Category: Electrical Machines
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AC vs DC Power & Motors – Differences and Benefits
AC and DC power isn’t new and yet it has been two main types of power we are taking advantage of even in the modern age we live in. But did you ever understand the difference between AC and DC … Read more
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What is the difference between a Power transformer and a Distribution Transformer?
Introduction The transformer, in simple terms can be defined as the voltage regulator. It helps in stepping up and stepping down of the voltages. We all have seen transformers in our locality, where the current is passed from higher voltage … Read more
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Factors to consider when selecting a Motor for a particular application
When selecting a motor for a specific industrial application, there are several factors and specifications that you should consider. We look at these factors that will guide you when choosing the appropriate motor for your industrial use. The following are … Read more
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Speed Control of a DC Compound Motor
A compound motor is a combination of a series and a shunt-wound motor. Compound-wound motor (long shunt) Compound-wound motor (short shunt) The Speed-torque characteristics for a compound motor Compound motor characteristics Speed Control of a DC Compound Motor Speed is … Read more
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DC Shunt Motor Speed Control
In the shunt motor, the motor winding is in parallel with the armature. Shunt-wound motor From the figure above, the supply current I = Ia + If . Unlike a series motor, if the load is removed … Read more
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Speed Control of a DC Series Motor
The dc series motor has its windings and armature connected in series across the supply. DC series motor From the figure above, the armature current Ia also supplies the field, hence when Ia is large on starting for … Read more
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Back emf and Torque Equations of a DC motor
Single-loop motor The effect of the force in a magnetic field may be used to cause the rotation of a motor armature. A single loop of a conductor shown in the diagram above has its ends connected to a simple … Read more
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Ideal Transformers
A transformer consists of several coils wound on a common core that usually consists of laminated iron (to reduce eddy-current loss). Transformers are usually used to adjust the values of ac voltages. A transformer can step up or step down … Read more
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Transformers
A transformer is a device used to change the relative amplitudes of voltages and current in an AC circuit. A transformer consists of primary and secondary windings whose magnetic fluxes are linked by a ferromagnetic core. The principle of working … Read more
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Electrical Motors
Motors convert electrical energy into rotational mechanical energy. Electrical motors are used to power many devices used in everyday life like refrigerators, washing machines, elevators, ventilation fans etc. Industrial applications include bulk material handling pumps, rock crushers, machinery operations, compressors, … Read more