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Study the influence of the alignment and  nearby metallic objects on the Hall sensor system for current measurement in Resistance Spot Welding Machine
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (Power Electronics)ORCID iD: 0000-0002-8466-946X
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (Power Electronics)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (Power Electronics)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
2011 (English)In: 2011 10th International Conference on Environment and Electrical Engineering, EEEIC.EU 2011 - Conference Proceedings, IEEE conference proceedings, 2011, Art. no. 5874717- p.Conference paper, Published paper (Refereed)
Abstract [en]

A technique for measuring the current of a stationaryspot welding unit using a Hall sensor system is implemented. HallEffect sensor is used to sense the strength of the magnetic fieldproduced by the current, flowing through the welding electrodes,on the secondary side of welding transformer. In contrast to acurrent transformer the Hall Effect sensor can read a DC currentand can thus be utilized in direct current welding equipments. Inthis paper the influence of the sensor position and presence of thetools or other materials in the proximity of the sensor that effectthe sensor reading is investigated. COMSOL Multiphysicssoftware is used to investigate these effects and a circuit design isimplemented according to the conclusion drawn from the simulations.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011. Art. no. 5874717- p.
Keyword [en]
Current; Hall effect sensor; Magnetic flux Density; Reistance spot welding
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:miun:diva-14582DOI: 10.1109/EEEIC.2011.5874717Scopus ID: 2-s2.0-79959968204Local ID: STCOAI: oai:DiVA.org:miun-14582DiVA: diva2:446205
Conference
2011 10th International Conference on Environment and Electrical Engineering, EEEIC.EU 2011;Rome;8 May 2011through11 May 2011;Category numberCFP1151I-CDR;Code85363
Available from: 2011-10-06 Created: 2011-10-06 Last updated: 2016-10-19Bibliographically approved
In thesis
1. Power electronics for resistance spot welding equipment
Open this publication in new window or tab >>Power electronics for resistance spot welding equipment
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Resistance spot welding is an inexpensive and efficient way ofjoining metals. It has extensive applications in household appliancesand in automotive industries. The traditional approach in relation tospot welding machines is to use 50 Hz welding transformers. Thedrawback associated with these transformers is that they are both heavyand bulky. Moreover, the fusing requirements become larger due toincreased welding power.With the development of high power semiconductor switches andDC-DC converter topologies, it is now possible to develop inverterdrive resistance spot welding equipment (RSE) which can be operatedat frequencies higher than the 50Hz frequency. The advantage of usinghigh frequencies is the reduction in the size of the transformer.Moreover, the fusing requirements are relaxed, as the power is sharedbetween three phases.In many industrial applications long welding arms are requiredbetween the transformer and the weld spot, which increases theinductance. The parasitic inductance in welding arms limits themaximum rate of change of the current. In order achieve a higher powerthe current has to be rectified. To rectify a current of the order of tenthof kA is challenging task and is one of the major sources of loss.The full bridge converter topology is used for the inverter drive RSE.The power switches used in the converter are IGBT. In RSE, the DClink capacitors are used to store high energy. In the case of circuitfailure, the stored energy can cause the IGBT device to rupture and inorder to avoid this, a protection scheme is discussed in this work.A controller circuit, using a DSPIC33FJ16GS502 controller, isdeveloped in order to drive a high frequency full bridge converter,which can also be used to drive the IGBTs in the RSE.The secondary side welding current is of the order of kilo amperes.A requirement for the welding control is that the current must be sensedprecisely and in order to fulfill this, a Hall sensor system has beendeveloped. This developed circuit is used in the feed-back control of theRSE. The presence of metallic objects and tools in the vicinity of theHall sensor system can affect its precision. We have estimated theivexclusion distance for the metal objects from the sensor by means of amodel developed in COMSOL Multiphysics software.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2012. 60 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 79
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-16699 (URN)STC (Local ID)978-91-87103-12-4 (ISBN)STC (Archive number)STC (OAI)
Available from: 2012-08-10 Created: 2012-08-10 Last updated: 2016-10-20Bibliographically approved
2. Power electronics for - and modelling of - resistance welding equipment
Open this publication in new window or tab >>Power electronics for - and modelling of - resistance welding equipment
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2013. 134 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 163
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-20947 (URN)STC (Local ID)978-91-87557-07-1 (ISBN)STC (Archive number)STC (OAI)
Supervisors
Available from: 2014-01-02 Created: 2014-01-02 Last updated: 2016-10-20Bibliographically approved

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Citation style
  • apa
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