Abstract
| Original language | English |
|---|---|
| Qualification | Doctor Degree |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 18 Sep 2009 |
| Place of Publication | Espoo |
| Publisher | |
| Print ISBNs | 978-951-38-7348-6 |
| Electronic ISBNs | 978-951-38-7349-3 |
| Publication status | Published - 2009 |
| MoE publication type | G5 Doctoral dissertation (article) |
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Keywords
- induction machine
- electromagnetic actuator
- rotor-dynamics
- self-bearing machine
- bearingless drive
- mechanical vibration
- active control
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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: Thesis › Dissertation › Collection 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 -