Generator with single turn wave winding, wind turbine and method for determining the thickness of the slot insulation of a generator

Abstract

The present utility model relates to a generator with single turn wave winding, a wind turbine and a method for determining the thickness of the slot insulation of a generator .A generator (76) comprising at least one pole set representing one phase (1, 2, 3) is disclosed. Each pole set comprises a number of poles (4), a number of slots (19) and a number of stator teeth. Each phase is insulated from neighbouring teeth by means of a slot insulation. A number of conductors (8) are assembled such that each conductor (8) is turned about the poles (4) of a particular pole set such that only half a single turn (8a, 8b, 8c, 8d) is associated to each pole (4a, 4b, 4c, 4d). Each pole (4) comprises a slot insulation (61, 62, 63, 64) between the pole (4) and the associated conductors (8). The slot insulation (61, 62, 63, 64) has a different thickness for at least two different poles (4) of the same pole set.

Description

technical field [0001] The invention relates to generators and wind turbines. It also relates to a method for determining the thickness of the slot insulation of a generator. Background technique [0002] Based on the technology in today's direct drive generators, each coil consists of more than one series turn, and it is also possible to connect a selected number of coils in series. Two of the above optional numbers (i.e. the number of turns in series and the number of coils connected in series) can be chosen to obtain the terminal voltage of the generator which itself can be already chosen based on power electronics / grid requirements . In the conventional type of winding described, the series turns in each slot need to be electrically insulated from each other due to the voltage difference between the series turns. [0003] The above type of insulation used in the slots of electric machines with conventional windings leads to different disadvantages: The poor heat trans...

AI Technical Summary

Problems solved by technology

[0003] The above type of insulation used in the slots of motors with conventional windings leads to different disadvantages: The poor heat transfer coefficient of the insulation makes it very difficult for the main source of heat in the generator (ie the windings) to be cooled down by the adjacent laminations

This in turn reduces the output torque for the same current density or reduces the efficiency for the same torque

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