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Design features of power and distribution type transformers
Power transformer 1. Load on the transformer will be at or near the full load through…
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Design of commutator and brushes
The Commutator is an assembly of Commutator segments or bars tapered in section. The segments…
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Design of Armature
The armature winding can broadly be classified as concentrated and distributed winding. In case of…
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Selection of number of poles
As the armature current increases, cross sectional area of the conductor and hence the eddy…
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Real & Apparent flux densities
Although a detailed description of the design of a DC machine is beyond the scope…
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Carter’s Coefficient
Carter’s gap expansion coefficient Where Kgs is called the Carter’s gap expansion coefficient for slots…
Posted inpower system
Machine Models
SYNCHRONOUS MACHINES, i.e. practically all generators together with synchronous motors and synchronous compensators, are the…
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Magnetic Circuit Calculations:
Normally magnetic circuit calculations involve two types of problems. In the first type of problem it is…
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DC Motors
Industrial applications use direct current motors because the speed-torque relationship can be varied to almost…
Posted inDesign of electrical machines
Factors Effecting the Resistivity of Electrical Materials
Factors effecting the resistivity of electrical materials are listed below - 1. Temperature. 2. Alloying. 3. Mechanical stressing. 4. Age…