An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1.

In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too hard to change the voltage regulator so that it targets 16V for example. 24V is probably also possible, but that's where I'm starting to guess, and this question arises.

To what extent can an alternator's parameters be varied, especially in terms of output voltage?

Background (for the curious)

I'm asking this in reference to my previous question. It is possible to use a large, water-cooled alternator for the generator part there. I am wondering whether an alternator supporting a 6:1 input speed ratio and 5:1 output voltage ratio would be feasible (specifically: 1500-8000 RPM, 24-120V, ~400A). I feel that it's not, but I don't have the exposure in this area and I wasn't able to google anything relevant - I don't know the right terms. If it's unfeasible, I'd like to learn about the technical difficulties that make it so, and what can I do to optimize the whole system (e.g. is it better to vary speed, or voltage?). Pointers to resources for people unaccustomed to electrical machines would be well appreciated, especially if focused towards alternators.

Keep in mind that the alternator would be custom-built for this task, but I would want to avoid being totally clueless about the work those guys would be doing, and I like to know what is considered reasonable to ask them for.

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1.

In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too hard to change the voltage regulator so that it targets 16V for example. 24V is probably also possible, but that's where I'm starting to guess, and this question arises.

To what extent can an alternator's parameters be varied, especially in terms of output voltage?

EDIT: I'm also concerned with practicality. As in, "it will work, but the alternator efficiency will be abysmal at the extremes of the RPM range" - then it's not really working.

Background (for the curious)

I'm asking this in reference to my previous question. It is possible to use a large, water-cooled alternator for the generator part there. I am wondering whether an alternator supporting a 6:1 input speed ratio and 5:1 output voltage ratio would be feasible (specifically: 1500-8000 RPM, 24-120V, ~400A). I feel that it's not, but I don't have the exposure in this area and I wasn't able to google anything relevant - I don't know the right terms. If it's unfeasible, I'd like to learn about the technical difficulties that make it so, and what can I do to optimize the whole system (e.g. is it better to vary speed, or voltage?). Pointers to resources for people unaccustomed to electrical machines would be well appreciated, especially if focused towards alternators.

Keep in mind that the alternator would be custom-built for this task, but I would want to avoid being totally clueless about the work those guys would be doing, and I like to know what is considered reasonable to ask them for.

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1.

In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too hard to change the voltage regulator so that it targets 16V for example. 24V is probably also possible, but that's where I'm starting to guess, and this question arises.

To what extent can an alternator's parameters be varied, especially in terms of output voltage?

Background

I'm asking this in reference to my previous question. It is possible to use a large, water-cooled alternator for the generator part there. I am wondering whether an alternator supporting a 6:1 input speed ratio and 5:1 output voltage ratio would be feasible (specifically: 1500-8000 RPM, 24-120V, ~400A). I feel that it's not, but I don't have the exposure in this area and I wasn't able to google anything relevant - I don't know the right terms. If it's unfeasible, I'd like to learn about the technical difficulties that make it so, and what can I do to optimize the whole system (e.g. is it better to vary speed, or voltage?). Pointers to resources for people unaccustomed to electrical machines would be well appreciated, especially if focused towards alternators.

Keep in mind that the alternator would be custom-built for this task, but I would want to avoid being totally clueless about the work those guys would be doing, and I like to know what is considered reasonable to ask them for.

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1.

In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too hard to change the voltage regulator so that it targets 16V for example. 24V is probably also possible, but that's where I'm starting to guess, and this question arises.

To what extent can an alternator's parameters be varied, especially in terms of output voltage?

Background (for the curious)

I'm asking this in reference to my previous question. It is possible to use a large, water-cooled alternator for the generator part there. I am wondering whether an alternator supporting a 6:1 input speed ratio and 5:1 output voltage ratio would be feasible (specifically: 1500-8000 RPM, 24-120V, ~400A). I feel that it's not, but I don't have the exposure in this area and I wasn't able to google anything relevant - I don't know the right terms. If it's unfeasible, I'd like to learn about the technical difficulties that make it so, and what can I do to optimize the whole system (e.g. is it better to vary speed, or voltage?). Pointers to resources for people unaccustomed to electrical machines would be well appreciated, especially if focused towards alternators.

Keep in mind that the alternator would be custom-built for this task, but I would want to avoid being totally clueless about the work those guys would be doing, and I like to know what is considered reasonable to ask them for.