Posted by Bob M on December 21, 2011 at 07:01:56 from (67.240.168.45):
In Reply to: AC from alternator posted by Mikes806/H on December 20, 2011 at 17:12:53:
Quoting Removed, click Modern View to see
Bob - I agree - don't try it!
A few comments:
Most (all?) automotive alternators are 14 pole. Running at 3,600 RPM the AC output frequency will be 420 hz. The effect of this high frequency on a motor designed for 60 hz is uncertain - but it definitely WILL NOT be good(!)
Automotive alternators generate 3 phase AC internally. But since your load is single phase AC, somewhat less than 50% of the alternator's rated power output (watts) can be utilized.
Finally voltage regulation will be a problem. In 12 volt DC service an alternator depends heavily on the battery to provide "ballast" that helps regulate output voltage. A custom VR would need to be designed to modulate 12 VDC to the rotor field winding and control the AC output.
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