Wiring method of four-180-groove fourteen-pair-pole symmetrical eight-branch three-phase winding

Abstract

The invention provides a four-180-groove fourteen-pair-pole symmetrical eight-branch three-phase winding wiring method, and relates to the technical field of alternating current windings. According to the method, eight symmetrical branches are adopted for the high-capacity hydro-generator with fourteen pairs of poles, the matching scheme of voltage and branch current is expanded for the high-capacity hydro-generator, especially for the high-capacity hydro-generator operating in a high-altitude area, the design requirement of a ventilation system in the high-altitude area can be met, and the design requirement of the ventilation system in the high-altitude area can be met. And the design requirement of an insulation system in a high-altitude region can be met, and corona generated by a stator winding due to an overhigh voltage grade is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of AC windings, and in particular to a connection method for a symmetrical eight-branch three-phase winding with four hundred and eighty slots and fourteen pairs of poles. Background Art

[0002] According to the traditional motor winding symmetry theory, the number of motor poles must be a multiple of the number of stator winding branches. This symmetry theory means that the motor can only be selected within a limited branch range during electromagnetic selection. In particular, for pole numbers with a small number of decomposition factors, this will cause great difficulties in motor electromagnetic selection and may even make it impossible to provide a scientific and reasonable electromagnetic selection plan.

[0003] For hydro-turbine generators with fourteen pairs of poles, according to traditional motor winding symmetry theory, the number of stator winding branches must be a factor of the number of poles, and eight branches is not possible. However, in actual projects, there are situations where the design based on the traditional number of branches cannot meet the project requirements. For example, for 800MW hydro-turbine generators, especially for units in high-altitude areas, if the traditional number of branches is selected, the terminal voltage must be high. Otherwise, the stator slot current will be too high, exceeding the application limit of current air-cooling technology. However, the high voltage level poses a huge challenge to the design of the stator insulation system and anti-corona structure. In this case, if the number of branches is eight, not only can the voltage level be reduced, but the stator slot current can also be controlled within a reasonable range. This has significant advantages for ventilation system design and insulation system design, thus providing a reasonable and reliable technical solution for large-capacity hydro-turbine generators operating in high-altitude areas. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a connection method for a three-phase winding with four hundred and eighty slots, fourteen pairs of poles and eight branches. The synthesized potential amplitude of each branch among the eight branches is equal and the phase is the same, and there is no circulating current between the branches.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] A method for connecting a symmetrical eight-branch three-phase winding with four hundred and eighty slots and fourteen pairs of poles, comprising the following steps:

[0007] Step 1: Determine the stator winding cycle sequence according to the number of slots per pole and per phase;

[0008] Step 2: Number all stator slots from 1 to 480, specify slot 1 as the starting electrical angle, calculate the electrical angles corresponding to the other slots, and draw a slot star vector diagram based on the electrical angle of each slot;

[0009] Step 3. Divide the slot star vector diagram described in step 2 into six phase belts, U, W0, V, U0, W, and V0, according to the cyclic number sequence described in step 1. Each phase belt covers an interval of 60 electrical degrees; the U, V, and W phase belts differ from each other by 120 electrical degrees, the U0, V0, and W0 phase belts differ from each other by 120 electrical degrees, the U phase belt differs from the U0 phase belt by 180 electrical degrees, the V phase belt differs from the V0 phase belt by 180 electrical degrees, and the W phase belt differs from the W0 phase belt by 180 electrical degrees; combine the U phase belt and the U0 phase belt to form a U-phase winding, combine the V phase belt and the V0 phase belt to form a V-phase winding, and combine the W phase belt and the W0 phase belt to form a W-phase winding;

[0010] Step 4: Group the stator slots of each phase band into groups of 34 slots every other 34 slots according to the rule of synthetic pitch of 34. Each phase band contains four slot groups, and each slot group contains 20 slots.

[0011] Combine the four slot groups of the U-phase belt with the four slot groups of the U0-phase belt to form four slot group sets. In each slot group set, connect the two layers of wire rods in the 20 slots of the U-phase belt with the two layers of wire rods in the 20 slots of the U0-phase belt to form two branches. The four slot groups constitute eight branches of the U-phase winding.

[0012] Combine the four slot groups of the V-phase belt with the four slot groups of the V0-phase belt to form four slot group sets. In each slot group set, connect the two layers of wire rods in the 20 slots of the V-phase belt with the two layers of wire rods in the 20 slots of the V0-phase belt to form two branches. The four slot groups constitute eight branches of the V-phase winding.

[0013] The four slot groups of the W phase belt are respectively combined with the four slot groups of the W0 phase belt to form four slot combination sets. The two layers of wire rods in the 20 slots of the W phase belt in each slot combination set are connected with the two layers of wire rods in the 20 slots of the W0 phase belt to form two branches. The four slot groups constitute eight branches of the W phase winding.

[0014] Furthermore, the method of dividing the slot star vector diagram into six phase bands according to the cyclic number sequence in step three is: according to the number of stator slots represented by each number in the cyclic number sequence, the slot numbers of the included stator slots are sequentially allocated to the six phase bands.

[0015] Furthermore, in step 4:

[0016] In each slot combination, the upper wire rods in the 20 slots of the U phase belt are connected to the lower wire rods in the 20 slots of the U0 phase belt to form a branch, and the lower wire rods in the 20 slots of the U phase belt are connected to the upper wire rods in the 20 slots of the U0 phase belt to form a branch;

[0017] In each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch;

[0018] In each slot combination, the upper wire rods in the 20 slots of the W phase belt are connected to the lower wire rods in the 20 slots of the W0 phase belt to form a branch, and the lower wire rods in the 20 slots of the W phase belt are connected to the upper wire rods in the 20 slots of the W0 phase belt to form a branch.

[0019] Furthermore, in step 4, there is a long jumper wire in each branch of each phase, and the long jumper wire is a different-layer jumper, with one end connected to the upper layer wire rod and the other end connected to the lower layer wire rod.

[0020] Furthermore, in step 4:

[0021] To shorten the length of the jumper wire, each slot group in each phase belt is split into two sub-slot groups. Each sub-slot group has 10 slots, and each phase belt has eight sub-slot groups in total. The eight sub-slot groups are recombined into four slot groups in pairs, with the slot numbers differing by 20. The slot groups of the corresponding phase belts are then recombined accordingly.

[0022] In each slot combination, the upper wire rods in the 20 slots of the U phase belt are connected to the upper wire rods in the 20 slots of the U0 phase belt to form a branch, and the lower wire rods in the 20 slots of the U phase belt are connected to the lower wire rods in the 20 slots of the U0 phase belt to form a branch;

[0023] In each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch.

[0024] In each slot combination, the upper wire rods in the 20 slots of the W phase belt are connected to the upper wire rods in the 20 slots of the W0 phase belt to form a branch, and the lower wire rods in the 20 slots of the W phase belt are connected to the lower wire rods in the 20 slots of the W0 phase belt to form a branch.

[0025] Furthermore, in step four, the two sub-slot groups are connected through short jumper wires when combined; there are two short jumper wires in each branch of each phase, and the short jumper wires are same-layer jumpers with both ends connected to the same-layer wire rods.

[0026] Furthermore, in step 4:

[0027] The four slot groups of the U phase belt are combined with the four slot groups of the U0 phase belt in a pattern of 17 first pitches and 17 second pitches. In each slot combination, the 20 slots in the U phase belt and the 20 slots in the U0 phase belt are alternately arranged every 17 slots.

[0028] The four slot groups of the V-phase belt and the four slot groups of the V0-phase belt are arranged in a pattern with a first pitch of 17 and a second pitch of 17. In each slot combination, the 20 slots in the V-phase belt and the 20 slots in the V0-phase belt are arranged alternately every 17 slots.

[0029] The four slot groups of the W phase belt are combined with the four slot groups of the W0 phase belt according to the rule of 17 first pitch and 17 second pitch. In each slot combination, the 20 slots in the W phase belt and the 20 slots in the W0 phase belt are arranged alternately according to the rule of every 17 slots.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] (1) The present invention provides a symmetrical eight-branch three-phase winding connection method with four hundred and eighty slots and fourteen pairs of poles, which is suitable for large-capacity hydro-turbine generators, especially for large-capacity hydro-turbine generators operating in high-altitude areas. It expands the matching scheme of voltage and branch current, and can meet the design requirements of ventilation systems in high-altitude areas to avoid overheating of the unit due to excessive stator slot current, and can also meet the design requirements of insulation systems in high-altitude areas to avoid corona generation in the stator winding due to excessively high voltage levels.

[0032] (2) The potential amplitude of each of the eight branches in the present invention is equal and the phase is the same, and there is no circulating current between the branches.

[0033] (3) In the present invention, two short jumper wires can be selected for each phase and each branch, and the jumper wires are connected on the same layer, which has a simple structure, is conducive to the lead-out of the main and middle lead-out wires, uses less copper, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The slot star vector diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the long jumper stator winding connection of the present invention;

[0036] Figure 3 This is a schematic diagram of the short jumper stator winding connection of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other unless there is a conflict.

[0038] Example 1

[0039] A method for connecting a three-phase winding with four hundred and eighty slots, fourteen pairs of poles, and eight branches in this embodiment includes the following steps:

[0040] Step 1: Determine the stator winding cycle sequence according to the number of slots per pole and per phase.

[0041] Step 2: Number all stator slots from 1 to 480 in sequence, specify slot 1 as the starting electrical angle, calculate the electrical angles corresponding to the other slots, and draw a slot star vector diagram based on the electrical angle of each slot.

[0042] Step 3. Divide the slot star vector diagram described in step 2 into six phase belts, U, W0, V, U0, W, and V0, according to the cyclic number sequence described in step 1. Each phase belt covers an interval of 60 electrical degrees; the U, V, and W phase belts differ from each other by 120 electrical degrees, the U0, V0, and W0 phase belts differ from each other by 120 electrical degrees, the U phase belt differs from the U0 phase belt by 180 electrical degrees, the V phase belt differs from the V0 phase belt by 180 electrical degrees, and the W phase belt differs from the W0 phase belt by 180 electrical degrees; combine the U phase belt and the U0 phase belt to form a U-phase winding, combine the V phase belt and the V0 phase belt to form a V-phase winding, and combine the W phase belt and the W0 phase belt to form a W-phase winding.

[0043] Step 4: Group the stator slots every 34 slots in each phase band into a group according to the rule of synthetic pitch of 34. Each phase band contains four slot groups, and each slot group contains 20 slots.

[0044] The four slot groups of the U-phase belt are respectively combined with the four slot groups of the U0-phase belt to form four slot combination sets. The two layers of wire rods in the 20 slots of the U-phase belt in each slot combination set are connected with the two layers of wire rods in the 20 slots of the U0-phase belt to form two branches. The four slot groups constitute eight branches of the U-phase winding.

[0045] The four slot groups of the V-phase belt are respectively combined with the four slot groups of the V0-phase belt to form four slot combination sets. The two layers of wire rods in the 20 slots of the V-phase belt in each slot combination set are connected with the two layers of wire rods in the 20 slots of the V0-phase belt to form two branches. The four slot groups constitute eight branches of the V-phase winding.

[0046] The four slot groups of the W phase belt are respectively combined with the four slot groups of the W0 phase belt to form four slot combination sets. The two layers of wire rods in the 20 slots of the W phase belt in each slot combination set are connected with the two layers of wire rods in the 20 slots of the W0 phase belt to form two branches. The four slot groups constitute eight branches of the W phase winding.

[0047] In this way, a three-phase symmetrical eight-branch winding of U, V, and W is formed.

[0048] Specifically, the method of dividing the slot star vector diagram into six phase bands according to the cyclic number sequence in step three is: according to the number of stator slots represented by each number in the cyclic number sequence, the slot numbers of the included stator slots are sequentially allocated to the six phase bands.

[0049] In some optional embodiments, in step 4:

[0050] In each slot combination, the upper wire rods in the 20 slots of the U-phase belt are connected to the lower wire rods in the 20 slots of the U0-phase belt to form a branch, and the lower wire rods in the 20 slots of the U-phase belt are connected to the upper wire rods in the 20 slots of the U0-phase belt to form a branch; in each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch; in each slot combination, the upper wire rods in the 20 slots of the W-phase belt are connected to the lower wire rods in the 20 slots of the W0-phase belt to form a branch, and the lower wire rods in the 20 slots of the W-phase belt are connected to the upper wire rods in the 20 slots of the W0-phase belt to form a branch.

[0051] During wiring, there is a long jumper wire in each branch of each phase. The long jumper wire is a different-layer jumper, with one end connected to the upper layer wire rod and the other end connected to the lower layer wire rod.

[0052] In some optional embodiments, to shorten the length of the jumper wire, in step 4:

[0053] Each slot group in each phase belt is split into two sub-slot groups from the middle, each sub-slot group has 10 slots, and each phase belt has eight sub-slot groups in total. The eight sub-slot groups are recombined into four slot groups in pairs according to the rule that the slot numbers differ by 20, and then the slot groups of the corresponding phase belts are combined accordingly.

[0054] In each slot combination, the upper wire rods in the 20 slots of the U-phase belt are connected to the upper wire rods in the 20 slots of the U0-phase belt to form a branch, and the lower wire rods in the 20 slots of the U-phase belt are connected to the lower wire rods in the 20 slots of the U0-phase belt to form a branch; in each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch; in each slot combination, the upper wire rods in the 20 slots of the W-phase belt are connected to the upper wire rods in the 20 slots of the W0-phase belt to form a branch, and the lower wire rods in the 20 slots of the W-phase belt are connected to the lower wire rods in the 20 slots of the W0-phase belt to form a branch.

[0055] Among them, when two sub-slot groups are combined, they are connected by short jumper wires; there are two short jumper wires in each branch of each phase, and the short jumper wires are same-layer jumpers, with both ends connected to the same-layer wire rods.

[0056] Furthermore, in step 4:

[0057] The four slot groups of the U-phase belt are combined with the four slot groups of the U0-phase belt according to the rule of a first pitch of 17 and a second pitch of 17. In each slot combination, the 20 slots in the U-phase belt and the 20 slots in the U0-phase belt are arranged alternately every 17 slots; the four slot groups of the V-phase belt and the four slot groups of the V0-phase belt are combined with the four slot groups of the W-phase belt according to the rule of a first pitch of 17 and a second pitch of 17. In each slot combination, the 20 slots in the W-phase belt and the 20 slots in the W0-phase belt are arranged alternately every 17 slots.

[0058] Example 2

[0059] Reference Figures 1 to 3 , specifically describing a wiring method for a symmetrical eight-branch three-phase winding with four hundred and eighty slots and fourteen pairs of poles according to this embodiment:

[0060] Step 1. The number of pole pairs p is 14, the number of stator slots Z is 480, and the number of slots per pole per phase q = Z / (6p) = 480 / 84 = 40 / 7. Based on the number of slots per pole per phase q, the stator winding cycle sequence is determined to be 6-6-6-5-6-6-5.

[0061] Step 2: Figure 1 As shown, all stator slots are numbered from 1 to 480, slot 1 is defined as the electrical angle starting angle, and the electrical angles αi corresponding to other slot numbers are calculated respectively:

[0062] (i=1,2,3,…,480)

[0063] Draw a slot star vector diagram based on the electrical angle of each slot.

[0064] Step 3: Figure 1As shown, according to the number of stator slots represented by each number in the cyclic number sequence 6-6-6-5-6-6-5, the slot numbers of the included stator slots are sequentially allocated to the six phase bands U, W0, V, U0, W, and V0 of the slot star vector diagram, and each phase band covers an interval of 60 electrical degrees; the U, V, and W phase bands differ from each other by 120 electrical degrees, the U-phase band differs from the U0-phase band by 180 electrical degrees, the V-phase band differs from the V0-phase band by 180 electrical degrees, and the W-phase band differs from the W0-phase band by 180 electrical degrees; the U-phase band is combined with the U0-phase band to form the U-phase winding, the V-phase band is combined with the V0-phase band to form the V-phase winding, and the W-phase band is combined with the W0-phase band to form the W-phase winding.

[0065] Step 4: Figure 2 As shown, every 34 slots within each phase band are grouped together, with a composite pitch of 34. Each phase band is divided into four slot groups, each containing 20 slots. The upper bars in the corresponding slots are numbered 1 to 480, and the lower bars are numbered 1' to 480', in order of the stator slot numbers.

[0066] According to the rule that the first pitch is 17 and the second pitch is 17, the four slot groups of the U phase belt are correspondingly combined with the four slot groups of the U0 phase belt to form four slot combination sets. In each slot combination set, the 20 slots in the U phase belt and the 20 slots in the U0 phase belt can be arranged alternately every 17 slots. In each slot combination set, the upper wire rods in the 20 slots of the U phase belt are connected with the lower wire rods in the 20 slots of the U0 phase belt to form a branch, and the lower wire rods in the 20 slots of the U phase belt are connected with the upper wire rods in the 20 slots of the U0 phase belt to form a branch. The four slot combination sets constitute a total of eight branches, thus forming the eight branches of the U phase winding. The details are as follows:

[0067] The connection sequence of the first branch of phase U is: 1-464'-447-430'-413-396'-379-362'-345-328'-311-294'-277-260'-243-226'-209-192'-175-158'-141-124'-107-90'-73-56'-39-22'-5-468'-451-434'-417-400'-383-366'-349-332'-315-298'-(jumper wire)-1. Open any position to make a line end to form the first branch winding of phase U.

[0068] The connection sequence of the second branch of phase U is: 1'-464-447'-430-413'-396-379'-362-345'-328-311'-294-277'-260-243'-226-209'-192-175'-158-141'-124-107'-90-73'-56-39'-22-5'-468-451'-434-417'-400-383'-366-349'-332-315'-298-(jumper wire)-1'. Open any position to make a line end to form the second branch winding of phase U.

[0069] The connection sequence of the U-phase third branch is: 121'-104-87'-70-53'-36-19'-2-465'-448-431'-414-397'-380-363'-346-329'-312-295'-278-261'-244-227'-210-193'-176-159'-142-125'-108-91'-74-57'-40-23'-6-469'-452-435'-418-(jumper wire)-121'. Open any position to make a line end to form the U-phase third branch winding.

[0070] The connection sequence of the fourth branch of phase U is: 121-104'-87-70'-53-36'-19-2'-465-448'-431-414'-397-380'-363-346'-329-312'-295-278'-261-244'-227-210'-193-176'-159-142'-125-108'-91-74'-57-40'-23-6'-469-452'-435-418'-(jumper wire)-121. Open any position to make a line end to form the fourth branch winding of phase U.

[0071] The connection sequence of the fifth branch of phase U is: 241-224'-207-190'-173-156'-139-122'-105-88'-71-54'-37-20'-3-466'-449-432'-415-398'-381-364'-347-330'-313-296'-279-262'-245-228'-211-194'-177-160'-143-126'-109-92'-75-58'-(jumper wire)-241. Open any position to make a line end to form the fifth branch winding of phase U.

[0072] The connection sequence of the sixth branch of phase U is: 241'-224-207'-190-173'-156-139'-122-105'-88-71'-54-37'-20-3'-466-449'-432-415'-398-381'-364-347'-330-313'-296-279'-262-245'-228-211'-194-177'-160-143'-126-109'-92-75'-58-(jumper wire)-241'. Open any position to make a line end to form the sixth branch winding of phase U.

[0073] The connection sequence of the U-phase seventh branch is: 361'-344-327'-310-293'-276-259'-242-225'-208-191'-174-157'-140-123'-106-89'-72-55'-38-21'-4-467'-450-433'-416-399'-382-365'-348-331'-314-297'-280-263'-246-229'-212-195'-178-(jumper wire)-361'. Open any position to make a line end to form the U-phase seventh branch winding.

[0074] The connection sequence of the U-phase eighth branch is: 361-344'-327-310'-293-276'-259-242'-225-208'-191-174'-157-140'-123-106'-89-72'-55-38'-21-4'-467-450'-433-416'-399-382'-365-348'-331-314'-297-280'-263-246'-229-212'-195-178'-(jumper wire)-361. Open any position to make a line end to form the U-phase eighth branch winding.

[0075] Similarly, the four slot groups of the V-phase belt and the four slot groups of the V0-phase belt are correspondingly combined according to the rule that the first pitch is 17 and the second pitch is 17, forming four slot combination sets. In each slot combination set, the 20 slots in the V-phase belt and the 20 slots in the V0-phase belt can be arranged alternately according to the rule of every 17 slots. In each slot combination set, the upper wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch. The four slot combination sets constitute a total of eight branches, thus forming the eight branches of the V-phase winding. The details are as follows:

[0076] The connection sequence of the first branch of V phase is: 81-64'-47-30'-13-476'-459-442'-425-408'-391-374'-357-340'-323-306'-289-272'-255-238'-221-204'-187-170'-153-136'-119-102'-85-68'-51-34'-17-480'-463-446'-429-412'-395-378'-(jumper wire)-81. Open any position to make a line end to form the first branch winding of V phase.

[0077] The connection sequence of the second branch of the V phase is: 81'-64-47'-30-13'-476-459'-442-425'-408-391'-374-357'-340-323'-306-289'-272-255'-238-221'-204-187'-170-153'-136-119'-102-85'-68-51'-34-17'-480-463'-446-429'-412-395'-378-(jumper wire)-81'. Open any position to make a line end to form the second branch winding of the V phase.

[0078] The connection sequence of the V-phase third branch is: 201'-184-167'-150-133'-116-99'-82-65'-48-31'-14-477'-460-443'-426-409'-392-375'-358-341'-324-307'-290-273'-256-239'-222-205'-188-171'-154-137'-120-103'-86-69'-52-35'-18-(jumper wire)-201'. Open any position to make a line end to form the V-phase third branch winding.

[0079] The connection sequence of the fourth branch of the V phase is: 201-184'-167-150'-133-116'-99-82'-65-48'-31-14'-477-460'-443-426'-409-392'-375-358'-341-324'-307-290'-273-256'-239-222'-205-188'-171-154'-137-120'-103-86'-69-52'-35-18'-(jumper wire)-201. Open any position to make a line end to form the fourth branch winding of the V phase.

[0080] The connection sequence of the fifth branch of the V phase is: 321-304'-287-270'-253-236'-219-202'-185-168'-151-134'-117-100'-83-66'-49-32'-15-478'-461-444'-427-410'-393-376'-359-342'-325-308'-291-274'-257-240'-223-206'-189-172'-155-138'-(jumper wire)-321. Open any position to make a line end to form the fifth branch winding of the V phase.

[0081] The connection sequence of the sixth branch of the V phase is: 321'-304-287'-270-253'-236-219'-202-185'-168-151'-134-117'-100-83'-66-49'-32-15'-478-461'-444-427'-410-393'-376-359'-342-325'-308-291'-274-257'-240-223'-206-189'-172-155'-138-(jumper wire)-321'. Open any position to make a line end to form the sixth branch winding of the V phase.

[0082] The connection sequence of the V-phase seventh branch is: 441'-424-407'-390-373'-356-339'-322-305'-288-271'-254-237'-220-203'-186-169'-152-135'-118-101'-84-67'-50-33'-16-479'-462-445'-428-411'-394-377'-360-343'-326-309'-292-275'-258-(jumper wire)-441'. Open any position to make a line end to form the V-phase seventh branch winding.

[0083] The connection sequence of the V-phase eighth branch is: 441-424'-407-390'-373-356'-339-322'-305-288'-271-254'-237-220'-203-186'-169-152'-135-118'-101-84'-67-50'-33-16'-479-462'-445-428'-411-394'-377-360'-343-326'-309-292'-275-258'-(jumper wire)-441. Open any position to make a line end to form the V-phase eighth branch winding.

[0084] Similarly, the four slot groups of the W phase belt are correspondingly combined with the four slot groups of the W0 phase belt according to the rule of 17 first pitches and 17 second pitches, forming four slot combination sets. In each slot combination set, the 20 slots in the W phase belt and the 20 slots in the W0 phase belt can be arranged alternately every 17 slots. In each slot combination set, the upper wire rods in the 20 slots of the W phase belt are connected to the lower wire rods in the 20 slots of the W0 phase belt to form a branch, and the lower wire rods in the 20 slots of the W phase belt are connected to the upper wire rods in the 20 slots of the W0 phase belt to form a branch. The four slot combination sets constitute a total of eight branches, thus forming the eight branches of the W phase winding. The details are as follows:

[0085] The connection sequence of the first branch of phase W is: 41'-24-7'-470-453'-436-419'-402-385'-368-351'-334-317'-300-283'-266-249'-232-215'-198-181'-164-147'-130-113'-96-79'-62-45'-28-11'-474-457'-440-423'-406-389'-372-355'-338-(jumper wire)-41'. Open any position to make a line end to form the first branch winding of phase W.

[0086] The connection sequence of the second branch of phase W is: 41-24'-7-470'-453-436'-419-402'-385-368'-351-334'-317-300'-283-266'-249-232'-215-198'-181-164'-147-130'-113-96'-79-62'-45-28'-11-474'-457-440'-423-406'-389-372'-355-338'-(jumper wire)-41. Open any position to make a line end to form the second branch winding of phase W.

[0087] The connection sequence of the W-phase third branch is: 161-144'-127-110'-93-76'-59-42'-25-8'-471-454'-437-420'-403-386'-369-352'-335-318'-301-284'-267-250'-233-216'-199-182'-165-148'-131-114'-97-80'-63-46'-29-12'-475-458'-(jumper wire)-161. Open any position to make a line end to form the W-phase third branch winding.

[0088] The connection sequence of the fourth branch of phase W is: 161'-144-127'-110-93'-76-59'-42-25'-8-471'-454-437'-420-403'-386-369'-352-335'-318-301'-284-267'-250-233'-216-199'-182-165'-148-131'-114-97'-80-63'-46-29'-12-475'-458-(jumper wire)-161'. Open any position to make a line end to form the fourth branch winding of phase W.

[0089] The connection sequence of the fifth branch of phase W is: 281'-264-247'-230-213'-196-179'-162-145'-128-111'-94-77'-60-43'-26-9'-472-455'-438-421'-404-387'-370-353'-336-319'-302-285'-268-251'-234-217'-200-183'-166-149'-132-115'-98-(jumper wire)-281'. Open any position to make a line end to form the fifth branch winding of phase W.

[0090] The connection sequence of the sixth branch of phase W is: 281-264'-247-230'-213-196'-179-162'-145-128'-111-94'-77-60'-43-26'-9-472'-455-438'-421-404'-387-370'-353-336'-319-302'-285-268'-251-234'-217-200'-183-166'-149-132'-115-98'-(jumper wire)-281. Open any position to make a line end to form the sixth branch winding of phase W.

[0091] The connection sequence of the seventh branch of phase W is: 401-384'-367-350'-333-316'-299-282'-265-248'-231-214'-197-180'-163-146'-129-112'-95-78'-61-44'-27-10'-473-456'-439-422'-405-388'-371-354'-337-320'-303-286'-269-252'-235-218'-(jumper wire)-401. Open any position to make a line end to form the seventh branch winding of phase W.

[0092] The connection sequence of the W-phase eighth branch is: 401'-384-367'-350-333'-316-299'-282-265'-248-231'-214-197'-180-163'-146-129'-112-95'-78-61'-44-27'-10-473'-456-439'-422-405'-388-371'-354-337'-320-303'-286-269'-252-235'-218-(jumper wire)-401'. Open any position to make a line end to form the W-phase eighth branch winding.

[0093] like Figure 3 As shown, in order to shorten the length of the jumper wire, each slot group in each phase belt can be split into two sub-slot groups from the middle, each sub-slot group has 10 slots, and each phase belt has eight sub-slot groups in total. According to the rule that the slot numbers differ by 20, the eight sub-slot groups are recombined into four slot groups in pairs. When the two sub-slot groups are combined, they are connected through a short jumper wire. Further, according to the rule that the first pitch is 17 and the second pitch is 17, the four slot groups of the U phase belt are combined with the four slot groups of the U0 phase belt, the four slot groups of the V phase belt are combined with the four slot groups of the V0 phase belt, and the four slot groups of the W phase belt are combined with the four slot groups of the W0 phase belt. Each slot group is concentrated on the same layer of wire rods to connect to form a branch, thus forming a three-phase symmetrical eight-branch winding of U, V, and W. The details are as follows:

[0094] Eight branches of phase U:

[0095] The connection sequence of the first branch of phase U is: 1-464'-447-430'-413-396'-379-362'-345-328'-311-294'-277-260'-243-226'-209-192'-175-158'-(jumper wire)-178'-195-212'-229-246'-263-280'-297-314'-331-348'-365-382'-399-416'-433-450'-467-4'-21-(jumper wire)-1. Open any position to make a line end to form the first branch winding of phase U.

[0096] The connection sequence of the second branch of phase U is: 1'-464-447'-430-413'-396-379'-362-345'-328-311'-294-277' -260-243'-226-209'-192-175'-158-(jumper wire)-178-195'-212-229'-246-263'-280-297'-314-331' -348-365'-382-399'-416-433'-450-467'-4-21'-(jumper wire)-1'. Open any position to make a line end to form the second branch winding of phase U.

[0097] The connection sequence of the U-phase third branch is: 121'-104-87'-70-53'-36-19'-2-465'-448-431'-414-397'-380 -363'-346-329'-312-295'-278-(jumper wire)-298-315'-332-349'-366-383'-400-417'-434-451'-468 -5'-22-39'-56-73'-90-107'-124-141'-(jumper wire)-121'. Open any position to make a line end to form the U-phase third branch winding.

[0098] The connection sequence of the fourth branch of phase U is: 121-104'-87-70'-53-36'-19-2'-465-448'-431-414'-397-380' -363-346'-329-312'-295-278'-(jumper wire)-298'-315-332'-349-366'-383-400'-417-434'-451-468' -5-22'-39-56'-73-90'-107-124'-141-(jumper wire)-121. Open any position to make a line end to form the fourth branch winding of phase U.

[0099] The connection sequence of the fifth branch of phase U is: 241-224'-207-190'-173-156'-139-122'-105-88'-71-54'-37-20' -3-466'-449-432'-415-398'-(jumper wire)-418'-435-452'-469-6'-23-40'-57-74'-91-108'-125-142' -159-176'-193-210'-227-244'-261-(jumper wire)-241. Open any position to make a line end to form the fifth branch winding of phase U.

[0100] The connection sequence of the sixth branch of U phase is: 241'-224-207'-190-173'-156-139'-122-105'-88-71'-54-37'-20-3'-466-449'-432-415'-398-(crossing line)-418-435'-452-469'-6-23'-40-57'-74-91'-108-125'-142-159'-176-193'-210-227'-244-261'-(crossing line)-241', any position is opened to form a wire end, and the sixth branch winding of U phase is formed;

[0101] The connection sequence of the seventh branch of U phase is: 361'-344-327'-310-293'-276-259'-242-225'-208-191'-174-157'-140-123'-106-89'-72-55'-38-(crossing line)-58-75'-92-109-126-143'-160-177'-194-211'-228-245'-262-279'-296-313'-330-347'-364-381'-(crossing line)-361', any position is opened to form a wire end, and the seventh branch winding of U phase is formed;

[0102] The connection sequence of the eighth branch of U phase is: 361-344'-327-310'-293-276'-259-242'-225-208'-191-174'-157-140'-123-106'-89-72'-55-38'-(crossing line)-58'-75-92-109-126'-143-160'-177-194'-211-228'-245-262'-279-296'-313-330'-347-364'-381-(crossing line)-361, any position is opened to form a wire end, and the eighth branch winding of U phase is formed.

[0103] Eight branches of V phase:

[0104] The connection sequence of the first branch of the V phase is: 81-64'-47-30'-13-476'-459-442'-425-408'-391-374'-357-340' -323-306'-289-272'-255-238'-(jumper wire)-258'-275-292'-309-326'-343-360'-377-394'-411-428' -445-462'-479-16'-33-50'-67-84'-101-(jumper wire)-81. Open any position to make a line end to form the first branch winding of the V phase.

[0105] The connection sequence of the second branch of the V phase is: 81'-64-47'-30-13'-476-459'-442-425'-408-391'-374-357'-340 -323'-306-289'-272-255'-238-(jumper wire)-258-275'-292-309'-326-343'-360-377'-394-411'-428 -445'-462-479'-16-33'-50-67'-84-101'-(jumper wire)-81'. Open any position to make a line end to form the second branch winding of the V phase.

[0106] The connection sequence of the V-phase third branch is: -184-167'-150-133'-116-99'-82-65'-48-31'-14-477'-460 -443'-426-409'-392-375'-358-(jumper wire)-378-395'-412-429'-446-463'-480-17'-34-51'-68-85' -102-119'-136-153'-170-187'-204-221'-(jumper wire)-201'. Open any position to make a line end to form the V-phase third branch winding.

[0107] The connection sequence of the fourth branch of the V phase is: 201-184'-167-150'-133-116'-99-82'-65-48'-31-14'-477-460' -443-426'-409-392'-375-358'-(jumper wire)-378'-395-412'-429-446'-463-480'-17-34'-51-68'-85 -102'-119-136'-153-170'-187-204'-221-(jumper wire)-201. Open any position to make a line end to form the fourth branch winding of the V phase.

[0108] The connection sequence of the fifth branch of V phase is: 321-304'-287-270'-253-236'-219-202'-185-168'-151-134'-117-100'-83-66'-49-32'-15-478'- (crossing line)-18'-35-52'-69-86'-103-120'-137-154'-171-188'-205-222'-239-256'-273-290'-307-324'-341- (crossing line)-321, and wire terminals are made by opening any position to form the fifth branch winding of V phase;

[0109] The connection sequence of the sixth branch of V phase is: 321'-304-287'-270-253'-236-219'-202-185'-168-151'-134-117'-100-83'-66-49'-32-15'-478- (crossing line)-18-35'-52-69'-86-103'-120-137'-154-171'-188-205'-222-239'-256-273'-290-307'-324-341'- (crossing line)-321', and wire terminals are made by opening any position to form the sixth branch winding of V phase;

[0110] The connection sequence of the seventh branch of V phase is: 441'-424-407'-390-373'-356-339'-322-305'-288-271'-254-237'-220-203'-186-169'-152-135'-118- (crossing line)-138-155'-172-189'-206-223'-240-257'-274-291'-308-325'-342-359'-376-393'-410-427'-444-461'- (crossing line)-441', and wire terminals are made by opening any position to form the seventh branch winding of V phase;

[0111] The connection sequence of the eighth branch of V phase is: 441-424'-407-390'-373-356'-339-322'-305-288'-271-254'-237-220'-203-186'-169-152'-135-118'- (crossing line)-138'-155-172'-189-206'-223-240'-257-274'-291-308'-325-342'-359-376'-393-410'-427-444'-461- (crossing line)-441, and wire terminals are made by opening any position to form the eighth branch winding of V phase.

[0112] Eight branches of phase W:

[0113] The connection sequence of the first branch of phase W is: 41'-24-7'-470-453'-436-419'-402-385'-368-351'-334-317' -300-283'-266-249'-232-215'-198-(jumper wire)-218-235'-252-269'-286-303'-320-337'-354-371' -388-405'-422-439'-456-473'-10-27'-44-61'-(jumper wire)-41'. Open any position to make a line end to form the first branch winding of phase W.

[0114] The connection sequence of the second branch of phase W is: 41-24'-7-470'-453-436'-419-402'-385-368'-351-334'-317-300' -283-266'-249-232'-215-198'-(jumper wire)-218'-235-252'-269-286'-303-320'-337-354'-371 -388'-405-422'-439-456'-473-10'-27-44'-61-(jumper wire)-41. Open any position to make a line end to form the second branch winding of phase W.

[0115] The connection sequence of the W-phase third branch is: 161-144'-127-110'-93-76'-59-42'-25-8'-471-454'-437-420' -403-386'-369-352'-335-318'-(jumper wire)-338'-355-372'-389-406'-423-440'-457-474'-11-28'-45 -62'-79-96'-113-130'-147-164'-181-(jumper wire)-161. Open any position to make a line end to form the W-phase third branch winding.

[0116] The connection sequence of the fourth branch of phase W is: 161'-144-127'-110-93'-76-59'-42-25'-8-471'-454-437'-420 -403'-386-369'-352-335'-318-(jumper wire)-338-355'-372-389'-406-423'-440-457'-474-11'-28-45' -62-79'-96-113'-130-147'-164-181'-(jumper wire)-161'. Open any position to make a line end to form the fourth branch winding of phase W.

[0117] The connection sequence of the fifth branch of phase W is: 281'-264-247'-230-213'-196-179'-162-145'-128-111'-94-77' -60-43'-26-9'-472-455'-438-(jumper wire)-458-475'-12-29'-46-63'-80-97'-114-131'-148-165'-182 -199'-216-233'-250-267'-284-301'-(jumper wire)-281'. Open any position to make a line end to form the fifth branch winding of phase W.

[0118] The connection sequence of the sixth branch of phase W is: 281-264'-247-230'-213-196'-179-162'-145-128'-111-94'-77 -60'-43-26'-9-472'-455-438'-(jumper wire)-458'-475-12'-29-46'-63-80'-97-114'-131-148'-165-182' -199-216'-233-250'-267-284'-301-(jumper wire)-281. Open any position to make a line end to form the sixth branch winding of phase W.

[0119] The connection sequence of the seventh branch of phase W is: 401-384'-367-350'-333-316'-299-282'-265-248'-231-214' -197-180'-163-146'-129-112'-95-78'-(jumper wire)-98'-115-132'-149-166'-183-200'-217-234'-251 -268'-285-302'-319-336'-353-370'-387-404'-421-(jumper wire)-401. Open any position to make a line end to form the seventh branch winding of phase W.

[0120] The connection sequence of the eighth branch of the W-phase is: 401'-384-367'-350-333'-316-299'-282-265'-248-231'-214-197'-180-163'-146-129'-112-95'-78-(crossing line)-98-115'-132-149'-166-183'-200-217'-234-251'-268-285'-302-319'-336-353'-370-387'-404-421'-(crossing line)-401', opening any position to form a wire end, thereby forming the eighth branch of the W-phase winding.

[0121] Finally, the scope of the present application is not limited to the above-described embodiments. It will be apparent to those skilled in the art that various modifications and changes can be made thereto without departing from the scope and spirit of the present application. If these modifications and changes belong to the scope of the claims of the present application and equivalents thereof, then they are also intended to be within the present application.

Claims

1. A method for connecting a symmetrical eight-branch three-phase winding with four hundred and eighty slots and fourteen pairs of poles, characterized in that: The steps include: Step 1: Determine the stator winding cycle sequence according to the number of slots per pole and per phase; Step 2: Number all stator slots from 1 to 480, specify slot 1 as the starting electrical angle, calculate the electrical angles corresponding to the other slots, and draw a slot star vector diagram based on the electrical angle of each slot; Step 3. Divide the slot star vector diagram described in step 2 into six phase belts, U, W0, V, U0, W, and V0, according to the cyclic number sequence described in step 1. Each phase belt covers an interval of 60 electrical degrees; the U, V, and W phase belts differ from each other by 120 electrical degrees, the U0, V0, and W0 phase belts differ from each other by 120 electrical degrees, the U phase belt differs from the U0 phase belt by 180 electrical degrees, the V phase belt differs from the V0 phase belt by 180 electrical degrees, and the W phase belt differs from the W0 phase belt by 180 electrical degrees; combine the U phase belt and the U0 phase belt to form a U-phase winding, combine the V phase belt and the V0 phase belt to form a V-phase winding, and combine the W phase belt and the W0 phase belt to form a W-phase winding; Step 4: Group the stator slots of each phase band into groups of 34 slots every other 34 slots according to the rule of synthetic pitch of 34. Each phase band contains four slot groups, and each slot group contains 20 slots. Combine the four slot groups of the U-phase belt with the four slot groups of the U0-phase belt to form four slot group sets. In each slot group set, connect the two layers of wire rods in the 20 slots of the U-phase belt with the two layers of wire rods in the 20 slots of the U0-phase belt to form two branches. The four slot groups constitute eight branches of the U-phase winding. Combine the four slot groups of the V-phase belt with the four slot groups of the V0-phase belt to form four slot group sets. In each slot group set, connect the two layers of wire rods in the 20 slots of the V-phase belt with the two layers of wire rods in the 20 slots of the V0-phase belt to form two branches. The four slot groups constitute eight branches of the V-phase winding. The four slot groups of the W phase belt are respectively combined with the four slot groups of the W0 phase belt to form four slot combination sets. The two layers of wire rods in the 20 slots of the W phase belt in each slot combination set are connected with the two layers of wire rods in the 20 slots of the W0 phase belt to form two branches. The four slot groups constitute eight branches of the W phase winding.

2. The method for connecting a symmetrical eight-branch three-phase winding with fourteen pairs of poles and fourteen slots according to claim 1 is characterized in that: The method for dividing the slot star vector diagram into six phase bands according to the cyclic number sequence in step three is: according to the number of stator slots represented by each number in the cyclic number sequence, the slot numbers of the included stator slots are sequentially allocated to the six phase bands.

3. The method for connecting a 480-slot, 14-pole-pair symmetrical, 8-branch three-phase winding according to claim 1, characterized in that: In the step 4: In each slot combination, the upper wire rods in the 20 slots of the U phase belt are connected to the lower wire rods in the 20 slots of the U0 phase belt to form a branch, and the lower wire rods in the 20 slots of the U phase belt are connected to the upper wire rods in the 20 slots of the U0 phase belt to form a branch; In each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch; In each slot combination, the upper wire rods in the 20 slots of the W phase belt are connected to the lower wire rods in the 20 slots of the W0 phase belt to form a branch, and the lower wire rods in the 20 slots of the W phase belt are connected to the upper wire rods in the 20 slots of the W0 phase belt to form a branch.

4. The method for connecting a 480-slot, 14-pole-pair symmetrical, 8-branch three-phase winding according to claim 3, characterized in that: In the step 4, there is a long jumper wire in each branch of each phase, and the long jumper wire is a different-layer jumper, with one end connected to the upper layer wire rod and the other end connected to the lower layer wire rod.

5. The method for connecting a symmetrical eight-branch three-phase winding with fourteen pairs of poles and fourteen slots according to claim 1, characterized in that: In the step 4: To shorten the length of the jumper wire, each slot group in each phase belt is split into two sub-slot groups. Each sub-slot group has 10 slots, and each phase belt has eight sub-slot groups in total. The eight sub-slot groups are recombined into four slot groups in pairs, with the slot numbers differing by 20. The slot groups of the corresponding phase belts are then recombined accordingly. In each slot combination, the upper wire rods in the 20 slots of the U phase belt are connected to the upper wire rods in the 20 slots of the U0 phase belt to form a branch, and the lower wire rods in the 20 slots of the U phase belt are connected to the lower wire rods in the 20 slots of the U0 phase belt to form a branch; In each slot combination, the upper wire rods in the 20 slots of the V-phase belt are connected to the upper wire rods in the 20 slots of the V0-phase belt to form a branch, and the lower wire rods in the 20 slots of the V-phase belt are connected to the lower wire rods in the 20 slots of the V0-phase belt to form a branch. In each slot combination, the upper wire rods in the 20 slots of the W phase belt are connected to the upper wire rods in the 20 slots of the W0 phase belt to form a branch, and the lower wire rods in the 20 slots of the W phase belt are connected to the lower wire rods in the 20 slots of the W0 phase belt to form a branch.

6. The method for connecting a symmetrical eight-branch three-phase winding with four hundred and eighty slots and fourteen pairs of poles according to claim 5, characterized in that: In the step 4, the two sub-slot groups are connected by a short jumper wire when combined; There are two short jumper wires in each branch of each phase. The short jumper wires are same-layer jumpers, with both ends connected to the same-layer wire rods.

7. A method for connecting a 480-slot, 14-pole-pair symmetrical, 8-branch three-phase winding according to any one of claims 3 to 6, characterized in that: In the step 4: The four slot groups of the U phase belt are combined with the four slot groups of the U0 phase belt in a pattern of 17 first pitches and 17 second pitches. In each slot combination, the 20 slots in the U phase belt and the 20 slots in the U0 phase belt are alternately arranged every 17 slots. The four slot groups of the V-phase belt and the four slot groups of the V0-phase belt are arranged in a pattern with a first pitch of 17 and a second pitch of 17. In each slot combination, the 20 slots in the V-phase belt and the 20 slots in the V0-phase belt are arranged alternately every 17 slots. The four slot groups of the W phase belt are combined with the four slot groups of the W0 phase belt according to the rule of 17 first pitch and 17 second pitch. In each slot combination, the 20 slots in the W phase belt and the 20 slots in the W0 phase belt are arranged alternately according to the rule of every 17 slots.

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