Rotary angular position sensor with magnet and pole disk assembl

Details Rotary angular position sensor with magnet and pole disk assembl Rotary angular position sensor with magnet and pole disk assembl

1982-10-14

1985-03-05

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

123418, 310 68B, 324174, G01B 714, G01P 3487

Patent

active

045033919

ABSTRACT:
To provide bipolar needle pulses in which oppositely polarized pulses occur close together to form pulse pairs, with long time intervals between pulse pairs, a pair of pole disks (10, 11) are located on a rotor (91, 12) with a permanent magnet (13) interposed. The disks have radially and axially extending claws (15a, 15b, 16) formed thereon, the axial extensions being directed towards each other, but the claws (15a, 15b) projecting from one disk (10) being arranged in claw element pairs with which the claws (16) from the other disk, and magnetically oppositely polarized, are interdigited. The magnetic field, passing through the air gap between the claws, is sensed by a stationary pick-up such as a Hall sensor, a Wiegand sensor, or a magnetic field plate. When used for ignition timing of an internal combustion engine, the number of interdigited claws may correspond to the number of cylinders, and the claw pairs are spaced closely together so that the time (t.sub.b) between oppositely polarized pulse pairs (17, 18) derived from the change in magnetic field upon induction with the sensor, will be large with respect to the timing between oppositely polarized pulses.

REFERENCES:
patent: 3427485 (1969-02-01), Dotto
patent: 3505879 (1970-04-01), Vanderberg
patent: 3626223 (1971-12-01), Maier
patent: 3940645 (1976-02-01), Takita
patent: 4359657 (1982-11-01), Matsumoto et al.
patent: 4385276 (1983-05-01), Bitzel

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