Design of salient pole PM synchronous machines for a vehicle traction application – Analysis and
Rilla, Marko (2012-12-08)
Väitöskirja
Rilla, Marko
08.12.2012
Lappeenranta University of Technology
Acta Universitatis Lappeenrantaensis
Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:978-952-265-337-6
https://urn.fi/URN:ISBN:978-952-265-337-6
Tiivistelmä
This doctoral thesis presents a study on the development of a liquid-cooled frame salient pole
permanent-magnet-exited traction machine for a four-wheel-driven electric car. The emphasis of
the thesis is put on a radial flux machine design in order to achieve a light-weight machine
structure for traction applications. The design features combine electromagnetic and thermal
design methods, because traction machine operation does not have a strict operating point.
Arbitrary load cycles and the flexible supply require special attention in the design process.
It is shown that accurate modelling of the machine magnetic state is essential for high-performance
operation. The saturation effect related to the cross-saturation has to be taken carefully into
account in order to achieve the desired operation.
Two prototype machines have been designed and built for testing: one totally enclosed machine
with a special magnet module pole arrangement and another through-ventilated machine with a
more traditional embedded magnet structure. Both structures are built with magnetically salient
structures in order to increase the torque production capability with the reluctance torque
component. Both machine structures show potential for traction usage. However, the traditional
embedded magnet design turns out to be mechanically the more secure one of these two machine
options.
permanent-magnet-exited traction machine for a four-wheel-driven electric car. The emphasis of
the thesis is put on a radial flux machine design in order to achieve a light-weight machine
structure for traction applications. The design features combine electromagnetic and thermal
design methods, because traction machine operation does not have a strict operating point.
Arbitrary load cycles and the flexible supply require special attention in the design process.
It is shown that accurate modelling of the machine magnetic state is essential for high-performance
operation. The saturation effect related to the cross-saturation has to be taken carefully into
account in order to achieve the desired operation.
Two prototype machines have been designed and built for testing: one totally enclosed machine
with a special magnet module pole arrangement and another through-ventilated machine with a
more traditional embedded magnet structure. Both structures are built with magnetically salient
structures in order to increase the torque production capability with the reluctance torque
component. Both machine structures show potential for traction usage. However, the traditional
embedded magnet design turns out to be mechanically the more secure one of these two machine
options.
Kokoelmat
- Väitöskirjat [1037]