Answer / sridhar nayak

speed control
speed of motor N-120f/p*(1-s)
so sppe can be control by changing following parameter i.e
f,slip, p-number of pole

Answer / sunil kumar

THERE ARE MANY DRIVES ARE AVAILABLES FOR CONTROLLING THE
SPEED OF AC MOTORS SUCH AS VVVF DRIVES, SPRS,FLUID COUPLING
ETC.

Answer / pillay

the speed of an AC motor is dependent on number
of poles and frequency driving it as per the
speed formula already given by Mr sridher nayak
as SPEED =120f/p
So with the use of a frequency converter (vsd)one
can easily and safely vary the speed(by changing
the frequency to make the motor run at whatever
speed you want) OR
if your motor comes prewound with multiple pole
selectable winding, then with the help of change
over contactors you may have options for different
speed but they come with limitations in power and
fixed speed like 750,1000,1500 3000 rpm
Other means as rheostat, variable voltage and anything else will
not give you a safe, economical and reliable long term speed
control.

Answer / harish kumar

more then that above formula is there any thing

Answer / manikanta kumar gopi

I think as per the answer of Mr.G.sreenivasalareddy
Frequency control method and Rheostatic method are same.am
i correct?

Answer / srikanth

Speed of the 3 phase motor can be controlled by Variable
frequency drive. Speed should not be exceeding the rated
RPM of the motor.

Answer / g.sreenivasalareddy

Frequence control,Voltage control,rehostatic control

before transformer oil dielectric strenght tests are taken the oil should be allowed to settle to remove option 1 air bubbles 2 gasses 3 contamination 4 water

0 Answers  

When the DG is running at the time we can connect to capacitor banK? why it is required or not

1 Answers  

What is the type of electrical earthing recommended in hard rock area

2 Answers  

cable selection formulas for electrical load.

1 Answers   Bhel,

how we calculate the 30 KW 3phase electric motor current on noload

23 Answers   Monnet, Siemens, SSR, Supermac Industries,

Can a transformer be used as voltage or current amplifier?

3 Answers   BPDB, REB, Riaz,

Why in DC drive u r using in Klin operation in Cement Plant?

7 Answers  

hi frnds...pls send me aptransco previous papers .....pls..pls,,,(madhar.rocking@gmail.com)and suggest me some websites

0 Answers  

what's the activities of reactor in Buchholz relay?

1 Answers   Yahoo,

What do you mean by the zone of protection?

0 Answers  

Please nybody say, weather the result of Bharat Oman is declared or not? Probable date of declare???????

0 Answers  

why solinoid coil used in tripping rely?and why not other type coil?

1 Answers