On Sun, 8 Feb 2009 20:55:40 -0800, "Calif Bill"
wrote:


"Wes" wrote in message
...
"Mach1" wrote:

Build a good cage around the alternator. At 10,000 rpm there could be
pieces going into earth orbit.


The ratio of the crank pulley to alternator pulley on cars is ~2:1.
Almost all IC auto
engines can hit 5000 rpm before rev limiting takes place.

Just out of curiosity, has anyone ever had an alternator blow up from rpm?

Wes

Did have a tile saw lose an armature piece. No blowup but the brushes
disappeared.

Common on commutator motors and generators - but alternators are not
built that way.