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Electrical Machines

Basics of AC Induction Motors

S Bharadwaj Reddy
The basic principle of an AC induction motor is that one or more out-of-phase AC (sinusoidal) currents energize sets of electromagnet coils (called stator coils or windings) arranged around the...

Electrical Machines Objective Questions

S Bharadwaj Reddy
Electrical Machines Questions & Answers 1. Magnetic Circuits Principle of Energy Conversion Excited Magnetic Systems 2. Basic Concepts in Rotating Machines Reluctance Motor Doubly Excited Magnetic Systems Elementary Synchronous Machines...

Transformer Open and Short Circuit Tests

S Bharadwaj Reddy
We conduct open circuit and short circuit test on single phase transformer to determine the  efficiency and regulation of a transformer on any load condition and at any power factor.Open...

Transformer Tap Changing Working Principle

S Bharadwaj Reddy
Tap changing in Transformers It is a normal fact that increase in load lead to decrease in the supply voltage. Hence the voltage supplied by the transformer to the load...

Advantages and Disadvantages of Squirrel Cage Induction motor

S Bharadwaj Reddy
Squirrel Cage Induction Motor: Squireel cage induction motors are widely used in industries. Almost 70% of the industrial motors and drives comes under these category. In Squirrel cage induction motors, rotor windings wound in squirrel cage. These...

Squirrel Cage Induction Motor vs Slip Ring Induction Motor

S Bharadwaj Reddy
Advantages of Squirrel-Cage Induction Motors The advantages of squirrel-cage motors compared with the slip ring induction motors are given below (i) They are more robust and cheaper (ii) Comparatively they have  higher efficiency...

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