Answer / kunal

Motors are generally cooled by three methods :
1. naturally ventilated: no special ventilation cooling by
natural conduction and radiation.
2. blower ventilated:
separate blower, with small external motor and filter
provided. which allows motor to accept additional external
air and force heated air out
3. separately ventilated motor:
separately ventilated by ducted air flow through the enclosure
more information can be found at
http://www.globalspec.com/reference/10786/179909/Chapter-3-AC-and-DC-Motors-DC-Motors-Enclosure-Types-and-Cooling-Methods

Answer / logu

motor top side extra readiator unit fixed and inlet cold
water circulation. water upserve the hot air...then reduced
the motr windng temp .

I have a transformer whose primary operates at 230V, 50Hz for which the secondary voltage will be 12V, 50Hz. What will be the secondary voltage if the primary is fed with 400V, 8KHZ Signal?

6 Answers   ABB,

---

What cmos is and its benefits?

0 Answers  

---

If in a 3 phase supply if the load current is 200A what value of current the each phase R,Y & B will carry?

5 Answers  

---

What is the Impedance, inductive reactance calculations

0 Answers  

---

If you have an earth with pilecap then your resistance is really low. why and how?

0 Answers  

---

Is there any calculation to find unknwon(unferroled) phases R Y B in alternator,3 phase motor anybody shoot my problem. how can we notice this is the respective phase?

2 Answers  

---

what is the difference between potential transformer and capacitive voltage transformer?

1 Answers  

---

how to find total current when kva is 30.4 given ? should we use root 3 (1.732) in the formula?

2 Answers  

---

what are the energy savings methods that are existing in coal based power plant?

1 Answers  

---

234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

0 Answers   Jomel,

---

what is the difference between circular wdg & ractangular wdg?

0 Answers  

---

How to select the releases for MCCB ?

1 Answers  

---