TW202234430A - Magnetic field generator with magnetic flux guide structures - Google Patents

Abstract

The magnetic field generating device of the present invention includes a yoke with two supporting parts and a connecting part. The two ends of the connecting portion respectively have a bonding surface, and the joint between the two supporting portions and the connecting portion also has a bonding surface. The bonding area of the bonding surface at both ends of the connecting part and the bonding surface of the two supporting parts more than 90%. Each of the two supporting parts is provided with a perforation and each perforation is provided with a magnetic pole, and the outer diameter of the magnetic pole is fitted to the inner diameter of the perforation of the supporting part. The two coils are respectively cover on the two magnetic poles, each of the two coils has an inner hole, and the wall surface of each inner hole is completely attached to the surface of the magnetic pole.

Description

Magnetic field generating device to increase the smoothness of magnetic flux guiding

The present invention relates to the generation and control of a magnetic field, in particular to a magnetic field generating device for increasing the smoothness of magnetic flux guiding.

At present, many products in daily life need to use magnetic sensors, and in order to calibrate these magnetic sensors, a uniform, stable and controllable magnetic field is required. For example, the 3480 Dipole or 5403 Dipole produced by GMWassociates in the United States are all used to generate magnetic fields, but their structures are relatively complex.

The main purpose of the present invention is to provide a magnetic field generating device that can generate uniform and stable magnetic flux and can increase the smoothness of magnetic flux guiding. In order to achieve the above-mentioned main purpose, the magnetic field generating device of the present invention includes a yoke having two supporting parts and a connecting part. Both ends of the connecting portion have a fitting surface respectively, and the joints between the two supporting portions and the connecting portion also have a fitting surface respectively. The bonding area of the bonding surfaces at both ends of the connecting portion and the bonding surfaces of the two supporting portions exceeds 90%. Each of the two support parts is provided with a through hole, and each through hole is provided with a magnetic pole, and the outer diameters of the two magnetic poles fit with the inner diameter of the through hole of the support part. The two coils are respectively sleeved on the two magnetic poles, and each of the two coils has an inner hole, and the wall surface of each inner hole is completely attached to the surface of the magnetic pole in the entire length range of the inner hole.

With the above-mentioned structure, the magnetic field generating device of the present invention is made of magnetic conductive material and has a complete contact with the coil, the magnetic pole and the yoke, so the magnetic field lines of the magnetic field can be affected by the magnetic pole, the supporting part and the connecting part. The complete connection and guidance of the magnetic flux is completely connected from the coil at one end to the coil at the other end, so the smoothness of the magnetic flux guidance can be increased.

Preferably, each adjustment group includes a mounting seat, a screw rod and a knob. The screw is connected to the pole at one end.

Preferably, the screw of the adjustment group is screwed on the mounting seat, and the knob is set at one end of the screw, and turning the knob can drive the magnetic pole to move back and forth to adjust the distance between the two magnetic poles.

Preferably, two coil frames are arranged across the connecting portion of the yoke, and each coil frame has a bearing portion for supporting the corresponding coil.

The applicant first explains that in the entire specification, including the embodiments described below and the claims of the scope of the patent application, the terms related to the directionality are based on the directions in the drawings. Next, in the embodiments and drawings to be introduced below, the same element numbers represent the same or similar elements or their structural features.

Please refer to FIG. 1 to FIG. 6 , which are the first embodiment of the present invention. The magnetic field generating device of the present invention includes:

A yoke 10 is made of magnetically conductive material, and includes two supporting parts 11 and a connecting part 12 . Each of the two support parts 11 is provided with a through hole 13 , the connecting part 12 is arranged between the two support parts 11 and is locked and fixed by a plurality of bolts 14 , and the two through holes 13 of the two support parts 11 are on the same axis. Both ends of the connecting portion 12 have a bonding surface 121 respectively, and the two supporting portions 11 and the connecting portion 12 are joined with a bonding surface 111 respectively. The bonding surfaces 121 at both ends of the connecting portion 12 are bonded to the bonding surfaces 111 of the two supporting portions 11 . In terms of area, the bonding surfaces 121 of the connecting portion 12 are bonded to the bonding surfaces 111 of the two supporting portions 11 . The bonding area is preferably more than 90%, and the better state is complete bonding, because the higher the bonding area, the better and more complete the magnetic flux conduction will be. In the best state, the abutment surface 121 of the connecting portion 12 and the abutting surfaces 111 of the two supporting portions 11 are completely abutted, and the abutting surface 121 of the connecting portion 12 is abutting with the two supporting portions 11 . The length and width of the surface 111 are the same.

The two magnetic poles 20 are made of magnetically conductive material, and are respectively penetrated through the through holes 13 of the two supporting portions 11 . The two magnetic poles 20 are cylindrical, and one end of the two magnetic poles 20 is provided with a conical portion 21, and the two conical portions 21 are arranged oppositely. And the best state is that the two supporting parts through holes 13 are in contact with the outer surface of the cylinder of the magnetic pole 20 in the entire length range. The central axes of the two magnetic poles 20 may preferably be on the same axis, because the higher the concentricity, the more stable the magnetic field will be.

Two adjustment groups 30 are respectively disposed at the through holes 13 of the two support portions 11 , and each adjustment group 30 includes a mounting seat 31 , a screw 32 and a knob 33 . The mounting seat 31 is fixed at the through hole 13 , the screw rod 32 is screwed on the mounting seat 31 and is engaged with a magnetic pole 20 at one end. The knob 33 is disposed at one end of the screw 32 , and turning the knob 33 can rotate the screw 32 to drive the magnetic pole 20 to move back and forth along an axis. Thereby, the distance between the two magnetic poles 20 can be adjusted.

Two coils 40 are respectively sleeved on the two magnetic poles 20 , and each of the two coils 40 has an inner hole 41 , and the wall surface of each inner hole 41 is attached to the surface of the corresponding magnetic pole 20 . The wall surface of the hole 41 is in full contact with the surface of the magnetic pole 20 over the entire length.

Two bobbins 50 straddle the connecting portion 12 of the yoke 10 , each bobbin 50 corresponds to one of the coils 40 , and each bobbin 50 has a bearing portion 51 for supporting the corresponding coil 40 . The coil former 50 can be locked and fixed to the connecting portion 12 of the yoke 10 by means of bolts 52 .

According to physics, the magnetic field line is a closed curve. With the structure of the present invention, when the two coils 40 are energized to form a magnetic field, because the coils 40, the magnetic poles 20 and the yoke 10 are all made of magnetically conductive materials and have complete integrity. Therefore, the magnetic field lines of the magnetic field can be completely connected and guided by the magnetic pole 20, the supporting part 11 and the connecting part 12, and the coil at one end is completely connected to the coil at the other end. By reducing the number of components and components The gap between them and the contact area should be increased as much as possible to increase the smoothness of magnetic flux guidance, so as to improve the efficiency of magnetic field generation.

As shown in FIG. 7 , it is another embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the coil former 50 is not provided in this embodiment. The purpose of setting the coil frame is to adjust the distance between the coils in one direction, and in the second direction to avoid the deformation of the magnetic poles. Because if the coil is large and heavy, when it is suspended on the magnetic pole, the weight of the coil may deform the magnetic pole, causing the concentricity of the two magnetic poles to shift. However, if the coil is small and light in weight, there will be no such problem, so the coil frame does not need to be set.

In addition, it should be mentioned that in the foregoing description, the yoke is composed of two supporting parts and a connecting part, but the two supporting parts and the connecting part may also be integrally formed to form a similar U-shaped structure.

10: Yoke 11: Support part 111: Fitting surface 12: Connection part 121: Fitting surface 13: Perforation 14: Bolts 20: Magnetic pole 21: Taper 30: Adjustment group 31: Mounting seat 32: Screw 33: Knob 40: Coil 41: Inner hole 50: Coil former 51: Bearing Department 52: Bolts

FIG. 1 is a perspective view of a first embodiment of the present invention. FIG. 2 is an exploded view of the first embodiment of the present invention. FIG. 3 is a front view of the first embodiment of the present invention. FIG. 4 is a side view of the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4 . FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3 . FIG. 7 is a perspective view of a second embodiment of the present invention.

11: Support part

111: Fitting surface

12: Connection part

121: Fitting surface

20: Magnetic pole

21: Taper

31: Mounting seat

32: Screw

33: Knob

40: Coil

Claims (9)

A magnetic field generating device, comprising: A yoke (10), made of magnetically conductive material, includes two supporting parts (11) and a connecting part (12), the connecting part (12) is arranged between the two supporting parts (11), the two supporting parts (11) Each of the supporting portions (11) is provided with a through hole (13), the two ends of the connecting portion (12) are respectively provided with a fitting surface (121), and the joints of the two supporting portions (11) and the connecting portion (12) also have a bonding surface (111), the bonding area of the bonding surface (121) of the connecting portion (12) and the bonding surface (111) of the two supporting portions (11) exceeds 90%; Two magnetic poles (20) are made of magnetically conductive material and are respectively inserted through the through holes (13) of the two supporting parts (11), the two magnetic poles (20) are cylindrical, and one end of the two magnetic poles (20) is provided There is a conical part (21), and the two conical parts (21) are oppositely arranged, and the outer diameter of the two magnetic poles (20) fits with the inner diameter of the through hole (13) of the support part; Two adjustment groups (30) are respectively arranged at the through holes (13) of the two support parts (11), and each adjustment group (30) includes a mounting seat (31), a screw (32) and a knob (33), The mounting seat (31) is fixed at the through hole (13), the screw (32) is screwed on the mounting seat (31) and engages with a magnetic pole (20) at one end, and the knob (33) is mounted on the mounting seat (31) one end of the screw (32); Two coils (40) are respectively sleeved on the two magnetic poles (20), each of the two coils (40) has an inner hole (41), and the wall surface of each inner hole (41) is attached to the corresponding magnetic pole (41). 20) surface. The magnetic field generating device according to claim 1, wherein the abutment surface (121) of the connecting portion (12) is completely abutted with the abutment surfaces (111) of the two support portions (11) in terms of area. The magnetic field generating device according to claim 2, wherein the bonding surface (121) of the connecting portion (12) and the bonding surfaces (111) of the two supporting portions (11) have the same length and width. The magnetic field generating device according to claim 3, wherein the yoke (10) is integrally formed. The magnetic field generating device according to claim 3, wherein the wall surface of the inner hole (41) is in full contact with the surface of the magnetic pole (20) throughout its entire length. The magnetic field generating device according to claim 5, wherein the through holes (13) of the two supporting parts are in contact with the surface of the magnetic pole (20) throughout the entire length. The magnetic field generating device according to claim 5, wherein the central axes of the two magnetic poles (20) are on the same axis. The magnetic field generating device according to claim 3, further comprising two coil formers (50) straddling the connecting portion (12) of the yoke (10), each coil former (50) having a bearing portion ( 51) for supporting the corresponding coil (40). The magnetic field generating device according to claim 7, wherein the mounting seat (31) is fixed at the through hole (13), and the screw rod (32) is screwed on the mounting seat 31.

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