In D.C Generators the pole shoes are fastened to the pole core by
In D.C Generators the pole shoes are fastened to the pole core by Counter sunk screw.
Counter-sunk screws are often used to fasten the pole shoes to the pole core because they can be recessed below the surface of the pole shoe, creating a flush surface that helps to reduce air gap losses and improve the overall efficiency of the generator.
The main function of the pole shoes in a DC generator is to concentrate the magnetic field produced by the field coils onto the armature core, where it induces the generation of electrical power.
The pole shoes are typically made of a magnetic material such as iron or steel, and their shape and placement on the pole core are carefully designed to optimize the performance of the generator.