1. dynamo, open coil A dynamo the windings of whose armatures may be grouped in coils, which are not connected in series, but which have independent terminals. These terminals are separate divisions of the commutator and so spaced that the collecting brushes touch each pair belonging to the same coil simultaneously. As the brushes come in contact with the sections forming the terminals they takecurrent from the coil in question. This coil is next succeeded by another one, and so on according to the number of coils employed.
Definitions of dynamo, open coil
