core loss


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core loss

[′kȯr ‚lȯs]
(electromagnetism)
The rate of energy conversion into heat in a magnetic material due to the presence of an alternating or pulsating magnetic field. Also known as excitation loss; iron loss.

Core loss

The rate of energy conversion into heat in a magnetic material due to the presence of an alternating or pulsating magnetic field. It may be subdivided into two principal components, hysteresis loss and eddy-current loss. See Eddy current

The energy consumed in magnetizing and demagnetizing magnetic material is called the hysteresis loss. It is proportional to the frequency and to the area inside the hysteresis loop for the material used. Most rotating machines are stacked with silicon steel laminations, which have low hysteresis losses. The cores of large units are sometimes built up with cold-reduced, grain-oriented, silicon iron punchings having exceptionally low hysteresis loss, as well as high permeability when magnetized along the direction of rolling.

Induced currents flow within the magnetic material because of variations in the flux; this is called eddy-current loss. For 60-cycle rotating machines, core laminations of 0.014–0.018 in. (0.35–0.45 mm) are usually used to reduce this eddy-current loss. See Electric rotating machinery

References in periodicals archive ?
Table 2 shows a summary of the input and output variables were presented, along with performance where notable improvement is done by decreasing the core loss zone avoiding saturation, which leads to a decrease in the input current and thus also reducing Joule losses.
In this paper, the stray loss resistance is combined into the stator, rotor, and core loss resistances since all of them are unknown.
These loss constants were used to obtain the core loss at various excitation frequencies in the FE model of the CW IPM machine.
The incidences of uninterpretable cores because of core loss or nonrepresentation of the tissue in HD- and LDTMAs were compared (Table 2).
The power losses consist of the core loss occurring in the iron yokes and the copper loss occurring in the armature windings.
Optimized core cross section lowers core loss while PCB construction minimizes Cu loss.
ECDD002 has some zones of significant core loss within the mineralized interval and a three metre zone of no sample within this zone has been assigned zero grade for the average calculation.
The total power loss includes that of the control IC, the core loss, and the [I.
For advancement sensorless control is necessary model of PMSM extend about core loss.
AC core loss is low in Hiperco 50 and medium in HS-50.