Optimal Efficiency Speed Control of Induction-motors By Variable Rotor Impedance

Document Type

Article

Publication Date

6-1989

Publication Title

IEEE Transactions on Energy Conversion

Volume

4

Issue

2

First page number:

216

Last page number:

223

Abstract

An optimal method to control the speed of a wound-rotor induction motor by variable external rotor impedance is presented. The rotor impedance is adjusted so that, for any desired torque and slip values, the total copper losses are minimized. Motor efficiency is improved compared with the case of conventional speed control by variable rotor resistance only. An example illustrates the copper loss reduction and dynamic behavior of the drive. Simulation study results that show the percentage copper loss reduction is generally likely to be higher for lighter loads. For constant-torque loads, the reduction percentage reaches a peak at the lower slip values, whereas for fan-type loads the most significant percentage copper-loss reduction occurs at both the higher and lower slip values. The response time of the rotor speed for start-up or a sudden change in the speed setting is considerably smaller than that achieved by pure rotor resistance control.

Keywords

Copper; Electric motors; Induction; Electric resistance; Mechanical efficiency; Motors--Reliability

Disciplines

Controls and Control Theory | Electrical and Computer Engineering | Electrical and Electronics | Electronic Devices and Semiconductor Manufacturing | Power and Energy | Signal Processing

Language

English

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

UNLV article access

Search your library

Share

COinS