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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.

Inventors:
 [1];  [2]
  1. McMurray, PA
  2. Murrysville, PA
Issue Date:
OSTI Identifier:
871354
Patent Number(s):
5714862
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01P - MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; monitoring; rotating; frequency; de-energized; induction; motors; rotational; speed; coasting; motor; measured; sensing; residual; electrical; voltages; power; terminals; eliminating; conventional; tachometer; equipment; additional; mechanical; components; modifications; terminal; voltage; signal; detected; transformed; dc; proportional; input; control; variable; controller; regulate; output; characteristics; relative; motor controller; power terminal; induction motor; rotational speed; voltage signal; variable frequency; dc voltage; motor control; mechanical components; power terminals; voltage proportional; electrical voltages; /318/324/

Citation Formats

Mikesell, Harvey E, and Lucy, Eric. Method and apparatus for monitoring the rotating frequency of de-energized induction motors. United States: N. p., 1998. Web.
Mikesell, Harvey E, & Lucy, Eric. Method and apparatus for monitoring the rotating frequency of de-energized induction motors. United States.
Mikesell, Harvey E, and Lucy, Eric. Thu . "Method and apparatus for monitoring the rotating frequency of de-energized induction motors". United States. https://www.osti.gov/servlets/purl/871354.
@article{osti_871354,
title = {Method and apparatus for monitoring the rotating frequency of de-energized induction motors},
author = {Mikesell, Harvey E and Lucy, Eric},
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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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