By Jacek F Gieras; Rong-Jie Wang; Maarten J Kamper
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Extra info for Axial flux permanent magnet brushless machines
The number of all coils is s1 /2 and the number of coils per phase is nc = s1 /(2m1 ) where s1 is the number of stator slots and m1 is the number of phases. In a double-layer winding two sides of different coils are accommodated in each slot. The number of all coils is s1 and the number of coils per phase is nc = s1 /m1 . 1) where 2p is the number of poles. 4) where N1 is the number of turns in series per phase, ap is the number of parallel current paths and aw is the number of parallel conductors.
This type of design offers higher efficiency at zero cogging torque. In order to maintain a reasonable level of flux density in the air gap, a much larger volume of PMs in comparison with laminated stator core AFPM machine is required. The stator winding is placed in the air gap magnetic field generated by the PMs mounted on two opposing rotor discs (Fig. 4d). When operating at relatively high frequency, significant eddy current losses in the stator winding conductors may occur . S N N S 4 3 S N 2 1 2 S N N S S N 3 4 Fig.
It has shorter end connections than the trapezoidal coils. The inclined arrangement of the coil’s active sides makes it possible to place water cooling ducts inside the stator. The main drawback of rhomboidal coils is the reduction of the torque. 4 Non-Overlap (Concentrated Coil) Windings The term non-overlap windings defined here refers to the windings of which the coils do not overlap. As with overlap windings non-overlap windings can be of single or double layer, concentrated or distributed, integral or fractional and air-cored or iron-cored.