motor overhauling
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Motor Overhauling
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Why overhauling isrequired ??
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Motor details
• Plant-EC
• Tag No-P702 B
•
Mae-!ie"ens• !r# no-$%$&7
• 'W-22
•
(PM-$)*0• +,-)0
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Overhauling Pro.edure
• (e.eive /or order or the "otor
– Che. i any a1nor"alities is "entioned#
• isual ins3e.tion o "otor – Note do/n the "issing4da"aged 3arts#
• Measure 5( 6P5 in T "otors8 andresistan.e4indu.tan.e o "otor#
•
Beore dis"antling 5M9 "ar :E and N:Eside#
• !tart dis"antling o "otor ro" N:E side#
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IR in
megaohms(-E )00
;-E )00
B-E )00
(-; )00
;-B &00
B-( &00
Windings Resistance(ohms) Inductance(mH)
( 0#&0 2#7
; 0#)& 2#%
B 0#&0 2#7
5( at Megger voltage&00
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Bearing dis"ounting
• Methods – Cold dis"ounting
• ydrauli. 3uller
• Me.hani.al 3uller
– ot dis"ounting• =sing 5ndu.tion heater
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+it > toleran.e"easure"ent• Clean :E-N:E shields o "otor /ith
diesel#
• Measure housing > shat di"ension/ith "i.ro"eter gauge#
• Mae sure they are /ithin thes3e.ied li"its#
• +or *2$042(! 1earing
Min 6""8 Ma@ 6""8 Measured
6""8
!hat6:E8
&0#002 &0#0$& &0#0$0
6N:E8
&0#002 &0#0$& &0#00&
ousing:E
A0 A0#0%& A0#002
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• Clean stator9 rotor9 shat9 housing91earing inner and outer .over /ith.lean .loth#
• Clean and insert inner 1earing .a31eyond 1earing resting shoulder onshat#
• Mount 1earings on :E and N:E side#
• 33ly resh grease to ll grease.avities#
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Bearing "ounting
• Methods – Cold "ounting
• With ha""er
• =sing "etal 1lo.s
– ot "ounting• 5ndu.tion heater
•
5ndu.tion 3late• Oil 1ath
• ot "ount
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=sing indu.tion heater
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• lign the 5nner Bearing Cover holes /ith holes o
housing 1y suita1ly su33orting the shat 1y a sot slingee3ing grease in-let hole in 1earing housing on to3#
• =se guide ring to avoid "ars on inner ra.e > rollers#
• Tighten 1earing housing 1y gradually tightening )1olts at equally o33osite lo.ation or unior" insertiono housing#
• t the sa"e ti"e 3ull the 1earing Cover as near as3ossi1le and tighten the .o"3lete 1earing asse"1ly#
• Then insert .ir.li3 and then housing on to shat#
• !i"ilarly9 asse"1le the N:E side and 3ut - seal#• t this stage the rotor should 1e ree to rotate#
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+inal tests
• No load test 6.he. 5( value 1eorethe tests8
• i1ration analysis
• Me.hani.al integrity – @ial 3lay
– (adial 3lay
– (un out
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i1ration nalysis
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Me.hani.al 5ntegrity .he.
• @ial 3lay- 0#02 ""
• (adial 3lay-0#02 ""
•
(un out- 0#0% ""
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TN' ;O=