1ph ac motor
TRANSCRIPT
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Single-Phase AC Motors
Used for lo-h! a!!li"ations onl# $t#!i"all# less than 5
h!%&
'o o!erating effi"ien"# $t#!& (0-)0*%&
Sa+e ,asi" o!erating !rin"i!les as 3-!hase ,.t fieldalternates rather than rotating&
ire"tion of rotation not defined as start.!& M.st .se
s.!!le+ental +ethod to "reate rotating field&
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Single Phase nd."tion Motors
1&% Resistan"e S!lit Phase Motor2 Se"ondar# inding of fine high
resistan"e ire .sed&
2 Change in ind."tie"hara"teristi"s "a.ses AC !haseshift ,eteen !ri+ar# and
se"ondar# indings "reating arotating field&
2 0R losses in se"ondar# indingoerheat 4.i"l# s.ited for loloads onl#&
2 Centrif.gal sit"h .sed todis"onne"t start inding on"e+otor rea"hes a,o.t 65* ofs#n"hrono.s s!eed&
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Single Phase nd."tion Motors
&% Ca!a"itor Start Motor2 Motor ired ith to identi"al
indings 90 degrees a!art&
2 Ca!a"itor !la"es in series ith one
inding "reating !hase shift togenerate rotating +agneti" field
2 'oer 0R losses d.ring start
2 7etter s.ited to starting high
inertial loads
2 Utili8es a "entrif.gal sit"h to dro!
start inding hen +otor s!eed
rea"hes 65* of s#n"hrono.s
s!eed&
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Single Phase nd."tion Motors
3&% Shaded Pole Motor2 Part of !ole s.rro.nded ,#
"o!!er ring&
2 Ring dela#s for+ation of
+agneti" field in that !ortion of
the !ole "a.sing rotor to t.rn in
that dire"tion&
2 i;ed dire"tion of rotation
"annot ,e "hanged after +fg&
2
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Shaded Pole Motor Cont>d
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Single-Phase AC nd."tion Motor Perfor+an"e
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Uniersal Motors
?!erate on single !hase AC or C !oer
Essentiall# a series-o.nd C +otor "o+!lete ith
ar+at.re "o++.tator and ,r.shes&
?!erates on AC as ,oth field and ar+at.re reerserotating in the sa+e dire"tion&
A!!li"ations:
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S#n"hrono.s Motors
R.ns at s#n"hrono.s s!eed no sli!& Magnets on rotor lo"-on> to rotating fl.; Motor +.st .sed e;ternal start assist s."h
as:2 E;ternal start +otor
2 S4.irrel "age ,.ilt into rotor to start as an ind."tion+otor2
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Reading the Fa+e!late 2 AC nd."tion Motors
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Reading the Fa+e!late
ClassificationStartingTorque%
BreakdownTorque %
StartingCurrent
Slip Typical Application
Design Bnor+al startingtor4.e G nor+alstarting ".rrent
100 - 00 00 - 50 For+al = 5*
ans ,loers "entrif.gal!.+!s G "o+!ressors et"&here starting tor4.ere4.ire+ents are relatiel# lo&
Design Chigh starting
tor4.e G nor+alstarting ".rrent
00 -50 00 - 50 For+al = 5*
Cone#ors stirring +a"hines"r.shers agitatorsre"i!ro"ating !.+!s et"& herestarting .nder load is re4.ired&
Design D
high startingtor4.e G highstarting ".rrent
65 65 'o H 5*
Bigh !ea loads loads ithfl#heels s."h as !.n"h !ress
shears eleators e;tra"torsin"hes hoists oil ell!.+!ing G ire draing+a"hines&
1& esign
FEMA s!e"ifies +ini+.+ al.es of lo"ed-rotor ,readon and !.ll-.! tor4.e&
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3 Phase Motor esign
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Dor4.e C.re Der+inolog#
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Reading the Fa+e!late2 "ont>d
& ns.lation
ndi"ation of +otors resistan"e to te+!erat.re&
FEMA ratings A7 or B A ,eing loest resistan"e B ,eing highest&
?!erating te+!erat.re is a res.lt of a+,ient te+!erat.re $air te+! in area
s.rro.nding +otor% and heat generated ,# +otor itself $R losses start.!
losses%&
Altit.de li+its +a# also ,e s!e"ified in "o+,ination ith ther+al li+its d.e
to red."ed heat re@e"tion "a!a,ilit# at higher altit.des& IMotors r.n "ooler at
loer altit.des&J
3& Ma;& A+,ient&Ma;i+.+ a+,ient te+!erat.re degrees C at hi"h +otor "an
o!erate at na+e!late ratings ith na+e!late ins.lation "lass&
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Reading the Fa+e!late2 "ont>d
& S.!!l#
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Reading the Fa+e!late2 "ont>d
(& .t# C#"le
* ?n-Di+e AlloedContin.o.s or 15 30 5 +in.tes !er ho.r o!eration&
Most s+aller +otors are designed for "ontin.o.s d.t#&&
6& Seri"e a"tor
Contin.o.s oerload "a!a,ilit# of +otor&
f +otor is e!t ithin te+!erat.re li+its and ele"tri"al s.!!l# "an +aintain
na+e!late oltage leel +otor +a# ,e r.n ,e#ond na+e!late !oer o.t!.t
safel#&
1&15 indi"ates 115* seri"e fa"tor or 15* oerload "a!a,ilit#&
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Reading the Fa+e!late2 "ont>d
9& Mo.nting
C-a"e 2 Motor is +o.nted to +a"hine fa"e of +otor&
Rigid 7ase 2 Motor has feet integral to the +otor ,od# that allo it to ,e
rigidl# fastened to the +a"hine&
Resilient 7ase 2 Motor has r.,,er-isolated feet integral to the +otor ,od#
that allo it to ,e +o.nted ,.t isolated fro+ the +a"hine&
10& En"los.re
ra+e si8e indi"ates di+ensional standard to hi"h +otor as
+an.fa"t.red& Standards s!e"if# e;ternal di+ensions +o.nting shaft
dia+eter and length "-fa"e or foot +o.nting di+ensions et"&
11& ra+e
?P 2 ?!en ri!-Proof 2 Motor o!en free e;"hange of "ooling air
en"los.re !roides !rote"tion against li4.id ithin 15 degrees of erti"al&
DEC 2 Dotall# En"losed-an Cooled 2 7etter !rote"tion against e;ternal
"onta+ination and in"l.des an integral fan to for"e "ooling air a"ross +otor&
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C-a"e Ca!a"itor Start/R.n Motor
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oot-Mo.nt