understanding the motor nameplate

8/18/2019 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



5am#le /ame late



/um'er o& oles ? Motor 5#eed



Motor ,rame 5i6e



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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understanding the motor nameplate

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