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Prestandautvärdering av permanentmagnetmotor
KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
2014 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Performance evaluation of permanent magnet motor (English)
Abstract [sv]

Examensarbetet var en utvärdering av en synkron trefas permanentmagnetmotor med utvändig rotor. Den är tänkt att ingå i ett batterimatat drivsystem för hjälputrustning på segelbåtar. Målen var att kartlägga prestandan i standardutförande samt att hitta de svaga punkterna i konstruktionen. Förslag på hur motorutförandet kan optimeras ska också läggas fram.

 

Tester och mätningar gjordes i en testuppkoppling med växelriktare, motor och axelkopplad generator. Detta för att kunna få fram fler mätvärden på motorn. Generatorn fick varvtalskortslutning när belastningsströmmen kom upp i 106,1 A och testerna fick avslutas. Koppartråden i lindningarna blev för varm och ytskiktet smälte. Testerna visar att motorn klarar av strömmar upp till 92,1 A och har då en verkningsgrad på 70 %. Det var lindningens strömtålighet tillsammans med effektförlusterna som var den begränsande faktorn i motorkonstruktionen.

 

Forcerad kylning i form av vattenkyld stator eller att öka lindningstrådens strömtålighet genom att t.ex. en större kabelarea är alternativ för att få till en bättre verkningsgrad och motorprestanda. Ser man till externa lösningar skulle luftkylning med fläkt kunna adderas.

Abstract [en]

The project was to evaluate a synchronous three-phase permanent magnet motor with brushless outrunner. It is supposed to be a part of an electric drive system for equipment onboard sailing boats. The goal was to investigate the performance of the motor and find the construction weaknesses and to come up with suggestions how to optimize the performance of the motor.

 

Tests and measurements were made with a test setup that consisted of inverter, motor and a generator connected to the shaft. The generator stator winding had a short circuit when the load current reached 106,1 A and the tests therefore had to end. The copper wire used in the windings temperature became to high and the isolation of the wire melted.  The tests showed that the motor could handle up to 92,1 A with an efficiency of 70%. It was how much current the winding could withstand together with the power losses that was the limiting factor of the motor construction.

 

Forced cooling with water cooled stator or improving the winding wires ability to handle higher currents by increasing the cable area are both alternatives to get a better efficiency and motor performance.

Place, publisher, year, edition, pages
2014. , 40 p.
Series
TRITA-STH, 2014:66
Keyword [en]
permanent magnet motor, electrical drives
Keyword [sv]
permanentmagnetmotor, elektriskt drivsystem
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-146866OAI: oai:DiVA.org:kth-146866DiVA: diva2:725972
External cooperation
Effeco Group AB
Subject / course
Electrical Machines and Drives
Educational program
Bachelor of Science in Engineering - Electrical Engineering
Supervisors
Examiners
Available from: 2014-10-15 Created: 2014-06-17 Last updated: 2014-10-15Bibliographically approved

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CiteExportLink to record
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