Answer Posted / 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
| Is This Answer Correct ? | 79 Yes | 17 No |
Post New Answer View All Answers
how we will deside the high voltage value
In case of generator when we consume more power produces by it why load on generator increase and starts sound more. and how it is adjusted..
How maesure earth neutral value & how much maximum value value required in between earth & neutral.
thyristor controlled APFC panel design parameter?
What is the RME and explain the full form and what is the RME work?
If more than rated DC voltage appears across trip coil of the breaker, what will happen? e.g. in 110V DC circuit system, if voltage across battery terminal showing 121 V
how to select fuse rating for a 3-phase motor ???
I have a situation to design sub-Distribution board/Panel meant for feeding power sockets. In the incomer CAN i Take TP MCCB with Neutral Link and All the outgoing feeders with to sockets with TP MCCB and Neutral Link? P.S : My System is IT Earthing
what is transient enclosure vltage , very fast transients, very fast transient over voltages
reason of diode failure in alternator
any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?
why only exciting current is shown not primary current in transformer???
is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.
what is the significance of tan&delta and how it performed in power transformer
How to calculate the Efficiency of Chiller
