Electromechanical modelling and active control of flexural rotor vibration in cage rotor electrical machines: Dissertation

Antti Laiho

Research output: ThesisDissertationCollection of Articles

1 Citation (Scopus)

Abstract

The main objective of this thesis is to develop new tools for model-based control of flexural rotor vibration in cage induction machines. In order to exert the control force on the rotor, a built-in force actuator based on self-bearing principle is considered. A low-order parametric electromechanical model coupling the eccentric-rotor machine, the actuator and rotor-dynamics is developed. Furthermore, numerical analysis of the actuator-rotor system is considered. The numerical analysis is based on time-discretised finite element analysis of the electromagnetic fields in the two-dimensional cross-section of the machine. The finite element analysis is used to estimate the parameters of the low-order model. The numerical analysis provides a tool for both designing the actuator and testing the control algorithms. In the thesis, a control algorithm, previously used mainly in active magnetic bearings for compensation of harmonic disturbance forces, is applied by using the built-in force actuator. In the simulations, the control algorithm is embedded in the numerical analysis. The modelling and model-based control are verified by experiments. A 30 kW two-pole cage induction motor with an extended rotor shaft is used for measurements. The results both from simulations and experiments show that, by using the built-in force actuator, the model-based controller is suitable for flexural rotor vibration suppression in a cage induction machine. In particular, the stable operation at the critical speed of the machine can be achieved by using the methodology presented in this research.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Aalto University
Supervisors/Advisors
  • Arkkio, Antero, Supervisor, External person
Award date18 Sep 2009
Place of PublicationEspoo
Publisher
Print ISBNs978-951-38-7348-6
Electronic ISBNs978-951-38-7349-3
Publication statusPublished - 2009
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

Rotors
Actuators
Numerical analysis
Bearings (structural)
Finite element method
Magnetic bearings
Force control
Induction motors
Electromagnetic fields
Poles
Computer systems
Experiments
Controllers
Testing

Keywords

  • induction machine
  • electromagnetic actuator
  • rotor-dynamics
  • self-bearing machine
  • bearingless drive
  • mechanical vibration
  • active control

Cite this

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title = "Electromechanical modelling and active control of flexural rotor vibration in cage rotor electrical machines: Dissertation",
abstract = "The main objective of this thesis is to develop new tools for model-based control of flexural rotor vibration in cage induction machines. In order to exert the control force on the rotor, a built-in force actuator based on self-bearing principle is considered. A low-order parametric electromechanical model coupling the eccentric-rotor machine, the actuator and rotor-dynamics is developed. Furthermore, numerical analysis of the actuator-rotor system is considered. The numerical analysis is based on time-discretised finite element analysis of the electromagnetic fields in the two-dimensional cross-section of the machine. The finite element analysis is used to estimate the parameters of the low-order model. The numerical analysis provides a tool for both designing the actuator and testing the control algorithms. In the thesis, a control algorithm, previously used mainly in active magnetic bearings for compensation of harmonic disturbance forces, is applied by using the built-in force actuator. In the simulations, the control algorithm is embedded in the numerical analysis. The modelling and model-based control are verified by experiments. A 30 kW two-pole cage induction motor with an extended rotor shaft is used for measurements. The results both from simulations and experiments show that, by using the built-in force actuator, the model-based controller is suitable for flexural rotor vibration suppression in a cage induction machine. In particular, the stable operation at the critical speed of the machine can be achieved by using the methodology presented in this research.",
keywords = "induction machine, electromagnetic actuator, rotor-dynamics, self-bearing machine, bearingless drive, mechanical vibration, active control",
author = "Antti Laiho",
note = "Project code: 26153",
year = "2009",
language = "English",
isbn = "978-951-38-7348-6",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "712",
address = "Finland",
school = "Aalto University",

}

Electromechanical modelling and active control of flexural rotor vibration in cage rotor electrical machines : Dissertation. / Laiho, Antti.

Espoo : VTT Technical Research Centre of Finland, 2009. 98 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Electromechanical modelling and active control of flexural rotor vibration in cage rotor electrical machines

T2 - Dissertation

AU - Laiho, Antti

N1 - Project code: 26153

PY - 2009

Y1 - 2009

N2 - The main objective of this thesis is to develop new tools for model-based control of flexural rotor vibration in cage induction machines. In order to exert the control force on the rotor, a built-in force actuator based on self-bearing principle is considered. A low-order parametric electromechanical model coupling the eccentric-rotor machine, the actuator and rotor-dynamics is developed. Furthermore, numerical analysis of the actuator-rotor system is considered. The numerical analysis is based on time-discretised finite element analysis of the electromagnetic fields in the two-dimensional cross-section of the machine. The finite element analysis is used to estimate the parameters of the low-order model. The numerical analysis provides a tool for both designing the actuator and testing the control algorithms. In the thesis, a control algorithm, previously used mainly in active magnetic bearings for compensation of harmonic disturbance forces, is applied by using the built-in force actuator. In the simulations, the control algorithm is embedded in the numerical analysis. The modelling and model-based control are verified by experiments. A 30 kW two-pole cage induction motor with an extended rotor shaft is used for measurements. The results both from simulations and experiments show that, by using the built-in force actuator, the model-based controller is suitable for flexural rotor vibration suppression in a cage induction machine. In particular, the stable operation at the critical speed of the machine can be achieved by using the methodology presented in this research.

AB - The main objective of this thesis is to develop new tools for model-based control of flexural rotor vibration in cage induction machines. In order to exert the control force on the rotor, a built-in force actuator based on self-bearing principle is considered. A low-order parametric electromechanical model coupling the eccentric-rotor machine, the actuator and rotor-dynamics is developed. Furthermore, numerical analysis of the actuator-rotor system is considered. The numerical analysis is based on time-discretised finite element analysis of the electromagnetic fields in the two-dimensional cross-section of the machine. The finite element analysis is used to estimate the parameters of the low-order model. The numerical analysis provides a tool for both designing the actuator and testing the control algorithms. In the thesis, a control algorithm, previously used mainly in active magnetic bearings for compensation of harmonic disturbance forces, is applied by using the built-in force actuator. In the simulations, the control algorithm is embedded in the numerical analysis. The modelling and model-based control are verified by experiments. A 30 kW two-pole cage induction motor with an extended rotor shaft is used for measurements. The results both from simulations and experiments show that, by using the built-in force actuator, the model-based controller is suitable for flexural rotor vibration suppression in a cage induction machine. In particular, the stable operation at the critical speed of the machine can be achieved by using the methodology presented in this research.

KW - induction machine

KW - electromagnetic actuator

KW - rotor-dynamics

KW - self-bearing machine

KW - bearingless drive

KW - mechanical vibration

KW - active control

M3 - Dissertation

SN - 978-951-38-7348-6

T3 - VTT Publications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -