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Reduction of a Detailed Thermal Model Lumped Parameters Approach for an OSV Induction Motor
KTH, School of Electrical Engineering and Computer Science (EECS).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis work is dealing with a detailed thermal model for an open self ventilated inductionmachine with lumped parameters approach. The model is entirely built using as referencespublished articles. The thermal network is tested using both MATLAB for calculating theparameters and SimScape for simulations and validation. Thermal resistances and capacitiesare fully depending on the geometry and material of the analysed motor, although the use ofCFD simulation results has been needed to model accurately the speed of the air circulatingin the inner part of the motor. Using results from the temperature rise test performed onthe OSV motor, the LP model is validated and subsequently an attempt of reduction ofthe model's order decreased the number of nodes from 78 to 24 with a reasonable loss ofaccuracy. During the reduction, a sensitivity analysis of the axial partition number and allthe resistances is presented. The goal of the model is to be suitable for control operation, hencethe inputs of the model are the duty cycle rotor speed and losses, copper iron and friction, astime variant arrays. The outputs are instead the temperature during the simulation time ofsensitive targets such as end windings, inner hotspot windings, rotor bars and bearings.

Abstract [sv]

Detta examensarbete behandlar en detaljerad, lumped-parameter baserad, termisk modell aven öppen, självventilerad asynkronmaskin. Den framtagna modellen är helt baserad på tidigare framtaget publicerat material. Det termiska nätverket är utvärderat med hjälp av Matlab (för att beräkna modellparametrar) och Simscape (för att utföra själva simuleringen samt tillhörande validering). De termiska resistanserna och kapacitanserna beror på geometri – och materialparameter kompletterat med parametrar framtagna med hjälp av CFD-simuleringar för att representera det termiska utbytet pga. den cirkulerande luften i maskinens kylkanaler och axiella ändar. Den framtagna modellen har validerats mot temperaturmätningar från ett experimentellt test. Efter detta har försök att reducera den framtagna modellens komplexited genom att minska antalet noder från 78 till 24 utan att felet I predikterade temperaturerökat signifikant. Målet med den reducerade modellen är att kunna implementera den I en regleralgoritm och dess indata är därför duty cycle, rotorvarvtal och förluster. Utdata från ren reducerade modellen är temperaturer på känsliga motordetaljer såsom ändlindningar, maximal temperaturer I statorspåren, rotorledarnas temperatur samt lagertemperaturer.

Place, publisher, year, edition, pages
2019. , p. 76
Series
TRITA-EECS-EX ; 2019:80
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-253197OAI: oai:DiVA.org:kth-253197DiVA, id: diva2:1324136
External cooperation
ABB
Educational program
Master of Science in Engineering - Electrical Engineering
Examiners
Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-06-13Bibliographically approved

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