The four calendars make up "S-type" mechanism, which can adjust the pressure to the lap, ensuring a perfect lap winding
up on the two big calendars, having the best fiber arrangement and best fiber evenness.
These are: insulated short-circuited lap winding and insulated short-circuited wave winding.
b) When two half-sections, which located from each other approximately by one pole pitch, are connected together (n=2), we get a short-circuited lap winding (Fig.
The current surges, when the block enters or leaves the active region, are less than the corresponding for lap winding (curve 1).
The total power losses in the block wave winding is less than the one resulting from the use of lap winding, since the number of wave winding blocks located in the active region is 3 times less than the number of lap winding blocks.