Commutation in D.C. Motors
What is Commutation in DC Motor? Commutation is the process of reversal of current in the short circuited armature coil. […]
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D.C. Motor: Working, Types, Application and their fault
What is D.C. motor? A machine that converts d.c. power into mechanical power is known as a D.C. motor. Its
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Armature Reaction in D.C. Motors
Armature Reaction in D.C. Motors Armature reaction is expected because when current flows through the armature conductors of a d.c.
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Under Excitation Protection in Generators
Introduction Under Excitation Protection in Generators is a critical safeguard mechanism designed to prevent damage to synchronous generators (alternators) when
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Motors used in domestic and industrial service
Domestic uses: Small universal motors of the series type are used in domestic appliances like vacuum cleaners, refrigerators, washing machine,
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Rheostatic Braking of D. C. Series Motor
Rheostatic Braking of D. C. Series Motor Under normal running condition, the armature winding and series field winding are connected
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Direct Loading Test on Single Phase Transformer and Three Phase Induction Motor
Direct Loading Test on Single Phase Transformer The circuit diagram for the direct loading test is shown in the figure.
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Parallel Operation of D.C. Generators (In Detail)
Parallel Operation of Shunt Generator The generators in a power plant are connected in parallel through bus-bars. The bus-bars are
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How to do maintenance of Induction Motor
General Check point and Maintenance of Induction Motor The machine should be stopped and isolated from all supplies before any
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Shaded Pole Induction Motor
Construction of Shaded Pole Induction Motor A shaded pole induction motor is a simple type of self-starting single-phase induction motor.
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Hunting in Synchronous Motor and Cause of Hunting
What is Hunting in Synchronous Motor? The phenomenon of oscillation of the rotor of a synchronous motor about its final
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4-point starter method for DC Motor
4-point starter The functional characteristics of a 4-point starter are similar to a 3 point starter. 4-point starter works as
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3-point starter method of DC Motor
What is Three-point starter A 3-point starter is an electrical device, used for starting as well as maintaining the DC
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Cause of Malfunction in AC machine and Practical solution
Cause of Malfunction in AC machine and Practical solution Overheating of the stator winding of a synchronous machine Cause of
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Auto synchronous motor or Synchronous Induction Motor
A normal synchronous motor rotor having a damper winding arranged such like slip ring IM. On applying 3-phase supply to
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Generator working Principle and How to generator work
Generator Working Principle Electromagnetic Induction in Generator Electromagnetic induction, the basic principle of generator operation, involves the movement of an
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Synchronous motor: Definition, Work, Industrial Application and Comparison
What is Synchronous Motor? Synchronous motors are synchronous machines used to convert electric power to mechanical power. Synchronous motors can
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What is Stepper Motor and their 3 types and Application
What is Stepper Motors? Stepper motor is known by its important property to convert a train of input pulses i.e.,
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Types of single phase induction motors and their diagram
Introduction A standard single-phase induction motor has two windings placed at an angle of 90° to each other. One of
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No load and Locked/Blocked Rotor Test on 3-phase Induction Motor
No load Test on 3-phase Induction Motor This test is similar to OC test of transformer. It is used to
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Types of Generator Protection in Power Plant
Introduction Generators are the most expensive equipment in an ac power system. A 210 MW turbo-generator which includes an alternator,
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Why Dc series motor is never started without load
Why Dc series motor is never started without load We know that the armature current is decided by the load.
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Auto changeover switch of Motor in Industries
Auto changeover of Motor in Industries Induction motors are often used to drive critical loads. In some industrial applications, such
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Induction motor as a generalized transformer
Transformer is a device having two windings which are magnetically coupled & when one winding is excited by AC supply
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What is Back EMF in DC Motor and their Significance
Back EMF in DC generator In generator, when a conductor cuts the magnetic flux, an EMF gets induced in the
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Motor Nameplate details explanation
Nameplate information for all NEMA(National Electrical Manufacture Association) motors Manufacturer There is no defined design for this field, and it
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Starting Method of squirrel cage Induction Motor
Introduction At start the squirrel cage induction motor is just like a transformer with short-circuited secondary and, it will draw
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What is Crawling and Cogging of Induction Motor
What is Crawling? It is observed that induction motors, particularly the squirrel-cage type, some-times exhibits a tendency to run stably
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Speed control of Induction Motor
The speed of an induction motor is given as N = 120f/p (1-S). So obviously the speed of an induction
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Capacitor Start and Capacitor Start Capacitor Run Induction Motor
Capacitor Start Induction Motor The construction of this type of motors is similar to the resistance split phase type. The