Tricky but Easy Electrical Engineering!
The major difference between Instantaneous and Definite Time Overcurrent Relay lies in their operating time. The former operates instantaneously while the latter one operates after a definite time. Both Instantaneous and Definite Time Overcurrent Relay senses an over current in the circuit and gives tripping command to operate the circuit breaker for isolation of faulty … Read more
Torque equation of DC Motor gives the amount and nature of electrical torque Te developed whenever it is taken into service. Basically the performance of DC machine centers around two equations. One is EMF equation and another is Torque Equation. Therefore, understanding of torque equation is a must for performance analysis. These equations equally apply … Read more
Definition: AC Generator is an electrical machine which converts mechanical energy into electrical energy. The input supply of AC Generator is mechanical energy which is supplied through some prime-mover and the output is alternating energy in the form of alternating voltage & current. In this post we will discuss AC Generator working and construction. Construction … Read more
We know that torque equation in synchronous motor or generator is directly proportional to the stator filed strength, rotor field strength and the sine of angle between them. This is true for all rotating electrical machine. If Fs, Fr and λ be the stator field strength, rotor field strength and angle between Fs & Fr, … Read more
Definition: AC motor is an electrical device which converts electrical energy into mechanical energy. The conversion of electrical energy to mechanical energy is through a coupling medium of magnetic flux. This magnetic flux is set-up in the air gap of AC Motor. Electrical energy supplied to the stator is first converted into magnetic energy in … Read more
AC system cannot be imagined without Transformer. Starting from power generating station to distribution system, everywhere transformer is used at different levels to step up or step down voltage. Not only this, it is an important and costly element of power system. The cost of a power transformer is in the range of millions of … Read more
In industries, induction motors are more popular and widely used. Especially Squirrel Cage Induction motor is used for various industrial drives and loads due to its rugged design and less maintenance requirement. Synchronous motor applications are not so popular due to requirement separate field excitation source, auxiliaries for starting and control devices. These make it … Read more
Permanent Magnet Synchronous Motor, PMSM is a kind of synchronous motor in which permanent magnet is used as rotor to create field poles. No field winding is wound on the rotor. Construction of Permanent Magnet Synchronous Motor (PMSM): The basic construction of PMSM is same as that of synchronous motor. The only difference lies with … Read more
Switched Reluctance Motor (SRM) is also known as Variable Reluctance Motor. This motor works on the principle of variable reluctance. This means, the rotor always tries to align along the lowest reluctance path. As the name suggests, a switching inverter is required for the operation of Switched Reluctance Motor. Construction of Switched Reluctance Motor Variable … Read more
What is Repulsion Motor? Repulsion Motor is a special kind of single phase AC motor which works due to the repulsion of similar poles. The stator of this motor is supplied with 1 phase AC supply and rotor circuit is shorted through carbon brush. Construction of Repulsion Motor: The main components of repulsion motor are … Read more