Electrical Machine

Commutation in DC Machine (Generator or Motor) – Process & Remedies

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When a DC generator is loaded, the current flows through the armature winding, commutator and brushes to the external circuit. During this process, whenever a brush spans the two commutator segments, the winding element connected to those commutator segments is short-circuited. The changes in current direction, which take place in the winding part, just before, […]

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What is Separately Excited DC Generator? Circuit diagram, Characteristics & Advantages

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A DC generator is the most commonly used separately excited generator, used for electroplating and battery charging. A separately excited generator is one in which the magnetic field is excited from an external DC source. The DC source may be a DC generator or a battery or a metal rectifier connected to an AC supply.

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What is Constant Voltage Transformer (CVT)? Working Principle, Diagram & Applications

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A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).

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What is Split Phase Induction Motor? Working, Diagram, Phasor Diagram, Applications & Characteristics

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A Split Phase Induction Motor is a type of single-phase motor that has two windings: a main winding and a starting winding. The primary feature of this motor is its ability to create a phase difference between the currents in the main and starting windings, which helps generate the necessary starting torque. Fig. 1. Split

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What is Star Delta Starter? Working, Diagram, Construction & Advantages

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The Star Delta Starter used to starting the standard squirrel cage induction motors with both ends of each of the three windings brought out (six terminals) are known as star-delta motors. The Star Delta Starter connects the three stator windings in star across the rated supply voltage at the time of starting. After the motor

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