Gramme machine
A Gramme machine, Gramme ring, Gramme magneto, or Gramme dynamo is an electrical generator that makes direct current. It is named for its Belgian inventor, Zénobe Gramme. It was the first generator to make enough power for industry. Gramme showed this machine to the Academy of Sciences in Paris in 1871.
Gramme Machine Media
One-pole, one-coil Gramme ring.
One-pole, two-coil Gramme ring.
Two-pole, four-coil Gramme ring.
Three-pole, six-coil Gramme ring.
Diagram of magnetic lines through a Gramme ring, showing the very few magnetic lines of force crossing the center gap.
Early form of the Gramme ring armature with coils penetrating the interior of the ring.
Example of a single winding around the exterior of a drum core with no wires penetrating the interior.
Modern design of the Gramme ring, wrapped only around the exterior of the core.
