Equalizing Links on DC Machine Windings

In the design and construction of Direct Current (DC) windings, depending on the number of slots, number of pole pairs, and on the type of winding we find same potential points. To correct for the execution imperfections between same potential points, equipotential connections are provided, depending on the type of winding. There are situations where same potential points are not physically accessible, being placed in slots or on different frontal parts. Connection equipotential points is done by means of connections placed in holes made in the magnetic rotor core, such that no electromotive voltages are induced. This makes the design of the magnetic rotor core more complex and can lead to asymmetries in the machine. The work presented in this paper proposes the use of equalizer links between different potential points. In these links, which are placed in suitable slots, electromotive voltages are induced. These voltages must compensate for the difference between the winding points they are applied to. The use of the equations presented here must result into an as small as possible drop in the relative voltage between the connected points, while the number of elementary coils should be an integer multiple of the equalizing links.