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Glossary - E |
Eddy current
Eddy current loss
Electric angle
Electromagnet
ELF meter
ELF field
Energy density (B·H)
Eddy current
Current induced in a conductive material by a variation of magnetic flux in the material. Generally they are undesirable, both because of the power losses and of the shielding effects on variable magnetic fields.
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Eddy current loss
The portion of core loss due to currents circulating in the magnetic material, as a resultant electromotive forces induced by varying induction.
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Electric angle
In the electric motor terminology, concerning the cross section of a circular machine with p couple of pole, the mechanical angle α corresponds to an electric angle ß
ß = α • p
(In a 4 poles motor, 45 geometric degrees correspond to 2 x 45 = 90 electric degrees
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Electromagnet
Magnet consisting of a solenoid with iron core, which has a magnetic field existing only during the time of current flow through the coil.
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ELF meter
Instrument to measure ELF magnetic field. It displays directly the rms value of magnetic field. Commonly used to measure field levels at 50-60 Hz.
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ELF field
Extremely Low Frequency electromagnetic field (frequency below 3000 Hz).
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Energy density (B·H)
Product of the magnetic induction B and the field strength H. The SI unit is J/m3. It is represented as a drawn rectangle under the demagnetisation curve. See also (B·H)max value.
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