CN113945270B - Transformer noise characteristic analysis method capable of considering different load temperature rise conditions - Google Patents
Transformer noise characteristic analysis method capable of considering different load temperature rise conditions Download PDFInfo
- Publication number
- CN113945270B CN113945270B CN202111201323.3A CN202111201323A CN113945270B CN 113945270 B CN113945270 B CN 113945270B CN 202111201323 A CN202111201323 A CN 202111201323A CN 113945270 B CN113945270 B CN 113945270B
- Authority
- CN
- China
- Prior art keywords
- transformer
- noise
- load
- core
- rolling direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to a noise characteristic analysis method of a transformer capable of considering different load temperature rise conditions. Comprising the following steps: obtaining a magnetostriction characteristic curve according to the acquired magnetostriction data of the silicon steel sheet; collecting vibration displacement of a transformer core; obtaining the positive strain of the silicon steel sheet forming the transformer core by using a reverse interpolation method; measuring and calculating total length of the transformer iron core along the rolling direction and the perpendicular rolling direction of the silicon steel sheet respectively; measuring rated magnetic density of a transformer iron core, and respectively carrying out actual magnetic density of the transformer under no-load and load; measuring the distance between the far-field measuring point and the transformer core; measuring rated current and actual current of the transformer under load; and estimating the noise of the transformer under the no-load condition and the load condition according to the noise estimation empirical formula of the transformer under the no-load condition and the noise estimation empirical formula of the transformer under the load condition respectively. The invention provides a theoretical basis for the estimation of the core vibration noise of the transformer under no load and load respectively, and further evaluates the transformer noise generation standard.
Description
Technical Field
The invention relates to a noise characteristic analysis method of a transformer capable of considering different load temperature rise conditions, in particular to a method for estimating vibration noise of a transformer core under no-load and load conditions.
Background
With the development of power industry, the demands of human beings on electric power are increasing, and the application of a power transformer as one of main equipment of a power plant and a transformer substation in power grid construction is also increasing. The power transformer can vibrate in the operation process, so that equipment aging can be accelerated, normal operation of a power grid can be threatened in severe cases, and life and health of people are endangered by noise generated by the power transformer. Therefore, the problem of noise of the power transformer is reasonably and scientifically solved, and the noise is an urgent problem to be solved by the transformer manufacturing and using departments.
The noise generated by the transformer can be divided into body noise and cooling device noise. The body noise is divided into the noise of the transformer iron core vibration noise, the coil vibration noise, the oil tank (magnetic shielding) and the like, and the body structures of various transformers are similar. It is believed that body noise is mainly due to electromagnetic attraction of the transformer core, magnetostriction effects, electromotive force of the windings, and magnetostriction effects of the oil tank (magnetic shielding).
The vibration of the transformer core mainly comes from magnetostriction. The electromagnetic attraction force acts on the transformer mainly at the joint of the iron core, and is caused by the normal magnetic flux passing through the silicon steel lamination at the joint, and is generally smaller in the part, so that the clamping force can be increased through the fastener, and the vibration of the transformer can be limited. Magnetostriction exists throughout the core, which is caused by the magnetic field distributed across the transformer core. The magnetostriction of the core contributes to the transformer noise to a different extent at different magnetic flux densities. Noise sound pressure levels generated by the transformers under the condition of no load and load are different, noise estimation is needed to be carried out on the incoming transformers, and whether the transformers meet the environmental protection requirement is determined according to corresponding noise standards.
According to the reasons, the invention provides a method for estimating the vibration noise of the transformer core, which estimates the noise generated by the transformer according to different parameters under the condition of no-load and load of the transformer and provides effective reference for the suppression of the transformer substation noise.
Disclosure of Invention
The invention aims to solve the problems and provide a noise characteristic analysis method of a transformer capable of considering different load temperature rising conditions, which establishes a noise estimation formula of the transformer under the condition of no load and load based on the relation between a magneto-mechanical coupling theory and magnetostriction stress strain, can obtain the noise of the transformer under the condition of no load and load respectively, and can estimate the noise generated by the vibration of an iron core of the transformer before the transformer is put into operation, thereby judging whether the noise meets the environmental protection requirement and providing a basis for further analyzing the vibration noise of the iron core of the transformer.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a method for analyzing noise characteristics of transformers capable of considering different load temperature rise conditions comprises the following steps:
(1) Collecting basic data: magnetostriction measurement is carried out on the silicon steel sheet which is uniform in magnetic flux density distribution and of the same type as the transformer core by utilizing a magnetostriction measurement system, so that magnetostriction strain data of the silicon steel sheet in a rolling direction and perpendicular to the rolling direction are obtained;
(2) Extracting butterfly curve peak value lambda under alternating magnetization by using interpolation method according to the data acquired in the step (1) pp And magnetic density maximum B m Drawing a magnetostriction characteristic curve;
(3) Measuring displacement data of the transformer core by using a laser position finder, and analyzing the deformation quantity of the silicon steel sheet causing the vibration displacement of the transformer core according to the magnetostriction characteristic curve obtained in the step (2) based on a magneto-mechanical coupling theory;
(4) Measuring the rated magnetic flux density of the transformer core and the actual magnetic flux density of the transformer core;
(5) Measuring total length Sigma l of transformer core along rolling direction x And the total length Sigma l of the joint along the vertical rolling direction y ；
(6) Determining the distance D between the far-field measuring point and the transformer core, and predicting the no-load noise L of the transformer T ；
(7) Determining rated current and actual current of a transformer, and predicting load noise L of the transformer N 。
In one embodiment of the present invention, the butterfly curve peak-to-peak value λ in the step (2) pp Refers to the positive peak minus the negative peak of the magnetostrictive curve, which reflects the maximum amplitude of deformation of the material.
In an embodiment of the present invention, in the step (3), deformation of the silicon steel sheet that causes vibration displacement of the transformer core is analyzed, and the specific method includes measuring, by a laser position finder, displacements of the transformer core in x, y, and z directions respectively, and obtaining a displacement x, where an empirical formula is:
based on the magnetostriction characteristic curve obtained by the interpolation method in the step (2), obtaining the strain epsilon of the silicon steel sheet along the rolling direction respectively by measuring the vibration displacement of the transformer core in three directions based on the magneto-mechanical coupling theory by using a reverse interpolation method x And a strain amount epsilon in the vertical rolling direction y 。
In an embodiment of the present invention, the pre-estimating no-load noise of the transformer in the step (6) has the following specific formula:
wherein L is T Is no-load noise of the transformer, B is actual magnetic density of a transformer iron core, B m Rated magnetic density epsilon for transformer iron core x Is the positive strain epsilon of the silicon steel sheet along the rolling direction y Is the positive strain of the silicon steel sheet along the vertical rolling direction, l x Is the total length of the transformer iron core along the rolling direction of the silicon steel sheet, l y The total length of the transformer iron core along the vertical rolling direction of the silicon steel sheet is D, and the distance between the far-field measuring point and the transformer iron core is D.
In an embodiment of the present invention, the load noise of the transformer is estimated in the step (7), and a specific formula thereof is as follows:
wherein L is T Is the no-load noise of the transformer, I is the actual current of the transformer, I N Is the rated current of the transformer.
Compared with the prior art, the invention has the following beneficial effects:
1. the method provides a theoretical basis for the estimation of the core vibration noise of the transformer under the condition of no-load and load respectively, and evaluates the transformer noise generation standard according to the method.
2. The method lays a foundation for whether the transformer meets the environmental protection requirement.
3. According to the invention, an empirical formula of magnetostriction stress and strain of the transformer iron core silicon steel sheet is utilized, and a magneto-mechanical coupling theory is combined, so that an estimated formula of vibration noise of the transformer iron core caused by magnetostriction is provided, the vibration condition of the transformer iron core can be effectively analyzed, and further the noise generated by the vibration condition can be analyzed, thereby providing effective reference and basis for the suppression of transformer substation noise.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a magnetostriction characteristic curve of a silicon steel sheet in a rolling direction and a perpendicular rolling direction, respectively.
Fig. 3 shows the lengths Σl of the transformer cores in the rolling direction x And a length Sigma l in the vertical rolling direction y And a schematic diagram of far-field measuring point distance calculation.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings.
As shown in fig. 1, a method for analyzing noise characteristics of a transformer capable of considering different load temperature rise conditions includes the following steps:
(1) Collecting basic data: magnetostriction measurement is carried out on the silicon steel sheet which is uniform in magnetic flux density distribution and of the same type as the transformer core by utilizing a magnetostriction measurement system, so that magnetostriction strain data of the silicon steel sheet in a rolling direction and perpendicular to the rolling direction are obtained;
(2) Extracting butterfly curve peak value lambda under alternating magnetization by using interpolation method according to the data acquired in the step (1) pp And magnetic density maximum B m Drawing a magnetostriction characteristic curve;
(3) Measuring displacement data of the transformer core by using a laser position finder, and analyzing the deformation quantity of the silicon steel sheet causing the vibration displacement of the transformer core according to the magnetostriction characteristic curve obtained in the step (2) based on a magneto-mechanical coupling theory;
(4) Measuring the rated magnetic flux density of the transformer core and the actual magnetic flux density of the transformer core;
(5) Measuring total length Sigma l of transformer core along rolling direction x And the total length Sigma l of the joint along the vertical rolling direction y ；
(6) Determining the distance D between the far-field measuring point and the transformer core, and predicting the no-load noise L of the transformer T ；
(7) Determining rated current and actual current of a transformer, and predicting load noise L of the transformer N 。
The present invention will be further described below by taking a single-phase three-pole transformer as an example.
A method for estimating vibration noise of a transformer core is characterized by comprising the following steps:
(1) Collecting basic data: the magnetostriction characteristics of silicon steel sheets of different types, models and manufacturers are different, and in order to study the vibration of the laminated iron core caused by the magnetostriction effect, magnetostriction measurement is firstly carried out on the silicon steel sheets used by the iron core. Experiments were performed using a one-dimensional monolithic magnetostriction measurement system (MST 500) manufactured by Brockhaus, germany. The magnetostriction is measured by measuring an oriented silicon steel sheet (B30P 105) produced by Bao steel, wherein one end of the sample sheet is pressed, and the other end is free and is stuck with a reflecting sheet. The silicon steel sheet sample used for measurement is sheared according to an included angle of 0 degree and 90 degrees with the rolling direction, so that magnetostriction strain data of the silicon steel sheet can be obtained when the silicon steel sheet is magnetized along the rolling direction and magnetized perpendicular to the rolling direction.
(2) According to the data acquired in the step (1), butterfly curves of the silicon steel sheet in the rolling direction and the perpendicular rolling direction can be obtained. Butterfly curve peak-to-peak lambda pp Refers to the positive peak minus the negative peak of the magnetostrictive curve, which reflects the maximum amplitude of deformation of the material. Fig. 2 shows magnetostriction characteristic curves of oriented silicon steel sheets produced as model (B30P 105) of the steel sheet in the rolling direction and in the perpendicular rolling direction, respectively (fig. 2 (a), (B)).
(3) And (3) measuring displacement data of the transformer iron core along the x, y and z directions respectively by using a laser position finder, and analyzing the deformation quantity of the silicon steel sheet causing the vibration displacement of the transformer iron core by adopting an inverse interpolation method according to the magnetostriction characteristic curve obtained in the step (2) based on a magneto-mechanical coupling theory.
(4) The rated flux density of the transformer core and the actual flux density of the transformer core are measured.
(5) Measuring total length Sigma l of transformer core along rolling direction x =0.6m, total length Σl of joint in vertical rolling direction y ＝0.575m。
(6) Determining the distance D between the far-field measuring point and the transformer core, and predicting the no-load noise L of the transformer T 。
(7) Determining rated current and actual current of a transformer, and predicting load noise L of the transformer N 。
Magnetostriction of a silicon steel sheet refers to a phenomenon that the size of the silicon steel sheet is increased along the direction of magnetic force lines and is reduced perpendicular to the direction of magnetic force lines under the action of an externally applied magnetic field. This phenomenon causes a vibration displacement of the transformer core. The displacement of the transformer iron core measured in the step (3) along the x, y and z directions is respectively obtained, and the displacement x is obtained, and the empirical formula is as follows:
obtaining strain epsilon of the silicon steel sheet along the rolling direction respectively by measuring vibration displacement of the transformer iron core in three directions based on a magneto-mechanical coupling theory by using a magnetostriction characteristic curve obtained by an interpolation method in the step (2) and using a reverse interpolation method x And a strain amount epsilon in the vertical rolling direction y 。
Assuming that the transformer is under no-load condition, the actual magnetic density B and the rated magnetic density B m The ratio of (2) is 0.95, and the distance between the far-field measuring point and the transformer core is 2m. The noise estimate for the transformer under no-load conditions can be determined by:
wherein L is T Is no-load noise of the transformer, B is actual magnetic density of a transformer iron core, B m Rated magnetic density epsilon for transformer iron core x Is the positive strain epsilon of the silicon steel sheet along the rolling direction y Is the positive strain of the silicon steel sheet along the vertical rolling direction, l x Is the total length of the transformer iron core along the rolling direction of the silicon steel sheet, l y The total length of the transformer iron core along the vertical rolling direction of the silicon steel sheet is D, and the distance between the far-field measuring point and the transformer iron core is D.
Fig. 3 shows the lengths Σl of the transformer cores in the rolling direction x And a length Sigma l in the vertical rolling direction y And a schematic diagram of far-field measuring point distance calculation.
Hypothesis becomesUnder the load condition of the presser, the actual magnetic density B and the rated magnetic density B m The ratio of the voltage to the current is still 0.95, the distance between the far-field measuring point and the transformer core is still 2m, and the actual load current I and the rated current I of the transformer N The ratio of (2) is 0.85. The noise estimate for a transformer under load can be determined by:
wherein L is T Is the no-load noise of the transformer, I is the actual current of the transformer, I N Is the rated current of the transformer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which are intended to be covered by the scope of the claims.
Claims (5)
1. The method for analyzing the noise characteristics of the transformer capable of considering different load temperature rise conditions is characterized by comprising the following steps of:
(1) Collecting basic data: magnetostriction measurement is carried out on the silicon steel sheet which is uniform in magnetic flux density distribution and of the same type as the transformer core by utilizing a magnetostriction measurement system, so that magnetostriction strain data of the silicon steel sheet along the rolling direction and perpendicular to the rolling direction are obtained;
(2) Extracting butterfly curve peak value lambda under alternating magnetization by using interpolation method according to the data acquired in the step (1) pp And magnetic density maximum B m Drawing a magnetostriction characteristic curve;
(3) Measuring displacement data of the transformer core by using a laser position finder, and analyzing the deformation quantity of the silicon steel sheet causing the vibration displacement of the transformer core according to the magnetostriction characteristic curve obtained in the step (2) based on a magneto-mechanical coupling theory;
(4) Measuring the rated magnetic flux density of the transformer core and the actual magnetic flux density of the transformer core;
(5) Measuring total length Sigma l of transformer core along rolling direction x And the total length Sigma l of the joint along the vertical rolling direction y ；
(6) Determining the distance D between the far-field measuring point and the transformer core, and predicting the no-load noise L of the transformer T ；
(7) Determining rated current and actual current of a transformer, and predicting load noise L of the transformer N 。
2. The method for analyzing noise characteristics of a transformer capable of taking into account different load temperature rise conditions according to claim 1, wherein the butterfly curve peak-to-peak λ in step (2) pp Refers to the positive peak minus the negative peak of the magnetostrictive curve, which reflects the maximum amplitude of deformation of the material.
3. The method for analyzing noise characteristics of transformers according to claim 1, wherein in the step (3), the deformation amount of the silicon steel sheet causing the vibration displacement of the transformer core is analyzed, and the method comprises the steps of measuring the displacement of the transformer core along the x, y and z directions respectively by a laser position finder, and obtaining the displacement x, wherein the empirical formula is as follows:
based on the magnetostriction characteristic curve obtained by the interpolation method in the step (2), obtaining the strain epsilon of the silicon steel sheet along the rolling direction respectively by measuring the vibration displacement of the transformer core in three directions based on the magneto-mechanical coupling theory by using a reverse interpolation method x And a strain amount epsilon in the vertical rolling direction y 。
4. The method for analyzing the noise characteristics of the transformer according to claim 1, wherein the step (6) is characterized in that the no-load noise of the transformer is estimated according to the following specific formula:
wherein L is T Is no-load noise of the transformer, B is actual magnetic density of a transformer iron core, B m Rated magnetic density epsilon for transformer iron core x Is the positive strain epsilon of the silicon steel sheet along the rolling direction y Is the positive strain of the silicon steel sheet along the vertical rolling direction, l x Is the total length of the transformer iron core along the rolling direction of the silicon steel sheet, l y The total length of the transformer iron core along the vertical rolling direction of the silicon steel sheet is D, and the distance between the far-field measuring point and the transformer iron core is D.
5. The method for analyzing the noise characteristics of the transformer according to claim 1, wherein the step (7) is characterized in that the estimated load noise of the transformer comprises the following specific formula:
wherein L is T Is the no-load noise of the transformer, I is the actual current of the transformer, I N Is the rated current of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111201323.3A CN113945270B (en) | 2021-10-15 | 2021-10-15 | Transformer noise characteristic analysis method capable of considering different load temperature rise conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111201323.3A CN113945270B (en) | 2021-10-15 | 2021-10-15 | Transformer noise characteristic analysis method capable of considering different load temperature rise conditions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113945270A CN113945270A (en) | 2022-01-18 |
| CN113945270B true CN113945270B (en) | 2023-05-12 |
Family
ID=79330009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111201323.3A Active CN113945270B (en) | 2021-10-15 | 2021-10-15 | Transformer noise characteristic analysis method capable of considering different load temperature rise conditions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113945270B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447743B (en) * | 2021-06-28 | 2024-03-12 | 西安西电变压器有限责任公司 | Transformer no-load noise determination method, device and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359549A (en) * | 2014-11-27 | 2015-02-18 | 国家电网公司 | Transformer core vibration noise analysis method |
| JP2015063753A (en) * | 2013-08-30 | 2015-04-09 | Ｊｆｅスチール株式会社 | Grain oriented magnetic steel sheet for low noise transformer iron core and method for manufacturing the same |
| JP2019040951A (en) * | 2017-08-23 | 2019-03-14 | 新日鐵住金株式会社 | Transformer noise prediction method |
| CN111382533A (en) * | 2020-03-04 | 2020-07-07 | 海南金盘智能科技股份有限公司 | Simulation analysis method for electromagnetic vibration noise of transformer |
| CN112287583A (en) * | 2020-10-29 | 2021-01-29 | 广东电网有限责任公司电力科学研究院 | Noise simulation prediction method for transformer |
-
2021
- 2021-10-15 CN CN202111201323.3A patent/CN113945270B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015063753A (en) * | 2013-08-30 | 2015-04-09 | Ｊｆｅスチール株式会社 | Grain oriented magnetic steel sheet for low noise transformer iron core and method for manufacturing the same |
| CN104359549A (en) * | 2014-11-27 | 2015-02-18 | 国家电网公司 | Transformer core vibration noise analysis method |
| JP2019040951A (en) * | 2017-08-23 | 2019-03-14 | 新日鐵住金株式会社 | Transformer noise prediction method |
| CN111382533A (en) * | 2020-03-04 | 2020-07-07 | 海南金盘智能科技股份有限公司 | Simulation analysis method for electromagnetic vibration noise of transformer |
| CN112287583A (en) * | 2020-10-29 | 2021-01-29 | 广东电网有限责任公司电力科学研究院 | Noise simulation prediction method for transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113945270A (en) | 2022-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Somkun et al. | Magnetostriction anisotropy and rotational magnetostriction of a nonoriented electrical steel | |
| Moses et al. | Contribution of magnetostriction to transformer noise | |
| US20140118003A1 (en) | Fault diagnosis and preliminary location system and method for transformer core looseness | |
| CN113945270B (en) | Transformer noise characteristic analysis method capable of considering different load temperature rise conditions | |
| Vandevelde et al. | Magnetic forces and magnetostriction in electrical machines and transformer cores | |
| Hubert et al. | Influence of plastic strain on magnetic behaviour of non-oriented Fe–3Si and application to manufacturing test by punching | |
| Takahashi et al. | Effect of stress on iron loss of motor core | |
| Kou et al. | Nonlinear analytical modeling of hybrid-excitation double-sided linear eddy-current brake | |
| Mthombeni et al. | Physical basis for the variation of lamination core loss coefficients as a function of frequency and flux density | |
| Baghel et al. | Effect of mechanical stress on different core loss components along orthogonal directions in electrical steels | |
| Xiao et al. | Modeling of scalar dependencies of soft magnetic material magnetization for electrical machine finite-element simulation | |
| Von Pfingsten et al. | Influence of axial mechanical stress on the magnetic properties of non-oriented electrical steel | |
| Chen et al. | Analysis and experiment of transformer vibration and noise considering electrical steel sheet magnetostriction | |
| Wei et al. | Prediction of magnetic losses in giant magnetostrictive materials under different sinusoidal excitation magnetic fields | |
| Bi et al. | A new high-frequency iron loss model including additional iron losses due to punching and burrs’ connection | |
| CN2713476Y (en) | Magnetic sensor for non-contact measurement of high-frequency heavy current | |
| CN114613453A (en) | Dynamic magnetostriction determination method and system based on JA model | |
| Zhang et al. | Analysis of Magneto-Mechanical Coupling Model of Anodic Saturable Reactor Considering Anisotropy with UHVDC Converter Valve | |
| Kaido et al. | Punching deterioration mechanism of magnetic properties of cores | |
| Li et al. | Calculation method and application of magnetostrictive vibration of wound core | |
| CN112816763A (en) | Tooth-shaped opening-closing type small current sensor | |
| Li et al. | Characteristics Analysis and Experimental Verification of Amorphous Metal Distribution Transformer Core Vibration Coupled by Electromagnetic-Mechanical Field | |
| Zhu et al. | Research on Split-Core Reactor Vibration Reduction Method Based on Magnetostrictive Effect | |
| Amorós et al. | Study of end effects on the performance of the linear switched reluctance motor | |
| Chen et al. | Study on Characteristics of Silicon Steel Sheet and Core of PMSM Used in Deep Sea |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |