CN212674174U - Sensor position magnet and Hall position sensor - Google Patents
Sensor position magnet and Hall position sensor Download PDFInfo
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- CN212674174U CN212674174U CN202021857683.XU CN202021857683U CN212674174U CN 212674174 U CN212674174 U CN 212674174U CN 202021857683 U CN202021857683 U CN 202021857683U CN 212674174 U CN212674174 U CN 212674174U
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Abstract
The utility model discloses a sensor position magnet and hall position sensor, sensor position magnet is applied to hall position sensor, including radially equally divided first semicircular magnet and second semicircular magnet, first semicircular magnet and second semicircular magnet are axial polarization magnet, the magnetic pole of first semicircular magnet includes first semicircular upper magnetic pole and first semicircular lower magnetic pole, the magnetic pole of second semicircular magnet includes second semicircular upper magnetic pole and second semicircular lower magnetic pole; the first semicircular upper magnetic pole and the first semicircular lower magnetic pole are opposite in polarity, the second semicircular upper magnetic pole and the second semicircular lower magnetic pole are opposite in polarity, the first semicircular upper magnetic pole and the second semicircular upper magnetic pole are opposite in polarity, and the first semicircular magnet and the second semicircular magnet are identical in specification. The utility model discloses can guarantee that hall position sensor makes the structure miniaturized under the not influenced condition of performance.
Description
Technical Field
The utility model relates to a hall position sensor technical field, concretely relates to sensor position magnet and hall position sensor.
Background
The hall position sensor provides a position signal by detecting the angle of the hall device relative to the magnetic field. In order to meet the requirement that a detection plane has a south pole (S) and a north pole (N), magnets used by the existing Hall position sensor adopt radial magnetization, even though magnetic poles of the magnets are positioned at the left side and the right side of the magnets, the positions of the magnets and a Hall device are vertical, so that magnetic lines of force are distributed on the magnet plane more strongly, but the magnetic lines of force on the detection plane of the Hall device are weaker. The consequences of this are: if a plurality of magnets need to be placed on one Hall position sensor, in order to reduce the mutual influence between the magnetic poles of two adjacent magnets, the distance between the two adjacent magnets has to be enlarged, so that the structure of the Hall position sensor is enlarged, and the miniaturization of the Hall position sensor is influenced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a sensor position magnet and hall position sensor aims at realizing the miniaturized purpose of hall position sensor under the not influenced condition of performance.
The embodiment of the utility model provides a sensor position magnet is applied to hall position sensor, including radially equally divided first semicircular magnet and second semicircular magnet, first semicircular magnet and second semicircular magnet are axial polarization magnet, the magnetic pole of first semicircular magnet includes first semicircular upper magnetic pole and first semicircular lower magnetic pole, the magnetic pole of second semicircular magnet includes second semicircular upper magnetic pole and second semicircular lower magnetic pole;
the first semicircular upper magnetic pole and the first semicircular lower magnetic pole are opposite in polarity, the second semicircular upper magnetic pole and the second semicircular lower magnetic pole are opposite in polarity, the first semicircular upper magnetic pole and the second semicircular upper magnetic pole are opposite in polarity, and the first semicircular magnet and the second semicircular magnet are identical in specification.
Furthermore, the thickness of the first semicircular magnet and the thickness of the second semicircular magnet are both 0.5 mm-1.5 mm.
Furthermore, the diameters of the first semicircular magnet and the second semicircular magnet are both 3 mm-6 mm.
Further, the polarity of the first semicircular upper magnetic pole is an N pole, and the polarity of the first semicircular lower magnetic pole is an S pole.
Further, the thickness of the first semicircular magnet and the second semicircular magnet is 1 mm.
The embodiment of the utility model provides a hall position sensor is still provided, include hall device and be located hall device top as above sensor position magnet.
Furthermore, the height between the sensor position magnet and the Hall device is 0.5 mm-7 mm.
Furthermore, the sensor comprises a plurality of Hall devices, and a sensor position magnet is arranged above each Hall device.
Further, the distance between adjacent sensor position magnets is greater than 3 mm.
Further, the first semicircular lower magnetic pole and the second semicircular lower magnetic pole are respectively arranged close to the hall device relative to the first semicircular upper magnetic pole and the second semicircular upper magnetic pole.
The embodiment of the utility model provides a sensor position magnet and hall position sensor, sensor position magnet is applied to hall position sensor, including radial equal first semi-circular magnet and second semi-circular magnet, first semi-circular magnet and second semi-circular magnet are axial polarization magnet, the magnetic pole of first semi-circular magnet includes first semi-circular upper magnetic pole and first semi-circular lower magnetic pole, the magnetic pole of second semi-circular magnet includes second semi-circular upper magnetic pole and second semi-circular lower magnetic pole; the first semicircular upper magnetic pole and the first semicircular lower magnetic pole are opposite in polarity, the second semicircular upper magnetic pole and the second semicircular lower magnetic pole are opposite in polarity, the first semicircular upper magnetic pole and the second semicircular upper magnetic pole are opposite in polarity, and the first semicircular magnet and the second semicircular magnet are identical in specification. The embodiment of the utility model provides a through the semi-circular magnet concatenation with axial polarization for a circular magnet, make the side of circular magnet form closed magnetic line of force, reduce the side drain electrode to guarantee that hall position sensor makes the structure miniaturization under the not influenced circumstances of performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a sensor position magnet according to an embodiment of the present invention;
fig. 2 is a schematic view of a partial structure of a sensor position magnet according to an embodiment of the present invention;
fig. 3 is a schematic view of a magnetic line of force principle of a sensor position magnet according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a positional relationship between a sensor position magnet and a hall device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1 and fig. 2, a sensor position magnet 1 according to an embodiment of the present invention is applied to a hall position sensor, and includes a first semicircular magnet 11 and a second semicircular magnet 12 that are radially and equally divided, where the first semicircular magnet 11 and the second semicircular magnet 12 are axially polarized magnets, a magnetic pole of the first semicircular magnet 11 includes a first semicircular upper magnetic pole 111 and a first semicircular lower magnetic pole 112, and a magnetic pole of the second semicircular magnet 12 includes a second semicircular upper magnetic pole 121 and a second semicircular lower magnetic pole 122;
the first semicircular upper magnetic pole 111 and the first semicircular lower magnetic pole 112 have opposite polarities, the second semicircular upper magnetic pole 121 and the second semicircular lower magnetic pole 122 have opposite polarities, the first semicircular upper magnetic pole 111 and the second semicircular upper magnetic pole 121 have opposite polarities, and the first semicircular magnet 11 and the second semicircular magnet 12 have the same specification.
In this embodiment, the sensor position magnet 1 is formed by splicing the first semicircular magnet 11 and the second semicircular magnet 12 from left to right, and the first semicircular sub-magnet 11 and the second semicircular sub-magnet are both axially polarized magnets, so that the magnetic poles of the first semicircular magnet are located at the upper and lower ends of the first semicircular magnet, and the magnetic poles of the second semicircular magnet are also located at the upper and lower ends of the second semicircular magnet. It should be noted that the first semicircular upper magnetic pole 111 and the first semicircular lower magnetic pole 112 have opposite polarities, the second semicircular upper magnetic pole 121 and the second semicircular lower magnetic pole 122 have opposite polarities, the first semicircular upper magnetic pole 111 and the second semicircular upper magnetic pole 121 have opposite polarities, and similarly, the first semicircular lower magnetic pole 112 and the second semicircular lower magnetic pole 122 have opposite polarities. The axial polarization means that the magnetic poles of the magnet are polarized in the direction of the magnet axis so that the magnetic poles of the magnet appear on both the upper and lower sides of the magnet.
Usually, a plurality of sensor position magnets 1 are arranged in the hall position sensor (a magnetic field sensor for detecting the position of an object, which is used for detecting a magnetic field and changes thereof), and in the prior art, the sensor position magnets are usually magnetized in a radial direction, even though magnetic poles are positioned at the left side and the right side of the magnet, so that a large amount of generated magnetic lines are distributed at two ends of the magnetic poles, and most of the magnetic circuits are in an open loop, so that a larger magnetic force is applied to the adjacent sensor position magnets. In order to reduce or avoid magnetic interaction between adjacent sensor site magnets, it is generally preferred to increase the distance between the sensor site magnets.
Referring to fig. 3, in the present embodiment, due to the adoption of the axially polarized sensor position magnet 1, the magnetic poles of the sensor position magnet 1 are located at the upper and lower sides of the sensor position magnet 1, so that the side surface of the sensor position magnet 1 can generate closed magnetic lines of force, and further the side surface magnetic flux leakage is greatly reduced, that is, the magnetic force action between the adjacent sensor position magnets 1 is greatly reduced, so that the distance between the adjacent sensor position magnets 1 does not need to be increased, and the miniaturization of the hall position sensor is facilitated. In a specific application scenario, the sensor position magnet 1 provided in this embodiment can reduce the magnetic force action between adjacent sensor position magnets 1 to 1/10 of the magnetic force action in the prior art.
In addition, because the magnetic force lines on the side surface of the sensor position magnet 1 form a closed loop, and the magnetic leakage on the side surface is smaller, the Hall position sensor is allowed to be arranged at a closer distance between the adjacent Hall devices 2 in an application environment containing a plurality of Hall devices 2, the miniaturization of the Hall position sensor is realized, and the manufactured Hall position sensor can double the volume of the traditional potentiometer and has higher performance and service life.
In one embodiment, the thickness of each of the first semicircular magnet 11 and the second semicircular magnet 12 is 0.5mm to 1.5 mm.
In this embodiment, the thickness of the first semicircular magnet and the thickness of the second semicircular magnet are set to be 0.5mm to 1.5mm, that is, the overall thickness of the sensor position magnet 1 is set to be 0.5mm to 1.5mm, so that the volume of the sensor position magnet 1 only occupies a part of the space of the hall position sensor, and the influence on other components and circuit design in the hall position sensor is avoided. In a specific application scenario, when the overall thickness of the sensor position magnet 1 is greater than 1.5mm, the internal circuit design of the hall position sensor is affected, so that the structure of the hall position sensor is increased, and the miniaturization of the hall position sensor is not facilitated.
Further, in a specific embodiment, the thickness of each of the first semicircular magnet and the second semicircular magnet is 1 mm.
In one embodiment, the first semicircular magnet 11 and the second semicircular lower magnet 12 each have a diameter of 3mm to 6 mm.
In this embodiment, the first semicircular magnet 11 and the second semicircular magnet are spliced to form a complete circle, which is convenient for assembling and producing the hall sensor.
Further, the diameters of the first semicircular magnet 11 and the second semicircular lower magnet 12 are set to be 5mm, so that the space occupied by the sensor position magnet 1 in the hall position sensor is sufficiently small while the sensor position magnet 1 is ensured to generate a magnetic force satisfying the measurement.
In one embodiment, the polarity of the first semicircular upper magnetic pole 111 is N-pole, and the polarity of the first semicircular lower magnetic pole 112 is S-pole.
In this embodiment, the polarity of the first semicircular upper magnetic pole 111 is set to be N-pole, and correspondingly, the polarity of the first semicircular lower magnetic pole 112 is S-pole. Since the polarity of the first semicircular upper magnetic pole 111 is opposite to the polarity of the second semicircular upper magnetic pole 121, the polarity of the second semicircular upper magnetic pole 121 is S-pole, and correspondingly, the polarity of the second semicircular lower magnetic pole 122 is N-pole.
The embodiment also provides a hall position sensor, as shown in fig. 4, which comprises a hall device 2 and a sensor position magnet 1 located above the hall device 2.
The Hall position sensor is a magnetic field sensor for detecting the position of an object. The hall position sensor can detect a magnetic field and changes thereof, and the hall device 2 is a semiconductor magnetoelectric device and works by utilizing a hall effect.
In the hall position sensor, the sensor position magnet 1 adopts axial polarization, so that the magnetic pole directions (located at the upper side and the lower side of the sensor position magnet 1) are adjusted to a plane parallel to the hall device 2, namely, on the detection plane of the hall device 2, and the magnetic field intensity of the detection area of the hall device 2 is more uniform and the magnetic field distance is larger.
In one embodiment, the height between the sensor position magnet 1 and the hall device 2 is 0.5mm to 7 mm.
In the prior art, because the sensor position magnet needs to be magnetized in the radial direction, and the magnetic poles are positioned at the left side and the right side of the sensor position magnet, the magnetic field distance of the detection area of the Hall device is smaller, and is usually 0.5 mm-3 mm.
In this embodiment, in the hall position sensor, the magnetic pole direction of the sensor position magnet 1 is adjusted to a plane parallel to the hall device 2, so that the magnetic field distance of the detection area of the hall device 2 can be made larger, and in a specific application scenario, the magnetic field distance of the detection area of the hall device 2 is 0.5mm to 7mm, that is, the height between the sensor position magnet 1 and the hall device 2 can be set to 0.5mm to 7 mm.
In one embodiment, a plurality of hall devices 2 are included, and the sensor position magnet 1 is disposed above each hall device 2.
This embodiment is through set up a plurality of hall device 2 and sensor position magnet 1 in the hall position sensor to can improve hall position sensor's detectability and interference killing feature etc. make the testing result more accurate.
In one embodiment, the distance between adjacent sensor position magnets 1 is greater than 3 mm.
In the prior art, in order to reduce the magnetic interference between adjacent sensor position magnets, the distance between adjacent sensor position magnets is generally increased (generally more than 10mm), which is not beneficial to the miniaturization of the sensor.
In the embodiment, since the sensor position magnet 1 is an axially polarized magnet, the magnetic lines of force generated by the sensor position magnet 1 on both sides are closed magnetic lines of force, and the magnetic interference with the adjacent sensor position magnet 1 is much smaller than that in the prior art, so that the distance between the adjacent sensor magnets 1 does not need to be increased.
In a specific application scenario, setting the distance between adjacent sensor position magnets 1 to be greater than 3mm ensures that the sensor position magnets 1 are not interfered by the magnetic force of the adjacent sensor position magnets 1, or the magnetic force interference is equivalent to the magnetic force interference generated when the distance between the adjacent sensor position magnets is greater than 10mm in the prior art.
In one embodiment, the first and second semicircular lower magnetic poles are disposed adjacent to the hall device 2 with respect to the first and second semicircular upper magnetic poles, respectively.
In the present embodiment, since the sensor position magnet 1 is located above the hall device 2, the first and second semicircular lower magnetic poles 112 and 122 are closer to the hall device 2 than the first and second semicircular upper magnetic poles 111 and 121, respectively. Of course, in other embodiments, if the sensor position magnet 1 is located below the hall device 2, the first and second semicircular upper magnetic poles 111 and 121 are closer to the hall device 2 than the first and second semicircular lower magnetic poles 112 and 122, respectively.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A sensor position magnet is applied to a Hall position sensor and is characterized by comprising a first semicircular magnet and a second semicircular magnet which are radially and evenly divided, wherein the first semicircular magnet and the second semicircular magnet are axially polarized magnets, the magnetic poles of the first semicircular magnet comprise a first semicircular upper magnetic pole and a first semicircular lower magnetic pole, and the magnetic poles of the second semicircular magnet comprise a second semicircular upper magnetic pole and a second semicircular lower magnetic pole;
the first semicircular upper magnetic pole and the first semicircular lower magnetic pole are opposite in polarity, the second semicircular upper magnetic pole and the second semicircular lower magnetic pole are opposite in polarity, the first semicircular upper magnetic pole and the second semicircular upper magnetic pole are opposite in polarity, and the first semicircular magnet and the second semicircular magnet are identical in specification.
2. The sensor position magnet according to claim 1, wherein the first and second semicircular magnets each have a thickness of 0.5mm to 1.5 mm.
3. The sensor position magnet according to claim 1, wherein the first and second semicircular magnets each have a diameter of 3mm to 6 mm.
4. The sensor-position magnet according to claim 1, wherein the first semicircular upper magnetic pole has a polarity of N-pole and the first semicircular lower magnetic pole has a polarity of S-pole.
5. The sensor position magnet according to claim 2, wherein the first and second semicircular magnets have a thickness of 1 mm.
6. A Hall position sensor comprising a Hall device and the sensor position magnet of any one of claims 1 to 5 located above the Hall device.
7. The hall position sensor of claim 6 wherein the height between the sensor position magnet and the hall device is between 0.5mm and 7 mm.
8. The hall position sensor of claim 6 which comprises a plurality of hall devices, and wherein the sensor position magnet is disposed above each hall device.
9. The hall position sensor of claim 8 wherein the distance between adjacent sensor position magnets is greater than 3 mm.
10. The Hall position sensor of claim 6, wherein the first and second semicircular lower poles are disposed proximate to the Hall device with respect to the first and second semicircular upper poles, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021857683.XU CN212674174U (en) | 2020-08-31 | 2020-08-31 | Sensor position magnet and Hall position sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021857683.XU CN212674174U (en) | 2020-08-31 | 2020-08-31 | Sensor position magnet and Hall position sensor |
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| CN212674174U true CN212674174U (en) | 2021-03-09 |
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| CN202021857683.XU Active CN212674174U (en) | 2020-08-31 | 2020-08-31 | Sensor position magnet and Hall position sensor |
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