I came by a massive CAV dynamo last evening. Over a foot long & about 8" across, it is a two handed grunt to lift it & it came complete with its regulator. It lacks a pulley, but the input shaft is an inch thick. The massive double brushes are disposed at 90o to each other & there are only two sets.
It is 12 Volts & is "low speed" according to the plate. The regulator speaks of "batteries" and 25 amps.
It sits in two neat cast iron cradle brackets and is strapped to them by two flat hold down steel straps. Although rather automotive in appearance, I'd say it was not used in that context - aside from anything else like mountings, it lacks any oilyness! I wonder what its original application was?
How do I figure out what "Low speed" is? If I motor it & check the speed with a tachometer, will that be accurate enough?
It is an ideal bit of kit for an engine to drive, but can its output be only25 amps considering its bulk?