The “Diaphragm Fixation Technique” clamps in one operation all the elements of the rotor of an electrical machine and represents a novel and advantageous alternative to the usual gluing or shrink-fit for instance.
Looking at the example animation, all the elements of the rotor, here several permanent magnets as well as the shaft, are assembled in a very efficient way by a single press-fit of the shaft.
This is obtained by applying two Diaphragm technique principles: 1) the introduction of small off-sets of the apertures in the (all identical) plates and 2) the stacking of the plates in different orientations to obtain opposing off-sets.
The same can be done by pivoting the Diaphragm plates as shown in the second animation featuring the Diaphragm Fixation of squirrel cage bars in the rotor of an electric motor by means of dowel pins inserted in slightly off-set apertures.
Reasons to go to the Diaphragm Fixation of rotors:
(Please note that it is even possible to clamp surface permanent magnets by pressing on their rims)