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Electric to Mechanical Energy Conversion of Linear Ultra-Fast Electro-Mechanical Actuators Based on Stroke Requirements
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-3515-3536
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2014 (English)In: Electrical Machines (ICEM), 2014 International Conference on, IEEE conference proceedings, 2014, -515 p.Conference paper, Published paper (Refereed)
Abstract [en]

The operational efficiency of ultra fast actuators usedas drives in high voltage direct current breakers are at best5 %. To boost their efficiency, the design of the energizing circuitis crucial. A multi-physics finite element method (FEM) modelcoupled with a SPICE circuit model that is able to predict theperformance of the actuator with an accuracy of at least 95 % hasbeen developed and verified experimentally. Several variants ofprototypes and models have been simulated, built, and tested.It was shown that one of the main problems leading to lowefficiencies is the stroke of the drive. However, there is a possibilityto increase the efficiency of the electric to mechanical energyconversion process of the studied Thomson (TC) and double sidedcoils (DSC) to a maximum of 54 % and 88 % respectively iftheir stroke is minimized. This can be done at the expense ofincreasing the complexity and the cost of the contact system bydesigning a switch with several series connected contacts that isencapsulated in a medium with a high dielectric strength. Anotherproposed solution is to design a current pulse with a rise timethat is considerably shorter than the mechanical response time ofthe system. Parametric variations of capacitances and chargingvoltages show that the TC and the DSC can achieve efficienciesup to 15 % and 23 % respectively. Regardless of the chosenmethod, the DSC has a superior efficiency compared to a TC.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2014. -515 p.
Keyword [en]
Capacitance, contacts, electric fields, eddy currents, finite element methods, HVDC circuit breakers, magnetic fields, thermal factors
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-156527DOI: 10.1109/ICELMACH.2014.6960228ISI: 000358567800074Scopus ID: 2-s2.0-84916211337OAI: oai:DiVA.org:kth-156527DiVA: diva2:766972
Conference
International Conference on Electrical Machines (ICEM), 2014,2-5 Sept. 2014, Berlin, Germany
Note

QC 20141208

Available from: 2014-11-28 Created: 2014-11-28 Last updated: 2017-06-09Bibliographically approved

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Magnusson, Jesper

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