Change search
ReferencesLink to record
Permanent link

Direct link
Design and Optimization of an IE44-pole 7.5 kW Induction Motor
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2014 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis, a High Efficiency (IE2), 7.5 kW, 4-pole, induction motor (IM) is studied

and redesigned using finite element method (FEM) software with the purpose of

increasing its efficiency to the new Super Premium Efficiency (IE4) level.

First, a pre-existing model of the motor is analyzed and improved. Then, different

methods to improve the efficiency of the motor are investigated and the performance

of the machine is studied after each modification. Thirdly, a complete optimization of

the design is carried out with the goal of developing an IE4 IM compatible with IEC

standard frames. Finally, a similar optimization of the motor is performed

substituting the aluminum squirrel cage by a copper one. The pros and cons of this

change are studied.

The results show the feasibility of reaching the IE4 efficiency level by this type of IM

with a standard shaft height. Preserving the original cross-section design of the

stator, this efficiency level is only reached if a copper squirrel cage is used and if the

rotor cross-section is redesigned. However, if the external diameter of the stator is

increased and the rotor and stator cross-sections are redesigned, aluminum rotor

bars and short-circuit rings can be used to reach the IE4 efficiency level.

Abstract [sv]

I detta examensarbete analyseras en 7.5 kW 4-pol induktionsmotor med

verkningsgradsklass IE2 med hjalp av Finita Element Metoden (FEM). Syftet med

arbetet ar att utvardera olika metoder for att oka motorns verkningsgrad och att

foresla designforandringar som kan mojliggora en uppgradering till

verkningsgradsklass IE4.

Forst analyseras och justeras en befintlig modell av motorn som sedan anvands for

att utvardera effekterna av olika designforandringar. Sedan optimeras motorn for att

oka verkningsgraden, detta gors bade med aluminium och med koppar som


Resultaten visar att det ar mojligt att uppna verkningsgradsklassen IE4 genom att

anvanda antingen aluminium eller koppar som rotorledarmaterial. For bada fallen

kravs att motorns langd okas. Da koppar anvands kravs endast en ny

tvarsnittsgeometri for rotorn medan da aluminium anvands behover bade rotor och

statorgeometri andras.

Place, publisher, year, edition, pages
2014. , 79 p.
EES Examensarbete / Master Thesis, XR-EE-E2C 2014:003
Keyword [en]
induction motor, IE4, Super Premium Efficiency
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-160702OAI: diva2:790867
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2015-02-26Bibliographically approved

Open Access in DiVA

fulltext(2283 kB)1339 downloads
File information
File name FULLTEXT01.pdfFile size 2283 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Electrical Energy Conversion
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1339 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 115 hits
ReferencesLink to record
Permanent link

Direct link