CN111999688B - Single-chip laminated core leakage magnetic flux measuring device - Google Patents

Abstract

The invention relates to a device for measuring leakage magnetic flux of a monolithic laminated core. The measuring device comprises a device base, a fixed base of the immovable pole head, a fixed platform of the movable pole head, the immovable pole head and the movable pole head; the bottom of the fixed pole head fixing seat is fixed at one end of the base; the long end of the immovable pole head penetrates through the jack and is fixed on the inner wall of the immovable pole head fixing seat, and the end pole head of the short end of the immovable pole head 4 is wound with an excitation winding; one end of the movable pole head fixing table is fixed on the lower part of the inner wall of the fixed pole head fixing seat; the movable pole head is embedded in the groove of the movable pole head fixing table; the pole head at the vertical end of the movable pole head is vertically opposite to the pole head at the end part of the fixed pole head. The device can realize the diversity of the measured samples, including the shapes and the lengths of the samples and the types of the magnetic materials for manufacturing the samples, and the extra work that corresponding different clamps need to be customized for different samples is avoided.

Description

A single-chip lamination core leakage flux measurement device

technical field

The invention relates to the measurement of magnetic properties in magnetic material laminations under leakage flux, in particular to a single-chip-level measuring device for vertical magnetic flux leakage in laminations made of different magnetic materials.

Background technique

The iron cores of many electromagnetic devices such as transformers and inductors are made of various magnetic materials, especially materials with high magnetic permeability such as silicon steel sheets, amorphous and nanocrystalline, etc., because the iron cores are all laminated by magnetic materials It is wound in one layer. Under actual working conditions, especially in the iron core with an air gap, part of the magnetic flux will pass through the iron core perpendicular to the lamination direction, forming edge magnetic flux and generating eddy current in its direction, adding Increased core loss. Therefore, it is of great significance to study the number and characteristics of the leakage flux vertically passing through the laminations of the iron core. At present, there is still insufficient research on the penetration depth of the vertical magnetic flux in the leakage flux through the iron core. There is no corresponding measurement device for the formation of fringe magnetic flux and the eddy current loss caused by it, which causes designers to design transformers and other electrical equipment. The influence of fringe flux cannot be effectively considered, and there is a lack of corresponding data reference and characteristic research. Therefore, this patent proposes a new leakage flux measurement device suitable for various magnetic materials. Zhang Junjie from North China Electric Power University published a paper entitled "Simulation Experiment and Simulation of Leakage Flux and Additional Loss Entering Silicon Steel Laminations", which introduced the use of simulation experiments to measure the leakage flux entering silicon steel laminations and carried out Loss analysis and modeling, the measurement model is mainly composed of the improved M1 and M2 models, which mainly measure the leakage flux of silicon steel sheets, and there are deficiencies that other soft magnetic materials cannot be measured and the influence of air gaps has not been eliminated.

Contents of the invention

The object of the present invention is to provide a single-chip lamination core leakage flux measurement device for the deficiencies of the prior art. In this device, through the mutual cooperation between the gear and the threaded slider, the lower pole head moves up and down, so that the position of the lower pole head can be changed, and the change can be accurate to 1mm; the sample holder passes through four threaded support rods and The mutual cooperation of the nuts can realize its continuous adjustment and change the distance between the sample and the upper and lower pole heads. At the same time, the length of the sample shell that fixes the sample is also continuously adjustable, which can change the number of layers of the sample and the position of the sample.

Technical scheme of the present invention is:

A single-chip lamination core leakage flux measurement device, the measurement device includes a device base, a fixed pole fixed seat, a fixed pole fixed table, a fixed pole and a movable pole;

Wherein, the bottom of the fixed pole fixed seat is fixed on one end of the base; there is a jack on the inner top; the long end of the fixed pole in the shape of a half "mouth" passes through the jack and is fixed on the fixed pole fixed seat On the inner wall of the pole head, the pole head at the short end of the fixed pole head is wound with excitation windings; the lower half of the inner side of the fixed pole head is symmetrically opened with two parallel dovetail grooves on both sides of the built-in groove, each An up and down sliding rod is embedded in a dovetail slot; the mobile pole head fixing table is a block with a groove in the middle of the upper surface, parallel to the base, and two up and down sliding rods are fixed on one end; the shape is " The L”-shaped mobile pole head is embedded in the groove of the mobile pole head fixing table, and is fixed by the first fixed plate; the pole head at the vertical end of the mobile pole head is vertically opposite to the pole head at the end of the fixed pole head; the mobile pole head The top of the horizontal end of the pole head is fitted with a cuboid block of the same width, and the outside of the cuboid block is also fixed with a second fixed plate; on the side of the mobile pole head fixing platform away from the slide bar, move around the vertical end of the pole head , four through holes are punched symmetrically on both sides of the groove, in which four threaded rods are vertically penetrated, pass through the mobile pole head fixing table and go deep into the four corresponding holes in the base, and are fixed by nuts; at the same time , there are nuts to support and fix under the mobile pole head fixing table;

A sample holder is provided between the pole head of the moving pole head and the pole head of the fixed pole head, and the sample rack includes a sample base and a sample shell, wherein a groove is arranged in the middle of the sample base, and the sample is placed in the groove. The sample shell is set on the sample; there is a through hole at each of the four corners of the sample base, and 4 threaded support rods pass through the through hole, the upper part is fixed under the sample base with nuts, and the bottom end is screwed into the mobile head to fix it fixed in the hole on the platform;

The sample shell is composed of the same left and right vertical plates, and a shell in the shape of a "door" that covers the outside, and is clamped and fitted by bolts.

The fixed seat of the fixed pole head is an upright cuboid, the upper part of which has a thickness of 1-2 cm and a length of one-third to two-fifths; the top of the cut-off part is fixed by bolts There is a fixed pole fixed plate to form a socket, the bottom of the part is cut away, and the bottom end of the tripod is fixed, and the top of the tripod is connected with the bottom of the beam of the fixed pole to play a supporting role; the uncut part inside, There are two vertical dovetail grooves parallel to each other. There is also a vertical groove in the center of the top of the dovetail groove; there is a horizontal groove in the middle of the outer side of the fixed pole holder, and the horizontal groove and the inner dovetail groove There is a sliding positioning through hole at each of the two vertical intersections; in the horizontal groove in the middle of the outer side, a horizontal inserting rod is built in, and the inserting rod is located at the sliding positioning through hole, and a gear is installed on the inner side of each gear. Bearings, bearings are installed on the outside; the inner ring of the gear is provided with teeth, and the corresponding position of the insertion rod is also provided with teeth, and the teeth of the two mesh with each other; the gear is tangent to the thread slide bar, and the teeth on the outside of the gear and the thread The teeth on the slide bar are meshed with each other; a handle is installed on both sides of the plunger, which is located on the side of the fixed seat of the fixed pole, and is used to rotate the plunger;

The cross-section of the sliding rod is "I" shaped, the upper part is dovetail-shaped, and a groove is opened in the center of the top end for inlaying and fixing the threaded sliding bar.

The beneficial effects of the present invention are:

(1)) This device can realize the diversity of measurement samples, including the shape, length of the sample and the type of magnetic material made of the sample. At present, many devices can only measure samples of specific materials and shapes, such as Epstein square circles , and this patent can realize the measurement of different lengths and different types of samples, eliminating the need to customize the additional work of different fixtures for different samples.

(2) The position of the iron core and the distance between the upper and lower poles in the experiment are mostly fixed, and cannot be adjusted during the experiment, which causes great difficulties when measuring the iron core at different positions. Therefore, the design of this device allows the lower pole head to be continuously adjusted, the position of the lower pole head can be changed, the distance between the upper and lower pole heads can be changed, and the size of the air gap between the iron cores can be changed, which can save the need to change different positions when measuring different positions. The trouble of fixing the device, at the same time, the slider that controls the up and down movement of the lower pole head is engraved with a scale, which can realize precise adjustment, with an accuracy of 1mm.

(3) The commonly used experimental method in the experimental process is the single variable method. When measuring the leakage flux, it is necessary to keep the distance between the sample and the upper pole head constant. If it is fixed, it will not be possible to increase the number of sample layers. Maintain this condition, or the number of sample layers cannot be increased, so the sample holder is designed to be adjustable, so that the position of the sample and the upper pole head can be maintained; in addition, the distance between the sample and the pole head can also be changed. Measurement and comparative analysis.

(4) The sample case of the device is retractable. The device of the present invention mainly measures the number of layers of the sample in which the vertical magnetic flux in the leakage flux penetrates. Therefore, it is very important to change the number of sample layers. The sample case can be continuously adjusted. The thickness of sample laminates made of different materials is completely different, which can meet the requirements of different layers and different thicknesses.

(5) In the experiment, it is necessary to add a detection device to measure the required data, such as winding a coil on the surface of the sample to measure the magnetic induction density, but the introduction of the measurement device will introduce an air gap, which will cause a large space between the samples and affect the measurement results. Affect the accuracy of the experimental results, the present invention uses the PCB board as the measuring device, and at the same time dig holes inside the PCB board, place the measuring coil, and then make the PCB board into the same specification as the sample, so that it is close to the surface of the sample to achieve air-free Gap interference measurement can effectively avoid the influence of the introduced air gap on the measurement results, and can also achieve single-chip level measurement.

Description of drawings

Fig. 1 is the overall structural representation of device of the present invention;

Fig. 2 is a three-dimensional structural schematic diagram of another angle of the device of the present invention;

Fig. 3 is the partial structure schematic diagram of placing sample in the present invention;

Fig. 4 is the local structure schematic diagram of fixed pole head of the present invention;

Fig. 5 is a schematic diagram of the side partial structure of the fixed pole head device of the present invention;

Fig. 6 is an enlarged schematic diagram of the partial structure of adjusting the movement of the moving pole in the fixed pole of the present invention;

Fig. 7 is a schematic cross-sectional view of a local structure of adjusting the motion of the movable pole in the fixed pole of the present invention;

Fig. 8 is a schematic diagram of the local structure of the fixed mobile pole head device of the present invention;

Figure 9 is a schematic diagram of testing samples of different materials and different sizes and PCB boards;

Fig. 10 is the distribution diagram of the magnetic induction density on the surface of the sample laminate after adding excitation;

Fig. 11 is a distribution diagram of the magnetic induction intensity B on the center line of the nanocrystal laminate sample after excitation.

In the figure: 1. The base of the device; 2. The fixed seat of the fixed pole; 3. The fixed platform of the mobile pole; 4. The fixed pole; 5. The movable pole; 6. The excitation winding; 7. The sample; 8. The sample Fixed shell; 9. Threaded support rod; 10. Sample base; 11. Fixed block; 12. Fixed plate; 13. Fixed plate for fixed pole head; 14. Tripod; 1. Mobile pole head fixing plate; 18. Support rod; 19. Threaded slide bar; 20. Fixed nut; 21. Rotary gear; 22. Fixed small bearing; 23. Inserting rod; 24. Fixed bearing;

Detailed ways

Specific examples of the present invention are given below. The specific embodiments are only used to further describe the present invention in detail, and do not limit the protection scope of the claims of the present application.

The invention provides a device for simulating the leakage magnetic field in the actual working condition, and detects the vertical penetration depth of the leakage magnetic flux and the size of the horizontal magnetic flux when different samples are placed.

The single-chip laminated core leakage flux measurement device is shown in Figure 1, including a device base 1, a fixed pole head 2, a fixed pole fixed table 3, a fixed pole 4 and a movable pole 5 ;

Wherein, the fixed pole head holder 2 is an upright cuboid, and its bottom is fixed on one end of the base 1; , the fixed pole head fixed plate 13 is fixed by bolts to form a jack; the long end of the half-shaped "mouth"-shaped fixed pole head 4 passes through the jack and is embedded in the built-in groove, and the end of the short end of the fixed pole head 4 An excitation winding 6 is wound; two parallel dovetail grooves are symmetrically opened on both sides of the built-in groove on the lower half of the inner side of the fixed pole head holder 2, and a sliding rod 15 that moves up and down is embedded in each dovetail groove; The head fixing platform 3 is a block with a groove in the middle of the upper surface, parallel to the base 1, and two sliding rods 15 moving up and down are fixed at one end; the "L"-shaped moving pole head 5 in the shape of falling down is embedded in the In the groove of mobile pole head fixing table 3, and fixed plate 17 is fixed; The pole head of the vertical end of mobile pole head 5 is vertically opposite (projection overlaps) with the end pole head of motionless pole head 4; The top of the horizontal end is fitted with a cuboid block 11 of the same width (the vertical end of the mobile pole head 5 is higher than the cuboid block 11 by about 3 to 5 centimeters), and the outside of the cuboid block 11 is also fixed with a fixed plate 12; Move pole head fixing table 3 away from the side of slide bar 15, move around the vertical end of pole head 5, respectively punch four through holes symmetrically on both sides of the groove, wherein vertically penetrate into four threaded rods 18, always Go deep into the four holes corresponding to the position in the base 1 parallel to the mobile pole head fixing table 3, and fix it in the base 1 with nuts; as shown in Figure 1, on the 4 threaded rods 18, there are 8 in total Nut, the 4 nuts of the bottom fix the threaded rod 18 on the base 1;

Wherein, the fixed pole head fixing seat 2 plays the role of fixing the pole head 4, and the built-in gear in the plate is to be able to manually adjust the position of the mobile pole head fixing table 3. By rotating the gear, the slide bar 15 is driven to move up and down. Simultaneously, the top half of the pole head holder 2 symmetrically cuts off a part on both sides of the pole head groove to have space for the slide bar 15 to move upward without obstacles; the tripod 14 plays the role of supporting the pole head 4 , use a nut to fix one end of the tripod on the fixed pole head holder 2. Slide bar 15 is fixed together with one end of mobile pole head fixed table 3, slide bar 15 is vertically embedded in mobile pole head fixed table 3, because mobile slide bar 15 is movable, it is fixed with mobile pole head fixed table 3 Together, drive the mobile pole head fixing table 3 to move together.

The mobile pole head fixed table 3 plays the role of supporting and fixing the mobile pole head 5, the stopper 11 and the fixed plate 12 play the effect of making the mobile pole head 5 close to the surface of the stationary pole head 4, and the threaded rod 18 plays a support and The function of moving the pole head fixing table 3.

Between the pole head of the moving pole head 5 and the pole head of the stationary pole head 4, a sample holder is provided, as shown in Figure 3, the sample holder includes a sample base 10 and a sample shell 8, wherein, the middle part of the sample base 10 has a concave The groove is used to place the sample. The sample shell 8 is vertically placed in the groove of the sample base 10, and is close to the groove walls on both sides to form a "mouth"-shaped shell that is hollow on both sides; the four corners of the sample base 10 are respectively provided with A through hole, four threaded support rods 9 pass through the through hole, the upper part uses a nut to fix the sample base under the sample base 10, and goes deep into the hole at the corresponding position of the mobile pole head fixing table 3 parallel to the sample holder , and fixed on the mobile head console 3.

In addition, as shown in Figure 3, the sample shell 8 is made up of the same left and right two vertical plates, and a shell in the shape of a "door" (i.e. left, right, upper three parts), The vertical plate has a dovetail groove, and the raised ribs inside the shell are inserted into the dovetail groove to make the vertical plate and the shell fit together; at the same time, two through holes are punched in the middle of the upper side of the vertical plate, and the through holes correspond to the side of the shell There are up and down through grooves on the top, the bolts penetrate into the plate vertically, and pass through the outer shell, and are fixed with nuts, which play the role of making the outer shell and the vertical plate close to each other, and the shell opens The slot is for the purpose of adjusting the overall height of the sample case 8 . The sample base plays the role of supporting the sample to move up and down, the support rod 9 plays the role of supporting the sample rack, and the threads and nuts on the support rod play the role of adjusting the height of the sample base, and the sample shell 8 plays the role of adjusting the number of layers of the sample placed. effect.

The structure of the fixed pole head holder 2 described in Fig. 5, Fig. 6, and Fig. 7 shows that the upper part of its inner side has been cut away with a thickness of 1 to 2 cm and a part with a length of 1/3; The top is fixed with a fixed pole head fixing plate 13 by bolts to form a jack, the bottom of the part is cut off, and the bottom end of the tripod 14 (that is, two parallel slanting rods and a supporting plate at the top, in the shape of a door) is fixed, the tripod The top supporting plate of the top is connected with the bottom of the beam of the fixed pole head 4, which plays a supporting role; the uncut part of the inner side has two vertical dovetail grooves parallel to each other, (for fixing the slide bar 15), In the center of the dovetail groove top (the inner part of the fixed pole head holder 2), there is also a vertical groove for accommodating the threaded slide bar 19 on the slide bar 15; There is a horizontal groove, and the two vertical intersections of the horizontal groove and the inner dovetail groove have a sliding positioning through hole; in the horizontal groove in the middle of the outer side, there is a built-in horizontal insertion rod 23, and the insertion rod 23 is located at the sliding positioning through hole. A gear 21 is respectively installed, and the inner side of each gear 21 is equipped with a bearing 24, and the outer side is equipped with a bearing 22; the inner ring of the gear 21 is provided with teeth, and the corresponding position of the insertion rod 23 is also provided with teeth. The teeth mesh with each other; the gear 21 is tangent to the threaded slide bar 19, and the teeth on the outer side of the gear 21 and the teeth on the threaded slide bar 19 are meshed with each other; a handle 16 is respectively installed on both sides of the insertion rod 23, and is located at the fixed pole. The side of the head holder 2 is used to rotate the insertion rod 23;

Described slide bar 15 is as shown in Figure 8, and its cross section is " I " shape (matching with the groove inside fixed pole head holder 2), and the upper part is dovetail shape; Fixed thread slide bar 19;

Fig. 7 is a schematic cross-sectional view of the local structure of the fixed pole head holder 2 about the gear. It can be seen from the figure that the part where the gear is placed and the front of the fixed pole head holder 2 are slotted (here is the dovetail). The part of the slot) is opened; in Fig. 4, there is the slotting situation in front of the fixed pole head holder 2, which is placed on both sides of the fixed pole head.

The threaded slide bar 19 is embedded in the groove of the slide bar 15, and is fixed together with the slide bar 15 by countersunk head bolts, as shown in Figure 8, the threaded slide bar 19 and the slide bar 15 are fixed on the mobile pole head by countersunk head bolts The ends of the fixed table 3 are connected as a whole. In view of the actual situation, the two sliding rods 15 may not move the fixed table 3, so four threaded rods and nuts are provided on the other side of the fixed table 3 to play a supporting and moving role.

The handle 16 and the insertion rod 23 are fixed together by bolts. When the handle is turned, it can drive the gear to rotate, so that the threaded slide bar moves up and down, and the threaded slide bar drives the slide bar 15 to move, and the slide bar is vertically embedded in the groove of the mobile pole head fixing table 3 Therefore, the mobile pole head fixing table 3 moves up and down thereupon.

The fixed pole head holder 2 is embedded in the device base 1 and fixed together to form the main body of the device. The fixed pole head holder 2 securely fixes the pole head 4 with the fixed pole head fixing plate 13. Firmly fixed in the groove in the middle of the fixed pole head 2, the tripod 14 plays a role in supporting the fixed pole head 4 so that it will not tilt or fall off due to gravity.

Moving up and down the slide bar 15 and the threaded slide bar 19 are fixed together for the purpose of moving up and down. Grooving on the other side of the stationary pole head holder 2 puts the rotating gear and fixes two bearings 22 and 24 of the size of its two ends, and accepts it with an insertion rod 23, and the two ends of the rod 23 are respectively connected with two handles of the same size , and fixed with bolts, it is convenient for the user to adjust up and down, and at the same time, the slide bar 15 is engraved with a scale with an accuracy of 1mm, which is convenient for the user to adjust the size as required.

The slide bar 15 is embedded in the mobile pole head fixed table 3 and fixed together, so that the slide bar 15 can drive the fixed table 3 to move up and down, and at the same time install the base 1 and the mobile pole head fixed table 3 away from the slide bar 15 One end of one end is symmetrically embedded in four threaded support rods, and is fixed with nuts to play the role of supporting the mobile pole head fixing table 3 and moving up and down with it. The mobile pole head 5 is placed in the groove of the mobile pole head fixing table 3, and is fixed with the mobile pole head fixed plate 17 and the nut, and at the same time, the end of the mobile pole head away from the slide bar 15 is fixed by a fixed block 11 and a fixed plate 12. The moving pole head 5 and the stationary pole head 4 are closely attached to reduce the leakage magnetic flux here and form a closed magnetic circuit.

Put the sample 7 and the detection coil in the sample shell 8 and the sample base 10 to simulate the iron core lamination in the actual transformer or inductor, and use four threaded support rods 9 to distribute symmetrically around the sample base to support the sample base , and embedded in the mobile pole head fixing table 3 to achieve the role of support, and use nuts to fix and adjust the height of the sample base to achieve the purpose of adjusting the distance between the sample and the fixed pole head. At the same time, the sample shell 8 can be stretched and retracted. The two sides of the sample shell 8 are slotted to facilitate sliding up and down. The height of the shell can be adjusted.

Principle of work and work flow of the present invention are:

After the device is installed and fixed according to Figure 1, the excitation winding 6 is wound on the fixed pole head 4, and the sample 7 is fixed in the sample test bench composed of the sample fixing shell 8, the sample base 10 and the threaded support rod 9, and the excitation winding 6 Apply current to make it generate a magnetic field, the fixed pole 4, air, the sample test bench, and the movable pole 5 form a closed magnetic circuit, the handle 16 is turned to adjust the distance between the fixed pole 4 and the movable pole 5, and the nut is rotated Adjust the distance between the sample and the fixed pole head 4, energize the excitation winding 6 to simulate the leakage magnetic field, and use the detection coil to detect and record the magnetic flux density on the surface of each sample.

For laminations made of different magnetic materials, different measurement methods are adopted according to their structural characteristics. For silicon steel sheets, the laminations are thicker and stronger. When making samples, they can be selectively manufactured according to different measurement purposes. into different shapes. At the same time, a single piece of sample plus a PCB test board is used for measurement, that is, a layer of PCB test board and a layer of silicon steel sheet are tightly laminated together for single-chip measurement; for nanocrystalline materials, due to their thinner and brittle laminations, the When making it into a cuboid and holding it with a PCB board of the same specification, the PCB detection board is too thick for its single-layer laminate, which is equivalent to introducing an air gap of considerable thickness, which is easy to make the detection result inaccurate. Therefore, several Layers of nanocrystals are stacked together and a layer of PCB detection board is stacked for measurement. The sample holder is made to have two sides that are empty, so that cuboids of different lengths can be placed, and even the length of the sample piece can extend out of the sample holder.

The test sample is 9 pieces, the width is 0.8mm, the thickness is 0.02mm, and the distance between the samples is 0.02mm. The coil is Litz wire, the number of turns is 5 turns, and the material of the pole head is steel-1008.

Figure 10 is a schematic diagram of the simulation of the magnetic field lines in the pole head and the 9-layer nanocrystalline lamination after the excitation is applied at a frequency of 20khz. , only a part will pass through the nanocrystalline stack vertically, and a large part will bypass the stack or diffuse outward from the surface of the stack, and return to the lower head from the edge of the stack. It can be seen that there is vertical magnetic flux penetration in each layer of nanocrystalline laminations. As the number of laminations increases, the vertical magnetic flux becomes smaller and smaller. This phenomenon is in line with the fact that under actual working conditions, the edge In the case of the magnetic flux passing through the core laminations vertically, it is of great significance for magnetic shielding and calculation of eddy current loss to study the several layers of the edge magnetic flux vertically passing through the core laminations in the actual working condition.

Figure 11 shows the distribution of the magnetic induction density B on the neutral line between the sample and the pole head. The abscissa is the position of the sample between the poles, and the ordinate is the distribution of the vertical magnetic induction density on the surface of the sample. It can be seen from the figure that the B inside the upper pole is very large, and it drops rapidly at the interface between the pole and the air. It remains stable in the air, but B drops rapidly after entering the sample. This is because under the action of the external magnetic field, the magnetic flux and eddy current are induced inside the sample, which generates a magnetic field opposite to the direction of the external magnetic field, and "pulls" the external magnetic field back. Make most of the magnetic flux dissipate to its horizontal direction, so the vertical magnetic flux penetrates less. Similarly, the vertical magnetic flux in the subsequent samples decreases successively, which is in line with the actual situation. Near the lower pole head, the air and the sample The magnetic flux passing through the core gathers together and returns to the iron core magnetic circuit. This device mainly studies the number of layers that the vertical magnetic flux penetrates into the sample lamination in the external magnetic field. From the simulation results, this device is in line with the actual situation in terms of simulating the distribution of the leakage magnetic flux and the penetration of the sample lamination under actual working conditions. The trend of the magnetic induction density in the sample laminations is reasonable, which is meaningful for the study of the magnetic circuit conditions and laws of the edge magnetic flux near the air gap of the iron core laminations in electrical equipment such as transformers, as well as the research on the losses caused by them.

What is not mentioned in the present invention is applicable to the prior art.

Claims (4)

1. A single-chip laminated iron core leakage flux measuring device, characterized in that the measuring device includes a device base, a fixed pole fixed seat, a fixed pole fixed table, a fixed pole and a movable pole; Wherein, the bottom of the fixed pole fixed seat is fixed on one end of the base; there is a jack on the inner top; the long end of the fixed pole in the shape of a half "mouth" passes through the jack and is fixed on the fixed pole fixed seat On the inner wall of the pole head, the pole head at the short end of the fixed pole head is wound with excitation windings; the lower half of the inner side of the fixed pole head is symmetrically opened with two parallel dovetail grooves on both sides of the built-in groove, each An up and down sliding rod is embedded in a dovetail slot; the mobile pole head fixing table is a block with a groove in the middle of the upper surface, parallel to the base, and two up and down sliding rods are fixed on one end; the shape is " The L”-shaped mobile pole head is embedded in the groove of the mobile pole head fixing table, and is fixed by the first fixed plate; the pole head at the vertical end of the mobile pole head is vertically opposite to the pole head at the end of the fixed pole head; the mobile pole head The top of the horizontal end of the pole head is fitted with a cuboid block of the same width, and the outside of the cuboid block is also fixed with a second fixed plate; on the side of the mobile pole head fixing platform away from the slide bar, move around the vertical end of the pole head , four through holes are punched symmetrically on both sides of the groove, in which four threaded rods are vertically penetrated, pass through the mobile pole head fixing table and go deep into the four corresponding holes in the base, and are fixed by nuts; at the same time , there is a nut fixed under the mobile pole head fixing table; A sample holder is provided between the pole head of the moving pole head and the pole head of the fixed pole head, and the sample rack includes a sample base and a sample shell, wherein a groove is arranged in the middle of the sample base, and the sample is placed in the groove. The sample shell is set on the sample; there is a through hole at each of the four corners of the sample base, and 4 threaded support rods pass through the through hole, the upper part is fixed under the sample base with nuts, and the bottom end is screwed into the mobile head to fix it Fix in the hole on the table. 2. The single-piece laminated core leakage flux measurement device as claimed in claim 1, characterized in that the fixed pole head fixing seat is an upright cuboid, and the upper part of the inner side is cut off with a thickness of 1 to 2 cm. , The part whose length is one-third to two-fifths; the top of the part is cut off, and the fixed pole head fixing plate is fixed by bolts to form a socket; the bottom of the part is cut off, and the bottom end of the tripod is fixed, and the tripod The top is connected with the bottom of the beam of the fixed pole to play a supporting role; the uncut part of the inner side has two vertical dovetail grooves parallel to each other, and there is a vertical concave groove in the center of the top of the dovetail groove. There is a horizontal groove in the middle of the outer side of the stationary pole head holder, and a sliding positioning through hole is opened at the two vertical intersection points of the horizontal groove and the inner dovetail groove; in the horizontal groove of the outer middle part, there is a built-in horizontal insertion rod , the insertion rod is located at the sliding positioning through hole, each is equipped with a gear, the inner side of each gear is installed with a bearing, and the outer side is installed with a bearing; the inner ring of the gear is provided with teeth, and the corresponding position of the insertion rod is also provided with teeth. The teeth of the two mesh with each other; the gear is tangent to the threaded slider, and the teeth on the outer side of the gear and the teeth on the threaded slider mesh with each other; a handle is installed on both sides of the plunger, which is fixed on the fixed pole. The side of the seat is used to rotate the plunger. 3. The device for measuring leakage flux of a single-piece laminated iron core as claimed in claim 1, characterized in that the cross-section of the slide bar is "I"-shaped, the upper part is dovetail-shaped, and there is a groove in the center of the top end. Used to mount fixed threaded sliders. 4. The single-piece laminated iron core leakage flux measuring device as claimed in claim 1, characterized in that the sample case consists of the same left and right vertical plates, and a shape of The "door"-shaped shell is composed of bolts and clamped together.

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