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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
close this folder3. Execution of rotating electrical machines
View the document3.1. Size
Open this folder and view contents3.2. Designs
Open this folder and view contents3.3. Degree of protection
close this folder3.4. Cooling
View the document3.4.1. Cooling category
View the document3.4.2. Cooling category designation
Open this folder and view contents3.5. Mode of operation
View the document3.6. Heat resistance categories
Open this folder and view contents3.7. Connection designations of electrical machines
Open this folder and view contents3.8. Rotating electrical machines in rotational sense
View the document3.9. Rating plate
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer
 

3.4.1. Cooling category

Undesired heat development results from the joule heat in the windings. The winding insulation can be damaged and the machine destroyed if the permissible conductor temperature is exceeded. Consequently, adequate heat dissipation facilities must be provided.

Cooling category signifies the manner in which heat is dissipated.

We differentiate between the following cooling categories:

self-cooling:

The machine is cooled through air motion and radiation without resorting to a ventilator.

natural cooling:

The cooling air for the machine stems from a ventilator attached to the rotor.

separate cooling:

The machine is either cooled through a ventilator which is not driven by the machine shaft or, alternatively, by means of another separately moved coolant instead of air.

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