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Title: Method and apparatus for monitoring the rotating frequency of de-energized induction motors

Abstract

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor. 6 figs.

Inventors:
;
Issue Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
570427
Patent Number(s):
5714862
Application Number:
PAN: 8-649,974
Assignee:
Dept. of Energy, Washington, DC (United States)
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 3 Feb 1998
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; SPEED REGULATORS; DIAGNOSTIC TECHNIQUES; MEASURING METHODS; ELECTRIC POTENTIAL

Citation Formats

Mikesell, H E, and Lucy, E. Method and apparatus for monitoring the rotating frequency of de-energized induction motors. United States: N. p., 1998. Web.
Mikesell, H E, & Lucy, E. Method and apparatus for monitoring the rotating frequency of de-energized induction motors. United States.
Mikesell, H E, and Lucy, E. Tue . "Method and apparatus for monitoring the rotating frequency of de-energized induction motors". United States.
@article{osti_570427,
title = {Method and apparatus for monitoring the rotating frequency of de-energized induction motors},
author = {Mikesell, H E and Lucy, E},
abstractNote = {The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {2}
}