Opto-electronic bachometer and position detector of an electric

Details Opto-electronic bachometer and position detector of an electric Opto-electronic bachometer and position detector of an electric

1990-01-10

1991-06-04

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

318640, 25023118, G01P 336, G05B 106, G01D 534

Patent

active

050217356

ABSTRACT:
A device for determining the rotational speed and position of a rotor of an electric motor having at least one signal track arranged on the rotor includes at least one sensor located at a stator-side of the electric motor for scanning the signal track, and an evaluation circuit connected to the sensor, the sensor being sensitive to given stimuli of the signal track for alternatively adopting one of three different states which individually produce levels of different magnitude; the evaluation circuit including detectors responsive in accordance with the levels, for cutting off levels of given magnitude so that a recognition of the rotor position is derivable from a first and a second one of the three states, and the rotational speed is derivable from the third one of the three states.

REFERENCES:
patent: 4228396 (1980-10-01), Palombo et al.
patent: 4866268 (1989-09-01), Tang et al.

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