for more info:
http://www.manufacturing.net/magazine/dn/archives/1998/current/03d1733.htm
Because the field coil is fixed around the rotor shaft, the Bosch liquid-cooled
alternator needs no slip rings or brushes. The pole wheel rotates between the
static field coil and the stator winding in the alternator housing.
The magnetic field thus traverses two air gaps instead of one in a traditional
design. By eliminating rotating electrical parts, Bosch predicts service
intervals can be extended to 200,000 km for the new alternator.
Other auto hi tech stuff:
http://www.manufacturing.net/magazine/dn/channels/auto/
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