Swinburnes test is an indirect method of testing of dc machines. Aim, apparatus required, specification circuit diagram, procedure. In this method, the dc machine generator or motor is run as a motor at noload and losses of the machine are determined. Theory the back emf for a dc motor is given by, p nz back emf, e b 60 a the number of poles, p the armature conductors, z and the number of parallel paths, a are constant for a particular machine. In the swinburnes test, the constant rotational loss comprising of core and. Losses and efficiency swinburnes test speed control of dc. Open circuit and short circuit tests on single phase transformer.
The machine is running as a motor at rated voltage and speed. This method is an indirect method of testing a dc machine. This test overcomes the drawback of swinburnes test, which does not take any account of the stray load losses occurring in dc machines under loaded condition. Swinburnes test is the most commonly used and simplest method of testing of shunt and compound wound dc machines which have constant flux.
Swinburnes test of dc machine electrical study app by saru. One of the most important features of the dc motor is that their speed can easily be control according to the requirement by using simple methods. The speed of the machine is adjusted to the rated speed with the help of the shunt regulator r as shown in figure. It is a simple method in which no load dcmachine losses are measured seperately and from this the efficiency at any desired load can be predetermined in advance. The resistances of the armature and shunt field are 0. Scribd is the worlds largest social reading and publishing site. As you know that the construction of any type of dc motor is very similar to a dc generator. To obtain the performance characteristics of a dc shunt motor by load test. In this test the efficiency of the machine at any load is predetermined. Swinburne s test is an indirect method of testing of dc machines. Dc starter face plate type suitable for above motor.
It is a simple method in which no load dc machine losses are measured seperately and from this the efficiency at any desired load can be predetermined in advance. Once the losses of the machine are known, its efficiency at any desired load can be determined in advance. This is also well known that the dc machines can be used as a generator as well as as a motor, their is the difference of operation in both case i. A dc motor is an electrical machine which converts electrical energy into mechanical energy. Geethanjali college of engineering and technology department electrical and electronics engineering swinburnes test on dc shunt machine aim. Swinburnes test of dc machine electrical study app by. Methods of testing direct, indirect brake test swinburnes test hopkinsons test fields test retardation test applications of dc motors.
To conduct sumpner test on two identical single phase transformers and determine their efficiency at various loads. The concept of the speed regulation is different read more swinburnes test swinburnes test is an indirect method of testing of dc machines. We will reject the larger value because it corresponds to unstable operation of the motor. As the test is on noload, it is impossible to know whether commutation would be satisfactory at fullload and whether the temperature rise would be within the specified limits. Feb 24, 2018 thanks for a2a the no load loss in dc shunt motor can be also referred as constant loss of dc shunt motor actually it is the core loss that takes place inside the armature winding but the armature current is very very negligible in no load condi. Speed control of dc shunt motor i armature control method and ii field control method 3.
Introduction, basic principle, types of transformer. To conduct swinburnes test on dc shunt machine and to pre determine its efficiency. Swinburnes test and speed control of dc shunt motor. Swinburnes test for dc machines in this technique, the dc generator or dc motor is run as a motor at no load. Nov 04, 2017 swinburne s testing of dc machines, generator efficiency testing how to test a dc motor. Swinburnes test is the simplest indirect method of testing dc machines. Speed controlling of dc shunt motor by field and armature control 8. In addition to the above eight experiments, at least any two of the experiments from the fo owing list. Electrical machinel dc laboratory manual grietelectrical and. Hopkinsons test is another useful method of testing the efficiency of a dc machine. Machine laboratory swinburnes test is the simplest.
Load characteristics of dc shunt and compound motor. Brake test, swinburnes test, hopkinsons test or back to back test, retardation test or running test, fields test, applications of dc motors. Testing of dc shunt motors in any electrical machine for that matter any equipment finding out its characteristics by actual experiment is very important, because although, it is possible to get some idea about the performance of the equipment from the design data, but experimental validation or testing is essential. Losses and efficiency swinburnes test speed control of dc shunt motor flux and from ce 450 at jntu college of engineering, hyderabad. The test does not work for series motors because they cannot be run at light loads, and because speed and flux vary significantly in series motors. When the losses of dc machine wellknown, then we can find the efficiency of a dc machine in advance at any desired load. One machine runs normally as a motor and drives generator whose output is wasted in a variable load r fig. It is a full load test and it requires two identical machines which are coupled to each other. The working of dc motor is based on the principle that when a current carrying conductor is placed in a magnetic field, it experiences a mechanical force. D c shunt motor make conclusion sd control of dc shunt motor dc shunt motor experiment sd control of dc shunt motor. To know how to estimate and predict efficiency of a d. Swinburne s test is the simplest indirect method of testing dc machines. Jul 30, 2017 swinburne test is usually conducted in no load condition. Determination of efficiency of dc motor by swinburnes test at i rated capacity ii half full load 5.
In this method, the losses are measured separately and the efficiency at any desired load is predetermined. For small machines direct loading test is performed. One of these two machines is operated as a generator to supply the mechanical power to the motor. For large shunt machines, indirect methods are used like swinburnes test. Load test on singlephase transformer and three phase transformer connections. Swinburnes test method for testing dc shunt motor for a d. The connection diagram for dc shunt machine is shown in the. Swinburnes test on dc shunt machine 10 brake test on a shunt motor 11 o. Series motors which are mainly used for traction work are easily available in pairs.
Therefore, mechanical loss can be assumed to remain same from no load to full load. Kothari, tata mc graw hill publishers, 3 edition, 2004. The connection diagram for dc shunt machine is shown in the figure below. Learn everything related to dc motor from this page.
Mar 06, 2019 this method is an indirect method of testing a dc machine. Methods of testing direct, indirect brake test swinburnes test. Speed control of dc shunt motor and swinburnes test on dc shunt motor. Tests on 1phase transformer 12 load test on 1phase transformer. Testing of dc shunt motors electrical engineering ee. To predetermine the efficiency of the given dc shunt machine by swinburnes test as a motor operation and generator operation.
The swinburne test is only applicable for motors where flux is virtually constant, which includes dc shunt and compound motors. Fields test for series motor this test is applicable to two similar series motors. Machines are tested for finding out losses, efficiency and temperature rise. One of these two machines is operated as a generator to supply the mechanical power to the motor and the other is operated as a motor to drive the generator. The field current lf is obtained from an external independent dc source. Study of dc series motor with starter to operate the motor on no load for a moment 4. The biggest advantage of swinburne s test is that the shunt machine is to be. What is the use of swinburne test on dc shunt motor. An electric motor is a devise using electrical energy to produce mechanical energy to produce mechanical power nearly by interaction of magnetic fields and current carrying conductors.
Hopkinsons test this is a regenerative test in which two identical dc shunt machines are coupled mechanically and tested simultaneously. In this method the losses are measured separately and the efficiency at any desired load is predetermined. Mar 16, 2017 swinburnes test is an indirect method of testing of dc machines. Load test on singlephase transformer and three phase transformers. Several paragraphs that explain the motivation of the experiment. Which of the following tests will be suitable for testing two similar d.
Title of the experiment page no 7 retardation test on dc shunt motor. Swinburne s test for dc machines in this technique, the dc generator or dc motor is run as a motor at no load. Theory the efficiency of the dc machine can be accurately determined by the regenerative method, normally known as hopkinsons test. We can run the machine as a motor or as a generator. Motors, electrical engineering multiple choice questions objective type questions, mcqs, with question and answers, download free pdf, electrical engineering, multiple choice questions, objective type questions, electrical engineering short notes, rapid fire notes, best theory. Speed control of dc shunt motor using a armature control and b field control methods. Thus the speed of dc motor is given by, eb v i a r a.
Jun 02, 2015 fields test for series motor this test is applicable to two similar series motors. O it is a simple method in which losses are measured separately and from their knowledge, efficiency at any load can be predetermined in advance. Swinburnes test and predetermination of efficiencies as generator and motor 7. The biggest advantage of swinburnes test is that the shunt machine is to be. Losses and efficiency swinburnes test speed control of dc shunt motor flux and armature voltage control methods. Losses and efficiency in dc machines and transformers condition for maximum efficiency testing of dc machines brake test, swinburne s test, retardation test and hopkinson s test testing of transformers polarity test, load test, phasing out test sumpner s test separation of losses all day efficiency. Swinburne s test is the most commonly used and simplest method of testing of shunt and compound wound dc machines which have constant flux. One of the machines is made to act as a motor driving the other as a generator which supplies electric power to motor. Aug 03, 2018 hopkinsons test is another useful method of testing the efficiency of a dc machine. Thanks for a2a the no load loss in dc shunt motor can be also referred as constant loss of dc shunt motor actually it is the core loss that takes place inside the armature winding but the armature current is very very negligible in no load condi. Download as docx, pdf, txt or read online from scribd.
196 355 1011 669 677 212 138 172 904 283 105 907 153 831 285 301 485 1011 308 122 146 1307 689 916 139 71 375 993 520 99