阅读说明：本技术 一种电器元件内部条形永磁体截面磁通间接测量方法 (Indirect measuring method for magnetic flux of section of bar-shaped permanent magnet in electrical appliance element ) 是由 丁丁 由佳欣 田聪 主梦瞳 杜新帅 朱月霖 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种电器元件内部条形永磁体截面磁通间接测量方法,所述方法如下：S1：针对不同型号尺寸的条形永磁体,沿各充磁方向上,测量截面磁通作为参考1；S2：针对不同型号尺寸的条形永磁体,沿各充磁方向上,测量端面磁通作为参考2；S3：将参考1和2数据导入数据库；S4：对于某装配到电器元件当中的条形永磁体,测量端面磁通以及端部位置的部分截面磁通,作为实测数据；S5：将实测数据与参考1和参考2进行比对,选取数据最为相近的永磁体参考,同时获得参考1中对应型号永磁体的截面磁通数据,作为该条形永磁体的截面磁通。本发明为不破坏电磁机构就能测量永磁体截面磁通提供了可行方案。(The invention discloses an indirect measuring method for magnetic flux of a section of a bar permanent magnet in an electrical element, which comprises the following steps: s1: for bar-shaped permanent magnets of different types and sizes, measuring section magnetic flux along each magnetizing direction as reference 1; s2: measuring end face magnetic flux as reference 2 along each magnetizing direction for strip-shaped permanent magnets of different types and sizes; s3: importing the reference 1 and 2 data into a database; s4: measuring end face magnetic flux and partial cross section magnetic flux of the end part position of a certain strip-shaped permanent magnet assembled in an electrical appliance element as measured data; s5: and comparing the measured data with reference 1 and reference 2, selecting the permanent magnet reference with the most similar data, and simultaneously obtaining the section magnetic flux data of the permanent magnet with the corresponding model in reference 1 as the section magnetic flux of the strip-shaped permanent magnet. The invention provides a feasible scheme for measuring the section magnetic flux of the permanent magnet without damaging an electromagnetic mechanism.)

1. An indirect measuring method for magnetic flux of a section of a bar-shaped permanent magnet in an electrical element is characterized by comprising the following steps:

step S1: aiming at bar-shaped permanent magnets with different types and sizes, a permanent magnet section magnetic flux measuring device is utilized to select a plurality of sections along each magnetizing direction and measure the section magnetic flux of each section under the saturated magnetizing condition and different degrees of demagnetizing conditions as reference 1;

step S2: for bar-shaped permanent magnets of different types and sizes, measuring the end surface magnetic flux of each end surface of the permanent magnet under the condition of saturated magnetization and different degrees of demagnetization along each magnetizing direction by using a permanent magnet section magnetic flux measuring device as reference 2;

step S3: importing the data of reference 1 and reference 2 into a database as reference;

step S4: for a certain strip-shaped permanent magnet assembled in an electrical appliance element, measuring end face magnetic flux and partial section magnetic flux at the end position under the saturated magnetizing state and different degrees of demagnetization on the surface of the observable and measurable end part of the permanent magnet, wherein the cross section magnetic flux can be measured;

step S5: and comparing the measured data with reference 1 and reference 2 in a database, selecting the permanent magnet reference with the most similar data, and simultaneously obtaining the section magnetic flux data of the permanent magnet with the corresponding model in the reference 1 as the section magnetic flux of the strip-shaped permanent magnet.

2. The indirect measuring method for magnetic flux on cross section of bar permanent magnet inside electrical component of claim 1, wherein in step S3, the cross section magnetic flux data in reference 1 measured by the same bar permanent magnet should correspond to the surface magnetic flux data in reference 2.

3. The method according to claim 1, wherein in step S4, for an object to be measured with only end faces of the permanent magnets visible, it is necessary to measure end face magnetic fluxes of the observable end faces in a saturated magnetized state and different degrees of demagnetization by using a cross-sectional magnetic flux measuring device.

4. The method of indirectly measuring cross-sectional magnetic flux of a bar permanent magnet inside an electrical component of claim 1, wherein in step S4, for an object to be measured having an end portion of a permanent magnet exposed to the outside, cross-sectional magnetic flux at an end surface and an end portion of the object under saturation magnetization and different degrees of demagnetization are measured by a cross-sectional magnetic flux measuring device with which a plurality of cross-sections are selected at observable positions.

Technical Field

The invention relates to a method for measuring the magnetic property of a permanent magnet in a magnetic-flux electrical element, in particular to an indirect measurement method for the magnetic flux of the section of a strip permanent magnet in the electrical element.

Background

The electromagnetic system is an important component of the electromagnetic relay, and particularly for the electromagnetic relay containing permanent magnets, the performance of the permanent magnets determines the performance of the electromagnetic system, and further determines the performance of the whole relay, the determination of the performance state of the permanent magnets and the like, so that the reliability evaluation of the relay is very important.

At present, the magnetic flux of the section of the strip-shaped permanent magnet can be measured by using a Hall sensor and a magnetic flux coil. The cross-section magnetic flux is the basis of the calculation of the working point of the permanent magnet and marks the magnetic performance state of the permanent magnet; the cross-sectional magnetic flux can also be used for calculating or transversely comparing the static attractive force characteristics of the electromagnetic system of the electric appliance. Especially in the degradation process of the whole life cycle of the electric appliance, the test of the magnetic performance state of the permanent magnet in different time periods has important significance on the reliability of the electric appliance and even an electronic system.

However, for the bar-shaped permanent magnet which is already assembled in an electrical component such as a relay, only a part of the permanent magnet which can be observed and measured, even only the end face is exposed, and the cross-sectional magnetic flux at different positions in the permanent magnet cannot be measured by using the magnetic flux coil.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an indirect measuring method for the magnetic flux of the section of a bar-shaped permanent magnet in an electrical element.

The purpose of the invention is realized by the following technical scheme:

an indirect measuring method for magnetic flux of a section of a bar-shaped permanent magnet in an electrical element comprises the following steps:

step S1: aiming at bar-shaped permanent magnets with different types and sizes, a permanent magnet section magnetic flux measuring device is utilized to select a plurality of sections along each magnetizing direction and measure the section magnetic flux of each section under the saturated magnetizing condition and different degrees of demagnetizing conditions as reference 1;

step S2: for bar-shaped permanent magnets of different types and sizes, measuring the end surface magnetic flux of each end surface of the permanent magnet under the condition of saturated magnetization and different degrees of demagnetization along each magnetizing direction by using a permanent magnet section magnetic flux measuring device as reference 2;

step S3: importing the data of reference 1 and reference 2 into a database as reference;

step S4: for a certain strip-shaped permanent magnet assembled in an electrical appliance element, measuring end face magnetic flux and partial section magnetic flux at the end position under the saturated magnetizing state and different degrees of demagnetization on the surface of the observable and measurable end part of the permanent magnet, wherein the cross section magnetic flux can be measured;

step S5: and comparing the measured data with reference 1 and reference 2 in a database, selecting the permanent magnet reference with the most similar data, and simultaneously obtaining the section magnetic flux data of the permanent magnet with the corresponding model in the reference 1 as the section magnetic flux of the strip-shaped permanent magnet.

Compared with the prior art, the invention has the following advantages:

the invention provides a measuring mode aiming at the section magnetic fluxes of different positions of the bar-shaped permanent magnet in the electrical element, provides a feasible scheme for measuring the section magnetic fluxes of different sections of the permanent magnet without damaging an electromagnetic mechanism, and is convenient for determining the magnetic performance state of the bar-shaped permanent magnet in the electrical element and providing a basis for the subsequent calculation of the local working point of the permanent magnet.

Drawings

FIG. 1 is a flow chart of an indirect testing method for magnetic flux on the section of a bar permanent magnet according to the invention;

FIG. 2 is a schematic cross-sectional view of a bar-shaped permanent magnet tested along a magnetizing direction;

FIG. 3 is a schematic diagram of a magnetic flux testing mechanism for a bar permanent magnet section;

FIG. 4 shows only the end surface of the observable portion of the object;

FIG. 5 is a schematic view of magnetic flux measurement of the permanent magnet end face of a bridge polarized magnetic system of an electromagnetic relay of a certain type;

FIG. 6 shows an observable portion of an object including an end surface and a portion of an end portion;

FIG. 7 is a graph comparing measured data to reference data.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.

The invention provides an indirect measuring method for magnetic flux of a section of a bar-shaped permanent magnet in an electrical element, which comprises the following steps of:

step S1: and measuring the section magnetic fluxes at different positions aiming at the strip-shaped permanent magnets with different models and sizes.

As shown in fig. 2, a plurality of sections a are uniformly selected from each permanent magnet c along each magnetizing direction b, the permanent magnet c is placed on a slide block f by using a permanent magnet section magnetic flux measuring device such as that shown in fig. 3, the permanent magnet c slides on a guide rail d along a direction e to pass through a magnetic flux coil g, the section magnetic flux of each section (20 divided sections equally divided along the length direction) under the condition of saturated magnetizing (100% magnetizing) and different degrees of demagnetization (95% magnetizing and 90% magnetizing … 5% magnetizing) is measured, and data is collected and used as reference 1.

Step S2: and measuring the surface magnetic fluxes of different end surfaces aiming at the strip-shaped permanent magnets with different models and sizes.

With a permanent magnet cross-sectional magnetic flux measuring apparatus such as that shown in fig. 3, the surface magnetic flux of each end face in each magnetizing direction was measured in the case of saturation magnetization (100% magnetization) and in the case of different degrees of demagnetization (95% magnetization, 90% magnetization … 5% magnetization), and the data was collected as reference 2.

Step S3: the reference 1 and reference 2 data are imported into the database as a reference.

In this step, the cross-sectional flux data in reference 1 measured by the same bar permanent magnet should correspond to the surface flux data in reference 2.

Step S4: for a certain strip-shaped permanent magnet which needs to measure the cross-section magnetic flux to calculate a local working point and is assembled in an electrical element, end face magnetic flux in a saturated magnetizing (100% magnetizing) state and different degrees of demagnetization (95% magnetizing and 90% magnetizing … 5% magnetizing) and partial cross-section magnetic flux at an end position are measured on the surface of an observable and measurable end part and the end part of the permanent magnet which can be measured to measure the cross-section magnetic flux and is possibly exposed outside (as shown in figure 6, the cross-section magnetic flux is evenly divided on a permanent magnet h to be measured according to the length direction 20, 4 cross-sections k of the end part can be measured according to the extending part, and the measuring data can not be measured inwards).

In this step, for an object to be measured that can be observed only by the end face of the permanent magnet, as shown in fig. 4, it is necessary to measure the end face magnetic flux of the observable end face m by using a cross-section magnetic flux measuring device in a saturated magnetizing (100% magnetizing) state and in different degrees of demagnetization (95% magnetizing and 90% magnetizing … 5% magnetizing), taking a bridge-type polarized magnetic system of an electromagnetic relay of a certain model as an example, the position of a magnetic flux coil g is shown in fig. 5.

In this step, as shown in fig. 6, for an object to be measured having an end portion of a permanent magnet exposed to the outside, it is necessary to select a plurality of cross sections at observable positions and measure an end surface magnetic flux and a cross section magnetic flux at the end portion position in a saturated magnetized state (100% magnetized) and in demagnetized states of different degrees (95% magnetized and 90% magnetized … 5% magnetized).

Step S5: and comparing the measured data with reference 1 and reference 2 in the database one by one, selecting the permanent magnet reference with the most similar data, and acquiring the cross-section magnetic flux data of the permanent magnet of the corresponding type in the reference 1 in the database in a saturated magnetizing state to be used as the cross-section magnetic flux of the to-be-measured bar-shaped permanent magnet.

Example (b):

selecting 6 sections on the end part of a certain permanent magnet to be measured, exposing the permanent magnet to the outside, measuring the six sections and the section magnetic fluxes of the two end surfaces of the permanent magnet exposed to the outside in a saturated magnetizing (100% magnetizing) state and different degrees of demagnetization (95% magnetizing and 90% magnetizing … 5% magnetizing) by using a permanent magnet section magnetic flux measuring device, comparing the measuring result with a database, and selecting a group of reference data with approximate data. Fig. 7 shows the comparison result between the measured magnetic flux data of the end face and part of the end section of the permanent magnet to be measured under the 90% magnetizing condition and the data of a group of reference permanent magnets in the database, where the group of reference data can be used as the section magnetic flux of the permanent magnet to be measured.