Answer / iamdon

Generally the field winding is placed on rotor but it can
be placed on stator, without loss of generality however
such arrangement has limiataions.

Rotating armature type synchronous machines:

DC Field winding is placed on stator where as AC armature
winding is placed on rotor.The electrical input(in case of
motor)and output(in case of alternator)is supplied to or
taken from rotating armature respectively by means of
brush.The brush cann't be employed satisfactorly for large
ratings.So this arrangement is lmited for small rated
machines only.

Rotating field type synchronous machines:

DC Field winding is placed on rotor where as AC armature
winding is placed on stator.The electrical input(in case of
motor)and output(in case of alternator)is supplied to or
taken from stationary armature respectively.This
arrangement is suitable for large rating because it is
relatively easier to design insulation for stationary
armatrure as compared to rotating armature.

Author:arbelectbit@yahoo.com

Answer / sudheer

The other disadvantages are for large rating of machine
lage amount of winding is required hence if armature is
rotating large mechanical input is required to drive prime
mover and there may be large frictional losses mechanical
losses and machine must be capable of withstanding large
amount of centrifugal forces.

State how to produce a constant rotating field by application of alternating currents to stator armature of a three-phase squirrel-cage induction motor

0 Answers   Jindal,

---

what is different between 51N and 51G functions relay?

1 Answers  

---

what is the difference between earth leakage and earth fault?

0 Answers   L&T,

---

Maintenance of transformer???

0 Answers   Adani,

---

How does a tertiary winding filter harmonic(espcially 3rd one) from entering into load system?

0 Answers  

---

what is gridrotor resistance starter

0 Answers  

---

My switchgear busbar is rated at 2000A and just imagine the actual load on busbar is 1000A. From that busbar there are 10 outgoing feeders. Now the question is will the load be 1000A on each outgoing feeder or 100A per outgoing feeder. 2nd thing how do i calculate the load on individual feeder. Thanks for your time. Please provide some clarification on this issue.

1 Answers   Alstom,

---

HOW VFD USED IN ENERGY SAVING

8 Answers   ITC Infotech,

---

what is mean by Digital Logic Meter (DLM)

0 Answers  

---

For example, if I use Star delta transformer for distribution, Can I Connect 230 V lighting load bewteen secondary phase & primary neutarl. What will be the effect, if I connect in this manner?

2 Answers  

---

What is means by MacAdam Ellipse?

1 Answers  

---

I have connected 04nos. earthings to a transformer through 04nos. earthing pits seperately. 02nos. earthings are connected to T/F body, and 02nos. earthings are connected to T/F neutral.T/F capacity is 2000KVA, 11KV/415V. But after completing of 02 years successful operation ,we are facing following problems- 1. CT/PT occured blast one time 2. HT cable box occured blast two times 3. One body earthing strip and one neutral earthing strip of transformer are overlapping at some places. Whenever these two strips are pressed at overlapped points, they made spark. What is the reason of spark? Please explain the reason & rectification of above problems

5 Answers  

---