Shunt motor with electrical and torque characteristics. At last i plot the graph about efficiency of dc shunt and series motor individually. Voltage equation of a motor conditions for maximum power torque armature torque of a motor shaft torque speed of a d. Dc motors moteurs a courant continu gleichstrommotoren type dmi. In electrical terminology, a parallel connection is called shunt. It is clear that a speed of a shunt motor is sufficiently constant. Performance characteristics of dc generators objectives. Speed control of dc shunt motor with field and armature. Compound motor characteristics basically depend on the fact whether the motor is cumulatively compound or differential compound. Electrical machinel dc laboratory manual grietelectrical and. Dc motor generator set, voltmeters, ammeters, tachometer, rheostat, required number of connecting wires name plate details.
These are explained below for each type of dc motor. Shuntwound motors are used in industrial and automotive applications where precise control of. With a dc compound motor, the majority of the field is wound for a shunt field but with a few turns of series winding on top. Dc motorgenerator set, voltmeters, ammeters, tachometer, rheostat, required number of connecting wires name plate details. Applications of dc machines motors and generators circuit. Direct current motors up to to 2,000 kw and 1,000 v. N vol tag e am ps i l speed s n rpm spring balance readings torqu e t.
Learners examine the operation of a dc shunt motor and its characteristics. In this article we will discuss about the characteristics and performance curves of dc shunt motors. This motor is used when both a high starting torque and good speed regulation is needed. On the other hand, back emf reduces marginally more than that the speed of the shunt motor decreases to some extent with load. The shunt field windings of a dc shunt motor are made of smaller gauge wire, but they have many more turns than a serieswound dc motor. A shunt motor has slightly different operating characteristics than a series motor. Selfexcited dc motor is further divided into shunt wound, and series wound motor. The three important characteristics of dc generator are 1. Has run great for years,then one morning the workhead wouldnt run. The dc shuntwound motor is used in applications where load varies and it is necessary for the motor so self regulate speed. Jul 11, 2019 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. Determination of critical field resistance critical speed. Shunt wound motors are used in industrial and automotive applications where precise control of speed and torque are required. Hence the armature current differs and the speed of a dc shunt motor will continue constant which is shown in the fig dotted line ab.
Three digital multimeters, a set of sheathed banana cables and a power quality meter from the stockroom. Field rheostat provides above normal speed and armature rheostat provides wide range of below normal speed. This provides a motor with a combination of the shunt and series characteristics. If applied voltage v is kept constant, the field current will remain constant, hence flux will have maximum value on no load but will slightly decrease due to. You can see information on wound field dc motor designs and ratings here. A cumulative compound motor is capable of developing a large amount of. May 24, 2015 comparison of shunt and series motors a shunt motors. Open circuit characteristic or magnetization curve or no load saturation curve open circuit characteristic is the relation between the noload generated emf in the armature, and the field exciting current at a fixed speed. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. Equivalent circuit parameters are armature resistance ra 110 ohms, field resistance rf 2. To obtain the external characteristics of dc shunt and compound generators. An advantage to a separately excited shunt field is the ability of a variable speed drive to provide independent control of the armature and field. Mod01 lec30 lecture30characteristics of dc shunt motors.
Cumulative compound motor combines the operating characteristics of the series andshunt motors. Shunt motor definition and meaning collins english. Set the inserted field resistance and the inserted armature resistance to their maximum values. Dec 29, 2015 the shunt field windings of a dc shunt motor are made of smaller gauge wire, but they have many more turns than a serieswound dc motor. In dc series motor field exciting current is equal to armature current which is nothing but a load current. As resistance increased, the value of the field current will reduce.
First, one is separately excited dc motor and selfexcited dc motor. The shunt is connected across the field supply and the series turns are connected in series with the armature. Though there are separate branches for the flow of armature current and field current. Shunt motor definition and meaning collins english dictionary. Table 11 lists application and electrical operating rating data for.
Sep 30, 2012 compared to the shunt motor, the series dc motor hashigh starting torque and poor speed regulation 3. It is a machine which converts electrical energy into mechanical energy. To conduct load test on dc shunt generator and to draw the external and internal characteristics of dc shunt generator. Types of dc motors and their applications electrical4u. The characteristics of a shuntwound motor give it very good speed regulation, and it is classified as a constant speed motor, even though the speed does slightly decrease as load is increased. Shunt motor with electrical and torque characteristics simulink. As the name implies selfexcited, hence, in this type of motor, the current in the windings is supplied by the machine or motor itself. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. The various applications of dc shunt motor are in lathe machines, centrifugal pumps, fans, blowers, conveyors, lifts, weaving machine, spinning machines, etc. The dc shunt wound motor is used in applications where load varies and it is necessary for the motor so self regulate speed. Deviating direct current motor cooling types or protection classes can be created without problems. When the motor is starting and speed is very low, the motor has very little torque. All the characteristics of the compound motor are the combination of the shunt and series characteristics. A shuntwound dc motor has a decreasing torque when speed increases.
It is switched on by a lever type limit switch when the table moves toward the part. Since the shunt field coil is made of fine wire, it cannot produce the large current for starting like the. Analysis of the mechanical characteristics and determination. Power supply module 120vac, 0120vdc ems 8821 dc metering module 200v, 5a ems 8412 dc motor generator module ems 8211 connections leads ems 8941. The high torque capability of the series wound dc motor is some whatcompromised by its tendency to overspeed at light loads. Objective to study the torque vs speed characteristics of a shunt wound dc motor. In a shunt motor, the field and armature windings are connected in parallel. Mod01 lec30 lecture30characteristics of dc shunt motors nptelhrd. When a shunt dc motor reaches its full speed, the armature current is directly related to the motor load. The shunt motors are used where constant speed is required and starting conditions are not severe. A compound dc motor connects the armature and fields windings in a shunt and a series combination to give it characteristics of both a shunt and a series dc motor.
Connect the load rack to the circuit and with the same load resistor value used in characteristic of a shunt generator measure the generator speed n, terminal voltage v t dc, load current i l 10 a scale, dc. Power supply module 120vac, 0120vdc ems 8821 dc metering module 200v, 5a ems 8412 dc motorgenerator module ems 8211 connections leads ems 8941. Installation instructions for shunt trip for ndb, nd, hnd, ndc, nw, hnw, nwc cir cuit breakers, series c molded case switches, and motor circuit protectors hmcp. This paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations.
Got a 273a heald id grinder with a 220vdc shunt wound motor on the workhead. Characteristic of dc shunt generator the circuit diagram of a dc shunt wound generator is shown in the above fig. The selfexcited motors are further classified as shunt wound or shunt motor, series wound or series motor and compound wound or compound motor. A brushed dc electric motor is an internally commutated electric motor designed to be run from a direct current power source. But using field and armature rheostat control method we can make it more versatile. Swinburnes test and speed control of dc shunt motor. Whenever the shunt motor load is increased e b vi a r a and flux reduces as a result drop in the armature resistance and armature reaction. This kind of winding is called shunt winding and the motor shunt dc motor creation and principle of operation of a shunt dc motor is same as any other dc motor. The armatures torque increases as the motor gains speed due to the fact that the shunt motors torque is directly proportional to the armature current. Motor characteristics electrical engineering assignment. The compound motor is a motor which has both shunt and series field. The motor characteristics are graphed for speed, horsepower and torque.
To obtain the performance characteristics of a dc shunt motor by load test. The field winding can be separately excited or connected to the same source as the armature. A shunt motor is a direct current motor whose two windings are in parallel, with the. Working principle from the above circuit diagram, we can conclude that if we want to increase the speed of the shunt motor, we will vary the field resistance. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and dc distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. The compound motors are used where higher starting torque and fairly. Since load is very small in a shunt motor, armature current is also very low. Following relations are worth keeping in mind while discussing motor characteristics. A shuntwound motor has good speed regulation, and it is classified as a constant speed motor, even though the speed does decrease slightly as load is increased. Once the motor reaches its full speed, it remains constant. Lathes, drills, boring mills, shapers, spinning, and weaving machines series motor. 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. I am given below the tables about dc shunt and series motor. Motor motor characteristics characteristics of series motors characteristics of shunt motors.
The characteristics of a dc shunt wound motor give it very good speed regulation, and it is classified as a constant speed motor, even though the speed does slightly decrease as load is increased. When the direction of shunt field flux and series field flux is the same that means flux of one. It is the magnetization curve for the material of electro magnets. Discussion the speed of any dc motor depends mainly upon its armature voltage and the strength of the magnetic field. Speed control of dc shunt motor with field and armature rheostat control 79 2. The shunt connected motor offers good speed regulation. A comparison of the torquespeed characteristics for five different motor types. A dc shunt motor also known as a shunt wound dc motor is a type of self excited dc motor where the field windings are shunted to or are. Shunt wound dc motors run at a constant speed regardless of the load. So applying both methods simultaneously, we can obtain wide. Geethanjali college of engineering and technology department electrical and electronics engineering list of experiments s. In that the armature current ia ruptures up into 2 parts. Each type has unique operating characteristics and.
A shunt wound dc motor has a decreasing torque when speed increases. To determine the efficiency of the given dc shunt motor by conducting load test. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. To draw the performance characteristics of the given dc shunt motor by conducting load test. The high number of turns allows a strong magnetic field to be generated, but the smaller gauge wires provide a high resistance and limit the current flowing through the shunt coil. In a compound dc motor, the series field flux and shunt field flux may oppose each other or may support each other depending on the relative connection between these two fields.
All motors have been sized for roughly the same mechanical power rating. Shunt motor is a special type of dc motor which runs at. In a shunt dc motor, the armature and field windings are linked in parallel. Magnum ds breaker control device voltages and application data. Compared to the shunt motor, the series dc motor hashigh starting torque and poor speed regulation 3.
Characteristics of dc motors through equations eeebooks4u. Dc shunt wound motor application and operation engineers. Reverse the induction motor shunt field connection if the generated voltage is substantially below the rated voltage of about 210 volts. Load characteristics of the machine can be broadly classified into. Dc shunt wound motor application and operation engineers edge. Pdf electrical engineering question and answers muhammad. With good characteristics and performance, the separately or shunt excited dc motor is widely used in the laboratory and on the precision machine tool in factory. Types of dc motor a direct current motor, dc is named according to the connection of the field winding with the armature. Shunt motor is a special type of dc motor which runs at a constant speed. To select the motor type, rightclick on the electric motor block, select variantoverride using and then the desired motor. Common uses of the shunt motor are machine shop lathes, and industry process lines where speed and tension control.
Generally, three characteristic curves are considered important for dc motors which are, i torque vs. Electrical machines for mechatronics laboratory 6 4 altering the armature voltage procedure using the lab equipments shown in figure 6. The different characteristics have been discussed in art. For better application, this paper first analyses the mechanical characteristics of the separately or shunt exited dc motor, and theirs difference was drawn by comparing. Jul 10, 2012 mod01 lec30 lecture30 characteristics of dc shunt motors nptelhrd. Measurement of efficiency of shunt and series motors. The characteristics of a shunt motor reveal that it is an approximately constant speed motor. If the shunt field winding is only parallel to the armature winding and not the series field winding then its known as short shunt dc motor or more specifically short shunt type compound wound dc motor. Motors plays an important role in energy conversion process. When running on noload, a small armature current flows to supply the field and to drive the machine against the friction and other losses in it. The decreasing torque vsspeed is caused by the armature resistance voltage drop and armature reaction. Shunt motor has different speed characteristics from a series motor. To obtain the noload magnetization characteristics. Motor characteristics series and shunt worldofmachines.
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