Contains more than 4 magnetic pole or pole. The structure is made with thin steel plate.(Laminated steel sheet) is a bone anchored with bolts to reduce the heat from the eddy currents.
Contain more than 4-pole magnetic structure is made up of a thin steel plate (Laminated sheet steel) Extruded rods fastened with bolts to reduce heat from eddy currents.
Pole pole consists of more 4 above. The structure of thin plate. (Laminated sheet steel) compression bar is fastened by bolts to reduce the heat from the eddy current