What is Servo Motor?
This is nothing but a simple electrical motor, controlled with the help of servomechanism. If the motor as controlled device, associated with servomechanism is DC motor, then it is commonly…
Variable Frequency Drive or VFD
It is interesting to know that the first A.C. drive (400 HP) based on thyratron cycloconverter-fed WRIM was installed in 1932 by F.E. Alexanderson of General Electric in the Logan…
Dynamics of Electrical Drives
When an electric motor rotates, it is usually connected to a load which has a rotational or translational motion. The speed of the motor may be different from that of…
Control of Electrical Drives
Electrical drives have become the most essential equipment now days in the electrical motors and other rotating machines. We know that electrical drives mainly accomplish three kinds of work, Starting…
Classification of Electrical Drives or Types of Electrical Drives
The classification of electrical drives can be done depending upon the various components of the drive system. Now according to the design, the drives can be classified into three types…
Losses in a DC Machine
[vc_row][vc_column width="2/3"][vc_column_text]Motors convert electrical power (input power) into mechanical power (output power) while generators convert mechanical power (input power) into electrical power (output power). Whole of the input power cannot…
Stator Earth Fault Protection of Alternator
This is to be noted that, the star point or neutral point of stator winding of an alternator is grounded through an impedance to limit the ground fault current. Reduced…
Small and Large Motor Protection Scheme
The electric motor is most essential drive in modern era of industrialization. From fractional hp AC motor used for different home appliances to giant synchronous motor and induction motor of…
Rotor Earth Fault Protection of Alternator or Generator
The rotor of an alternator is wound by field winding. Any single earth fault occurring on the field winding or in the exciter circuit is not a big problem for…
Motor Thermal Overload Protection
For understanding motor thermal overload protection in induction motor we can discuss the operating principle of three phase induction motor. There is one cylindrical stator and a three phase winding…