CN218066289U - Distance measuring device of permanent magnet electromagnetic hybrid system - Google Patents
Distance measuring device of permanent magnet electromagnetic hybrid system Download PDFInfo
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- CN218066289U CN218066289U CN202220920093.XU CN202220920093U CN218066289U CN 218066289 U CN218066289 U CN 218066289U CN 202220920093 U CN202220920093 U CN 202220920093U CN 218066289 U CN218066289 U CN 218066289U
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 48
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 26
- 230000005389 magnetism Effects 0.000 claims description 6
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 4
- 229910000828 alnico Inorganic materials 0.000 claims description 4
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 4
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- 239000000725 suspension Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model provides a distance measuring device of a permanent magnetic electromagnetic hybrid system, which comprises an electromagnet and a permanent magnet; the distance measuring device includes: the at least two linear Hall elements are arranged on the adsorption surface of the electromagnet at intervals, one linear Hall element is positioned in the middle of the adsorption surface and opposite to the permanent magnet, and the at least two linear Hall elements are used for acquiring a magnetic field intensity electric signal of a mixed magnetic field obtained by superposing a permanent magnetic field excited by the permanent magnet and an electromagnetic field excited by exciting current in the electromagnet; and the signal compensation module is electrically connected with each linear Hall element and is used for compensating the magnetic field intensity electric signal of the mixed magnetic field to offset the influence from the electromagnetic field and outputting the compensated magnetic field intensity electric signal only related to the permanent magnetic field so as to represent the distance between the electromagnet and the permanent magnet. The utility model discloses can effectively reduce among the measurement process that the permanent magnet sways, the side is inclined to one side to the influence of distance signal, improve the degree of accuracy that the distance detected.
Description
Technical Field
The utility model relates to a distance detection technical field specifically relates to a range unit of permanent magnetism electromagnetic hybrid system.
Background
In the permanent-magnet electromagnetic hybrid suspension system, in order to realize stable suspension of the hybrid suspension system, the distance between the permanent magnet and the electromagnet needs to be acquired in real time to realize dynamic balance control of the hybrid suspension system. In the prior art, technologies such as laser ranging, infrared sensor ranging, ultrasonic ranging, light shielding ranging, and linear hall element ranging are generally used. Although the laser ranging has high precision, the unit price is expensive and the cost is high; compared with laser ranging, the infrared sensor ranging has lower cost and is greatly influenced by an environmental light source; the ultrasonic ranging precision is low, and the ultrasonic generator is large in size and is not suitable for use; the distance measurement structure of the light shielding method is complex and has low precision, and the use requirement cannot be met; the linear Hall element has low unit price and high sensitivity, so the existing hybrid suspension system usually adopts the linear Hall element as a distance detection element. However, the linear hall element is easily affected by the electromagnetic field generated by the electromagnet, so that the measurement result is biased, and therefore the problem needs to be solved to improve the measurement accuracy.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a range unit of permanent magnetism electromagnetic hybrid system, this equipment receive the electromagnetic field influence that the electro-magnet produced, make the measuring result produce the problem of deviation easily when being used for solving foretell current linear hall element measuring distance.
In order to achieve the above object, an embodiment of the present invention provides a distance measuring device of a permanent magnetic and electromagnetic hybrid system, where the permanent magnetic and electromagnetic hybrid system includes an electromagnet and a permanent magnet, a bottom surface of the electromagnet is a horizontal adsorption surface, and the permanent magnet is located under the electromagnet and does not contact with the electromagnet; the range unit of permanent magnetism electromagnetic hybrid system includes:
the at least two linear Hall elements are arranged on the adsorption surface of the electromagnet at intervals, one linear Hall element is positioned in the middle of the adsorption surface and is opposite to the permanent magnet, and the at least two linear Hall elements are used for acquiring a magnetic field intensity electric signal of a mixed magnetic field obtained by superposing a permanent magnetic field excited by the permanent magnet and an electromagnetic field excited by exciting current in the electromagnet;
and the signal compensation module is electrically connected with each linear Hall element and used for compensating the magnetic field intensity electric signal of the mixed magnetic field so as to offset the influence from the electromagnetic field and outputting the compensated magnetic field intensity electric signal only related to the permanent magnetic field so as to represent the distance between the electromagnet and the permanent magnet.
Optionally, the electromagnet is an E-type electromagnet.
Optionally, the electromagnet is an electromagnetic chuck.
Optionally, the permanent magnet is a neodymium iron boron permanent magnet, a samarium cobalt permanent magnet or an alnico permanent magnet, and the permanent magnet is in the shape of a cylinder, a cuboid or an annular body.
Optionally, the quantity of linear hall element is three, is a style of calligraphy equidistance interval arrangement on the adsorption plane, and the linear hall element of intermediate position is located the adsorption plane centre position and with the permanent magnet position is relative.
Optionally, the number of the linear hall elements is five, one of the linear hall elements is located in the center of the adsorption surface and opposite to the permanent magnet, and the other four linear hall elements are arranged on the periphery of the adsorption surface in an equidistant and rotationally symmetrical manner.
Optionally, the signal compensation module is a digital controller.
Optionally, the signal compensation module is an analog circuit.
Optionally, the analog circuit includes: the input signal processing module and the parameter adjusting module are sequentially connected in series;
the input signal processing module comprises at least two first operational amplifiers, the output end of each first operational amplifier is connected with the input end of the parameter adjusting module through a first resistor, the homodromous input end of each first operational amplifier is connected with the output end of the corresponding linear Hall element, and the reverse input end of each first operational amplifier is connected with the respective output end;
the parameter adjustment module includes second operational amplifier and the third operational amplifier of establishing ties each other, the reverse input end of second operational amplifier is connected the output of input signal processing module and still through second resistance connection the output of second operational amplifier, adjustable potentiometer is connected to the syntropy input of second operational amplifier, the output of second operational amplifier is connected the syntropy input of third operational amplifier, the reverse input end of third operational amplifier is connected the output of third operational amplifier, the signal of telecommunication of magnetic field intensity after the output compensation of third operational amplifier.
Optionally, the apparatus further comprises: and the power supply module is connected with the electromagnet, the linear Hall element and the signal compensation module and used for supplying power to the electromagnet, the linear Hall element and the signal compensation module.
According to the technical scheme, the magnetic field intensity electric signal of the mixed magnetic field formed by the superposition of the permanent magnetic field and the electromagnetic field is obtained through at least two linear Hall elements, the signal compensation module is utilized to compensate the magnetic field intensity electric signal of the mixed magnetic field so as to counteract the influence from the electromagnetic field and output the compensated magnetic field intensity electric signal only related to the permanent magnetic field, so that the distance between the electromagnet and the permanent magnet is represented, the interference of the electromagnetic field on the linear Hall elements is avoided, the signal measurement is more accurate, and the distance detection precision is improved; in addition, the influence of permanent magnet swing and lateral deviation on distance signals in the measuring process can be effectively reduced and the accuracy of distance detection is improved by arranging at least three linear Hall elements.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments, but do not limit the embodiments. In the drawings:
fig. 1 is a schematic structural diagram of a distance measuring device of a first permanent-magnet electromagnetic hybrid system provided by the present invention;
fig. 2 is a schematic structural diagram of a part of a distance measuring device of a first permanent magnetic and electromagnetic hybrid system provided by the present invention;
fig. 3 is a schematic structural diagram of a distance measuring device of a second permanent magnetic and electromagnetic hybrid system provided by the present invention;
fig. 4 is a schematic structural diagram of a part of a distance measuring device of a second permanent-magnet electromagnetic hybrid system provided by the present invention;
fig. 5 is a schematic structural diagram of a signal compensation module of a distance measuring device of a permanent magnetic electromagnetic hybrid system according to the present invention;
fig. 6 is a schematic diagram of the relationship between the compensated magnetic field strength electrical signal and the distance between the electromagnet and the permanent magnet.
Description of the reference numerals
1-an electromagnet; 2-a permanent magnet; 3-a linear hall element;
4-a signal compensation module; 41-input signal processing module; 42-a parameter adjustment module;
411 — first operational amplifier; 412-a first resistance; 421-a second operational amplifier;
422-a third operational amplifier; 423-a second resistance; 424-Adjustable potentiometer.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is provided for purposes of illustration and explanation, and is not intended to limit the embodiments of the invention.
In the embodiments of the present invention, without the contrary explanation, the terms of orientation such as "upper, lower, left, and right" used herein generally refer to the orientation or position relationship shown in the drawings, or the orientation or position relationship that the utility model is usually placed when in use.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.
The terms "horizontal", "vertical", "overhanging", and the like do not imply a requirement that the components be absolutely horizontal, vertical or overhanging, but may be somewhat inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially", "essentially", and the like are intended to indicate that the relative terms are not required to be absolutely exact, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", "essentially", and the like are used in a similar manner to those described above.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic structural diagram of a distance measuring device of a first permanent-magnet electromagnetic hybrid system provided by the present invention; fig. 2 is a schematic structural diagram of a part of a distance measuring device of a first permanent-magnet electromagnetic hybrid system provided by the present invention; fig. 3 is a schematic structural diagram of a distance measuring device of a second permanent-magnet electromagnetic hybrid system provided by the present invention; fig. 4 is a schematic structural diagram of a part of a distance measuring device of a second permanent-magnet electromagnetic hybrid system provided by the present invention.
As shown in fig. 1-4, the embodiment of the present invention provides a distance measuring device for a permanent magnetic and electromagnetic hybrid system, where the permanent magnetic and electromagnetic hybrid system includes an electromagnet 1 and a permanent magnet 2, the bottom surface of the electromagnet 1 is a horizontal adsorption surface, and the permanent magnet 2 is located under the electromagnet 1 and does not contact with the electromagnet 1; the range unit of permanent magnetism electromagnetic hybrid system includes:
the at least two linear Hall elements 3 are arranged on the adsorption surface of the electromagnet 1 at intervals, one linear Hall element 3 is located in the middle of the adsorption surface and opposite to the permanent magnet 2, and the at least two linear Hall elements 3 are used for acquiring a magnetic field intensity electric signal of a mixed magnetic field obtained by superposing a permanent magnetic field excited by the permanent magnet 2 and an electromagnetic field excited by exciting current in the electromagnet 1;
the signal compensation module 4 is electrically connected with each linear hall element 3, and is used for compensating the magnetic field strength electric signal of the mixed magnetic field to counteract the influence from the electromagnetic field, and outputting the compensated magnetic field strength electric signal only related to the permanent magnetic field, so as to represent the distance between the electromagnet 1 and the permanent magnet 2;
specifically, the electromagnet 1 includes an iron core and a coil. Exciting current is introduced into the coil to enable the electromagnet 1 to generate an electromagnetic field, and the direction of the magnetic field is determined by the direction of the exciting current; at the same time, the permanent magnet 2 generates a permanent magnetic field. The interaction between the permanent magnetic field and the iron core of the electromagnet 1 and the electromagnetic field can generate magnetic field acting force between the permanent magnet 2 and the electromagnet 1. The number of the linear hall elements 3 is determined according to actual use conditions, and can be set to be two to five or more different, and the linear hall elements are arranged according to a certain rule, and one of the linear hall elements 3 is ensured to be positioned in the center of the adsorption surface. After linear hall element 3 obtained the magnetic field intensity signal of hybrid magnetic field, signal compensation module 4 can adopt digital controller, also can adopt analog circuit, right the magnetic field intensity signal of hybrid magnetic field compensates, in order to offset the influence that comes from electromagnetic field, and output only with the magnetic field intensity signal after the compensation that permanent magnetic field is relevant, be used for the representation electromagnet 1 with distance between the permanent magnet 2.
More specifically, the signal compensation module 4 may determine the actual distance between the permanent magnet 2 and the electromagnet 1 again according to the functional relationship between the distance and the compensated electric signal of the magnetic field strength.
In another embodiment, the apparatus further comprises: and the power supply module is connected with the electromagnet 1, the linear Hall element 3 and the signal compensation module 4 and used for supplying power to the electromagnet 1, the linear Hall element 3 and the signal compensation module 4.
More specifically, the power supply (not shown) may be provided with a power supply for individually supplying power to the electromagnet 1, the linear hall element 3, or the signal compensation module 4, which may be a single power supply, and specifically includes a disposable battery, a rechargeable battery, or the like as the power supply.
Furthermore, the utility model discloses based on following principle implementation:
according to the principle of linear superposition of magnetic fields, the mixed magnetic field obtained by the linear Hall element 3 can be linearly decomposed into a permanent magnetic field B Permanent magnet And an electromagnetic field B Electric power (ii) a Wherein, the permanent magnetic field B Permanent magnet Influenced by the distance h between the electromagnet 1 and the permanent magnet 2 and the magnetization degree alpha of the iron core of the electromagnet 1 near the linear hall element 3; electromagnetic field B Electricity Is influenced by the exciting current I of the electromagnet 1 and the position coefficient β of the linear hall element 3. Since the permanent magnet 2 cannot be further magnetized or demagnetized, the permanent magnetic field B Permanent magnet Independent of the excitation current I; the linear hall elements 3 are in positive correlation under the influence of an electromagnetic field and are represented by a position coefficient beta, and the position coefficient beta is a constant and is irrelevant to the exciting current I and the distance h.
In summary, the hybrid magnetic field obtained by each linear hall element 3 has the following functional relationship:
B 0 ＝B permanent magnet (h)+B Electric power (I)
B i ＝α i (h)B Permanent magnet (h)+β i B Electric power (I)
Wherein beta is i Is constant, can directly measure and measure the electromagnetic field B Electricity Compensation is performed. Let the compensated magnetic field B After compensation Is expressed as follows:
from the above formula, the compensated magnetic field B After compensation The distance between the permanent magnet 2 and the electromagnet 1 can be characterized independently of the excitation current I, but only in relation to the distance h.
Further, the electromagnet 1 is an E-type electromagnet 1 or an electromagnetic chuck.
Specifically, the electromagnet 1 can adopt an E-shaped electromagnet or an electromagnetic chuck, and when the E-shaped electromagnet is adopted, the opening end of the electromagnet is vertically downward and is arranged opposite to the permanent magnet 2; in addition, when the E-shaped electromagnet is adopted, three linear Hall elements 3 can be arranged, one linear Hall element 3 is positioned in the center of the adsorption surface of the E-shaped electromagnet, and the three linear Hall elements 3 are arranged on the iron core of the E-shaped electromagnet in a straight line shape; when the electromagnetic chuck is adopted, the linear Hall elements 3 are arranged in five, one linear Hall element 3 is positioned in the center of the adsorption surface of the electromagnetic chuck, and the other four linear Hall elements 3 are arranged on the adsorption surface of the electromagnetic chuck in an equidistant and rotationally symmetrical manner.
Further, permanent magnet 2 is neodymium iron boron permanent magnet, samarium cobalt permanent magnet or alnico permanent magnet, permanent magnet 2's shape is cylinder, cuboid or the ring body.
Specifically, the permanent magnet 2 may be a permanent magnet having a relatively strong magnetism, such as a neodymium-iron-boron permanent magnet, a samarium-cobalt permanent magnet, or an alnico permanent magnet, and may be in the shape of a cylinder, a rectangular parallelepiped, or an annular body, and may be specifically determined according to an actual use environment.
Further, linear hall element 3's quantity 3 is three, is a style of calligraphy equidistance interval arrangement and is in on the adsorption plane, and the linear hall element 3 of intermediate position is located adsorption plane centre position and with 2 relative positions in position of permanent magnet.
Specifically, as shown in fig. 1-2, when three linear hall elements 3 are provided, one of the linear hall elements 3 is located in the center of the attraction surface of the electromagnet 1, and the three linear hall elements 3 are equidistantly and symmetrically distributed, and most preferably, a straight arrangement mode can be adopted, so that the influence of the swing and the lateral offset of the permanent magnet 2 on the distance signal in the measurement process can be effectively reduced, the accuracy of distance detection is improved, and when three linear hall elements 3 are provided, the linear hall elements can be applied to an E-type electromagnet.
Further, the number of the linear hall elements 3 is five, one of the linear hall elements 3 is located in the center of the adsorption surface and opposite to the permanent magnet 2, and the other four linear hall elements 3 are arranged on the periphery of the adsorption surface in an equidistant and rotationally symmetrical manner.
Specifically, as shown in fig. 3-4, when the number of the linear hall elements 3 is five, one of the linear hall elements 3 is located in the center of the attraction surface of the electromagnet 1, and the other four linear hall elements 3 are distributed on the attraction surface of the electromagnet 1 in an equidistant and rotationally symmetric manner and located on the periphery of the attraction surface, and the distances between the four linear hall elements 3 and the linear hall element 3 located in the center of the attraction surface of the electromagnet 1 are equal, by adopting the setting mode, the influences of the swing and the lateral offset of the permanent magnet 2 on the distance signal in the measurement process can be effectively reduced, the accuracy of distance detection is improved, and the linear hall element 3 can be applied to the electromagnetic chuck when the number of the linear hall element 3 is five.
Further, the signal compensation module 4 is a digital controller, and the digital controller calculates the compensated magnetic field strength electric signal by using the following formula:
wherein, U After compensation The compensated magnetic field intensity electric signal is obtained; u shape 0 The magnetic field intensity electric signal of the mixed magnetic field is obtained by a linear Hall element positioned in the middle of the adsorption plane; k is a compensation factor, U Zero setting Is the zeroing coefficient; i is positionThe ith linear Hall element is arranged on the periphery of the adsorption surface, and i is more than or equal to 1; n is the number of linear Hall elements positioned on the periphery of the adsorption surface; u shape i Electric signal of magnetic field intensity of mixed magnetic field obtained for linear Hall element located at periphery of adsorption surface
In particular, when the signal compensation module 4 is a digital controller, a compensation formula is adopted
And compensating the input magnetic field intensity electric signal of the mixed magnetic field to offset the influence from the electromagnetic magnetic field, and outputting the compensated magnetic field intensity electric signal only related to the permanent magnetic field so as to represent the distance between the electromagnet 1 and the permanent magnet 2.
Further, the signal compensation module 4 is an analog circuit;
the analog circuit includes: an input signal processing module 41 and a parameter adjusting module 42 which are connected in series in sequence;
the input signal processing module 41 includes at least two first operational amplifiers 411, an output terminal of each first operational amplifier 411 is connected to an input terminal of the parameter adjusting module 42 through a first resistor 412, a homodromous input terminal of each first operational amplifier 411 is connected to an output terminal of the corresponding linear hall element 3, and an inverting input terminal of each first operational amplifier 411 is connected to its respective output terminal;
Specifically, fig. 5 is a schematic structural diagram of a signal compensation module of a distance measuring device of a permanent magnetic-electromagnetic hybrid system, as shown in fig. 5, five linear hall elements 3 are provided in this embodiment, the analog circuit includes an input signal processing module 41 and a parameter adjusting module 42 which are sequentially connected in series, the input signal processing module 41 includes five first operational amplifiers 411, an output end of each first operational amplifier 411 is connected to an input end of the parameter adjusting module 42 through a first resistor 412, a same-direction input end of each first operational amplifier 411 is connected to an output end of the corresponding linear hall element 3, and a reverse input end of each first operational amplifier 411 is connected to a respective output end; parameter adjustment module 42 includes second operational amplifier 421 and third operational amplifier 422 that establish ties each other, the reverse input end of second operational amplifier 421 is connected input signal processing module 41's output and still connect through second resistance 423 the output of second operational amplifier 421, adjustable potentiometer 424 is connected to the syntropy input of second operational amplifier 421, the output of second operational amplifier 421 is connected the syntropy input of third operational amplifier 422, the reverse input of third operational amplifier 422 is connected the output of third operational amplifier 422, the signal of telecommunication after the output compensation of third operational amplifier 422. The number of the first operational amplifier 411 and the first resistor 412 is the same as that of the linear hall elements 3, and the first resistor 412 and the second resistor 423 can both adopt a sliding rheostat, a rheostat box and the like; furthermore, the first resistor 412 corresponding to the linear hall element 3 located at the center of the adsorption plane is a sliding rheostat, and the first resistor 412 corresponding to the linear hall element 3 located at the periphery of the adsorption plane may be a fixed-resistance resistor; in addition, the sensitivity of the analog circuit to the permanent magnetic field can be adjusted by adjusting the resistance value of the second resistor 423; by adjusting the adjustable potentiometer 424, zeroing of the analog circuit may be achieved.
In the present embodiment, VR is the first resistor 412 corresponding to the linear hall element 3 located at the center of the suction surface 0 First resistors 412 corresponding to the peripheral linear hall elements 3, respectivelyIs R 1 、R 2 、R 3 、R 4 . In practical applications, the first resistors 412 of the peripheral linear hall elements 3 are set to the same resistance value.
Specifically, signal compensation is performed by an analog circuit.
Taking the example of providing five linear hall elements 3, five magnetic field strength electrical signals are respectively obtained: u shape 0 、U 1 、U 2 、U 3 And U 4 (ii) a Wherein, U 0 The magnetic field intensity electric signal of the mixed magnetic field obtained by the linear Hall element 3 positioned in the center of the adsorption plane is greatly influenced by the permanent magnetic field; u shape 1 、U 2 、U 3 、U 4 The other four linear hall elements 3 arranged on the periphery of the adsorption surface respectively obtain magnetic field intensity electric signals of the mixed magnetic field, and the four linear hall elements 3 are in equidistant rotational symmetry geometrically and are less influenced by the permanent magnetic field.
The analog circuit is intended to cancel the influence from the electromagnetic field by having a linear relationship between the electric signals of the magnetic field strength of the electromagnetic field acquired by the plurality of linear hall elements 3, and to output the electric signal of the magnetic field strength after compensation only relating to the permanent magnetic field. When the linear hall elements 3 are disposed on the attraction surface of the electromagnet 1 in the same direction (when the working surface of the linear hall elements 3 is directed toward the electromagnet 1), the electromagnetic field acts on the U-shaped magnetic field 0 To U 1 、U 2 、U 3 、U 4 Of opposite influence, e.g. U 0 While increasing, U 1 、U 2 、U 3 、U 4 And decrease.
The following relationship can be obtained from circuit analysis with respect to the second operational amplifier 421:
wherein R is 1 ＝R 2 ＝R 3 ＝R 4 . The method is further simplified and can be obtained,
wherein, U After compensation Is the compensated magnetic field strength electrical signal output by the third operational amplifier;
is U 0 And with
The sensitivity between the analog circuit and the analog circuit can be regarded as a compensation coefficient of the analog circuit; u shape Zero setting Is a zeroing coefficient, generated by an adjustable potentiometer.
From the above formula, fine-tuning VR 0 Can counteract the electromagnetic field to U After compensation The influence of (a); fine tuning VR Second one The sensitivity of the analog circuit to the permanent magnetic field can be adjusted; fine tuning U Zero setting The output signal of the analog circuit can be zeroed.
Example 1
As shown in fig. 1-2, in the present embodiment, the electromagnet 1 is an E-type electromagnet; the permanent magnet 2 is a cuboid; three linear Hall elements 3 are arranged on the adsorption surface of the E-shaped electromagnet, the three linear Hall elements 3 are arranged on the adsorption surface in a linear shape at equal intervals, and the linear Hall element 3 in the middle position is positioned in the middle of the adsorption surface and is opposite to the permanent magnet 2; the signal compensation module 4 is arranged on the adsorption surface. By the method, signal detection is performed, the influence of the swing and the lateral deviation of the permanent magnet 2 on the distance signal in the measuring process can be effectively reduced, and the accuracy of distance detection is improved.
Example 2
As shown in fig. 3-4, in the present embodiment, the electromagnet 1 is an electromagnetic chuck; the permanent magnet 2 is a cylinder; five linear hall elements 3 are arranged on the adsorption surface of the electromagnetic chuck, wherein one linear hall element 3 is positioned in the center of the adsorption surface of the electromagnet 1, the other four linear hall elements 3 are equidistantly and rotationally symmetrically distributed on the adsorption surface of the electromagnet 1 and are positioned on the periphery of the adsorption surface, and the distances between the four linear hall elements 3 and the linear hall element 3 positioned in the center of the adsorption surface of the electromagnet 1 are equal; the signal compensation module 4 is arranged on the adsorption surface. By the method, signal detection is performed, the influence of the permanent magnet 2 swing and lateral deviation on distance signals in the measuring process can be effectively reduced, and the accuracy of distance detection is improved.
Example 3
Fig. 6 is a schematic diagram illustrating the relationship between the compensated electric signal of magnetic field intensity and the distance between the electromagnet and the permanent magnet; as shown in fig. 6, in this embodiment, the signal compensation module 4 is an analog circuit, the distance measuring device includes five linear hall elements 3, one of the linear hall elements 3 is located at the center of the adsorption surface and opposite to the permanent magnet 2, and the other four linear hall elements 3 are rotationally symmetrically disposed at the periphery of the adsorption surface at equal intervals. The resistance value of the first resistor 412 corresponding to the peripheral linear hall element 3 is 90 kilo-ohms, and the resistance value of the first resistor 412 corresponding to the linear hall element 3 located at the center of the adsorption plane is 169.2 kilo-ohms. The analog circuit is used for compensating the magnetic field intensity electric signal of the mixed magnetic field acquired by the linear Hall element 3 so as to counteract the influence from the electromagnetic field and output the compensated magnetic field intensity electric signal only related to the permanent magnetic field. Further, the signal compensation module 4 may determine the actual distance between the permanent magnet 2 and the electromagnet 1 according to a functional relationship between the distance and the compensated electric signal of the magnetic field strength, as shown in fig. 6, under the condition of three different excitation currents (0 mA, 100mA, -100 mA), the electric signal of the magnetic field strength after compensation output by the signal compensation module 4 is almost consistent, which indicates that the electric signal of the magnetic field strength after compensation is not influenced by the electromagnetic field any more, and is only related to the permanent magnetic field.
Above has described in detail the optional implementation way of the embodiment of the present invention with reference to the attached drawings, however, the embodiment of the present invention is not limited to the specific details in the above implementation way, and in the technical idea scope of the embodiment of the present invention, it can be to the technical solution of the embodiment of the present invention carry out multiple simple variants, and these simple variants all belong to the protection scope of the embodiment of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.
Claims (10)
1. A distance measuring device of a permanent magnet and electromagnetic hybrid system comprises an electromagnet (1) and a permanent magnet (2), wherein the bottom surface of the electromagnet (1) is a horizontal adsorption surface, and the permanent magnet (2) is positioned under the electromagnet (1) and is not in contact with the electromagnet (1); characterized in that, permanent magnetism electromagnetic hybrid system's range unit includes:
the electromagnet (1) comprises at least two linear Hall elements (3) which are arranged on an adsorption surface of the electromagnet (1) at intervals, wherein one linear Hall element (3) is positioned in the middle of the adsorption surface and is opposite to the permanent magnet (2), and the at least two linear Hall elements (3) are used for acquiring a magnetic field intensity electric signal of a mixed magnetic field obtained by superposing a permanent magnetic field excited by the permanent magnet (2) and an electromagnetic field excited by exciting current in the electromagnet (1);
and the signal compensation module (4) is electrically connected with each linear Hall element (3) and is used for compensating the magnetic field intensity electric signal of the mixed magnetic field so as to offset the influence from the electromagnetic field and outputting the compensated magnetic field intensity electric signal only related to the permanent magnetic field, so that the distance between the electromagnet (1) and the permanent magnet (2) is represented.
2. A ranging device of a permanent magnet electromagnetic hybrid system according to claim 1, characterized in that said electromagnet (1) is an E-type electromagnet.
3. A ranging device of a permanent magnet electromagnetic hybrid system according to claim 1, characterized in that said electromagnet (1) is an electromagnetic chuck.
4. The distance measuring device of the permanent magnet and electromagnetic hybrid system according to claim 1, wherein the permanent magnet (2) is a neodymium-iron-boron permanent magnet, a samarium-cobalt permanent magnet or an alnico permanent magnet, and the permanent magnet (2) is in the shape of a cylinder, a cuboid or an annular body.
5. The distance measuring device of the permanent magnetic electromagnetic hybrid system according to claim 1, wherein the number of the linear hall elements (3) is three, the linear hall elements are arranged on the adsorption surface in a straight line shape at equal intervals, and the middle linear hall element (3) is located in the center of the adsorption surface and opposite to the permanent magnet (2).
6. The ranging device of a permanent magnet electromagnetic hybrid system according to claim 1, wherein the number of the linear hall elements (3) is five, one of the linear hall elements (3) is located at the center of the adsorption plane and opposite to the permanent magnet (2), and the other four linear hall elements (3) are arranged at the periphery of the adsorption plane in an equidistant rotational symmetry manner.
7. Ranging device of a permanent magnetic electromagnetic hybrid system according to claim 1, characterized in that said signal compensation module (4) is a digital controller.
8. Ranging device of a permanent-magnet electromagnetic hybrid system according to claim 1, characterized in that said signal compensation module (4) is an analog circuit.
9. A ranging apparatus of a permanent magnet electromagnetic hybrid system according to claim 8, wherein the analog circuit comprises: the device comprises an input signal processing module (41) and a parameter adjusting module (42) which are sequentially connected in series;
the input signal processing module (41) comprises at least two first operational amplifiers (411), the output end of each first operational amplifier (411) is connected with the input end of the parameter adjusting module (42) through a first resistor (412), the homodromous input end of each first operational amplifier (411) is connected with the output end of the corresponding linear Hall element (3), and the reverse input end of each first operational amplifier (411) is connected with the respective output end;
parameter adjustment module (42) are including second operational amplifier (421) and third operational amplifier (422) of establishing ties each other, the reverse input end of second operational amplifier (421) is connected the output of input signal processing module (41) and still connect through second resistance (423) the output of second operational amplifier (421), adjustable potentiometer (424) is connected to the syntropy input of second operational amplifier (421), the output of second operational amplifier (421) is connected the syntropy input of third operational amplifier (422), the reverse input end of third operational amplifier (422) is connected the output of third operational amplifier (422), the output of third operational amplifier (422) exports the signal of telecommunication after the compensation.
10. A ranging apparatus of a permanent magnet electromagnetic hybrid system according to claim 1, further comprising:
and the power supply module is connected with the electromagnet (1), the linear Hall element (3) and the signal compensation module (4) and used for supplying power to the electromagnet (1), the linear Hall element (3) and the signal compensation module (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220920093.XU CN218066289U (en) | 2022-04-14 | 2022-04-14 | Distance measuring device of permanent magnet electromagnetic hybrid system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220920093.XU CN218066289U (en) | 2022-04-14 | 2022-04-14 | Distance measuring device of permanent magnet electromagnetic hybrid system |
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| CN202220920093.XU Expired - Fee Related CN218066289U (en) | 2022-04-14 | 2022-04-14 | Distance measuring device of permanent magnet electromagnetic hybrid system |
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