Symmetrical lamination stacking pattern for electric motor rotor - has longitudinal bolts supporting radially segmented plates and distributing radial forces through rotor volume

摘要

The lamination stacking pattern is for the rotors of large electromagnetic machines esp. synchronous machines. The laminations are segmented radially to provide a uniform distribution of mechanical loading due to centrifugal forces, and to ensure adequate ventilation and cooling of the rotor. The segmented laminations are symmetrical about the rotor shaft (2), each segment being separated by a slot from its neighbours. The stacks (R, S, T, U, V, W) of such segments are angularly displaced from each other along the length of the shaft and held in their position by bolts (9) passing from end to end in such a way that the mechanical loading is passed and distributed to stacks displaced from each other and hence over the whole rotor vol.