CN201629192U

CN201629192U - Magnetic core with chamfer angle

Info

Publication number: CN201629192U
Application number: CN2010292160758U
Authority: CN
Inventors: 严霄朱勇; 李启国
Original assignee: Emerson Network Power Co Ltd
Current assignee: Astec Power Supply Shenzhen Co Ltd
Priority date: 2010-02-03
Filing date: 2010-02-03
Publication date: 2010-11-10
Anticipated expiration: 2020-02-03

Abstract

The utility model relates to a magnetic core with a chamfer angle, which comprises two sub-magnetic cores (10) the end faces (3) of which are opposite, wherein a chamfer angle is arranged between the end faces of the sub-magnetic cores (10) and the adjacent sides thereof (4). Under the condition without changing the coil, excitation and the like of the magnetic core, only the structure of the end face of the magnetic core is slightly changed, the chamber angle can effectively change the distribution of the magnetic line of force, so the magnetic line of force can shift towards the position close to the center of the magnetic core, the distribution of the magnetic line of force is more even, the net sectional area of the magnetic core is enlarged, the magnetic loss is greatly reduced, and the service efficiency of the magnetic core is improved.

Description

The magnetic core that chamfering is arranged

Technical field

The utility model relates to a kind of magnetic core, more particularly, relates to a kind of magnetic core that chamfering is arranged.

Background technology

When theory was analyzed, we it is generally acknowledged that it also is uniform distributing at the uniform situation lower magnetic force of magnetic circuit line.But in the practical application, magnetic circuit can not be uniform everywhere, with the EE magnetic core 100s among Fig. 1 is example, rectangle frame 1 represented magnetic line of force path (being square frame length of side sum) is lacked a lot than outer rectangle frame 2 represented paths in can obviously finding out, then magnetic resistance is also less relatively, so the magnetic line of force can be selected away the little path of resistance as far as possible.Can know by inference thus, interior rectangle frame 1 and outside zone between the rectangle frame 2, the distribution of the magnetic line of force should be to be reduced gradually to outer rectangle frame 2 density by interior rectangle frame 1, near the magnetic line of force interior rectangle frame 1 is very concentrated.Such distribution causes the cross-sectional area of magnetic core not to be effectively used, and core loss is bigger.And, require the loss of electromagnetic component as far as possible little along with the development trend of power module high efficiency, make the core loss of prior art become a bottleneck.

The utility model content

The technical problems to be solved in the utility model is, cause the utilization not yet in effect of magnetic core cross section, defective that core loss is big at the above-mentioned magnetic core magnetic line of force skewness of prior art, provide a kind of magnetic line of force to be more evenly distributed to make the magnetic core that chamfering is arranged that core loss is little.

The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of magnetic core that chamfering is arranged, comprise two sub-magnetic cores that end face is relative, be provided with chamfering between the end face of described sub-magnetic core and the adjacent side.

In the magnetic core that chamfering is arranged under the utility model, described between end face and side because chamfering forms a fillet surface, the angle angle less than 90 ° between the elongated surfaces of described fillet surface and described end face is described chamfer angle.

In the magnetic core that chamfering arranged described in the utility model, described is 5～85 ° at described chamfer angle.

In the magnetic core that chamfering arranged described in the utility model, described chamfer angle is preferably 30～60 °.

In the magnetic core that chamfering arranged described in the utility model, described chamfer angle the best is 45 °.

Implement the magnetic core that chamfering is arranged of the present utility model, has following beneficial effect: need not to change on the external conditions such as coil on the magnetic core, excitation, only need do very little structural modification to the end face of magnetic core, can change the magnetic line of force effectively to its chamfering distributes, make the magnetic line of force to the offset near core center, the magnetic line of force is more evenly distributed, and the net sectional area of magnetic core increases, magnetic loss reduces greatly, has improved the service efficiency of magnetic core.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the EE core structure schematic diagram of prior art;

Fig. 2 has the front view of preferred embodiment of the magnetic core of chamfering for the utility model;

Fig. 3 is an A-A end face upward view embodiment illustrated in fig. 2;

Fig. 4 is the enlarged diagram of the local P of chamfering of magnetic core shown in Figure 2;

Fig. 5 is the magnetic line of force distribution schematic diagram of prior art;

Fig. 6 is the magnetic line of force distribution schematic diagram of the utility model preferred embodiment.

Embodiment

As shown in Figure 1, conventional EE magnetic core 100s comprises that two E magnetic core 10s promptly are shaped as the magnetic core of " E " shape, and E magnetic core 10s has three external parts that are parallel to each other.The external part end face 3s of two E magnetic core 10s is relative one by one respectively, thereby therefore synthetic " day " word shape forms two square body space 6s between two E magnetic core 10s.Can leave the air gap of certain interval between end face and the end face.Between the end face 3s of conventional E magnetic core 10s and the adjacent side 4s is directly rectangular, and its magnetic line of force of position of the boundary face of the inner close square body space 6s of E magnetic core 10s is than comparatively dense, and thinner relatively away from the position magnetic line of force of square body space 6s boundary face.

In Fig. 2, preferred embodiment shown in Figure 3, EE magnetic core 100 of the present utility model comprises the sub-magnetic core 10 of two " E " shapes equally, and each sub-magnetic core 10 also has three parallel external parts, and two sub-magnetic cores 10 are also relative with the same end face shown in Figure 13, and leave air gap between end face and the end face.Equally, the E shape opening of two sub-magnetic cores 10 is relative, synthetic similar " day " word shape, thus surround two square body spaces 6.Coiling energising on sub-magnetic core 10, then the magnetic line of force in the magnetic field of Chan Shenging passes through on sub-magnetic core 10.

Characteristics of the present utility model are, the chamfering that has transition between the end face 3 of sub-magnetic core 10 and the side 4, because chamfering makes the fillet surface 5 that forms an inclination between end face 3 and the side 4, as shown in Figure 3, Figure 4, chamfer angle is β, and promptly the angle angle less than 90 ° between fillet surface and the end face elongated surfaces is β.In this preferred embodiment, β is 45 °.

Those skilled in the art can know, the scope of β not only is defined as 45 ° of present embodiment, thereby every between end face and side chamfering make the more uniform magnetic core of the magnetic line of force be sub-magnetic core of the present utility model, can be designed to 5～85 ° as chamfer angle, wherein more excellent is 30～60 °, and the chamfer angle with the even effect of the best magnetic line of force is 45 °.Those skilled in the art also knows, the fillet surface among the embodiment might not be plane completely, and it has the very little arc surface of radius can be designed as with edge that end face is connected with the side respectively; And magnetic core of the present utility model is not defined as a pair of EE magnetic core yet, as long as other have two magnetic cores that the end face relative engagement is communicated with magnetic line of force sealing, is magnetic core of the present utility model, as " U " shape, " Contraband " shape magnetic core etc.

With the EE42/20 magnetic core is example, get two groups of EE42/20 magnetic cores, every group of magnetic core has two E shape magnetic cores, air gap 0.4mm between two E shape magnetic cores, under the situation that does not change all external factors such as core material, core shapes size, coil specification, excitation, one group keeps original shape, is conventional EE magnetic core 100s; The end face of two sub-magnetic cores of another group (being E shape magnetic core) carries out chamfering by certain processing mode, and chamfer angle beta is 45 °, it is chamfering and the fillet surface that forms and the angle angle of end face elongated surfaces are 45 °, the adjacent straight line of fillet surface 5 and end face 3 is to the distance of side 4, be that shown in Figure 4 to get 1mm apart from a long, and the adjacent straight line in fillet surface 5 and side 4 is to the distance of end face 3, and distance b promptly shown in Figure 4 is got 1mm and grown.Then pass through the EE42/20 magnetic core EE magnetic core 100 just of the present utility model after the chamfering like this.

To two groups of EE42/20 magnetic core energisings, the magnetic line of force distribution schematic diagram of the two is respectively as Fig. 5, shown in Figure 6, and wherein, Fig. 5 is that the magnetic line of force of the EE magnetic core 100s of routine distributes, and Fig. 6 is that the magnetic line of force of EE magnetic core 100 of the present utility model distributes.

Know easily that by Fig. 5 for the EE magnetic core 100s of routine, its magnetic line of force 200s is intensive in the position distribution near square body space 6s boundary face, and sparse away from its magnetic line of force of position of boundary face.Therefore, the end face 3s of conventional EE magnetic core 100s makes the magnetic line of force more concentrate on the magnetic circuit inboard, the edge surface of promptly square body space 6s, and the shortest, the minimum place of magnetic resistance of magnetic circuit just, and the long position magnetic line of force of magnetic circuit distributes sparse.

As shown in Figure 6, for EE magnetic core 100 of the present utility model, though its magnetic line of force 200 also is close near the position of square body space 6 boundary faces, dredge position away from boundary face, but for Fig. 5, thereby EE magnetic core of the present utility model 100 makes originally the shortest inboard magnetic circuit magnetic resistance become big owing to open chamfering, and the magnetic line of force moves to the core center position, the magnetic line of force is more evenly distributed, and the density of line of magnetic force from the magnetic circuit inboard to the outside is more or less the same.The relatively evenly distribution of the magnetic line of force can increase the net sectional area Ae of EE magnetic core 100, thereby reduces magnetic loss.

Chamfer angle beta is the important parameter of EE magnetic core 100 of the present utility model, and different chamfer angle beta will directly influence the distribution density of the magnetic line of force.The selected β of the preferred embodiment of Fig. 2, Fig. 6 is 45 °, also can select less than 45 ° or greater than 45 ° β.Experiment shows, same EE magnetic core is carried out the end face chamfering, and as shown in Figure 4 identical apart from a during chamfering, so, chamfer angle beta during less than 45 ° the magnetic line of force of EE magnetic core distribute and be more evenly distributed than the magnetic line of force greater than 45 °.

In summary, under equal comparison condition, have the magnetic core of chamfering to be more evenly distributed than its magnetic line of force of the magnetic core that does not have chamfering, the magnetic core of chamfering during less than 45 ° is more evenly distributed than chamfering its magnetic line of force of magnetic core greater than 45 °.

In conjunction with the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, also can make a lot of forms, these all belong within the protection of the present utility model.

Claims

1. the magnetic core that chamfering is arranged comprises the sub-magnetic core (10) that two end faces (3) are relative, it is characterized in that, is provided with chamfering between the end face (3) of described sub-magnetic core (10) and the adjacent side (4).

2. the magnetic core that chamfering is arranged according to claim 1, it is characterized in that, described between end face (3) and side (4) because chamfering forms a fillet surface (5), the angle angle less than 90 ° between the elongated surfaces of described fillet surface (5) and end face (3) is described chamfer angle.

3. the magnetic core that chamfering is arranged according to claim 2 is characterized in that, described chamfer angle is 5～85 °.

4. the magnetic core that chamfering is arranged according to claim 3 is characterized in that, described chamfer angle is 30～60 °.

5. the magnetic core that chamfering is arranged according to claim 3 is characterized in that, described chamfer angle is 45 °.