Interesting Motor -- Only the Brushes Rotate

[Matt Watts]

Skip out to about 3 hours, 54 minutes to see where they run this thing up.

https://www.youtube.com/watch?v=FwgwW7sZmzY

Uses slip rings to transfer power to the main brushes.  Only the main brushes rotate, not the armature.

Very screwy and I wouldn't think it would even run.  Maybe I'm not looking at it right, but it's sure interesting.

[BEP]

Skip out to about 3 hours, 54 minutes to see where they run this thing up.

https://www.youtube.com/watch?v=FwgwW7sZmzY

Uses slip rings to transfer power to the main brushes.  Only the main brushes rotate, not the armature.

Very screwy and I wouldn't think it would even run.  Maybe I'm not looking at it right, but it's sure interesting.

Interesting way to check for shaft power  Imagine doing that to a conventional motor that large 

Two points for brush resistance for each conductor, no energy stored in rotor momentum, relying only upon the Lorentz force for rotation?

Are they trying to turn the calendar back on motor design to the beginning?

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Something must rotate. If you lock the rotor and the stator then the commutator must see the rotational force. This is true for almost any brushed motor.

I've seen generators and motors after self-destruction where the bearings were the only thing that rotated and melted in the process.