The pioneer express., 1912-01-19
MOTOR AND .YNaMo.
0i6arent In Function. f:t Almost ldsA.
IS 4 sieat IN Conssrast.on. s..ss

Il 0t6orent In Function. S..t Almost lden.
sicat u Conssrast.os. AZ l.ss: V
Y Is u VERY ss,i,ln,, .,rr"r - s,onf,lss
motor With II dsn;.,s j. ana but vpr:s
i few. Outxids. ut l.lp,.l Real engineering
circles. ssli, explain tile difference l...s
tweeu tllese twN ilachinex. Tile news
paper mao writes about the .'dyu,
mos lilrDlnH nut aud setting the
street cur tnl iirs. ar tells Of th.. ,.iniG
'motOrs" wllirllng at trauiendnls
speed in the power house. and very
few realize that II mistake ilas l,t.,.l.
na6a.
To explain In the simplest language.
q dynamo IL msch!ue driven by ne.
chanlcal energy. which converts thai
mechanical energy into e.pctric.ty.
another form Of energy. a motor IN
machine that takes the electrical
energy generated ly the dynamo aud
converts Il back again into mecl,an.
ical energy. And. turi0,lsly enough
the two machines nrs. almost Identical
In their construction. Indeed. some,
dynamos cup be operated us motors
and some motors az dynam,n. without
any change clatever
Going little into detail. n dynamo.
or generator. as Il il now more com.
monty called by electrical men. IL Il
machine consisting Of what is called
an armature which IL made to revOlve
between the l,Oles 0f magnet ar
group Of magnets. The nrmature CON.
tains great many loops of wire.
which cut tile lines Of magnetic force
which Cow from one magnet pole to
that Of opposite polarity. Although
no one can see how II Is done. 1t Is
nevertheless true that this simple prsm..
ess causes current 0f elecirici to
dow through the wire Of the armature.
which ma! lie led cut Of the latter
through sCitable sliding contacts or
brushes and sent out thrmlgh the con.
Quoting wires Of n circuit which n,ay
extend many miles. The current IL
supposed. for convenience. to dow out
over one wire and hack over the other.
keeping M continuous How through
the armature and outside Circuit.
There ycu have the dynamo. To
operate the dynamo mechanical pnery
such as that Ut a steam engine nr
water wheel In required. The more
current you take out Of the armxture
the harder Il IN to turn.
Now. II 7ou take q machine similar
to . dynamo away out somewhere on
the line and connect its terminals to
the tVVO Nciress ~ thp siPcuff ths, s.,e.
rent which II being generated b. the
dynamo d.wx through the armature
Of this second machine. and. 10 and
behold. the nrmature begins to spin.
There you have the motor. which In .
nothing more thnn dynamo running
backward and using up current In.
stead Of producing 1t. Tut q pulley on
the shaft Of the motor aud you Eet
power again. which II
what you started out With. That ts
Why motors are 10 economical and
where mechanical power IL
required. Great dynamon In . power
station generate current In vast guam
kltiea. which is sent out over the lines 4
10 be uaed up In mUtors Of all tyres
md aizes from thirty-aecond Of a !
horsepower up to thousand hor,se-
power. m desired. Now. when ynu
want to operate 4 serving machine by
power you huy little motor t0 do Il.
4 few years ago Il would hare been
necessary for you to put III q boiler
md steam engins.-Electsical News
Bulletin.