Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 69709 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / b.t.ramakrishna rao
a current carrying conductor placed in a magnetic filed experiences a force
if d.c excitation is provided a constant magnetic field is produced hence the rotor conductors can experience a force.
where as if a.c excitation is given an alternating magnetic field is produced which results zero net magnetic filed,hence the rotor conductors fials to experience a force
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
what is earthing.how we make it,describe briefly.
what about GD square and its important for motor design?
What is main cause of cable's terminal point burned in Lug on high temperature although lug and cable selection is ok as per stantard and also tightness is ok as per situation. so please take in deep and tell correct answer thanku.
Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA
Is it possible to obtain 480v or 550v in single phase output by giving the input to 230v to a single phase torodial type transformer without using a stepup transformer?
how can motor both beasrings insulation resistance can be check?
I want formula to calculate current loss with distance in km.I searched many sites but didn't right answer.Plz reply me
what is load vs Torque curve & why it is used?
What is trip and closing coil in cb? Why need of them
HOW CAN WE DECIDE THE SUPPLY VOLTAGE FOR MOTOR ACCORDING TO ITS RATING(IF ANYONE KNOWS GIVE IT WITH EXAMPLE AND ITS CALCULATIONS)
what is lrs tank water resistance.
explanation of mesh bus bars
What is load boxes ?
Graphs of measuring power and speed on dc motor
Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.
