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Wireless power transfering for propeller clock

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freedomtruth

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I'm going to build one of these propeller clocks. **broken link removed**
the power is transferred to the rotating part using a transformer.
I need 5v 500ma after rectifying and regulating using a 7805.

the question is:
1- is 0.3 mm wire OK?
2- if 12v enough at the primary winding?
3- what should be the switching frequency and duty cycle for the primary winding?

thanks
 

1.Yes, 0.3 mm wire can pass 0.5A.
2. I do not see where 12 V comes after you use 5V regulator.
3. This you should find in the instruction.
 
jiripolivka said:
1.Yes, 0.3 mm wire can pass 0.5A.
2. I do not see where 12 V comes after you use 5V regulator.
3. This you should find in the instruction.
Click to expand...

Thanks for answering
2. the primary is gonig to be switched using 12V. (5v is to be attained in secondary)
3. the instructions are inadequate. besides, my dimensions and windings are going to be a little different.

I'm going to wind 100t primary > 150t secondary and THEN build the switching circuit.
 
Last edited:

freedomtruth said:
Thanks for answering
2. the primary is gonig to be switched using 12V. (5v is to be attained in secondary)
3. the instructions are inadequate. besides, my dimensions and windings are going to be a little different.

I'm going to wind 100t primary > 150t secondary and THEN build the switching circuit.
Click to expand...

If there are no detailed instructions on the switching frequency, I would reverse the problem:
Any DC fan like shown in the instructions runs by itself (usually a three-phase switching circuit with Hall sensor(s) and transistors). From this circuit you can extract the switching pulse train and use it to sync the LED string driver.

- - - Updated - - -

Or you can mount a LED/photodiode sensor on the propeller or LED string carrier to generate the trigger pulse that starts LED drivers. This means you can get the sync pulse without even touching motor circuit.
 

jiripolivka said:
use it to sync the LED string driver.
Click to expand...

I think you've misunderstood. My problem is not about synchronizing the LED string driver. It's about transferring power to the propeller through a transformer.
 

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