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What is Servo Motor?

  • Post author:listenlights
  • Post published:February 7, 2018
  • Post category:Electrical Machines
  • Post comments:0 Comments

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…

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Variable Frequency Drive or VFD

  • Post author:listenlights
  • Post published:February 7, 2018
  • Post category:Electrical Machines
  • Post comments:0 Comments

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…

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Dynamics of Electrical Drives

  • Post author:listenlights
  • Post published:February 7, 2018
  • Post category:Electrical Machines
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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…

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Control of Electrical Drives

  • Post author:listenlights
  • Post published:February 5, 2018
  • Post category:Electrical Machines
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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…

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Classification of Electrical Drives or Types of Electrical Drives

  • Post author:listenlights
  • Post published:February 5, 2018
  • Post category:Electrical Machines
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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…

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Losses in a DC Machine

  • Post author:listenlights
  • Post published:October 11, 2017
  • Post category:Electrical Machines/Losses in a DC Machine
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[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…

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Stator Earth Fault Protection of Alternator

  • Post author:listenlights
  • Post published:September 27, 2017
  • Post category:Electrical Machines/Stator Earth Fault Protection of Alternator
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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…

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Small and Large Motor Protection Scheme

  • Post author:listenlights
  • Post published:September 27, 2017
  • Post category:Electrical Machines/Small and Large Motor Protection Scheme
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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…

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Rotor Earth Fault Protection of Alternator or Generator

  • Post author:listenlights
  • Post published:September 27, 2017
  • Post category:Electrical Machines/Rotor Earth Fault Protection of Alternator or Generator
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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…

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Motor Thermal Overload Protection

  • Post author:listenlights
  • Post published:September 27, 2017
  • Post category:Electrical Machines/Motor Thermal Overload Protection
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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…

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