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Author Topic: Electric pendulum  (Read 95 times)
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kit
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« on: October 05, 2017, 03:00:45 AM »

It's been on and off the back burner and taken a couple of false starts on the elctronic s but I actually have a moving pendulum prototype for what will ultimatel y become my GPS locked wooden clock!
Here's a quick video of where I'm up to.

Kit

https://vimeo.com/236876727
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ArtF
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« Reply #1 on: October 05, 2017, 06:36:49 AM »

Kit:

 Awesome. A great video and a great explanati on. Keep us informed.

Art
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Thanks, have fun,
Art
BobL
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« Reply #2 on: October 05, 2017, 08:33:31 AM »

Nicely done Kit, first GPS synced pendulum clock I've seen. Congratz. .

Cheers
Bob
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kit
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« Reply #3 on: October 06, 2017, 06:52:00 AM »

Thanks for the kind words gents.

I did a few calculati ons to compare the efficienc y of this pendulum to my Sextus clock. It's not good!

Weight driven Sextus:
Runs for approx 30 hours on energy supplied by a 3Kg weight falling 1m.
Total energy expended = 3Kg x 1m x 9.81N/m = 30 Joules
Time = 30 x 60 x 60 = 108000 seconds
Average power = 30 Joules/ 108000 seconds = 0.28milli Watts

Electric pendulum:
Draws 2Amps from a 12Voly supply for 25mS every second.
Average power = 2A x 12V x (25/1000) = 600milliW atts

A few more calculati ons reveal that at least 98% of the power delivered to the solenoid of the electrc clock is lost as heat in the resistanc e of the coil. However, construct ion of a supercond ucting solenoid is NOT on my agenda... Yet. None the less, as the ultimate plan is to power the clock from a solar panel I think its carbon footprint will be within acceptabl e limits.

Kit
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ArtF
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« Reply #4 on: October 08, 2017, 09:07:10 PM »

>>However, construct ion of a supercond ucting solenoid is NOT on my agenda.


  Im my previous career I took care of MRI Magnets, so I could help with the
supercond ucting magnet thing...t hink I still have my cryro license somewhere ..
 does seem like overkill for a clock though. Smiley

Art
 
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Thanks, have fun,
Art
kit
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« Reply #5 on: October 09, 2017, 05:19:37 AM »

 Grin
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