Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 30, Problem 3SQ
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Explain the process of achieving smooth acceleration using a reduced voltage starter.
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Why starters are used for DC motors.
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Explain why reduced current is important during the motor acceleration
Electric drive motors are usually running at high speed commonly at 1,800 rpm, 3,600 rpm or more. When you wish to use this electric motors to drive an equipment requiring a 40 rpm speed, which among the mechanical elements (gears, sprockets, pulleys) are ideal to use? Explain
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Electric Motor Control
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- Can you give me all the different types of DC motor its quite confusing coz some info says it has only 4 which is series , shunt , compount , and permanent magnet which is only under the category of brushed DC motors it doesnt include yet the brushless and the sub category however when you recognize or notice that in flowchart there are several like the one self excited etc I wonder if its an updated version though but I need you to list all of them and explain each and what category or subcategory I mean the overall DC motors even in chatgpt there are some added like universal , stepper , servo , coreless and so on. Explain each one. Pls help me if you could summarize or elaborate all at once so that it would be easy to identify or determine the overall information and additionally per category should have definition as well as the followingarrow_forwardWhich is correct for Question 3?arrow_forward٢٢arrow_forward
- in DC shunt motor if the supply voltages 400 volt armature resistance 0.5 ohm and armature current at no load is 5A and at full load 50A the speed of DC motor at full load is 1200 RPM then examine following determine the ratio of back EMF Patna allowed to full load Evaluate Speed of motor at no load Calculate the back emf of dc machine at full load Calculate the speed of dc motor at no load if full load speed becomes 1500rpmarrow_forward22/ What is the armature current value of the DC motor at starting of the Motor? a. less than 10 A b. zero c. Rated current d. High currentarrow_forwardQuestion 4 A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 m2 and a total field-circuit resistance of 55 2. Draw a schematic of the motor in the space below showing all known quantities (resistances, currents, voltages and load). Show only symbols for unknowns. Determine the following for rated operation What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (i) What is the CEMF developed in the armature? (a) 449.9 V (b) 440.0 V (c) 430.1 V (d) 429.3 V (e) 428.5 V (i) What is the total windings (copper) losses in the motor? (a) 4842.5 W (b) 4500.1 W (c) 3520 0 W (d) 1145 W (e) 980.1 Warrow_forward
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