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MOTOR (3 PHASE AC)MOTOR (3 PHASE AC)
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1500/1440RPM(4POLE)1500/1440RPM(4POLE)Refine Search
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3000/2880RPM(2POLE)3000/2880RPM(2POLE)Refine Search
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0.12HP-3000/2880RPM
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Introduction of Three Phase Induction Motor
MOTOR
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MOTORAn electric motor is an electrical machine that converts
electrical energy into mechanical energy.Induction motor consist
mainly two parts
Stator
Rotor
StatorThe stator holds the windings which receive energy from
the supply mains and the rotor alsocarries windings in which the
current is induced.
The laminated stator core, made of thin sheet steel is slotted
on its inner cylindrical surface andthe winding consists of
embedded coils disposed in exactly the same manner as those of
arevolving field synchronous alternator designed for the same
number of poles. It is wound for adefinite number of poles, the
exact number of poles being determined by the requirements ofspeed.
Greater the number of poles, lesser the speed and vice-versa when
the stator winding issupplied with current, produces a magnetic
flux which is of constant value but revolves atsynchronous
speed.
Where f=frequency
P=no. of poles
= synchronous speed
Synchronous speed minus the actual speed gives the slip in the
motor.
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The revolving magnetic flux induces an EMF in the rotor by
mutual induction.
RotorRotor winding is generally of the squirrel cage type, in
machines of large size consists of copperbars occupying nearly
closed slots on the outer periphery of the rotor core: these bars
are solidlybrazed to end rings, In early motors of this type, the
bars were bolted to the end rings, but thisconstruction was found
to be faulty because the expansion and contraction caused
bytemperature changes under load condition to loosen the bolts and
thereby alter the contactresistance, which though small in itself,
was considerably in comparison with the smallresistance of the
winding as a whole. This consideration led to the construction,
which is now inmotors of small and moderate size, where the entire
cage winding, bars and end rings together ismade of aluminum cast
in place of an integral unit. The rotor bars are permanently short
circuitedon themselves hence it is not possible to add any external
resistance in series with the rotorcircuit for starting.
SlipThe difference in speed for any given load between
synchronous speed and load speed is calledthe slip of the motor.
Slip is usually expressed as the percentage of the synchronous
speed.Since the amount of slip is dependent on the load, the
greater the load, the slip will be, greaterthat is the motor will
run slower.
The slip of an induction motor may be expressed in the following
manner:
1.) As a percentage of synchronous speed.
2.) As a decimal fraction of synchronous speed.
3.) Directly in revolution per minute.
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Our Major Brands of Three Phase Motor areHavells Three Phase
Motor, ABB Three Phase Motor , Crompton Greaves Three Phase
Motor
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