Eddy currents are loops of electrical current induced
within conductors by a changing magnetic field in the conductor
according to Faraday's law of induction. Eddy currents flow in closed loops
within conductors, in planes perpendicular to the magnetic field.
How are Eddy Currents Created?
They are induced by changing magnetic fields and flow in closed loops,
perpendicular to the plane of the magnetic field. They can be created when a
conductor is moving through a magnetic field, or when the magnetic field
surrounding a stationary conductor is varying i.e. anything which results in the
conductor experiencing a change in the intensity or direction of a magnetic
field can produce eddy currents.
Factors Influencing the Size of Eddy Currents
The size of the eddy current is proportional to the size of the magnetic
field, the area of the loop and the rate of change of magnetic flux, and
inversely proportional to the resistivity of the conductor.
Everyday applications where we benefit from Eddy currents
examples include electromagnetic braking, metal detectors, aluminum can
separation non-destructive testing,
Identification of metals , proximity and displacement sensors detection of coins
in vending machines and also for measurements of coating thickness.
Mzunguko wa Eddy ni mzunguko wa umeme unaotokana na mabadiliko ya uwanja wa sumaku ndani ya kondakta kulingana na sheria ya Faraday ya induction. Mtiririko wa Eddy hutiririka katika vifungo vilivyofungwa ndani ya conductors, katika ndege perpendicular kwa uwanja wa sumaku. Mtiririko wa Eddy Unatokezwaje? Wao ni induced na kubadilisha mashamba ya sumaku na mtiririko katika loops imefungwa, perpendicular kwa ndege ya uwanja wa sumaku. Inaweza kuundwa wakati conductor ni kusonga kwa njia ya uwanja wa sumaku, au wakati uwanja wa sumaku kuzunguka conductor stationary ni kutofautiana yaani. Kwa sababu ya hali hii, mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo wa mwongozo. Kiasi cha Eddy Current ni sawa na ukubwa wa uwanja wa sumaku, eneo la kitanzi, na kiwango cha mabadiliko ya flux ya sumaku, na inversely sawa na upinzani wa conductor. Matumizi ya kila siku ambapo tunanufaika na mifumo ya Eddy ni pamoja na braking electromagnetic, detectors chuma, alumini inaweza kutenganisha majaribio yasiyo ya uharibifu, utambulisho wa metali, ukaribu na displacement sensors, utambulisho wa sarafu katika mashine za kuuza na pia kwa ajili ya vipimo vya unene wa mipako.