V Twin Alternator

[rdean]

I had thought of using a stepper motor as an electrical source for some time but supposed it would be less than suitable.
I saw a video that I think Jim Dodson had made using a stepper motor and a bridge rectifier to light a DC bulb so I had some time and a small stepper motor so why not give it a try.
I mounted it on my V-Twin with a 1 to 1 gear ratio and hooked the stepper windings in series.





I was surprised to say the least.
At 1400 rpms the unloaded output was 120 volt A/C and with a 7 watt load it only dropped to 90 volts.
I believe the cycles per second are in the thousands so next week a friend of mine will bring over his scope so we can do some more tests.

And here is a short video.

Thanks for looking
Ray

 

[Chris Hamel]

Engine sounds good. Just ticking away.

 

[markba633csi]

Cool

 

[Weldingrod1]

Old Slo-syn motors also work very well for this!

Any brushless motor will also do it.

Sent from my SM-G715A using Tapatalk

 

[rdean]

I finally got some time to do some tests at different rpms.

1250 rpm
85 volts
943 cycles per second

1450 rpm
92 volts
1080 cycles per second

1700 rpms
103 volts
1240 cycles per second

1850 rpms
115 volts
1330 cycles per second

All readings are approximate but what they do show is the volts and cycles follow the rpms. I don't have any readings higher than 1850 rpms but I would expect the output would increase in proportion to the rpms.
If the stepper motor was geared up I wonder how high the numbers would get.

Food for thought

Ray