Abstract: A self-controlled synchronous motor is provided with at least one armature winding, a rotor rotatably mounted for rotation in proximity to the winding, and a magnet located on the rotor for providing a magnetic flux. At least one Fe-Ni sensor wire is located within the vicinity of variations in magnetic field intensity produced by rotor rotation and provides an output electrical signal indicative of the position of the rotor. The sensor wire in a preferred embodiment is comprised of a plastically twisted ferritic Fe Ni alloy which provides a substantial voltage output when placed within a magnetic field of varying intensity. In addition to the self-controlled synchronous motor there is further disclosed a method for operating such synchronous motors through the step of sensing changes in the magnetic field intensity during rotation of the rotor and in response to the sensed changes in magnetic field intensity applying current to one or more of the armature windings in the motor.

Abstract: Disclosed is a unique electromagnetic device, e.g. motor, construction in which a cylindrical tubular casing contains a stator assembly, a rotor assembly and bearings. The rotor assembly is supported by the bearings within the tubular casing which are in turn supported by a pair of end bells provided at each axial end of the tubular housing to close the same. Each axial end of the tubular housing contains, on an inner periphery thereof, an annular groove, at least one of the annular grooves having a tapered side wall at that side wall closest to an end of the housing such that the width of the associated groove progressively decreases along its depth. Each of the end bells contains a groove on an outer peripheral surface thereof which fits within the tubular housing, the outer peripheral grooves of the end bells substantially aligning with the interior peripheral grooves of the tubular housing.