ARRANGEMENT FOR COOLING A STATOR OF AN ELECTRICAL MACHINE WHERE A METAL COOLING PIPE IN THE STATOR IS CONFIGURED SUCH THAT INDUCED VOLTAGE IN THE COOLING PIPE IS REDUCED OR MINIMISED

摘要

An arrangement for the cooling of an electrical machine is disclosed. The stator of the electrical machine contains a number of stacked laminate plates where each laminate plate has a number of slots on one side that form channels to carry a metal-winding of electrical coils of the stator. A metal cooling-pipe is located within at least one channel for cooling of the laminate plates. The cooling-pipe is a continuous metallic pipe with a number of hairpin bends, so that the cooling medium is guided through a first channel in a first direction and is guided back through a second channel in a second direction, where the first direction is contrary to the second direction. The cooling-pipe is located within first and second channels, where a third channel without cooling pipe is located between the first and second channels so that voltages which will be induced in the metal cooling-pipe while the electrical machine is at work, are reduced or minimised.