8/19/2019 MAGNETIC AMPLIFIER-final.pptx
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WELCOME
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MAGNETIC AMPLIFIER
Submitted by:-
DharmendraChaurasia
1109131037
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Contents
Introdution!istory
"m#$i%er
Ma&neti am#$i%er
Saturab$e reator
'rini#a$ o( ma&neti am#$i%er
Wor)in& o( ma&neti am#$i%er
"##$iation* stren&th + $imitation ,ses in radio* airra(t + om#utin&
Con$usion
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I./OD,C.IO
1"n e$etroma&neti deie (or am#$i(yin&e$etria$ si&na$
2 " ma&neti am#$i%er uses the #rini#$e o(
trans(ormers a$on& ith the one#t o(ma&neti saturation o( the ore
3Does not re4uire any moeab$e #art
5 .he ma&neti am#$i%er has ertain
adanta&es oer :-
a6!i&h eieny
b6/e$iabi$ity
6/u&&edness
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!IS.O/8
1 Dee$o#ed as ear$y as 1 in unitedstate
2 "t that time main$y used (or e$etrimahinery and theater $i&htin&
3 Durin& or$d ar II ;ermans used it
in $on& ran&e ro)ets to re&u$ate(re4ueny out#ut o( an a &enerator
5 Ear$y time its uses as ear$ydee$o#ment o( oie transmission byradio
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"m#$i%er
1 "n e$etroni am#$i%er is an e$etroni
deie that inreases the #oer o( a si&na$2 It does this by ta)in& ener&y (rom a #oer
su##$y and ontro$$in& the out#ut to maththe in#ut si&na$ sha#e but ith a $ar&er
am#$itude
3 "n am#$i%er modu$ates the out#ut o( the#oer su##$y
5 .here are (our basi ty#es o( e$etroniam#$i%er:-
a6 =o$ta&e am#$i%er b6Currentam#$i%er
6.rans-ondutane am#$i%er
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Ma&neti am#$i%er
.he ma&neti am#$i%er is an
e$etroma&neti deie (or am#$i(yin&e$etria$ si&na$s
.he ma&neti am#$i%er as inentedear$y in the 20th entury
It as used as an a$ternatie to auumtube am#$i%ers here robustness andhi&h urrent a#aity ere re4uired
In Wor$d War-2 ;ermany used this ty#e o(am#$i%er* and it as used (or instane inthe =-2 ro)et
.he ma&neti am#$i%er as most#rominent in #oer ontro$ and $o-
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.he saturab$e reator
.he saturab$e reator is the deie (romhih
the ma&neti am#$i%er has been
(undamenta$$y dee$o#ed
.he three essentia$ e$ements o( saturab$e
reator are:-
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.he saturab$e reator
>ontinued?6
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'rini#a$ o( ma&neti am#$i%er
1 " ma&-am# deie may $oo) $i)e a
transformer but the o#eratin& #rini#$eis 4uite di@erent (rom a trans(ormer -essentia$$y the ma&-am# is a saturablereactor
2 It ma)es use o( ma&neti saturation o(the ore
3 Aor ontro$$ed saturationharateristis* the ma&neti am#$i%er
em#$oys ore materia$s hih hae a
s#ei% B-! ure sha#e that is hi&h$yretan&u$ar* in ontrast to the s$o$y-ta#erin& B-! ure o( so(t$y saturatin&ore materia$s that are o(ten used in
norma$ trans(ormers
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Wor)in&1.he ty#ia$ ma&neti am#$i%er onsists o( to #hysia$$y
se#arate but simi$ar trans(ormer ma&neti ores eah o(hih has to indin&s - a ontro$ indin& and an "Cindin&
2 " sma$$ DC urrent (rom a $o im#edane soure is (ed
into the series-onneted ontro$ indin&s .he "Cindin&s may be onneted either in series or in #ara$$e$*the on%&urations resu$tin& in di@erent ty#es o( ma&am#s
3.he amount o( ontro$ urrent (ed into the ontro$
indin& sets the #oint in the "C indin& ae(orm athih either ore i$$ saturate In saturation* the "Cindin& on the saturated ore i$$ &o (rom a hi&him#edane state >o@6 into a ery $o im#edane state
>on6 - that is* the ontro$ urrent ontro$s at hiho$ta&e the ma& am# sithes on
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.he ty#ia$ ma&neti am#$i%er iruit
shon aboe has the (o$$oin&om#onents:1.R1 - $oad resistane2.G - &ate indin&
3.C - ontro$ indin&4.Ec - eitation.Es - in#ut (rom "C soure!.Is - am#$i%ed "C urrent
".Ic - ontro$ DC urrent
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"##$iation
As modulation and control amplifiers in the early
development of voice transmission by radio. As voice modulator and magnetic amplifiers were used
in the keying circuits of large high-frequency
alternators used for radio communications.
Magnetic amplifier is useful for control of lighting
circuits, for stage lighting and for advertising signs.
Saturable reactor amplifiers were used for control of
power to industrial furnaces.
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,sa&e inom#utin&
Magnetic amplifiers were widely studied duringthe 1!"s as a potential switching element for
mainframe computers.
Mag amps could be used to sum several inputs in a
single core, which was very useful in the
arithmetic logic unit #A$%&.
'he mag amp was able to combine the advantages
of tubes and transistors in an era when the latter
were e(pensive and unreliable.
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Stren&th
A static device with no moving parts.
)as a good tolerance to mechanical shock and vibration.
*t requires no warm-up time.
Multiple isolated signals may be summed by additionalcontrol windings on the magnetic cores.
'he magnetic amplifier is also used as a transducer in
applications such as current measurement and the flu(
gate compass.
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Limitations
'he gain available from a single stage is limited and low
compared to electronic amplifiers.
Solid-state amplifiers can be more compact and efficient
than magnetic amplifiers. 'he bias and feedback windings are not unilateral, and
may couple energy back from the controlled circuit into
the control circuit. 'his complicates the design of multistage amplifiers
when compared with electronic devices.
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Con$usion "$thou&h* ma&neti am#$i%er is anoutdated
tehno$o&y in #resent trend* It is the%rst deie
hih an re#$ae (ra&i$e auum
tube in
a$most a$$ its (untion
It has &ood mehania$ stren&th andmaintenane (ree
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')A+ %
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