Abstract
Magnetic circuits of electromagnetic energy converters, such as electrical
machines, are nowadays highly utilized. This proposition is intrinsic for
the magnetic as well as the electric circuit and depicts that significant
enhancements of electrical machines are difficult to achieve in the
absence of a detailed understanding of underlying effects. In order to
improve the properties of electrical machines the accurate determination
of the locally distributed iron losses based on idealized model
assumptions solely is not sufficient. Other loss generating effects have
to be considered and the possibility being able to distinguish between the
causes of particular loss components is indispensable. Parasitic loss
mechanisms additionally contributing to the total losses originating from
field harmonics, non-linear material behaviour, rotational magnetizations,
and detrimental effects caused by the manufacturing process or
temperature, are not explicitly considered in the common iron-loss models,
probably even not specifically contained in commonly used calibration
factors. This paper presents a methodology being able to distinguish
between different loss mechanisms and enables to individually consider
particular loss mechanisms in the model of the electric machine. A
sensitivity analysis of the model parameters can be performed to obtain
information about which decisive loss origin for which working point has
to be manipulated by the electromagnetic design or the control of the
machine.
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