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Grauers, A. och Kasinathan, P. (2004) *Force density limits in low-speed PM machines due to temperature and reactance *.

** BibTeX **

@article{

Grauers2004,

author={Grauers, Anders and Kasinathan, Prakashraj},

title={Force density limits in low-speed PM machines due to temperature and reactance },

journal={IEEE transactions on energy conversion},

issn={0885-8969},

volume={19},

issue={3},

pages={518-525},

abstract={This paper discusses two of the mechanisms that limit
the attainable force density in slotted low-speed permanent-magnet
(PM) electric machines. Most of the interest is focused on the force
density limits imposed by heating of the windings and by stator reactance.
The study is based on analytical models for the force and
reactance calculations and a lumped parameter thermal model. It
is found that in a machine with an indirectly cooled stator, it is difficult
to achieve a force density greater than 100kN m
2 due to temperature
limits. A high force density is achieved by using deep slots,
which lead to high reactance. The high reactance severely increases
the converter kilovolt-ampere requirement and total system cost. It
is also shown that the cost caused by the high reactance will also
limit the force density reached. In machines with one slot per pole
per phase, the reactance limited the useful slot depth to approximately
200 mm. However, in machines having a greater number of
slots per pole per phase the reactance becomes no longer an important
limiting factor for the slot depth and force density.},

year={2004},

keywords={Electric machines, force density, high torque, inductance, low speed, permanent magnet, reactance, thermal limits},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 206000

A1 Grauers, Anders

A1 Kasinathan, Prakashraj

T1 Force density limits in low-speed PM machines due to temperature and reactance

YR 2004

JF IEEE transactions on energy conversion

SN 0885-8969

VO 19

IS 3

SP 518

OP 525

AB This paper discusses two of the mechanisms that limit
the attainable force density in slotted low-speed permanent-magnet
(PM) electric machines. Most of the interest is focused on the force
density limits imposed by heating of the windings and by stator reactance.
The study is based on analytical models for the force and
reactance calculations and a lumped parameter thermal model. It
is found that in a machine with an indirectly cooled stator, it is difficult
to achieve a force density greater than 100kN m
2 due to temperature
limits. A high force density is achieved by using deep slots,
which lead to high reactance. The high reactance severely increases
the converter kilovolt-ampere requirement and total system cost. It
is also shown that the cost caused by the high reactance will also
limit the force density reached. In machines with one slot per pole
per phase, the reactance limited the useful slot depth to approximately
200 mm. However, in machines having a greater number of
slots per pole per phase the reactance becomes no longer an important
limiting factor for the slot depth and force density.

LA eng

LK http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1325289

OL 30