Unbalanced Anemometer Turbine

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  • Updated 5 months ago
I just unpacked a new 01024M with the 0614 sensor suite. In my fooling around with my new toy, I noticed that one of the cups on the anemometer turbine is quite a bit heavier than the others, with the heavy one seeking out the low point when the unit is held with the anemometer axis horizontal, even to the point of reversing rotation repeatedly to place the "heavy" cup at the bottom as it swings like a pendulum.  As a mechanical engineer, I can't think of any reason that a turbine should be unbalanced.  Is this normal?  Should I remove some material from the heavy cup?  Add a bit of mass to the others?  Get a new wheel?

Thank you for your time.

ed_watts@verizon.net
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Ed Watts

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Posted 5 months ago

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George D. Nincehelser

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It should be balanced.  Is there any excess flashing or something on the cups?

The shaft turns a magnet over a reed switch... perhaps the magnet is settling over the switch?  I've never noticed it myself, but I seem to remember someone saying they had a similar issue in the past.

If there's a manufacturing fault, they may send you a new set of cups or a new wind module.
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Wayne Webb

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I have an old one and checked it out. it worked fine for several years and it is also has a heavy side. Looks like one lighter cup than the other 2.  The data it produced tracked very closely to data from a Davis Vantage Pro. the 2 gages  are mounted within 10 feet of one another. 
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Ed Watts

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No, no flashing or anything obvious.  I was able to [statically] balance the device by attaching bits of Gorilla Tape® to the backs of two of the cups.  I can now spin the shaft and the cups end up in random positions when the rotation stops.  It does seem, though, that the unit should be in better balance from the factory.