Page 133 - Electrician -1st Year - TT

TYo (Power) T«t£ 1.4.41 & 42 dLô] ùRôPo× LÚj§Vp
GXdh¬μVu (Electrician) þ LôkR®Vp Utßm ùLlTô£hPo (Magnetism
and Capacitors)

LôkRfÑtßdLs þ Ru çiPp Utßm TWvTW çiPp ªu]ÝjRm
(The magnetic circuits - self and mutually induced emfs)

úSôdLeLs: ClTôPj§u Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• LôkRÑt±u TReLû[ áßRp (LôkR CVdL ®ûN (M.M.F), LôkRjRûP, LôkRd
úLôÓLs, LôkR APoj§, LôkRl×Xf ùN±Ü (relative permeability)
• ¶vP¬Nvû^l Tt± áßRp.

LôkR CVdL ®ûN (MagnetoMotive Force l
(MMF)): CÚm× úLô¬p HtTPd á¥V LôkR = S
APoj§«u A[Ü ªuú]ôhPm, μ ° μ r a
ÑtßdL°u Gi¦dûL, úLô¬u ¿[m, ARôYÕ,
ÏßdÏ ùYhÓl TWl× Utßm LôkR úLôo S þ LôkRjRûP
ùNnVlThP EúXôLm B¡V IkûRl
ùTôÚjÕ UôßTÓm. A§L ªuú]ôhPm I þ LôkRl TôûR«u ¿[m ÁhP¬p
Utßm A§L ÑtßdLs ùLôiP Lm©ûV μ þ §\kR ùY°«p TW® CÚdÏm
o
Sôm TVuTÓj§]ôp A§LUô] LôkR LôkRjRuûU (Lôt±p) (permeability)
RuûUûV ùT\Xôm. ªu CVdÏ ®ûNûVl
μ þ ùTôÚ°u, LôkRUVUôÏm RuûU
úTôp ÑtßdLû[Ùm ªuú]ôhPjûRÙm r
(relative permeability )
ùTÚd¡]ôp LôkR CVdL ®ûNVôÏm.
MMF = NI ampere-turns a þ LôkRl TôûR«u ÏßdÏ ùYhÓl TWl×
NÕW ÁhPo
ARôYÕ MMF GuTÕ LôkR CVdÏ ®ûN,
AûR Bm©Vo ÑtßdLs A[®p LôkRjRûPûV Bm©VoÑtßdLs/ ùYlTo
ϱl©PlTÓ¡\Õ. Gu\ AX¡p A[dLlTÓ¡\Õ.
N þ úLôo ÁÕ Ñt\lThP Lm© LôkR @l[dv (Magnetic flux): LôkR Ñt±p
ÑtßdL°u Gi¦dûL Es[ LôkRd úL#ôÓLs GuTÕ LôkR úLô¬u
I þ ªuLm©«p ùNÛjÕm ϱdÏ ùYh¥u l[dvþu §ûNdÏ
ªuú]ôhPm, AûR ùNeúLôQj§p CÚdÏm ùUôjR úLôÓL°u
Bm©V¬p ϱdLlTÓ¡\Õ. Gi¦dûLdÏ NUUôÏm. CûR Gu\

200 ÑtßdLs ùLôiP JÚ ªuÑt±p JÚ Ï±«Ûm SI AX¡p ùYlTo Gußm
ϱl©ÓYo.
Bm©Vo ªuú]ôhPm TôÙUô]ôp ARu
LôkR CVdÏ ®ûN 200 Bm©Vo ÑtßdLs NI
BÏm. φ = S
LôkRj RûP(Reluctance): LôkR Ñt±p HtTÓm
LôkR ®ûN (NI)
RûP ªuRûPûVl úTôXúY Jj§ÚlTRôp LôkR úLôÓLs
AûRd LôkRjRûP Gu¡ú\ôm. (AûR S LôkRjRûP (S)
GÝjRôp ϱdLlTÓ¡\Õ). ùUôjRd LôkRd
úLôÓ, LôkRj RûPdÏ G§o ®¡Rj§Ûm NIaμ ° μ r
Utßm LôkR CVdÏ ®ûNdÏ úSo ®¡Rj§Ûm =
l
CÚdÏm. ARû] ¸rdLiPYôß GÝRXôm. ARôYÕ
LôkR CVdÏ
®ûN (NI) NI þ ùUôjRd LôkRd úLôÓLs
LôkR @l[dv φ =
LôkRjRûP (S) S N þ ÑtßdL°u Gi¦dûL
I þ ªuú]ôhPm Bm©V¬p
S þ LôkRj RûP

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