CLAIMS(9) 1. A 4-layer sequential segment connection stator winding for a stator of a rotary electric machine, said stator winding formed of a plurality of phase windings each comprising an even number of identical-phase partial coils each of which is a 1-turn coil formed of a plurality of U-shaped large segments and a plurality of U-shaped small segments, each said large segment having two legs that are disposed as first and fourth conductor layers respectively within a predetermined pair of slots of said stator that are circumferentially separated by one pole pitch of said rotary electric machine, with leg ends corresponding to said first and fourth conductor layers protruding from said slots, and each said small segment having two legs that are disposed as second and third conductor layers respectively within a predetermined pair of slots of said stator that are circumferentially separated by said one pole pitch, with leg ends corresponding to said second and third conductor layers protruding from said stator slots; wherein: each mutually adjacent pair of leg ends corresponding to said first and second conductor layers are connected to be at an identical potential and are bent in an identical direction for being joined to leg ends of other segments; and a pair of said partial coils comprise a first partial coil formed as a 1-turn wave-wound coil comprising, within each of respective predetermined ones of said stator slots, a mutually adjacent pair of said first, second, third and fourth conductor layers, and a second partial coil formed as a 1-turn coil comprising, within said each predetermined stator slot, a remaining mutually adjacent pair of said conductor layers. 2. A 4-layer sequential segment connection stator winding according to claim 1, wherein in each said first partial coil and said second partial coil, said leg ends corresponding to said first and second conductor layers within a first stator slot are connected to leg ends of a pair of segment legs corresponding to said third and fourth conductor layers within a second stator slot, said second stator slot being circumferentially displaced from said first stator slot by a distance substantially equal to said pole pitch. 3. A 4-layer sequential segment connection stator winding according to claim 1, wherein a starting end of said first partial coil extends from a first pair of respective leg ends of a first large segment and first small segment, and a starting end of said second partial coil extends from a pair of respective leg ends of a second large segment and second small segment, and wherein said first pair of leg ends correspond to a first pair of mutually adjacent conductor layers within one of said stator slots and second pair of segment legs correspond to a second pair of mutually adjacent conductor layers within said one of the stator slots. 4. A 4-layer sequential segment connection stator winding according to claim 1, wherein said phase winding comprises an even number of interconnected ones of said partial coils, said partial coils being accommodated in respectively different stator slots within each of respective sets of circumferentially adjacent identical-phase stator slots. 5. A 4-layer sequential segment connection stator winding according to claim 4, wherein: each said set circumferentially adjacent identical-phase stator slots comprises m stator slots, where m is a natural number that is 1 or greater, each stator slot in said each set contains 4 n of said conductor layers, where m is a natural number that is 2 or greater, a total of 2 nm of said partial coils are formed of said 4 n conductor layers in said sets of m stator slots, and said phase winding is formed by interconnecting said 2 nm partial coils. 6. A 4-layer sequential segment connection stator winding according to claim 1, comprising at least one crossover segment, coupled between respective pairs of said segment legs for connecting at least two of said partial coils in series or in parallel. 7. A 4-layer sequential segment connection stator winding according to claim 1, comprising: insulation paper disposed, at each of said stator slots, to separate respective head portions of a large segment and small segment having legs thereof disposed as said first and second conductor layers of said slot from respective head portions of a large segment and small segment having legs thereof disposed as said third and fourth conductor layers of said slot; wherein said insulation paper is omitted from being disposed to mutually separate said head portions of said segments having legs thereof disposed as said first and second conductor layers of said slot, and said insulation paper is omitted from being disposed to mutually separate said head portions of said segments having legs thereof disposed as said third and fourth conductor layers of said slot. 8. A 4-layer sequential segment connection stator winding according to claim 1, comprising: insulating paper disposed, at each of said stator slots, to separate a pair of leg ends corresponding to said first and second conductor layers of said stator slot from a pair of leg ends corresponding to said third and fourth conductor layers of said stator slot; wherein said insulation paper is not disposed to mutually separate said leg ends corresponding to said first and second conductor layers of said stator slot and, said insulation paper is not disposed to mutually separate said leg ends corresponding to said third and fourth conductor layers of said stator slot. 9. A method of manufacturing a 4-layer sequential segment connection stator winding according to claim 1, comprising: inserting respective legs of each of said large segments, with said in a straight condition, into a predetermined pair of said stator slots at respective positions of said first and fourth conductor layers within said stator slots; inserting respective legs of each of said small segments, with said legs in a straight condition, into a predetermined pair of said stator slots at respective positions of said first and fourth conductor layers within said stator slots; at each of said stator slots, bending each of respective leg ends corresponding to said first and second conductor layers in a first circumferential direction, to displace respective tip portions of said leg ends by an amount substantially equal to one half of said pole pitch; bending each of respective leg ends corresponding to said third and fourth conductor layers in an opposite direction to said first circumferential direction, to displace respective tip portions of said leg ends by an amount substantially equal to said half pole pitch; and connecting each set of tip portions corresponding to said first and second conductor layers of a stator slot to an adjacent pair of tip portions corresponding to said third and fourth conductor layers of a stator slot. 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Posted on: Mon, 16 Sep 2013 10:17:51 +0000
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