Background Study in Electrical Machines
Background Study in Electrical Machines ECE 329
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This 2 page Class Notes was uploaded by Fredy Okuneva on Thursday October 22, 2015. The Class Notes belongs to ECE 329 at University of Idaho taught by Herbert Hess in Fall. Since its upload, it has received 26 views. For similar materials see /class/227727/ece-329-university-of-idaho in ELECTRICAL AND COMPUTER ENGINEERING at University of Idaho.
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Date Created: 10/22/15
Problem 121 in thetext The linear machine shown in Firgure P115 has a magnetic flux density of 05T directed into the page a resistance of 0 25 ohms a bar length of 10 meters and a battery voltage of 100V a What is the initial force on the bar at starting What is the initial current flovxf b What is the noload steady state speed ofthe bar c lfthe bar is loaded with aforce of 25N opposite the direction of motion what is the new steady state speed What is the ef ciency ofthe machine under these circumstances t0 025 ohm i 4 BO5T X X X X I10m XXXX Figure P115 Linear Machine for Problem 121 Part a We assume negligible inductance in the loop f Bli B 05T 1 10m vS 100V RS 025ohm VS i i 400A RS f Bli f 200N Part b We assume negligible losses to friction the only losses are in the resistance Steady state means thatthe generated voltage in the bar is the same as the input voltage As a result the cu rrent goes to zero in steady state eB1v 100V B05T 11m e m v v 200 B1 5 Part c The given force must be generated by a current in the given field F1 F1 25N 1 E i 50A From here we find the generated voltage and the velocity 5 VS 7 iRS e 875V v i v 1752 B1 5 Problem 2 Identify the following parts of a dc machine Armature Field Stator Rotor Leads or cables Terminals Brushes Field pole Field winding Field magnets Frame End caps Commutator Armature windings Teeth Slots Bearings Shaft These machine parts are best shown by the student on the recorded lesson
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