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A STABLE ADAPTIVE FLUX OBSERVER FOR A VERY LOW SPEED-SENSORLESS INDUCTION MOTOR DRIVES INSENSITIVE TO STATOR RESISTANCE VARIATIONS

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Last updated: 25 Dec 2024

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Abstract

n recent years, numerous attempts have been made to improve the performance of speed‌sensorless induction motor drives. Adaptive flux observer (AFO) is one of the machine model
based methods of speed estimation. Parameter variations, low-speed operation and the difficulty
encountered in the design of the feedback gain and the adaptation mechanism are the most critical
aspects affecting the accuracy and stability of this method. In this paper, design of the observer
feedback gain is proposed to ensure the stability over a wide range of operation especially in the
low-speed region. The characteristic equation of the closed loop speed estimator is derived. The
values of the adaptive law parameters corresponding to the marginal system stability are
determined based on Routh-Hunvitz criterion. The sensitivity of AFO to stator resistance
mismatch is studied. A stator resistance adaptation scheme for accurate speed estimation at low
speeds is derived using Popov's hyper-stability theory. The relation between the identification
error of the rotor speed and adaptive gains is clarified. An experimental setup based on a DSP
system is implemented. The simulation and experimental results confirm the efficacy of the
proposed approach

DOI

10.21608/erjm.2009.69410

Keywords

Sensorless control, Stability analysis, adaptive law design, low speed, stator resistance estimation

Authors

First Name

Moharned S.

Last Name

Zaky

MiddleName

-

Affiliation

Electrical Engineering Department, Faculty of Engineering, Minoufiya University, Shebin El-Kom, Egypt

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Volume

32

Article Issue

2

Related Issue

10531

Issue Date

2009-04-01

Receive Date

2020-01-29

Publish Date

2009-04-01

Page Start

201

Page End

210

Print ISSN

1110-1180

Online ISSN

3009-6944

Link

https://erjm.journals.ekb.eg/article_69410.html

Detail API

https://erjm.journals.ekb.eg/service?article_code=69410

Order

10

Type

Original Article

Type Code

1,118

Publication Type

Journal

Publication Title

ERJ. Engineering Research Journal

Publication Link

https://erjm.journals.ekb.eg/

MainTitle

A STABLE ADAPTIVE FLUX OBSERVER FOR A VERY LOW SPEED-SENSORLESS INDUCTION MOTOR DRIVES INSENSITIVE TO STATOR RESISTANCE VARIATIONS

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Article

Created At

22 Jan 2023