Induction Motor

Question 1

What are the types of induction motor rotors?

Answer 1

Squirrel cage rotor
Wound rotor

Question 2

Squirrel cage rotor

Answer 2

Conducting bars laid in slots carved into rotor face and shorted at the ends by large rings

Question 3

Wound rotor

Answer 3

Complete 3 phase winding set mirroring stator, ends tied to slip rings on rotor shaft and shorted through brush on slip rings

Question 4

Why is induction motor called rotating transformer

Answer 4

It works by induced voltage and current

Question 5

Why is induction motor singly excited machine

Answer 5

Power supplied only to stator

Question 6

Magnetizing reactance of induction motor is ________

Answer 6

Much smaller

Question 7

Describe power flow of induction motor

Answer 7

Input electric power goes to stator cooper loss and core loss, which then goe to air gap power, after which we have rotor copper loss. Then the power is converted to mechanical and we lose friction and windage losses and stray losses before output