CN112630708A - Electromagnet eddy current test device and method - Google Patents
Electromagnet eddy current test device and method Download PDFInfo
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- CN112630708A CN112630708A CN202011472801.XA CN202011472801A CN112630708A CN 112630708 A CN112630708 A CN 112630708A CN 202011472801 A CN202011472801 A CN 202011472801A CN 112630708 A CN112630708 A CN 112630708A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1253—Measuring galvano-magnetic properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1261—Measuring magnetic properties of articles or specimens of solids or fluids using levitation techniques
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The electromagnet eddy current test device and the method comprise a suspension electromagnet module, and are characterized in that: the device comprises a suspension electromagnet module, a support, a rotary table, a driving assembly, a Hall element and a tension sensor, wherein the support is used for mounting the suspension electromagnet module, the rotary table is supported on the support and is positioned above the suspension electromagnet module, the driving assembly is used for driving the rotary table to rotate, the Hall element is arranged on the suspension electromagnet module and is used for measuring an air gap magnetic field, the tension sensor is arranged on the suspension electromagnet module and is used for measuring suspension suction, and the rotary table is horizontally arranged and rotates along with the driving of the driving assembly to enable the suspension electromagnet module and the rotary table to. The invention simulates the relative movement of the suspension electromagnet and the F rail when the maglev train runs by using the running mode of the turntable, obtains the corresponding relation curve of the air gap magnetic field and the suspension suction force, reflects the influence of the steel rail eddy current on the suspension electromagnet suction force by using a real-time curve graph, provides data reference for the suspension electromagnet design, enables the test condition to be closer to the running working condition of the maglev train, and improves the simulation precision of the test.
Description
Technical Field
The invention relates to an electromagnet eddy current test device, and belongs to the technical field of suspension control.
Background
The suspension control technology is the core technology of the magnetic-levitation train, the electromagnet is an actuating element of the suspension control system and is used for providing electromagnetic force required for completing the suspension function, and the electromagnetic property of the electromagnet directly influences the performance of the suspension control system. The track of the medium-low speed maglev train adopts a form of a non-laminated steel rail, and in the running process of the train, the electromagnet and the track can generate relative motion to cause the track to cut magnetic induction lines, so that eddy current is induced in the track. This eddy current phenomenon was first discovered by scholars in germany and japan and studied on the aspects of levitation suction force and resistance. Studies have shown that this eddy current phenomenon in the F-rail causes a reduction in the magnetic flux density in the levitation air gap, which in turn leads to a decrease in the levitation attraction force, and increases with increasing speed, and becomes more pronounced closer to the vehicle head. The eddy current introduced by the moving electromagnet has larger density at the corresponding tracks at the two ends of the electromagnet, and has smaller density at the corresponding tracks in the middle of the electromagnet, and the directions of the eddy currents at the two ends are opposite, so that the track eddy current at the front end of the vehicle motion weakens the levitation magnetic field, and the track eddy current at the rear end strengthens the levitation magnetic field. Under the same suspension load, the electromagnet current will increase and the temperature rise will increase. In order to design an electromagnet meeting the vehicle operation requirement, the influence of eddy current on the attraction force of the electromagnet needs to be accurately calculated. Because the eddy current is influenced by various factors such as steel rail materials, speed and the like, the calculation difficulty is high through an analytical method or a numerical method, and the calculation data is lack of experimental verification. According to the invention, the influence of eddy current on the electromagnet is obtained through comparison and calculation by actually testing the suspension attraction of the electromagnet under different vehicle speeds and air gap conditions, and the calculation data of an analytic method or a numerical method can be verified, so that reference is provided for electromagnet design.
At present, the running speed of a medium-low speed maglev train can be estimated to reach 160km/h, the influence of eddy current in a track cannot be ignored, and in order to verify whether an electromagnet scheme can meet the speed-up requirement of the medium-low speed maglev train and indexes such as passenger capacity, the electromagnet module scheme of the train needs to be checked, and the characteristics of steel rail eddy current of an electromagnet in a dynamic running state and the influence of the electromagnet on suspension suction are simulated.
Disclosure of Invention
The invention provides an electromagnet eddy current test device and method, which simulate the relative motion of a suspension electromagnet and an F rail when a maglev train runs by using the running mode of a turntable, namely verify the influence of steel rail eddy current on the suspension attraction of the suspension electromagnet by using a miniaturized test device to obtain a corresponding relation curve of an air gap magnetic field and the suspension attraction, reflect the influence of the steel rail eddy current on the suspension electromagnet attraction by using a real-time curve graph, provide data reference for the design of the suspension electromagnet, enable the test condition to be closer to the running working condition of the suspension train, and improve the simulation precision of the test.
In order to achieve the purpose, the invention adopts the technical scheme that:
electromagnet eddy current testing device, including suspension electromagnet module, its characterized in that: the device comprises a suspension electromagnet module, a support, a rotary table, a driving assembly, a Hall element and a tension sensor, wherein the support is used for mounting the suspension electromagnet module, the rotary table is supported on the support and is positioned above the suspension electromagnet module, the driving assembly is used for driving the rotary table to rotate, the Hall element is arranged on the suspension electromagnet module and is used for measuring an air gap magnetic field, the tension sensor is arranged on the suspension electromagnet module and is used for measuring suspension suction, and the rotary table is horizontally arranged and rotates along with the driving of the driving assembly to enable the suspension electromagnet module and the rotary table to.
Preferably, the support comprises a supporting seat and an installation arm fixed on the supporting seat, the suspension electromagnet module is arranged on the installation arm, the turntable is coaxially supported on the supporting seat, and the driving assembly is arranged in the supporting seat and is in transmission connection with the turntable.
Preferably, the installation arm is L-shaped and is obliquely arranged, the lower end of the installation arm is fixed with the supporting seat, and the upper end of the installation arm is connected with the suspension electromagnet module, so that the suspension electromagnet module is arranged on the periphery of the supporting seat and is positioned below the turntable.
Preferably, the suspension electromagnet modules are arc-shaped and two in number, the arc-shaped and two are coaxial with the turntable, each suspension electromagnet module is connected with two mounting arms, the end parts of the suspension electromagnet modules are respectively connected with the upper ends of the mounting arms, and the two suspension electromagnet modules are symmetrically distributed on the periphery of the supporting seat.
Preferably, the supporting seat is provided with a thrust bearing coaxial with the turntable, the turntable is supported on the thrust bearing, and the thrust bearing is driven to synchronously rotate when the turntable rotates.
Preferably, the drive assembly comprises a motor arranged in the support seat and a connecting shaft coaxially connected with an output shaft of the motor, the connecting shaft is arranged in the support seat along the central axis of the turntable and is coaxially connected with the turntable through a radial bearing so as to drive the turntable to rotate.
Preferably, the hall elements are three-dimensional hall magnetosensitive sensors, the hall elements are in a patch shape and are tightly attached to the surface of the polar plate of the suspension electromagnet module, and the hall elements are distributed on the surface of the polar plate of the suspension electromagnet module in a matrix manner.
The electromagnet eddy current test method adopts the electromagnet eddy current test device for testing, and is characterized in that: the rotating disc is driven to rotate, eddy current is induced between the rotating disc and the suspension electromagnet module, a dynamic air gap magnetic field is formed, the air gap magnetic field is measured through the Hall element, the suspension attraction of the suspension electromagnet module is calculated according to air gap magnetic field data, the suspension attraction of the suspension electromagnet module is directly measured through the tension sensor, the calculated suspension attraction and the directly measured suspension attraction are mutually corrected, and a corresponding relation curve of the air gap magnetic field and the suspension attraction is obtained.
Preferably, the step of calculating the levitation attraction of the levitation electromagnet module according to the air gap magnetic field data refers to performing multi-scale discrete wavelet analysis on the measurement data of the plurality of hall elements distributed in a matrix to form fitting magnetic field data, and then calculating the levitation attraction of the levitation electromagnet module by combining the formed fitting magnetic field data with an attraction calculation formula.
Preferably, the speed of the rotating disk is adjusted, eddy current formed between the rotating disk and the suspension electromagnet module is changed, the air gap magnetic field is changed, a plurality of corresponding relation curves of the air gap magnetic field and the suspension attraction force are obtained, and/or the vertical gap between the rotating disk and the suspension electromagnet module is adjusted, and the corresponding relation change of the air gap magnetic field and the suspension attraction force under different air gaps is obtained.
The invention has the beneficial effects that:
1. the suspension electromagnet module in the electromagnet eddy current test device is arranged on the bracket, the turntable is positioned above the suspension electromagnet module and rotates along with the driving of the driving assembly, so that the suspension electromagnet module and the turntable move relatively to induce eddy current to form a dynamic air gap magnetic field, the relative movement of the suspension electromagnet and an F rail is simulated when a maglev train runs in a rotating mode of the turntable, and the influence of the steel rail eddy current on the suspension attraction of the suspension electromagnet is verified by using a miniaturized test device.
2. The supporting seat is provided with a thrust bearing which is coaxial with the rotary table, the rotary table is supported on the thrust bearing, the connecting shaft is coaxially connected with the rotary table through a radial bearing, the thrust bearing provides radial axial force, the influence of suction force between the rotary table and the suspension electromagnet module on the rotation of the rotary table is offset through the thrust bearing, the influence of radial suction force between the rotary table and the suspension electromagnet module on the rotation of the rotary table is offset through the radial bearing, and the operation reliability of the whole testing device is improved.
3. The method comprises the steps of measuring an air gap magnetic field formed between a rotary table and a suspension electromagnet module by using a Hall element, calculating the magnitude of suspension attraction by using the relation between air gap magnetic field data and the suspension attraction, simultaneously directly measuring the suspension attraction of the suspension electromagnet module by using a tension sensor, mutually correcting the calculated suspension attraction and the directly measured suspension attraction to obtain a corresponding relation curve of the air gap magnetic field and the suspension attraction, reflecting the influence of the eddy current of a steel rail on the suspension electromagnet attraction by using a real-time curve graph, obtaining the influence of the eddy current on the attraction at different speeds by comparing the change of the suspension attraction, and providing data reference for the design of the suspension electromagnet.
4. The Hall element is used for measuring an air gap magnetic field, the tension sensor is used for directly measuring the suspension suction force, the calculated suspension suction force and the directly measured suspension suction force are mutually corrected, more accurate suspension suction force real-time data are obtained, and the accuracy and the reliability of the test are improved.
5. The method comprises the steps of tightly attaching a plurality of Hall elements distributed in a matrix to a polar plate of a suspension electromagnet module, carrying out multi-scale discrete wavelet analysis on measurement data of the Hall elements to form fitting magnetic field data, calculating the suspension attraction of the suspension electromagnet module by combining a suction calculation formula according to the formed fitting magnetic field data, improving calculation accuracy, and ensuring that the calculated suspension attraction is closer to the directly measured suspension attraction, so that the accuracy of a corresponding relation curve of an air gap magnetic field and the suspension attraction is improved, and the influence of steel rail eddy on the suspension electromagnet attraction is accurately and effectively reflected in a test process.
6. The rotating speed of the rotary table is adjusted to enable the air gap magnetic field between the rotary table and the suspension electromagnet module to change, the vertical gap between the rotary table and the suspension electromagnet module is adjusted, and the air gap width can be adjusted, so that the corresponding relation curve of a plurality of air gap magnetic fields and suspension suction force and the corresponding relation change of the air gap magnetic fields and the suspension suction force under different air gaps are obtained, the test condition is closer to the running condition of a suspension train, and the simulation precision of the test is improved.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnet eddy current testing device of the present invention.
Detailed Description
An embodiment of the present invention will be described in detail with reference to fig. 1.
Electromagnet eddy current testing device, including suspension electromagnet module 1, its characterized in that: the device comprises a suspension electromagnet module 1, a support 2 for mounting the suspension electromagnet module 1, a rotary table 3 supported on the support 2 and positioned above the suspension electromagnet module 1, a driving assembly 4 for driving the rotary table 3 to rotate, a Hall element arranged on the suspension electromagnet module 1 and used for measuring an air gap magnetic field, and a tension sensor arranged on the suspension electromagnet module 1 and used for measuring suspension suction, wherein the rotary table 3 is horizontally arranged and rotates along with the driving of the driving assembly 4, so that eddy current is induced by the relative motion of the suspension electromagnet module 1 and the rotary table 3.
The electromagnet eddy current testing device is characterized in that the suspension electromagnet module 1 is installed on the support 2, the turntable 3 is located above the suspension electromagnet module 1 and rotates along with the driving of the driving assembly 4, so that eddy current is induced by the relative motion of the suspension electromagnet module 1 and the turntable 3 to form a dynamic air gap magnetic field, the relative motion of the suspension electromagnet and an F rail is simulated when a magnetic suspension train runs in a running mode of the turntable 3, and namely, the influence of the steel rail eddy current on the suspension attraction of the suspension electromagnet is verified by using a miniaturized testing device. The speed that changes carousel 3 makes the air gap magnetic field change, adjusts the vertical clearance between suspension electromagnetic module 1 and the carousel 3, can obtain different air gaps, and the vertical clearance of carousel 3 between suspension electromagnetic module 1 and carousel 3 is fixed in the transportation when needing to explain, can adjust the clearance between the two according to the test demand before carousel 3 transports.
The support 2 comprises a support base 21 and an installation arm 22 fixed on the support base 21, the suspension electromagnet module 1 is arranged on the installation arm 22, the turntable 3 is coaxially supported on the support base 21, and the driving assembly 4 is arranged in the support base 21 and is in transmission connection with the turntable 3. The mounting arm 22 supports and positions the suspension electromagnet module 1, so that the suspension electromagnet module 1 is kept still in the rotating process of the rotary table 3, the vertical gap between the suspension electromagnet module 1 and the rotary table 3 is not changed, and the relative operation mode of the suspension electromagnet and the F rail is equal to the relative operation mode of the suspension electromagnet and the F rail when a maglev train operates
The mounting arm 22 is inclined and L-shaped, the lower end of the mounting arm is fixed to the support base 21, and the upper end of the mounting arm is connected to the suspension electromagnet module 1, so that the suspension electromagnet module 1 is arranged on the periphery of the support base 21 and below the turntable 3.
Suspension electromagnet module 1 be with 3 coaxial circular-arc and quantity be two of carousel, every suspension electromagnet module 1 all is connected with two installation arms 22, suspension electromagnet module 1's tip respectively with install the arm 22 upper end and be connected, two suspension electromagnet module 1 are at supporting seat 21 periphery symmetric distribution. Two suspension electromagnet modules 1 are symmetrically distributed below the rotary table 3, and the two suspension electromagnet modules 1 are coaxially arranged with the rotary table 1 and are the same as the distribution positions of suspension electromagnets and an F rail of a magnetic suspension train, so that the reliability of a simulation test is improved.
Wherein, the supporting seat 21 on be equipped with the coaxial footstep bearing 23 of carousel 3, carousel 3 supports on footstep bearing 23, drives footstep bearing 23 synchronous revolution when carousel 3 rotates, offsets the influence of the axial suction between carousel 3 and the suspension electromagnet module 1 to the carousel pivoted through footstep bearing 23, guarantees the slew velocity of carousel 3.
The driving assembly 4 comprises a motor 41 arranged in the supporting seat 21 and a connecting shaft 42 coaxially connected with an output shaft of the motor 41, the connecting shaft 42 is arranged in the supporting seat 21 along the central axis of the turntable 3, and the connecting shaft 42 is coaxially connected with the turntable 3 through a radial bearing so as to drive the turntable 3 to rotate. The motor 41 drives the connecting shaft 42 to rotate, the rotating disc 3 is driven to rotate through the connecting shaft 42, the influence of radial suction between the rotating disc 3 and the suspension electromagnet module 1 on the rotation of the rotating disc 3 is offset through the radial bearing, and the running reliability of the whole testing device is improved.
The Hall elements are three-dimensional Hall magnetic sensors, are in patch shapes and are tightly attached to the surface of the polar plate of the suspension electromagnet module 1, and are distributed on the surface of the polar plate of the suspension electromagnet module 1 in a matrix manner. The method comprises the steps of carrying out multi-scale discrete wavelet analysis on measurement data of a plurality of Hall elements to form fitting magnetic field data, then calculating the suspension attraction of a suspension electromagnet module by combining the formed fitting magnetic field data and a suction calculation formula, improving calculation accuracy, and ensuring that the calculated suspension attraction is closer to the directly measured suspension attraction, so that the accuracy of a corresponding relation curve of an air gap magnetic field and the suspension attraction is improved, and the influence of steel rail eddy current on the suspension electromagnet attraction is accurately and effectively reflected in a test process.
The invention also provides an electromagnet eddy current test method, which adopts the electromagnet eddy current test device for testing and is characterized in that: the rotary disc 3 is driven to rotate, eddy current is induced between the rotary disc 3 and the suspension electromagnet module 1, a dynamic air gap magnetic field is formed, the air gap magnetic field is measured through the Hall element, the suspension attraction of the suspension electromagnet module 1 is calculated according to air gap magnetic field data, the suspension attraction of the suspension electromagnet module 1 is directly measured through the tension sensor, the calculated suspension attraction and the directly measured suspension attraction are mutually corrected, and a corresponding relation curve of the air gap magnetic field and the suspension attraction is obtained. The method comprises the steps of measuring an air gap magnetic field formed between a rotary table 3 and a suspension electromagnet module 1 by using a Hall element, calculating the magnitude of suspension attraction by using the relation between air gap magnetic field data and the suspension attraction, directly measuring the suspension attraction of the suspension electromagnet module 1 by using a tension sensor, mutually correcting the calculated suspension attraction and the directly measured suspension attraction to obtain a corresponding relation curve of the air gap magnetic field and the suspension attraction, reflecting the influence of steel rail eddy current on the suspension electromagnet attraction by using a real-time curve graph, and providing data reference for the design of the suspension electromagnet.
The step of calculating the levitation attraction of the levitation electromagnet module 1 according to the air gap magnetic field data refers to performing multi-scale discrete wavelet analysis on the measurement data of the hall elements distributed in a matrix to form fitting magnetic field data, and then calculating the levitation attraction of the levitation electromagnet module 1 by combining the formed fitting magnetic field data with an attraction calculation formula. The method comprises the steps of carrying out multi-scale discrete wavelet analysis on measurement data of a plurality of Hall elements to form fitting magnetic field data, then calculating the suspension attraction of a suspension electromagnet module by combining the formed fitting magnetic field data and a suction calculation formula, improving calculation accuracy, and ensuring that the calculated suspension attraction is closer to the directly measured suspension attraction, so that the accuracy of a corresponding relation curve of an air gap magnetic field and the suspension attraction is improved, and the influence of steel rail eddy current on the suspension electromagnet attraction is accurately and effectively reflected in a test process.
The speed of the rotary table 3 is adjusted, eddy current formed between the rotary table 3 and the suspension electromagnet module 1 is changed, the air gap magnetic field is changed, a plurality of corresponding relation curves of the air gap magnetic field and the suspension attraction force are obtained, and/or the vertical gap between the rotary table 3 and the suspension electromagnet module 1 is adjusted, and the corresponding relation change of the air gap magnetic field and the suspension attraction force under different air gaps is obtained. The rotating speed of the rotary table 3 is adjusted to enable the air gap magnetic field between the rotary table and the suspension electromagnet module to change, the air gap width can be adjusted by adjusting the vertical gap between the rotary table 3 and the suspension electromagnet module 1, so that the corresponding relation curve of a plurality of air gap magnetic fields and suspension suction and the corresponding relation change of the air gap magnetic fields and the suspension suction under different air gaps are obtained, the test condition is closer to the running condition of a suspension train, and the simulation precision of the test is improved.
The technical solutions of the embodiments of the present invention are fully described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Claims (10)
1. Electromagnet eddy current testing device, including suspension electromagnet module (1), its characterized in that: the device is characterized by further comprising a support (2) for mounting the suspension electromagnet module (1), a rotary table (3) which is supported on the support (2) and is positioned above the suspension electromagnet module (1), a driving assembly (4) for driving the rotary table (3) to rotate, a Hall element which is arranged on the suspension electromagnet module (1) and is used for measuring an air gap magnetic field, and a tension sensor which is arranged on the suspension electromagnet module (1) and is used for measuring suspension suction, wherein the rotary table (3) is horizontally arranged and rotates along with the driving of the driving assembly (4), so that eddy current is induced by the relative motion of the suspension electromagnet module (1) and the rotary table (3).
2. An electromagnet eddy current testing apparatus as defined in claim 1 wherein: the support (2) include supporting seat (21) and fix installation arm (22) on supporting seat (21), suspension electromagnet module (1) dress is on installation arm (22), carousel (3) coaxial support is on supporting seat (21), drive assembly (4) dress in supporting seat (21) and with carousel (3) transmission connection.
3. An electromagnet eddy current testing apparatus as defined in claim 2 wherein: the installation arm (22) be the L style of calligraphy that the slope set up, the lower extreme is fixed with supporting seat (21), the upper end is connected with suspension electromagnet module (1), make suspension electromagnet module (1) set up in supporting seat (21) periphery and be located carousel (3) below.
4. An electromagnet eddy current testing apparatus as defined in claim 3 wherein: suspension electromagnet module (1) be with carousel (3) coaxial circular-arc and quantity be two, every suspension electromagnet module (1) all is connected with two installation arms (22), the tip of suspension electromagnet module (1) respectively with install arm (22) upper end and be connected, two suspension electromagnet modules (1) are in supporting seat (21) periphery symmetric distribution.
5. An electromagnet eddy current testing apparatus as defined in claim 4 wherein: the supporting seat (21) is provided with a thrust bearing (23) which is coaxial with the turntable (3), the turntable (3) is supported on the thrust bearing (23), and the thrust bearing (23) is driven to synchronously rotate when the turntable (3) rotates.
6. An electromagnet eddy current testing apparatus as defined in claim 2 wherein: drive assembly (4) including dress motor (41) in supporting seat (21) and with motor (41) output shaft coaxial coupling's connecting axle (42), connecting axle (42) set up in supporting seat (21) along carousel (3) axis, connecting axle (42) pass through journal bearing and carousel (3) coaxial coupling to drive carousel (3) and rotate.
7. The electromagnet eddy current testing device according to claim 2, wherein the Hall elements are three-dimensional Hall magnetic sensors, are in patch shapes and are tightly attached to the surface of the polar plate of the suspension electromagnet module (1), and are distributed in a matrix on the surface of the polar plate of the suspension electromagnet module (1).
8. An electromagnet eddy current test method using the electromagnet eddy current test apparatus according to any one of claims 1 to 7, characterized in that: the method comprises the steps of driving a rotary table (3) to rotate, inducing eddy currents between the rotary table (3) and a suspension electromagnet module (1) to form a dynamic air gap magnetic field, measuring the air gap magnetic field through a Hall element, calculating suspension attraction of the suspension electromagnet module (1) according to air gap magnetic field data, directly measuring the suspension attraction of the suspension electromagnet module (1) through a tension sensor, mutually correcting the calculated suspension attraction and the directly measured suspension attraction, and obtaining a corresponding relation curve of the air gap magnetic field and the suspension attraction.
9. An electromagnet eddy current testing method as defined in claim 8 wherein: the method for calculating the suspension attraction of the suspension electromagnet module (1) according to the air gap magnetic field data comprises the steps of carrying out multi-scale discrete wavelet analysis on measurement data of a plurality of Hall elements distributed in a matrix to form fitting magnetic field data, and calculating the suspension attraction of the suspension electromagnet module (1) by combining the formed fitting magnetic field data with an attraction calculation formula.
10. An electromagnet eddy current testing method as defined in claim 8 wherein: and adjusting the speed of the rotary table (3), changing the eddy current formed between the rotary table (3) and the suspension electromagnet module (1), changing the air gap magnetic field to obtain a plurality of corresponding relation curves of the air gap magnetic field and the suspension attraction force and/or adjusting the vertical gap between the rotary table (3) and the suspension electromagnet module (1) to obtain the corresponding relation changes of the air gap magnetic field and the suspension attraction force under different air gaps.
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|---|---|
| CN112630708B (en) | 2022-09-23 |
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