Axial and radial field electric rotating machines having relatively rotatable first and second stators

Year	Description
1991	Invention patented by Patrick W. Clarke on September 22th, 1991. Abstract: An adjustable speed drive system is provided which employs a unique induction machine which includes a rotor assembly mounted on a shaft, and associated cooperative first and second stators. The two stators are angularly adjustable, relative to each other, about the axis of the shaft. The net excitation of the rotor and thus the operating point of the machine on the torque-speed curve of a load on the shaft of the machine is a function of the relative angular displacement of the two stators. A third stator may be employed to enhance the efficiency of the machine by feeding excess rotor power back into the power line.
Source: selected by the editor from original sources.

Invention: Axial and radial field electric rotating machines having relatively rotatable first and second stators