D.C. Generator

Field Test of DC Series Motor - Advantages & Disadvantages

Generally, Swinburne's test is the most popular testing method of dc machine to determine losses and efficiency. It is an indirect method of testing a dc machine performed without actually loading the machine. Since it is a n…

Brake Test of DC Machine - Advantages & Disadvantages

In the last article, we have seen Swinburne's Test of dc machine, where the efficiency and losses are determined without applying actual load on the machine. It is an indirect method of testing a dc machine. Now let us see an…

Losses in DC Machine - Copper, Iron & Mechanical Losses

In a dc machine, the given input energy will be not equal to output energy i.e., the output energy will be always less than the input energy, thereby reducing the efficiency. The whole electrical input is not available at the mec…

Methods of Reducing Armature Reaction in DC Generator

In the last article, we have seen the phenomenon of armature reaction in a dc generator . There are various effects in the dc generator due to armature reaction. Due to the demagnetizing effect of armature flux on the field flux,…

Armature Reaction in a DC Generator & its Effect

In the last article, we have seen the working principle of dc generator and how we obtained the dc voltage at the output terminal. Now let us see the armature reaction of a dc generator. What is Armature Reaction ? In a dc gen…

Demagnetising and Cross-magnetising Conductors & its Equation

When the field winding of a dc generator is excited, a flux with uniform distribution in the air gap of the dc generator is produced. Once the generator is loaded, load current flows through the armature conductors and set up its…

Commutation in DC Machine - Generator or Motor

It is seen that emf induced in the armature conductors of a dc generator is alternating in nature. The frequency of the induced emf alternates with a frequency corresponding to the product of the speed and the number of pairs of …

Swinburne's Test of DC Machine - Advantages & Disadvantages

For small ratings of dc machines, we can perform the tests directly by loading. In the case of large dc machines, it is difficult to perform tests by loading directly. For this purpose, there are indirect methods of testing a dc …

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