Parallel Disturbance Force Compensator for Electrical Machines

Kai Zenger, Anssi Sinervo, Juha Orivuori, Antti Laiho, Kari Tammi

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

1 Citation (Scopus)

Abstract

The objective of the research is to diminish unwanted forces generated by rotation and unbalanced rotor mass on the rotor of an electrical machine.
These forces, dependent on rotational speed, cause vibration that, when occurring in the machine's natural frequency, causes severe problems. Extra windings are built in the stator of the machine, and they are supplied with current to create an opposite force to the vibration.
The main task is to develop a new controller to the system, in order to continuously provide the needed voltage input to the new actuator.

The system was first modeled for finite element model (FEM) software, and based on FEM simulations a simplified state-space model was identified. Separate models for the rotor mechanics and for the actuator were created for convenience.
Input to the actuator model was voltage given by the controller, and the output was the compensating force to the rotor. The rotor model mapped total input force of rotor to displacement, vibration.
There was an internal feedback from rotor displacement to actuator, which was taken into account in the actuator model.

Because the source of vibration is well known, the problem was attacked at the very source. A compensator was designed for balancing the forces in the rotor.
The forces were not measured and remained thus unknown, but they could be estimated.
The adaptive compensator was designed so that other controllers can be used parallel, without having to make any changes to the compensator.
Original languageEnglish
Pages (from-to)12242-12247
JournalIFAC Proceedings Volumes
DOIs
Publication statusPublished - 2008
MoE publication typeA4 Article in a conference publication
Event17th IFAC World Congress - Seoul, Korea, Democratic People's Republic of
Duration: 6 Jul 200811 Jul 2008

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Rotors
Actuators
Controllers
Electric potential
Stators
Vibrations (mechanical)
Natural frequencies
Mechanics
Feedback

Cite this

Zenger, Kai ; Sinervo, Anssi ; Orivuori, Juha ; Laiho, Antti ; Tammi, Kari. / Parallel Disturbance Force Compensator for Electrical Machines. In: IFAC Proceedings Volumes. 2008 ; pp. 12242-12247.
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Parallel Disturbance Force Compensator for Electrical Machines. / Zenger, Kai; Sinervo, Anssi; Orivuori, Juha; Laiho, Antti; Tammi, Kari.

In: IFAC Proceedings Volumes, 2008, p. 12242-12247.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

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T1 - Parallel Disturbance Force Compensator for Electrical Machines

AU - Zenger, Kai

AU - Sinervo, Anssi

AU - Orivuori, Juha

AU - Laiho, Antti

AU - Tammi, Kari

PY - 2008

Y1 - 2008

N2 - The objective of the research is to diminish unwanted forces generated by rotation and unbalanced rotor mass on the rotor of an electrical machine. These forces, dependent on rotational speed, cause vibration that, when occurring in the machine's natural frequency, causes severe problems. Extra windings are built in the stator of the machine, and they are supplied with current to create an opposite force to the vibration. The main task is to develop a new controller to the system, in order to continuously provide the needed voltage input to the new actuator.The system was first modeled for finite element model (FEM) software, and based on FEM simulations a simplified state-space model was identified. Separate models for the rotor mechanics and for the actuator were created for convenience. Input to the actuator model was voltage given by the controller, and the output was the compensating force to the rotor. The rotor model mapped total input force of rotor to displacement, vibration. There was an internal feedback from rotor displacement to actuator, which was taken into account in the actuator model.Because the source of vibration is well known, the problem was attacked at the very source. A compensator was designed for balancing the forces in the rotor. The forces were not measured and remained thus unknown, but they could be estimated. The adaptive compensator was designed so that other controllers can be used parallel, without having to make any changes to the compensator.

AB - The objective of the research is to diminish unwanted forces generated by rotation and unbalanced rotor mass on the rotor of an electrical machine. These forces, dependent on rotational speed, cause vibration that, when occurring in the machine's natural frequency, causes severe problems. Extra windings are built in the stator of the machine, and they are supplied with current to create an opposite force to the vibration. The main task is to develop a new controller to the system, in order to continuously provide the needed voltage input to the new actuator.The system was first modeled for finite element model (FEM) software, and based on FEM simulations a simplified state-space model was identified. Separate models for the rotor mechanics and for the actuator were created for convenience. Input to the actuator model was voltage given by the controller, and the output was the compensating force to the rotor. The rotor model mapped total input force of rotor to displacement, vibration. There was an internal feedback from rotor displacement to actuator, which was taken into account in the actuator model.Because the source of vibration is well known, the problem was attacked at the very source. A compensator was designed for balancing the forces in the rotor. The forces were not measured and remained thus unknown, but they could be estimated. The adaptive compensator was designed so that other controllers can be used parallel, without having to make any changes to the compensator.

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