Potential calculation method and system for double-layer strip coil motor bar

Abstract

The invention provides a potential calculation method and system for a double-layer bar coil motor bar. The method comprises the following steps: acquiring basic information of the generator double-layer bar coil motor bar and first information of each bar in the generator double-layer bar coil motor; constructing a basic data table according to the basic information of the generator double-layer bar coil motor bar, constructing a bar potential calculation table according to the first information, and indexing the basic data table and the bar potential calculation table; and acquiring first information of a to-be-determined bar, and then determining the potential of the to-be-determined bar based on the first information of the to-be-determined bar, the indexed basic data table and the bar potential calculation table. According to the technical scheme provided by the invention, the ground potential of the motor stator bar and the potential difference between the bars can be automatically and accurately calculated and counted in a single-groove or whole manner, and the analysis efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of large motor stator wire bar potential analysis, and in particular to a potential calculation method and system for a double-layer bar-coil motor wire bar. Background Art

[0002] With the increase of operating years, the surface of the stator bar of the large double-layer bar coil motor has discharge burning marks and even surface insulation material corrosion and powdering due to surface corona and partial discharge of air gaps in the insulation structure, which poses challenges to the safe and stable operation and life of the motor. Therefore, it is necessary to purposefully inspect and count the deterioration phenomenon during maintenance, and comprehensively analyze the cause and formulate a repair strategy based on the deterioration phenomenon and degree of deterioration, the ground potential of the branch where the deterioration part is located, and the potential difference with the adjacent bar. According to the current level of insulation materials, high-voltage insulation theory (in the molded winding bar and coil with a rated voltage higher than about 4kV, partial discharge may occur inside the main insulation, between the surface of the coil or bar, and on the surface of the stator coil) and a large number of practical statistics, the logical relationship between the high potential of the bar and the deterioration due to partial discharge has been reliably verified, so the statistical calculation of the potential of the motor stator bar is particularly important.

[0003] At the same time, with the continuous increase in generator capacity, the number of stator bars of large motors, especially hydro-turbine generators, can reach thousands, and the number of phase branches is large. Taking the stator of a 650MW large hydro-turbine generator as an example, its structure is a double-layer bar coil structure, wave winding connection, 1152 bars, and 8 branches in a single phase. At present, the defect statistics are limited to the physical slot number and level. If key analysis is required, it can only be done by manually comparing the stator wiring diagram slot by slot to locate the branch, branch slot sequence and calculate the potential, which is a huge workload and prone to errors. Because of the difficulty of manual statistical calculation of the bar potential, it also creates a reality that when checking the stator bar, it is impossible to achieve a targeted effect based on the potential data, which is prone to omissions and dependence on the technical skills level and experience of personnel. It is urgent to propose a solution that can automatically and accurately calculate and count the potential of the motor stator bar to the ground and the potential difference between the bars in a single slot or as a whole. Summary of the invention

[0004] The present application provides a potential calculation method and system for a double-layer bar-coil motor bar, so as to at least solve the technical problem that defect statistics are limited to physical slot numbers and levels and the accuracy of manual statistical calculations is low.

[0005] The first embodiment of the present application provides a method for calculating the potential of a double-layer bar-type coil motor bar, the method comprising:

[0006] Obtaining basic information of the generator double-layer bar coil motor bar and first information of each bar in the generator double-layer bar coil motor;

[0007] Constructing a basic data table according to the basic information of the generator double-layer bar coil motor bar, and constructing a bar potential calculation table according to the first information, and then indexing the basic data table and the bar potential calculation table;

[0008] The first information of the wire bar to be determined is obtained, and then the potential of the wire bar to be determined is determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

[0009] Preferably, the basic information includes: number of slots, number of layers, number of branches per phase, pitch, rated voltage, slot sequence, phase, layer and slot number;

[0010] The first information includes: the wire bar slot number, layer, end type and stator winding form, and the tilt direction of the upper end of the upper layer wire bar;

[0011] Wherein, the layers include: an upper layer and a lower layer;

[0012] The ends include: an upper end and a lower end;

[0013] The stator winding types include: wave winding and lap winding;

[0014] The inclination directions of the upper end portion of the upper wire rod include: left and right.

[0015] Furthermore, the basic data table is constructed according to the basic information of the generator double-layer bar coil motor bar, including:

[0016] Determine the number of rods per route according to the number of slots, the number of layers and the number of branches per phase in the basic information;

[0017] Determine the phase voltage according to the rated voltage in the basic information;

[0018] A basic data table is constructed based on the basic information, the number of rods per line and the phase voltage.

[0019] Furthermore, the calculation formula for the number of each route stick is as follows:

[0020]

[0021] In the formula, B1 is the number of slots, B2 is the number of layers, B3 is the number of branches per phase, and B4 is the number of rods per branch;

[0022] The calculation formula of the phase voltage is as follows:

[0023]

[0024] In the formula, B7 is the phase voltage and B6 is the rated voltage.

[0025] Furthermore, constructing a bar potential calculation table according to the first information includes:

[0026] Determine the same-layer adjacent phase information and different-layer crossing information of each of the wire bars based on the pitch in the basic information and the first information;

[0027] Determine the ground potential of each of the wire bars, the potential difference between adjacent wire bars on the same layer, and the potential difference between crossed wire bars on different layers according to the first information, the adjacent phase information on the same layer of each of the wire bars, and the crossing information on different layers;

[0028] Constructing the bar potential calculation table based on the first information, the adjacent phase information of the bars on the same layer, the crossing information of the bars on different layers, the ground potential of the bars, the potential difference between the adjacent bars on the same layer, and the potential difference between the crossing bars on different layers;

[0029] The ground potential of each wire bar includes: the ground potential of the wire bar high potential end, the ground potential of the wire bar low potential end and the ground potential of the inner point of the wire bar core segment;

[0030] The potential difference between adjacent wire bars on the same layer includes: the potential difference between wire bars at the same height on the same layer and the potential difference between wire bars at the same height on the same layer and different phases;

[0031] The potential difference of cross-wire bars in different layers includes: the potential difference of the same-height points of the same-phase wire bars in different layers and the potential difference of the same-height points of the different-phase wire bars in different layers.

[0032] Furthermore, the calculation formula of the potential of the high potential end of the wire rod to the ground is as follows:

[0033] U′ 高 =(Z 分支 +1-A)×U 平均

[0034] In the formula, U′ 高 Z is the potential of the high potential end of the wire rod to the ground, 分支 is the number of wire rods in the branch where the wire rod is located, A is the slot sequence in the branch where the wire rod is located, U 平均 is the average gradient potential of the wire rod, U 平均 =U 0 / Z 分支 , U 0 is the phase voltage;

[0035] The calculation formula of the low potential end of the wire rod to the ground potential is as follows:

[0036] U′ 低 =(Z 分支 -A)×U 平均

[0037] In the formula, U′ 低 The potential of the low potential end of the wire rod to the ground;

[0038] The calculation formula for the ground potential of the points in the wire rod core segment is as follows:

[0039] U″=U′ 低 +U 平均 ×LA / L

[0040] Where U″ is the ground potential of the inner point of the wire rod core segment, LA is the distance from the inner point of the wire rod to the slot at the low potential end, and L is the total length of the core slot;

[0041] The calculation formula of the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height is as follows:

[0042] U 同 =|U 同1 -U 同2 ∣

[0043] Where U 同 is the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height, U 同1 is the potential of the same-phase bar 1, U 同2 is the potential of the same-phase bar 2, where bar 1 is adjacent to bar 2;

[0044] The calculation formula of the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height is as follows:

[0045]

[0046] Where U 异 is the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height, U 异1 is the potential of the out-of-phase bar 1, U 异2 is the potential of the out-of-phase bar 2.

[0047] Furthermore, the determining the potential of the to-be-determined wire bar based on the first information of the to-be-determined wire bar, the indexed basic data table and the wire bar potential calculation table includes:

[0048] According to the first information of the wire bar to be determined, the basic data table after the index and the wire bar potential calculation search for the potential information corresponding to the first information of the wire bar to be determined;

[0049] Using the potential information as the potential of the wire bar to be determined;

[0050] The potential information includes: ground potential and potential difference.

[0051] The second embodiment of the present application provides a potential calculation system for a double-layer bar-type coil motor bar, comprising:

[0052] An acquisition module, used to acquire basic information of a wire rod of a double-layer bar coil motor of a generator and first information of each wire rod in the double-layer bar coil motor of the generator;

[0053] A construction module, used to construct a basic data table according to the basic information of the generator double-layer bar coil motor bar, and to construct a bar potential calculation table according to the first information, and then index the basic data table and the bar potential calculation table;

[0054] The determination module is used to obtain first information of the wire bar to be determined, and then determine the potential of the wire bar to be determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

[0055] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in the first aspect is implemented.

[0056] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect of the present application.

[0057] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0058] The present application proposes a method and system for calculating the potential of a double-layer bar-coil motor bar, the method comprising: obtaining basic information of the generator double-layer bar-coil motor bar and first information of each bar in the generator double-layer bar-coil motor; constructing a basic data table based on the basic information of the generator double-layer bar-coil motor bar, and constructing a bar potential calculation table based on the first information, and then indexing the basic data table and the bar potential calculation table; obtaining the first information of the bar to be determined, and then determining the potential of the bar to be determined based on the first information of the bar to be determined, the indexed basic data table and the bar potential calculation table. The technical solution proposed in the present application can automatically and accurately calculate and count the potential of the motor stator bar to the ground and the potential difference between the bars in a single slot or as a whole, greatly improving the analysis efficiency.

[0059] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0061] Figure 1 A flowchart of a method for calculating the potential of a double-layer bar-coil motor bar provided according to an embodiment of the present application;

[0062] Figure 2 The present invention is a structural diagram of a potential calculation system for a double-layer bar-coil motor bar provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0063] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0064] The present application proposes a method and system for calculating the potential of a double-layer bar-coil motor bar, the method comprising: obtaining basic information of the generator double-layer bar-coil motor bar and first information of each bar in the generator double-layer bar-coil motor; constructing a basic data table based on the basic information of the generator double-layer bar-coil motor bar, and constructing a bar potential calculation table based on the first information, and then indexing the basic data table and the bar potential calculation table; obtaining the first information of the bar to be determined, and then determining the potential of the bar to be determined based on the first information of the bar to be determined, the indexed basic data table and the bar potential calculation table. The technical solution proposed in the present application can automatically and accurately calculate and count the potential of the motor stator bar to the ground and the potential difference between the bars in a single slot or as a whole, greatly improving the analysis efficiency.

[0065] The following describes a method and system for calculating the potential of a double-layer bar-coil motor bar according to an embodiment of the present application with reference to the accompanying drawings.

[0066] Embodiment 1

[0067] Figure 1 Flow chart of a method for calculating the potential of a double-layer bar coil motor bar according to one embodiment of the present application, as shown in FIG. Figure 1 As shown, the method includes:

[0068] Step 1: Obtain basic information of the generator double-layer bar coil motor bar and first information of each bar in the generator double-layer bar coil motor.

[0069] It should be noted that the basic information includes: number of slots, number of layers, number of branches per phase, pitch, rated voltage, slot sequence, phase, layer and slot number;

[0070] The first information includes: the wire bar slot number, layer, end type and stator winding form, and the tilt direction of the upper end of the upper layer wire bar;

[0071] Wherein, the layers include: an upper layer and a lower layer;

[0072] The ends include: an upper end and a lower end;

[0073] The stator winding types include: wave winding and lap winding;

[0074] The inclination directions of the upper end portion of the upper wire rod include: left and right.

[0075] It should be noted that the iron core is the center of the motor stator, that is, the wire rods close to the center are the upper wire rods, and the wire rods close to the center are the lower wire rods.

[0076] Step 2: construct a basic data table according to the basic information of the generator double-layer bar coil motor bar, and construct a bar potential calculation table according to the first information, and then index the basic data table and the bar potential calculation table.

[0077] In the embodiment of the present disclosure, the basic data table is constructed according to the basic information of the double-layer bar-type coil motor bar of the generator, including:

[0078] Determine the number of rods per route according to the number of slots, the number of layers and the number of branches per phase in the basic information;

[0079] Determine the phase voltage according to the rated voltage in the basic information;

[0080] A basic data table is constructed based on the basic information, the number of rods per line and the phase voltage.

[0081] Furthermore, the calculation formula for the number of each route stick is as follows:

[0082]

[0083] In the formula, B1 is the number of slots, B2 is the number of layers, B3 is the number of branches per phase, and B4 is the number of rods per branch;

[0084] The calculation formula of the phase voltage is as follows:

[0085]

[0086] In the formula, B7 is the phase voltage and B6 is the rated voltage.

[0087] In the embodiment of the present disclosure, constructing a bar potential calculation table according to the first information includes:

[0088] Determine the same-layer adjacent phase information and different-layer crossing information of each of the wire bars based on the pitch in the basic information and the first information;

[0089] Determine the ground potential of each of the wire bars, the potential difference between adjacent wire bars on the same layer, and the potential difference between crossed wire bars on different layers according to the first information, the adjacent phase information on the same layer of each of the wire bars, and the crossing information on different layers;

[0090] Constructing the bar potential calculation table based on the first information, the adjacent phase information of the bars on the same layer, the crossing information of the bars on different layers, the ground potential of the bars, the potential difference between the adjacent bars on the same layer, and the potential difference between the crossing bars on different layers;

[0091] The ground potential of each wire bar includes: the ground potential of the wire bar high potential end, the ground potential of the wire bar low potential end and the ground potential of the inner point of the wire bar core segment;

[0092] The potential difference between adjacent wire bars on the same layer includes: the potential difference between wire bars at the same height on the same layer and the potential difference between wire bars at the same height on the same layer and different phases;

[0093] The potential difference of cross-wire bars in different layers includes: the potential difference of the same-height points of the same-phase wire bars in different layers and the potential difference of the same-height points of the different-phase wire bars in different layers.

[0094] Furthermore, the calculation formula of the potential of the high potential end of the wire rod to the ground is as follows:

[0095] U′ 高 =(Z 分支 +1-A)×U 平均 ----(1)

[0096] In the formula, U′ 高 Z is the potential of the high potential end of the wire rod to the ground, 分支 is the number of wire rods in the branch where the wire rod is located, A is the slot sequence in the branch where the wire rod is located, U 平均 is the average gradient potential of the wire rod, U 平均 =U 0 / Z 分支 , U 0 is the phase voltage;

[0097] The calculation formula of the low potential end of the wire rod to the ground potential is as follows:

[0098] U′ 低 =(Z 分支 -A)×U 平均 ----(2)

[0099] In the formula, U′ 低 The potential of the low potential end of the wire rod to the ground;

[0100] The calculation formula for the ground potential of the points in the wire rod core segment is as follows:

[0101] U″=U′ 低 +U 平均 ×LA / L----(3)

[0102] Where U″ is the ground potential of the inner point of the wire rod core segment, LA is the distance from the inner point of the wire rod to the slot at the low potential end, and L is the total length of the core slot;

[0103] The calculation formula of the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height is as follows:

[0104] U 同 =|U 同1 -U 同2 ∣----(4)

[0105] Where U 同 is the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height, U 同1 is the potential of the same-phase bar 1, U 同2 is the potential of the same-phase bar 2, where bar 1 is adjacent to bar 2;

[0106] The calculation formula of the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height is as follows:

[0107]

[0108] Where U 异 is the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height, U 异1 is the potential of the out-of-phase bar 1, U 异2 is the potential of the out-of-phase bar 2.

[0109] It should be noted that the phase difference between the out-of-phases can be 120°.

[0110] In the disclosed embodiment, the basic data table and the wire rod potential calculation table may be XLSX worksheets.

[0111] For example, 1). The basic data table may be as shown in Table 1:

[0112] Table 1

[0113]

[0114]

[0115] Among them, the number of slots is the total number of slots, the number of layers can be 2 layers, the number of branches per phase can be 8 branches per phase, the rated voltage can be 18kV, and the pitch can be 1, 11, or 25.

[0116] 2). Number of sticks per route (B4):

[0117] If the number of slots (B1), the number of layers (B2), and the number of branches per phase (B3) are not empty, the calculation is performed according to the following formula:

[0118]

[0119] Phase voltage (B7):

[0120] If the rated voltage (B6) is not empty, the calculation formula is:

[0121]

[0122] Slot sequence (B8 and subsequent columns):

[0123] Start from 1 and increase until it equals the number of rods per route (B4). For example, if B4 = 48, the slot sequence is 1, 2, ..., 48.

[0124] 3). Fill in the phase, layer and slot number of each branch of the stator winding of any phase generator, such as the 10th and 11th rows in Table 1;

[0125] 4). If the physical structure of the generator stator winding is symmetrical in different phases, then the other two phases of the branches that are symmetrical to the branches with the phase difference, level and slot number filled in above only need to fill in the phase difference and the slot number of the first wire rod of the branch, and the slot numbers of the wire rods in other branches are automatically calculated according to the mathematical deviation law between the slot numbers of the wire rods in the symmetrical branch chain. If the physical structure of the generator stator winding is asymmetrical in different phases, fill in the phase difference, level and slot number of all branches.

[0126] If the branch represented by the row where B34 and B35 are located is symmetrical to the branch represented by the row where B10 and B11 are located, the table data in the row and column where B10 is located will be automatically associated from the row B34 onwards;

[0127] After filling in the branch head end wire rod slot number in B35, C35 and subsequent rows of the table are automatically calculated according to the mathematical difference rule between the branch slot numbers in the row where B11 is located. For example, C11-B11=a, D11-C11=b, then C35=B35+a, D35=C35+b, and so on, until the end wire rod of the branch.

[0128] 5). Based on the above completed information, index information is automatically generated in the basic information table for cross-reference in subsequent potential calculation tables.

[0129] A82 and the tables after the same column automatically associate branch phases and branch numbers, such as "A1" for phase A branch 1;

[0130] After B82, the table automatically generates index information in the format of "level + slot number" according to the level and slot number of each branch line bar, such as "upper 102" means the 102th slot on the upper level.

[0131] For example, the bar potential calculation table is shown in Table 2:

[0132] Table 2

[0133]

[0134] Establish the parameter definition and data presentation structure table "Line Bar Potential Calculation Table" as shown in Table 2.

[0135] Among them, the second row of the Q, R, and S columns automatically generates the definition names of different layers "cross X phase", "X-potential", and "AX potential difference" according to the pitch parameters of "Table 1", where X starts from 1 and goes to the maximum span difference within the stator winding pitch -1.

[0136] Fill in A, B, C, D, and E with the information such as the slot number, layer (upper / lower), terminal (upper / lower), winding type (wave winding / lap winding), and inclination direction of the upper layer wire bar (left / right) to be calculated.

[0137] Automatically calculate the wire rod slot number and related position information and index the relevant information in the "Basic Information Table" for calculation.

[0138] Step 3: Acquire the first information of the wire bar to be determined, and then determine the potential of the wire bar to be determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

[0139] In an embodiment of the present disclosure, determining the potential of the to-be-determined wire bar based on the first information of the to-be-determined wire bar, the indexed basic data table, and the wire bar potential calculation table includes:

[0140] According to the first information of the wire bar to be determined, the basic data table after the index and the wire bar potential calculation search for the potential information corresponding to the first information of the wire bar to be determined;

[0141] Using the potential information as the potential of the wire bar to be determined;

[0142] The potential information includes: ground potential and potential difference.

[0143] It should be noted that the potential calculation includes:

[0144] Wire rod positioning: Determine the phase, branch number and slot sequence of the wire rod by matching the index information in the basic information table with the slot number and level. For example, "A6-43" means the 43rd wire rod of the 6th branch of phase A.

[0145] Calculation of the line bar potential to ground: Combined with the end type (upper / lower) and line bar location information (such as "upper 1 / A6-43", the 43rd line bar of the 1st slot of the upper layer / the 6th branch of phase A), first determine whether the end potential belongs to the high potential end or the low potential end of the line bar, and then automatically calculate the line bar potential to ground according to formula (1) or formula (2).

[0146] Calculation of potential difference between adjacent bars on the same floor:

[0147] (1) Determine the adjacent bar slot number by slot number ±1;

[0148] (2) Positioning adjacent wire rods and calculating their potential according to the aforementioned wire rod positioning and ground potential calculation methods;

[0149] (3) When adjacent wire bars are in phase, the potential difference is calculated according to formula (4); when adjacent wire bars are out of phase, the potential difference is calculated according to formula (5).

[0150] Calculation of potential difference between cross-wires in different layers:

[0151] (1) Comprehensively consider the crossing order of the different-layer wire bars and the calculated wire bars (i.e., the number of "X" in "crossing X phase"), the calculated wire bar positioning information, the winding pitch, the winding type (wave winding / lap winding), the end type (upper / lower), and other data, and confirm the slot number of the different-layer wire bars according to the calculated wire bar slot number ±X;

[0152] (2) Combined with the level and slot number of the different-layer wire rods, the potential of the different-layer wire rods is calculated according to the above-mentioned wire rod positioning and ground potential calculation method;

[0153] When the wire rods on different layers are in phase, the potential difference is calculated according to formula (4); when the wire rods on different layers are out of phase, the potential difference is calculated according to formula (5).

[0154] As an example, the calculation of the stator winding bar potential of a 650MW generator in a certain factory is used for demonstration. After the basic database is established and the basic data is entered, the "Basic Data Table" is shown in Table 3:

[0155]

[0156]

[0157] After the "Basic Data Table" is established, the slot number, layer (upper or lower), end type (upper or lower), stator winding form (wave winding or butterfly winding), and inclination direction of the upper end of the upper layer wire bar to be analyzed are selected and filled in to automatically generate Table 4 data, where Table 4 is as follows:

[0158] Table 4

[0159]

[0160] From the above, it can be seen that the potential calculation method of the double-layer bar coil motor bar proposed in this embodiment has the following advantages. It can automatically calculate and count the potential of the motor stator bar and the potential difference between the bars in a single slot or as a whole, which greatly improves the analysis efficiency. The overall data statistics can display the potential distribution of the stator winding, which has a targeted auxiliary role in motor stator maintenance, fault analysis, etc.

[0161] In summary, the potential calculation method of the double-layer bar-coil motor bar proposed in this embodiment can automatically and accurately calculate and count the potential of the motor stator bar to the ground and the potential difference between the bars in a single slot or as a whole, greatly improving the analysis efficiency.

[0162] Embodiment 2

[0163] Figure 2 FIG. 1 is a structural diagram of a potential calculation system for a double-layer bar-coil motor bar according to an embodiment of the present application. Figure 2 As shown, the system comprises:

[0164] An acquisition module 100 is used to acquire basic information of a wire rod of a double-layer bar coil motor of a generator and first information of each wire rod in the double-layer bar coil motor of the generator;

[0165] The basic information includes: number of slots, number of layers, number of branches per phase, pitch, rated voltage, slot sequence, phase, layer and slot number;

[0166] The first information includes: the wire bar slot number, layer, end type and stator winding form, and the tilt direction of the upper end of the upper layer wire bar;

[0167] Wherein, the layers include: an upper layer and a lower layer;

[0168] The ends include: an upper end and a lower end;

[0169] The stator winding types include: wave winding and lap winding;

[0170] The inclination directions of the upper end portion of the upper wire rod include: left and right.

[0171] A construction module 200 is used to construct a basic data table according to the basic information of the generator double-layer bar coil motor bar, and to construct a bar potential calculation table according to the first information, and then index the basic data table and the bar potential calculation table;

[0172] The determination module 300 is used to obtain first information of the wire bar to be determined, and then determine the potential of the wire bar to be determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

[0173] In the embodiment of the present disclosure, the building module 200 is also used for:

[0174] Determine the number of rods per route according to the number of slots, the number of layers and the number of branches per phase in the basic information;

[0175] Determine the phase voltage according to the rated voltage in the basic information;

[0176] A basic data table is constructed based on the basic information, the number of rods per line and the phase voltage.

[0177] The calculation formula for the number of each route stick is as follows:

[0178]

[0179] In the formula, B1 is the number of slots, B2 is the number of layers, B3 is the number of branches per phase, and B4 is the number of rods per branch;

[0180] The calculation formula of the phase voltage is as follows:

[0181]

[0182] In the formula, B7 is the phase voltage and B6 is the rated voltage.

[0183] Furthermore, the building module 200 is also used for:

[0184] Determine the same-layer adjacent phase information and different-layer crossing information of each of the wire bars based on the pitch in the basic information and the first information;

[0185] Determine the ground potential of each of the wire bars, the potential difference between adjacent wire bars on the same layer, and the potential difference between crossed wire bars on different layers according to the first information, the adjacent phase information on the same layer of each of the wire bars, and the crossing information on different layers;

[0186] Constructing the bar potential calculation table based on the first information, the adjacent phase information of the bars on the same layer, the crossing information of the bars on different layers, the ground potential of the bars, the potential difference between the adjacent bars on the same layer, and the potential difference between the crossing bars on different layers;

[0187] The ground potential of each wire bar includes: the ground potential of the wire bar high potential end, the ground potential of the wire bar low potential end and the ground potential of the inner point of the wire bar core segment;

[0188] The potential difference between adjacent wire bars on the same layer includes: the potential difference between wire bars at the same height on the same layer and the potential difference between wire bars at the same height on the same layer and different phases;

[0189] The potential difference of cross-wire bars in different layers includes: the potential difference of the same-height points of the same-phase wire bars in different layers and the potential difference of the same-height points of the different-phase wire bars in different layers.

[0190] The calculation formula of the high potential end of the wire rod to the ground potential is as follows:

[0191] U′ 高 =(Z 分支 +1-A)×U 平均

[0192] In the formula, U′ 高 Z is the potential of the high potential end of the wire rod to the ground, 分支 is the number of wire rods in the branch where the wire rod is located, A is the slot sequence in the branch where the wire rod is located, U 平均 is the average gradient potential of the wire rod, U 平均 =U 0 / Z 分支 , U 0 is the phase voltage;

[0193] The calculation formula of the low potential end of the wire rod to the ground potential is as follows:

[0194] U′ 低 =(Z 分支 -A)×U 平均

[0195] In the formula, U′ 低 The potential of the low potential end of the wire rod to the ground;

[0196] The calculation formula for the ground potential of the points in the wire rod core segment is as follows:

[0197] U″=U′ 低 +U 平均 ×LA / L

[0198] Where U″ is the ground potential of the inner point of the wire rod core segment, LA is the distance from the inner point of the wire rod to the slot at the low potential end, and L is the total length of the core slot;

[0199] The calculation formula of the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height is as follows:

[0200] U 同 =|U 同1 -U 同2 ∣

[0201] Where U 同 is the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height, U 同1 is the potential of the same-phase bar 1, U 同2 is the potential of the same-phase bar 2, where bar 1 is adjacent to bar 2;

[0202] The calculation formula of the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height is as follows:

[0203]

[0204] Where U异 is the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height, U 异1 is the potential of the out-of-phase bar 1, U 异2 is the potential of the out-of-phase bar 2.

[0205] In the embodiment of the present disclosure, the determination module 300 is further used to:

[0206] According to the first information of the wire bar to be determined, the basic data table after the index and the wire bar potential calculation search for the potential information corresponding to the first information of the wire bar to be determined;

[0207] Using the potential information as the potential of the wire bar to be determined;

[0208] The potential information includes: ground potential and potential difference.

[0209] In summary, the potential calculation system for the double-layer bar-coil motor bar proposed in this embodiment can automatically and accurately calculate and count the potential of the motor stator bar to the ground and the potential difference between the bars in a single slot or as a whole, greatly improving the analysis efficiency.

[0210] Embodiment 3

[0211] In order to implement the above embodiments, the present disclosure further proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in Embodiment 1 is implemented.

[0212] Embodiment 4

[0213] In order to implement the above embodiments, the present disclosure further proposes a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in the first embodiment is implemented.

[0214] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0215] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0216] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for calculating the potential of a double-layer bar coil motor bar, characterized in that: The method comprises: Obtaining basic information of the generator double-layer bar coil motor bar and first information of each bar in the generator double-layer bar coil motor; Constructing a basic data table according to the basic information of the generator double-layer bar coil motor bar, and constructing a bar potential calculation table according to the first information, and then indexing the basic data table and the bar potential calculation table; The first information of the wire bar to be determined is obtained, and then the potential of the wire bar to be determined is determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

2. The method according to claim 1, characterized in that The basic information includes: number of slots, number of layers, number of branches per phase, pitch, rated voltage, slot sequence, phase, layer and slot number; The first information includes: the wire bar slot number, layer, end type and stator winding form, and the tilt direction of the upper end of the upper layer wire bar; Wherein, the layers include: an upper layer and a lower layer; The ends include: an upper end and a lower end; The stator winding types include: wave winding and lap winding; The inclination directions of the upper end portion of the upper wire rod include: left and right.

3. The method according to claim 2, characterized in that The basic data table is constructed according to the basic information of the generator double-layer bar coil motor bar, including: Determine the number of rods per route according to the number of slots, the number of layers and the number of branches per phase in the basic information; Determine the phase voltage according to the rated voltage in the basic information; A basic data table is constructed based on the basic information, the number of rods per line and the phase voltage.

4. The method according to claim 3, characterized in that The calculation formula for the number of each route stick is as follows: In the formula, B1 is the number of slots, B2 is the number of layers, B3 is the number of branches per phase, and B4 is the number of rods per branch; The calculation formula of the phase voltage is as follows: In the formula, B7 is the phase voltage and B6 is the rated voltage.

5. The method according to claim 4, characterized in that The constructing a bar potential calculation table according to the first information includes: Determine the same-layer adjacent phase information and different-layer crossing information of each of the wire bars based on the pitch in the basic information and the first information; Determine the ground potential of each of the wire bars, the potential difference between adjacent wire bars on the same layer, and the potential difference between crossed wire bars on different layers according to the first information, the adjacent phase information on the same layer of each of the wire bars, and the crossing information on different layers; Constructing the bar potential calculation table based on the first information, the adjacent phase information of the bars on the same layer, the crossing information of the bars on different layers, the ground potential of the bars, the potential difference between the adjacent bars on the same layer, and the potential difference between the crossing bars on different layers; The ground potential of each wire bar includes: the ground potential of the wire bar high potential end, the ground potential of the wire bar low potential end and the ground potential of the inner point of the wire bar core segment; The potential difference between adjacent wire bars on the same layer includes: the potential difference between wire bars at the same height on the same layer and the potential difference between wire bars at the same height on the same layer and different phases; The potential difference of cross-wire bars in different layers includes: the potential difference of the same-height points of the same-phase wire bars in different layers and the potential difference of the same-height points of the different-phase wire bars in different layers.

6. The method according to claim 5, characterized in that The calculation formula of the high potential end of the wire rod to the ground potential is as follows: U′ 高 =(Z 分支 +1-A)×U 平均 In the formula, U′ 高 Z is the potential of the high potential end of the wire rod to the ground, 分支 is the number of wire rods in the branch where the wire rod is located, A is the slot sequence in the branch where the wire rod is located, U 平均 is the average gradient potential of the wire rod, U 平均 =U0 / Z 分支 , U0 is the phase voltage; The calculation formula of the low potential end of the wire rod to the ground potential is as follows: U′ 低 =(Z 分支 -A)×U 平均 In the formula, U′ 低 The potential of the low potential end of the wire rod to the ground; The calculation formula for the ground potential of the points in the wire rod core segment is as follows: U″=U′ 低 +U 平均 ×LA / L Where U″ is the ground potential of the inner point of the wire rod core segment, LA is the distance from the inner point of the wire rod to the slot at the low potential end, and L is the total length of the core slot; The calculation formula of the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height is as follows: IN 同 =∣U 同1 -IN 同2 ∣ Where U 同 is the potential difference of the same-layer and same-phase wire rod at the same height or the potential difference of the same-layer and same-phase wire rod at the same height, U 同1 is the potential of the same-phase bar 1, U 同2 is the potential of the same-phase bar 2, where bar 1 is adjacent to bar 2; The calculation formula of the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height is as follows: Where U 异 is the potential difference of the same-layer and different-phase wire rods at the same height or the potential difference of the same-layer and different-phase wire rods at the same height, U 异1 is the potential of the out-of-phase bar 1, U 异2 is the potential of the out-of-phase bar 2.

7. The method according to claim 6, characterized in that The determining the potential of the to-be-determined wire bar based on the first information of the to-be-determined wire bar, the indexed basic data table and the wire bar potential calculation table comprises: According to the first information of the wire bar to be determined, the basic data table after the index and the wire bar potential calculation search for the potential information corresponding to the first information of the wire bar to be determined; Using the potential information as the potential of the wire bar to be determined; The potential information includes: ground potential and potential difference.

8. A potential calculation system for a double-layer bar coil motor bar, characterized in that: The system comprises: An acquisition module, used to acquire basic information of a wire rod of a double-layer bar coil motor of a generator and first information of each wire rod in the double-layer bar coil motor of the generator; A construction module, used to construct a basic data table according to the basic information of the generator double-layer bar coil motor bar, and to construct a bar potential calculation table according to the first information, and then index the basic data table and the bar potential calculation table; The determination module is used to obtain first information of the wire bar to be determined, and then determine the potential of the wire bar to be determined based on the first information of the wire bar to be determined, the indexed basic data table and the wire bar potential calculation table.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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