why the starting torque is high in dc series motor..
Answers were Sorted based on User's Feedback
Answer / nilkanth tailor
COZ, TORQUE IS DIRECTLY PROPORTIONAL TO THE SQUARE OF THE
CURRENT...SO THAT THIER IS VER HIGH CURRENT PRODUCE IN THE
STARTING OF DC SERIES MOTOR...AND IT IS DIFFICULT TO
CONTROL HIGH CUURENT...SO GENERALLY D.C. SERIES MOTOR
GENERALLY USEB IN TRAIN...CAUSE TRAIN REQUIRE HIGH STARTING
TORQUE...DUE TO HEAVY LOAD
Is This Answer Correct ? | 13 Yes | 2 No |
Answer / naveen
Torque is proportional to flux and current.
reason why starting torque is high in series motor only is:
in DC series motor, flux is also proportional to current since the field winding is series with DC motor.
and the reason why its high in start is :
in starting back emf is 0 . current=(V-Ef)/R when Ef is 0 current attains high value which decreases as the speed of motor increases and thus the Ef.
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / ubendran mv
In SERIES MOTORS, the field windings are connected in
series with the armature coil. The field strength varies
with changes in armature current. When its speed is reduced
by a load, the series motor develops greater torque. Its
starting torque is greater than other types of dc motors.
Its speed varies widely between full-load and no-load.
Unloaded operation of large machines is dangerous.
Is This Answer Correct ? | 3 Yes | 2 No |
Which circuit breaker arc quenching time is low AC or DC breaker?
If the Power Factor of generator is 0.85...What does this mean and Can the motors connected to this generator operate at PF more than 0.85 ?
What is the RMS and DFT principle of analogue maesurments. Which way they are advangages. where which princples give optimum results.
Can u Explain about the electronic trivector meter and the use of data converters in them?
hey guys i recently saw a long transmission line in which a sort of balloons in red and white color were hanging at each section.do u have any idea why are they kept for?
Why A.C. capacity given in Ton. Ex. - 1.5 Ton
what is difference between single phase and three phase.
What is water cooled chiller plant?
in electrical control panel. how can i choose the cable rating. (example - 11kw motor, 18-25A mpcb}
Can anybody tell abt concrete encased earthing or grounding?
Whats the type of current and potential transformers?
Why slip ring ind. motor power consumption is low compare to induction motor .same 90 kw motor used same load output