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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
Open this folder and view contents3. Execution of rotating electrical machines
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
close this folder6. Direct current machines
View the document6.1. Constructional assembly
Open this folder and view contents6.2. Operating principles
Open this folder and view contents6.3. Operational behaviour of direct current machines
close this folder6.4. Circuit engineering and operational features of customary direct current generators
View the document6.4.1. Separate-excited direct current generator
View the document6.4.2. Direct current shunt generator
Open this folder and view contents6.5. Circuit engineering and operational features of customary direct current motors
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer
 

6.4.2. Direct current shunt generator

Circuitry

The direct current shunt generator is a direct current generator in which the exciter winding is switched parallel to the rotor winding.


Figure 102 - Circuitry and terminal board of a direct current shunt generator

(1) Clockwise, (2) Anti-clockwise

Voltage behaviour

The dependence of terminal voltage U on load current I can be deduced from the curve in Figure 103. Terminal voltage declines as load current increases. If the generator is, in addition, loaded over and beyond the rated current, the terminal voltage declines sharply. Only minimal voltage is induced where the rated current increases threefold. Consequently, the required current power need no longer be provided. Terminal voltage is zero during short-circuiting.


Figure 103 - Voltage curve of a direct current shunt generator

1 U0 in no-load operation
2 Short circuit current

The shunt generator is short-circuit-proof.

Voltage control

An alteration of the strain field actuator of the exciter current and, thus, also of the exciter flow serves to ensure constant voltage given greater load current.

Application

The direct current shunt generator is used as exciter generator in three-phase generators for ensuring power supplied on ships and planes.

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