Patent ID: 8253295

Claim:
A two-layer, m-phase winding of electrical machine of alternating current with concentric coils comprising the following combination of properties: a) coils of each phase situated in different layers of the winding, can be connected in series or in parallel so that electric current flowing through these coils would create magnetic field either having the number of poles of 2p=2k or of 2p=4k, where k=1, 2, 3, . . . ; b) the total number of coils equals 2mk; c) the number of coils in one layer of the winding equals mk; d) the number of coils in one layer of the winding, belonging to each phase, equals k; e) the number of coils of the winding, belonging to each phase, equals 2k; f) the phase coils situated in one layer of the winding, are displaced with respect to each other on the angle equal to 360 m electrical degrees; g) the phase coils situated in different layers of the winding, are displaced with respect to each other on the angle equal to 180 electrical degrees; h) the phase zone of each coil equals 360 m electrical degrees; i) the phase zone includes one coil, consisting of i concentric coils connected in series and having equal number of turns; j) the number of slots in the winding equals Z=2mki, where i=2, 3, 4, . . . is the number of concentric coils in a phase coil; k) the pitch of concentric coils of the phase changes from the maximum, equal to y max =2i−1, down to the minimum, equal 1, under the law y l =y max −2(l−1), where l=1, 2, 3, . . . i; l) the endwindings of coils of different phases and different layers remain in a single layer.