What is hysteresis losses?

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What is hysteresis losses?..

Hysteresis loss is a heat loss caused by the magnetic
properties of the armature. When an armature core is in a
magnetic field, the magnetic particles of the core tend to
line up with the magnetic field. When the armature core is
rotating, its magnetic field keeps changing direction. The
continuous movement of the magnetic particles, as they try
to align themselves with the magnetic field, produces
molecular friction. This, in turn, produces heat. This heat
is transmitted to the armature windings. The heat causes
armature resistances to increase.

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What is hysteresis losses?..

Answer / rajesh

experiment:

take a iron rod which is copper wire is wounded around
it.when the current is passed through it ,it acts like a magnet.
suppose a dc regulated supply is given,
give a supply of 1 amp let it has some 1 henry
increase the supply
to 2 amp let it has some 2 henry
increase the supply
to 3 amp let it has some 3 henry

now decrease the supply
to 2 amp what we think is it should has 2henry but it don't
it decreases slightly to 1.8

This says that when sinusoidal is given to a machine,
positive half consists of 2 equal values in which the
magnetic strength wont be equal.

this leads to some loss..........