Don Dunbar wrote:

Today we took delivery of a 3 cylinder diesel make by Kobota. Installed on this engine was the smallest alternator I have seen. It was 90mm in diameter and 80mm from the pulley face to the back clear of terminals. The output is 30 amps.
The fields look to rotate around the armature with pulley mounted to the outer casing and the shaft fixed to the holding bracket.
I dont know what RPM it runs at but will try to take some phots tomorrow and get more details.
This engine runs at 3600 rpm and at first glance the A section pulley was only 50mm OD and the drive pulley was around 100mm. This puts this alternater above 7000 RPM.
Regards Don

 
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