understanding the motor nameplate
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Understanding the motor nameplate
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Motor Basics
A electric motor is a de!ice usig electrical eerg" to#roduce mechaical eerg".
$or%s o the #rici#le o& #roductio o& mechaical &orce '"the iteractio o& a electric curret ad a magetic &ieldElectromagetic &orce (em&).
A t"#ical A motor cosists o& two #arts*
+). A outside statioar" stator ha!ig coils su##lied with Acurret to #roduce a rotatig magetic &ield.
2).A iside rotor attached to the out#ut sha&t that is gi!e atorque '" the rotatig &ield.
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Mode o& ,uctioig*
Eerg" o!ertor
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Motor -!er!iew
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Motor T"#ical arts
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lic% to edit Master title st"le
Motor /ame late
+. 0orse#ower1$ ratig
2. /um'er o& #hases13oltage1,requec"
. Motor RM
4. Motor ,rame 5i6e
7. Moutig
8. 9sulatio lass1Am'iet Tem#erature
:. /ema Torque lass
;. . oectio 5"stem
++. T"#e o& #rotectio
+2. T"#e o& Eclosure
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5am#le /ame late
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5am#le /ame late
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/um'er o& oles ? Motor 5#eed
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Motor ,rame 5i6e
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9sulatio 5"stem*
Tem#erature lasses
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/EMA A@ B@ ad <
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AC Motors – Inductionmotor Comprehensive
chart
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Motor Duty
/ +ontinuous dut The motor 'orks at a constant load for enough time to reach temperature equilibrium"
/0 /hort-time dut The motor 'orks at a constant load& but not long enough to reach temperature
equilibrium" The rest periods are long enough for the motor to reach ambient temperature"
/. 1ntermittent periodic dut /equential& identical run and rest ccles 'ith constant load" Temperature
equilibrium is never reached" /tarting current has little effect on temperature rise"
/2 1ntermittent periodic dut 'ith starting /equential& identical start& run and rest ccles 'ith constant load"
Temperature equilibrium is not reached& but starting current affects temperature rise"
/$ 1ntermittent periodic dut 'ith electric braking /equential& identical ccles of starting& running at constant
load and running 'ith no load" No rest periods"
/3 +ontinuous operation 'ith intermittent load /equential& identical ccles of running 'ith constant load and
running 'ith no load" No rest periods"
/4 +ontinuous operation 'ith electric braking /equential identical ccles of starting& running at constant load
and electric braking" No rest periods"
/5 +ontinuous operation 'ith periodic changes in load and speed /equential& identical dut ccles run at
constant load and given speed& then run at other constant loads and speeds" No rest periods"
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otor Service Factor
The service factor - /6 - is a measure of periodicall
overload capacit at 'hich a motor can operate
'ithout overload or damage
The NEMA (National Electrical Manufacturers
Association) standard service factor for totall
enclosed motors is "7"
A motor operating continuousl at a service factor
greater than 'ill have a reduced life e#pectanc
compared to operating at at its rated nameplate
horsepo'er"
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Connection Systems:Star-Delta Connection
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onnection System:erminal Box
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ones / Types o protection
8one 0 900
8one 90
8one 7 9 07
E# n (as)
E# t, (
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Types o protection -De!nitions
Tpe of protectionThe specific measures applied to the motor to avoid ignition of a surrounding e#plosive
atmosphere"
p>9 E# pThe e#plosive gas is prevented from entering the motor b maintaining a protective gas
at positive pressure inside the motor 'ith respect to the environment" The inside of the
motor must be purged 'ith a protective gas before the motor is started"
Tpe of protection 1ncreased /afet >e>Additional measures are applied so as to give increased safet against the possibilit of
e#cessive temperatures and of the occurrence of arcs and sparks inside and on e#ternal parts
of the motor 'hich do not produce arcs or sparks in normal operation" E#amples of
additional measures are! ?arger clearances and creepage distances on insulating materials&
reduced 'inding temperature"
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pes o protection - De!nitions
Tpe of protection 6lameproof Enclosure >d>
The parts 'hich could ignite the e#plosive atmosphere& are installed in an enclosure&
'hich 'ill not be damaged in the case of an internal e#plosion and also prevent flame
propagation to the outer e#plosive atmosphere b the use of spark preventing flame gaps"
Tpe of protection non sparking >n>9 E# n
Tpe of protection applied to the motor such that& in normal operation and in certain
abnormal conditions specified b this standard& it is not capable of igniting a surrounding
e#plosive atmosphere"
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ypes o "nclosures
@,< (@pen ,rip
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Types o enclosures
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Close #ut
Ac motors are the heart of the all the drives"
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Tha%s /ote..
Cou 'ere
onderful
Audience