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ED Mid

The document is a mid-semester examination for an Electric Drives course. It contains 5 questions assessing various topics in electric drives: 1) Load torque components and classification with examples. 2) Calculating the starting time of a drive given motor and load parameters. 3) Deriving the mathematical expression for steady-state stability criteria and applying it with examples. 4) Explaining the control objectives of electric drives and the generalized closed loop position control concept, and the significance of the inner current loop. 5) Calculating maximum and minimum torque and speed values for a shearing machine drive given its load diagram and motor characteristics.

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67 views1 page

ED Mid

The document is a mid-semester examination for an Electric Drives course. It contains 5 questions assessing various topics in electric drives: 1) Load torque components and classification with examples. 2) Calculating the starting time of a drive given motor and load parameters. 3) Deriving the mathematical expression for steady-state stability criteria and applying it with examples. 4) Explaining the control objectives of electric drives and the generalized closed loop position control concept, and the significance of the inner current loop. 5) Calculating maximum and minimum torque and speed values for a shearing machine drive given its load diagram and motor characteristics.

Uploaded by

vinukondanikhil2002
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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(An Institution of National Imporlance)

DEPARTMENT OF ELECTRICAL ENGINEERING


MID SEMESTER EXAMINATIONS, September 2022
WARAaN AL
IVB.Tech (Electrical &Electronics Engineering) ISemester
EE 401: ELECTRICDRIVES
Date: 25/O9/2023 Time: 10.00-12.00 Noon Max, Marks: 30
N.B.: Answer ALL Questions
A Explain the load torque components and classification of the load torques with examples. [4MJ

2 Calculate the starting time of adrive with the following parameters: (4M]

J= 10 kg - m²,T,= 15 + 0.5om and T;=5+0.6wm


A Derive the mathematical expresion for steady-state stability criteria for electric
molor-load [6M]
system.
Obtain the cquilibrium points and determine their steady-state stability with numerical exapmles
when motor and load torques are
T=-1- 20,m and T,=-3/Om
A What are the control objectives of the electric drives? Explain the generalized closed loop [5M]
position control concept of electric motor drive. What is the significant of inner curent loop?
$ Load diagram of a shearing machine shows a periodic fluctuation of torque with 10,000 N-m [6M]
required for 10 sec and 1000 N-m for 20 sec. The combined inertia of motorand flywheel referred
tothe motor shaft is 1000 kg-m². Calculate maximum and minimum values of torque and speed.
The motor speed torque characteristic is a straight line given by the equation T-20000-20N, N
m, where Nis the speed in pm.

Amotor having a suitable control circuit develops atorque given by the relationship T, =a0+b [5M]
where a and b are positive constants. This motor is used to drive a load whose torque is
expressed as T, =co* +d, where c and dare some other positive constants. The total inertia of
the rotating masses is J.
a. Determine the relations amongst the constants a , b, cand din order that the motor can
start together with the load and have an equilibrium operating speed?
b. Calculate the equilibrium operating speed?
C. Will the drive be stable at this speed?
d. Determine the initial acceleration of the drive?
e. Determine the maximum acceleration of the drive?

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