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Three-Phase AC machines

Three-Phase AC machines. Resource 2. Three-phase Cage Rotor Induction Motors. Three-phase Cage Rotor Induction Motors. Three-Phase AC Machines Resource 2. Aims. 1. To understand the principle of the operation of the motor.

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Three-Phase AC machines

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  1. Three-Phase AC machines Resource 2 Three-phase Cage Rotor Induction Motors

  2. Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 Aims 1. To understand the principle of the operation of the motor 2. To describe the construction of a cage rotor induction commercial motor 3. To understand the factors that affect the performance of the motor

  3. Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 Objectives At the end of this lesson you should be able to: • Describe the principle of the rotating magnetic field • Describe the principle of rotor cage induction • Describe the construction of a commercial stator • Describe the construction of a commercial cage rotor • Explain and calculate synchronous speed • Explain and calculate fractional slip • Describe the effect upon the performance of the motor by connecting the stator in star and delta • Performance simple calculations involving electrical and mechanical parameters that describe the performance of the motor • Describe the performance curve for a cage rotor induction motor

  4. 1 2 4 5 3 12 10 11 6 7 8 9 Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 1. Motor Shaft Construction of Commercial Motor 2. Name plate 3. Key and Keyway 4. Bearings 5. Terminal Box 6. Lifting eye 7. Laminated Rotor 8. Air flow intake 9. Cooling Fan 10. Mounting base 11. Cooling fins 12. Stator coils

  5. Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 Rotor cage Copper age rotator bars Embedded within laminated Steel discs Laminated steel discs Copper end ring The complete rotor assembly Shaft

  6. Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 Stator Made of laminated iron slotted rings Slots insulated with Mylar sheet Coils inserted into slots

  7. Three-phase Cage Rotor Induction Motors Three-Phase AC Machines Resource 2 Stator coil connections 2. Construction of Commercial Motor STAR DELTA Link A’ with B, B’ with C and C’ with A Link A’ , B’ and C’

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