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I would like to know how much lighter (if at all) a matched combination of an electrical motor and generator with a given power output would be today, compared to a similarly powerful combination manufactured in the 1960s or 70s. In each case, the technological capabilities of the time should be exhausted. Money is a secondary concern.

While general trends would be the most helpful, if details are needed, they could be like this:

  • Since the generator would be purpose built for just this one motor, the type and voltage of the current between the two can be chosen freely
  • The rotational speed is different, maybe 40 000 RPM for the generator and 10 000 RPM for the motor
  • The mechanical power from the motor should be about 15 kW
  • While efficiency shouldn't be absolutely neglected, low weight is more important. I don't know what kind of efficiency I could reasonably expect.
  • For the sake of simplicity, let's say no superconduction
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    \$\begingroup\$ Excellent, I look forward to your report. (I hope your spelling improves.) \$\endgroup\$ – George Herold Nov 10 '14 at 21:05
  • \$\begingroup\$ I forgot that firefox doesn't spell check the heading. Thank you for the comment. \$\endgroup\$ – Rikki-Tikki-Tavi Nov 10 '14 at 21:22
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    \$\begingroup\$ This paper gives some insight. I don't know if you can access it, as it is behind a paywall. \$\endgroup\$ – WalyKu Jan 28 '15 at 13:39

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