SYNCHRONOUS MACHINE ROTOR TYPES
The magnetic rotor field is generated by a field winding F on the rotor which is fed with an adjustable…
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GRAPH THEORY TERMINOLOGY
Graph theory has many applications in several fields such as engineering, physical, social and biological sciences, linguistics etc. Any physical…
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CONSTRUCTION OF DC GENERATOR
The dc generators and dc motors have the same general construction. In fact, when the machine is being assembled, the…
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SINGLE PHASE AND POLYPHASE SYSTEMS
A system is single or polyphase depending upon whether the sources feeding it are single or polyphase. A source is…
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PRIMARY AND BACKUP PROTECTION
In the event of failure or non-availability of the primary protection some other means of ensuring that the fault is…
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THREE PHASE TRANSFORMER WINDING CONNECTIONS
A three-phase transformer bank can be easily created by using three single-phase transformers. The two sides of these three transformers…
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POWER FACTOR
WHAT IS POWER FACTOR Power factor (PF) is simply the relationship between the active and reactive power on an electricity…
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CONSTRUCTION AND OPERATION OF A SYNCHRONOUS MOTOR
The stator winding of a synchronous motor is similar to that of a 3 phase induction motor. The rotor consists…
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TYPES OF SINGLE PHASE MOTORS
Single phase motors are manufactured in fractional kilowatt range to be operated on single phase supply and for use in…
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REVERSING DIRECTION OF ROTATION OF UNIVERSAL MOTOR
The direction of rotation of a universal motor can be changed by either: (i) Reversing the field connection with respect to…