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

What is auto changeover and how it works plz write details.

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