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I heard about a company developing a turbo alternator. I'm not sure if they brought it to market yet.
The idea of driving the entire accessory chain with a turbo has some merit. If you use gears, the only the shaft with the big gear has a lot of bearing load from the belt. A planetary gear set could be used to neutralize bearing load on the turbo shaft. That way the forces on the gear translate into pure torque instead of a lateral force against the bearing. Also, you could use the waste gate to keep the accessory chain spinning at a constant speed, or reduced if you wish.
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