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This paper presents the comparison of two brushless DC motors for the same automotive application. A commercial machine and a new designed motor, both used to power the fan of air conditioning system of automobile. Commercial software for designing machines was used to determine the comparison parameters. The study established the settings of the main parameters influencing the motor optimal operation based on appropriate criteria for the application. The results show that the new designed brushless DC machine presents enhancements in their speed-torque characteristic and a moderate increases in the efficiency with respect to the potential commercial motor for this type of automotive applications.