CN111999688A - Single-chip laminated core leakage magnetic flux measuring device - Google Patents
Single-chip laminated core leakage magnetic flux measuring device Download PDFInfo
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- CN111999688A CN111999688A CN202010866336.1A CN202010866336A CN111999688A CN 111999688 A CN111999688 A CN 111999688A CN 202010866336 A CN202010866336 A CN 202010866336A CN 111999688 A CN111999688 A CN 111999688A
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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
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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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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 immobile pole head penetrates through the jack and is fixed on the inner wall of the immobile pole head fixing seat, and an excitation winding is wound on the pole head at the end part of the short end of the immobile pole head 4; 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
Technical Field
The invention relates to measurement of magnetic characteristics in a magnetic material lamination under leakage magnetic flux, in particular to a single-chip-level measurement device for performing vertical magnetic flux in leakage magnetic flux on laminations made of different magnetic materials.
Background
The iron cores of many electromagnetic devices such as transformers and inductors are made of various magnetic materials, especially materials with high magnetic conductivity such as silicon steel sheets, amorphous and nanocrystalline, and the like. Therefore, the research on the number and the characteristics of the leakage magnetic flux vertically penetrating through the iron core lamination layers is of great significance. At present, the research on the penetration depth of vertical magnetic flux in the leakage magnetic flux passing through an iron core is not enough, the edge magnetic flux is formed, eddy current loss caused by the edge magnetic flux is lack of a corresponding measuring device, so that a designer cannot effectively consider the influence of the edge magnetic flux when designing electrical equipment such as a transformer and the like, and corresponding data reference and characteristic research are also lacked, so that the patent provides a novel leakage magnetic flux measuring device suitable for various magnetic materials. The Zhanjie et al at North China Power university published a paper entitled "simulation experiment and simulation of leakage flux and additional loss into silicon steel laminations", which introduced that the leakage flux entering the silicon steel laminations was measured by the simulation experiment and loss analysis and modeling were performed, and the measurement model mainly consists of improved M1 and M2 models, mainly measures the leakage flux of the silicon steel laminations, and has the disadvantages that other soft magnetic materials cannot be measured and the influence of air gaps cannot be eliminated.
Disclosure of Invention
The invention aims to provide a device for measuring leakage magnetic flux of a monolithic laminated core, aiming at overcoming the defects of the prior art. In the device, the lower pole head is driven to move up and down through the mutual matching of the gear and the thread sliding strip, so that the position of the lower pole head can be changed and can be accurately changed to 1 mm; the sample frame can realize continuous adjustment through the mutual matching of the four threaded support rods and the nuts, the distance between a sample and the upper and lower pole heads is changed, meanwhile, the length of the sample shell for fixing the sample is also continuously adjustable, and the number of layers for placing the sample and the position of the sample can be changed.
The technical scheme of the invention is as follows:
a measuring device for leakage magnetic flux of a monolithic laminated core comprises a device base, a fixed stationary pole head seat, a movable pole head fixed table, a stationary pole head and a movable pole head;
the bottom of the fixed pole head fixing seat is fixed at one end of the base; the top of the inner side is provided with a jack; the long end of the semi-square-shaped immobile pole head penetrates through the jack and is fixed on the inner wall of the immobile pole head fixing seat, and an excitation winding is wound on the pole head at the end part of the short end of the immobile pole head; the lower half part of the inner side of the fixed seat of the fixed pole head is symmetrically provided with two parallel dovetail grooves at two sides of the built-in groove, and a sliding rod moving up and down is embedded in each dovetail groove; the movable pole head fixing platform is a block body with a groove in the middle of the upper surface, is parallel to the base, and is fixed with two up-and-down moving slide bars at one end; the L-shaped movable pole head which is placed upside down is embedded in a groove of the movable pole head fixing table and is fixed by a first fixing plate; 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 top of the horizontal end of the movable pole head is attached with a cuboid baffle block with the same width, and a second fixing plate is fixed on the outer side of the cuboid baffle block; four through holes are symmetrically drilled on two sides of the groove respectively on the periphery of the vertical end of the movable pole head on one side of the movable pole head fixing table far away from the slide rod, wherein four threaded rods are vertically penetrated, penetrate through the movable pole head fixing table, penetrate into four holes corresponding to the positions in the base and are fixed through nuts; meanwhile, a nut is screwed below the movable pole head fixing table for supporting and fixing;
a sample rack is arranged between the pole head of the movable pole head and the pole head of the fixed pole head, and comprises a sample base and a sample shell, wherein a groove is formed in the middle of the sample base, a sample is placed in the groove, and the sample shell is sleeved on the sample; four corners of the sample base are respectively provided with a through hole, 4 threaded support rods pass through the through holes, the upper parts of the support rods are fixed below the sample base by nuts, and the bottom ends of the support rods are screwed into the holes on the movable pole head fixing table for fixing;
the sample shell consists of a left vertical plate, a right vertical plate and a shell which is sleeved outside the sample shell and is in a shape of a 'door', and the sample shell is clamped and attached through bolts.
The fixed pole head fixing seat is a vertical cuboid, and the upper part of the inner side of the fixed pole head fixing seat is cut off with a part with the thickness of 1-2 cm and the length of one third-two fifths; the top of the cut-away part is fixed with a fixed plate of the fixed pole head through a bolt to form a jack, the bottom of the cut-away part is fixed with the bottom end of a tripod, and the top end of the tripod is connected with the bottom of a beam of the fixed pole head to play a supporting role; the non-dissected part on the inner side is provided with two vertical dovetail grooves which are parallel to each other, and the center of the top of each dovetail groove is also provided with a vertical groove; the middle part of the outer side of the fixed seat of the fixed pole head is provided with a horizontal groove, and two vertical intersection points of a dovetail groove on the horizontal groove and the dovetail groove on the inner side are respectively provided with a sliding positioning through hole; a horizontal inserting rod is arranged in the horizontal groove in the middle of the outer side, the inserting rods are positioned at the sliding positioning through holes and are respectively provided with a gear, the inner side of each gear is provided with a bearing, and the outer side of each gear is provided with a bearing; the inner ring of the gear is provided with teeth, and the corresponding position of the inserted bar is also provided with teeth, and the teeth of the gear and the inserted bar are meshed with each other; the gear is tangent to the thread sliding strip, and teeth on the outer side of the gear and teeth on the thread sliding strip are meshed with each other; two handles are respectively arranged on two sides of the inserted rod, are positioned on the side part of the fixed pole head fixing seat and are used for rotating the inserted rod;
the cross section of the sliding rod is I-shaped, the upper part of the sliding rod is dovetail-shaped, and the center of the top end of the sliding rod is provided with a groove for embedding and fixing the threaded sliding strip.
The invention has the beneficial effects that:
(1) the device can realize the diversity of the measured samples, including the shapes and the lengths of the samples and the types of magnetic materials for manufacturing the samples, and at present, many devices can only measure specific materials and samples with specific shapes, such as Ebostan square rings, while the device can realize the measurement of samples with different lengths and different types, thereby avoiding the extra work of customizing corresponding different clamps for different samples.
(2) The position of the iron core in the experiment and the distance between the utmost point head about it are all fixed, all be all inegulablely in the experimentation, this causes very big difficulty when different positions to wanting to measure the iron core, consequently this device design lets down the utmost point head can continuous adjustment, can change the position of utmost point head down, the size of distance between utmost point head about the change, and then change the air gap size between the iron core, just can save the trouble that need trade different fixing device when measuring different positions, and simultaneously, be carved with the scale on the draw runner that the utmost point head reciprocated under the control, can realize accurate regulation, the accuracy reaches 1 mm.
(3) The common experimental method in the experimental process is a single variable method, and when the leakage magnetic flux is measured, the distance between the sample and the upper pole head needs to be kept unchanged, if the distance is fixed, the condition cannot be maintained when the number of sample layers is increased, or the number of sample layers cannot be increased, so that the sample frame is designed to be adjustable, and the positions of the sample and the upper pole head can be maintained unchanged; in addition, measurement and comparative analysis can be realized when the distance between the sample and the polar head is changed.
(4) The sample shell of the device can be stretched, the device mainly measures the number of the sample layers penetrated by the vertical magnetic flux in the leakage magnetic flux, so that the change of the number of the sample layers is crucial, the sample shell can be continuously adjusted, and the requirements of different layers and different thicknesses can be met in the face of completely different sample lamination thicknesses made of different materials.
(5) The invention adopts the PCB as the measuring device, simultaneously digs a hole in the PCB, places the measuring coil, then makes the PCB into the same specification with the sample, and leads the PCB to be tightly attached to the surface of the sample, thereby realizing the measurement without air-gap interference, effectively avoiding the influence of the introduced air gap on the measuring result, and also realizing the single-chip measurement.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic perspective view of another embodiment of the present invention;
FIG. 3 is a schematic view of a partial structure for placing a sample according to the present invention;
FIG. 4 is a partial schematic view of the stationary pole head of the present invention;
FIG. 5 is a schematic side view of a stationary pole head assembly according to the present invention;
FIG. 6 is an enlarged view of a portion of the fixed and fixed pole heads for adjusting the motion of the movable pole head according to the present invention;
FIG. 7 is a schematic sectional view of a partial structure for adjusting the motion of a movable pole head in a stationary pole head according to the present invention;
FIG. 8 is a schematic view of a partial structure of a fixed moving pole head device according to the present invention;
FIG. 9 is a schematic diagram of different sizes of samples and PCB inspection of different materials;
FIG. 10 is a graph of magnetic induction density distribution of the surface of a sample stack after excitation;
fig. 11 is a graph of magnetic induction B at the centerline of a sample of nanocrystalline laminations after excitation.
In the figure: 1. a device base; 2. a stationary pole head fixing seat; 3. moving the pole head fixing table; 4. the pole head is not moved; 5. moving the pole head; 6. exciting the winding; 7. a sample; 8. a sample holding case; 9. a threaded support rod; 10. a sample base; 11. fixing a stop block; 12. a fixing plate; 13. a stationary pole head fixing plate; 14. a tripod; 15. the slide bar moves up and down; 16. a handle; 17. a movable pole head fixing plate; 18. a support bar; 19. a threaded slider; 20. fixing a nut; 21. a rotating gear; 22. fixing the small bearing; 23. inserting a rod; 24. fixing the bearing;
Detailed Description
Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a device for simulating a leakage magnetic field in an actual working condition, which is used for detecting the vertical penetration depth and the horizontal magnetic flux of leakage magnetic flux when different sample wafers are placed.
The device for measuring the leakage flux of the monolithic laminated core is shown in fig. 1 and comprises a device base 1, a fixed stationary pole head base 2, a movable pole head fixing table 3, a stationary pole head 4 and a movable pole head 5;
the fixed pole head fixing seat 2 is a vertical cuboid, and the bottom of the fixed pole head fixing seat is fixed at one end of the base 1; an inner groove is formed in the center of the inner side of the fixed seat 2 of the fixed pole head, and a fixed plate 13 of the fixed pole head is fixed on the top of the inner side of the fixed seat 2 of the fixed pole head through a bolt to form a jack; the long end of the half-square-shaped fixed pole head 4 penetrates through the jack and is embedded into the built-in groove, and the end part of the short end of the fixed pole head 4 is wound with an excitation winding 6; the lower half part of the inner side of the fixed pole head fixing seat 2 is symmetrically provided with two parallel dovetail grooves at two sides of the built-in groove, and a sliding rod 15 moving up and down is embedded in each dovetail groove; the movable pole head fixing table 3 is a block body with a groove in the middle of the upper surface, is parallel to the base 1, and is fixed with two up-and-down moving slide bars 15 at one end; the L-shaped movable pole head 5 which is placed upside down is embedded in a groove of the movable pole head fixing table 3 and is fixed by a fixing plate 17; the pole head at the vertical end of the movable pole head 5 is vertically opposite to the pole head at the end part of the fixed pole head 4 (projection superposition); a cuboid stop block 11 (the vertical end of the movable pole head 5 is 3-5 cm higher than the cuboid stop block 11) with the same width is attached to the top of the horizontal end of the movable pole head 5, and a fixing plate 12 is further fixed on the outer side of the cuboid stop block 11; on one side of the movable pole head fixing table 3 far away from the slide rod 15, four through holes are symmetrically drilled on two sides of the groove respectively around the vertical end of the movable pole head 5, wherein four threaded rods 18 are vertically penetrated and extend into four holes corresponding to the positions in the base 1 parallel to the movable pole head fixing table 3, and the movable pole head fixing table is fixed in the base 1 by nuts; as shown in fig. 1, on the 4 threaded rods 18, there are 8 nuts in total, and the lower 4 nuts fix the threaded rods 18 on the base 1; the upper 4 nuts are positioned at the lower part of the movable polar head fixing table 3 and play a role in supporting and adjusting the movable polar head fixing table 3.
The fixed pole head fixing seat 2 plays a role in fixing the fixed pole head 4, a gear is arranged in a plate, the position of the movable pole head fixing table 3 can be manually adjusted, the sliding rod 15 is driven to move up and down through a rotating gear, and meanwhile, a part of the upper half part of the fixed pole head fixing seat 2 is symmetrically cut off on two sides of a pole head groove so that the sliding rod 15 has a space when moving upwards and is not blocked by barriers; the tripod 14 plays a role of supporting the stationary pole head 4, and one end of the tripod is fixed on the stationary pole head fixing base 2 by using a nut. The slide bar 15 is fixed with one end of the movable polar head fixing table 3, the slide bar 15 is vertically embedded into the movable polar head fixing table 3, and the movable slide bar 15 can move and is fixed with the movable polar head fixing table 3 to drive the movable polar head fixing table 3 to move together.
The movable polar head fixing table 3 plays a role of supporting and fixing the movable polar head 5, the stop block 11 and the fixing plate 12 play a role of enabling the movable polar head 5 to be tightly attached to the surface of the fixed polar head 4, and the threaded rod 18 plays a role of supporting and moving the movable polar head fixing table 3.
A sample rack is arranged between the pole head of the movable pole head 5 and the pole head of the fixed pole head 4, as shown in fig. 3, the sample rack comprises a sample base 10 and a sample shell 8, wherein a groove is formed in the middle of the sample base 10 and used for placing a sample, and the sample shell 8 is vertically placed in the groove of the sample base 10 and tightly attached to the groove walls on two sides to form a shell with a hollow square shape on two sides; four corners of the sample base 10 are respectively provided with a through hole, 4 threaded support rods 9 pass through the through holes, the sample base is fixed below the sample base 10 by nuts at the upper part, and the sample base is inserted into a hole at the corresponding position of the movable polar head fixing table 3 parallel to the sample frame and is fixed on the movable polar head control table 3.
In addition, as shown in fig. 3, the sample case 8 is composed of two identical vertical plates, namely a left vertical plate and a right vertical plate, and a case (namely, a left part, a right part and an upper part) which is sleeved outside the sample case and takes the shape of a 'door', the vertical plates are provided with dovetail grooves, and convex edges inside the case are inserted into the dovetail grooves, so that the vertical plates and the case are matched together; meanwhile, two through holes are formed in the middle of the side face of the upper portion of the vertical plate, through grooves in the vertical direction are formed in the through holes corresponding to the side face of the shell, the bolts vertically penetrate into the plate and penetrate through the shell sleeved outside, the shell is fixed through nuts, the effect of enabling the shell outside to be attached to the vertical plate is achieved, and the shell is grooved so that the overall height of the sample shell 8 can be adjusted. The sample base plays the effect that supports the sample and reciprocate, and bracing piece 9 plays the effect that supports the sample frame, and screw thread and nut on the bracing piece play the effect of adjusting sample base height, and sample shell 8 plays the effect of adjusting and placing the sample number of piles.
The structure of the fixed pole head fixing seat 2 is shown in fig. 5, 6 and 7, and the upper part of the inner side of the fixed pole head fixing seat is cut off with a part with the thickness of 1-2 cm and the length of one third; the top of the cut-away part is fixed with a fixed plate 13 of the fixed pole head through a bolt to form a jack, the bottom of the cut-away part is fixed with the bottom end of a tripod 14 (namely two parallel inclined rods and a supporting plate at the top in a door shape), and the supporting plate at the top end of the tripod is connected with the bottom of a beam of the fixed pole head 4 to play a role of supporting; the non-dissected part at the inner side is provided with two vertical dovetail grooves which are parallel to each other (used for fixing the sliding rod 15), the center of the top of each dovetail groove (the inner part of the fixed pole head fixing seat 2) is also provided with a vertical groove used for accommodating a threaded sliding strip 19 on the sliding rod 15; the middle part of the outer side of the fixed pole head fixing seat 2 is provided with a horizontal groove, and two vertical intersection points of dovetail grooves on the horizontal groove and the inner side are respectively provided with a sliding positioning through hole; a horizontal inserting rod 23 is arranged in the horizontal groove in the middle of the outer side, the inserting rods 23 are positioned at the sliding positioning through holes and are respectively provided with a gear 21, the inner side of each gear 21 is provided with a bearing 24, and the outer side of each gear 21 is provided with a bearing 22; the inner ring of the gear 21 is provided with teeth, and the corresponding position of the inserted bar 23 is also provided with teeth, and the teeth of the two are meshed with each other; the gear 21 is tangent to the thread sliding strip 19, and teeth on the outer side of the gear 21 and teeth on the thread sliding strip 19 are meshed with each other; two sides of the inserted rod 23 are respectively provided with a handle 16 which is positioned at the side part of the fixed pole head fixing seat 2 and is used for rotating the inserted rod 23;
the cross section of the slide rod 15 is I-shaped (matched with a groove on the inner side of the fixed pole head fixing seat 2), and the upper part of the slide rod is in a dovetail shape as shown in figure 8; the top end is provided with a groove for embedding and fixing a threaded sliding strip 19;
fig. 7 is a sectional view of a part of the stationary pole head holder 2 with respect to the gear, and it can be seen that a portion of the stationary pole head holder 2 where the gear is placed and a portion of the front face of the stationary pole head holder 2 where the groove (dovetail groove in this case) is opened are opened; in fig. 4, there is a groove condition in front of the fixed pole head fixing seat 2, and two sides of the fixed pole head are placed.
The threaded sliding strip 19 is embedded into a groove of the sliding rod 15 and fixed with the sliding rod 15 through a countersunk head bolt, as shown in fig. 8, the threaded sliding strip 19 and the sliding rod 15 are fixed at the end part of the movable polar head fixing table 3 through the countersunk head bolt and connected into a whole. In view of the fact that two sliding rods 15 may move the fixed table 3, four threaded rods and nuts are provided on the other side of the fixed table 3 for supporting and moving.
The handle 16 and the inserted rod 23 are fixed together through a bolt, when the handle is rotated, the gear can be driven to rotate, the threaded sliding strip is enabled to move up and down, the threaded sliding strip drives the sliding rod 15 to move, the sliding rod is vertically embedded into the groove of the movable polar head fixing table 3, and therefore the movable polar head fixing table 3 moves up and down along with the sliding rod.
The fixed pole head fixing seat 2 is embedded into the device base 1 and fixed together to form a main body of the device, the fixed pole head fixing seat 2 firmly fixes the fixed pole head 4 in a groove in the middle of the fixed pole head fixing seat 2 through the fixed pole head fixing plate 13, and the tripod 14 plays a role in supporting the fixed pole head 4, so that the fixed pole head can not incline or fall off due to gravity.
It is together fixed to reciprocate slide bar 15 and screw thread draw runner 19, play the mesh of reciprocating, it is together to reciprocate slide bar 15 and screw thread draw runner 19 and the dovetail of opening at the both ends of motionless utmost point head fixing base 2, it puts into rotatory gear and two big or small bearings 22 and 24 of fixed its both ends to move the opposite side fluting of motionless utmost point head fixing base 2 simultaneously, and accept with an inserted bar 23, two equal size handles are linked up respectively to pole 23 both ends, and fix with the bolt, can the person of facilitating the use adjusts from top to bottom, be carved with the scale on slide bar 15 simultaneously, the precision reaches 1mm, can the person of facilitating the use according to the required range size of regulation.
The slide bar 15 is embedded into the movable polar head fixing table 3 and fixed together, so that the slide bar 15 can drive the fixing table 3 to move up and down, and meanwhile, four threaded support bars are symmetrically embedded into one ends, far away from the slide bar 15, of the base 1 and the movable polar head fixing table 3 and fixed by nuts, so that the movable polar head fixing table 3 is supported and moves up and down along with the threaded support bars. The movable pole head 5 is placed in a groove of the movable pole head fixing table 3 and is fixed by a movable pole head fixing plate 17 and a nut, and the movable pole head 5 is tightly attached to the fixed pole head 4 by a fixed stop block 11 and a fixing plate 12 at one end of the movable pole head far away from the sliding rod 15, so that the magnetic leakage flux is reduced, and a closed magnetic circuit is formed.
The sample 7 and the detection coil are placed in the sample shell 8 and the sample base 10 to simulate the iron core lamination in the actual transformer or inductor, four threaded support rods 9 are symmetrically distributed around the sample base to support the sample base and are embedded into the movable pole head fixing table 3 to achieve the supporting effect, and the height of the sample base is fixed and adjusted by nuts to achieve the purpose of adjusting the distance between the sample and the fixed pole head. Meanwhile, the sample shell 8 can be stretched, slots are formed in two sides of the sample shell 8, the vertical sliding is facilitated, the shell height is adjusted, the sample shell is embedded into the supporting plate and fixed through the matching of a bolt and a nut, and the number of sample layers placed in the sample shell is adjusted.
The working principle and the working process of the invention are as follows:
after the device is installed and fixed according to figure 1, an excitation winding 6 is wound on a stationary pole head 4, a sample 7 is fixed in a sample test bench consisting of a sample fixing shell 8, a sample base 10 and a threaded support rod 9, the excitation winding 6 is supplied with current to generate a magnetic field, the stationary pole head 4, air, the sample test bench and a movable pole head 5 form a closed magnetic circuit, a rotating handle 16 is used for adjusting the distance between the stationary pole head 4 and the movable pole head 5, a rotating nut is used for adjusting the distance between the sample and the stationary pole head 4, the excitation winding 6 is electrified to simulate a leakage magnetic field, and the magnetic flux density on the surface of each sample is detected and recorded by using a detection coil.
Aiming at the lamination made of different magnetic materials, different measuring modes are adopted according to the structural characteristics, for the silicon steel sheet, the lamination is thicker and firmer, and different shapes can be selectively made according to different measuring purposes when a sample is made. Meanwhile, a single-chip sample and a PCB detection board are adopted for measurement, namely a layer of PCB detection board and a layer of silicon steel sheet are tightly attached and superposed together for single-chip measurement; for the nanocrystalline material, because the lamination is thin and brittle, the nanocrystalline material is made into a cuboid and supported by a PCB plate with the same specification when being manufactured, and the PCB detection plate is too thick for the single-layer lamination, which means that an air gap with a certain thickness is introduced, so that the detection result is easy to be inaccurate, and therefore, the measurement is carried out by overlapping several layers of nanocrystalline and a layer of PCB detection plate. The sample rack is made to have two empty sides, so that cuboids with different lengths can be placed, and even the length of the sample wafer can extend out of the sample rack.
The samples tested were 9 pieces, 0.8mm wide, 0.02mm thick, and 0.02mm distance between the pieces. The coil is litz wire, the number of turns is 5 turns, and the material of the pole head is steel-1008.
Fig. 10 is a schematic diagram of a simulation of the magnetic field lines in a pole head and 9 layers of nanocrystalline stack after excitation at a frequency of 20khz, where the magnetic field lines exhibit splay as they pass through the pole head into the nanocrystalline stack, with only a portion passing vertically through the nanocrystalline stack and a substantial portion passing around the stack or diffusing outward from the stack surface, from the stack edge back into the lower pole head. It can be seen that vertical magnetic flux penetrates through each layer of nanocrystalline lamination, the vertical magnetic flux is smaller and smaller with the increase of the number of lamination layers, the phenomenon accords with the situation that edge magnetic flux vertically penetrates through the iron core lamination under the condition of an air gap under the actual working condition, and the research on the fact that the edge magnetic flux vertically penetrates through several layers of the iron core lamination in the actual working condition has important significance for magnetic shielding and eddy current loss calculation.
Fig. 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 pole heads, and the ordinate is the vertical magnetic induction density distribution condition of the sample surface, and it can be seen from the figure that B is very large in the upper pole head, and rapidly descends at the interface between the pole heads and the air, and is stable in the air, and B rapidly descends after entering the sample, because under the action of the external magnetic field, the internal magnetic flux of the sample induces eddy current, and generates a magnetic field opposite to the direction of the external magnetic field, and the top of the external magnetic field is returned, so that most of the magnetic flux of the external magnetic field is led to the horizontal direction to be scattered, and thus the vertical penetration magnetic flux is reduced, and similarly, the vertical magnetic flux in the subsequent sample is reduced in sequence, which accords with the actual situation, and near the lower pole head, the air and the magnetic flux penetrating in the sample are gathered together and returned to the magnetic circuit of the iron core. The device mainly studies the number of layers of vertical magnetic flux penetrating into the sample lamination in an external magnetic field, and from the simulation result, the device accords with the actual situation in the aspects of simulating the distribution situation of the leakage magnetic flux under the actual working condition and penetrating through the sample lamination, has reasonable trend of magnetic induction density in the sample lamination, and has significance for studying the magnetic circuit situation and the law of the edge magnetic flux near the open gap of the iron core lamination in electrical equipment such as a transformer and the like and the study of the generated loss.
Nothing in this specification is said to apply to the prior art.
Claims (4)
1. A measuring device for leakage magnetic flux of a monolithic laminated core is characterized by comprising a device base, a fixed base of a fixed pole head, a fixed platform of a movable pole head, the fixed 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 top of the inner side is provided with a jack; the long end of the semi-square-shaped immobile pole head penetrates through the jack and is fixed on the inner wall of the immobile pole head fixing seat, and an excitation winding is wound on the pole head at the end part of the short end of the immobile pole head; the lower half part of the inner side of the fixed seat of the fixed pole head is symmetrically provided with two parallel dovetail grooves at two sides of the built-in groove, and a sliding rod moving up and down is embedded in each dovetail groove; the movable pole head fixing platform is a block body with a groove in the middle of the upper surface, is parallel to the base, and is fixed with two up-and-down moving slide bars at one end; the L-shaped movable pole head which is placed upside down is embedded in a groove of the movable pole head fixing table and is fixed by a first fixing plate; 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 top of the horizontal end of the movable pole head is attached with a cuboid baffle block with the same width, and a second fixing plate is fixed on the outer side of the cuboid baffle block; four through holes are symmetrically drilled on two sides of the groove respectively on the periphery of the vertical end of the movable pole head on one side of the movable pole head fixing table far away from the slide rod, wherein four threaded rods are vertically penetrated, penetrate through the movable pole head fixing table, penetrate into four holes corresponding to the positions in the base and are fixed through nuts; meanwhile, a nut is screwed below the movable pole head fixing table for fixing;
a sample rack is arranged between the pole head of the movable pole head and the pole head of the fixed pole head, and comprises a sample base and a sample shell, wherein a groove is formed in the middle of the sample base, a sample is placed in the groove, and the sample shell is sleeved on the sample; four corners of the sample base are respectively provided with a through hole, 4 threaded support rods penetrate through the through holes, the upper portion of the sample base is fixed below the sample base through nuts, and the bottom end of the sample base is screwed into the hole in the movable pole head fixing table to be fixed.
2. The apparatus for measuring leakage flux of a monolithic laminated core according to claim 1, wherein the stationary pole head holder is a vertically-erected rectangular parallelepiped, and a portion having a thickness of 1 to 2 cm and a length of one third to two fifths is cut at an upper portion of an inner side thereof; the top of the cut-away part is fixed with a fixed plate of the fixed pole head through a bolt to form a jack, the bottom of the cut-away part is fixed with the bottom end of a tripod, and the top end of the tripod is connected with the bottom of a beam of the fixed pole head to play a supporting role; the non-dissected part on the inner side is provided with two vertical dovetail grooves which are parallel to each other, and the center of the top of each dovetail groove is also provided with a vertical groove; the middle part of the outer side of the fixed seat of the fixed pole head is provided with a horizontal groove, and two vertical intersection points of a dovetail groove on the horizontal groove and the dovetail groove on the inner side are respectively provided with a sliding positioning through hole; a horizontal inserting rod is arranged in the horizontal groove in the middle of the outer side, the inserting rods are positioned at the sliding positioning through holes and are respectively provided with a gear, the inner side of each gear is provided with a bearing, and the outer side of each gear is provided with a bearing; the inner ring of the gear is provided with teeth, and the corresponding position of the inserted bar is also provided with teeth, and the teeth of the gear and the inserted bar are meshed with each other; the gear is tangent to the thread sliding strip, and teeth on the outer side of the gear and teeth on the thread sliding strip are meshed with each other; and the two sides of the inserted bar are respectively provided with a handle which is positioned at the side part of the fixed pole head fixing seat and used for rotating the inserted bar.
3. The apparatus for measuring leakage flux of a monolithic laminated core as recited in claim 1, wherein said slide bar has an i-shaped cross section, a dovetail-shaped upper portion, and a recess formed at a center of a top end thereof for receiving and fixing a screw-thread slide.
4. The apparatus for measuring leakage flux of a monolithic laminated core as set forth in claim 1, wherein said sample case is composed of identical left and right vertical plates and a case shaped like a "door" fitted around the outside thereof, and is clamped and attached by bolts.
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