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Avoiding wires be tangled on the dc motor's shaft

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javierpindter

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Hello, first of all thanks to everybody. I'm working on a POV display project. My problem is that I have no idea of how to avoid that the wires of the LED bar be entangled on the motor's shaft when the propeller starts moving. The control board is on a static position next to the motor. Thanks again for any suggestion.
 

I have seen two methods of accomplishing this. There may be others.

1. Use brushes and slip rings to convey the signals from the stationary part to the spinning motor. This is the same way an alternator gets power to the rotor. The shaft has a series of isolated rings. The rings then have conductors running to your board. brushes ride on these rings and conduct the needed power or signals.

2. The other method is to form a transformer between the spinning part and the stationary part. The transformer conducts across an ac voltage which is then rectified to produce power for the POV display.

Both methods require the control electronics to be placed on the spinning portion. This is to minimize the number of signals that must be tranferred across the stationary to spinning boundary.
 
banjo said:
I have seen two methods of accomplishing this. There may be others.

1. Use brushes and slip rings to convey the signals from the stationary part to the spinning motor. This is the same way an alternator gets power to the rotor. The shaft has a series of isolated rings. The rings then have conductors running to your board. brushes ride on these rings and conduct the needed power or signals.

2. The other method is to form a transformer between the spinning part and the stationary part. The transformer conducts across an ac voltage which is then rectified to produce power for the POV display.

Both methods require the control electronics to be placed on the spinning portion. This is to minimize the number of signals that must be tranferred across the stationary to spinning boundary.
Click to expand...

banjo THANK YOU VERY MUCH, your answer was very precise, helpful and express. Until your post I have no idea of the existence of the slip rings (sorry). I founded https://maybevideodoes.de/howto/slipring.html. Now I can continue with the project. Thanks again.
 

Another option that has been used, requires modification to the motor case/bearing at the shaft end. The original bearing is removed and discarded, the case enlarged to accept a larger bearing with a larger I/D, a sleeve is then used to route the wires between the bearing and the armature and the whole thing re-assembled.

The whole process can be found here:
http://www.metricmind.com/clock/clock.htm

HTH.
 

Mickster said:
Another option that has been used, requires modification to the motor case/bearing at the shaft end. The original bearing is removed and discarded, the case enlarged to accept a larger bearing with a larger I/D, a sleeve is then used to route the wires between the bearing and the armature and the whole thing re-assembled.

The whole process can be found here:
http://www.metricmind.com/clock/clock.htm

HTH.
Click to expand...

Hello Mickster, thanks for the url. At this time I'm trying with the http://maybevideodoes.de/howto/slipring.html, but I won't dismiss the option you suggest.
 

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