Motor Brush Noise
Motor Brush Noise
(OP)
I want to compare 24 volt DC motor brush noise between several motors in order to determine which brush material or capacitor addition gives the lowest EMC emissions?
What instrument could be used for this instead of having to send each motor to an EMC test lab? Once the motor with the lowest emissions are determined that motor would be sent to a lab.
What instrument could be used for this instead of having to send each motor to an EMC test lab? Once the motor with the lowest emissions are determined that motor would be sent to a lab.





RE: Motor Brush Noise
Bill
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"Why not the best?"
Jimmy Carter
RE: Motor Brush Noise
RE: Motor Brush Noise
RE: Motor Brush Noise
The motor mfg will try different things to reduce these emissions and needs a way to compare motors at their facility for the best solution without having to send each one to the lab.
It is a 24 volt DC, series wound motor. Also, need ideas on how to reduce the emissions which are coming from the brushes.
RE: Motor Brush Noise
Once that's set they can screw with brushes and caps and inductors to their hearts content. A large reduction in the noise volume will mean a clear reduction in EMI, worthy of sending back to the test house.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Motor Brush Noise
There are also USB scopes with respectable FFT analysis at quite affordable prices. Some of them will easily measure 50 MHz (not millihertz, please) signals.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Motor Brush Noise
RE: Motor Brush Noise
Thanks to all for your help.
RE: Motor Brush Noise
Keith Cress
kcress - http://www.flaminsystems.com