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Archive - November 2021

  • Electrical

Frequency of Induced EMF in Rotor

November 30, 2021
by Santhakumar Raja
2 min read
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The frequency of induced e.m.f in the armature conductors depends upon speed and the number of poles. Let, N = rotor speed in r.p.m P = number of rotor poles. f = frequency of induced e.m.f in Hz. Consider a stator conductor that...

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Sectional view of a salient pole alternator
  • Electrical

Alternator Construction and Working – theteche.com

November 30, 2021
by Santhakumar Raja
4 min read
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An alternator has 3 phase winding on the stator and D.C field winding on the rotor. Stator It is the stationary part of the machine and is built up of sheet-steel laminations having slots, on its inner periphery. A 3 phase...

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Salient pole rotor
  • Electrical

Introduction of Synchronous Machines – theteche.com

November 29, 2021
by Santhakumar Raja
4 min read
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The machine which produces 3 phase power from mechanical power is called an alternator or synchronous generator. An alternator works on the same fundamental principle of electromagnetic induction as a D.C generator, when the flux...

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Operation of single phase
  • Electrical

Operation of Single Phase Induction Motor

November 27, 2021
by Santhakumar Raja
3 min read
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The stator winding of a single phase induction motor is connected to single phase AC supply. Then a magnetic field is developed in the stator whose axis is always along the axis of stator windings. With alternating current in the...

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Single Phase Induction Motors
  • Electrical

Single Phase Induction Motors – Introduction

November 26, 2021
by Santhakumar Raja
2 min read
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The single phase induction motors are small motors. These motors have power rating in fractional horse power range. These motors are used in homes, offices, shops and factories. They provide motive power for fans, washing...

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Primary Resistor
  • Electrical

Speed Control of Three Phase Induction Motor

November 25, 2021
by Santhakumar Raja
5 min read
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The speed of an induction motor can be controlled by two major methods. They are: Stator side control Rotor side control The first method is applicable for both squirrel-cage and wound-rotor motors. The second method can be...

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  • Electrical

Starting of Three – Phase Induction Motor

November 25, 2021
by Santhakumar Raja
5 min read
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When 3- Φ Induction motor is switched on at normal supply voltage, heavy current “ill flow through the motor because at the time of starting, there is no back emf. An induction motor, when directly switched on, takes five...

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Three Phase Induction Motors
  • Electrical

Three Phase Induction Motors – Introduction

November 24, 2021
by Santhakumar Raja
3 min read
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Three phase induction motors are extensively used for electric drives. The main advantages which make it so popular for industrial use are: It is simple and extremely rugged construction. High reliability. Low cost. Its ability...

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Three Phase Transformers
  • Electrical

Three Phase Transformer Connections – theteche.com

November 23, 2021
by Santhakumar Raja
4 min read
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The generation of electric power is three-phase in nature and the generated voltage is 13.2kV, 22kV or higher. Transmission of power is carried out at high voltages like 132kV or 400kV. Before transmission, it is required to...

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  • Electrical

All Day or Energy Efficiency of Transformer

November 23, 2021
by Santhakumar Raja
2 min read
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The ordinary or commercial efficiency of a transformer is defined as the ratio of output power to the input power. There are certain types of transformers whose performance can not be judged by this efficiency. For instance...

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