Page 308 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

Stator: In 3 Phase motors parts, the stator is the most integral component. It is the stationary part that influences
the rotor to move in the direction of magnetic fields. This part of 3 phase motor further has the following sub-division.
Core: Inside the stator, the laminated structure is present, which is known as the stator core. The stator core has
paired slots depending on the number of poles of the electric motor. Some motors have 2 poles and 3 slots or 3
poles and 4 slots, etc. The speed of the motor is inversely proportional to the number of poles. If the number of
poles is greater, the speed will be less and vice versa.
Stator frame: The outer covering of the stator is called the stator frame. The stator frame is made up of high-
grade material and 100% stainless steel to protect internal parts. It also ensures long life and durability.
Stator winding: The stator winding generates magnetic fields in the stator. The three phases get excited when
connected to the power supply and start producing magnetic fields. The stator windings are insulated and resistive
to ensure protection in unfavourable conditions.
Rotor: Rotor is another important component in parts of 3 phase motor. The moving part the rotates in the
direction of magnetic fields is called a rotor. The rotor of three phase motors carries the current to move the
categories based on rotor structure.
Terminal Box: The terminal box is also prominent in 3 phase motor parts. The terminal box provides a three-
phase power supply through an external electrical supply. The stator windings are connected to the terminal box
via delta or star connection.
Fan: For heat dissipation and cooling, a fan is considered a significant part of 3 phase induction motors. It
maintains the temperature and cools down other internal parts of 3 phase induction motor.
Slip ring or wound type: The wound type rotor generally consists of the slotted armature and slip rings. These
motors provide high and constant starting torque therefore; these motors are widely used in heavy load industries
because it allows external resistance to reduce initial current.
Result: Thus the different types and parts of Ac motors have been demonstrated.

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CITS : E & H - Electronics Mechanic - Exercise 207