[Electric Boats] DC Brush 'Timing'

 

Hi,
I was just wondering if there is any advantage to having the brushes in
a DC motor able to rotate slightly as a unit around the axis of the
commutator.
Seeing as it must take time, albeit small, to create a magnetic field,
then just like with spark timing on a gas engine, which advances as the
speed increases, maybe the torque, in particular, of a DC motor could be
changed by changing the timing of the contact with specific commutator
segments?

John

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