Permanent magnet rotor assembly for a wind turbine using a wedge attachment mechanism
View Patent ↗A wedge mechanism including at least one wedge element and a guide member. The guide member is attached to the second assembly and adapted for receiving the wedge element in a way that and at least an inactive position of the mechanism is defined where the first and second assemblies can be detached from each other, and an active position where at least one of the wedge element and the guide member presses against two different sectors of the first assembly such that the first assembly and the second assembly remain attached to each other.
1. A permanent magnet rotor assembly for a wind turbine, comprising:
a rotor defining a rotor rim;
a plurality of permanent magnet modules arranged longitudinally on the rotor rim adjacent to each other around a circumference of the rotor rim;
at least two wedge parts, each wedge part comprising a first portion defining an inclined plane inner surface and a second portion defining an opposite outer surface;
a longitudinally extending guide member mounted directly to the rotor rim between adjacent ones of the permanent magnet modules; and
the first portion of the wedge parts slidable into the guide member with the inclined plane inner surfaces facing such that axial displacement of the wedge parts along the guide member causes the outer surfaces of the second portion of the wedge parts to move perpendicular to a longitudinal axis of the rotor and engage against facing inner surfaces of the adjacent permanent magnet modules in an active position of the wedge parts to attach the permanent magnet modules to the rotor rim.
2. The permanent magnet rotor assembly of claim 1 , wherein the guide member does not engage against the facing inner surfaces of the adjacent permanent magnet modules in the active position of the wedge parts.
3. The permanent magnet rotor assembly of claim 1 , wherein the guide member comprises a substantially C-shaped cross section, wherein the second portion of the wedge parts extends out of and the C-shaped cross section.
4. The permanent magnet rotor assembly of claim 3 , wherein the wedge parts comprise a substantially L-shaped cross section, a smaller leg of the L-shaped cross section defining the first portion slidable into the C-shaped cross section of the guide member, and a longer leg of the L-shaped cross section defining the second portion of the wedge part.
5. A wind turbine generator, comprising the permanent magnet rotor assembly of claim 1 .
6. A wind turbine, comprising the wind turbine generator of claim 5 .