4 ms·
> Also, the slip rings capable of passing high current to an electromagnet rotor are expensive and less robust than permanent magnets. The new designs are all
by pbmonster 2y ago
> Also, the slip rings capable of passing high current to an electromagnet rotor are expensive and less robust than permanent magnets.
The new designs are all inductively coupled, i.e. they have a rotating transformer coil built into the shaft. No brushes, no slip rings.
- Workaccount2 2y agoCoupling without using a core (or using an air core) is gonna hit efficiency pretty badly though.
- pbmonster 2y agoUnfortunately, I can only find material from the marketing department on that issue. But if I understand correctly, both coils have a ferrite core (and yoke), but there is a small air gap where the rotating side is separated from the stationary side.