Chamber for conductors of electric machines
View Patent ↗The present disclosure relates to a chamber for housing strands of a stator bar for electric machines. The problem to provide a reliable chamber for a stator bar of an electric machine is solved with a stator bar chamber engaging a stator bar in an electric machine. The chamber includes a number of hollow conductors in a first straight part of the chamber, a number of hollow conductors in a second tapered part, and a number of hollow conductors and adjacent solid conductors in a third straight part. The first part of the chamber is closed with a ring mounted at the edge of the first part and a nipple adapted to the ring.
1. A stator bar chamber engaging a stator bar in an electric machine, the chamber comprising:
an interior area defined by the chamber for housing conductors within the interior area;
a number of hollow conductors housed within a first straight part of the chamber, housed within a second tapered part of the chamber, and housed within a third straight part of the chamber;
a number of solid conductors housed within the third straight part of the chamber adjacent the number of hollow conductors;
a ring mounted with a portion of the ring within the first straight part of the chamber and a portion of the ring abutting an outer free end of the first straight part of the chamber;
a nipple comprising a connection portion with an outer cross-section of the connection portion connected within and to an inner cross-section of the ring;
a first brazing zone in a part or in a whole of the first straight part of the chamber with brazing electrically connecting the number of hollow conductors; and
a second brazing zone in a part or in a whole of the third straight part of the chamber with brazing creating a watertight third straight part of the chamber.
2. The stator bar chamber according to claim 1 , wherein the ring is made from copper and the nipple is made from stainless steel.
3. The stator bar chamber according to claim 1 , wherein the ring is brazed to the outer free end of the first straight part of the chamber.
4. A bi-metallic composition comprising a ring from one metal and a nipple from a different metal connected to a stator bar chamber according to claim 1 .
5. A manufacturing method for a stator bar chamber comprising:
providing an interior area defined by the chamber for housing conductors;
arranging a number of hollow conductors within a first straight part of the chamber;
arranging the number of hollow conductors within a second tapered part of the chamber;
arranging the number of hollow conductors and adjacent solid conductors within a third straight part of the chamber;
connecting to the first straight part of the chamber a ring with a first portion of the ring arranged within the first straight part of the chamber and a second portion of the ring abutting an outer free end of the first straight part of the chamber; and
connecting to the ring a nipple comprising a connection portion with an outer cross-section sized to connect within and to an inner cross-section of the ring.
6. The method according to claim 5 , further comprising:
brazing the ring to the nipple;
brazing the number of hollow conductors and adjacent solid conductors to the third straight part of the chamber; and
brazing the brazed nipple and ring to the first straight part of the chamber.