There are two types of three phase induction motors viz. squirrel cage motor and slip ring motor. Both have different methods of starting, let see each of these one by one.Squirrel Cage Induction Motor Starting MethodsThe following four methods are available for starting squirrel cage motors −Direct On-Line (D.O.L.) StartingAs ... Read More

In electrical engineering, the power factor of an AC system is the expression of energy efficiency. The power factor (PF) is defined as the ratio of active power (measured in Watts) to the apparent power (measured in VA). The power factor expresses the ratio of true power which is used ... Read More

An SCR is a three-terminal, three-junction, and four-layer semiconductor device that is used to perform switching functions in power circuits.Sometimes the SCR is also called as Thyristor.Constructional Details of SCRThe SCR has three pn – junctions, and four layer of p and n type semiconductor joined alternatively to get pnpn ... Read More

A three phase induction motor has a stator and a rotor. The stator carries a 3-phase winding called as stator winding while the rotor carries a short circuited winding called as rotor winding. The stator winding is fed from 3-phase supply and the rotor winding derives its voltage and power ... Read More

A DC motor is an electromechanical energy conversion device, which converts electrical energy input into the mechanical energy output.The operation of the DC motor is based on the principle that when a current carrying conductor is placed in a magnetic field, a mechanical force acts on the conductor. The magnitude ... Read More

DC GeneratorA DC generator is an electromechanical energy conversion device that converts mechanical power into DC electrical power through the process of electromagnetic induction.A DC generator operates on the principle of electromagnetic induction i.e. when the magnetic flux linking a conductor changes, an EMF is induced in the conductor. A ... Read More

A synchronous motor is not inherently self-starting. Therefore, it requires some auxiliary means of starting. In order to start a synchronous motor, there are following two methods −Starting with an external prime moverStarting with damper windingsSynchronous Motor Starting with an External Prime MoverIn this method of starting a synchronous motor, ... Read More

The torque-speed characteristics of a 3-phase induction motor is defined as the curve plotted between torque developed and rotational speed of the motor. It gives the information about variation in the motor torque with the change in its speed.As the torque of three-phase induction depends upon its speed but the ... Read More

A 3-phase induction motor has two main parts − Stator Rotor The rotor and stator are separated by a small air gap ranges from 0.5 mm to 4 mm depending on the power rating of the motor. Stator of Three Phase Induction Motor The ... Read More

There is a category of transistors called Field Effect Transistor (FET). In this category, a lot of field effect transistors are there like Junction Field Effect Transistor (JFET), Metal Oxide Field Effect Transistor (MOSFET), Metal Semiconductor Field Effect Transistor (MSFET), etc. In this article, we will compare and contrast the ... Read More