Wiring method of 264-slot 22-pole symmetrical four-branch double-layer three-phase winding

Abstract

The present invention relates to the technical field of connection of three-phase double-layer symmetrical windings, and in particular to a connection method of a two-hundred-sixty-four-slot twenty-two-pole symmetrical four-branch double-layer three-phase winding, which uses the potential vectors of five hundred and twenty-eight wire rods of the stator winding as separate vectors and adopts a 0.5-layer coil connection method, that is, half of the upper wire rods and half of the lower wire rods in one branch; the remaining half of the upper and lower wire rods belong to another branch. Through this connection method, a two-hundred-sixty-four-slot twenty-two-pole symmetrical winding is realized, which meets the hydraulic speed requirements of the unit and improves the hydraulic performance; meets the electromagnetic load level of the air-cooled motor, and achieves the purpose of reducing the cost of the generator.

Description

Technical Field

[0001] The present invention relates to the technical field of connection of three-phase double-layer symmetrical windings, and in particular to a connection method of a two-hundred-sixty-four-slot, twenty-two-pole, four-branch double-layer three-phase winding. Background Art

[0002] Pumped-storage power stations have the functions of peak shaving, phase adjustment, frequency regulation and emergency standby. Pumped-storage motors have two working conditions: power generation and motor operation. They have the characteristics of frequent start and stop, bidirectional rotation and high speed, and their design is relatively difficult. The superior performance of the pump-turbine of the pumped-storage unit with a speed of 272.7r / min (twenty-two poles) and a capacity of 300MW has enabled it to be widely used. However, for the twenty-two-pole motor, its stator winding is connected in a conventional symmetrical manner, and the number of optional branches is only 1, 2, 11 and 22. Under the condition of rated voltage of 15.75kV, if 1 branch or 2 branches are selected, the branch current far exceeds the maximum limit of the existing air cooling technology. If 11 branches or 22 branches are selected, the branch current is too low. In the end, the hydraulic performance can only be sacrificed, the motor speed can be adjusted, and the motor speed can be changed; if the unit can use 4 branches, the branch current is equivalent to that of most existing pumped-storage units, so that the hydraulic performance of the unit can be guaranteed, and the motor cost and power station construction cost can be reduced.

[0003] In the prior art, the connection of three-phase double-layer windings can be done by first calculating the number of unit motors and winding cycles, and drawing a star diagram, and then dividing the potential vector of the star diagram into six phase bands. Among them, the six phase bands are represented by A, Z, B, X, C, and Y in sequence, and the potential vector distribution angle of each phase band is 60°. All the potential vectors contained in the six phase bands are synthesized into one potential vector in a series addition manner. The A phase band synthetic vector and the X phase band synthetic vector U, the B phase band synthetic vector and the Y phase band synthetic vector V, the C phase band synthetic vector and the Z phase band synthetic vector W are 180° apart, respectively, and the synthetic vectors of the three phases U, V, and W are 120° apart from each other; then directly draw the stator winding connection diagram or expand the star diagram into a block diagram and then draw the stator winding connection diagram. When drawing the star diagram, the vector corresponding to each slot number in the star diagram is the synthesis of the upper and lower edge potential vectors of the same coil.

[0004] For the stator winding of a 264-slot 22-pole motor, if the number of slots per pole per phase is selected as an integer, according to the existing star diagram drawing method, the star diagram has 11 layers from the inside to the outside, that is, the star diagram has 11 layers of overlapping potential vectors from the inside to the outside, divided into 6 phase bands, each phase contains 22 layers of overlapping potential vectors (11 layers for the positive phase band, 11 layers for the negative phase band, a total of 22 layers), to connect into 4 symmetrical branches, it is necessary to divide these 22 layers of potential vectors into 4 groups, each branch occupies 5.5 layers of overlapping potential vectors, and it is not possible to connect 4 symmetrical branches according to the wiring method of the prior art, that is, the stator winding of the 264-slot 22-pole motor is connected into 4 branches according to the phase band division and wiring method of the prior art, which does not meet the symmetry condition. Similarly, it can be deduced that if the number of slots per pole per phase is selected as a fraction, the symmetry condition is also not met when it is connected into 4 branches according to the phase band division and wiring method of the prior art. The asymmetry of the four branches per phase will inevitably lead to circulating current in the stator winding during actual operation, which will affect the long-term reliable operation of the generator. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a wiring method for a 264-slot, 22-pole symmetrical four-branch double-layer three-phase winding. Through special wiring, a 264-slot, 22-pole symmetrical winding is realized to adapt to the hydraulic speed requirements of the unit and improve the hydraulic performance; it meets the electromagnetic load level of the air-cooled motor and achieves the purpose of reducing the cost of the generator.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] The wiring method of the 264-slot 22-pole symmetrical four-branch double-layer three-phase winding includes the following steps:

[0008] Step S1. The potential vectors of the 528 stator winding bars are taken as separate vectors;

[0009] Step S2. The potential vectors of the 528 wire rods are evenly divided into six phase bands of A, Z, B, X, C, and Y; the potential vectors contained in the two phase bands corresponding to A and X, B and Y, and C and Z are equally divided into four parts; each part is synthesized into a potential vector by serial addition, and each potential vector is a branch, and four branches are obtained, namely the first branch, the second branch, the third branch, and the fourth branch; the four branches are synthesized into a total vector by parallel addition, and each synthesized potential total vector is a phase winding; the four branches of the A and X phase bands constitute the U phase winding, the four branches of the B and Y phase bands constitute the V phase winding, and the four branches of the C and Z phase bands constitute the W phase winding, thereby forming a U, V, and W three-phase double-layer symmetrical four-branch winding;

[0010] The first branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; the second branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the third branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the fourth branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; wherein 1 layer means that the upper and lower wire rods of 1 layer are naturally connected; 0.5 layer means that half of the upper wire rods of 1 layer are taken and half of the lower wire rods are taken.

[0011] When the neutral point is led out, the 1st branch and the 2nd branch are connected in parallel and then led out, and the 3rd branch and the 4th branch are connected in parallel and then led out.

[0012] The three-phase double-layer symmetrical four-branch winding adopts a concentrated winding arrangement, and the four branches are evenly arranged around the circumference.

[0013] The electric potential vectors of the upper and lower edges are plotted in a star diagram. The star diagram has 22 layers of overlapping electric potential vectors from the inside to the outside, and each branch occupies 11 layers of overlapping electric potential vectors.

[0014] When connecting the windings, the A and X, B and Y, C and Z phase bars are connected by "head to head" and "tail to tail" respectively.

[0015] When conducting the connection winding, a full-pitch coil is used, and the winding short-pitch coefficient is 1; and it is naturally connected from the upper layer of wire rods to the lower layer of wire rods.

[0016] When connecting across mechanical angles, open the upper and lower wire rods at the same position at the lower end to increase the oblique parallel connection.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Through this wiring method, the symmetrical wiring of the motor with 22 poles and 4 branches can be achieved, the voltage and slot number selection range is expanded, and the electromagnetic performance of the motor is guaranteed. More specifically, in the present invention, the upper and lower layer wire rods are used as separate vectors. Based on this, a 0.5-layer coil connection method is also adopted. In one branch, half of the upper layer wire rods and half of the lower layer wire rods are taken; the remaining half of the upper and lower layer wire rods belong to another branch. The advantage of this is that the number of series wire rods, the number of upper layer wire rods and the number of lower layer wire rods in each branch are the same between each branch, and the difference in induced potential between branches is minimal.

[0019] 2. When the neutral point is led out, in order to improve the sensitivity of the internal short-circuit fault protection of the unit, the 1st branch and the 2nd branch are connected in parallel and then led out, and the 3rd branch and the 4th branch are connected in parallel and then led out.

[0020] 3. In the present invention, a concentrated winding arrangement is adopted for the structure of the 264-slot 22-pole motor, and the use of a concentrated stator winding arrangement can reduce the swing value of each part of the generator and increase the dynamic stability of the unit.

[0021] 4. The present invention adopts a full-pitch coil, the winding short-pitch coefficient is 1, and a 60° standard phase belt is adopted, so the winding utilization coefficient is high.

[0022] 5. The present invention is applicable to salient pole synchronous motors, and in particular to 272.7 r / min (twenty-two pole) pumped storage generator motors, and can ensure hydraulic performance.

[0023] 6. In the present invention, the A and X, B and Y, C and Z phase bars are connected by "head-to-head connection" and "tail-to-tail connection" respectively, which can ensure that the potential of the bars is added.

[0024] 7. The present invention does not synthesize the potential vectors of the upper side and the lower side of the same coil, but considers the potential vectors of the upper side and the lower side of the same coil separately, and directly draws the potential vectors of the upper side and the lower side in the star diagram. When wiring, the symmetry of each branch of each phase and the symmetry of the three phases can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0026] Figure 1 It is a schematic diagram of the branch symmetrical double-layer winding phase belt and branch division in the present invention;

[0027] Figure 2 It is a block diagram of the connection of four-branch symmetrical double-layer concentrated windings belonging to the U phase in the present invention;

[0028] Figure 3 It is a block diagram of the connection of four-branch symmetrical double-layer concentrated windings belonging to the V phase in the present invention;

[0029] Figure 4 It is a block diagram of the connection of a four-branch symmetrical double-layer concentrated winding belonging to the W phase in the present invention;

[0030] Figure 5 Schematic diagram of the spatial distribution and connection mode of the four parallel branches of phase A on the circumference of the motor in the present invention;

[0031] Figure 6 It is a connection diagram of each branch when the neutral point is led out in the present invention;

[0032] in, Figure 2 , Figure 3 and Figure 4 In the figure, the numbers without apostrophes represent the slot numbers of the upper layer wire rods, and the numbers with apostrophes represent the slot numbers of the lower layer wire rods. DETAILED DESCRIPTION

[0033] Example 1

[0034] As a basic implementation mode of the present invention, the present invention includes a wiring method of a 264-slot, 22-pole, symmetrical, four-branch, double-layer, three-phase winding, including the following steps:

[0035] Step S1. The potential vectors of the 528 stator winding bars are taken as separate vectors.

[0036] Step S2. The potential vectors of the 528 wire rods are evenly divided into six phase bands of A, Z, B, X, C, and Y. The potential vectors contained in the two phase bands corresponding to A and X, B and Y, and C and Z are evenly divided into four parts, and each part is synthesized into a potential vector by adding in series. Each potential vector is a branch, and four branches are obtained, namely the first branch, the second branch, the third branch, and the fourth branch. The four branches are synthesized into a total vector by adding in parallel, and each synthesized potential total vector is a phase winding. The four branches of the A and X phase bands constitute the U phase winding, the four branches of the B and Y phase bands constitute the V phase winding, and the four branches of the C and Z phase bands constitute the W phase winding, thereby forming a U, V, and W three-phase double-layer symmetrical four-branch winding.

[0037] The first branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; the second branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the third branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the fourth branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; wherein, 1 layer means that the upper and lower wire rods of 1 layer are naturally connected; 0.5 layer means that half of the upper wire rods of 1 layer are taken and half of the lower wire rods are taken, but all the wire rods located at the phase belt position must be taken.

[0038] Example 2

[0039] As a preferred embodiment of the present invention, the present invention includes a wiring method for a 264-slot, 22-pole, symmetrical, four-branch, double-layer, three-phase winding, including the following steps:

[0040] Step S1. The potential vectors of the 528 stator winding bars are taken as separate vectors.

[0041] Step S2. The potential vectors of the 528 wire rods are evenly divided into six phase bands, namely, A, Z, B, X, C, and Y. The potential vectors contained in the two phase bands corresponding to A and X, B and Y, and C and Z are evenly divided into four parts, and each part is synthesized into a potential vector by adding in series. Each potential vector is a branch, and four branches are obtained, namely, the first branch, the second branch, the third branch, and the fourth branch. The four branches are synthesized into a total vector by adding in parallel, and each synthesized potential total vector is a phase winding. The synthesized vectors of the A and X phase bands, the B and Y phase bands, and the C and Z phase bands are equal in size, and the total vector of the synthesized vectors of the A phase band and the X phase band is U, the total vector of the synthesized vectors of the B phase band and the Y phase band is V, and the total vector of the synthesized vectors of the C phase band and the Z phase band is W. The vectors of the three phases U, V, and W differ by 120°. A 60° standard phase band is used, and each branch occupies 11 layers of overlapping potential vectors. The four branches of the A and X phase belts constitute the U phase winding, the four branches of the B and Y phase belts constitute the V phase winding, and the four branches of the C and Z phase belts constitute the W phase winding, thus forming a U, V, W three-phase double-layer symmetrical four-branch winding.

[0042] When connecting the winding, the A and X, B and Y, C and Z phase bars are connected by "head-to-head connection" and "tail-to-tail connection" respectively to ensure that the bar potential is added. When connecting, a full-pitch coil is used, and the winding short-pitch coefficient is 1. The connection follows the phase belt and branch division method, and is naturally connected from the upper layer bar to the lower layer bar at a full pitch. If necessary, the upper and lower layers of the bars at the same position at the lower end are opened to increase the oblique parallel connection.

[0043] Among them, the first branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; the second branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the third branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the fourth branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; among them, 1 layer means that the upper and lower wire rods of 1 layer are naturally connected; 0.5 layer means that half of the upper wire rods of 1 layer are taken, and half of the lower wire rods are taken, but all the wire rods located at the phase belt position must be taken.

[0044] Example 3

[0045] As the best embodiment of the present invention, the present invention includes a wiring method for a 264-slot, 22-pole, symmetrical, four-branch, double-layer, three-phase winding, including the following steps:

[0046] Step S1. The potential vectors of the 528 stator winding bars are taken as separate vectors.

[0047] Step S2. The potential vectors of the 528 wire rods are evenly divided into six phase bands of A, Z, B, X, C, and Y. The potential vectors contained in the two phase bands corresponding to A and X, B and Y, and C and Z are evenly divided into four parts, and each part is synthesized into a potential vector by adding in series. Each potential vector is a branch, and four branches are obtained, namely the first branch, the second branch, the third branch, and the fourth branch. The four branches are synthesized into a total vector by adding in parallel, and each synthesized potential total vector is a phase winding.

[0048] The three-phase double-layer symmetrical four-branch winding adopts a concentrated winding arrangement, and the four branches are evenly arranged on the circumference, which reduces the electromagnetic stiffness of the motor and is conducive to the stability of the unit shaft system. The concentrated winding connection makes the four branches of each phase occupy about 1 / 4 of the motor circumference and are arranged in sequence. Figure 5 In order to clearly show the connection relationship of the A-phase belt under each pole, the figure schematically expands the range of the A-phase belt under each pole (close to the entire pole). In fact, each phase belt of the three-phase 60-degree phase belt integer slot winding should occupy 1 / 3 of the pole.

[0049] The A and X, B and Y, C and Z phase wire bars are connected by "head to head connection" and "tail to tail connection" respectively.

[0050] The present invention does not synthesize the potential vectors of the upper and lower sides of the same coil, but considers the potential vectors of the upper and lower sides of the same coil separately, and directly plots the potential vectors of the upper and lower sides in the star diagram. Since the upper and lower wire rods of the same slot are at the same position on the circumference, the direction and size of their induced potential vectors are the same, so the number of potential vectors on each circumference from the inside to the outside of the star diagram is exactly the same as the star diagram of the prior art, except that the number of layers of the circumference has doubled, that is, the number of overlapping potential vectors from the inside to the outside on the star diagram has doubled. In this way, for the stator winding of a 264-slot 22-pole motor, its star diagram has a total of 22 circumference layers from the inside to the outside. Refer to the attached manual Figure 1 , the star diagram containing the upper and lower layer wire rod potential vectors has 22 layers of overlapping potential vectors from the inside to the outside; it is divided into 6 parts, each part is a phase belt, represented by A, Z, B, X, C, and Y. Each phase belt has 22 layers of overlapping potential vectors from the inside to the outside. The numbers without apostrophes in the figure represent the slot number of the upper layer wire rod, and the numbers with apostrophes represent the slot number of the lower layer wire rod. The phase belts A and X differ by 180° to form the U phase, the phase belts B and Y differ by 180° to form the V phase, and the phase belts C and Z differ by 180° to form the W phase. The phase belts A, B, and C differ by 120° to meet the three-phase symmetry. Each two-phase belt is divided into four parts, each part contains 11 layers of overlapping potential vectors, a total of 44 potential vectors, forming a branch. A, Z, B, X, C, and Y each contain 2 branches. The synthetic vectors of the potential vectors contained in the 4 branches of each phase are the same, meeting the branch symmetry.

[0051] The first branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts (5.5 pole phase groups are connected in series); the second branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts (5.5 pole phase groups are connected in series); the third branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts (5.5 pole phase groups are connected in series); the fourth branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts (5.5 pole phase groups are connected in series). 1 layer means that the upper and lower layers of wire rods of 1 layer are naturally connected; 0.5 layers means that half of the upper layer of wire rods of 1 layer are taken, and half of the lower layer of wire rods are taken, but all wire rods located in the phase belt must be taken.

[0052] Refer to the instruction manual Figure 6 When the neutral point is led out, in order to improve the sensitivity of the internal short-circuit fault protection of the unit, the 1st branch and the 2nd branch are led out in parallel, and the 3rd branch and the 4th branch are led out in parallel.

[0053] Use full-pitch coils, and the winding short-pitch coefficient is 1. And connect naturally from the upper layer of wire rods to the lower layer of wire rods. When connecting across the mechanical angle, open the upper and lower layer wire rods at the same position at the lower end to increase the oblique parallel connection.

[0054] The four branches of the A and X phase belts constitute the U phase winding, the four branches of the B and Y phase belts constitute the V phase winding, and the four branches of the C and Z phase belts constitute the W phase winding, thus forming a U, V, W three-phase double-layer symmetrical four-branch winding.

[0055] Refer to the instruction manual Figure 2, connect 20 full-pitch coils 52'-40, 51'-39, 50'-38, 49'-37, 25-37', 26-38', 27-39', 28-40', 28'-16, 27'-15, 26'-14, 25'-13, 1-13', 2-14', 3-15', 4-16', 4'-256, 3'-255, 2'-254, 1'-253 belonging to the U phase and 244, 255', 242, 253' connected by oblique parallel ends and connecting wires in series to form a U1 branch by adding potential; connect 124', 1 11, 122', 109 and 97-109', 98-110', 99-111', 100-112', 100'-88, 99'-87, 98'-86, 97'-85, 73-85', 74-86', 75-87', 76-88', 76'-64, 75'-63, 74'-62, 73'-61, 49-61', 50-62', 51-63', 52-64', a total of 20 full-pitch coils are connected in series to form a U2 branch in the form of potential addition; 121', 110, 123', 112 and 121, which belong to the U phase and are connected by oblique parallel ends and connecting wires -133', 122-134', 123-135', 124-136', 148'-136, 147'-135, 146'-134, 145'-133, 145-157', 146-158', 147-159', 148-160', 172'-160, 171'-159, 170'-158, 169'-157, 169-181', 170-182', 171-183', 172-184', a total of 20 full-pitch coils are connected in series to form a U3 branch in the form of potential addition; 196'-184, 195' belonging to the U phase -183, 194'-182, 193'-181, 193-205', 194-206', 195-207', 196-208', 220'-208, 219'-207, 218'-206, 217'-205, 217-229', 218-230', 219-231', 220-232', 244'-232, 243'-231, 242'-230, 241'-229, a total of 20 full-pitch coils and 241, 254', 243, 256' connected with oblique parallel heads and connecting wires are connected in series to form branch U4 in the form of potential addition.

[0056] A total of four branches, U1, U2, U3, and U4, are connected in parallel to form the U-phase winding.

[0057] Refer to the instruction manual Figure 3, connect 84'-72, 83'-71, 82'-70, 81'-69, 57-69', 58-70', 59-71', 60-72', 60'-48, 59'-47, 58'-46, 57'-45, 33-45', 34-46', 35-47', 36-48', 36'-24, 35'-23, 34'-22, 33'-21, a total of 20 full-pitch coils belonging to the V phase and 12, 23', 10, 21' connected with oblique parallel ends and connecting lines in series to form a V1 branch in the form of potential addition; connect 156', 143, 154', 141 and 129-141', 130-142', 131-143', 132-144', 132'-120, 131'-119, 130'-118, 129'-117, 105-117', 106-118', 107-119', 108-120', 108'-96, 107'-95, 106'-94, 105'-93, 81-95', 82-94', 83-95', 84-96', a total of 20 full-pitch coils are connected in series to form a V2 branch in the form of potential addition; 153', which belongs to the V phase and is connected with an oblique parallel head and a connecting line, 142, 155', 144 and 153-165', 154-166', 155-167', 156-168', 180'-168, 179'-167, 178'-166, 177'-165, 177-189', 178-190', 179-191', 180-192', 204'-192, 203'-191, 202'-190, 201'-189, 201-213', 202-214', 203-215', 204-216', a total of 20 full-pitch coils are connected in series to form a V3 branch in the form of potential addition; the V phase 228'-216, 227'-215, 226'-214, 225'-213, 225-237', 226-238', 227-239', 228-240', 252'-240, 251'-239, 250'-238, 249'-237, 249-261', 250-262', 251-263', 252-264', 12'-264, 11'-263, 10'-262, 9'-261, a total of 20 full-pitch coils and 9, 22', 11, 24' connected with oblique parallel heads and connecting wires are connected in series to form a V4 branch in the form of potential addition.

[0058] A total of four branches, V1, V2, V3, and V4, are connected in parallel to form a V-phase winding.

[0059] Refer to the instruction manual Figure 4, connect the 65', 54, 67', 56 and 65-77', 66-78', 67-79', 68-80', 92'-80, 91'-79, 90'-78, 89'-77, 89-101', 90-102', 91-103', 92-104', 116'-104, 115'-103, 114'-102, 113'-101, 113-125', 114-126', 115-127', 116-128', a total of 20 full-pitch coils belonging to the W phase in series by adding potential to form a W1 branch; connect the W phase 140'-128, 139'-127, 138'-126, 137'-125, 137-149', 138-150', 139-151', 140-152', 164'-152, 163'-151, 162'-150, 161'-149, 161-173', 162-174', 163-175', 164-176', 188'-176, 187'-175, 186'-174, 185'-173, a total of 20 full-pitch coils and 185, 198', 187, 200' connected by oblique parallel heads and connecting wires according to potential The W2 branch is formed by adding them in series; 20 full-pitch coils 260'-248, 259'-247, 258'-246, 257'-245, 233-245', 234-246', 235-247', 236-248', 236'-224, 235'-223, 234'-222, 233'-221, 209-221', 210-222', 211-223', 212-224', 212'-200, 211'-199, 210'-198, 209'-197 belonging to the W phase and 18 8, 199', 186, 197' are connected in series to form branch W3 in the manner of adding potential; 68', 55, 66', 53 and 41-55', 42-54', 43-55', 44-56', 44'-32, 43'-31, 42'-30, 41'-29, 17-29', 18-30', 19-31', 20-32', 20'-8, 19'-7, 18'-6, 17'-5, 257-5', 258-6', 259-7', 260-8', a total of 20 full-pitch coils belonging to phase W are connected in series to form branch W4 in the manner of adding potential.

[0060] A total of 4 branches, W1, W2, W3, and W4, are connected in parallel to form the W-phase winding.

[0061] The U-phase, V-phase and W-phase windings together form a 60° phase-band four-branch symmetrical double-layer winding.

[0062] Through the above wiring method, the present invention is applicable to the stator winding of an AC motor, and is particularly suitable for the stator winding of a salient-pole hydro-turbine generator and a pumped-storage motor.

[0063] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental labor, which all fall within the scope of protection of the present invention.

Claims

1. A wiring method for a 264-slot, 22-pole, symmetrical, four-branch, double-layer, three-phase winding, characterized in that: The following steps are involved: Step S1. The potential vectors of the 528 stator winding bars are taken as separate vectors; Step S2. The potential vectors of the 528 wire rods are evenly divided into six phase bands of A, Z, B, X, C, and Y; the potential vectors contained in the two phase bands corresponding to A and X, B and Y, and C and Z are equally divided into four parts; each part is synthesized into a potential vector by serial addition, and each potential vector is a branch, and four branches are obtained, namely the first branch, the second branch, the third branch, and the fourth branch; the four branches are synthesized into a total vector by parallel addition, and each synthesized potential total vector is a phase winding; the four branches of the A and X phase bands constitute the U phase winding, the four branches of the B and Y phase bands constitute the V phase winding, and the four branches of the C and Z phase bands constitute the W phase winding, thereby forming a U, V, and W three-phase double-layer symmetrical four-branch winding; The first branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; the second branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the third branch includes 3 layers of positive phase belts and 2.5 layers of negative phase belts; the fourth branch includes 2.5 layers of positive phase belts and 3 layers of negative phase belts; wherein 1 layer means that the upper and lower wire rods of 1 layer are naturally connected; 0.5 layer means that half of the upper wire rods of 1 layer are taken and half of the lower wire rods are taken.

2. The wiring method of the 264-slot, 22-pole, symmetrical four-branch, double-layer, three-phase winding according to claim 1 is characterized in that: When the neutral point is led out, the 1st branch and the 2nd branch are connected in parallel and then led out, and the 3rd branch and the 4th branch are connected in parallel and then led out.

3. The wiring method of the 264-slot, 22-pole, symmetrical four-branch, double-layer, three-phase winding according to claim 1 or 2, characterized in that: The three-phase double-layer symmetrical four-branch winding adopts a concentrated winding arrangement, and the four branches are evenly arranged around the circumference.

4. The wiring method of the 264-slot, 22-pole, symmetrical four-branch, double-layer, three-phase winding according to claim 3 is characterized in that: The electric potential vectors of the upper and lower edges are plotted in a star diagram. The star diagram has 22 layers of overlapping electric potential vectors from the inside to the outside, and each branch occupies 11 layers of overlapping electric potential vectors.

5. The wiring method of the 264-slot, 22-pole, symmetrical four-branch, double-layer, three-phase winding according to claim 3 is characterized in that: When connecting the windings, the A and X, B and Y, C and Z phase bars are connected by "head to head" and "tail to tail" respectively.

6. The wiring method of the 264-slot, 22-pole, symmetrical four-branch, double-layer, three-phase winding according to claim 3 is characterized in that: When conducting the connection winding, a full-pitch coil is used, and the winding short-pitch coefficient is 1; and it is naturally connected from the upper layer of wire rods to the lower layer of wire rods.

7. The wiring method of the 264-slot, 22-pole, symmetrical, four-branch, double-layer, three-phase winding according to claim 6, characterized in that: When connecting across mechanical angles, open the upper and lower wire rods at the same position at the lower end to increase the oblique parallel connection.

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