Resolved Problems about DC Eletric Generators

Problem 104-2 Source: Example problem 3-3 - page 81 - KOSOW, Irving L. - Book: Electric Machines and Transformers - Ed. Globo - 1st edition - 1977.

Assuming constant field excitation, calculate the no-load voltage of a generator in the independent excitation configuration, whose voltage of armature is 150 V at a speed of 1,800 rpm, when:

a) the speed is increased to 2,000 rpm.

b) the speed is reduced to 1,600 rpm.

Solution of the Problem 104-2

Item a

To solve this problem we will base ourselves on eq. 103-21, shown below

eq. 103-21

Substituting the variables for their respective values and performing the calculation, we get:

E_A₂₀₀₀ = 150 x (2,000 / 1,800 ) = 166.7 V

Item b

Repeating the process, we have:

E_A₁₆₀₀ = 150 x (1,600 / 1,800 ) = 133.3 V

Back to Top

Previous Problem

Next Problem