Low-noise external rotor BLDC motor for fan applications

@article{Lelkes2002LownoiseER,
  title={Low-noise external rotor BLDC motor for fan applications},
  author={Andr{\'a}s Dr.-Ing. Lelkes and Jens Krotsch and Rik W. De Doncker},
  journal={Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)},
  year={2002},
  volume={3},
  pages={2036-2042 vol.3}
}
An important market for brushless DC (BLDC) motors is fan applications, where low acoustic noise is of increasing importance. External rotor motors are especially advantageous for space-saving fan-motor-units. The acoustic noise of the motor can be influenced considerably through commutation strategy. The commutating process has been analyzed using space vectors. Motor noise has been reduced significantly using new modulation strategies. 

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