Subject Code: 181702
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII (OLD) EXAMINATION — WINTER 2018Subject Name: Motion Control
Time: 02:30 PM TO 05:00 PM
Date: 15/11/2018
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) What are the advantages and disadvantages of Step motors? Explain the step motor performance characteristics in detail. [07]
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(b) Give the difference between the PLL and PLS systems. Derive the linearized model for the phase-locked servo systems. [07]Q.2 (a) Explain Bipolar PWM DC motor amplifiers. [07]
(b) Explain effect of lead angle in closed-loop control of Step motors. [07]
OR
(b) Explain the effect of backlash and dead zone in incremental motion. Draw and explain the displacement and velocity waveforms for backlash with low and high friction. [07]
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Q.3 (a) Why Incremental encoders are needs? What are the types of it? Explain each parts of the Incremental encoder in details. [07]
(b) Explain the role of speedup capacitor in active suppression controller. [07]
OR
Q.3 (a) Explain the working of position control system using with and without tachometer feedback. [07]
(b) List the selection criteria of DC motor as Incremental motion application. Discuss at least any two criteria with justification. [07]
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Q.4 (a) Draw and explain D.C. position control system with potentiometers as error detector. [07]
(b) List out the selection criteria for Stepper motor. Explain step angle resolution and torque requirements. [07]
OR
Q.4 (a) Explain Resolvers and Magnetic pickups as Encoders. [07]
(b) What do mean by Optimal control, suboptimal and non-optimal control for IMC? Explain it with appropriate mathematical justification. [07]
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Q.5 (a) What is torsional resonance? Explain its effect in three-body structure. Explain the techniques for minimizing torsional resonance effect in brief. [07]
(b) Enumerate the types of Pulse sources used in motion control. Explain the digital technique based Rate multiplier type pulse sources in detail. [07]
OR
Q.5 (a) Draw and explain bidirectional four-phase single and two phase on logic sequencer circuit with waveform of output phase for each pulses. [07]
(b) Why over drive circuits are required for Step motors? Explain dual voltage control circuit [07]
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