Electromagnetic machine or device with specially machined active surfaces provided with spaced grooves for reducing electrical losses

摘要

The electromagnetic machine or device has specially machined active surfaces for prevention of surface losses and reduction of hysteresis losses. The active surfaces can be provided with machined grooves having a depth of between 1 and 2 mm, a width of 0.03 mm, at a relative spacing of between 0.5 and 1 mm.