Establishing a wind turbine generator with one or more permanent magnet (PM) rotors

Abstract

A method for establishing a wind turbine generator with one or more Permanent Magnet (PM) rotors. The method comprises the steps of: manufacturing a generator prepared for taking one or more PM rotors, manufacturing one or more rotors comprising a plurality of holding means prepared for retaining PM material, mounting substantially non-magnetized PM material prepared for magnetization in said holding means before or after said one or more rotors are mounted in said generator, connecting a magnetization system for magnetizing said PM material in the generator, and magnetizing said PM material with said magnetization system. The invention also relates to a wind turbine nacelle, a wind turbine comprising said wind turbine nacelle and use of a wind turbine.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of pending International patent application PCT / DK2008 / 000114 filed on Mar. 19, 2008 which designates the United States and claims priority from Danish patent application PA 2007 00455 filed on Mar. 23, 2007, the content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to a method for establishing a wind turbine generator with one or more Permanent Magnet (PM) rotors, a wind turbine nacelle and wind turbine.BACKGROUND OF THE INVENTION[0003]Assembling a large scale wind turbine generator comprises the installation of a rotor in stator.[0004]For a PM wind turbine generator of large scale, excessive magnetic forces will interact between magnets of the rotor and iron of the stator resulting in a complicated installation setup.[0005]Disclosed in Danish patent DK 172430 is a method for assembling an electrical PM machine comprising a plurality of poles by fi...

AI Technical Summary

Benefits of technology

[0018]Further it is ensured that i.e. a correct positioning of the PM material on the rotor can be obtained resulting in e.g. a uniform air gap between the rotor and the stator of the generator. This in turn results in an improved performance such as a better balance of the rotor, a more uniform induction of the stator coils during operation etc.

[0022]In another aspect of the invention the magnetization current to said magnetization coil means is supplied by at least one power converter or section of said power converter as power supply. By a power converter is here meant an existing power converter of the wind turbine used to supply the utility grid during normal operation. Hereby it is ensured that existing power converters of the wind turbine can be used as power supply in said magnetization system which in turn reduces the requirements and costs to special dedicated magnetization tools. For different embodiments said supply of magnetization current to said magnetization coil can be supplied before or after the wind turbine nacelle is installed on a wind turbine tower.

[0023]In another aspect of the invention said magnetization current to said magnetization coil means is supplied by one or more power converters dedicated to said magnetization of PM material. Hereby it is ensured that said dedicated power converters can supply correct and sufficient parameters of the magnetization process such as current, voltage, magnetic field, time control etc. Furthermore it is ensured for different embodiments that said dedicated power converter can be made mobile and can be used to magnetization on different wind turbines. Hereby a reduction of investment in specialized magnetization equipment can be reduced.

Problems solved by technology

For a PM wind turbine generator of large scale, excessive magnetic forces will interact between magnets of the rotor and iron of the stator resulting in a complicated installation setup.

A disadvantage by the described method is that at the installation extensive magnetic forces act between the magnets and other magnetic components of the electrical machine.