Direction sensing system for an AC power supply and AC motor dri

Details Direction sensing system for an AC power supply and AC motor dri Direction sensing system for an AC power supply and AC motor dri

1986-01-15

1987-12-01

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 83R, G01R 2500

Patent

active

047107030

ABSTRACT:
The direction of rotation of a three-phase voltage is determined by simultaneous reading of counters triggered by the respective phase zero crossings. Such determination is used in an AC motor drive to dispense of using a tachometer.

REFERENCES:
patent: 4206414 (1980-06-01), Chapman
patent: 4278937 (1981-07-01), Immler
patent: 4636720 (1987-01-01), Farr
patent: 4641088 (1987-02-01), Jacobsson

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