3 ms·
> such motors require frequent maintenance for changing the brushes. "Frequent" is all relative. The Renault Zoe, 10y ago, was already using a synchronous eng
by adev_ 4mo ago
> such motors require frequent maintenance for changing the brushes.
"Frequent" is all relative.
The Renault Zoe, 10y ago, was already using a synchronous engine with wired rotor. And most were going over 150kkm without any issues nor brush changes.
> because the electrical currents that circulate through the rotor windings must generate heat
Currently stator heat in wired synchronous engine is less a problem than in SynRMs with permanent magnets.
Most neodymium based permanent magnets start to be irreversibly damaged id they heat up beyond 100°C. That's currently why Tesla has such a good cooling system in their engine.
Wired rotor are bunch of copper coil, as such they are much more resistant to temperature gradients.
- wolfi1 4mo ago150kkm - wouldn't that be 150 Mm?
- halper 4mo agoYes, you are correct. As the SI brochure states: "Compound prefix symbols, i.e. prefix symbols formed by the juxtaposition of two or more prefix symbols, are not permitted." Unfortunately, almost no one uses SI units and/or prefixes correctly.
- taffydavid 4mo agoI have another alternative: you could simply prefix the km with ,000
- AngryData 4mo agoMeh, units should be used at the convenience of us, they are all arbitrarily defined to start with. We still use lots of non-si units, like AUs, minutes seconds and hours, degrees and arc units, or whatever else. Conversion is easier than ever today so I think units should be adapted to the application and use more fractional units when appropriate.
- ben_w 4mo agoSure, also 1 mAU and 0.5 light seconds, but treating km as a base unit and prefixing it with another k isn't too uncommon a misuse.
- bibelo 4mo agoit's also 150 000 000 meters