Types of Three Phase Induction Motor
An induction motor is also called asynchronous motor as it
runs at a speed other than the synchronous speed. Like any alternative
electrical motor, induction motors have two main parts – the rotor and the
stator.
Stator
As the name indicates stator coil could be a stationary a
part of induction motor. A three-part offer is given to the stator coil of the
induction motor.
Rotor
The rotor could be a rotating part of induction motor. The
rotor is connected to the mechanical load through the shaft. The rotors of the
3 part induction motor square measure more classified as:
1. Squirrel Cage Rotor
2. Slip Ring Rotor or Wound Rotor or Phase Wound Rotor
Depending upon the kind of rotor used the three-phase
induction motor is classed as:
1. Squirrel Cage Induction Motor
2. Slip Ring Induction Motor or Wound Rotor Induction Motor or Phase Wound
Induction Motor
The construction of stator for both the kind of three-phase The induction motor remains the same and is discussed in brief below.
The stator of Three Phase Induction Motor
The stator coil of the 3 part induction motor consists of 3
main parts:
1. Stator frame
2. Stator core
3. Stator winding or field winding
Stator Frame
It is the outer part of the three-phase induction motor. It is main operated is to support the stator coil core and therefore the field
coil. It acts as a covering and provides protection and mechanical strength to
all the inner parts of the machine. The frame is either created from formed or
unreal steel. The frame of 3 part induction motor ought to be sturdy and rigid
because the air gap length of 3 part induction motor is incredibly tiny.
Otherwise, rotor won't stay concentrical with stator coil which is able to
create to the unbalanced magnetic pull.
Stator Core
The main operate of the stator coil core is to hold
alternating flux. In order to scale back the eddy current losses, the stator
coil core is laminated. This laminated type of structure is made up of stamping
which is about 0.4 to 0.5 mm thick. All the stamping are stamped together to
form the stator core, which is then housed in a stator frame. The stampings
square measure typically created from element steel, which reduces the
hysteresis loss.
Stator Winding or Field Winding
The slots on the outer boundary of the stator coil core of the 3
part induction motor carries 3 part windings. This 3 part winding is equipped
by 3 part ac offer. The 3 phases of the winding square measure connected either
in star or delta relying upon which kind of beginning technique is employed.
The squirrel cage motor is mostly started by star-delta
stater and hence the stator of squirrel cage motor are delta connected. The
connexion 3 part induction motor square measure started by inserting
resistances therefore, the stator winding can be connected either in star or
delta. The winding wound on the stator coil of 3 part induction motor is
additionally referred to as field coil and once this winding is happy by 3 part
ac offer it produces a rotating magnetic field.
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