3-phase Induction Motor Construction Presentation
| Introduction to 3-Phase Induction Motor Construction | ||
|---|---|---|
| • The 3-phase induction motor is the most widely used type of electric motor. | ||
| • It consists of a stator and a rotor, which interact to produce rotating motion. | ||
| • The stator is the stationary part, while the rotor is the rotating part of the motor. | ||
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| 1 | ||
| Stator Construction | ||
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| • The stator is made up of a laminated iron core, which provides a low-reluctance path for the magnetic flux. | ||
| • It contains three sets of windings, spaced 120 degrees apart, to create a rotating magnetic field. | ||
| • The windings are usually made of copper and are insulated to prevent short circuits. | ||
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| 2 | ||
| Rotor Construction | ||
|---|---|---|
| • The rotor can be either squirrel cage or wound rotor type. | ||
| • In squirrel cage rotor, it consists of laminated iron cores with conducting bars embedded in them. | ||
| • In wound rotor type, it has three sets of windings connected to slip rings, allowing external resistance to be added. | ||
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| 3 | ||
| Stator Winding Arrangement | ||
|---|---|---|
| • The three-phase windings are usually connected in a star or delta configuration. | ||
| • In a star connection, the windings are connected to a common point, forming a neutral point. | ||
| • In a delta connection, the windings are connected in a closed loop without a neutral point. | ||
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| 4 | ||
| Rotor Bars and End Rings | ||
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| • The rotor bars in a squirrel cage rotor are short-circuited at both ends by conducting end rings. | ||
| • The rotor bars and end rings are usually made of aluminum or copper for good conductivity. | ||
| • The number of rotor bars determines the starting torque and efficiency of the motor. | ||
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| 5 | ||
| Motor Enclosure and Cooling | ||
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| • The motor is enclosed in a protective housing, which provides mechanical support and prevents the entry of dust and moisture. | ||
| • Cooling is important for efficient motor operation, and it can be achieved through various methods like air circulation or liquid cooling. | ||
| • The cooling system ensures that the motor operates at a safe temperature, preventing overheating and damage. Note: This is a brief overview of 3-phase induction motor construction, and more detailed information can be found in technical literature or textbooks on electric motors. | ||
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| 6 | ||
