Unstable Self-Excitation of Torsional Vibration in AC Induction Motor Driven Rotational Systems

[+] Author and Article Information
J. R. Shadley

The University of Tulsa, Tulsa, OK 74104

B. L. Wilson, M. S. Dorney

Oil Dynamics Inc., Tulsa, OK 74147

J. Vib. Acoust 114(2), 226-231 (Apr 01, 1992) (6 pages) doi:10.1115/1.2930252 History: Received January 01, 1991; Online June 17, 2008


The most common NEMA Design Classes of AC induction motors have speed-torque characteristics that can give rise to unstable self-excitation of torsional vibration in rotational systems during start-up. A torsional vibration computational model for start-up transients has been developed as a design tool for induction motor applications. Torsional instability can occur at speeds in the positive sloping segment of the motor’s speed-torque curve and is particularly acute when the mass moment of inertia of the load device is more than two times the mass moment of inertia of the motor rotor. The computational model is compared with an exact solution method and with a laboratory test of a motor-driven inertial load. Applications of the computational model to electric submersible pump (ESP) design cases are discussed.

Copyright © 1992 by The American Society of Mechanical Engineers
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