eliminating the position sensor in a switched reluctance motor drive actuator application

173 Pages·2016·3.75 MB·English

by  Jinhui Zhang

UUnniivveerrssiittyy ooff KKeennttuucckkyy
UUKKnnoowwlleeddggee
University of Kentucky Doctoral Dissertations Graduate School
2005
EELLIIMMIINNAATTIINNGG TTHHEE PPOOSSIITTIIOONN SSEENNSSOORR IINN AA SSWWIITTCCHHEEDD
RREELLUUCCTTAANNCCEE MMOOTTOORR DDRRIIVVEE AACCTTUUAATTOORR AAPPPPLLIICCAATTIIOONN
Jinhui Zhang
University of Kentucky
RRiigghhtt cclliicckk ttoo ooppeenn aa ffeeeeddbbaacckk ffoorrmm iinn aa nneeww ttaabb ttoo lleett uuss kknnooww hhooww tthhiiss ddooccuummeenntt bbeenneefifittss yyoouu..
RReeccoommmmeennddeedd CCiittaattiioonn
Zhang, Jinhui, "ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE
ACTUATOR APPLICATION" (2005). University of Kentucky Doctoral Dissertations. 343.
https://uknowledge.uky.edu/gradschool_diss/343
This Dissertation is brought to you for free and open access by the Graduate School at UKnowledge. It has been
accepted for inclusion in University of Kentucky Doctoral Dissertations by an authorized administrator of
UKnowledge. For more information, please contact [email protected].
ABSTRACT OF DISSERTATION

Jinhui Zhang

The Graduate School

University of Kentucky

2005
ELIMINATING THE POSITION SENSOR IN A SWITCHED
RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION

ABSTRACT OF DISSERTATION

A dissertation submitted in partial fulfillment of the
requirements for the degree of Doctor of Philosophy in the
College of Engineering
at the University of Kentucky

By

Jinhui Zhang
Lexington, Kentucky
Director: Dr. Arthur V. Radun, Professor of Electrical engineering
Lexington, Kentucky
2005
Copyright © Jinhui Zhang 2005
ABSTRACT OF DISSERTATION

ELIMINATING THE POSITION SENSOR IN A SWITCHED
RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION
The switched reluctance motor (SRM) is receiving attention because of its merits:
high operating temperature capability, fault tolerance, inherent shoot-through preventing
inverter topology, high power density, high speed operation, and small rotor inertia. Rotor
position information plays a critical role in the control of the SRM. Conventionally,
separate position sensors, are used to obtain this information. Position sensors add
complexity and cost to the control system and reduce its reliability and flexibility.
In order to overcome the drawbacks of position sensors, this dissertation proposed
and investigated a position sensorless control system that meets the needs of an electric
actuator application. It is capable of working from zero to high speeds. In the control
system, two different control strategies are proposed, one for low speeds and one for high
speeds. Each strategy utilizes a state observer to estimate rotor position and speed and is
capable of 4 quadrant operation.
In the low speed strategy a Luenberger observer, which has been named the
inductance profile demodulator based observer, is used where a pulse voltage is applied
to the SRM’s idle phases generating triangle shaped phase currents. The amplitude of the
phase current is modulated by the SRM’s inductance. The current is demodulated and
combined with the output of a state observer to produce an error input to the observer so
that the observer will track the actual SRM rotor position. The strategy can determine the
SRM’s rotor position at standstill and low speeds with torques up to rated torque.
Another observer, named the simplified flux model based observer, is used for
medium and high speeds. In this case, the flux is computed using the measured current
and a simplified flux model. The difference between the computed flux and the measured
flux generates an error that is input to the observer so that it will track the actual SRM
rotor position. Since the speed ranges of the two control stragegies overlap, the final
control system is capable of working from zero to high speed by switching between the
two observers according to the estimated speed. The stability and performance of the
observers are verified with simulation and experiments.

KEYWORDS: Switched Reluctance Motor, Sensorless Control, Flux model, Real Time
Control, Actuator Application
ELIMINATING THE POSITION SENSOR IN A SWITCHED

RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION

By

Jinhui Zhang

Director of Dissertation

Director of Graduate Studies
RULES FOR THE USE OF DISSERTATION

Unpublished dissertations submitted for the Doctor’s degree and deposited in the
University of Kentucky are as a rule open for inspection, but are to be used only with
due regard to the rights of the authors. Bibliographical references may be noted, but
quotations of summaries of parts may be published only with the permission of the
author, and the usual scholarly acknowledgements.

Extensive copying or publication of the thesis in whole or in part requires also the
consent of the Dean of the Graduate School of the University of Kentucky.

A library that borrows this dissertation for use by its patrons is expected to secure the
signature of each user.

Name Date
DISSERTATION

Jinhui Zhang

The Graduate School
University of Kentucky
2005
ELIMINATING THE POSITION SENSOR IN A SWITCHED

RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION

DISSERTATION

A dissertation submitted in partial fulfillment of the
requirements for the degree of Doctor of Philosophy in the
College of Engineering
at the University of Kentucky

By
Jinhui Zhang

Lexington, Kentucky
Director: Dr. Arthur V. Radun, Professor of Electrical engineering
Lexington, Kentucky
2005
Copyright © Jinhui Zhang 2005
To my parents; Zhang, Senyou and Wang, Meifang, my wife, Li, Haoju, my sons, Leonald and Larry,
my sisters, Xijing and Jin’ge.