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Originally Posted by freebeard
If a rear-mounted turbo was grafted to a driveshaft with a 2nd one grafted to the other end, the altermotor could go anywhere in between.
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It doesn't sound like a bad idea at all, making a twin-stage centrifugal compressor with the alternator placed between the compression stages. Possibly it would not increase too much inertia like the setup driven by a PTO would.
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I don't know enough about turbo bearing to know if you could turn one into a PTO [power take off].
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Since some earlier jet engines relied on centrifugal compressors which are more similar to the compressor of a turbocharger than the axial ones fitted to modern airliners, and they still have an accessory drive, it doesn't seem impossible to design a turbocharger with a PTO.