Answer / jignesh parmar

IN MOTOR FLUX IS DIRECTLY PROPORTIONAL TO RATIO OF VOLTAGE
Vs frequency, i.e v/f it is derived from bellow formula
e= V = 4.44*flux*no. of turn*frequency
motor speed = 120*f/p
i.e speed can be ccontrolled by variying
frequency , but if only frequency increases then flux will
also increse,& flux increse beyond some level it cause
saturation also increse of flux increse loss, so to
maintain constant flux voltagge is also incresed in same
propotion to frequency as flux is directly proportion to
ratio of voltage/frequency i.e (v/f)
and that is called as variable voltage variable frequency
drive

Answer / nsnaidu

flux is directly proposnal to voltsge

Answer / kishore

flux is directly proposnal to the voltage.

Why the Motor takes High Current in Starting time?

5 Answers  

---

i have gear oil pump with single phase motor.some time its motor starts running in reverse direction rather than forward direction...whats the reason behind this issue. 1- either capacitor is week? 2- or winding is week?

0 Answers  

---

what is meant by armature reaction?

13 Answers  

---

If not maintained 3 phase clearance,what happened ?

2 Answers  

---

What is the meaning of high reputuring in HRC fuse.?

1 Answers   ABB,

---

A separately excited dc motor having 2 ohm armature resistsance draws a current of 10A and torque developed is 20 Nm under rated field condtion. the speed of the motor under the rated field condtion , when it is connected to a 100V DC source and delivering 10Nm torque....

2 Answers   DRDO,

---

what is the function of choke in tube

1 Answers  

---

what is Aircraft earthing and what does it do?

6 Answers  

---

The series field winding has low resistance while the shunt field winding has high resistance. Why?

0 Answers  

---

what's the different between ELCB, ELR and ELS?

1 Answers   CP,

---

Wat will happen if R-phase of an alternator is connected to B- Phase of AMF panel fed from alternator

4 Answers  

---

what is the condition for YnD11

0 Answers   Bhel,

---