I want to know the answer to the following question:
What made Pacinotti's motor an important advancement?
All the background I'm provided with is that "A major turning point in the development of DC machines took place in 1864, when Antonio Pacinotti described for the first time the ring armature with its symmetrically grouped coils closed upon themselves and connected to the bars of a commutator, the brushes of which delivered practically non-fluctuating current.". Is that enough to answer the question?
Answer: yes