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An electrical motor is an electromechanical device that converts electrical energy into mechanical energy. In the case of three-phase AC ( Alternating Current ) operation, the most widely used motor is a 3 phase induction motor , as this type of motor does not require an additional starting device. These types of motors are known as self-starting induction motors.
To get a good understanding of the working principle of a three-phase induction motor, it's essential to understand the construction of a 3 phase induction motor . A 3 phase induction motor consists of two major parts:
| Stator of 3 Phase Induction Motor |
The rotor of three phase induction motor consists of a cylindrical laminated core with parallel slots that can carry conductors. The conductors are heavy copper or aluminum bars fitted in each slot and short-circuited by the end rings. The slots are not exactly made parallel to the axis of the shaft but are slotted a little skewed because this arrangement reduces magnetic humming noise and can avoid stalling of the motor.
The stator of the motor consists of overlapping winding offset by an electrical angle of 120 o . When we connect the primary winding, or the stator to a 3 phase AC source, it establishes rotating magnetic field which rotates at the synchronous speed.
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