1. What are the three main advantages of three-phase wound-rotor induction machi
ID: 2250303 • Letter: 1
Question
1. What are the three main advantages of three-phase wound-rotor induction machines over three-phase squirrel-cage induction machines? 2. What is the primary difference between the main components of squirrel- cage rotors (i.e., the conducting bars) and the main components of wound rotors (i.e., the windings)? 3. What is the effect of short-circuiting the rotor windings of a three-phase wound-rotor induction machine on the machine operation? 4. What happens to the active power P of a three-phase wound-rotor induction machine whose rotor windings are short-circuited as the machine mechanical power PM increases? 5. What happens to the reactive power Q of a three-phase wound-rotor induction machine whose rotor windings are short-circuited as the machine mechanical power PM increases?Explanation / Answer
1) ADVANTAGES OF SLIP RING OVER SQUIRREL CAGE INDUCTION MOTOR
2) DIFFERENCE BETWEEN MAIN COMPONENTS OF SLIP RING AND SQUIRREL CAGE ROTOR
SLIP RING
SQUIRREL CAGE
Winding
Yes
No
End rings
No
Yes
Cu bars
No
Yes
Slip rings
Yes
No
External resistance
Yes
no
3) Effect Of Short Ckt On Rotor
4) Increases
5) Increases
SLIP RING
SQUIRREL CAGE
Winding
Yes
No
End rings
No
Yes
Cu bars
No
Yes
Slip rings
Yes
No
External resistance
Yes
no
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