Slip ring/alternator questions

I'm sure someone here can help. I need to get power to a solenoid
operated valve spinning at 5000 RPM. Low power, 24 volts at 5 watts.
The power will be on for about 4 seconds and off for 7 seconds. This
on/off cycle will be going on 10 hours a day. I have looked at slip
rings online but the high speed through hole type are really spendy.
Then I got to thinking about the slip rings in alternator. They
certainly can carry enough current but I don't know how fast
alternators typically spin. I do have an old alternator that would
make a good slip ring donor. Anybody know or have a better idea? I
need about 1 inch diameter through the slip rings.
Thanks,
Eric

 

[Rheilly Phoull]

On 12/04/2017 8:17 AM, etpm@whidbey.com wrote:

I'm sure someone here can help. I need to get power to a solenoid
operated valve spinning at 5000 RPM. Low power, 24 volts at 5 watts.
The power will be on for about 4 seconds and off for 7 seconds. This
on/off cycle will be going on 10 hours a day. I have looked at slip
rings online but the high speed through hole type are really spendy.
Then I got to thinking about the slip rings in alternator. They
certainly can carry enough current but I don't know how fast
alternators typically spin. I do have an old alternator that would
make a good slip ring donor. Anybody know or have a better idea? I
need about 1 inch diameter through the slip rings.
Thanks,
Eric

Not sure which "alternator" you have but a U/S vehicle one would yield
what you want most likely, probably you could mod the brush holders too.

 

[Benderthe.evilrobot]

<etpm@whidbey.com> wrote in message
news:fdsqec5rf15rsplc1nnb6hjndj3gu4bju2@4ax.com...

I'm sure someone here can help. I need to get power to a solenoid
operated valve spinning at 5000 RPM. Low power, 24 volts at 5 watts.
The power will be on for about 4 seconds and off for 7 seconds. This
on/off cycle will be going on 10 hours a day. I have looked at slip
rings online but the high speed through hole type are really spendy.
Then I got to thinking about the slip rings in alternator. They
certainly can carry enough current but I don't know how fast
alternators typically spin. I do have an old alternator that would
make a good slip ring donor. Anybody know or have a better idea? I
need about 1 inch diameter through the slip rings.
Thanks,
Eric

Most motorcycle alternators deliver peak output at 5000RPM - they're
probably not all that different to car ones.

AFAIK: most car alternators moved on to coaxial pole coupling for the rotary
field winding - which eliminates the need for slip rings.


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