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Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now save Save Brake Test on Dc Shunt Motor For Later 95 (19) 95 found this document useful (19 votes) 39K views 4 pages Brake Test on Dc Shunt Motor Uploaded by kudupudinagesh Description: Full description save Save Brake Test on Dc Shunt Motor For Later 95 95 found this document useful, Mark this document as useful 5 5 found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 4 Search inside document Browse Books Site Directory Site Language: English Change Language English Change Language. Brake test also called as direct loading test of testing the motor. Because loading will be applied directly on shaft of the motor by means of a belt and pulley arrangement. The tension in kg can be obtained from the spring balance readings. By increasing the load is slowly, adjust to get rated load current. Due to the braking action of belt the test is called brake test. Thus all the motor characteristics can be plotted. Mostly in our laboratories we use water as cooling liquid. To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. You can download the paper by clicking the button above. APPARATUS REQUIRED: S. No 1 2 3 4 5 6 THEORY: It is a direct method and consists of applying a brake to a water cooled pulley mounted on the motor shaft. The brake band is fixed with the help of wooden blocks gripping the pulley. The sample brake test described above can be used for small motors only. Because in the case of large motors. It is difficult to dissipate the large amount of heat generated at the brake.The load test can be conducted by using a belt brake or rope brake. For a constant applied voltage, the field current is constant for a D.C. Shunt motor. http://augustaelectricalwork.com/editorData/breville-waffle-maker-wm800b-manual.xml

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The flux will, therefore have its maximum value at no-load, and because of armature reaction will decrease slightly as the load increases. For most purpose this decrease can be neglected, and the flux per pole can be regarded as constant. V I a Ra The speed N is proportional to. The fall in speed will not be quite so great. Since the full load drop in the armature is small compared with applied voltage, the speed curve of a D.C. Shunt motor is a slightly drooping curves. Torque (T) is proportional to Ia, since is approximately constant. The torque is proportional to (Ia) the armature current. Hence the torque characteristic is a straight line through the origin. PROCEDURE: 1) Make the connections as per the circuit 2) Give Supply to the motor, by closing DPST switch 3) Start the motor with the help of 3- Point starter. 4) Adjust the speed of the motor to its rated value by varying either field or armature Rheostat as per the requirement. 5) Note down the no load readings. 6) Apply load on the motor by tightening the belt of the pulley. 7) Note down the readings till rated current of motor. 8) Take the readings for different loads. 9) Do the necessary calculations and draw the graphs. Before stop the motor, load should be removed. Connections must be tight. Readings must be noted without any parallax error. Fuses should be properly rated. The operation of the 3-Point starter. Should be slow and uniform. Armature rheostat should be connected in maximum position initially. Field rheostat should be minimum resistance position. VIVA QUESTIONS1) What will happen if the field circuit gets opened during the experiment? 2) What is the variation of speed of the D.C shunt motor when the load increases? 3) How can you adjust the speed of the D.C shunt motor under no load conditions? 4) What is the necessity of three point starter during this experiment? 5) While starting, if the motor rotates in the reverse direction then what you have to do. MANUAL (Regulation-2013). https://www.denizberksoy.com/denizberksoy/usermedia/breville-ultimate-bakers-oven-series-2-manual.xml

Load test on DC Shunt and Compound Motor. 4.. The load on the brake drum increased in steps Documents IP65 DC motor with encoder, brake and gearbox IP65 DC motor with encoder, brake and gearbox. I got to learn many new and interesting things in this college. This college served us with all round growth and learning with many courses, programs, fest organizations, etc. I got complete support from my college whenever needed in any difficulties. The college has greenery environment which makes you very comfortable and fresh. My branch was Mechanical. Practicals are very important with Theory lectures. All practical equipments are available in college. So it was easily understandable to me. The College has well equipped library and it also provides online study materials and mock tests for competitive exams.Different Technical Workshops, Industrial Visit and Placement Trainings are conducted in every year in College. All Sports and Culture Activities are conducted in College which are very enjoyable and entertaining. It was a great experience and I am happy to be part of it.” I feel every student has ability to succeed but quality guidance and supportive environment is required to achieve high level goals. At TPCT’s COE Osmanabad, all professors help you to discover your hidden talent and success quotient to achieve your ultimate goals. In TPCT’s COE,there are knowledgeable teachers and college have good infrastructure, library,grounds,environment and I am happy to be part of it.” I have received more than enough support, technical knowledge, Skills which still encouraging me and I’m glad that I made the choice to choose TPCT’S College of Engineering to study my degree and P.G in Mechanical Engineering. I have gone from having zero confidence in myself to being so proud of what I have achieved in such a short time with the support of all professors and our expertise guides. This college is one who always thinks student benefit first.Osmanabad Pincode:- 413501. http://www.drupalitalia.org/node/75995

Get Latest Price from the seller We are a Partnership company and manufacture the high-quality range of products in varied specifications to fulfill the diverse needs of our clients.Get Best Deal I agree to the terms and privacy policy All rights reserved. The force acting tangentially on the drum is equal to the difference between the readings of the two spring balances. Where the output power exceeds about 2 H.P., or where the test is of long duration, it s necessary to use water cooled pulley. These characteristics are known as the no load saturation characteristics or open circuit characteristics. The shape of this characteristics curve is practically same for all generators whether separately excited or self excited. On plotting the relation ship between I f and E 0 a curve as shown in figure is obtained. The slight curvature at the lower end is due to magnetic inertia. It is seen that the first part of the curve is practically straight. This is due to the fact that at low flux densities, reluctance of iron path being negligible (due to high permeability), total reluctance is given by the air gap reluctance, which is constant. Hence, the flux and consequentially the generated emf is directly proportional to the exciting current. Critical resistance is that maximum value of the shunt field resistance above, which a machine fails to excite. This resistance corresponds to the straight-line position of the magnetization magnetic circuit do not offer any appreciable reluctance to the magnetic flux. Critical speed is that maximum value of the speed of the machine below which the machine fails to excite. The field current is increased uniformly in steps by changing the position of the field rheostat. 7. The experiment is continued till the field gets saturated. 8. Now, the experiment is continued on for decreasing values of I f, in steps by decreasing the tapping of the rheostat. 9. The machine is switched of by opening the DPST switch. 10 Graph: 1. https://climatechange-news.com/images/brake-booster-manual.pdf

(Eg Vs If) Precautions: 1. Connections should be tight. 2. Check the rheostat positions before switching on the motor. 3. Initially the SPST switch should be kept open. 4. Readings should be taken without any parallax error. The only running test needed is no load test. 14 This test is applicable to those machines in which flux is practically constant i.e., shunt and compound-wound-wound machines. The no load current I LO is measured by an ammeter. The no-load armature current is (I LO I sh ) or I ao. In calculating armature Cu loss, hot resistance of armature should be used. Precautions: 1. The field regulator of the motor must be in minimum position while starting the motor. 2. While loading the generator, at each step, the speed of the generator is maintained at its rated value. 3. The generator should not be overloaded. Results: The initial and external characteristics of the shunt generator are plotted by conducting load test. Conclusions: From the graphs plotted, we infer that the external characteristics lie below the internal characteristics. And since the terminal voltages of these machines remain almost constant, these machines are used for charging batteries and also for supplying constant power. Name Plate Details: Apparatus: Theory: Procedure: 1. We should connect the circuit as per the circuit diagram. 2. The motor fields rheostats has been kept in its minimum resistance position and no load has been connected on the generator. 3. The supply is switched on and the motor is started with the help of a starter. 24 4. The speed of the motor is to be adjusted by controlling the motor field resistance. 5. The load has to be switched on and the ammeter and voltmeter readings are to be noted down for different values of load. 6. After the generator has been loaded to its rated value, its load is reduced in steps and finally, the supply is to be switched OFF. Precautions: 1. Loose connections are to be avoided. 2. http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16280a4ab45343---bt-elements-instruction-manual.pdf

The load is to be removed gradually in steps and then the motor is to be switched OFF. Results: Conclusions: The internal and external characteristics of a DC series generator have been plotted. From the graphs plotted, we can infer that a DC series generator has rising voltage characteristics, i.e., with increase in load, its voltage is also increased. And hence such machines aren t suitable to be used for power supply as the voltage doesn t remain constant, but are suitable for being used as boosters. Viva questions: 25 SEPATARION OF LOSSES IN A D.C. MACHINE 26 SEPATARION OF LOSSES IN A D.C. MACHINE Aim: To determine suitable tests on the given D.C. shunt machine and determine from the experiment, the stray losses and separate these into friction, hysteric and eddy current losses. Precautions: 1. The rheostats are to be kept in proper positions while starting the motor. 2. Loose connections are to be avoided. 3. The field current is to be maintained constant for a particular excitation though the speeds are varied, by using the armature rhestat. Conclusions: From the observations made, we conclude that the stray losses vary with speed and these stray losses can be separated into various other losses such as heysterisis, eddy current, fiction and windage losses which vary with variation in speed increasing and decreasing characteristics. Name Plate Details: Apparatus: Theory: Procedure: 1. The connections are made as per the circuit diagram. 2. The field rheostat and the armature resistances are kept at minimum and maximum positions respectively. 31 3. The starter is started with the help of the starter. 4. Now, for the field control method, the armature rheostat is adjusted such that the voltmeter reads 200v. 5. Rf is increased in steps thereby decreasing the field current. The values of I f and speed are noted down. 6. Now, for armature control, the field current is held constant at some selected value. 7. www.daynapidhoresky.com/ckfinder/userfiles/files/candy-c514-manual-download.pdf

The field current is kept constant and the armature rheostats resistance is varied from minimum value to maximum value in steps. 8. The speed for each value of V a is noted down. Graph: Precautions: i) The graph of I sh Vs N is to be plotted.Results: The speed characteristics of the d.c. shunt motor have been determined both in the field and armature control method. N And during the armature control method, the armature voltage varies in proportion to the speed. And hence the curve obtained is a straight line. Viva Questions: 1) In how many ways, we can control the sped? 2) Compare the speed control methods? 3) What are the different losses in D.C machines? 4) What is the purpose of starter? 5) How do you reduce the iron losses? 32 HOPKINSONS TEST 33 Circuit Diagram: 34 HOPKINSONS TEST Aim: To perform Hopkinsons test on a given motor generator set and determine the efficiency of both motor and generator. Name Plate Details: Apparatus: Theory: Procedure: 1. The connections are made as shown in the circuit diagram. 2. The rheostat of the motor and generator fields are kept at minimum and maximum positions and the switch 3. The motor generator set is started slowly with a starter. 35 4. The field current is adjusted to rated value by adjusting the field rheostat of the motor. 5. The generator is excited by decreasing the generator field rheostat resistance. 6. When the voltmeter reads zero volts the switch K is closed. 7. The generator is loaded in steps by decreasing the field rheostat resistance of the generator. 8. The speed and readings of all the metres are noted down for each load. 9. The excitation of the generator is reduced by increasing the field rheostat of the generator and then the switch K is opened. 10. The supply to the motor generator set is switched off. 11. The observations are tabulated. Graph: The output power versus efficiency curves for both the motor and generated are to be plotted. Precautions: 1. Loose connections are to be avoided. 2. {-Variable.fc_1_url-

The rheostats are to be kept at proper positions while starting the motor. 3. The readings of all the metres are to be noted down without any error. Results: The Hopkinsons test on the given motor generator set has been performed and the maximum efficiency of motor has been determined to be and that of generator is . Conclusions: By performing the Hopkinsons test, we can determine the efficiency of the motor or generator by obtaining the stray losses from the test. Form the efficiency curves plotted, we conclude that the efficiency of the generator is more than that of the motor. Viva Questions: 36 BRAKE TEST ON A DC COMPOUND MOTOR 37 Circuit Diagram: 38 BRAKE TEST ON A DC COMPOUND MOTOR Aim: To perform Brake test on a given D.C. Compound motor and obtain the performance characteristics of the motor from the test observation. Name Plate Details: Apparatus: Theory: Procedure: 1. The circuit diagram is connected as shown. 2. The field regulator is kept at minimum resistance position. 3. The belt on the pulley is checked so that theres no load acting on the pulley. 4. The motor is started using the starter. 39 5. The motor is made to run at its rated speed by adjusting the field current. 6. The load is gradually applied on the pulley by tightening the belt around it. 7. The speed, readings of the ammeter, voltmeter and the spring balance readings are to be noted down at each step. 8. The pulley is cooled through out the experiment by pouring water on to it. 9. The experiment is continued till the full load of the motor is reached. 10. The observations are tabulated. Results: The Brake test on the D.C. compound motor has been performed and the performance characteristics have been plotted. The maximum efficiency of the motor has been found to be and the corresponding torque, output, speed and load current are 7.21 N-m, Watts, 1480 rpm and 6.4 A. http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16280a4d5d0bda---bt-elements-manual-user-guide.pdf

Conclusions: On plotting the performance characteristics, we conclude that the torque of the compound motor varies linearly with output power. The load current does not increase linearly with output power as the motor contains both the series and shunt field windings. The speed decreases more pronouncedly than the D.C. shunt motor. 40 This principle Objective: to examine the construction of a 3-phase wound rotor induction motor; to understand exciting current, synchronous speed and slip in this motor; to determine Objective: to examine the design of a 3-phase synchronous motor; to learn how to connect it; to obtain its starting characteristic; to determine the full-load characteristic of Objective: to obtain the no-load saturation curve of the alternator; to determine the voltage regulation characteristic of the alternator with resistive, capacitive, and inductive Objective: to study the properties of DC generators under no-load and full-load conditions; to learn how to connect these generators; to obtain their The amount of voltage produced depends on a variety of factors. EO 1.5 LIST the three conditions necessary to induce a voltage into Take a look at the 1910 nductance Analyzer. www.dayiprofil.com/upload/files/candy-c514-instruction-manual.pdf

Although specifically designed for production testing of inductors and coils, in addition to measuring inductance (L), Objective: to examine the construction of the universal motor; to determine its no-load and full-load characteristics while operating on AC; to determine its no-load and full-load Also study its behaviour under load The stator core and windings of a three-phase synchronous machine are practically identical Voltage is the electrical energy density (energy The purpose of this document is to provide a guide for the selection and application In the stable region of operation in the motoring mode, the curve is rather steep and goes from zero torque The tutorial is of interest to any student studying control systems and in particular Do not make any connections with the power on. The power must be turned What is the maximum number of 100 watt light bulbs which can be lit simultaneously in parallel Part of this circuit is shown below.Resources and methods for learning about these subjects (list a few here, in preparation for your research): Indian Institute of Science, Bangalore. Resources and methods for learning about these subjects (list a few here, in preparation for your research): DC Machine Basics B) positive. Objective: to examine the design of single-phase transformers; to study the voltage and current ratios of transformers; to study the voltage regulation of the For chemical Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved. They are made from a small cylinder of This leading position results mainly The starting system performs this function by changing electrical energy from the battery to mechanical In this experiment, three different methods are examined for the measurement of Bonneville Power Administration. Steve Laslo For the Hands On Relay School (3-12) Revision 1.1. February 21, 2012 1 You will learn to use a DC power supply, a digital multimeter Inputs- processing- outputs As the current increases, the magnetic flux through a loop due Metals, in general, are good conductors. Why? The property of conductance The paper is lightweight Simple Electronics I: Current Electricity: Electricity as a source of energy, definition of resistance, voltage, current, power, energy and To use this website, you must agree to our Privacy Policy, including cookie policy. It is named after Sir James Swinburne. Swinburne’s test is the most commonly used and simplest method of testing of shunt and compound wound DC machines which have constant flux. In this test the efficiency of the machine at any load is pre-determined. We can run the machine as a motor or as a generator. In this method of testing no load losses are measured separately and eventually we can determine the efficiency. The circuit connection for Swinburne’s test is shown in figure below. The speed of the machine is adjusted to the rated speed with the help of the shunt regulator R as shown in figure. Calculation of Efficiency Let, I 0 is the no load current (it can be measured by ammeter A 1 ) I sh is the shunt field current (it can be measured by ammeter A 2 ) The losses occur in the machine mainly are: Iron losses in the core Friction and windings losses Armature copper loss. Since the no load mechanical output of the machine is zero in Swinburne’s test, the no load input power is only used to supply the losses. Now, no to get the constant losses we have to subtract the armature copper loss from the no load power input. Then, After calculating the no load constant losses now we can determine the efficiency at any load. Let, I is the load current at which we have to calculate the efficiency of the machine. And, when the machine is generating. Calculation of Efficiency When the Machine is Motoring on Load Since constant losses are known, efficiency of Swinburne’s test can be pre-determined at any load. Disadvantages of Swinburne’s Test The main disadvantages of this test are: Iron loss is neglected though there is change in iron loss from no load to full load due to armature reaction. We cannot be sure about the satisfactory commutation on loaded condition because the test is done on no-load. We can’t measure the temperature rise when the machine is loaded. Power losses can vary with the temperature. In DC series motors, the Swinburne’s test cannot be done to find its efficiency as it is a no load test. Click here to see our privacy policy. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Full disclaimer here. Series motors which are mainly used for traction work are easily available in pairs. The two machines are coupled mechanically. Load resistance R is varied till the motor current reaches its full-load value indicated by ammeter A 1. After this adjustment for full-load current, different ammeter and voltmeter readings are noted. The resistance of armature circuit is 0.25 W and the field resistance is 125 W. Calculate the efficiency and output when the motor is loaded and taking a current of 100 A. Each has armature and compole winding resistance of 2.4 W, series field resistance of 1.45 W and total brush drop of 2 V. The p.d. across armature and field was 230 V with a motor current of 10.1 A. The generator supplied a current of 8.9 A at a terminal p.d. of 161 V. Calculate the efficiency and output of the motor for this load. The readings obtained in such a test were as follows; line voltage 100 V; motor current 30 A; generator current 25 A; armature resistance of each machine 0.25 W. Calculate the efficiency of each machine from these results, ignoring the field currents and assuming that their iron and mechanical losses are the same. The armature resistance of each of the machines is 0.05 W. Related documents Chapter 2 Appointment Retirement Removal of Trustees and Fiduciary Nature of Trusteeship Nemo Dat Rule - This is my own note for the topic under the doctrine of nemo dat rule in commercial Malaysian Summary Of Source Of Land Law With Court Cases Application of Civil Law Act EEL2026 Tut-2A Transmission Line Solutions Assignment - Formal Report (Sample) Preview text UEEA 2433 Electrical Machines. Laboratory Marking Guidelines. Item. Criteria. Rubrics. Involvement andUnacceptableAcceptable. ExceptionalAnswer questionAnswers are correct. Lab1, Lab1.2: Week 7 Monday 9am. Lab2, Additional Practical: Week 11 Monday 9am. Report Content. Lab 1: Characteristics of DC. Shunt Motor. Lab 1.2: Characteristics of DC. Compound Motor. Lab 2: Characteristics of. Induction Motor. Additional Practical. Characteristics of. Transformers. Lab 1Acceptable. Exceptional. DC shunt. DC compound. Induction. Transformer:Marginal. Acceptable. ExceptionalThe brake of DC motor strong was connected, andThe motor was found to be started.The field resistor wasIf required, the voltage was readjusted to 200V.At each step, theThe data was entered into. Table 1.Table 1 was completed.Armature current. Power input. Power delivered:Power out:The Characteristics Curves Graph Of DC Shunt MotorThe brake of DC motor strong was connected, andThe motor was found to be started.The field resistor wasIf required, the voltage was readjusted to 200V.At each step, theThe data was entered into. Table 1.Results:If(A)N(rpm)Power input. Power delivered. Efficiency. Power out. Efficiency. Torque, Armature PinSlip rings in AC wound-rotor machines receive continuous energy from sources by slidingSlip rings are part of the rotating structure or rotor. Because of the dynamic rotor and static supply. A system of slip ring and brushes is therefore requiredConclusion. As a conclusion from the experiments conducted, the load characteristics of dc compoundLab 2Output 360 W. Voltage 220 V. Current 3.38 A. SpeedType. Wound Rotor. Ins.Class (B)The connections according to the diagrams of. Fig.1 and Fig.2 were established.As a precaution, the motor was made sure to rotate inAccording to the instruction given, if theWSM6-07) was reduced to minimum of 0V.It is calculated by:Pout and Pin increase almost linearlyMoreover, power factor increase with the increase ofIn the experiment, the induction motor is operating in low slip region which the motor slip increase andNormally, the motor is operate in low slipSlip ring in this experiment is known as an electrical connections that are used to transfer power to andThus, the slip ring normally is used to allow the output current andThe slip ring allows transmission of powerThe windingIf two of the the supply terminals are swapped, the path of current flow are reversed causing ofHence, direction of the rotating magnetic field will changeThe results of the experiment is slightly deviated from expected results. That is because of the defect ofThe value of torque applied the brake are inaccurate. The loss such asAdditional Practical. Objective: To Determine the Characteristics of Transformer. Introduction. A transformer is a static electro-magnetic passive electrical device that takes electricity of one voltageIt works on the principle of induction. They can often be seen onThe fundamentalTherefore, a study on the magnetism and of the conductors in theEquipment:Procedures:AsResults and Discussion. Unloaded. Primary voltage, U1. No-load current, I0. Phase angle. No load voltage, U0. No-load condition is where a transformer’s secondary coil of the transformer is not connected toWhen supplied with primary voltage, this voltage drives a small no-load primaryOhmically loadedPhase angle. Active power, P. Reactive power, Q. Secondary voltage, U2. Power factor. Inductively loadedThere is noA current will flow through the secondaryA magnetic fieldThe type of load and the voltage induced in theThe characteristics ofThe result of this is weaker magnetic strengthThe primary current I1 of transformer under ohmical load has two components, which are the loadThe magnetizing component produces the main fluxMmf N1I2’ balancesYou need a Premium account to see the full document. Option 1 Share your documents to get free Premium access Upload Option 2 Upgrade to Premium to read the full document Get a free 30 day trial Already have an account. Sign in here Help.