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**Harvard**

Åström, J. (2004) *Measurement of loss components in two induction machines and three types of frequency converters*. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Åström2004,

author={Åström, Johan},

title={Measurement of loss components in two induction machines and three types of frequency converters},

abstract={This report presents the results obtained from measurements on two induction
machines (IMs) fed by three different types of frequency converters; the focus has
been on determining the different loss components of the drive system and how these
varies with the frequency at different operating points.
The mechanical power output was measured with a torque transducer and for
determining the electric power a six-channel power analyzer was used. The main
conclusion is that the method used gave good results; it managed to explain nearly all
the losses in the induction machine. The part of the losses not accounted for was 13%
in the worst case, which can represet the stray losses. Furthermore, it was established
how the different loss components varied with frequency and load; it was found that
the overall losses decreased with increasing frequency for all load situations
An investigation of three field measurement methods was also preformed; the slip
method, the current method and the air gap torque method were considered. The two
first methods gave unsatisfying result. The air gap torque method gave a result very
close to the measured output power. The estimated efficiency of the two methods
varied with a maximum of 3.7% and this variation became less than 0.5% at loads
above 0.5 p.u output power.},

publisher={Institutionen för elteknik, Chalmers tekniska högskola},

place={Göteborg},

year={2004},

note={84},

}

** RefWorks **

RT Generic

SR Electronic

ID 174350

A1 Åström, Johan

T1 Measurement of loss components in two induction machines and three types of frequency converters

YR 2004

AB This report presents the results obtained from measurements on two induction
machines (IMs) fed by three different types of frequency converters; the focus has
been on determining the different loss components of the drive system and how these
varies with the frequency at different operating points.
The mechanical power output was measured with a torque transducer and for
determining the electric power a six-channel power analyzer was used. The main
conclusion is that the method used gave good results; it managed to explain nearly all
the losses in the induction machine. The part of the losses not accounted for was 13%
in the worst case, which can represet the stray losses. Furthermore, it was established
how the different loss components varied with frequency and load; it was found that
the overall losses decreased with increasing frequency for all load situations
An investigation of three field measurement methods was also preformed; the slip
method, the current method and the air gap torque method were considered. The two
first methods gave unsatisfying result. The air gap torque method gave a result very
close to the measured output power. The estimated efficiency of the two methods
varied with a maximum of 3.7% and this variation became less than 0.5% at loads
above 0.5 p.u output power.

PB Institutionen för elteknik, Chalmers tekniska högskola,

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/174350/174350.pdf

OL 30