4 ms·
A reduction gear is really not all that much of a loss, wind on the other hand-- that's a big one.
by adammunich 7y ago
A reduction gear is really not all that much of a loss, wind on the other hand-- that's a big one.
- londons_explore 7y agoAirflow losses in big AC generators are solved by having the whole motor sealed in helium. The helium gas is used as a coolant too. It would be hard to design such a system with a big enough supply of gas to survive leakage for the whole life of the motor though.
- mikeash 7y agoAirflow losses for a car will be dominated by the outside air. Surrounding the car with helium seems impractical, and hard on the occupants.
- foobiekr 7y agoI thought these mostly used hydrogen instead of helium? (and as an aside, hydrogen detecting sensors is an area of astounding complexity and cool effects which are worthy of an HN post all on their own)