CN-122017683-A - Double-layer winding special wiring verification method and prototype thereof

CN122017683ACN 122017683 ACN122017683 ACN 122017683ACN-122017683-A

Abstract

The invention discloses a special wiring verification method and a prototype thereof for a double-layer winding, belongs to the technical field of three-phase double-layer winding wiring, and is used for the comparative test verification of conventional symmetrical winding wiring and special winding wiring. The method comprises the steps of firstly determining the number of grooves and pole pairs of a true machine, calculating the number of motors of units, selecting an electromagnetic prototype with proper number of motors of the units designed to be consistent with the characteristics of the pole grooves of the true machine, adopting a 0.5-layer coil connection method for the true machine and the prototype, independently considering potential vectors of upper and lower layers of coils, dividing the prototype through phase bands to obtain a plurality of branches, respectively realizing conventional wiring and special wiring through two different serial combination modes of the branches, and completing similarity of the two wiring modes and verification of correctness of wiring theory. The invention realizes the verification of two wiring modes by the same electromagnetic prototype, has effective verification result and low cost, provides test basis for engineering application of special wiring technology, supports the optimization of the number of parallel branches of the stator of the real machine, and improves the overall performance of the motor.

Inventors

ZHU ZHONGYING
ZOU YINGDONG
LIU JIANJUN
LIANG YUQIANG
ZHANG XU
SUN YUAN
DU JIYUE

Assignees

东方电气集团东方电机有限公司

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (9)

1. The special wiring verification method for the double-layer winding is characterized by comprising the following steps of: Step S1, determining the stator slot number Z and the pole pair number P of a true machine, and calculating to obtain the unit motor number t of the true machine, wherein t is the greatest common divisor of the pole pair number P and the slot number Z; s2, selecting the number n of unit motors, wherein n is an integer which is more than or equal to 1 and less than or equal to t, designing an electromagnetic prototype according to the number n of unit motors, so that the electromagnetic prototype and a true prototype meet the same slot characteristics, and the slot numbers of each pole of the true prototype and the electromagnetic prototype are consistent, wherein the pole logarithm of the electromagnetic prototype is nP/t, and the slot number is Z' =nZ/t; s3, setting the number of parallel branches of a stator of a true machine as a number of poles of 2p, wherein a does not meet 2p/a as an integer and meets 4p/a as an integer, the number of parallel branches of a stator of an electromagnetic prototype as a '=a/2, the number of poles of the electromagnetic prototype as 2p', and a 'as an integer and does not meet 2p'/a as an integer; S4, independently considering potential vectors of an upper layer side and a lower layer side of the same coil in the electromagnetic prototype, taking the upper layer coil bar and the lower layer coil bar as independent vectors, adopting a 0.5 layer coil connection method to enable the upper layer coil bar to be half of the upper layer coil bar and the lower layer coil bar to be half of the upper layer coil bar in 1 branch, and enabling the remaining upper layer coil bar and the remaining lower layer coil bar to be half of the lower layer coil bar to belong to the other 1 branch; s5, equally dividing the potential vector of the 2Z' wire rods of the electromagnetic prototype into A, Z, B, X, C, Y six phase bands, equally dividing the potential vectors contained in the two phase bands corresponding to A, X, B, Y, C and Z into a part, and synthesizing each part into a potential vector in a serial addition mode to obtain a branches; and S6, based on the a branches, the three-phase double-layer symmetrical a' branch winding of the electromagnetic prototype is realized by adopting a conventional wiring mode and a special wiring mode respectively, and the similarity of conventional wiring and special wiring of the double-layer winding and the verification of the correctness of wiring theory are completed.
2. The special wiring verification method for the double-layer winding is characterized in that in the step S6, three-phase double-layer symmetrical a ' branch windings of an electromagnetic prototype are realized according to a conventional wiring mode, and the method comprises the steps of adding two branches which are independently connected with upper and lower layer bars in the same slot in the step S4 in series to form 1 composite branch, wherein the a branches are connected in pairs to form a ' branch, the a ' branch of a A, X phase belt forms a U-phase winding, the a ' branch of the B, Y phase belt forms a V-phase winding, and the a ' branch of a C, Z phase belt forms a W-phase winding.
3. The special wiring verification method of the double-layer winding of claim 1, wherein in the step S6, the three-phase double-layer symmetrical a ' branch winding of the electromagnetic prototype is realized according to a special wiring mode, and the method comprises the steps of arranging two branches which are independently connected with upper and lower layer bars in the same slot in the step S4 into different synthesized branches, wherein the a branches are connected in series to obtain a ' branches, the a ' branches of A, X phase belts form U-phase windings, the a ' branches of B, Y phase belts form V-phase windings, and the a ' branches of C, Z phase belts form W-phase windings.
4. The method for verifying special wiring of double-layer windings according to claim 1, wherein in step S2, when the number n of unit motors is selected, the manufacturing cost and the test site factors of the electromagnetic prototype are comprehensively considered, the smaller n is, the higher the rotating speed of the electromagnetic prototype is, the smaller the size is, and the larger n is, the lower the rotating speed of the electromagnetic prototype is, and the larger the size is.
5. The method of verifying a special connection of a double-layer winding according to claim 1, wherein in the step S4, the number of upper layer bars is the same as the number of lower layer bars among the branches, in the series bars to which each branch of the 0.5-layer coil connection belongs.
6. The method of claim 1, wherein in step S6, a' branches of each phase winding are added in parallel to form a total potential vector, and each total potential vector is an independent phase winding.
7. An electromagnetic prototype for realizing the special wiring verification method of the double-layer winding according to any one of claims 1-6, which is characterized in that the prototype and a true machine meet the same corresponding relation of slot number and pole pair number, and the stator winding and the rotor winding are arranged in the same way, wherein the pole pair number of the prototype is nP/t, the slot number is Z' =nZ/t, n is an integer meeting 1-n-t, t is the greatest common divisor of the pole pair number P of the true machine and the slot number Z, and the slot number of each phase of the true machine and each pole of the prototype is kept consistent; the number of parallel branches of the prototype stator is a '=a/2, a is the number of parallel branches of the real stator, the number of prototype poles is 2p', a 'satisfies 2p'/a 'and does not satisfy 2p'/a as an integer; The prototype is provided with 2Z 'bars with independent potential vectors, the bars are divided into A, Z, B, X, C, Y six phase bands on average, and a 0.5-layer coil connection method which independently considers the potential vectors of the upper layer side and the lower layer side of the same coil is supported, so that three-phase double-layer symmetrical a' branch windings in a conventional wiring mode and a special wiring mode can be respectively realized through different serial combinations of branches.
8. The electromagnetic prototype of claim 7, wherein the number of unit motors n of the prototype is less than the number of unit motors t of the true prototype.
9. The electromagnetic prototype of claim 7, wherein a and X, B and Y, C and Z of the electromagnetic prototype correspond to a share of the potential vectors contained by the two phase bands and form a branches, the a branches supporting two different combinations of two in series, matching the branch synthesis requirements of conventional and special wiring, respectively.

Description

Double-layer winding special wiring verification method and prototype thereof Technical Field The invention relates to the technical field of wiring of three-phase double-layer windings, in particular to a special wiring verification method for a double-layer winding and a prototype thereof. Background The pumped storage power station has the functions of peak clipping and valley filling, phase modulation, frequency modulation, emergency and the like, and the matched synchronous generator has the characteristics of frequent start and stop, bidirectional rotation and high rotating speed, and the high-rotating-speed synchronous generator has fewer corresponding magnetic pole numbers. The traditional three-phase double-layer winding wiring requires that the number of parallel branches a of a motor stator be divided by the number of poles 2p, namely 2p/a is an integer. According to a conventional wiring method, the potentials of upper and lower layers of bars are considered as a composite vector, the number of parallel branches of a stator which can be selected by a unit is limited, and the difference between the branches is large, so that the selection of the overall load parameters of the motor is influenced. Taking 300MW class 22 pole pumped storage generators as an example, the number of selectable branches is only 1,2, 11 and 22 when wired in a conventional symmetrical manner. When the rated voltage is 15.75kV, the current of the branch is far higher than the highest limit of the prior air cooling technology when 1 branch or 2 branches are selected, and the current of the branch is too low when 11 branches or 22 branches are selected, so that the hydraulic performance can be finally sacrificed, the motor rotating speed can be adjusted to adapt, and the double loss of the motor performance and the cost is caused. If the unit can adopt 4 branches, the branch current is equivalent to that of most of the existing pumped storage units, so that the hydraulic performance can be ensured, and the construction cost of a motor and a power station can be reduced. In the prior art, the Chinese invention patent with publication number of CN119051318A and publication date of 2024, 11 and 29 discloses a wiring method of two hundred sixty four slots twenty-two pole symmetrical four-branch double-layer three-phase windings. However, the existing method and device for verifying the special wiring mode are not effective, and the similarity between the special wiring mode and the conventional wiring mode and the accuracy of the special wiring theory cannot be accurately verified. According to the alternating current winding theory, the corresponding relation between the number of slots and the pole pair number in the basic unit of the electromagnetic prototype and the true electromagnetic prototype is kept the same, the arrangement modes of stator windings and rotor windings are the same, and the electromagnetic characteristics of the electromagnetic prototype and the true electromagnetic prototype are completely the same, which is a basic criterion for designing the electromagnetic prototype of the alternating current motor. The prior patent also discloses a unit motor selection method of the unconventional winding motor, such as a Chinese invention patent with publication number of CN108959819A and publication date of 2018, 12 and 07, named as a unit motor selection method and device of the unconventional winding motor, the method can provide a unit motor selection scheme for sample trial, but a specific wiring verification method is not proposed, the same electromagnetic sample can not be used for completing the comparison verification of a conventional wiring and a special wiring, and if two samples are independently designed for verification, the research and development cost and the test period can be greatly increased. Disclosure of Invention The invention aims to solve the problems in the prior art, and provides a special wiring verification method for a double-layer winding and a prototype thereof, which are used for realizing the comparison test verification of the conventional wiring and the special wiring of the double-layer winding by using the same electromagnetic prototype, accurately verifying the similarity of two wiring modes and the correctness of a special wiring theory, reducing the verification cost and providing a reliable test basis for the engineering application of a special wiring technology. In order to achieve the above object, the present invention has the following technical scheme: a special wiring verification method for a double-layer winding comprises the following steps: Step S1, determining the stator slot number Z and the pole pair number P of a true machine, and calculating to obtain the unit motor number t of the true machine, wherein t is the greatest common divisor of the pole pair number P and the slot number Z; s2, selecting the number n of unit motors, wherein n is an integer which