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The article discusses the methodology of testing an alternator at a stand to determine its energy efficiency. The efficiency was calculated on the basis of the measurement of the electric power supplied to the drive motor and the power generated by the alternator, taking into account the mechanical and electrical losses of the motor and the belt drive. The efficiency of the machine as a three-phase synchronous generator, without rectifier and voltage regulator, was also determined in order to assess the influence of electronic components on the overall efficiency of the machine. The tests were performed for various rotational speeds and loads. Various physical factors and phenomena that have a negative impact on the efficiency of energy conversion in the vehicle electrical supply system are discussed.
