Noise levels in VFD motors
Noise levels in VFD motors
(OP)
Recently, I saw 2 VFD driven 1000 HP motors running with a howling noise.
Is there any standard for the noise levels specifically for VFD driven motors ?
What is the accepted noise level ?





RE: Noise levels in VFD motors
There were older VFDs with GTOs that were running at low carrier frequencies. They often had resonances in things like connection box cover and other parts. Acoustic foam inside helped a lot.
There is also a new generation with IGBTs where switching frequency has been taken down to 1.6 kHz and thereabout to reduce switching losses, bearing damage and EMI. They also howl. Foam sometimes helps here, too.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Noise levels in VFD motors
These were ID fan motors and no doubt the ducting play a part.
Could tell me the european std no. ?
Most of the industrial equipments are supposed work under 70 dB. Is there an exemption for VFD motors ?
RE: Noise levels in VFD motors
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Noise levels in VFD motors
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Noise levels in VFD motors
RE: Noise levels in VFD motors
RE: Noise levels in VFD motors