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**Harvard**

Anderssson, B. (2013) *Lumped Parameter Thermal Modelling of Electric Machines *. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Anderssson2013,

author={Anderssson, Björn},

title={Lumped Parameter Thermal Modelling of Electric Machines },

abstract={Two thermal resistance network models have been developed for the
steady state radial heat
ow an experimental IPMSM. The models
have been based on published material, but also on some case studies
with the purpose of determining the best choice of methods for certain
situations. In one case study on hollow cylinders, it is concluded that
it is favourable to place nodes with heat sources representing evenly
distributed losses in a point corresponding to the mean radius of the
object, rather than the resistive midpoint. Furthermore it is investigated
whether the accuracy of a thermal resistance network model can
be improved by increasing the resolution of the node configuration.
The result indicates that so is the case, although with some ambiguity.
The increased complexity of the high resolution network makes it more
bulky however, which is a disadvantage compared to the low resolution
node configurations.
The two network models are used to analyse the IPMSM, and compared
with a FEM model made in ANSYS Mechanical. A number of
parameters are swept to investigate the machines dependency on some
thermally important design characteristics, and also the sensitivity to
errors from uncertain input data, geometry approximations, and other
estimations. Such uncertain parameters are e.g. the interface gaps
between machine components, the turbulence model in the air gap,
and the thermal model of the slots. Regarding the design aspects, it
is suggested to strive towards minimising the contact gaps during the
assembly, and consider the choice of materials used in the stator slots.},

publisher={Institutionen för energi och miljö, Chalmers tekniska högskola},

place={Göteborg},

year={2013},

keywords={Thermal Modelling, PMSM, Electric Machines, Thermal Resistance Network, FEM},

note={72},

}

** RefWorks **

RT Generic

SR Electronic

ID 185192

A1 Anderssson, Björn

T1 Lumped Parameter Thermal Modelling of Electric Machines

YR 2013

AB Two thermal resistance network models have been developed for the
steady state radial heat
ow an experimental IPMSM. The models
have been based on published material, but also on some case studies
with the purpose of determining the best choice of methods for certain
situations. In one case study on hollow cylinders, it is concluded that
it is favourable to place nodes with heat sources representing evenly
distributed losses in a point corresponding to the mean radius of the
object, rather than the resistive midpoint. Furthermore it is investigated
whether the accuracy of a thermal resistance network model can
be improved by increasing the resolution of the node configuration.
The result indicates that so is the case, although with some ambiguity.
The increased complexity of the high resolution network makes it more
bulky however, which is a disadvantage compared to the low resolution
node configurations.
The two network models are used to analyse the IPMSM, and compared
with a FEM model made in ANSYS Mechanical. A number of
parameters are swept to investigate the machines dependency on some
thermally important design characteristics, and also the sensitivity to
errors from uncertain input data, geometry approximations, and other
estimations. Such uncertain parameters are e.g. the interface gaps
between machine components, the turbulence model in the air gap,
and the thermal model of the slots. Regarding the design aspects, it
is suggested to strive towards minimising the contact gaps during the
assembly, and consider the choice of materials used in the stator slots.

PB Institutionen för energi och miljö, Chalmers tekniska högskola,

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/185192/185192.pdf

OL 30