They are called tachometer generators. Typically 50Volts/1000 RPM. But you can get higher voltages than that. This site says up to 200Volts at 1000 RPM. To get 500Volts, you run it at 2500 RPM. The voltage is directly proportional to the speed. If these are too small, you could also buy a 500VDC motor and energize the field, running it as a generator. You can usually get them with 150 / 300 Volt fields. They also make them in permanent magnet fields, but only rated at 180Volts @1750 RPM. You would have to run at 5000RPM, which might not hold up. Rectified 120V Ac is about 150 volts.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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