Speed indication for pump condition monitoring

Details Speed indication for pump condition monitoring Speed indication for pump condition monitoring

2006-03-16

2010-06-29

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C417S326000

Reexamination Certificate

active

07746063

ABSTRACT:
A method and apparatus are provided for obtaining the rotational speed of a pump system or other suitable rotating equipment having a self-contained pump electrical equipment power supply. The method features, before being rectified, directing one phase of AC power through a zero crossing circuit that identifies an instant of time the AC voltage crosses from one polarity to the other polarity and triggers a square wave pulse for each instant time. In operation, the AC voltage is detected when it crosses from a negative polarity to a positive polarity, or vice versa. The method also includes steps for measuring the period of the square wave pulse and calculating the speed of the pump or other rotating equipment.

REFERENCES:
patent: 4249120 (1981-02-01), Earle
patent: 4678404 (1987-07-01), Lorett et al.
patent: 5577890 (1996-11-01), Nielsen et al.
patent: 6534947 (2003-03-01), Johnson et al.
patent: 6798192 (2004-09-01), Faymon et al.
patent: 6857858 (2005-02-01), Jeun

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