromagnetic components are individual for each stator ring rather than being shared as in abraham adjacent stator rings may have overlapping energization times the stator assembly can be manufactured in two identical halves from one die to thereby reduce manufacturing costs the fact that the motor does not require a motor housing together with the provision of the.