Ward leonard method of speed control of dc motor uses a motor generator set. As shown in the figure above, m is separately excited dc motor whose speed is to be controlled and g is separately excited dc generator driven by a three phase ac driving motor. Simulation of ward leonard test set and induction motor on. A ward leonard system according to claim 1, in which said resistance comprises a brush cooperating with a contact bank acting as a voltage and current divider and is so designed that the brush when simultaneously contacting with two contacts of said bank and shortcircuiting the resistance step between them, provides an additional regulating. Navy and also used in passenger lift of large mines. All content is posted anonymously by employees working at ward leonard. Ward leonard method of speed control or armature voltage. Pdf an investigation of the ward leonard system for use. Ac ward leonard drive systems illinois institute of. Ward leonard speed control it is combined armature and field control and is therefore, operationally the most efficient method of speed control with a wide range. An investigation of the ward leonard system for use in a hybrid or electric passenger vehicle conference paper pdf available august 20 with 1,948 reads how we measure reads.
Sistema ward leonard maquina universal hampden youtube. When we talk about speed control of dc motor we said that there is ward leonard method of speed control which based on varying the applied voltage to the. Ward leonard control system is introduced by henry ward leonard in 1891. The dc motor armature is fed from a variable voltage and adjustable polarity supply whose current rating must be somewhat higher than that of the motor. Many ward leonard control systems and variations on them remain in use. In this method the speed of the dc motor m 1 is controlled by applying variable voltage across its armature. It helps you to get fully acquainted with the basic concepts and functioning of a dc machines. Sistema wardleonard jose corriente electrica generador electrico. Closedloop control application for a ward leonard block c98a7066a511027619, 0620 3 2 introduction until the early 1960s, a motor generator block the ward leonard block was used for variablespeed drives. The connection diagram of the ward leonard method of. By varying the generator field current, its output voltage will. Ward leonard control, also known as the ward leonard drive system, was a widely used dc motor speed control system introduced by harry ward leonard in 1891.
Ward leonard system can still be found in very large applications where using. Ward leonard control, also known as the ward leonard drive system, was a widely used dc. Wardleonard method of speed control electrical concepts. It involves a prime mover usually an ac or alternating current motor which operates a direct current or dc generator at a consistent speed. Closedloop control application for a wardleonard block. The connection diagram of the ward leonard method of speed control of a dc shunt motor is shown in the figure below. Analisa sistem ward leonard pada rangkaian motor dan. No sistema classico pelo metodo wardleonard, maquinas rotativas eram. Ward leonard method of speed control is used for controlling the speed of a dc motor. Leonard had patents for more than 100 inventions during his lifetime, but is best known for the ward leonard motor control system. Ward leonard control from wikipedia, the free encyclopedia ward leonard control, also known as the ward leonard drive system, was a widely used dc motor speed control system introduced by harry ward leonard in 1891.
One adjustable voltage speed control is the ward leonard. One adjustable voltage speed control is the ward leonard system it uses three from electric 966125 at penn foster college. Ward leonard method of speed control or armature voltage control ward leonard method of speed control is achieved by varying the applied voltage to the armature. Can the ward leonard system of speed control provide. In this method the speed of the dc motor m 1 is controlled by applying variable voltage across its. The generator armature voltage was controlled by changing. Wagner detroit ward leonard wiring diagrams book pdf best of all, they are entirely free to find, use and download, so there is no cost or stress at all. Us3108214a wardleonard motor current overload control. Figure 33 ward leonard speed control this system may be so arranged that the from elec 3 at university of newcastle. This control system is consisting of a dc motor m 1 and powered by a dc generator g. Accordingly, a voltage is developed at the terminals of the generator 24 and, because of the ward leonard arrangement, the generator 24 impresses a voltage across the armature 21 of the motor 14. Ward leonard drive systems, also known as ward leonard control, were widely used dc motor speed control systems introduced by harry ward leonard in 1891. A ward leonard drive system consists of a motor prime mover and a generator with shafts coupled together. Locations in texas, louisiana and connecticut, inquiry forms or call 800.
In early 1900s, the control system of ward leonard was adopted by the u. A dc generator driven by a synchronous motor was used to supply a dc motor. The motor, which turns at a constant speed, may be ac or dc powered. Discover everything scribd has to offer, including books and audiobooks from major publishers. Abstract variable speed drive technology has advanced dramatically in the last 10 years with the advent of new power devices and. In the old days, a ward leonard system applied and used for the speed control of dc shunt electric motors was quite convenient to obtain a variety of speeds and reversing for industrial applications. Headquarters 27501 bella vista parkway warrenville, il 60555 usa 18669ohmite 18669646483. Navy and also used in passenger lifts of large mines. Home decorating style 2019 for ward leonard system pdf, you can see ward leonard system pdf and more pictures for home interior designing 2019 62038 at manuals library.
Ward leonard first described his system in an article in electrical world in. It is necessary to get stability of system so the target can be achieved. The ward leonard control system was widely used for elevators until thyristor drives became available in the 1. Ward leonard control system previously are to get optimization of rotation motor to run generator which voltage generated, is used to run another motor. The aim of this article is to present an approach for teaching the concept of electric machines laboratory using specially designed exercises that can be done using matlab. It demonstrates ward leonard method of dc machine through which one can not only operate but. This article present a matlab based technology to simulate ward leonard test set. Inasmuch as the speed of the motor 14 is directly proportional to its impressed armature voltage. As a very flexible, reliable means of motor speed control, the ward leonard speed control system is unmatched.
1220 210 727 554 1322 1199 222 539 163 621 6 61 1228 1449 246 978 1366 187 457 915 1286 997 315 53 506 1051 939 1045 836 1059 548 1046 872 601 1130 905 1139 254