Advanced

Induction Machine Speed Estimation - Observations on Observers

Peterson, Bo LU (1996)
Abstract (Swedish)
Popular Abstract in Swedish

Asynkronmotorn är den mest använda elektriska motorn i industriella tillämpningar. För att effektivt kunna varvtalsreglera asynkronmotorn har varvtalet hittills behövt mätas. Den extrautrustning som krävs för varvtalsmätning är dyr och komplicerad. Avhandlingen presenterar en metod som beräknar, eller upskattar varvtalet, istället för att mäta det. För att beräkna varvtalet räcker det att spänning och ström mäts, vilket är enklare än varvtalsmätning.
Abstract
This work focuses on observers estimating flux linkage and speed for induction machines, mainly in the low speed region. With speed estimation, sensorless control is possible, meaning that the speed of induction machines without mechanical speed sensors can be controlled. The observer based sensorless drive system has superior dynamic performance compared to a system with an open loop frequency inverter, yet it is neither more complex nor expensive. Using mechanical equivalent models of the induction machine and observers, an accurate flux observer working in the entire speed region of the induction machine is presented. The flux observer is expanded into a combined flux and speed observer, measuring only stator current and voltage. A... (More)
This work focuses on observers estimating flux linkage and speed for induction machines, mainly in the low speed region. With speed estimation, sensorless control is possible, meaning that the speed of induction machines without mechanical speed sensors can be controlled. The observer based sensorless drive system has superior dynamic performance compared to a system with an open loop frequency inverter, yet it is neither more complex nor expensive. Using mechanical equivalent models of the induction machine and observers, an accurate flux observer working in the entire speed region of the induction machine is presented. The flux observer is expanded into a combined flux and speed observer, measuring only stator current and voltage. A method for sensorless control is proposed, analyzed and experimentally verified. Observer and controller calculations are performed by a digital signal processor. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • PROF. em. DR.-ING. DR. h.c. Leonhard, W., TU Braunschweig
organization
publishing date
type
Thesis
publication status
published
subject
keywords
control engineering, robotics, Automation, Elektronik och elektroteknik, Electronics and Electrical technology, estimation, sensorless control, observer, induction machine, Automatiska system, robotteknik, reglerteknik
pages
136 pages
publisher
IEA, LTH, Box 118, SE-221 00 Lund, Sweden,
defense location
LTH, M-building, room M:B, at 10.15
defense date
1996-03-01 10:15
external identifiers
  • other:LUTEDX/(TEIE-1009)/1-136/(1996)
language
English
LU publication?
yes
id
917e5507-3a8e-489d-9c8f-d8e6ebcd0ad0 (old id 17566)
date added to LUP
2007-05-24 09:56:28
date last changed
2016-09-19 08:45:05
@phdthesis{917e5507-3a8e-489d-9c8f-d8e6ebcd0ad0,
  abstract     = {This work focuses on observers estimating flux linkage and speed for induction machines, mainly in the low speed region. With speed estimation, sensorless control is possible, meaning that the speed of induction machines without mechanical speed sensors can be controlled. The observer based sensorless drive system has superior dynamic performance compared to a system with an open loop frequency inverter, yet it is neither more complex nor expensive. Using mechanical equivalent models of the induction machine and observers, an accurate flux observer working in the entire speed region of the induction machine is presented. The flux observer is expanded into a combined flux and speed observer, measuring only stator current and voltage. A method for sensorless control is proposed, analyzed and experimentally verified. Observer and controller calculations are performed by a digital signal processor.},
  author       = {Peterson, Bo},
  keyword      = {control engineering,robotics,Automation,Elektronik och elektroteknik,Electronics and Electrical technology,estimation,sensorless control,observer,induction machine,Automatiska system,robotteknik,reglerteknik},
  language     = {eng},
  pages        = {136},
  publisher    = {IEA, LTH, Box 118, SE-221 00 Lund, Sweden,},
  school       = {Lund University},
  title        = {Induction Machine Speed Estimation - Observations on Observers},
  year         = {1996},
}