can i have the methods of speed controls for 3 phase AC
MOTORS.
Answers were Sorted based on User's Feedback
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
Is This Answer Correct ? | 11 Yes | 1 No |
Answer / sunil kumar
THERE ARE MANY DRIVES ARE AVAILABLES FOR CONTROLLING THE
SPEED OF AC MOTORS SUCH AS VVVF DRIVES, SPRS,FLUID COUPLING
ETC.
Is This Answer Correct ? | 3 Yes | 0 No |
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.
Is This Answer Correct ? | 1 Yes | 0 No |
more then that above formula is there any thing
Is This Answer Correct ? | 2 Yes | 2 No |
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?
Is This Answer Correct ? | 1 Yes | 1 No |
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.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / g.sreenivasalareddy
Frequence control,Voltage control,rehostatic control
Is This Answer Correct ? | 1 Yes | 2 No |
why control circuit voltage always chooses to be 110v and 220v? and in where it is 110v and 220v? and in where it AC and DC?
generaly all power generating devices is expressed in KVA or MVA then why power ststion is expressed in MW
how is the cable tray designed & how its total length is calculated for an Industrial plant Say for Ex. (500KW Motor Load)
How can you calculate in detail the VA burden of current transformer used for Restricted earth fault protection? Please understand that the CT required here is Class PX or X. Also please show the calculations for knee point vtg, stabilizing resistor, magnetising current.
what difference beetwin phase voltage & line voltage and phase current& line current ?
PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM
Why cannot we insulate HT over head cable to avoid ionization of air around the HT Cable?..By this we can minimise corona loss also..
What technology is used in latest generators?
how to mesure the earth pit value and what is the minimum value of single earth pit?
How Humming noise generated in starter motor which was used the start the engine in a vehicle/car/Truck?.Moreover Starter motor was operated in DC power supply. Can you guys clarify ?
why using carbun bresh in dc motor
can i connect the two phases of scott connected transformer,if not why?