Motors?

[jonnymc11]

seems ALOT of people have been getting questions on motors in their 301 exam, this is my weakest area aswell.

was wondering if anyone could throw up some facts that will be likely to be asked for certain motors?

Cage motors?

Capacitor start?

Capacitor start, Capacitor run?

wound rotor induction motors

etc etc. ; ..

 

[searley]

if you put motors in the serach this forum on the main page there is loads about motors and you will find everything you need.

 

[jonnymc11]

thanks mate, tutor seems to think it will just be identifying the parts on the drawing, for eg "find the field winding" and "which mototr drawing is this?" etc...

true?

 

[cm304eex]

Do you have the linsley book from page 207 tells you all you need to no.

 

[sbcfm]

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/indmot.html

http://www.allaboutcircuits.com/vol_2/chpt_13/9.html

http://www.teslamotors.com/blog4/?p=45

google what you are stuck on , there are some helpful sites out there.

 

[jonnymc11]

Its just i dont know what they can ask me on motors? apart from calc.

 

[jonnymc11]

11. A 400v 50Hz has a line current of 50A and 0.8 lagging, The power dissipated will be

A 20KW

B 9.2KW

C 27.712KW

D 16KW

1.732 (one line) ? x others?

 

[jonnymc11]

18. Cage rotor induction motors are considered to be:

a) variable speed machines B) low torque machines

c) constant speed machines d) low speed machines

i always thought it was CONSTANT SPEED

ive also made this up, revison for my exam, would you say the below was correct? thanks.

Induction Motor