DCM 17 Speed Control of DC motors

Lectures on Electrical Machines By Dr. Tirupathiraju Kanumuri, Assistant Professor, NIT Delhi
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Lectures on DC Machines By Dr. Tirupathiraju Kanumuri, Assistant Professor, NIT Delhi
Link for Lectures on Transformers: • Transformers
Lectures on DC Machines: • DC Machines

[@mahi581993best]

The way you teach Machines is amazing. thank you Sir.

[@MJ_Suresh]

One of the excellent teacher I have ever seen sir 🙏🙏🙏

[@Venu_Gopal72]

Clearly explained sir, thank you so much, all my doubts are cleared

[@kumarkvrs2342]

thank you very much for clear explanation

[@alphaelectrical404]

Sir i love your reaching. Because you i love now machine. Thank u sir.

[@surendrakverma555]

Excellent lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@ujjallaha]

Please make video on
1. Magnetic circuit.
2.magnetic saturation.

[@technicalpahadivlogs]

Thank you so much sir... Very helpful

[@AJ-et3vf]

Awesome video! Thank you!

[@iswaryathirunav3194]

Thanq much sir for ur valuable video

[@sandeepmaheshwar4873]

Really nice sir😍

[@reshabdasrajak47]

Amazing sir.. thanks for the great effort.. Waiting for more such interesting videos

[@rinshakabeer5538]

Thank you sir......

[@AkashMishra-mb4gc]

Thank you sir 👍

[@ramreddypeddi5301]

Thank you sir

[@ManishSaini-xd1bp]

Sir everywhere voltage control method is denoted as series parallel control method
And you tell us that method (series parallel control) is paralleling feild coil method

[@jyosnaramulolla8347]

In case of flux control method why the flux cannot be strengthened .Can we use flux control method for below rated speeds?

[@jyosnaramulolla8347]

Tq sir

[@vamsimouli9640]

Sir small doubt in flux control method
Power constant
It is electrical power or mechanical power
Please tell me sir

[@vamsimouli9640]

@@lecturesinelectricaleng thanks sir...reply iccharu

[@DhananjayKumar-by5dm]

At 11:48
In series field control (Ise= Ia ) As No of turns increses , is there any effect on Ia ,, or Ia remains constant as it depend only on load

[@Nameless-ls4jb]

Sir in series motor field diverter the relation between Speed,back emf and Ia and Ise
N2/N1=Eb2 *Ia/Eb1*Ise afthis this u wrote
N2/N1=Eb2*Ise/Eb1*Ia
After this i got really confused?

[@moinshaikh1963]

4:41 Dear sir
I was not able to process speed being inversely proportional to torque so i developed this algorithm, is it correct?
Torque ~ current*flux
flux ↓
Torque ↓ thus deceleration -dn/dt
speed ↓
Eb ↓↓ .....Eb ~ flux*speed thus double decrease
current ↑↑..... linearly proportional as function of V-Eb/Ra
Torque ↑↑
speed ↑↑.....since load torque remained undisturbed

[@saiadapa8359]

Sir , ward leonard method is used for which type of dc motors(shunt, series, compound)

[@anwesh07]

is torque and speed in case of motor is produced due to back emf and incoming current respectively

[@prabinmishra178]

Can we get hand out of above presentation.

[@anwesh07]

Sir, in case of motors is direction of torque Opp to the direction of motion

[@anwesh07]

@@lecturesinelectricaleng sir then why practically with increase in torque speed decreases...

[@saikumar4330]

Sir why voltage speed control is not used for shunt motor

[@suyanshmishra9487]

Because it requires variable dc voltage source which makes it expensive

[@DhananjayKumar-by5dm]

At 10:06
Sir Problem regarding speed (above or below ) in field diverter method .
As i know speed inversely prop to current , As current increses in series field by incresing Rd speed fall down ,Then it be suited for speed below rated speed .
Again you are saying at 10:23
flux decreses (but phi dec as Ise incr)

[@zechariahrjoshua7827]

For given load at rated speed, flux & back emf are constant . By connecting resistance parallel to field, the field current decrease(since current through the field is depend on the load & it has two paths)then flux decrease therefore speed increase. To decrease speed below rated speed, field current should increase but by connecting parallel resistor to field, the field current never increase for a given load

[@abhijithanilkumar4959]

Sir is it correct that the brass arc( of we use it) connects the no voltage coil to the starting arm???
Or is it connected to stud no. 1 of starting resistance
Thank you

[@RAVIKUMAR-zr9yy]

@Lectures in Electrical Engineering Sir..... What will be The Supply with which all the machines will be connected to operate with ?

[@RAVIKUMAR-zr9yy]

@@lecturesinelectricaleng but Sir.... How Would The DC Generator, That is employed there, Rotate With AC Supply ? As The Field Is Separately Given DC Supply To Operate.

[@RAVIKUMAR-zr9yy]

@@lecturesinelectricaleng Sir.... I am asking that how can the provided supply be AC if two of the three machines in the arrangement are of DC type and which needs DC supply ? IS IT CLEAR or I SHOULD MAIL IT TO YOU ? Please provide your mail if you still don't get the question.

[@RAVIKUMAR-zr9yy]

@@lecturesinelectricaleng but two separate supplies are not shown here SIR .

[@RAVIKUMAR-zr9yy]

@@lecturesinelectricaleng NOW it's clear SIR... Thank you so much 👏 Your efforts are truly admirable.

[@varma237]

@@RAVIKUMAR-zr9yy I guess Dc motor uses commutator to convert to Ac in case of motor as motor has mechanical output which is possible only when the poles are alternating.

[@sticktoone2213]

In field control why only above normal speed only possible