There are two types of Losses in an Electrical Machine. Core Loss and Copper Loss. Core Loss are classified into two types:
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Eddy current losses in a metal
body, due to the eddy currents flowing through it, induced by an alternating
magnetic field.
Hysteresis loss in form of
heat when magnetisation of the material is made to exchange with respect to
time.
This is the formula
of eddy current loss.
This is the
formula of hysteresis loss.
Eddy
current losses occur because of the relative motion between the core and the
magnetic flux.
Hysteresis
losses which occur because of the reversal of the magnetism is known as the
hysteresis loss.
The eddy current loss is minimized by using
the thin core of lamination.
Hysteresis loss is minimized by the silicon
steel.