Induction Motor Components

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Questions and Answers

What does the stator of an induction motor primarily produce when supplied with 3-phase currents?

Unidirectional magnetic flux
Revolving magnetic flux (correct)
Variable speed rotation
Constant voltage output

How does the number of poles in a stator affect the speed of the induction motor?

Number of poles has no effect on speed
Speed remains constant regardless of poles
More poles increase the speed
More poles decrease the speed (correct)

Which type of rotor is characterized by a cage-like construction?

Squirrel-cage rotor (correct)
Wound rotor
Drum rotor
Induction rotor

What is the formula for synchronous speed in an induction motor?

<p>Ns = 120 f/P (D)</p> Signup and view all the answers

Which term is not associated with a type of rotor in an induction motor?

<p>Capacitor motor (C)</p> Signup and view all the answers

Flashcards

What is the stator of an induction motor?

The stationary part of an induction motor containing a 3-phase winding. It generates a rotating magnetic field that induces current in the rotor.

What is the rotor of an induction motor?

The rotating part of an induction motor. It can be either a squirrel-cage or wound rotor.

What is a squirrel-cage rotor?

A type of rotor in induction motors with a simple, cage-like construction. It's simple and robust, making it suitable for general-purpose applications.

What is a wound rotor?

A type of rotor in induction motors with a winding similar to the stator. It allows for speed control and higher starting torque.

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What is synchronous speed in an induction motor?

The speed at which the magnetic field rotates in an induction motor. It's calculated using the formula Ns = 120f/P where f is the frequency and P is the number of poles.

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Study Notes

Induction Motor Components

Induction motors have two main parts: a stator and a rotor.
The stator houses a 3-phase winding, powered by a 3-phase supply.
The number of poles in the stator winding determines the motor's speed. More poles mean a slower speed.
The 3-phase current creates a rotating magnetic field of constant magnitude at synchronous speed (Ns = 120 f/P).

Rotor Types

Squirrel-cage rotor: This rotor type is used in squirrel-cage induction motors.
Phase-wound/Wound rotor: Also known as phase-wound motors, wound motors, or slip-ring motors.