How Electric Motors Work - 3 phase AC induction motors

The video tutorial explains the working of induction motors, detailing their components like the shaft, fan, stator, and rotor. It covers the cooling mechanism to prevent overheating and describes the electromagnetic principles that enable the motor's operation. The tutorial also explains the three-phase induction motor configuration and the electrical connections required for its operation, including delta and star configurations. Finally, it provides calculations for voltage and current in these configurations.

What is the primary function of the shaft in an induction motor?

• To generate electrical energy

• To rotate and connect to mechanical components

• To cool the motor

• To insulate the coils

Why is the fan important in an induction motor?

• It supports the shaft

• It helps in cooling the motor

• It generates electrical energy

• It insulates the coils

What type of rotor is commonly used in induction motors?

• Cylindrical rotor

• Squirrel cage rotor

• Disc rotor

• Helical rotor

How does the stator generate a rotating electromagnetic field?

• By using a three-phase power supply

• By using permanent magnets

• By using a single-phase power supply

• By rotating the stator physically

What happens when electricity passes through a wire?

• It generates light

• It generates heat

• It generates a magnetic field

• It generates sound

What is the role of the rotor in an induction motor?

• To generate electrical energy

• To insulate the stator

• To create a magnetic field

• To rotate and align with the stator's magnetic field

How are the stator coils arranged to create a rotating magnetic field?

• In a circular pattern

• 120 degrees apart

• In a straight line

• 180 degrees apart

What is the main difference between star and delta configurations?

• Delta uses more voltage and current than star

• Star uses more voltage than delta

• Delta uses less current than star

• Star uses less voltage and current than delta

In a delta configuration, what is the line-to-line voltage if the supply voltage is 400 volts?

• 200 volts

• 400 volts

• 600 volts

• 800 volts

In a star configuration, what is the voltage across each coil if the line-to-line voltage is 400 volts?

• 400 volts

• 230 volts

• 200 volts

• 100 volts