CN110715977A - Method for obtaining performance degradation index of non-oriented electrical steel after blanking - Google Patents
Method for obtaining performance degradation index of non-oriented electrical steel after blanking Download PDFInfo
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Abstract
The embodiment of the invention provides a method for acquiring performance degradation indexes of non-oriented electrical steel after blanking, which comprises the following steps: acquiring the length of a shearing surface corresponding to each electrical steel in more than two electrical steels; respectively forming corresponding Epstein square ring samples by each electrical steel; carrying out iron loss test on each Epstein square ring sample by using an Epstein square ring tester to respectively obtain an iron loss value and a magnetic induction intensity index of the electrical steel corresponding to each Epstein square ring; and fitting the magnetic induction intensity indexes with the length of the shearing surface respectively according to the iron loss value to obtain the performance degradation rate of the electrical steel after shearing so as to guide the design of the motor iron core. The invention solves the problems of redesign and excessive design quality in the current iron core design.
Description
Technical Field
The invention relates to the technical field of electromagnetism, in particular to a method for acquiring performance degradation indexes of non-oriented electrical steel after blanking.
Background
In the production process of the iron core, the processes of shearing and blanking cold-rolled electrical steel plates into stator and rotor sheets and EI sheets are involved. In the process of shearing and blanking, the deformation area of the edge of the steel sheet directly influences the electromagnetic performance of the steel sheet, and further influences the overall performance index of the iron core.
At present, the iron core loss is usually designed by actually measuring the iron core loss after trial-making or estimating according to experience. Although the trial iron core actual measurement method is accurate, once the test is unqualified, the design needs to be modified and the iron core needs to be remanufactured, so that the time cost and the manufacturing cost are high. The method for estimating the iron loss of the iron core according to experience has the defects that the judgment on the iron loss is not accurate enough, a larger insurance value is usually selected to prevent errors, and certain design quality excess occurs in the design stage. Therefore, there is an urgent need for a method for estimating the electromagnetic performance of the iron core that can avoid redesign and excessive design quality.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method for obtaining performance degradation indexes of non-oriented electrical steel after blanking, which solves the problems of redesign and excessive design quality in the current iron core design.
The application provides the following technical scheme through an embodiment:
a method for obtaining performance degradation indexes of non-oriented electrical steel after blanking comprises the following steps:
acquiring the length of a shearing surface corresponding to each electrical steel in more than two electrical steels; respectively forming corresponding Epstein square ring samples by each electrical steel; performing iron loss test on each Epstein square ring sample by adopting an Epstein square ring tester, and respectively obtaining an iron loss value and a magnetic induction intensity index of the electrical steel corresponding to each Epstein square ring; and fitting the magnetic induction intensity indexes with the length of the shearing surface respectively according to the iron loss value to obtain the performance degradation rate of the electrical steel after shearing so as to guide the design of the motor iron core.
Preferably, the obtaining the performance degradation rate of the electrical steel after shearing according to the fitting of the iron loss value and the magnetic induction strength index with the length of the shearing surface respectively for guiding the design of the motor iron core includes:
fitting according to the iron loss value and the length of the shearing surface to obtain the performance degradation rate of the iron core loss after the electrical steel is sheared; the performance degradation rate of the iron core loss is a degradation rate caused by the iron loss of the electrical steel; fitting according to the magnetic induction intensity index and the length of the shearing surface to obtain the performance degradation rate of the magnetic induction intensity of the electrical steel after shearing; the performance degradation rate of the magnetic induction strength is the degradation rate corresponding to the magnetic induction of the electrical steel; and guiding and designing the motor iron core based on the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength.
Preferably, the guidance design of the motor core based on the performance degradation rate of the core loss and the performance degradation rate of the magnetic induction strength includes:
obtaining the weight of an iron core of a target iron core to be designed; obtaining an electromagnetic performance value of the target iron core according to the shearing surface length, the iron core weight, the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength; wherein the electromagnetic performance values are used to guide the design of the motor core.
Preferably, the obtaining an electromagnetic performance value of the target core from the shear plane length, the core weight, the performance degradation rate of the core loss, and the performance degradation rate of the strength of magnetic induction includes:
obtaining the performance degradation rate of the iron core loss of the target iron core according to the weight of the iron core; based on P ═ P1+kpL, obtaining the iron core loss of the target iron core; based on B ═ B1-kbL, obtaining the magnetic induction intensity of the target iron core; representing the electromagnetic property value of the target iron core by adopting the iron core loss of the target iron core and the magnetic induction strength of the target iron core; wherein P is the core loss of the target core, P1To theoretical core loss, KpThe rate of deterioration of the core loss of the target core, B is the strength of induction, B is1As the theoretical strength of induction, KbL is the shear plane length of the target core, which is the rate of deterioration of the magnetic strength.
Preferably, the electrical steels with different shearing surface lengths are all of the same grade.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages:
the invention provides a method for acquiring performance degradation indexes of non-oriented electrical steel after blanking, which is characterized in that a plurality of electrical steels with different shearing surface lengths are made into corresponding Epstein square rings to be subjected to an iron loss test so as to obtain corresponding iron loss values and magnetic induction strength indexes. And then fitting the length of the shearing surface of the electrical steel, the iron loss value and the magnetic induction intensity index to finally obtain the performance degradation rate of the electrical steel after shearing. The invention finds and provides that the deterioration degree of the electrical steel performance index is linearly increased along with the increase of the shearing length; therefore, the performance degradation rate obtained after fitting can accurately reflect the electromagnetic performance value of the electrical steel after being processed into the iron core, the actual measurement loss of the iron core is not required to be trial-manufactured during the iron core design, and a larger insurance value is not required to be reserved, so that the problems of redesign and excessive design quality in the current iron core design are solved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a method for obtaining a performance degradation index of a non-oriented electrical steel after blanking according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Through long-term observation and research, the surface of the cold-rolled electrical steel is smooth, but after shearing and blanking, a deformation area can generate an obvious metal flow deformation belt due to plastic deformation, and the metal flow deformation belt returns to cause the deterioration of an iron loss index, so that the increase of the iron core loss is caused. The deterioration degree of the performance index of the electrical steel after shearing is related to the shearing surface length after shearing, and the deterioration degree of the performance index linearly increases along with the increase of the shearing length. Based on the characteristics, the invention provides a method for acquiring the performance degradation index of the non-oriented electrical steel after blanking, and the performance degradation rate of each grade is calculated through a fitting curve of the performance and the shearing length of the electrical steel with different grades. The motor designer can calculate the length of the shearing surface of the iron core and the weight of the iron core according to a related design drawing, and the performance degradation rate is combined, so that the electromagnetic performance index of the iron core is calculated accurately, and the design of the iron core is guided. Specifically, please refer to the following embodiments.
Referring to fig. 1, in this embodiment, a method for obtaining performance degradation indicators after blanking of non-oriented electrical steel is provided, where the method specifically includes:
step S10: acquiring the length of a shearing surface corresponding to each electrical steel in more than two electrical steels;
step S20: respectively forming corresponding Epstein square ring samples by each electrical steel;
step S30: performing iron loss test on each Epstein square ring sample by adopting an Epstein square ring tester, and respectively obtaining an iron loss value and a magnetic induction intensity index of the electrical steel corresponding to each Epstein square ring;
step S40: and fitting the magnetic induction intensity indexes with the length of the shearing surface respectively according to the iron loss value to obtain the performance degradation rate of the electrical steel after shearing so as to guide the design of the motor iron core.
In step S10, the sheared shearing face length may be directly obtained according to the relevant machining parameters, or may be obtained by re-measurement. Wherein, more than two electrical steels should be electrical steels with different shearing surface lengths, but the grades are the same. That is, in the implementation of the present invention, the test data should be divided into groups of the same number to ensure the fitting accuracy of the test data.
Further, the number of the electrical steel is not limited, and may be 10, 20, etc., so as to ensure that enough test sample data is used for fitting.
In step S20, each electrical steel of the shear face length may constitute an epstein square circle sample and should be an epstein square circle that meets production requirements (e.g., meets corresponding national standard requirements).
In step S30, the iron loss is tested by a method known to those skilled in the art, and will not be described in detail. And obtaining an iron loss value and a magnetic induction strength index in the iron loss testing process.
In step S40, the method specifically includes:
1. fitting according to the iron loss value and the length of the shearing surface to obtain the performance degradation rate of the iron core loss after the electrical steel is sheared; the performance degradation rate of the core loss is a degradation rate due to the core loss of the electrical steel.
2. Fitting according to the magnetic induction intensity index and the length of the shearing surface to obtain the performance degradation rate of the magnetic induction intensity of the electrical steel after shearing; the deterioration rate of the magnetic strength is a deterioration rate corresponding to the magnetic strength of the electrical steel.
3. And guiding and designing the motor iron core based on the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength. Wherein, further include:
(1) obtaining the weight of an iron core of a target iron core to be designed; the target iron core is the iron core which needs to be designed and produced by designers, and the performance degradation condition of the electrical steel needs to be accurately estimated during design so as to ensure that the finally produced target iron core meets the requirement.
(2) Obtaining an electromagnetic performance value of the target iron core according to the shearing surface length, the iron core weight, the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength; wherein the electromagnetic performance values are used to guide the design of the motor core.
Further, the calculation of the electromagnetic property value of the target iron core can be performed by the following steps:
obtaining the performance degradation rate of the iron core loss of the target iron core according to the weight of the iron core;
based on P ═ P1+kpL, obtaining the iron core loss of the target iron core;
based on B ═ B1-kbL, obtaining the magnetic induction intensity of the target iron core;
representing the electromagnetic property value of the target iron core by adopting the iron core loss of the target iron core and the magnetic induction strength of the target iron core; wherein P is the core loss of the target core, P1To theoretical core loss, KpThe rate of deterioration of the core loss of the target core, B is the strength of induction, B is1As the theoretical strength of induction, KbL is the shear plane length of the target core, which is the rate of deterioration of the magnetic strength. Therefore, the performance degradation condition of the iron core loss and the performance degradation condition of the magnetic induction strength are subjected to different fitting calculation, the accuracy of the performance evaluation of the target iron core is guaranteed, different indexes can be evaluated and adjusted in a targeted manner, and the economy is realized.
The invention provides a method for acquiring performance degradation indexes of non-oriented electrical steel after blanking, which is characterized in that a plurality of electrical steels with different shearing surface lengths are made into corresponding Epstein square rings to be subjected to an iron loss test so as to obtain corresponding iron loss values and magnetic induction strength indexes. And then fitting the length of the shearing surface of the electrical steel, the iron loss value and the magnetic induction intensity index to finally obtain the performance degradation rate of the electrical steel after shearing. The invention finds and provides that the deterioration degree of the electrical steel performance index is linearly increased along with the increase of the shearing length; therefore, the performance degradation rate obtained after fitting can accurately reflect the electromagnetic performance value of the electrical steel after being processed into the iron core, the actual measurement loss of the iron core is not required to be trial-manufactured during the iron core design, and a larger insurance value is not required to be reserved, so that the problems of redesign and excessive design quality in the current iron core design are solved.
Further, the present invention provides the following specific exemplary descriptions:
i, testing the magnetic performance deterioration condition of the electrical steel of the brand 1
And an Epstein square ring tester is selected to test the iron loss and the change of the magnetic induction intensity index. Specifically, the same test steel plate with the size of 30 × 300mm is sequentially cut into steel bars with different sizes, and the steel bars are spliced together after each cutting to form an Epstein ring to test the magnetic property change, so that the magnetic property degradation curve of the mark non-oriented electrical steel is obtained.
TABLE 1a
The fitted curve is as follows:
TABLE 1b
| Item | Fitting equation | Rate of Performance deterioration (k) |
| P1.0/50 | 1.317+0.000259*L | 0.000259 |
| P1.5/50 | 3.19+0.000382*L | 0.000382 |
| B2500 | 1.644-0.000011*L | 0.000011 |
| B5000 | 1.725-0.000005*L | 0.000005 |
And finally, calculating the electromagnetic performance value of the target iron core according to the length of the shearing surface, the preset iron core weight and the performance degradation rate.
Second, the magnetic performance deterioration condition of the electrical steel of the brand 2 is tested
And an Epstein square ring tester is selected to test the iron loss and the change of the magnetic induction intensity index. Specifically, the same test steel plate with the size of 30 × 300mm is sequentially cut into steel bars with different sizes, and the steel bars are spliced together to test the magnetic property change in an Epstein square ring after each cutting is finished, so that the magnetic property deterioration curve of the non-oriented electrical steel of the brand of the factory is obtained.
TABLE 2a
The fitted curve is as follows:
TABLE 2b
| Item | Fitting equation | Rate of Performance deterioration (k) |
| P1.0/50 | 0.7775+0.000172*L | 0.000172 |
| P1.5/50 | 2.014+0.000304*L | 0.000304 |
| B2500 | 1.621-0.000017*L | 0.000017 |
| B5000 | 1.72-0.000007*L | 0.000007 |
And finally, calculating and obtaining the electromagnetic performance value of the target iron core according to the length of the shearing surface, the preset iron core weight and the performance degradation rate.
Second, the magnetic performance deterioration condition of the electrical steel of the brand 1 is tested
The purpose is as follows: magnetic property deterioration test (brand 3)
And an Epstein square ring tester is selected to test the iron loss and the change of the magnetic induction intensity index. Specifically, the same test steel plate with the size of 30 × 300mm is sequentially cut into steel bars with different sizes, and the steel bars are spliced together after each cutting to form an Epstein ring to test the magnetic property change, so that the magnetic property deterioration curve of the non-oriented electrical steel of the brand of the factory is obtained.
TABLE 3a
The fitted curve is as follows:
TABLE 3b
And finally, calculating and obtaining the electromagnetic performance value of the target iron core according to the length of the shearing surface, the preset iron core weight and the performance degradation rate.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The method functions of the present invention may be stored in a computer-readable storage medium if they are implemented in the form of software function modules and sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method for obtaining performance deterioration indexes of non-oriented electrical steel after blanking is characterized by comprising the following steps:
acquiring the length of a shearing surface corresponding to each electrical steel in more than two electrical steels;
respectively forming corresponding Epstein square ring samples by each electrical steel;
performing iron loss test on each Epstein square ring sample by adopting an Epstein square ring tester, and respectively obtaining an iron loss value and a magnetic induction intensity index of the electrical steel corresponding to each Epstein square ring;
and fitting the magnetic induction intensity indexes with the length of the shearing surface respectively according to the iron loss value to obtain the performance degradation rate of the electrical steel after shearing so as to guide the design of the motor iron core.
2. The method according to claim 1, wherein the obtaining the performance degradation rate of the electrical steel after shearing according to fitting the iron loss value and the magnetic induction strength index with the shearing surface length respectively for guiding the design of the motor iron core comprises:
fitting according to the iron loss value and the length of the shearing surface to obtain the performance degradation rate of the iron core loss after the electrical steel is sheared;
fitting according to the magnetic induction intensity index and the length of the shearing surface to obtain the performance degradation rate of the magnetic induction intensity of the electrical steel after shearing;
and guiding and designing the motor iron core based on the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength.
3. The method of claim 2, wherein the guided design of the motor core based on the rate of performance degradation of the core loss and the rate of performance degradation of the strength of magnetic induction comprises:
obtaining the weight of an iron core of a target iron core to be designed;
obtaining an electromagnetic performance value of the target iron core according to the shearing surface length, the iron core weight, the performance degradation rate of the iron core loss and the performance degradation rate of the magnetic induction strength; wherein the electromagnetic performance values are used to guide the design of the motor core.
4. The method of claim 3, wherein said obtaining an electromagnetic performance value for the target core as a function of the shear plane length, the core weight, the rate of performance degradation of the core loss, and the rate of performance degradation of the strength of induction comprises:
obtaining the performance degradation rate of the iron core loss of the target iron core according to the weight of the iron core;
based on P ═ P1+kpL, obtaining the iron core loss of the target iron core;
based on B ═ B1-kbL, obtaining the magnetic induction intensity of the target iron core;
representing the electromagnetic property value of the target iron core by adopting the iron core loss of the target iron core and the magnetic induction strength of the target iron core;
wherein P is the core loss of the target core, P1To theoretical core loss, KpThe rate of deterioration of the core loss of the target core, B is the strength of induction, B is1As the theoretical strength of induction, KbL is the shear plane length of the target core, which is the rate of deterioration of the magnetic strength.
5. The method of claim 1, wherein the electrical steels of different shear face lengths are all of the same grade.
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| JPH07191104A (en) * | 1993-12-27 | 1995-07-28 | Kyushu Electric Power Co Inc | Iron core deterioration diagnostic method for ac generator and motor |
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Effective date of registration: 20231008 Address after: No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province, 064400 Applicant after: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Address before: 064400 No. 025, Zhao an street, western industrial area, Qian'an, Tangshan City, Hebei Applicant before: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Applicant before: BEIJING SHOUGANG Co.,Ltd. |