Electric to Mechanical Energy Conversion of Linear Ultra-Fast Electro-Mechanical Actuators Based on Stroke Requirements

QC 20141208
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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Capacitance
contacts
electric fields
eddy currents
finite element methods
HVDC circuit breakers
magnetic fields
thermal factors
Electrical Engineering
Elektro- och systemteknik

Magnusson, JesperKTH,Elektroteknisk teori och konstruktion(Swepub:kth)u1lnws1y (author)
Engdahl, GöranKTH,Elektroteknisk teori och konstruktion(Swepub:kth)u13sc4ho (author)
KTHElektroteknisk teori och konstruktion (creator_code:org_t)

In:Electrical Machines (ICEM), 2014 International Conference on: IEEE conference proceedings, s. -515

By the author/editor: Bissal, Ara, 198 ...; Magnusson, Jespe ...; Engdahl, Göran

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