What are the important parts of DC machine? Construction wise DC machine has four main parts namely field magnet, armature, commutator and brush. Actually a DC machine means a DC motor or a DC generator constructionally both are same. If rotor of a DC machine is rotated through means of Read more…
Construction of single-phase transformers- A single-phase transformer consists of two winding, called primary and secondary windings mounted on a magnetic core. To confine flux to a definite path magnetic flux is used. Transformer cores are made from thin sheets (called lamination) of high-grade silicon steel. The laminations reduce eddy-current loss Read more…
Shaded pole starting of a single phase induction motor- The single phase induction motors are self starting by providing additional flux by some additional means. Now we depending upon these additional means the single-phase induction motor classified as shaded pole induction motor.The single phase induction motors are self starting by providing Read more…
The power losses in an induction motor fall in the same general classification as in any dynamo. There are electrical losses due to heat produced by the current in the stator and rotor winding, which is called copper loss, magnetic losses in the iron due to hysteresis and eddy currents, Read more…
Unlike the direct current motor, in an induction motor there is no electrical connection to the rotor, circuit and therefore, the same condition exists as in the DC motor i.e., the rotor conducts carry current in the stator magnetic field and thereby have a force exerted upon them tending to Read more…
Alternator is an electrical dynamic device which converts mechanical energy to electrical energy form. According to faraday’s 1st law either magnet or armature must be in motion condition to induced emf. Alternator is also known as synchronous generator. We can categorize Alternator in many ways, but according to the design Read more…
The D.C. generators and D.C. motors have the same general construction. Any d.c. generators can be run as d.c. motor and vice versa. A d.c. machine consists of two main parts- Stationary parts-It is designed mainly for producing a magnetic flux. Rotating part- It is called the armature, where mechanical Read more…
Introduction- Although a far greater percentage of the electrical machine in service are AC machines, the DC machines are of considerable industrial importance. The principle advantage of DC machine, Particularly the DC motor, is that it provides a fine control of speed. However, DC generators are not as common as they Read more…
A relay is a device that opens or closes an auxiliary contact under some predetermined condition in the main circuit. It also provides complete electrical isolation between the control circuit and power circuits. Main parts of relay are armature contacts and coil. it has normally open (NO) contact which can Read more…