flyrotary@lancaironline.net Mailing List Archive

I don't know how likely an overvoltage condition is with the internal regulator in the denso alternator is, but if it did run away like that, you cook your computer and the big fan thingy attached to your motor stops moving and it gets real quiet.

I'm not sure, but I think that an overvoltage condtion is much more likely with a mechanical voltage regulator. Anyone out there know more about these things?

Brian Trubee

-----Original Message-----
From: shipchief@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, Sep 22, 2010 12:57 am
Subject: [FlyRotary] Re: Alternator

Like Brian, I 'm running a 60 amp NIPON DENSO. I'm running a mini 1 wire alternator I got on ebay. It failed (low voltage) because the brush holder was too tight on the brushes and held one too tight until it lost contact with the slip ring. I quickly and easily got a better replacement from "the rebuilder" in Kent WA. ($6) He said "you gotta love that DENSO, everything is mounted on the back."

And that's true. the regulator, diode bridge and brush rigging are all on the back and can be removed for service without removing the alternator from the engine if you have enough room. That servicability more than makes up for the one deficiency I had.
I just bought a second one because the output connection post faces straight off the back, which suits me. My current one has the output post touching my oil cooler inlet duct, so the new version suits my application better.

Gotta love the DENSO!!

I might consider an output overvoltage 'crowbar' protection device, but I have not yet heard of one of these alternators failing to 'overvoltage'.

Scott

-----Original Message-----
From: bktrub@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Sep 21, 2010 4:32 pm
Subject: [FlyRotary] Re: Alternator

I'm using a 40 amp Nippondenso alternator, with a slightly larger diameter pulley that is a micro v-belt(serpentine style). I got it new from Romaine Electric in Seattle for $140 new. It has an internal voltage regulator. It puts out plenty of juice.

Brian Trubee

-----Original Message-----
From: josrph berki <jskmberki@windstream.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Sep 21, 2010 3:21 pm
Subject: [FlyRotary] Alternator

What alternator is being used on the rotary?  With EFI and electronic
ignition I would think a 60 amp would be suitable.  Does anyone have a light
weight small solution?  Thanks for any help.

Joe Berki
Limo EZ


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