Shunt motor is a special type of dc motor which runs at. Once the losses of the machine are known, its efficiency at any desired load can be determined in advance. Swinburnes test is an indirect method of testing a d. In this test the efficiency of the machine at any load is predetermined. Let us address dc shunt motor, working principle, operational features, speed control, characteristics, load test, and applications of dc shunt motor respectively. When the losses of dc machine wellknown, then we can find the efficiency of a dc machine in advance at any desired load. Methods of testing direct, indirect brake test swinburnes test hopkinsons test fields test retardation test applications of dc motors. This test is mainly applicable for conducting a noload test.
Dc motors plays an important role in energy conversion process. Load characteristics of dc shunt and compound motor. Shunt dc motor the shunt motor is probably the most common dc motor used in industry today. As the constant loss is known the efficiency can be predetermined at any load. Kothari, tata mc graw hill publishers, 3 edition, 2004. The swinburnes test on dc shunt motor is applicable to find the losses in the machine with noload power. Oct 27, 2020 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 and speed control of dc shunt motor.
The main advantages of swinburnes test are as follows. The losses in the motors are armature copper losses. Load test on singlephase transformer and three phase transformer connections. It is a machine which converts electrical energy into mechanical energy. To conduct swinburnes test on dc shunt machine and to pre determine its efficiency. A dc motor is connected in the short shunt configuration, but the series. To predetermine the efficiency of a dc shunt machine when run both as generator and motor. We bulk supply dc shunt motor and dc shunt generator trainer and laboratory equipments in lab tenders as per required specifications. The characteristics of a shunt motor reveal that it is an approximately constant speed motor.
Oct 17, 2019 thus, by the initiation of faradays rules of magnetic induction, a motor is found finally. Swinburne s test is the most commonly used and simplest method of testing of shunt and compound wound dc machines which have constant flux. Lathes, drills, boring mills, shapers, spinning, and weaving machines series motor. Swinburnes test can be carried out on all dc motors. Swinburnes test is the most commonly used and simplest method of testing of shunt and compound wound dc machines which have constant flux. Apr 25, 2018 thus the efficiency of dc motor can be calculated as below. May 04, 2020 brake test on dc series motor theory pdf may 4, 2020 by masuzi pdf brake test on dc compound motor testing of d c machines field s test sd control of dc motor by using pwm laboratory manual electrical machines. For conducting brake test on dc series motor, it must be ensured that belt is sufficiently tight before the motor is switched on to the sully as dc series motor shall not be started at no load. Load test on singlephase transformer and three phase transformers. In dc series motors, the swinburnes test cannot be done to find its efficiency as it is a. S1 power switch to switch on sw1 speed switch and starter switch for armature sw2 speed switch for field winding r1 to r9 wirewound high power resistors for the starting of the motor sw2 must be on position 0. Speed control of dc shunt motor with field and armature.
Dc series motor is not advisable to start at noload so, this test cant be. In this method, the no load losses of the machine are determined experimentally and the additional losses on load are estimated from the known data of the machine, and with the help of the losses and input power the. Is it possible to conduct swinburnes test on dc series motor. Open circuit characteristic occ of dc shunt generator 2. Thus, this method is an economical and convenient method of testing of dc machines. Speed controlling of dc shunt motor by field and armature control 8. But, as series motor cannot be started on noload,these tests cannot be conducted. Dc shunt machine is the best option for conducting no test. Speed control of dc motor by varying armature and field resistance speed control of dc motor by using ward leonard method of speed control load characteristics of dc shunt generator. In this method, the dc machine generator or motor is run as a motor at noload and losses of the machine are determined. Scribd is the worlds largest social reading and publishing site. The coils in the shunt field are composed of many turns of small wire, resulting in low shunt field current and moderate armature current. Circuit, calculations and its applications elprocus. Swinburnes test is the most commonly used and simplest method of testing of shunt and compound.
Swinburnes test and hopkinsons test are commonly used on shunt motors. Dc machines multiple choice questions on swinburnes test. Swinburnes test is the simplest indirect method of testing dc machines. Testing of dc machines direct and indirect tests swinburne. The power required to test a large machine is small. It is a type of motor that is used for constant load. Title of the experiment page no 7 retardation test on dc shunt motor. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. Components of the shunt motor are the armature, labeled a1 and a 2, and the field, labeled f1 and f2. These losses are calculated separately and efficiency can be predetermined. Swinburnes test is an indirect method of testing of dc machines. In this method, the losses are measured separately and the efficiency at. Therefore, mechanical loss can be assumed to remain.
No load test less power consumed efficiency can be predetermined for both motor and generator 3. Generally, this test can be done for the low rated dc machines. 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. 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. Direct load test on dc shunt motor theory march, 2020 by masuzi testing of d c machines brake test load test on dc shunt motor testing of dc machines electric equipment how to load test on a 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. But, as series motor cannot be started on noload,these tests cannot be conducted on. Swinburnes test and predetermination of efficiencies as generator and motor 7. Dc generators testing of dc machine swinburne s test of dc machine hopkinsons test in compound wound dc generators both the ee2259labmanual. 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. During the noload test, the current directly appears across the field winding of the dc series machine which results in the burning of. Open circuit and short circuit tests on single phase transformer.
The brake test is the one kind of load test on dc shunt motor. Oct 25, 2020 a dc shunt motor also known as a shunt wound dc motor is a type of selfexcited dc motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor. Dec 07, 2016 the swinburne test is only applicable for motors where flux is virtually constant, which includes dc shunt and compound motors. The losses in the motors are armature copper losses, iron losses in the core, friction losses, and winding losses.
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