What will happen if supply to three phase motor is given
wiyhout inerting rotor in it?How much current it will draw?
Answer Posted / xyz
Normally, when a motor is switched on, it takes a heavy
current (6 to 7 times the rated current of the motor).This
is because there is no back emf. Then the rotor starts
rotating and picks up speed. As the speed increases and
reaches the rated speed, the back emf increases and the
current decreases and reaches the normal value.
When a motor is switched on without the rotor,the situation
is similar to the one that exists at starting time. There
is no back emf and hence the current will be heavy.Since
there is no rotor, there is no question of back emf. Hence,
if the protection does not trip the supply, the winding
will burn.
You can use this as a project for your science exhibition.
You put the motor (without the rotor) in such a way that
the axis is vertical.Now the vacant space created by the
removal of the rotor is like a cylinder. Close the bottom
part with a plate. Now you can put coins in that
cylinder.Apply a small voltage to the motor winding to
create the revolving magnetic field.The coins will start
moving in the direction of the revolving magnetic field.
Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
how is working bearing heater?
WHY EARTHING NOT NEEDED IN BATTERY IN SUBSTATION
can mini-curcuit supply MIL-tested transformer !
i have 3500 amp load and select current transformer and perches.how i calculate .please understand
we have 3.5MVA-11/6KV transformer. how can we calculate earth fault current and NGR calculation?
Draw torque - speed curve and load curve of induction motor? mark operating point ?
Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?
What is the difference between Encoder and Resolver?
How efficiency of thermal plant can be improved?
why would amp draw on neutral wire be as much as amp draw on the hot leg.
What is the working principle of MIG welding? and its out put Voltage?
please give me all the Alarm .Trip ,Safety Relays & Conditions of UPS Systems mail me on ashokbabunhce@gmail.com
What is the RMS and DFT principle of analogue maesurments. Which way they are advangages. where which princples give optimum results.
AL=0B9H,bl=75H, ADD AL,BL AL=____________? CF________? OF___________?
What is difference between Sample test and Routine test in safety standard?