EE 17 - 3 - Induction Machines

Asynchronous machines

Another name for induction machines, signifying they never run at synchronous speed.

Stator

The stationary part of the motor, consisting of the outer frame, core, and winding.

Rotor

The rotating part of the induction motor.

Squirrel cage rotor

The type of rotor known for its simple and rugged construction.

Slip

The specific term for the difference between the speed of the revolving field (Ns​) and the rotor speed (N).

120f/P

The formula for calculating Synchronous Speed (Ns​).

S×f

The formula for calculating rotor frequency (fr​).

Synchronous speed

The speed of the rotor magnetic field relative to the stator structure.

Outer frame

The part of the stator that supports the core and protects the inner parts of the machine.

Leakage flux

The term for the flux that links the rotor conductors but not the stator winding.

three phase

Induction motors are classified mainly as single-phase or _ induction motors.

three phase

Almost more than 90% of the mechanical power used in industry is provided by _ induction motors.

slip ring

Phase wound rotors are also widely known as _ rotors.

synchronous

Slip is expressed as a percentage of _ speed.

supply frequency

When the rotor is stationary (at standstill), the frequency of rotor currents is the same as the _.

S×Ns​

The speed of the rotor field relative to the rotor surface is equal to _.

constant

Rotor resistance remains _ because it is determined by the properties of the conducting material.

standstill reactance

Rotor reactance (X2​) is equal to slip (S) times the _.

3

Single phase induction motors are usually built in small sizes, up to _ H.P.

Shaft

[Three Phase Induction Motor Parts] What is A?

Three-Phase Supply

[Three Phase Induction Motor Parts] What is B?

Stator

[Three Phase Induction Motor Parts] What is C?

Rotor

[Three Phase Induction Motor Parts] What is D?

Stator Frame

[Stator Parts] What is A?

Terminal Box

[Stator Parts] What is B?

Winding

[Stator Parts] What is C?

Core

[Stator Parts] What is D?

Ventilation Ducts

[Stator Parts] What is E?

Tooth

[Stator Stamping Parts] What is A?

Slot

[Stator Stamping Parts] What is B?