2017.01.18 magnetisme v76 300 b
TRANSCRIPT
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H
Magnetisk feltstyrke Ampere per meter (A/m)
2017.01.23
MAGNETISME
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STØRRELSESSYMBOLER FOR MAGNETISME:.
Φ = Magnetisk fluks (phi) målt i Weber (Wb)B = Magnetisk flukstetthet målt i Tesla (T)H = Magnetisk feltstyrke målt i ampere per meter (A/m)L = Induktans (selvinduktans) i spole, målt i henry (H)Rm = Reluktans, magnetisk resistans målt i 1/Henry (1/H)Λ = Permeans (lamda) magnetisk ledningsevne målt i henry (H)
μ0 = Permeabilitetskonstant for vakuum i henry per meter (H/m)
μr = Relativ permeabilitet (ubenevnt, se verdier i tabell)
μ = μ0 · μr = Permeabilitet målt i henry per meter (H/m)
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STØRRELSESSYMBOLER FOR MAGNETISME:.
= Magnetisk feltstyrke, målt i ampere per meter (A/m)
H
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Side 66
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Side 66
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Magnetomotorisk spenning Fm og magnetisk feltstyrke H
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Spørsmål ?
Spørsmål ?
Spørsmål ?
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Øving !
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Oppgave Kap 5, 3c)
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Side 81
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=
Vi må få alene på den ene siden av likningen !
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=
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= = 20 A/m= 20mA = 20 · 10-3 A = 10 cm = 0,1m
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= = 20 A/m= 20mA = 20 · 10-3 A = 10 cm = 0,1m
= 20 A/m = 100
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Spørsmål ?
Spørsmål ?
Spørsmål ?
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Øving !
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Oppgave Kap 5, 3d)
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Side 81
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Side 66
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B = μ·H = μ
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Magnetisk flukstetthet B = μ·H
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Magnetisk flukstetthet B = μ·H
= 1,257 10-6 H/m · 20 A/m
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Magnetisk flukstetthet B = μ·H
= 1,257 10-6 H/m · 20 A/m= 25,14 μT
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Spørsmål ?
Spørsmål ?
Spørsmål ?
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Øving !
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Oppgave Kap 5, 3e)
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Side 81
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Magnetisk fluks Φ.
Φ = B · A Φ = Magnetisk fluks målt i weber (Wb)
B = Magnetisk flukstetthet målt i tesla (T)
A = Areal målt i kvadratmeter (m2 )
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Φ = B · A Magnetisk fluks Φ
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Φ = B · A Magnetisk fluks Φ
B = μ·H = 1,257 10-6 H/m · 20 A/m = 25,14 μT
Spolediameteren er 1 cm = 0,01m
Spoleradien = d/2 = 0,005m = 5 ·10-3 m
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Φ = B · A Magnetisk fluks Φ
B = 25,14 μTr = 5 ·10-3 m
Φ = B · A = B · π · r2 = = 25,14 μT · 3,14 · (5 ·10-3 m ) 2 = 1,97nWb
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Spørsmål ?
Spørsmål ?
Spørsmål ?
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www.padlet.com
www.padlet.com
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ransformator-prinsippet
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Når strømmen er av eller på, induseres ikke spenning til den andre spolen.
Magnetfeltet endrer seg ikke ved lik strøm.
Da er det ingen endring av den magnetiske fluksen.
Ved endring av strømmen, induseres spenning til den andre spolen.
Magnetfeltet endrer seg ved endring av strømmen.
Den magnetiske fluksen endrer seg ved endring av strømmen.
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Lenz lov:
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Lenz' lov sier at en indusert strøm har en slik retning at de kreftene som oppstår vil motvirke inngrepet som induserer strømmen.
Lenz' lov er helt sentral innenfor elektromagnetisk induksjon, og gir opphavet til minusfortegnet i Faradays lov. Lenz' lov ble formulert av fysikeren Emil Lenz i 1834
https://no.wikipedia.org/wiki/Lenz'_lov
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Side 71
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Spørsmål ?
Spørsmål ?
Spørsmål ?
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L
Henry (H)
Induktans
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STØRRELSESSYMBOLER FOR MAGNETISME:.
Φ = Magnetisk fluks (phi) målt i Weber (Wb)B = Magnetisk flukstetthet målt i Tesla (T)H = Magnetisk feltstyrke målt i ampere per meter (A/m)L = Induktans (selvinduktans) i spole, målt i henry (H)Rm = Reluktans, magnetisk resistans målt i 1/Henry (1/H)Λ = Permeans (lamda) magnetisk ledningsevne målt i henry (H)
μ0 = Permeabilitetskonstant for vakuum i henry per meter (H/m)
μr = Relativ permeabilitet (ubenevnt, se verdier i tabell)
μ = μ0 · μr = Permeabilitet målt i henry per meter (H/m)
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STØRRELSESSYMBOLER FOR MAGNETISME:.
= Induktans (selvinduktans) i spole, målt i henry ()
L
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Hva forteller induktansverdien L om en spole ?
Er induktansen konstant eller endrer den seg med strømstyrken ?
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Induktans for spole: Induktans sier noe om spolens evne til å oppta energi og evnen til å motvirke strømendringer.
Induktansen er en konstant for hver enkelt spole.
Energien opptatt i en spole er kinetisk energi.
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Side 71
lANL 2
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Dette fører til mindre induktans i en spole:
Dette fører til større induktans i en spole:
Side 72
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Dette fører til mindre induktans i en spole:
Dette fører til større induktans i en spole:
Side 72
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Dette fører til mindre induktans i en spole:
Dette fører til større induktans i en spole:
Side 72
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Dette fører til mindre induktans i en spole:
Dette fører til større induktans i en spole:
Side 72
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Side 72e: elektromotorisk spenning
To forhold påvirker størrelsen på e: Induktansen og ΔI
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Side 72
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Side 72
Definisjon av måleenheten henry (H):
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Side 73
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Side 73
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Diode som lader ut spolen, når denne mister strømmen når transistoren stenger. Overspenningen som bygges opp må ha en plass å gjøre av seg for ikke å ødelegge transistoren.
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Side 73
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Induktans for spole:For en sylindrisk, jevnt viklet spole gjelder tilnærmelsesvis denne formelen:
lANL 2
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L = Induktivitet eller induktans i [H = Henry]μ0 = absolutt permeabilitet (4·π·10−7 [H/m])μr = relativ permeabilitet til materialet i kjernen.
For vakuum er verdien lik 1, og den er ikke så mye forskjellig for de fleste andre materialer somikke er ferromagnetiske.
N = antall vindinger (uten benevning)A = Arealet til kjernen [m2]l = lengden til spolen i [m].
lANL 2
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Side 73
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Øving !
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Oppgaver InduktansL Henry (H)
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Disse to spolene seriekobles, hva blir den totale induktansen ?
= 10mH = 90mH
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Disse to spolene seriekobles, hva blir den totale induktansen ?
1= 10mH 2= 90mH
SERIE =1 + 2= 100mH
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Legg merke til at ved seriekobling av spoler som ikke virker magnetisk inn på hverandre, så er den totale induktansen STØRRE enn den største enkeltinduktansen i kretsen !
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Disse to spolene kobles i parallell, hva blir den totale induktansen ?
1= 10mH 2= 90mH
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= +
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=𝟏
𝟏L1
+ 𝟏L2
𝟏𝟏
𝟏𝟎𝒎𝑯 + 𝟏90mH
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=𝟏
𝟏𝟏𝟎𝒎𝑯 + 𝟏
90mH9 mH
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Legg merke til at ved parallellkobling av spoler som ikke virker magnetisk inn på hverandre, så er den totale induktansen MINDRE enn den minste enkeltinduktansen i kretsen !
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Oppgave:2 stk spoler med hver på induktansen 100mH er seriekoblet, hva er seriekoblingens induktans ?
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Oppgave: Vise utregning !2 stk spoler med hver på induktansen 100mH er seriekoblet, hva er seriekoblingens induktans ?
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Oppgave:2 stk spoler med hver på induktansen 100mH er seriekoblet, hva er seriekoblingens induktans ?
LTOTAL = L1 + L2 =100mH + 100mH = 200 mH
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Oppgave:2 stk spoler med hver på induktansen 100mH er parallellkoblet, hva er parallellkoblingens induktans ?
![Page 94: 2017.01.18 magnetisme v76 300 b](https://reader033.vdocuments.net/reader033/viewer/2022052514/5885f32b1a28ab864f8b631f/html5/thumbnails/94.jpg)
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Oppgave:2 stk spoler med hver på induktansen 100mH er parallellkoblet, hva er parallellkoblingens induktans ?
![Page 96: 2017.01.18 magnetisme v76 300 b](https://reader033.vdocuments.net/reader033/viewer/2022052514/5885f32b1a28ab864f8b631f/html5/thumbnails/96.jpg)
Oppgave: Vise brøkregning: Metode 12 stk kondensatorer med hver på kapasitansen 100μF er seriekoblet, hva er seriekoblingens kapasitans ?
= + L TOTAL =
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Oppgave: Vise brøkregning: Metode 22 stk kondensatorer med hver på kapasitansen 100μF er seriekoblet, hva er seriekoblingens kapasitans ?
= + L TOTAL =
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Oppgave: Vise utregning !2 stk spoler med hver på induktansen 100mH er parallellkoblet, hva er parallellkoblingens induktans ?
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Oppgave:2 stk spoler med hver på induktansen 100mH er parallellkoblet, hva er parallellkoblingens induktans ?
= +
L TOTAL =
L TOTAL = mH = 50mH
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Oppgave 6: TIPS !2 stk spoler med hver på induktansen 100mH er parallellkoblet, hva er parallellkoblingens induktans ?
L TOTAL = mH = 50mH
NÅR FLERE SPOLER ER PARALLELLKOBLET, VIL DEN TOTALE INDUKTANSEN TIL KRETSEN ALLTID VÆRE MINDRE ENN INDUKTANSEN TIL DEN MINSTE SPOLEN !
SLIK KAN DU SJEKKE SVARET !
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Spørsmål ?
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