Page 135 - Electrician -1st Year - TT

ªu LôkRj§u TVuLs þ ªuLôkRj çiPp (Electromagnet applications -
Electromagnetic induction)

úSôdLeLs: ClTôPj§u Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• LôkR Ñtß Utßm ªuÑtß CWiûPÙm Jl©ÓRp
• ªu LôkRj§u TVuLs (ùTp, TvNo, ¥ëlûXh úNôd)
• ªu LôkR çiPp ®§Ls Utßm RjÕYjûR ®Y¬jRp
• G§o®û] ªu]ÝjRm (counter EMF) þ ªuçiPp G§o®û] (induced reactance) þúSW
¨ûXlTôÓ (time constant) ϱjÕ ®[dÏRp.

LôkRfÑtßdÏm ªuÑtßdÏm CûPúVÙs[ Jl×úSôdÏl Th¥Vp (Fig 1a &1b)

LôkR CVdL
®ûN ªu]ÝjRm
1 @l[dv = ªuú]ôhPm =
LôkRjRûP ªuRûP

2 LôkR CVdL ®ûN (Bm©Vo Ñtß) ªu CVdÏ ®ûN (úYôph) (E.M.F.) (Volts)
(M.M.F.) (Ampere-turns)
3 @l[dv (ùYTo) (Flux ) (Webers) ªuú]ôhPm I (Bm©Vo) (Current I (amperes))
2
4 LôkRf ùN±Ü (B (Wb/m ) ) ªu APoj§ (A/m )
2
5 LôkRjRûP ªuRûP

6 ùToU]uv (Permeance) (1/LôkRjRûP) LPjÕm RuûU (Conductance) (1/ªuRûP)
7 LôkR RûPj RuûU (Reluctivity) (μ μ A) RÓlTôt\p (Resistivity)
o r
8 ùToªV©Xõh¥ (1/LôkRRûPjRuûU) LuPd¥®h¥ (1/ùW£v¥®h¥)
Permeability (=1/reluctivity) Conductivity(=1/resistivity)

SûPØû\«p TVuTÓjÕ¡u\ ªu ªuLôkR çiPp RjÕYm Utßm
LôkReLs (Practical applications of ®§Ls (Principles and laws of electromagnetic
electromagnets): ªuLôkReLs TX ®RUô] induction) : JÚ ªuLPj§«p UôߧûN
ªu CVk§WeL°p TVuTÓ¡\Õ. ARôYÕ ªuú]ôhPm ùNpÛm úTôÕ TôWúP«u
úUôhPôoLs, ù_]úWhPoLs, ªu LôkR çiPp ®§ ARtÏ ùTôÚkÕm.
¥Wôuv@TôoUoLs, LuYoPoLs, ªu
TôWúP«u ªuLôkR çiPp ®§
A[ÜLû[ A[dÏm ÁhPoLs, BTjûR
(Faradays’ Laws of Electromagnetic Induction))
R®odÏm ¬úX, UÚjÕY TVuLÞdÏ
LiL°XõÚkÕ CÚm× (ÕLsLû[, TôWúP«u ØRp ®§ (Faraday’s First Law):
©£ßLû[ ¿dÏYRtÏ) Utßm ªuNôWU¦, LôkRd úLôÓLû[ LPj§ ùYhÓYRôúXô,
ùTp, Tv^o, ªuÑtß Õi¥lTôu, ¬úX, LPj§ûVf Ñt±Ùs[ LôkRd úLôÓLs ARu
ùPXõ¡Wô©d ÑtßLs, ªu EVoj§Ls (lift) U§l©Ûm §ûN«Ûm UôßRp AûPkRôúXô
Utßm TX T¦Uû] TVuLÞdÏl LPj§«p ªu CVdÏ®ûN çiPlTÓ¡\Õ.
TVuTÓ¡\Õ. TôWúP«u CWiPôYÕ ®§ (The Second
a ùTp b Tv^o Law): LPj§«p çiPlTÓm ªu CVdÏ
®ûN ϱl©hP úSWj§p LPj§«u úUp
c Nodëh ©úWdLo d ¬úX
HtTÓm LôkRd úLôÓL°u UôßTôh¥u
e Rk§ ªuÑtß f Xõlh A[®tÏ úSo ®¡Rj§p CÚd¡\Õ.

g ùRô¯XL TVuTôÓ ûP]ªd ªu]ÝjRm (Dynamically Induced
EMF) : úUtLiP ®§Øû\dúLtT çiPl
TÓm ªu]ÝjRUô]Õ JÚ ¨ûXVô]

TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.4.41 - 42 115