Importance

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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. In a further embodiment, the counting of voltage pulses can with the same type of sensors, provide a rotational velocity output. This operates either in conjunction with rotor position sensing in a motor, or as a separate stand-alone unit, i.e. a tachometer/speedometer.

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First Claim