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Magnetic Pulse Emitter

IP.com Disclosure Number: IPCOM000090308D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Darling, RH: AUTHOR

Abstract

This magnetic pulse emitter produces a series of accurate, equally spaced pulses synchronized with a rotating shaft. The emitter comprises rotor 10 having four equally spaced pointed arms mounted for rotation with shaft 12. Stator portion 14 has four series of ten inwardly extending teeth positioned so that the pointed arms of rotor 10 are separated from the teeth portions by only a small air gap. Annular permanent magnet ring 16 is mounted adjacent to the base portion of rotor 10 to generate magnetic flux in the emitter. Coil 18 is mounted concentric with ring 16 in a position to sense the voltage resulting from changes in magnetic flux around the path comprising ring 16, rotor 10, stator 14, ring 20 and backplate 22.

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Magnetic Pulse Emitter

This magnetic pulse emitter produces a series of accurate, equally spaced pulses synchronized with a rotating shaft. The emitter comprises rotor 10 having four equally spaced pointed arms mounted for rotation with shaft 12. Stator portion 14 has four series of ten inwardly extending teeth positioned so that the pointed arms of rotor 10 are separated from the teeth portions by only a small air gap. Annular permanent magnet ring 16 is mounted adjacent to the base portion of rotor 10 to generate magnetic flux in the emitter. Coil 18 is mounted concentric with ring 16 in a position to sense the voltage resulting from changes in magnetic flux around the path comprising ring 16, rotor 10, stator 14, ring 20 and backplate 22. Relative motion between rotor 10 and stator 14, caused by turning of shaft 16, causes the flux around coil 18 to vary as the average air gap varies. By sensing the output voltage across coil 18, which is proportional to the flux change through the circuit, the output signal comprises a series of ten pulses when the pointed arms are aligned with the teeth on the stator portions separated by a time period determined by the time required for the pointed ends to pass the part of the stator on which no teeth are present. The amplitude of the output waveform is relatively large and of a relatively constant magnitude, since this output is due to a summation of the flux paths of each of the matching teeth.

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