{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T13:02:58Z","timestamp":1774357378705,"version":"3.50.1"},"reference-count":38,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2021,3,1]],"date-time":"2021-03-01T00:00:00Z","timestamp":1614556800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Fundaci\u00f3n M. D. Samuel Sol\u00f3rzano Barruso","award":["141276\/2018-5"],"award-info":[{"award-number":["141276\/2018-5"]}]},{"name":"Fundaci\u00f3n M. D. Samuel Sol\u00f3rzano Barruso","award":["FS\/21-2019"],"award-info":[{"award-number":["FS\/21-2019"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Energies"],"abstract":"<jats:p>Although this is a fact that is not very explored in the literature, there are two possible forms to connect the stator winding of an induction motor in the delta. The choice for one of these forms defines the amplitude of the stator transient current during the switching from star to delta connection when the motor is driven by a star-delta starting system, which is the most widely used and diffused method for starting an induction motor. One of the possible forms of the delta connection gives rise to a switching current with a relatively small amplitude, which gives it the denomination of preferential. The other form has a relatively higher amplitude of switching current, but it is the most recommended and indicated in diagrams of catalogues and motor plates. Therefore, it is here called \u201ccommon\u201d. With the aim of evidencing how the differences between these two forms of delta connection are manifested, this paper approaches the issue experimentally, through a methodology with statistical support, for a better characterization of the performance of each of these forms of delta connection, in the case of the widely popular star-delta starting method.<\/jats:p>","DOI":"10.3390\/en14051318","type":"journal-article","created":{"date-parts":[[2021,3,1]],"date-time":"2021-03-01T01:26:33Z","timestamp":1614561993000},"page":"1318","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Experimental Comparison of Preferential vs. Common Delta Connections for the Star-Delta Starting of Induction Motors"],"prefix":"10.3390","volume":"14","author":[{"given":"Jos\u00e9 Augusto","family":"Itajiba","sequence":"first","affiliation":[{"name":"Electrical Engineering Graduate Program, Electrical Engineering Department, Regional University of Blumenau, R. S\u00e3o Paulo 3250 (Itoupava Seca), Blumenau 89030-000, Brazil"}]},{"given":"C\u00e9zar Armando Cunha","family":"Varnier","sequence":"additional","affiliation":[{"name":"WEG Industries, R. Ven\u00e2ncio da Silva P\u00f4rto 399 (Nova Bras\u00edlia), Jaragu\u00e1 do Sul 89252-230, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9639-693X","authenticated-orcid":false,"given":"Sergio Henrique Lopes","family":"Cabral","sequence":"additional","affiliation":[{"name":"Electrical Engineering Graduate Program, Electrical Engineering Department, Regional University of Blumenau, R. S\u00e3o Paulo 3250 (Itoupava Seca), Blumenau 89030-000, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3723-616X","authenticated-orcid":false,"given":"St\u00e9fano Frizzo","family":"Stefenon","sequence":"additional","affiliation":[{"name":"Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil"},{"name":"Software Systems Engineering Department, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0446-9271","authenticated-orcid":false,"given":"Valderi Reis Quietinho","family":"Leithardt","sequence":"additional","affiliation":[{"name":"VALORIZA, Research Center for Endogenous Resources Valorization, Instituto Polit\u00e9cnico de Portalegre, 7300-555 Portalegre, Portugal"}]},{"given":"Ra\u00fal Garc\u00eda","family":"Ovejero","sequence":"additional","affiliation":[{"name":"Expert Systems and Applications Lab., E.T.S.I.I of B\u00e9jar, University of Salamanca, 37008 Salamanca, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1798-1215","authenticated-orcid":false,"given":"Ademir","family":"Nied","sequence":"additional","affiliation":[{"name":"Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil"}]},{"given":"Kin-Choong","family":"Yow","sequence":"additional","affiliation":[{"name":"Software Systems Engineering Department, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,1]]},"reference":[{"key":"ref_1","unstructured":"Udovichenko, A.V. (July, January 30). New Energy Saving Multizone Alternating-Voltage Soft Starters of Induction Machines. Proceedings of the International Conference and Seminar on Micro\/Nanotechnologies and Electron Devices Proceedings, Erlagol, Russia."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Mallick, T.C., Dhar, S., and Khan, J. (2015, January 10\u201312). Artificial Neural Network Based Soft-Starter for Induction Motor. Proceedings of the 2nd International Conference on Electrical Information and Communication Technologies (EICT), Khulna, Bangladesh.","DOI":"10.1109\/EICT.2015.7391951"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1109\/TEC.2009.2035692","article-title":"Adjustable Flux Three-Phase AC Machines with Combined Multiple-Step Star-Delta Winding Connections","volume":"25","author":"Cistelecan","year":"2010","journal-title":"IEEE Trans. Energy Convers."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"211","DOI":"10.1016\/S1474-6670(17)42792-3","article-title":"An Approach to Laboratory Training in Electric Drives","volume":"30","author":"Mircevski","year":"1997","journal-title":"IFAC Proc. Vol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1080\/09747338.2017.1404498","article-title":"A Systematic Method for Finding the Input Impedance of Two-terminal Networks","volume":"58","author":"Rathore","year":"2017","journal-title":"IETE J. Educ."},{"key":"ref_6","first-page":"1","article-title":"Starting Performance Improvement of Line-Start Permanent-Magnet Synchronous Motor Using Composite Solid Rotor","volume":"54","author":"Yan","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/TMAG.2017.2695079","article-title":"Design and Performance Analysis of a Self-Start Radial Flux-Hysteresis Interior Permanent Magnet Motor","volume":"53","author":"Rabbi","year":"2017","journal-title":"IEEE Trans. Magn."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1368","DOI":"10.1109\/TIA.2019.2962431","article-title":"Study on the Influence of Design and Optimization of Rotor Bars on Parameters of a Line-Start Synchronous Reluctance Motor","volume":"56","author":"Hu","year":"2020","journal-title":"IEEE Trans. Ind. Appl."},{"key":"ref_9","first-page":"1","article-title":"Comparative Parameters Investigation of Composite Solid Rotor Applied to Line-Start Permanent-Magnet Synchronous Motors","volume":"54","author":"Yan","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_10","first-page":"749","article-title":"A Mathematical Development of the Theory of the Magnetomotive Force of Windings","volume":"61","author":"Albert","year":"1923","journal-title":"J. Inst. Electr. Eng."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Ferreira, F.J.T.E. (2015, January 10\u201313). On the Star, Delta and Star-Delta Stator Winding Connections Tolerance to Voltage Unbalance. Proceedings of the IEEE International Electric Machines & Drives Conference (IEMDC), Coeur d\u2019Alene, ID, USA.","DOI":"10.1109\/IEMDC.2015.7409322"},{"key":"ref_12","unstructured":"Goh, H.H., Looi, M.S., and Kok, B.C. (2009, January 18\u201320). Comparison between Direct-On-Line, Star-Delta and Auto-Transformer Induction Motor Starting Method in Terms of Power Quality. Proceedings of the International Multiconference of Engineers and Computer Scientists (IMECS), Hong Kong, China."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3553","DOI":"10.1109\/TIA.2017.2693958","article-title":"Prediction of Losses and Efficiency for Three-Phase Induction Machines Equipped with Combined Star\u2013Delta Windings","volume":"53","author":"Misir","year":"2017","journal-title":"IEEE Trans. Ind. Appl."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1109\/TAI.1963.5407861","article-title":"Improved Starting Process Alternative to Conventional Star-Delta Switching of A-C Meters","volume":"82","year":"1963","journal-title":"IEEE Trans. Appl. Ind."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"403","DOI":"10.1109\/TEC.2012.2184114","article-title":"A Combined Wye-Delta Connection to Increase the Performance of Axial-Flux PM Machines with Concentrated Windings","volume":"27","author":"Vansompel","year":"2012","journal-title":"IEEE Trans. Energy Convers."},{"key":"ref_16","first-page":"1","article-title":"Rechts-und Linkslauf der Motoren bei Y-D-Anlauf","volume":"53","author":"Vercelli","year":"1978","journal-title":"Elektron. Ch"},{"key":"ref_17","unstructured":"Ko\u0146uhova, M., Ketners, K., Ketnere, E., and Klujevska, S. (2010, January 1\u20133). Research of the Effect of the Rotor Constant upon the Attenuation Characteristic if the Induction Motor Residual Voltage under the Switching Regime. Proceedings of the Problems of Present-Day Electrotechnics-2010 (PPE-2010): Conference Proceedings, Kiev, Ukraine."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Ferreira, F.J.T.E., Ge, B., Quispe, E.C., and de Almeida, A.T. (2014, January 2\u20135). Star-and Delta-Connected Windings Tolerance to Voltage Unbalance in Induction Motors. Proceedings of the International Conference on Electrical Machines (ICEM), Berlin, Germany.","DOI":"10.1109\/ICELMACH.2014.6960466"},{"key":"ref_19","unstructured":"Siemens, A.G. (2020, December 06). Grundlagen der Niederspannungs-Schalttechnik, Seite 21 B-1 Zum 21 B-4. Available online: https:\/\/cache.industry.siemens.com\/dl\/files\/099\/34973099\/att70195\/v1\/Grundlagen_der_Niederspannungs_Schalttechnik.pdf."},{"key":"ref_20","unstructured":"Bradley, A., and Low\u2014Voltage Switchgear and Controlgear (2020, December 06). Technical Document. 3\u201310, Rockwell Automation. Available online: http:\/\/literature.rockwellautomation.com\/idc\/groups\/literature\/documents\/rm\/lvsam-rm001-en-p.pdf."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Moros, O., and Gerling, D. (2014, January 2\u20135). Geometrical and Electrical Optimization of Stator Slots in Electrical Machines with Combined Wye-Delta Winding. Proceedings of the 2014 International Conference on Electrical Machines (ICEM), Berlin, Germany.","DOI":"10.1109\/ICELMACH.2014.6960463"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Stefenon, S.F., Seman, L.O., Schutel Furtado Neto, C., Nied, A., Seganfredo, D.M., da Luz, F.G., Sabino, P.H., Torreblanca Gonz\u00e1lez, J., and Quietinho Leithardt, V.R. (2020). Electric Field Evaluation Using the Finite Element Method and Proxy Models for the Design of Stator Slots in a Permanent Magnet Synchronous Motor. Electronics, 9.","DOI":"10.3390\/electronics9111975"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2013","DOI":"10.1109\/TLA.2019.9011546","article-title":"Deep Learning for Photovoltaic Generation Forecast in Active Solar Trackers","volume":"17","author":"Kasburg","year":"2019","journal-title":"IEEE Lat. Am. Trans."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"5667","DOI":"10.1049\/iet-gtd.2020.0814","article-title":"Hybrid Deep Learning for Power Generation Forecasting in Active Solar Trackers","volume":"14","author":"Stefenon","year":"2020","journal-title":"IET Gener. Transm. Distrib."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Ninno Muniz, R., Stefenon, S.F., Gouv\u00eaa Buratto, W., Nied, A., Meyer, L.H., Finardi, E.C., Marino K\u00fchl, R., de S\u00e1, J.A.S., and da Rocha, B.R.P. (2020). Tools for Measuring Energy Sustainability: A Comparative Review. Energies, 13.","DOI":"10.3390\/en13092366"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"590","DOI":"10.1109\/TLA.2019.8891883","article-title":"FEM Applied to Evaluation of the Influence of Electric Field on Design of the Stator Slots in PMSM","volume":"17","author":"Stefenon","year":"2019","journal-title":"IEEE Lat. Am. Trans."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Orosz, T., Rass\u00f5lkin, A., Kallaste, A., Ars\u00e9nio, P., P\u00e1nek, D., Kaska, J., and Karban, P. (2020). Robust Design Optimization and Emerging Technologies for Electrical Machines: Challenges and Open Problems. Appl. Sci., 10.","DOI":"10.3390\/app10196653"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"37","DOI":"10.3311\/PPee.13000","article-title":"Evolution and Modern Approaches of the Power Transformer Cost Optimization Methods","volume":"63","author":"Orosz","year":"2019","journal-title":"Period. Polytech. Electr. Eng. Comput. Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/TMAG.2015.2496905","article-title":"Metaheuristic Optimization Preliminary Design Process of Core-Form Autotransformers","volume":"52","author":"Orosz","year":"2016","journal-title":"IEEE Trans. Magn."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"P\u00e1nek, D., Orosz, T., and Karban, P. (2019). Artap: Robust Design Optimization Framework for Engineering Applications. arXiv.","DOI":"10.1109\/ICDS47004.2019.8942318"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1083","DOI":"10.3233\/JIFS-201279","article-title":"Photovoltaic Power Forecasting Using Wavelet Neuro-Fuzzy for Active Solar Trackers","volume":"40","author":"Stefenon","year":"2021","journal-title":"J. Intell. Fuzzy Syst."},{"key":"ref_32","unstructured":"Rolim, C.O., Schubert, F., Rossetto, A.G., Leithardt, V.R., Geyer, C.F., and Westphall, C. (June, January 30). Comparison of a Multi Output Adaptative Neuro-Fuzzy Inference System (MANFIS) and Multi Layer Perceptron (MLP) in Cloud Computing Provisioning. Proceedings of the 29th Brazilian Symposium on Computer Networks and Distributed Systems, Campo Grande, Brazil."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1109\/TEC.2007.914355","article-title":"Novel Multiflux Level, Three-Phase, Squirrel-Cage Induction Motor for Efficiency and Power Factor Maximization","volume":"23","author":"Ferreira","year":"2008","journal-title":"IEEE Trans. Energy Convers."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1109\/TIA.2017.2756931","article-title":"Current Waveform for Noise Reduction of a Switched Reluctance Motor Under Magnetically Saturated Condition","volume":"54","author":"Furqani","year":"2018","journal-title":"IEEE Trans. Ind. Appl."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Misir, O., and Ponick, B. (2014, January 1\u20134). Analysis of Three-Phase Induction Machines with Combined Star-Delta Windings. Proceedings of the 2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE), Istanbul, Turkey.","DOI":"10.1109\/ISIE.2014.6864707"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Misir, O., Raziee, S.M., Hammouche, N., Klaus, C., Kluge, R., and Ponick, B. (2016, January 4\u20137). Calculation Method of Three-Phase Induction Machines Equipped with Combined Star-Delta Windings. Proceedings of the 2016 XXII International Conference on Electrical Machines (ICEM), Lausanne, Switzerland.","DOI":"10.1109\/ICELMACH.2016.7732522"},{"key":"ref_37","unstructured":"Sang-Hoon, K. (2017). Modeling of Alternating Current Motors and Reference Frame Theory. Electric Motor Control, Elsevier."},{"key":"ref_38","unstructured":"Cabral, S.H.L., and Matos, J. (2001). Simplified Modelling of Hysteresis for Power System Transformers Studies. International Conference on Power Systems Transients: Conference Proceedings, IPST 2001 (Federal University of Rio de Janeiro)."}],"container-title":["Energies"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1073\/14\/5\/1318\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:30:42Z","timestamp":1760160642000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1073\/14\/5\/1318"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,3,1]]},"references-count":38,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2021,3]]}},"alternative-id":["en14051318"],"URL":"https:\/\/doi.org\/10.3390\/en14051318","relation":{},"ISSN":["1996-1073"],"issn-type":[{"value":"1996-1073","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,3,1]]}}}