M, PM and MD lamination cores are single-part lamination types. They have a closed jacket which is open at the appropriate point owing to a separation cut and thus allows the installation of the coil body. As with EI sheets, the coil body is mounted on the central arm. Jacket core sheets are divided into M, PM and MD types according to the different position of the separation cut and the different dimensional ratio between the steel jacket, winding space and central arm. Jacket core sheets achieve better magnetic properties and values than EI sheets with the corresponding dimensions. By using DIN standardised M range coil bodies, the PM sheets achieve higher performances than the corresponding M types and show lower scattering than them.
Stator and rotor technology
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