North American Philips Corporation

William D Riggs

Edward O'Connor

Hermann Rosshirt

Joseph J Schegan

A magnetic position sensor system including a magnetic medium divided into a plurality of areas of magnetization for producing a magnetic field with a variable intensity. The magnetic medium includes a first side, a second side and a longitudinal axis. A Hall cell is used for detecting the intensity of the magnetic field produced by the magnetic medium and for producing an electric signal which corresponds to the intensity detected. The magnetic medium is movable with respect to the Hall cell so that the Hall cell scans along the first side of the medium along the longitudinal axis and detects the intensity of the magnetic field at any given point along the longitudinal axis of the medium.

Position detecting apparatus using variable magnetic field intensity

A DC electric motor, which is much quieter than previous DC motors, is disclosed. The inventive motor includes a rotor and a stator, and either the rotor or the stator includes tynes bearing windings. Significantly, the tynes are interconnected, which reduces vibration and noise.

Low noise DC electric motor

Torque motor

A brushless D.C. motor has electrical power switched between the phase windings by means of a circuit which includes a plurality of hall effect switches. The hall effect switches are operated by a plurality of arcuate commutating magnets which are radially polarized and are disposed axially adjacent to field magnets which are also radially polarized. Ordinarily, the direction of radial polarization of the commutating magnets and the field magnets will be opposite.

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Southington, CT, United States of America

William D Riggs