what is meant by armature reaction & where its happen ?
Answers were Sorted based on User's Feedback
Answer / thowsif_emerson_csm team
We know that all current-carrying conductors produce
magnetic fields. The magnetic field produced by current in
the armature of a dc generator affects the flux pattern and
distorts the main field. This distortion causes a shift in
the neutral plane, which affects commutation. This change
in the neutral plane and the reaction of the magnetic field
is called ARMATURE REACTION.
We know that for proper commutation, the coil short-
circuited by the brushes must be in the neutral plane.
Consider the operation of a simple two-pole dc generator,
shown in figure 1-8. View A of the figure shows the field
poles and the main magnetic field. The armature is shown in
a simplified view in views B and C with the cross section
of its coil represented as little circles. The symbols
within the circles represent arrows. The dot represents the
point of the arrow coming toward you, and the cross
represents the tail, or feathered end, going away from you.
When the armature rotates clockwise, the sides of the coil
to the left will have current flowing toward you, as
indicated by the dot. The side of the coil to the right
will have current flowing away from you, as indicated by
the cross. The field generated around each side of the coil
is shown in view B of figure 1-8. This field increases in
strength for each wire in the armature coil, and sets up a
magnetic field almost perpendicular to the main field.
Is This Answer Correct ? | 5 Yes | 0 No |
Answer / karthik raman.b
effect of armature flux over the field(main) flux in DC generator
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / gunasekaran
armature flux oppose the main field so main field will
become week.it is occur in all electrical equipment
Is This Answer Correct ? | 0 Yes | 0 No |
Name the earthings?
battery spicgravity mesuserd?
Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?
what is the difference between core & shell type transformer ?& where we use those transformers ?
1.how many earth pits are required for 1000 k.w plant include substion , transformer ? 2. how many earth pits are required for 500kva generator.what is formula to calcute?
why we need the starters for motors
how to calculate distance between busbar supporters for LT panel, what are the factors influencing in this design
I meggared my 2c*70 sq mm AL AR XLPE cable. its one end show 50 M ohm . is my cable is safe for laying. I have only one phase and neutral.
HOW SKIN EFFECT REDUCE THE CROSS SECTION OF THE CONDUCTOR
1ampear me kitna watts hota hai aur elcb ka pura naam kya hai
18 Answers Al Khayyat, Alpha G, BEC, Bhel, CGS, Electrical, Fiem, Firmenich, HLG Habtoor Leighton Group, Jash, Kandia, Maruti Suzuki, Minda, NTPC, ONEIC, Pace Process Controls, SMTC, SR, Sunrise Electrical, Sushil Enterprises, Suzlon, Voltage,
importance of reactive power management
HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.