Answer / vijayan

The core is laminated to minimize the eddy current losses
in ac circuits. The voltage applied in dc machine is dc,so
there is no eddy current losses, no need of laminations.

Answer / raja

I support answer 1. But in detail. The flux in the stator of
DC machine (Yoke, poles) is not a time varying one. So it
can't produce any induced emf in those structures. In turn
there is no possibility to have eddy current. And since
there is no reversal of pole there is no possibility of
hysteresis loss also. In turn there is no need to laminate
the core.

Answer / althaf

the voltage induced in the armature conductors is ac,even though it is a dc machine.so the core is to be laminated

Answer / s.sakthivel

(1) to develop the residual magnets


(2) it is act as a permanent pole compare then AC supply pole so we are not laminated stater pole

What is Ten Delta Test ?

8 Answers   Areva,

---

What is the polarization index value ? (Pi value)and simple definition of polarization index ?

0 Answers  

---

in 11kv generators the neutral point is connected to earth via earth coil while in the 33 / 11 kv transformer the neutral point is connected to earth via earth resistor why? 

1 Answers  

---

WHY IN WESTERN COUNTRIES THE ELECTRIC SHOCK IS VERY SLOW AS COMPARE TO INDIA.&IF ANY ONE HAVE CORRECT KNOWLEDGE THEN SEND OTHERWISE NOT

1 Answers  

---

what is the formula to find battery back up of ups?

3 Answers  

---

---

how we could know that generator running anti clockwise with seeing the rotating direction of prime mover or engine

1 Answers  

---

when ac current flows thru d coil of a contactr,it energizes,magnetic field attracts d contact of the coil...nw wont dt ac current in d contct induce current back on to d coil thru mutual inductance leading to high currnt in d coil

0 Answers  

---

what is different between DIGITAL and ANALOG?

3 Answers  

---

2. If 8.35%Z means the percentage impedance of 132/11kV transformer self,will like to reconfirm the percentage impedance that is supplied from power company?

2 Answers  

---

If Dg set load increase 25%, How much increase fuel Consumption (15 kva 2 cylinder DG set)

0 Answers   TATA,

---

Connection diagram for KW meter and  Kva meter

0 Answers  

---

WHAT IS THE MEANING CREEPAGE DISTANCE

1 Answers  

---