Remove this presentation Report a copyright infringement Flag as Inappropriate Report a spam I Don't Like This I like this Remember as a Favorite Email this presentation Embed or bookmark. A simple 4 loop, 2 pole dc machine is shown here: This machine has 4 complete loops buried in slots carved in the laminated steel of its rotor. For lap wound machines, the number of parallel paths is equal to the number of poles(A = P). DC motor transforms electrical power into mechanical power and the generator converts mechanical power into electrical. They are explained below in detail. Scribd is the world's largest social reading and publishing site. Bangladesh University of Business and Technology Spring 2019 5 Faraday’s Law Faraday’s Law of Electromagnetic Induction: Whenever a changing magnetic flux acts on a conductor an emf is induced … Thus, this is all about the DC generator. The very basic construction of a DC motor contains a current carrying armature, connected to the supply end through commutator segments and brushes. In a DC machine, developed before the era of power electronics, a mechanical system is used to switch the AC generated loop voltage and give a DC voltage at the terminals of the machine. 3 No-loadcharacteristic VariationofthevoltageE vasafunctionofthe excitationcurrentI e,atconstantspeedandwithno deliveredcurrent î í ì = q= = I0 vitesseconstante Ef(I)avec a ve! • In DC machines, the field winding is wound onto the stator, while the armature winding is located on the rotor. They are lap winding and wave winding. The conductors on the rotor surface are arranged so that the conductor direction is perpendicular to both the direction of motion and the flux path. Information about the position of the rotor is needed to be sent to the driver of the motor. DC machines are the most versatile of all rotating electrical machines. Therefore, construction of a DC motor is same as that of a DC generator. Their speed may be easily adjusted in very fine increments ranging from standstill to rated speed and even above. DC Machine. Shunt Wound Motor. Notation: A1-A2: the armature terminals F1-F2: the shunt field S1-S2: the series field Shunt-field windings Separately excited (use separate DC power supply) Self-excited (operating machine provides its own excitation) 6. This is the most common types of DC Motor. Separately excited DC machine. The voltage induced in a loop formed by the conductors in the simple DC machine shown previously can be obtained by considering the generator equations and the physical arrangement. Get the plugin now . K f is a constant based on machine construction; Φ is the magnetic flux; ω is the angular speed; Maximum Power Condition: The output mechanical power is of shunt dc motor is maximum when the back e.m.f. Rotor – It is the rotating part of the machine. We discuss the construction & working principle of a DC Motor. A DC machine consists of two basic parts; stator and rotor. The DC machine armature windings are always of the closed continuous type of double-layer lap or wave winding. DC Machines-Introduction, Constructional Features: Download: 19: DC Machines- EMF and Torque Equations & Generator Operation: Download: 20: DC Machines- OCC & Load Charactristics Classification: Download: 21: DC Machines - Armature Reaction: Download: 22: DC Machines - Voltage Build-up and Load Characteristics: Download : 23: DC Generator Characteristics and Introduction to DC Motors: … A DC generator or direct current generator is one kind of electrical machine, ... A compound DC generator is used to provide the power supply for DC welding machines. We Offer Hundreds of Free PPT and themes for PowerPoint. The stator in a dc machine is the field part of the machine. Commutation. 3/7/2011 18 Armature Reaction What is meant by armature reaction? The armature has cylindrical steel core that is composed of a stack of slotted laminations. Academia.edu is a platform for academics to share research papers. permanent-magnet DC machines are widely found in a wide variety of low-power applications. The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes. As soon as we supply direct current in the armature, a mechanical force acts on it due to the electromagnetic effect … The efficiency of a dc machine depends upon the losses. Understand EXACTLY how a DC Motor works. Compound DC motors have good starting torque but may experience control problems in variable speed drive applications. • Coils are placed in the slots. Working principle of a DC motor. In large machines, the coils are A SIMPLE explanation of the construction and working principle of a DC Machine (DC Motor or DC Generator). The voltage generated in the armature, placed in a rotating magnetic field, of a DC generator is alternating in nature. The problem for these types is to sense the position of the rotor. produced is equal to the half of its terminal voltage i.e. Pages 197. The field winding is replaced by a permanent magnet, resulting in simpler construction. Theoretically, the same DC machine can be used as a motor or generator. Construction of dc Machines: The rotor in a dc machine is called an armature. • Direct-current (DC) machines are driven from a DC power supply. Compound DC Motors. The above equation represents the general equation for emf induced in a DC generator. DC MACHINE.pdf - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. It has two main parts : Stator – It is the stationary part. Working of DC Motor . Field poles are located on stator and project inward. Outline the principle of operation, construction and testing of single phase transformers. The pole faces of the machine are curved to provide a uniform air-gap width and to give a uniform flux density everywhere under the faces. The armature is placed in between north pole and south pole of a permanent or an electromagnet as shown in the diagram above. For small machines, the coils are directly wound into the armature slots using automatic winders. Here you can download the free lecture Notes of Electrical Machines 1 Pdf Notes – EM 1 Pdf Notes materials with multiple file links to download. Basic constructional parts of a DC machine are described below. In dc machine, the main field is produced by the field coils. It is a term used in dc machines and ac synchronous machines. As the name implies self-excited, hence, in this type of motor, the current in the windings is supplied by the machine or motor itself. 2.1 Construction of a DC Machine The mains parts of a DC machine are Yoke : It is the outermost part of a DC motor or a DC generator. The above figure shows constructional details of a simple 4-pole DC machine. It does not move or rotate. used in rotors and these types are called as Brushless DC Motors Alternate Current Machines 8 (BLDCM). There are several tests to judge the performance of a DC machine. The smaller the losses, the greater is the efficiency of the machine. This preview shows page 1 - 15 out of 197 pages. A DC machine may have either or both; therefore there are several possible types of DC machines. The Adobe Flash plugin is needed to view this content. Find Collection of Free to Download Machine PowerPoint templates. The mechanical switching is acheived … Dc motor stator construction Field poles. DC Machines.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. PPT Dc-machines PowerPoint presentation | online tutorial - id: 7fac0d-ZjE1Z. In a dc generator, a set of conductors or coils placed on a rotating body, called armature, are rotated continuously inside a magnetic field with the help of a prime mover (prime mover is another machine, may be a diesel engine or a turbine, which rotates the armature). Between the 4 types of DC motors, the potential applications are numerous. It is made up of cast iron or steel. DC machine 1.ppt - DC Machine 5 Faradayu2019s Law... School No School; Course Title AA 1; Uploaded By SuperRamMaster106. The armature conductors in a DC generator can be connected in two ways. Specification of DC Machine. Compound DC motors, like shunt DC motors, have a separately excited shunt field. Armature windings are placed in slots. once the terminals of the motor are connected to an external DC supply. Each type of DC motor has its strengths and weaknesses. Let’s think a part of a multipolar DC motor as shown in Fig. 7.1 Introduction and Principle of Working. Self-excited DC Motor is further divided into shunt wound, and series wound motor. Then, The field magnets are excited developing alternate N and S poles; The armature conductors carry currents. A DC machine can be a DC motor or a DC generator. Actions. • Current is supplied to the rotating armature winding through Commutator Segments. Motors and generators are dc machines. Yoke: The outer frame of a dc machine is called as yoke. Output equation of a DC machine is the mathematical expression that relates the main dimension, specific magnetic loading, specific electric loading and speed. )) An electric motor is an electrical machine which converts electrical energy into mechanical energy. PPT on DC machine. Understanding these can help you … Over compound, DC generator is used to reimburse the voltage drop within Feeders. This process is called commutation. 3/23/2007 ELEC A6 DC Machine 9 DIRECT CURRENT MACHINES DC machine Construction • The rotor iron core is mounted on the shaft. • The iron core is supported by a cast iron frame. Level compound DC generator is used to provide a power supply for hostels, lodges, offices, etc. Analyze the losses in dc machines to improve the efficiency by conducting various tests. Electric Motors Alternate Current Machines 9 In some AC motors, Aluminum bars are used as the rotor of the motor. It is made of cast iron or cast steel. • Each commutator segment (also located on the rotor) is connected to an armature winding coil. IV. Slots in laminations are aligned axially along rotor or shaft. DIRECT CURRENT MACHINES DC machine Construction • The picture shows the stator of a large DC machine with several poles. Self Excited DC Motor. 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