Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 31, Problem 4SQ
To determine
Explain why four motor contacts are there for high speeds and low speeds in Figure 31-4.
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1- What is the starting torque developed by a split-phase or a capacitor start
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A 4-pole, 650v shunt motor has 720 wave connected conductors on its armature, The full-load armature current is 80A and the line flux
per pole is 0,04Wb. The armature resistance is 0.4 ohms. Calculate the full load speed.
Select the correct response:
548.80 rpm
321,88 rpm
643.75 грm
344.86 грm
A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?
Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
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- What is the reason why a synchronous motor can be found running at no load?arrow_forwardExplain the different methods of breaking DC Motorsarrow_forward7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,arrow_forward
- 2- A simple wave wound de shunt motor has the following data: Armature resistance =0.1 ohm Shunt field resistance = 100 ohm Number of poles = 2 Number of conductors = 400 Mechanical and core loss at full load = 2000 W. When the motor is connected to a 400 Volt supply and is fully loaded it draws 104 A. Calculate at a speed of 3000 rpm: i) Armature current and E.M.F ii) Flux per pole iii) Copper losses within the machine. iv) Developed torque, shaft torque and efficiency. v) Sketch the power flow diagram at full load. vi) Motor speed if an external resistance of 0.4 ohms is added to the armature circuit while the load torque remains constant.arrow_forwardQuestion 9 What factors affect the torque of a dc motor? (Select all that applies) A) Number of armature conductors B) Type of armature winding C) Armature current D) Field current E) Speed of the motor F Number of polesarrow_forwardCan 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_forward
- Q2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…arrow_forwardNonearrow_forwardSynchronous motor when the load is taken completely while working at full load in all properties Does it change properties? Explain.arrow_forward
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