D.C. Motor

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 …

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 …

3 Point Starter - Construction, Working & Drawbacks

A dc motor is basically self-starting, it doesn't require any starting device. But in order to start the motor in a desired safe way, there is a need for an external device called 'Starter'. A dc motor can start…

4 Point Starter - Construction, Working & Disadvantage

In a recent article, we have seen the construction and working principle of a three-point starter. The disadvantage of a three-point starter is that due to the series connection of field winding with the no-volt coil (NVC).…

Characteristics of DC motors - Shunt, Series & Compound

The dc motors are widely used in various applications like variable-speed drives, constant-speed drives,  and many more. For selecting a type dc motor for a particular application it is very important to study the character…

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 t…

Types of DC Motors - Shunt, Series & Compound Motors

Basically, there is no difference in the construction of a dc motor and dc generator. A dc motor gives a mechanical output with input as a dc supply while the dc generator gives dc electrical output with mechanical input. S…

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