How to Identifying Motor without Nameplate or Label
Identifying Motors Electric motors with no identification (no name plate or lead tags) must often be maintained and repaired. Follow […]
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Types of synchronous motor starters
Types of synchronous motor starters Manual push button synchronising starter Timed semi-automatic synchronising Automatic starter using polarised field frequency relay
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Motor running cost calculation
Motor running cost calculation In many applications it is worthwhile replacing motors even when considerable working life remains. Motors can
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What is Motor Growler test
What is Motor Growler test? A simple and most common method to test armature winding for short and open coils
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Effects of Frequency on the Generator
First, consider the effects of sustained operation of a generator that is in an emergency island, created as a result
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Types of Motor maintenance and common fault in motor
Introduction The key to minimizing motor problems is scheduled routine inspection and maintenance. The frequency of routine motor maintenance varies
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How motor starters operate
Principle of Motor Starters The principle of operation of a magnetic starters can be better understood by studying the diagram
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Overcurrent Protection of Conductor and Machine
Overcurrent Protection of Conductor Continued over currents increase the resistance heating (I2R) of conductors and can decrease cable insulation life
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Trouble Shooting chart of D.C. Machines
Trouble Shooting chart of D.C. Machines Common defects in commutators A good commutator will have a smooth polished surface dark
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Centrifugal Pump troubleshooting
Centrifugal Pump troubleshooting (1) Failure to start : Gland packing may be too tight. Check whether spindle is freely rotating.
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Maintenance schedule of Electrical Machines in Industries
Types of Maintenance Breakdown maintenance Breakdown maintenance is basically the “run it till it breaks” type of maintenance mode. No
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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