Interested to Buy Any Domain ? << Click Here >> for more details...
Why is shaft current insulation required on large motors &
when should it be checked i.e. before or after assembly?
- 2 Answers
- 5231 Views
- Aramco, I also Faced
- E-Mail Answers
Answer Posted / avd
In large motors both bearings needs to be insulated to
avoid flow of current through bearings.This flow of current
is caused in rotor due to high flux in the large motors. If
current flows through bearings there will be pitting in the
bearings and will cause premature bearing failure. To give
path to current, genaraly carbon brushes are used at motor
shaft which are grounded at other end.Hence flow of current
through bearings avoided.
After assembling of motor on bearing padastal both
bearings insulation resistance shall be checked by megger.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
how to calculate the power factor when instantaneous voltage and current has harmonics in it ?
What are the causes for the failures of sandwich type (Al) busducts?
how to find the multiplication factor for digital energy meter and analog energy meter
Explain the different regions in frequency response?
In Designing the rating & accessories of a MCCB how to choose the type of releases..means what is the basis for selecting, thermal magnetic, electromagnetic & microprocessr based releases
What is the use of mc( moving coil) in dc voltmeter and dc ammter and what is the use of ( moving iron)in ac voltmeter nd ac ammeter
what is the reactance,capacitance & impedence electrical armoured & unarmored Cables.
is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.
What are the advantages and disadvantages of open loop control system?
why electronic instruments is more favorable than electrical?
how i can calculate the size for fire cable
why 15 kw motor winding resistance is low then 5 kw motor winding resistance?
why we use four type of phase angle difference between pimary & secondry winding of a transformer & where we use them?
is the value of inductance depends upon the evalue of thitha in doubly excited machine?
Shall I use 40A semiconductor Fuses in 32 A SFU ? Frame size is same. What Happen if Fuses burn on SFU?
