1ph Ac Motor

7/23/2019 1ph Ac Motor

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09/30/15 EMC: AC Motors Roger Enns 1

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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09/30/15 EMC: AC Motors Roger Enns

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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&% 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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09/30/15 EMC: AC Motors Roger Enns


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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09/30/15 EMC: AC Motors Roger Enns (

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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09/30/15 EMC: AC Motors Roger Enns )

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


9/18


Reading the Fa+e!late 2 AC nd."tion Motors


10/18


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&


11/18


3 Phase Motor esign


12/18


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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& S.!!l#


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(& .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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09/30/15 EMC: AC Motors Roger Enns 1(


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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09/30/15 EMC: AC Motors Roger Enns 1)

oot-Mo.nt

1ph Ac Motor

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