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1. General heat transfer laws
The various sources of heat generated by an electrical machine are evacuated by means of three transfer modes (figure 1 ):
heat transfer by conduction in the machine structure ;
heat transfer by radiation between each of the structure's walls and the environment;
heat transfer by convection, external or internal, natural or forced, depending on the cooling technology employed. Two main types of machine can be distinguished in terms of cooling technology: closed machines (figure 2 ) and open machines (figure 3 ).
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Conversion of electrical energy
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General heat transfer laws
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