for what ever its worth.... I run 3 harris pelton turbines here that are rewound ford alt's for 48v. I have removed the internal bridges and installed external ones...much better air flow for cooling. I have replaces the standard brushes with the heavy duty round ones and now I only change them once a year. Cant quite get two years out of them, so I just change them at the start of every season. the comms have to be changed everyother year.
doug ----- Original Message ----- From: "Max Klohn" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, October 18, 2005 4:53 AM Subject: Re: [microhydro] auto alternator brush life--response to Oso'scomment > Because you do not run your car 24 hours a day, 7 days a week, for > months and years. > Local experience with battery charger peltons is that brushes wear in > about 3 - 4 months with the internal charge regulator (which cuts off > induction current at full battery charge and causes the turbine to spin > at nearly VJet) and 8 - 10 months with resistive field currrent control > and constant turbine speed. > > Max > > Le lundi 17 octobre 2005 à 15:54 -0700, davis ron a écrit : >> That is the same thing I was thinking after >> reading Oso's comment. I have only had alternator >> failure a couple of times over 30 plus years of >> driving. Wny would they wear out so much faster when >> used with microhydro? >> >> --- Radu Babau <[EMAIL PROTECTED]> wrote: >> >> > Hello Oso, >> > >> > >> > You are saying that: >> > >> > > Most alternators are rated at 6000 rpm, so it >> > should produce the full >> > > 70 amps. You do need to subtract the excitation >> > current from that, so >> > > I would not count on anything above 65 amps. >> > > >> > > Spinning it at that speed, the brushes are not >> > going to last very >> > > long, 6-8 weeks would be my guess. If you cut the >> > speed to about 3000 >> > > rpm, the alternator should still produce 50-55 >> > amps and the brushes >> > > will last a little longer, say 12-16 weeks. >> > >> > I am wondering about this 12-16 weeks brushes life >> > time. Some of us have >> > cars which we mostly ride in the city, 90% of their >> > life time, on which the >> > normal motor speed is something from 1000-3000 >> > rpm's. Usually there is >> > something like 1.5 ratio between the alternator and >> > motor shaft. Other >> > people are mostly using their cars to run on >> > highways, which means 2000-5000 >> > rpm motor speed. In both cases the life time of a >> > alternator (including >> > brushes) is at least 5 years, even more. It is that >> > kind of equipment that >> > you only change once during a normal car lifetime. >> > >> > Am I wrong ? Am I right ? >> > >> > >> > Radu >> > >> > >> > >> > >> >> >> >> >> >> __________________________________ >> Yahoo! Mail - PC Magazine Editors' Choice 2005 >> http://mail.yahoo.com >> >> >> >> >> >> Does your company feature in the microhydro business directory at >> http://microhydropower.net/directory ? If not, please register free of >> charge and be exposed to the microhydro community world wide! >> >> NOTE: The advertisements in this email are added by Yahoogroups who >> provides us with free email group services. The microhydro-group does not >> endorse products or support the advertisements in any way. >> >> More information on micro hydropower at http://microhydropower.net >> >> To unsubscribe: send empty message to >> [EMAIL PROTECTED] >> Yahoo! Groups Links >> >> >> >> >> >> >> >> >> >> > > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. The microhydro-group does not > endorse products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
