Permanent magnetic device with permanent magnetic field with gradually-changed rotation direction

Abstract

The utility model relates to a permanent magnetic device with a permanent magnetic field with gradually changing rotation directions, which comprises a magnet yoke with a working area. The first axe-shaped magnetic steel is arranged on the top surface of the working area; the second axe-shaped magnetic steel is arranged on the bottom surface of the working area, and the second axe-shaped magnetic steel and the first axe-shaped magnetic steel are arranged in a mirror image manner; the rotating mechanism is arranged on the magnet yoke and used for rotating the magnet yoke and the first axe-shaped magnetic steel and the second axe-shaped magnetic steel which are arranged on the magnet yoke. Compared with the prior art, the permanent magnet device can rotate along with the rotating shaft, the magnet yoke and the first axe-shaped magnetic steel and the second axe-shaped magnetic steel which are arranged on the magnet yoke only by rotating the rotating shaft, so that the size of a magnetic field is changed, and the direction of the magnetic field is not changed; besides, the size of the magnetic field is changed by rotating the rotating shaft without changing the direction of the magnetic field, so that no extra experiment area is occupied, and the space utilization rate is high.

Description

Technical Field

[0001] The utility model relates to a permanent magnet device, in particular to a permanent magnet device with a gradually changing rotation-direction permanent magnetic field. Background Art

[0002] A magnetic spectrometer is an important instrument for measuring energy spectra, and a permanent magnet device for generating a permanent magnetic field is a key component of the magnetic spectrometer.

[0003] Patent CN213635562U discloses a permanent magnet device with a gradually changing magnetic field. The specific structure is shown in Figure 6 , which solves the problem of the gradually changing magnetic field technology in the linear direction, but does not solve the problem of the gradually changing magnetic field in the curved direction, such as the arc direction. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a permanent magnet device with a gradually changing rotation-direction permanent magnetic field in order to overcome at least one of the defects existing in the above-mentioned prior art. The permanent magnet device is smaller in volume and the magnetic field direction remains unchanged while the intensity can be changed in a specified space.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A permanent magnet device with a gradually changing rotation-direction permanent magnetic field, comprising: a magnetic yoke having a working area; a first axe-shaped permanent magnet disposed on the top surface of the working area; a second axe-shaped permanent magnet disposed on the bottom surface of the working area, the second axe-shaped permanent magnet being arranged opposite and mirror-image to the first axe-shaped permanent magnet; a rotating mechanism disposed on the magnetic yoke for rotating the magnetic yoke and the first and second axe-shaped permanent magnets disposed on the magnetic yoke.

[0007] Further, the magnetic yoke includes a first transverse magnetic yoke and a second transverse magnetic yoke arranged at intervals, and a longitudinal magnetic yoke disposed between the first transverse magnetic yoke and the second transverse magnetic yoke; the first axe-shaped permanent magnet is disposed on the first transverse magnetic yoke; the second axe-shaped permanent magnet is disposed on the second transverse magnetic yoke.

[0008] Further, the longitudinal magnetic yoke is eccentrically disposed between the first transverse magnetic yoke and the second transverse magnetic yoke.

[0009] Further, one surface of the first axe-shaped permanent magnet is attached to the first transverse magnetic yoke, and the distance between the other surface and the second axe-shaped permanent magnet monotonically increases from the back of the axe to the edge of the axe.

[0010] Further, one surface of the second axe-shaped permanent magnet is attached to the second transverse magnetic yoke, and the distance between the other surface and the first axe-shaped permanent magnet monotonically increases from the back of the axe to the edge of the axe.

[0011] Further, a rotating mechanism is provided on the top surface of the first transverse yoke and / or the bottom surface of the second transverse yoke;

[0012] The rotating mechanism includes: a rotating shaft provided in the middle of the first transverse yoke or the second transverse yoke; a fixing plate provided on the rotating shaft; a bearing assembly, which is provided between the fixing plate and the first transverse yoke, or between the fixing plate and the second transverse yoke.

[0013] Further, the bearing assembly includes a bearing and a bearing seat sleeved on the rotating shaft in sequence from inside to outside.

[0014] Further, a runner is provided outside the rotating shaft on the top surface of the first transverse yoke, so as to facilitate the rotation of the yoke and the first ax-shaped permanent magnet and the second ax-shaped permanent magnet provided on the yoke.

[0015] Further, a rotating table is provided outside the rotating shaft on the bottom surface of the second transverse yoke, so as to facilitate the rotation of the yoke and the first ax-shaped permanent magnet and the second ax-shaped permanent magnet provided on the yoke.

[0016] Further, an effective working air gap is provided between the first ax-shaped permanent magnet and the second ax-shaped permanent magnet, and a designated area for experiments is provided in the effective working air gap; the first ax-shaped permanent magnet and the second ax-shaped permanent magnet rotate starting from the ax back. As the first ax-shaped permanent magnet and the second ax-shaped permanent magnet rotate, the effective working air gap monotonically increases from small to large. Therefore, the permanent magnetic field in the designated area of the effective working air gap monotonically decreases gradually, forming a gradually changing magnetic field from large to small.

[0017] Compared with the prior art, the present utility model provides a permanent magnet device with a rotationally varying permanent magnetic field. For this permanent magnet device, only by rotating the rotating shaft, the yoke and the first ax-shaped permanent magnet and the second ax-shaped permanent magnet provided on the yoke will rotate accordingly, thereby changing the magnitude of the magnetic field without changing the direction of the magnetic field, that is, a rotationally varying permanent magnetic field is obtained; in addition, since the present utility model realizes the change of the magnetic field magnitude by rotating the rotating shaft without changing the direction of the magnetic field, it does not require additional experimental area and has high space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the permanent magnet device with a rotationally varying permanent magnetic field in Embodiment 1;

[0019] Figure 2 It is a schematic diagram of the working air gap of the permanent magnet device with a rotationally varying permanent magnetic field in Embodiment 1;

[0020] Figure 3 It is a schematic diagram of the ax-shaped permanent magnet in Embodiment 1;

[0021] Figure 4is Figure 3 a side view of

[0022] Figure 5 is Figure 4 a top view of

[0023] Figure 6 a schematic diagram of the prior art;

[0024] As shown by the reference numerals in the figure: 11 - first transverse yoke; 12 - longitudinal yoke; 13 - second transverse yoke; 21 - first ax-shaped permanent magnet; 22 - second ax-shaped permanent magnet; 3 - effective working air gap; 31 - designated area; 4 - rotating shaft; 5 - bearing; 6 - bearing housing; 7 - fixing plate; 1' - yoke in the prior art; 2' - permanent magnet in the prior art; 3' - effective working air gap in the prior art; 31' - designated area in the prior art; a - ax mouth; b - ax back. Specific embodiments

[0025] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0026] Embodiment 1

[0027] In order to provide a gradually changing permanent magnetic field along a curve direction, this embodiment provides a permanent magnetic device with a rotationally varying permanent magnetic field. The specific structure is shown in Figures 1-5 , and includes:

[0028] A yoke having a working area; a first ax-shaped permanent magnet 21 disposed on the top surface of the working area; a second ax-shaped permanent magnet 22 disposed on the bottom surface of the working area, the second ax-shaped permanent magnet 22 being arranged in a mirror image relative to the first ax-shaped permanent magnet 21; a rotating mechanism disposed on the yoke for rotating the yoke and the first ax-shaped permanent magnet 21 and the second ax-shaped permanent magnet 22 disposed on the yoke.

[0029] Specifically, the yoke is made of a magnetic conductive material and is a magnetic conductive member, support and shield for the rotationally varying permanent magnetic field; the first ax-shaped permanent magnet 21 and the second ax-shaped permanent magnet 22 are directly bonded or mechanically fixed within the working area of the yoke 1. The schematic diagram of the ax-shaped permanent magnet in this embodiment is shown in Figures 3-5 , which is the schematic diagram of one ax-shaped permanent magnet in this embodiment, and the other ax-shaped permanent magnet is mirror-symmetrical to this ax-shaped permanent magnet.

[0030] Please refer again to Figure 1 、 Figure 2, in this embodiment, the yoke includes a first transverse yoke 11 and a second transverse yoke 13 arranged at intervals, and a longitudinal yoke 12 disposed between the first transverse yoke 11 and the second transverse yoke 13; the first ax-shaped magnet 21 is disposed on the first transverse yoke 11; the second ax-shaped magnet 22 is disposed on the second transverse yoke 13; the longitudinal yoke 12 is eccentrically disposed between the first transverse yoke 11 and the second transverse yoke 13; an effective working air gap 3 is provided between the first ax-shaped magnet 21 and the second ax-shaped magnet 22; a designated area 31 for experiments is provided in the effective working air gap 3; the first ax-shaped magnet 21 and the second ax-shaped magnet 22 rotate starting from the ax back b; as the first ax-shaped magnet 21 and the second ax-shaped magnet 22 rotate, the effective working air gap 3 monotonically increases from small to large, so the permanent magnetic field in the designated area of the effective working air gap 3 monotonically decreases gradually, forming a gradually changing magnetic field from large to small.

[0031] Specifically, the relatively arranged first ax-shaped magnet 21 and second ax-shaped magnet 22 are the magnetic sources of the rotationally varying permanent magnetic field, the key components, equivalent to the battery in an electric circuit. Due to its special shape, the ax-shaped magnet provides a greater magnetomotive force at the ax back b than at the ax mouth a in the magnetic circuit, and the actual air gap generated monotonically increases from small to large. Therefore, the permanent magnetic field in the designated area 31 monotonically decreases gradually, forming a gradually changing magnetic field from large to small. The magnetic fields provided by the first ax-shaped magnet 21 and the second ax-shaped magnet 22 are mainly concentrated in the space surrounded by the two relatively ax-shaped magnets, and this space can all be utilized.

[0032] Please refer to again Figure 1 、 Figure 2 , in this embodiment, one side of the first ax-shaped magnet 21 is attached to the first transverse yoke 11, and the distance between the other side and the second ax-shaped magnet 22 monotonically increases from the ax back to the ax mouth; one side of the second ax-shaped magnet 22 is attached to the second transverse yoke 13, and the distance between the other side and the first ax-shaped magnet 21 monotonically increases from the ax back to the ax mouth. At the ax back b of the ax-shaped magnet, the magnetic field strength is the largest at B max , the B at the blade edge min is close to 0; if the ax mouth a of the ax-shaped magnet is cut off, that is, the distance between the ax-shaped magnet and its corresponding transverse yoke is not zero, a gradually changing magnetic field with B min greater than 0 can be obtained.

[0033] Please refer to again Figure 1 、 Figure 2, in this embodiment, a rotating mechanism is provided on the top surface of the first transverse yoke 11 and the bottom surface of the second transverse yoke 13; the rotating mechanism includes: a rotating shaft 4 provided in the middle of the first transverse yoke 11 or the second transverse yoke 13; a fixing plate 7 provided on the rotating shaft 4; a bearing assembly, the bearing assembly is provided between the fixing plate 7 and the first transverse yoke 11, or is provided between the fixing plate 7 and the second transverse yoke 13; the bearing assembly includes a bearing 5 and a bearing seat 6 sleeved on the rotating shaft 4 in sequence from the inside to the outside. The rotating shaft 4, the bearing 5 and the bearing seat 6 can ensure that the magnetic field device can rotate correctly along the axis, changing the magnetic field provided by the magnetic field device to a specified area 31 with a constant magnetic direction and a variable magnetic field intensity.

[0034] Working principle:

[0035] The yoke, the first ax-shaped magnet 21, the second ax-shaped magnet 22 and the working air gap of this embodiment form a magnetic circuit. Due to its special shape, the ax-shaped magnet provides a greater magnetomotive force at the ax back b than at the ax mouth a in the magnetic circuit, and the actual air gap generated is monotonically increasing from small to large. Therefore, the permanent magnetic field in the specified area 31 gradually decreases monotonically, forming a gradually changing magnetic field from large to small.

[0036] For the permanent magnet device of this embodiment, only by rotating the rotating shaft 4, the yoke and the first ax-shaped magnet 21 and the second ax-shaped magnet 22 provided on the yoke will rotate accordingly, thereby changing the magnitude of the magnetic field without changing the direction of the magnetic field; in addition, since this embodiment realizes changing the magnitude of the magnetic field without changing the direction of the magnetic field by rotating the rotating shaft 4, it does not require additional experimental area and has high space utilization rate.

[0037] Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, the difference is that a rotating wheel is provided outside the rotating shaft 4 on the top surface of the first transverse yoke 11 in this embodiment, so as to facilitate the rotation of the yoke and the first ax-shaped magnet 21 and the second ax-shaped magnet 22 provided on the yoke. Optionally, the rotating wheel is a hand wheel for manually changing the magnitude of the magnetic field intensity.

[0039] Embodiment 3

[0040] This embodiment is basically the same as Embodiment 1, the difference is that a rotating table is provided outside the rotating shaft 4 on the bottom surface of the second transverse yoke 13 in this embodiment, so as to facilitate the rotation of the yoke and the first ax-shaped magnet 21 and the second ax-shaped magnet 22 provided on the yoke. Optionally, the rotating table is an electric rotating table for electrically changing the magnitude of the magnetic field intensity.

[0041] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the relevant art may make changes or modifications to the above-disclosed technical content to form equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical content of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A permanent magnetic device with a permanent magnetic field with a gradually changing rotation direction, characterized in that: include: A yoke having a working area; A first axe-shaped magnetic steel (21) disposed on the top surface of the working area; a second axe-shaped magnetic steel (22) disposed on the bottom surface of the working area, wherein the second axe-shaped magnetic steel (22) and the first axe-shaped magnetic steel (21) are arranged in a mirror image relative to each other; The rotating mechanism arranged on the magnetic yoke is used to rotate the magnetic yoke and the first axe-shaped magnetic steel (21) and the second axe-shaped magnetic steel (22) arranged on the magnetic yoke.

2. A permanent magnet device with a gradually changing permanent magnetic field according to claim 1, characterized in that: The magnetic yoke comprises a first transverse magnetic yoke (11) and a second transverse magnetic yoke (13) which are arranged at intervals, and a longitudinal magnetic yoke (12) which is arranged between the first transverse magnetic yoke (11) and the second transverse magnetic yoke (13); The first axe-shaped magnetic steel (21) is arranged on the first transverse magnetic yoke (11); and the second axe-shaped magnetic steel (22) is arranged on the second transverse magnetic yoke (13).

3. A permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: The longitudinal magnetic yoke (12) is eccentrically arranged between the first transverse magnetic yoke (11) and the second transverse magnetic yoke (13).

4. A permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: One side of the first axe-shaped magnetic steel (21) is attached to the first transverse magnetic yoke (11), and the distance between the other side and the second axe-shaped magnetic steel (22) increases monotonically from the axe back to the axe mouth.

5. A permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: One side of the second axe-shaped magnetic steel (22) is attached to the second transverse magnetic yoke (13), and the distance between the other side and the first axe-shaped magnetic steel (21) increases monotonically from the axe back to the axe mouth.

6. A permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: A rotating mechanism is provided on the top surface of the first transverse magnetic yoke (11) and / or the bottom surface of the second transverse magnetic yoke (13); The rotating mechanism comprises: A rotating shaft (4) disposed in the middle of the first transverse magnetic yoke (11) or the second transverse magnetic yoke (13); A fixing plate (7) disposed on the rotating shaft (4); A bearing assembly is disposed between the fixing plate (7) and the first transverse magnetic yoke (11), or between the fixing plate (7) and the second transverse magnetic yoke (13).

7. A permanent magnet device with a gradually changing permanent magnetic field according to claim 6, characterized in that: The bearing assembly comprises a bearing (5) and a bearing seat (6) which are sequentially sleeved on the rotating shaft (4) from the inside to the outside.

8. The permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: A rotating wheel is arranged outside the rotating shaft (4) on the top surface of the first transverse magnetic yoke (11) to facilitate the rotation of the magnetic yoke and the first axe-shaped magnetic steel (21) and the second axe-shaped magnetic steel (22) arranged on the magnetic yoke.

9. The permanent magnet device with a gradually changing permanent magnetic field according to claim 2, characterized in that: A rotating platform is arranged outside the rotating shaft (4) on the bottom surface of the second transverse magnetic yoke (13) to facilitate the rotation of the magnetic yoke and the first axe-shaped magnetic steel (21) and the second axe-shaped magnetic steel (22) arranged on the magnetic yoke.

10. The permanent magnet device with a gradually changing permanent magnetic field according to claim 1, characterized in that: An effective working air gap (3) is provided between the first axe-shaped magnetic steel (21) and the second axe-shaped magnetic steel (22), and a designated area (31) for experiments is provided in the effective working air gap (3).

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