What is the lamination material of the pole body and the thickness of the pole body insulation?

In electrical motors and generators, the pole body, also referred to as the core of the poles, is typically laminated to minimize eddy current losses. These laminations are made of high-grade silicon steel, a material chosen for its high electrical resistivity and excellent magnetic properties that reduce hysteresis losses. The silicon steel laminations are coated with an insulating varnish or oxide layer to increase electrical resistance between them, further reducing eddy current losses.

The thickness of the lamination varies based on the design and application of the motor or generator but generally ranges from 0.35mm to 0.5mm for standard applications. For high-efficiency applications, thinner laminations are used.

The insulation thickness between the laminations is minimal, typically ranging from a few micrometers to about 20 micrometers, depending on the coating process and the material used for insulation. This thin insulation layer is critical to ensure that while the eddy currents are minimized, the core can still perform its magnetic function effectively.