3,180-slot and twenty-eight-pole symmetrical eight-branch three-phase half-wave winding connection method
By using the wire rod as the smallest unit of the branch and connecting it with the same number, ensuring the symmetrical design of the eight-branch circuit of the twenty-eight pole motor, the design difficulties in the prior art are solved, and a more stable motor operation and reduced insulation design are achieved. Difficulty.
Patent Information
- Application Number
- CN202411603608.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-02-18
AI Technical Summary
In the prior art, it is difficult to design a symmetrical eight-branch three-phase half-wave winding, resulting in problems such as heating of the stator winding and increasing unit vibration.
Line rods are used as the smallest unit to form the branch. Each branch is connected by the same number of line rods to ensure that the composite potential amplitude and phase of the eight branches are equal, and the branch windings are symmetrical to avoid branch circulation.
The symmetrical eight-branch design of the twenty-eight-pole motor is realized, which reduces the heating of the stator winding and unit vibration, improves the stability of the motor operation, and reduces the difficulty of stator voltage and insulation design.
Smart Images
Figure CN119483028A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of AC windings, and in particular relates to a connection method for a 384-slot, 28-pole, symmetrical, eight-branch, three-phase half-wave winding. Background Art
[0002] The stator winding is an important component for realizing electromechanical energy conversion, and directly affects the various performances of the motor. According to the traditional AC motor winding theory, the number of parallel branches of the stator winding a must be a factor of the number of motor poles 2p, that is, 2p / a is an integer. Therefore, for a twenty-eight-pole motor, there is no 8-branch design. However, for large-capacity generators, such as hydro-turbine generators above 700MW, it is more appropriate to design the stator winding into 8 branches. On the one hand, the stator slot current can be controlled within the design experience range of air-cooled units, and on the other hand, the stator voltage can be reduced, reducing the difficulty of stator winding insulation design.
[0003] In the prior art, each phase winding is composed of a pole-phase group or a unit motor (0.5 unit motor when the denominator of the fractional slot is an odd number) as the minimum unit of the branch. The number of branch minimum units is at most equal to the number of motor poles. The branch minimum units are combined in series and parallel to form each branch. It is required that the synthetic potential vector of each branch is equal in size and phase, that is, it is required that the branch minimum units contained in each branch are equal. At this time, the number of branches that can be formed must be a factor of the number of poles. For a twenty-eight-pole motor, it contains at most 28 branch minimum units. The number of symmetrical branches that can be formed by these branch minimum units through series and parallel combination is: 1, 2, 4, 7, 18, 28. It can be seen that there is no 8-branch solution. If connected into 8 branches according to the traditional method, the number of branch minimum units contained in each branch is not equal, the amplitude and phase of the synthetic potential of each branch are evenly distributed and equal, and each branch is asymmetric. Even when operating under ideal conditions, there are branch circulations between the branches, causing problems such as heating of the stator winding and increased vibration of the unit. Summary of the invention
[0004] The present invention is to solve the above-mentioned problems existing in the prior art and provides a connection method for a three-phase half-wave winding with 384 slots and 28 poles and symmetrical eight branches. The present invention uses wire rods as the smallest unit of the branches, and each branch is connected by the same number of wire rods. The synthetic potential amplitudes and phases of the eight branches are equal, the branch windings are symmetrical, and there is no circulating current between the branches. The wire rods contained in each branch winding of the present invention are concentratedly distributed in a 180° space in a predetermined sub-circular direction, which is a half-wave winding, which is beneficial to compensate for the magnetic pull caused by uneven air gap.
[0005] A connection method for a three-hundred-eight-slot, twenty-eight-pole, eight-branch three-phase half-wave winding, the connection method specifically comprising:
[0006] S1. Number all slots from 1 to 384, fill in the grid diagram with 28 slots as a row, use 5-5-4-5-4-5-4 as the cycle number, draw a block diagram in the order of phase belts A, Z, B, X, C, Y, and form the phase belt boundary lines.
[0007] S2. In order to shorten the length of the winding inter-pole connecting wire, interchange the phase belts of No. 56 and No. 83, No. 88 and No. 115, No. 120 and No. 147, No. 152 and No. 179, No. 184 and No. 211, No. 216 and No. 243, No. 248 and No. 275, No. 280 and No. 307, No. 312 and No. 339, No. 344 and 371, No. 376 and No. 19, No. 24 and No. 51 to form a new block diagram.
[0008] S3. In the A and X phase bands, starting from the upper wire bars or lower wire bars of slots 83, 88, 179, 184, 275, 280, 371, and 376 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase A, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase A.
[0009] In the B and Y phase bands, starting with the upper wire bars or lower wire bars of slots 56, 147, 152, 243, 248, 339, 344, and 51 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase B, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase B.
[0010] In the C and Z phase bands, starting with the upper wire bars or lower wire bars of slots 115, 120, 211, 216, 307, 312, 19, and 24 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase C, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase C.
[0011] S4. On the same side of the winding, open any position of each branch to make the branch outlet terminal.
[0012] Specifically, in S3, the method of connecting the 16 half-branch windings of phase A in series in pairs is as follows: the half-branch windings starting from slots 83 and 280 are grouped together, the half-branch windings starting from slots 88 and 275 are grouped together, the half-branch windings starting from slots 179 and 376 are grouped together, and the half-branch windings starting from slots 184 and 371 are grouped together. In each group, a half-branch winding starting from an upper wire bar and a half-branch winding starting from a lower wire bar are connected in series to form two branches.
[0013] The method of connecting the 16 half-branch windings of phase B in series in pairs is as follows: the half-branch windings starting from slots 147 and 344 are grouped together, the half-branch windings starting from slots 152 and 339 are grouped together, the half-branch windings starting from slots 243 and 56 are grouped together, and the half-branch windings starting from slots 248 and 51 are grouped together. In each group, a half-branch winding starting from an upper wire bar and a half-branch winding starting from a lower wire bar are connected in series to form two branches.
[0014] The method of connecting the 16 half-branch windings of phase C in series in pairs is as follows: the half-branch windings starting from slots 211 and 24 are grouped together, the half-branch windings starting from slots 216 and 19 are grouped together, the half-branch windings starting from slots 307 and 120 are grouped together, and the half-branch windings starting from slots 312 and 115 are grouped together. In each group, a half-branch winding starting from an upper wire bar and a half-branch winding starting from a lower wire bar are connected in series to form two branches.
[0015] Specifically, in S3, the series connection position of the two half-branch windings is realized by using inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] (1) The present invention provides a method for connecting a symmetrical eight-branch half-wave winding of a 384-slot 28-pole motor, which can be used to design a 28-pole three-phase symmetrical eight-branch motor, thereby improving the design rationality of large generators, especially hydro-turbine generators above 700MW. The stator slot current can be controlled within the design experience range of air-cooled units, which is also beneficial to reducing the stator voltage, thereby reducing the difficulty of stator winding insulation design and reducing the risk of corona at the stator end.
[0018] (2) The eight branches in the present invention satisfy the requirements of equal potential amplitude and phase, symmetrical branch windings, and no circulating current between the branches after parallel connection. Compared with the asymmetric eight branches, the problems of stator winding heating and increased unit vibration caused by branch circulating current are avoided, thereby improving the stability of motor operation.
[0019] (3) The wire rods contained in each branch winding of the present invention are concentratedly distributed within a space of about 180° in the circumferential direction of the stator to form a half-wave winding, which is beneficial for compensating the magnetic pull caused by uneven air gap.
[0020] (4) Each branch of the present invention contains 2 inter-pole connecting wires, and the entire motor has a total of 48. The length of the inter-pole connecting wire is 13 slots, which is equivalent to the length of the inter-pole connecting wire of the conventional stacked winding, and the winding connection is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a block diagram of the present invention.
[0022] Figure 2 This is a new block diagram after the phase bands to which 24 slots belong are interchanged in the present invention.
[0023] Figure 3 This is the connection diagram of the eight branch windings of phase A of the present invention.
[0024] Figure 4 This is the connection diagram of the eight branch windings of phase B of the present invention.
[0025] Figure 5 This is the connection diagram of the eight branch windings of phase C of the present invention. DETAILED DESCRIPTION
[0026] 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, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to 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 without conflict.
[0027] Specific implementation method 1: A 384-slot, 28-pole, symmetrical, eight-branch, three-phase half-wave winding connection method described in this implementation is specifically as follows:
[0028] S1. Number all slots from 1 to 384, fill in the grid diagram with 28 slots as a row, use 5-5-4-5-4-5-4 as the cycle number, draw a block diagram in the order of phase belts A, Z, B, X, C, Y, and form the phase belt boundary lines.
[0029] S2. In order to shorten the length of the winding inter-pole connecting wire, interchange the phase belts of No. 56 and No. 83, No. 88 and No. 115, No. 120 and No. 147, No. 152 and No. 179, No. 184 and No. 211, No. 216 and No. 243, No. 248 and No. 275, No. 280 and No. 307, No. 312 and No. 339, No. 344 and 371, No. 376 and No. 19, No. 24 and No. 51 to form a new block diagram.
[0030] S3. In the A and X phase bands, starting from the upper wire bars or lower wire bars of slots 83, 88, 179, 184, 275, 280, 371, and 376 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase A, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase A.
[0031] In the B and Y phase bands, starting with the upper wire bars or lower wire bars of slots 56, 147, 152, 243, 248, 339, 344, and 51 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase B, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase B.
[0032] In the C and Z phase bands, starting with the upper wire bars or lower wire bars of slots 115, 120, 211, 216, 307, 312, 19, and 24 respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase C, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase C.
[0033] S4. On the same side of the winding, open any position of each branch to make the branch outlet terminal.
[0034] Specifically, the method of connecting the 16 half-branch windings of phase A in series in pairs is as follows: the method of connecting the 16 half-branch windings of phase A in series in pairs is as follows: the half-branch windings starting from the upper and lower wire rods of slot No. 83 are numbered 1 and 2, the half-branch windings starting from the upper and lower wire rods of slot No. 280 are numbered 3 and 4, the half-branch windings starting from the upper and lower wire rods of slot No. 275 are numbered 5 and 6, the half-branch windings starting from the upper and lower wire rods of slot No. 88 are numbered 7 and 8, the half-branch windings starting from the upper and lower wire rods of slot No. 179 are numbered 9 and 10, the half-branch windings starting from the upper and lower wire rods of slot No. 376 are numbered 11 and 12, and the half-branch windings starting from the upper and lower wire rods of slot No. 371 are numbered 13. and 14, the half-branch windings starting from the upper and lower wire bars of slot No. 184 are numbered 15 and 16, half-branch winding 1 and half-branch winding 4 are connected in series to form the first branch of phase A, half-branch winding 2 and half-branch winding 3 are connected in series to form the second branch of phase A, half-branch winding 5 and half-branch winding 8 are connected in series to form the third branch of phase A, half-branch winding 6 and half-branch winding 7 are connected in series to form the fourth branch of phase A, half-branch winding 9 and half-branch winding 12 are connected in series to form the fifth branch of phase A, half-branch winding 10 and half-branch winding 11 are connected in series to form the sixth branch of phase A, half-branch winding 13 and half-branch winding 16 are connected in series to form the seventh branch of phase A, and half-branch winding 14 and half-branch winding 15 are connected in series to form the eighth branch of phase A.
[0035] The method of connecting the 16 half-branch windings of phase B in series in pairs is as follows: the half-branch winding starting from the upper and lower wire bars of slot No. 147 is numbered 1 and 2, the half-branch winding starting from the upper and lower wire bars of slot No. 334 is numbered 3 and 4, the half-branch winding starting from the upper and lower wire bars of slot No. 339 is numbered 5 and 6, the half-branch winding starting from the upper and lower wire bars of slot No. 152 is numbered 7 and 8, the half-branch winding starting from the upper and lower wire bars of slot No. 243 is numbered 9 and 10, the half-branch winding starting from the upper and lower wire bars of slot No. 56 is numbered 11 and 12, the half-branch winding starting from the upper and lower wire bars of slot No. 51 is numbered 13 and 14, and the half-branch winding starting from the upper and lower wire bars of slot No. 248 is numbered 15 and 16. , the half-branch windings starting from the lower layer of wire bars are numbered 15 and 16, half-branch winding 1 and half-branch winding 4 are connected in series to form the first branch of phase B, half-branch winding 2 and half-branch winding 3 are connected in series to form the second branch of phase B, half-branch winding 5 and half-branch winding 8 are connected in series to form the third branch of phase B, half-branch winding 6 and half-branch winding 7 are connected in series to form the fourth branch of phase B, half-branch winding 9 and half-branch winding 12 are connected in series to form the fifth branch of phase B, half-branch winding 10 and half-branch winding 11 are connected in series to form the sixth branch of phase B, half-branch winding 13 and half-branch winding 16 are connected in series to form the seventh branch of phase B, and half-branch winding 14 and half-branch winding 15 are connected in series to form the eighth branch of phase B.
[0036] The method of connecting the 16 half-branch windings of phase C in series in pairs is as follows: the half-branch winding starting from the upper and lower wire rods of slot 211 is numbered 1 and 2, the half-branch winding starting from the upper and lower wire rods of slot 24 is numbered 3 and 4, the half-branch winding starting from the upper and lower wire rods of slot 19 is numbered 5 and 6, the half-branch winding starting from the upper and lower wire rods of slot 216 is numbered 7 and 8, the half-branch winding starting from the upper and lower wire rods of slot 307 is numbered 9 and 10, the half-branch winding starting from the upper and lower wire rods of slot 120 is numbered 11 and 12, the half-branch winding starting from the upper and lower wire rods of slot 115 is numbered 13 and 14, and the half-branch winding starting from the upper and lower wire rods of slot 312 is numbered 15 and 16. , the half-branch windings starting from the lower layer of wire bars are numbered 15 and 16, half-branch winding 1 and half-branch winding 4 are connected in series to form the first branch of phase C, half-branch winding 2 and half-branch winding 3 are connected in series to form the second branch of phase C, half-branch winding 5 and half-branch winding 8 are connected in series to form the third branch of phase C, half-branch winding 6 and half-branch winding 7 are connected in series to form the fourth branch of phase C, half-branch winding 9 and half-branch winding 12 are connected in series to form the fifth branch of phase C, half-branch winding 10 and half-branch winding 11 are connected in series to form the sixth branch of phase C, half-branch winding 13 and half-branch winding 16 are connected in series to form the seventh branch of phase C, and half-branch winding 14 and half-branch winding 15 are connected in series to form the eighth branch of phase C.
[0037] Specifically, the series connection position of the two half-branch windings is achieved by using inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.
[0038] For a 384-slot 28-pole motor, the present invention uses 5-5-4-5-4-5-4 as the cycle number, and divides all the slots into six phase belts in the order of A, Z, B, X, C, and Y. Each phase belt occupies an electrical angle of 60°, and the A phase belt and the X phase belt constitute the A phase winding, the B phase belt and the Y phase belt constitute the B phase winding, and the C phase belt and the Z phase belt constitute the C phase winding. The phase windings differ by 120 degrees, and are three-phase symmetrical windings; there are 256 wire rods in each phase, and their potential amplitudes are equal. The potential phases can be divided into 32 types, and there are 8 wire rods for each potential phase. The connection method of the present invention ensures that the 8 wire rods for each potential phase are respectively located in 8 branches, so the synthetic potentials of the wire rods contained in the 8 branches after connection are equal in magnitude and phase, and are symmetrical 8-branch windings.
[0039] Specific implementation method 2: refer to Figures 1 to 5 Specifically describe this embodiment, a 384-slot 28-pole symmetrical eight-branch half-wave winding connection method described in this embodiment:
[0040] S1, such as Figure 1 As shown, all slots are numbered from 1 to 384, and filled into the grid diagram with 28 slots as a horizontal row. With 5-5-4-5-4-5-4 as the cycle number, a block diagram is drawn in the phase belt sequence of A, Z, B, X, C, and Y to form the phase belt boundary lines.
[0041] S2, such as Figure 2 As shown, in order to shorten the length of the winding inter-pole connecting wires, No. 56 and No. 83, No. 88 and No. 115, No. 120 and No. 147, No. 152 and No. 179, No. 184 and No. 211, No. 216 and No. 243, No. 248 and No. 275, No. 280 and No. 307, No. 312 and No. 339, No. 344 and 371, No. 376 and No. 19, and No. 24 and No. 51 are interchanged to form a new block diagram.
[0042] S3, such as Figure 3As shown, in the slots contained in the A-phase belt and the X-phase belt, 8 upper-layer wire bars and 8 lower-layer wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14, forming 16 A-phase half-branch windings. Among them, the one starting from the upper wire bar of slot No. 83 is numbered as A-phase half-branch winding 1; the one starting from the lower wire bar of slot No. 83 is numbered as A-phase half-branch winding 2; the one starting from the upper wire bar of slot No. 280 is numbered as A-phase half-branch winding 3, and the one starting from the lower wire bar of slot No. 280 is numbered as A-phase half-branch winding 4; the one starting from the upper wire bar of slot No. 275 is numbered as A-phase half-branch winding 5; the one starting from the lower wire bar of slot No. 275 is numbered as A-phase half-branch winding 6; the one starting from the upper wire bar of slot No. 88 is numbered as A-phase half-branch winding 7, and the one starting from the lower wire bar of slot No. 88 is numbered as A-phase half-branch winding 8; the one starting from the upper wire bar of slot No. 179 is numbered as A-phase half-branch winding 9; The wires starting from the lower wire bar are numbered as A-phase half-branch winding 10; the wires starting from the upper wire bar of slot No. 376 are numbered as A-phase half-branch winding 11, and the wires starting from the lower wire bar of slot No. 376 are numbered as A-phase half-branch winding 12; the wires starting from the upper wire bar of slot No. 371 are numbered as A-phase half-branch winding 13; the wires starting from the lower wire bar of slot No. 371 are numbered as A-phase half-branch winding 14; the wires starting from the upper wire bar of slot No. 184 are numbered as A-phase half-branch winding 15, and the wires starting from the lower wire bar of slot No. 184 are numbered as A-phase half-branch winding 16; among them, the wires with "()" are lower wire bars, and the wires without "()" are upper wire bars, "-" represents that the wire bars are directly connected with parallel head sleeves, and "||" represents the outlet position;
[0043] The A-phase half-branch winding 1 and the A-phase half-branch winding 4 are connected in series to form the A-phase 1st branch winding; the A-phase half-branch winding 2 and the A-phase half-branch winding 3 are connected in series to form the A-phase 2nd branch winding; the A-phase half-branch winding 5 and the A-phase half-branch winding 8 are connected in series to form the A-phase 3rd branch winding; the A-phase half-branch winding 6 and the A-phase half-branch winding 7 are connected in series to form the A-phase 4th branch winding; the A-phase half-branch winding 7 and the A-phase half-branch winding 8 are connected in series to form the A-phase 4th branch winding; the A-phase half-branch winding 7 and the A-phase half-branch winding 8 are connected in series to form the A-phase 4th branch winding. The branch winding 9 and the A-phase half-branch winding 12 are connected in series to form the A-phase 5th branch winding; the A-phase half-branch winding 10 and the A-phase half-branch winding 11 are connected in series to form the A-phase 6th branch winding; the A-phase half-branch winding 13 and the A-phase half-branch winding 16 are connected in series to form the A-phase 7th branch winding; the A-phase half-branch winding 14 and the A-phase half-branch winding 15 are connected in series to form the A-phase 8th branch winding; wherein The representative bars are connected by inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.
[0044] like Figure 4As shown, in the slots contained in the B-phase belt and the Y-phase belt, 8 upper-layer wire bars and 8 lower-layer wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14, forming 16 B-phase half-branch windings. Among them, the one starting from the upper wire rod of slot No. 147 is numbered as B-phase half-branch winding 1; the one starting from the lower wire rod of slot No. 147 is numbered as B-phase half-branch winding 2; the one starting from the upper wire rod of slot No. 344 is numbered as B-phase half-branch winding 3, and the one starting from the lower wire rod of slot No. 344 is numbered as B-phase half-branch winding 4; the one starting from the upper wire rod of slot No. 339 is numbered as B-phase half-branch winding 5; the one starting from the lower wire rod of slot No. 339 is numbered as B-phase half-branch winding 6; the one starting from the upper wire rod of slot No. 152 is numbered as B-phase half-branch winding 7, and the one starting from the lower wire rod of slot No. 152 is numbered as B-phase half-branch winding 8; the one starting from the upper wire rod of slot No. 243 is numbered as B-phase half-branch winding 9; Starting from the lower wire bar of slot 43, it is numbered as B-phase half-branch winding 10; starting from the upper wire bar of slot 56, it is numbered as B-phase half-branch winding 11, and starting from the lower wire bar of slot 56, it is numbered as B-phase half-branch winding 12; starting from the upper wire bar of slot 51, it is numbered as B-phase half-branch winding 13; starting from the lower wire bar of slot 51, it is numbered as B-phase half-branch winding 14; starting from the upper wire bar of slot 248, it is numbered as B-phase half-branch winding 15, and starting from the lower wire bar of slot 248, it is numbered as B-phase half-branch winding 16; among them, those with "()" are lower wire bars, and those without "()" are upper wire bars, "-" represents that the wire bars are directly connected with parallel head sleeves, and "||" represents the outlet position;
[0045] The B-phase half-branch winding 1 and the B-phase half-branch winding 4 are connected in series to form the B-phase 1st branch winding; the B-phase half-branch winding 2 and the B-phase half-branch winding 3 are connected in series to form the B-phase 2nd branch winding; the B-phase half-branch winding 5 and the B-phase half-branch winding 8 are connected in series to form the B-phase 3rd branch winding; the B-phase half-branch winding 6 and the B-phase half-branch winding 7 are connected in series to form the B-phase 4th branch winding; the B-phase half-branch winding 7 and the B-phase half-branch winding 8 are connected in series to form the B-phase 4th branch winding; The branch winding 9 and the B-phase half-branch winding 12 are connected in series to form the 5th branch winding of the B-phase; the B-phase half-branch winding 10 and the B-phase half-branch winding 11 are connected in series to form the 6th branch winding of the B-phase; the B-phase half-branch winding 13 and the B-phase half-branch winding 16 are connected in series to form the 7th branch winding of the B-phase; the B-phase half-branch winding 14 and the B-phase half-branch winding 15 are connected in series to form the 8th branch winding of the B-phase; wherein The representative bars are connected by inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.
[0046] like Figure 5As shown, in the slots contained in the C-phase belt and the Y-phase belt, 8 upper-layer wire bars and 8 lower-layer wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14, forming 16 C-phase half-branch windings. Among them, the one starting from the upper wire rod of slot No. 211 is numbered as C-phase half-branch winding 1; the one starting from the lower wire rod of slot No. 211 is numbered as C-phase half-branch winding 2; the one starting from the upper wire rod of slot No. 24 is numbered as C-phase half-branch winding 3, and the one starting from the lower wire rod of slot No. 24 is numbered as C-phase half-branch winding 4; the one starting from the upper wire rod of slot No. 19 is numbered as C-phase half-branch winding 5; the one starting from the lower wire rod of slot No. 19 is numbered as C-phase half-branch winding 6; the one starting from the upper wire rod of slot No. 216 is numbered as C-phase half-branch winding 7, and the one starting from the lower wire rod of slot No. 216 is numbered as C-phase half-branch winding 8; the one starting from the upper wire rod of slot No. 307 is numbered as C-phase half-branch winding 9; The one starting from the lower wire bar is numbered as C-phase half-branch winding 10; the one starting from the upper wire bar of slot No. 120 is numbered as C-phase half-branch winding 11, and the one starting from the lower wire bar of slot No. 120 is numbered as C-phase half-branch winding 12; the one starting from the upper wire bar of slot No. 115 is numbered as C-phase half-branch winding 13; the one starting from the lower wire bar of slot No. 115 is numbered as C-phase half-branch winding 14; the one starting from the upper wire bar of slot No. 312 is numbered as C-phase half-branch winding 15, and the one starting from the lower wire bar of slot No. 312 is numbered as C-phase half-branch winding 16; among them, the one with "()" is the lower wire bar, and the one without "()" is the upper wire bar, "-" represents that the wire bars are directly connected with parallel head sleeves, and "||" represents the outlet position;
[0047] The C-phase half-branch winding 1 and the C-phase half-branch winding 4 are connected in series to form the C-phase 1st branch winding; the C-phase half-branch winding 2 and the C-phase half-branch winding 3 are connected in series to form the C-phase 2nd branch winding; the C-phase half-branch winding 5 and the C-phase half-branch winding 8 are connected in series to form the C-phase 3rd branch winding; the C-phase half-branch winding 6 and the C-phase half-branch winding 7 are connected in series to form the C-phase 4th branch winding; the C-phase half-branch winding 7 and the C-phase half-branch winding 8 are connected in series to form the C-phase 4th branch winding; the C-phase half-branch winding 7 and the C-phase half-branch winding 8 are connected in series to form the C-phase 4th branch winding. The branch winding 9 and the C-phase half-branch winding 12 are connected in series to form the C-phase 5th branch winding; the C-phase half-branch winding 10 and the C-phase half-branch winding 11 are connected in series to form the C-phase 6th branch winding; the C-phase half-branch winding 13 and the C-phase half-branch winding 16 are connected in series to form the C-phase 7th branch winding; the C-phase half-branch winding 14 and the C-phase half-branch winding 15 are connected in series to form the C-phase 8th branch winding; wherein The representative bars are connected by inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.
[0048] S4. On the same side of the winding, open any position of each branch to make the branch outlet terminal.
[0049] like Figure 3 As shown, the positions of the outgoing wire terminals of the eight branches of phase A are: No. 195 upper wire bar and No. 209 lower wire bar, No. 181 upper wire bar and No. 195 lower wire bar, No. 359 upper wire bar and No. 373 lower wire bar, No. 345 upper wire bar and No. 359 lower wire bar, No. 263 upper wire bar and No. 277 lower wire bar, No. 277 upper wire bar and No. 291 lower wire bar, No. 71 upper wire bar and No. 85 lower wire bar, No. 85 upper wire bar and No. 99 lower wire bar;
[0050] like Figure 4 As shown, the positions of the outgoing wire terminals of the eight branches of phase B are: No. 259 upper wire bar and No. 273 lower wire bar, No. 245 upper wire bar and No. 259 lower wire bar, No. 39 upper wire bar and No. 53 lower wire bar, No. 25 upper wire bar and No. 39 lower wire bar, No. 327 upper wire bar and No. 341 lower wire bar, No. 341 upper wire bar and No. 355 lower wire bar, No. 135 upper wire bar and No. 149 lower wire bar, No. 149 upper wire bar and No. 163 lower wire bar;
[0051] like Figure 5 As shown, the positions of the outgoing line terminals of the eight branches of phase C are: No. 323 upper wire bar and No. 337 lower wire bar, No. 309 upper wire bar and No. 323 lower wire bar, No. 103 upper wire bar and No. 117 lower wire bar, No. 89 upper wire bar and No. 103 lower wire bar, No. 7 upper wire bar and No. 21 lower wire bar, No. 21 upper wire bar and No. 35 lower wire bar, No. 199 upper wire bar and No. 213 lower wire bar, No. 213 upper wire bar and No. 227 lower wire bar.
[0052] In the description of the present invention, it should be understood that the terms "upper", "lower", "first", "second", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified and limited.
[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for connecting a three-phase half-wave winding with 384 slots, 28 poles and symmetrical eight branches, characterized in that: The half-wave winding is obtained by the following steps: S1. Number all slots from 1 to 384, fill in the grid diagram with 28 slots as a row, use 5-5-4-5-4-5-4 as the cycle number, draw a block diagram in the order of phase belts A, Z, B, X, C, Y, and form the phase belt boundary line; S2. In order to shorten the length of the winding inter-pole connection line, interchange the phase belts of No. 56 and No. 83, No. 88 and No. 115, No. 120 and No. 147, No. 152 and No. 179, No. 184 and No. 211, No. 216 and No. 243, No. 248 and No. 275, No. 280 and No. 307, No. 312 and No. 339, No. 344 and No. 371, No. 376 and No. 19, No. 24 and No. 51 to form a new block diagram; S3. In the A and X phase bands, starting from the upper wire bars or lower wire bars of slots 83, 88, 179, 184, 275, 280, 371, and 376, respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14 to form 16 half-branch windings of phase A, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of phase A; In the B and Y phase bands, starting from the upper wire bars or lower wire bars of slots No. 56, 147, 152, 243, 248, 339, 344, and 51, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14, so as to form 16 half-branch windings of the B phase, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of the B phase; In the C and Z phase bands, starting from the upper wire bars or lower wire bars of slots No. 115, 120, 211, 216, 307, 312, 19, and 24, respectively, 8 upper wire bars and 8 lower wire bars are connected in sequence according to the rule that the first pitch is 14 and the second pitch is 14, so as to form 16 half-branch windings of the C phase, and then the 16 half-branch windings are connected in series in pairs to form 8 branch windings of the C phase; S4. On the same side of the winding, open any position of each branch to make the branch outlet terminal.
2. A method for connecting a three-hundred-eight-slot, twenty-eight-pole, symmetrical eight-branch three-phase half-wave winding as claimed in claim 1, characterized in that: In S3, the half-branch windings starting from slots 83 and 280 are grouped together, the half-branch windings starting from slots 88 and 275 are grouped together, the half-branch windings starting from slots 179 and 376 are grouped together, and the half-branch windings starting from slots 184 and 371 are grouped together. In each group, a half-branch winding starting from an upper layer wire bar and a half-branch winding starting from a lower layer wire bar are connected in series to form two branches. The method of connecting the 16 half-branch windings of phase B in series in pairs is as follows: the half-branch windings starting from slots 147 and 344 are grouped together, the half-branch windings starting from slots 152 and 339 are grouped together, the half-branch windings starting from slots 243 and 56 are grouped together, and the half-branch windings starting from slots 248 and 51 are grouped together. In each group, a half-branch winding starting from an upper layer wire bar and a half-branch winding starting from a lower layer wire bar are connected in series to form two branches. The method of connecting the 16 half-branch windings of phase C in series in pairs is as follows: the half-branch windings starting from slots 211 and 24 are grouped together, the half-branch windings starting from slots 216 and 19 are grouped together, the half-branch windings starting from slots 307 and 120 are grouped together, and the half-branch windings starting from slots 312 and 115 are grouped together. In each group, a half-branch winding starting from an upper wire bar and a half-branch winding starting from a lower wire bar are connected in series to form two branches.
3. A method for connecting a three-hundred-eight-slot, twenty-eight-pole, symmetrical eight-branch three-phase half-wave winding as claimed in claim 1, characterized in that: In S3, the wire bars contained in each branch winding are concentrated in a space of about 180° in the circumferential direction of the stator, which is a half-wave winding.
4. A method for connecting a three-hundred-eight-slot, twenty-eight-pole, symmetrical eight-branch three-phase half-wave winding as claimed in claim 1, characterized in that: The three-phase potential amplitudes of the winding are equal and the phase difference is 120°. The potential amplitudes of each phase and each branch are equal and the phase is the same.
5. A method for connecting a three-hundred-eight-slot, twenty-eight-pole, symmetrical eight-branch three-phase half-wave winding as claimed in claim 2, characterized in that: The series connection position of the two half-branch windings is achieved by using inter-pole jumper wires, the length of the inter-pole jumper wires is 13 slots, and each branch contains 2 inter-pole jumper wires.