Why a starter is used for a motor?
- 50 Answers
- 134073 Views
- L&T, Nilachal Polytechnic, I also Faced
- E-Mail Answers
Answer Posted / deepesh k v
Starter are basically used to reduce the starting current.
I = ( V - Eb ) / R.
Where I is the field winding current,
V the voltage and Eb - Back up emf and R the winding resistance.
During starting Eb = 0, and R - a very small resistance.
so, as the high current passes through the winding, there is
chance for winding to burn out. When the motor attains the
normal speed it generate the back up emf, enough to reduce
the winding current.
To avoid this we need to reduce the voltage(V) or increase
the winding resistance. Since the reduction of supply
voltage is difficult to attain, a starter is used, which
will push high resistance during starting and gradually
reduces and fully removed from the circuit when the motor
attains the full speed.
| Is This Answer Correct ? | 227 Yes | 25 No |
Post New Answer View All Answers
how we can calculate 2 phase welding transformer rating or total power?
If VFD is On but no starting commond on it. so how many outpout voltages of VFD
How to test Alternator stability test for REF relay
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
How to calculate earth fault current for 6.6 KV , 50 HZ , 756 Amps , 3000 RPM , 0.8 PF generator
for 100 HP Induction motor service factor is 1.2(SF) we placed a VFD at the motor side load is balance with 0.3 Amp's Phase to Phase but at incoming of VFD load is un-balance with 10 to 20 Amp's what will be cause of load un balance
state basic meaning of 'INDUSTIAL AUTOMATION'?
What is the tests required for a 132 kV, 400 kV , 765 kV for a Circuit Breaker and Power Transformer before commissioning ?
what are the protecyion of transformer & generators
The windings of a transformer are divided into several coils, because?
what is difference between speed mode and torque mode in motor?? explain in simple words please.
prove that power consumed in 3 phase delta system is 3 times as compared to 3 phase star system
what is the efficiency of thyristor
What is the role of Dedicated earthing in UPS System?
what is meant by k-rating in isolation transformer?what is k9, k14 stands for?
