WEDGE-SHAPED STATOR LOCKING
Publication Date: 2016-Nov-24
The IP.com Prior Art Database
Jani Sundström: AUTHOR [+4]
Wedge-shaped stator locking for an electric machine such as a generator (a doubly-fed wind generator, for example) or a motor. In the improvement, there is provided a stator locking assembly in which the support of the stator against the torque directed thereto is realized by means of one or more generally wedge-shaped members. The wedge-shaped members may be wedged between the stator back beam and a support member fastened, e.g. by welding, to the machine body structure. Additionally, the one or more wedge-shaped members may be fastened to the machine body structure by suitable fastening means, such as bolts or screws, to prevent it from being pushed out of place as a result of the machine vibrations or vertical forces, for example.
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WEDGE-SHAPED STATOR LOCKING
The disclosure relates to the construction of an electric machine such as a generator (a doubly-fed wind generator, for example) or a motor.
In an electric machine comprising a stator there may exist a need to lock or clamp a stator of the electric machine in place such that the stator will not be able to rotate due to the torque directed thereto during the operation of the electric machine.
The stator may be locked to a machine body structure by a flange joint using one or more flanges which are fastened both to the stator and the machine body structure in a suitable manner such as by using bolts or screws. A problem related to such a flange joint using bolts is that it requires that the positioning of the stator in relation to the machine body structure is accurate in the axial direction. Due to a welding of the machine body structure such an accurate positioning may be challenging to accomplish, and an additional work step, shimming, may be required in order to make the friction joint of the bolts work. Also a large number of bolts may be required.
Another way to lock the stator to the machine body structure is to use a fork-like member, which is fastened to the machine body structure by bolts, for example, and which locks the stator back beam in place in a form-fitting way. A problem related to this solution is that the fastening of the fork-like member to the machine body structure may require a large number of bolts because of the friction joint and hence in case of a larger machine size also the size of the machine body structure needs to be increased in order to obtain the required space.
In the improvement, there is provided a stator locking assembly in which the support of the stator against the torque directed thereto is realized by means of one or more gener- ally wedge-shaped members. An example of such a wedge-shaped member is shown in the following figure.
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