US 11,855,499 B2
Voltage balanced winding pattern for an electric machine with a minimal number of connections and method for assembly of such winding
Gorazd Lampic, Ljubljana (SI); Gorazd Gotovac, Ljubljana (SI); and Martin Strojnik, Domzale (SI)
Assigned to Elaphe Pogonske Tehnologije D.o.o., Ljubljana (SI)
Filed by Elaphe Pogonske Tehnoloije D.o.o., Ljubljana (SI)
Filed on Dec. 21, 2017, as Appl. No. 15/850,075.
Prior Publication US 2018/0183292 A1, Jun. 28, 2018
Int. Cl. H02K 3/28 (2006.01); H02K 1/16 (2006.01); H02K 3/12 (2006.01); H02K 15/02 (2006.01); H02K 15/085 (2006.01)
CPC H02K 3/28 (2013.01) [H02K 1/16 (2013.01); H02K 3/12 (2013.01); H02K 15/024 (2013.01); H02K 15/085 (2013.01); H02K 2213/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A voltage balanced winding for a stator of an electric machine with a high number of pole pairs, said stator having a plurality of slots arranged in a circumferential direction of the stator in predetermined intervals, said winding being a pseudo-helical winding having a non-interweaving topology adapted to allow inserted conductors one by one, and having a wave winding distributed over D circumferential sectors in a circumferential direction of the stator and a winding distributed over J radial layers in the radial direction of the stator, wherein D being an integer greater than 1, and J radial layers in a radial direction of the stator, J consisting of an integer greater than or equal to D, wherein said winding consisting essentially of
at least two phases having a plurality of conductor segments, one conductor segment for each layer in each sector, and each of said conductor segments consisting essentially of a plurality of straight conductor portions arranged in an axial direction of the stator and a plurality of end-windings connecting the straight conductor portions to a wave pattern having multiple end windings of the mode, each straight conductor portion being accommodated in one slot,
wherein the plurality of conductor segments is divided into connected branches of conductor segments in series, wherein each connected branch includes at least D conductor segments selected from D different sectors d and D different layers j such that (j+d) mod D equals a predefined number, and
wherein a series of at least a first conductor segment of layer j1 and sector d1 and a second conductor segment of layer j2 and sector d2 with j1+d1=j2+d2 are integrally formed as a prefabricated uninterrupted conductor segment, and
wherein said conductor segments inserted into the plurality of slots arranged in the circumferential direction of the stator in the intervals to accommodate the straight conductor portions, and
thereby define a pseudo-helical winding having a fully balanced plurality of parallel winding branches.