A Study on Optimization Development of Cooling Fan Motor for EMC

With the trend of electrification and connectivity, more electrified parts and more integrated chips are being applied. Consequently, potential problems based on electro-magnetic could occur more easily, and interest on EMC performance has been rising according to the degree of electrification. In this paper, one of the most severe systems, cooling fan motor in terms of EMI, is analyzed and improvement methods are suggested for each type of cooling fan. Additionally, an optimized configuration of improvement method for EMC has been derived through analysis and study. Finally, verification and validation are implemented at the system and vehicle levels.

In this paper, the following effects were obtained by analyzing the cooling fan motor system and reviewing and optimizing the design factors from the EMC perspective.

1. (1)
   Analyzing the impact of each EMC reduction device currently applied to the cooling fan motor according to specifications and optimizing the specification combination based on the results. The optimization was applied to the actual vehicle in mass production.
2. (2)
   Checking the relationship between the frequency domain and the operating condition of the cooling fan in terms of the RE/CE performance regulation value for the cooling fan motor and suggesting mitigation of the regulation value by considering environmental condition of the cooling fan to optimize the noise reduction filter specifications. It allows improving profitability by reducing vehicle costs.
3. (3)
   Analyzing all surge-influencing factors in the TE performance regulation of the cooling fan motor and devising a logic based on the results. The system was constructed to satisfy EMC performance without applying any improvement elements or devices, thereby improving profitability.
4. (4)
   The EMC design specifications of other similar parts can refer to the optimization methodology presented in this paper for profitability improvement.