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  1. skan99

    Motor+Fan, BPF(+ - 1*RPM)

    Could you explain a little bit in detail? Thanks
  2. skan99

    Motor+Fan, BPF(+ - 1*RPM)

    I am a pretty begineer in the area of motor and fan system. It has 3 blades and 60Hz BLDC motor. The operating speed is 800RPM. There are the higher tonal noises at each BPF and sidebands(320+-13Hz(=operating speed)) of 8th harmonics of the BPF. Is there anyone who can explain about the causes...

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