core loss

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core loss

[′kȯr ‚lȯs]
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 ?
8m in the first quarter of 2015, compared to a core loss of USD96,000 in the first quarter of 2014.
In this paper, the stray loss resistance is combined into the stator, rotor, and core loss resistances since all of them are unknown.
The incidences of uninterpretable cores because of core loss or nonrepresentation of the tissue in HD- and LDTMAs were compared (Table 2).
Modeling and analysis of permanent magnet synchronous motor by taking saturation and core loss into account Power Electronics and Drive Systems, Rockwell Automation Advanced Technology Labs, 7803-3773-8/97, p.
It has a core loss that is substantially equal in any direction of magnetization in the plane of the material.
Among the companies KBW highlights in its Outperform rating are Axis and XL group for improving their core loss ratios.
These values are based on adjustments of interval lengths to account for approximately 33% core loss.
The stator, rotor and stray losses are proportional to the motor output power square (or pump power) and are covered by the second item on the right hand side of Equation (4) while the core loss stays constant, and is expressed as the third item.
ISO's analysis suggests core loss and loss adjustment expense reserves were deficient by about $28 billion at year-end 2004.
Cable & Wireless yesterday said it would cut its UK workforce by nearly 30 per cent over the next two years in an attempt to turn its core loss making telecoms business around.
In addition to erosion testing, core weight, core loss on ignition (LOI), the time to core breakdown (BCIRA) and tensile profiles also were tested for each of the 16 mixes to ensure core properties could be maintained.