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

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%

0 Answers  

---

excitation limit of an excitor

0 Answers  

---

Generation of voltage for each phase are same of a turbogenerator.Although the short circuit current flow when two phase of turbogenerator are shorted(where current can't flow without potential difference),why?

0 Answers  

---

What is the difference between earthed & unearthed system?

2 Answers   HCL,

---

What is the formulae of Megger value for a A.C.Motor

0 Answers  

---

---

What is the range of the stator resistance of 3 phase induction motor?

1 Answers  

---

List of equipments required foe industrial repair lab.

0 Answers  

---

What is meant by impedance? difference between high & low impedance ?

0 Answers  

---

How I design capacitor bank for different load.7MW connected load.

3 Answers   Samtel,

---

what is Wave Trap? And its Function ? Detail? Where it is Used?

7 Answers  

---

why commutator are not used in rectification purpose in power electronics?

1 Answers  

---

What is OLTC in a transformer, specify its fuction.

35 Answers   Bhel, Isgec, L&T,

---