Aux 1 Unit 15 Q7

Stator (Stationary Part)

• Frame: The outer frame provides structural support and protection for the internal components. It’s typically made of cast iron or fabricated steel.   1. [Solved] Which part of the induction motor among the following carrie – Testbook testbook.com2. Induction Electric Motor (Squirrel Cage) Explained – saVRee savree.com
• Stator Core:
  • Laminated Construction: Built from thin silicon steel laminations insulated from each other to reduce eddy current losses.   1. The Role of Stator Core Lamination in Induction Motors – Zetwerk www.zetwerk.com
  • Slots: The inner periphery of the core has evenly spaced slots to house the stator winding.   1. How does an Induction Motor work? | CircuitBread www.circuitbread.com
• Stator Winding:
  • Three-Phase Winding: Consists of three sets of insulated copper or aluminum conductors placed in the stator slots.
  • Distributed Winding: The windings are distributed around the stator to create a rotating magnetic field when energized with three-phase AC power.   1. 3 Key Variances in Electrical Stator Windings – EEC Blog blog.electronenergy.com
  • Connection: The winding is typically connected in either a star (Y) or delta (Δ) configuration.

Rotor (Rotating Part)

• Rotor Core:
  • Laminated Construction: Similar to the stator core, it’s made of laminated silicon steel to minimize eddy current losses.
  • Slots: Contains parallel slots on its outer periphery, slightly skewed to reduce noise and improve performance.   1. In squirrel-cage induction motors, the rotor slots are usually given slight skew in order to testbook.com
• Rotor Winding (Cage):
  • Conductor Bars: Consists of uninsulated aluminum or copper bars placed in the rotor slots.
  • End Rings: The bars are short-circuited at both ends by heavy end rings made of the same material.   1. 3-Phase Induction Motor, Definition, Working Principle, Types – Testbook testbook.com
  • Cage Structure: This assembly of bars and end rings forms a cage-like structure, hence the name “squirrel cage rotor.”
• Shaft:
  • A central shaft passes through the rotor core, providing the axis of rotation.
  • It transmits the mechanical power generated by the motor to the load.

Other Components

• Air Gap: A small gap between the stator and rotor, allowing for relative motion and magnetic field interaction.   1. Air Gap Monitoring in Motors and Generators – Power-MI power-mi.com
• Bearings: Support the rotating shaft, minimizing friction and ensuring smooth operation.   1. Induction Electric Motor (Squirrel Cage) Explained – saVRee savree.com
• End Shields or Bearing Housings: Enclose the bearings and support the shaft at both ends.
• Cooling Fan: Attached to the shaft, it circulates air to cool the motor.
• Terminal Box: Houses the electrical connections for the stator winding.

Key Points:

• Simple and Robust Construction: Caged rotor motors are known for their simple and rugged construction, making them reliable and cost-effective.   1. Squirrel-cage rotor – Wikipedia en.wikipedia.org
• No Slip Rings or Brushes: Unlike wound rotor motors, they have no external connections to the rotor, eliminating the need for slip rings and brushes, reducing maintenance requirements.
• Self-Starting: They are inherently self-starting due to the induced currents in the rotor cage.

In summary: A three-phase induction motor with a caged rotor consists of a stator with a three-phase winding and a rotor with a cage-like winding made of bars and end rings. This simple and robust construction, along with its self-starting capability and low maintenance requirements, makes it a popular choice for various applications in the marine industry and beyond.  

1. Solved A three-phase induction motor consists of a stator | Chegg.com

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