: New Product
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Dec 09, 2012
, 10:22 PM
Joined Nov 2012
Someone asked me about balancing outrunner EDF units. I recently repaired my Ramtec EDF and ran it through the Vortex to check balance.
The first thing you will notice is that the imbalance signal has a shaky waveform. The "shakes" is due to the commutation frequency of the motor. Hidden behind the shakes is the rotor imbalance.
After applying the filter, the commutation is mostly removed and the imbalance signal remains. It is not possible to totally eliminate the commutation as it has already exceeded the limits of Vortex. But you can see what is happening.
After balancing the vibration amplitude was reduced from 10mv down to 6.5mv. This indicated that the Ramtec was fairly well balanced. I could tweek it much more though but this post is to demonstrate the commutation effects.
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Ramtec EDF Setup
Original vibration before filtering
Original vibration after filtering
Vibration after final balance weight applied