CN220063003U - Magneto-electric encoder with magnetic interference resistance and no magnetic interference - Google Patents
Magneto-electric encoder with magnetic interference resistance and no magnetic interference Download PDFInfo
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- CN220063003U CN220063003U CN202321114784.1U CN202321114784U CN220063003U CN 220063003 U CN220063003 U CN 220063003U CN 202321114784 U CN202321114784 U CN 202321114784U CN 220063003 U CN220063003 U CN 220063003U
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- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000036039 immunity Effects 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
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- 239000000696 magnetic material Substances 0.000 description 1
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Abstract
The magneto-electric encoder comprises a shell (4), a rotating shaft (1) arranged above the shell (4) and connected with the shell (4), a magnetic piece (6) arranged on the inner side of the shell (4) and connected with the rotating shaft (1), a rear cover (9) arranged below the shell (4) and connected with the shell (4), a circuit board (8) arranged on the upper side of the rear cover (9) and a magnetic sensitive angle sensor (7) arranged on the upper side of the circuit board (8); wherein, the shell (4) and the back cover (9) are both made of magnetic shielding materials. An angle sensor (7) is located coaxially below the magnetic member (6). The utility model has the beneficial effects that: 1. the magneto-electric encoder with anti-magnetic interference and no external magnetic interference has the characteristics of anti-strong magnetic interference and no magnetic interference to other devices, and can still keep high precision after the working magnetic field is influenced; 2. no magnetic interference to the outside, and is more universal in various fields; 3. a wide operating temperature range.
Description
Technical Field
The utility model belongs to the technical field of the electrical technique and specifically relates to an anti-magnetic interference and external magneto-electric encoder that does not have magnetic interference.
Background
Existing magnetic encoders are based on the magnetic induction principle, and a magnet or a magnetic ring is needed to be added on the encoder. There are problems in that magnetic interference cannot be prevented, and in that magnetic interference is caused to external parts due to the use of magnets or magnetic rings. Magnetic encoders, in particular based on tunnel magnetoresistance effect (TMR) technology sensors, are particularly sensitive to magnetic disturbances. The range of applications and reliability of such magnetic encoders is greatly limited. Magnetic interference generated by the magnetic encoder itself can also interfere with surrounding magnetic induction devices.
In view of this, there is a need to develop a magneto-electric encoder that is resistant to strong magnetic interference and is free from external magnetic interference.
Disclosure of Invention
The present utility model aims to solve at least to some extent one of the above technical problems.
The utility model is based on the object of providing a magneto-electric encoder which is resistant to strong magnetic interference and is free of magnetic interference to the outside, in particular a miniature magnetic encoder of small dimensions, which is resistant to magnetic interference and is free of magnetic radiation to the outside.
To achieve the above object, an embodiment of the present utility model discloses a magneto-electric encoder that is resistant to strong magnetic interference and free from external magnetic interference, comprising a housing (4), a rotation shaft (1) disposed above the housing (4) and connected to the housing (4), a magnetic member (6) disposed inside the housing (4) and connected to the rotation shaft (1), a rear cover (9) disposed below the housing (4) and connected to the housing (4), a circuit board (8) disposed on an upper side of the rear cover (9), and a magneto-sensitive angle sensor (7) disposed on an upper side of the circuit board (8); wherein the shell (4) and the rear cover (9) are both made of magnetic shielding materials.
In addition, the magneto-electric encoder with strong magnetic interference resistance and no magnetic interference to the outside according to the technical scheme of the utility model can also have the following additional technical characteristics:
optionally, the magneto-dependent angle sensor (7) is a tunnel magnetoresistance effect angle sensor.
Optionally, the angle sensor (7) is located coaxially below the magnetic member (6).
Optionally, a plurality of rotating bearings (3) are also arranged between the shell (4) and the rotating shaft (1).
Optionally, a pair of said swivel bearings (3) are provided, respectively at the upper and lower ends of said housing (4) connected to said swivel shaft (1).
Optionally, a snap spring (2) is further arranged at the joint of the upper end face of the shell (4) and the rotating shaft (1).
Optionally, a plurality of screw holes are formed in the upper end of the shell (4).
Optionally, the shell (4) and the rear cover (9) are fixedly connected in a gluing mode, a sealing mode or a welding mode.
Optionally, a plurality of screw holes are formed at the lower end of the shell (4) and the rear cover (9), and the shell (4) is fixedly connected with the rear cover (9) through screws.
Optionally, the magnetic member (6) is a magnet or a magnetic ring.
The utility model has the beneficial effects that: 1. the magneto-electric encoder with anti-magnetic interference and no external magnetic interference has the characteristics of anti-strong magnetic interference and no magnetic interference to other devices, and can still keep high precision after the working magnetic field is influenced; 2. no magnetic interference to the outside, and is more universal in various fields; 3. a wide operating temperature range.
Drawings
FIG. 1 is a schematic diagram of a magneto-electric encoder with magnetic interference immunity and no magnetic interference to the outside according to one embodiment of the present utility model;
FIG. 2 is a perspective view of a magneto-electric encoder with magnetic interference immunity and no magnetic interference to the outside provided by one embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a magneto-electric encoder with anti-magnetic interference and no magnetic interference to the outside according to another embodiment of the present utility model.
Reference numerals:
the device comprises a rotating shaft 1, a clamping spring 2, a rotating bearing 3, a shell 4, a magnetic piece 6, a magnetic sensitive angle sensor 7, a circuit board 8, a rear cover 9 and a screw 10.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or components/elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
The following describes a magneto-electric encoder with anti-magnetic interference and no magnetic interference to the outside according to the embodiment of the present utility model with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a magneto-electric encoder with magnetic interference immunity and no magnetic interference to the outside according to an embodiment of the present utility model; FIG. 2 is a perspective view of a magneto-electric encoder with magnetic interference immunity and no magnetic interference to the outside provided by one embodiment of the present utility model; as shown in fig. 1-2, the magneto-electric encoder with magnetic interference resistance and no magnetic interference to the outside comprises a shell 4, a rotating shaft 1 arranged above the shell 4 and connected with the shell 4, a magnetic piece 6 arranged inside the shell 4 and connected with the rotating shaft 1, a rear cover 9 arranged below the shell 4 and connected with the shell 4, a circuit board 8 arranged on the upper side of the rear cover 9, and a magneto-sensitive angle sensor 7 arranged on the upper side of the circuit board 8; wherein, the shell 4 and the back cover 9 are both magnetic shielding materials.
Specifically, the circuit board 8 and the magneto-sensitive angle sensor 7 are covered by a housing formed by the housing 4 and the rear cover 9 made of a magnetically shielding material, and most of the magnetic field lines pass through the wall of the housing because the magnetic permeability of the magnetic material is much greater than that of air, and the magneto-sensitive lines are few in the cavity in the housing, which achieves the purpose of magnetic shielding. Therefore, the encoder can operate under the working condition of strong electromagnetic radiation outside, and has no magnetic interference to the outside. One end of the rotating shaft 1 outside the shell is connected with a measured object, the measured object can be a motor, and the motor rotates to drive the rotating shaft 1 to rotate.
In addition, the magneto-electric encoder with magnetic interference resistance and no magnetic interference can be based on Tunnel Magnetic Resistance (TMR) technology, and can still maintain high-precision output in a wide working temperature range.
The shell and the rear cover use magnetic conductive materials to absorb the magnetic field of the magnetic sensitive device, so that the internal distortion of the working magnetic field of the encoder is caused, and the angle measurement precision of the sensor is affected. The design needs to adopt a compensation algorithm, corrects distorted magnetic fields, and can still maintain high-precision performance under the condition of high-strength magnetic isolation.
The magneto-electric encoder with the anti-magnetic interference and the magnetic interference free from outside has the function of resisting strong magnetic interference, has no magnetic interference to the outside, and can still keep high precision and high performance under the condition of high-strength magnetic isolation. And no magnetic interference is generated to the outside, so that the method is more universal in various fields, and particularly in the aircraft industry, the problem of magnetic interference is solved.
According to one embodiment of the utility model, the magneto-sensitive angle sensor 7 is a tunnel magnetoresistance effect angle sensor.
Specifically, the TMR angle sensor can convert a rotation-varying magnetic field into a variation in output voltage, and thus can be used to measure the rotation angle. The TMR magnetic sensor used in the utility model can compensate the output signal change caused by the tiny change of a magnetic field, the temperature coefficient of a magnet and the tiny change of the distance and the position of a magnetic sensor due to the integration of an automatic calibration algorithm, thereby achieving the high accuracy and stability of angle detection, and being suitable for application scenes with high precision requirements.
According to one embodiment of the utility model, the angle sensor 7 is located coaxially below the magnetic member 6.
In particular, in order to accurately measure the magnetic field and to design the compensation algorithm so as to obtain a more accurate measurement, the angle sensor 7 may be located coaxially below the magnetic member 6.
According to one embodiment of the utility model, one or more swivel bearings 3 are also provided between the housing 4 and the swivel shaft 1.
According to an embodiment of the present utility model, a pair of rotation bearings 3 are provided at upper and lower ends of the housing 4 connected to the rotation shaft 1, respectively.
Specifically, in order to reduce wear of the rotary shaft 1 and the housing 4, a pair of rotary bearings 3 may be further provided at both ends of the connection thereof.
According to one embodiment of the utility model, a snap spring 2 is further arranged at the joint of the upper end surface of the housing 4 and the rotating shaft 1.
In particular, the snap spring may act to prevent axial movement of the rotating shaft 1 during operation.
According to one embodiment of the utility model, the upper end 9 of the housing 4 is provided with a number of screw holes.
Specifically, screw holes at the upper end are used to fix the housing to an external device.
According to one embodiment of the utility model, the shell (4) and the rear cover (9) are fixedly connected through glue, sealing or welding.
Specifically, the rear cover 9 may be connected to the housing 4 in various ways, and the specific connection manner may include: and (5) gluing, sealing and welding. It should be noted that before the rear cover 9 is attached, it is necessary to ensure that the rear cover 9 presses against the circuit board 8.
Fig. 3 is a schematic structural diagram of a magnetic shielding and non-radiative encoder according to another embodiment of the present utility model, as shown in fig. 3, the lower end of the housing (4) and the rear cover (9) are provided with a plurality of screw holes, and the housing (4) and the rear cover (9) are fixedly connected by screws.
Specifically, the lower end of the housing 4 may also be provided with a screw hole, and a screw hole matching the screw hole is also provided at the rear cover 9 vertically below the screw hole, through which the housing 4 and the rear cover 9 are screwed together using a screw 10 in this embodiment.
According to one embodiment of the utility model, the magnetic member 6 is a magnet or a magnetic ring.
Specifically, a magnet or a magnetic ring or the like may be selected as the magnetic member 6 according to the application requirements.
The above embodiments are preferred embodiments of the present utility model, and besides, the present utility model may be implemented in other ways, and any obvious substitution is within the scope of the present utility model without departing from the concept of the present utility model.
Claims (10)
1. The magneto-electric encoder is characterized by comprising a shell (4), a rotating shaft (1) arranged above the shell (4) and connected with the shell (4), a magnetic piece (6) arranged on the inner side of the shell (4) and connected with the rotating shaft (1), a rear cover (9) arranged below the shell (4) and connected with the shell (4), a circuit board (8) arranged on the upper side of the rear cover (9) and a magneto-sensitive angle sensor (7) arranged on the upper side of the circuit board (8);
wherein the shell (4) and the rear cover (9) are both made of magnetic shielding materials.
2. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the magneto-dependent angle sensor (7) is a tunnel magneto-resistance effect angle sensor.
3. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the angle sensor (7) is located coaxially below the magnetic element (6).
4. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: one or more rotating bearings (3) are also arranged between the housing (4) and the rotating shaft (1).
5. The magneto-electric encoder of claim 4, wherein the magneto-electric encoder is free of magnetic interference and magnetic interference to the outside, and further comprising: a pair of the rotating bearings (3) are provided, which are respectively provided at the upper end and the lower end of the housing (4) connected to the rotating shaft (1).
6. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the connection part of the upper end surface of the shell (4) and the rotating shaft (1) is also provided with a clamp spring (2).
7. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the upper end of the shell (4) is provided with a plurality of screw holes.
8. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the shell (4) is fixedly connected with the rear cover (9) through an adhesive, or a sealing or welding mode.
9. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the lower end of the shell (4) and the rear cover (9) are provided with a plurality of screw holes, and the shell (4) is fixedly connected with the rear cover (9) through screws.
10. The magneto-electric encoder of claim 1, wherein the magneto-electric encoder is free of magnetic interference and comprises: the magnetic piece (6) is a magnet or a magnetic ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321114784.1U CN220063003U (en) | 2023-05-10 | 2023-05-10 | Magneto-electric encoder with magnetic interference resistance and no magnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321114784.1U CN220063003U (en) | 2023-05-10 | 2023-05-10 | Magneto-electric encoder with magnetic interference resistance and no magnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220063003U true CN220063003U (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321114784.1U Active CN220063003U (en) | 2023-05-10 | 2023-05-10 | Magneto-electric encoder with magnetic interference resistance and no magnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220063003U (en) |
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2023
- 2023-05-10 CN CN202321114784.1U patent/CN220063003U/en active Active
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