Patent ID: 6121708
Filing Date: 2000-09-19
Classification: H02K

Abstract:
A slot sealing arrangement for use in sealing slots in a laminated stator core of an electrical machine, each slot comprising one winding slot and one preliminary slot, the winding slot being filled with winding bars or coils and the preliminary slot being free of winding bars and facing an air gap, the preliminary slot being immediately adjacent to the winding slot, wherein the slot sealing arrangement comprises:a discrete wedge arrangement capable of sealing the preliminary slot from the air gap and fixing the winding bars in the winding slot;wherein said discrete wedge arrangement defines at least one channel-like space used as a flow channel for a gaseous cooling medium, the at least one channel-like space being formed between the discrete wedge arrangement and an upper bar which is inserted in the winding slot; andwherein said discrete wedge arrangement includes an upper wedge and a lower wedge, said lower wedge having a first cross-sectional width adjacent the winding slot, a second cross-sectional width adjacent said upper wedge, and a middle cross-sectional width defined therebetween, said middle cross-sectional width being less than said first and second cross-sectional widths so as to increase in size said at least one channel-like space and thereby obtain optimum cooling effectiveness from the gaseous cooling medium in the flow channel.