The speed control of dc series motor can be obtained by using various methods shown in the figure. Following few facts about the DC series motor should be kept in mind while studying DC series motor speed control. The current flowing through the armature and field winding of a DC series motor is same. The […]
Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a DC motor. The speed equation of a DC motor shows that, N α Eb / φ or N α (V – IaRa)/ φ But the resistance of armature winding is small. Therefore the voltage drops IaRa will be
Types of DC Motor Following are the different types of dc motor: Series DC Motor Shunt DC Motor Compound DC Motor Separately excited DC motors Permanent Magnet DC Motor Series DC Motor The connection for a series-type DC motor is illustrated in Figure 1. A series-wound DC motor consists of a series field winding (identified
The working principle of DC motor can be stated as follows: When a current-carrying conductor is placed in a magnetic field, it experiences a force. In the case of a DC motor, the magnetic field is produced by the field winding. And the armature winding is connected to the external supply voltage hence it plays
Hi friends, In this article, I am discussing the construction of dc motor and hoping you will find it useful. Both the DC machines i.e. DC generator and DC motor have the same construction. Therefore, either machine can be used as a motor or a generator. So the following discussion about the construction of DC
Auto Transformer Working Principle The auto transformer working principle and construction is similar to that of conventional two winding transformers. However, it differs in the way in which the primary and the secondary are inter-related. In a two-winding transformer, primary and secondary are only magnetically linked by a common core but are completely insulated from
There are many types of transformers. These can be classified on a different basis. The following are the main types of transformers. Types of Transformers based on Voltage Level 1. Step-Down Transformer: The transformers having K > 1 i.e. N2 > N1 are known as the step-up transformer. Here, we get high output voltage as compared
The equivalent circuit of transformer is shown in the figure. No load Components The no-load primary current Io has two components, namely Im and Iw. Where Im = magnetizing component = Io sin φo and Iw = core-loss component = Io cos φo. Iw supplies for the no-load losses and is assumed to flow through
Output voltage of a transformer decreases as we put load on it and the voltage will fluctuate with the fluctuation in the load. These unwanted fluctuations in the output voltage cause many problems. This happens due to voltage drop in its winding. When we measure the output voltage of a transformer, without loading it, we
The efficiency of transformer is defined as the ratio of output power to input power. It is denoted by ἠ. As the output power is always less than the input power due to losses in the transformer, practically the transformer efficiency is always between 0 and 1 i.e. 0% and 100% but it can never