CN218066289U - Distance measuring device for permanent magnet electromagnetic hybrid system - Google Patents

Abstract

The utility model provides a distance measuring device of a permanent magnet electromagnetic hybrid system. The permanent magnet electromagnetic hybrid system includes an electromagnet and a permanent magnet; On the adsorption surface, one of the linear Hall elements is located in the middle of the adsorption surface, opposite to the position of the permanent magnet, and at least two linear Hall elements are used to obtain the permanent magnetic field excited by the permanent magnet and the excitation current excited by the electromagnet. The magnetic field strength electric signal of the mixed magnetic field after the electromagnetic field is superimposed; the signal compensation module is electrically connected with each linear Hall element, and is used to compensate the magnetic field strength electric signal of the mixed magnetic field to offset the influence from the electromagnetic field, and output only The compensated magnetic field strength electrical signal associated with the permanent magnetic field to characterize the distance between the electromagnet and the permanent magnet. The utility model can effectively reduce the influence of the swing and side deviation of the permanent magnet on the distance signal during the measurement process, and improve the accuracy of the distance detection.

Description

Distance measuring device for permanent magnet electromagnetic hybrid system

technical field

The utility model relates to the technical field of distance detection, in particular to a distance measuring device of a permanent magnet electromagnetic hybrid system.

Background technique

In the permanent magnet electromagnetic hybrid levitation system, in order to realize the stable levitation of the hybrid levitation system, it is necessary to obtain the distance between the permanent magnet and the electromagnet in real time to realize the dynamic balance control of the hybrid levitation system. In the prior art, technologies such as laser distance measurement, infrared sensor distance measurement, ultrasonic distance measurement, light occlusion method distance measurement and linear Hall element distance measurement are usually used. Among them, laser ranging has high precision, but the unit price is expensive and the cost is high; infrared sensor ranging is less costly than laser ranging, but it is greatly affected by environmental light sources; ultrasonic ranging has low accuracy and the size of the ultrasonic generator is large , is not applicable; the optical occlusion method has a complex ranging structure and low precision, which cannot meet the needs of use; the linear Hall element has a low unit price and high sensitivity, so the existing hybrid suspension system often uses a linear Hall element as a distance detection element. However, the linear Hall element is easily affected by the electromagnetic field generated by the electromagnet, which will cause deviations in the measurement results. Therefore, this problem needs to be solved urgently to improve the measurement accuracy.

Utility model content

The purpose of this utility model embodiment is to provide a distance measuring device of a permanent magnet electromagnetic hybrid system, which is used to solve the problem that the above-mentioned existing linear Hall element is easily affected by the electromagnetic field generated by the electromagnet when measuring distance, making the measurement The result is a problem of bias.

In order to achieve the above object, the embodiment of the present utility model provides a distance measuring device of a permanent magnet electromagnetic hybrid system, the permanent magnet electromagnetic hybrid system includes an electromagnet and a permanent magnet, the bottom surface of the electromagnet is a horizontal adsorption surface, so The permanent magnet is located directly below the electromagnet and is not in contact with the electromagnet; the distance measuring device of the permanent magnet electromagnetic hybrid system includes:

At least two linear Hall elements are arranged at intervals on the adsorption surface of the electromagnet, wherein one linear Hall element is located in the center of the adsorption surface and is opposite to the position of the permanent magnet, and at least two linear Hall elements are used for Obtaining the magnetic field intensity electric signal of the mixed magnetic field after the superposition of the permanent magnetic field excited by the permanent magnet and the electromagnetic field excited by the exciting current in the electromagnet;

The signal compensation module is electrically connected with each linear Hall element, and is used for compensating the magnetic field strength electric signal of the mixed magnetic field to offset the influence from the electromagnetic field, and outputting the compensated magnetic field strength only related to the permanent magnetic field The electric signal is used 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 shape of the permanent magnet is a cylinder, a cuboid or a ring.

Optionally, the number of the linear Hall elements is three, which are arranged on the adsorption surface at equal intervals in a line, and the linear Hall element in the middle position is located in the middle of the adsorption surface and is connected to the adsorption surface. The permanent magnets are located relative to each other.

Optionally, the number of the linear Hall elements is five, and one of the linear Hall elements is located in the middle of the adsorption surface and opposite to the position of the permanent magnet, and the remaining four linear Hall elements are equidistant The rotational symmetry is arranged on the periphery of the adsorption surface.

Optionally, the signal compensation module is a digital controller.

Optionally, the signal compensation module is an analog circuit.

Optionally, the analog circuit includes: an input signal processing module and a parameter adjustment module sequentially connected in series;

The input signal processing module includes at least two first operational amplifiers, the output terminal of each first operational amplifier is connected to the input terminal of the parameter adjustment module through a first resistor, and the same input terminal of each first operational amplifier is connected The output end of the corresponding linear Hall element, the inverting input end of each first operational amplifier is connected to the respective output end;

The parameter adjustment module includes a second operational amplifier and a third operational amplifier connected in series, the inverting input terminal of the second operational amplifier is connected to the output terminal of the input signal processing module and is also connected to the first operational amplifier through a second resistor. The output terminals of the two operational amplifiers, the same input terminal of the second operational amplifier is connected with an adjustable potentiometer, the output terminal of the second operational amplifier is connected with the same input terminal of the third operational amplifier, and the third operational amplifier is connected with the same input terminal of the third operational amplifier. The inverting input terminal of the operational amplifier is connected to the output terminal of the third operational amplifier, and the output terminal of the third operational amplifier outputs a compensated magnetic field strength electric signal.

Optionally, the device further includes: a power supply module, connected to the electromagnet, the linear Hall element and the signal compensation module, for providing power to the electromagnet, the linear Hall element and the The signal compensation module is powered.

In this technical solution, at least two linear Hall elements are used to obtain the electric signal of the magnetic field strength of the mixed magnetic field after the superposition of the permanent magnetic field and the electromagnetic field, and the signal compensation module is used to compensate the electric signal of the magnetic field strength of the mixed magnetic field, To counteract the influence from the electromagnetic field, and output a compensated magnetic field strength electrical signal only related to the permanent magnetic field, to characterize the distance between the electromagnet and the permanent magnet, to avoid the linear Hall element being affected by the The interference of the electromagnetic field makes the signal measurement more accurate and improves the distance detection accuracy; in addition, by setting at least three linear Hall elements, it can effectively reduce the influence of the permanent magnet swing and side deviation on the distance signal during the measurement process, and improve the accuracy of the distance detection Spend.

Other features and advantages of the embodiments of the present invention will be described in detail in the following part of specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the utility model, and constitute a part of the description, and are used together with the following specific embodiments to explain the embodiments of the utility model, but do not constitute a limitation to the embodiments of the utility model. In the attached picture:

Fig. 1 is the structural representation of the distance measuring device of the first kind of permanent magnet electromagnetic hybrid system provided by the utility model;

Fig. 2 is a partial structural schematic diagram of the distance measuring device of the first permanent magnet electromagnetic hybrid system provided by the utility model;

Fig. 3 is the structural representation of the ranging device of the second permanent magnet electromagnetic hybrid system provided by the utility model;

Fig. 4 is a partial structural schematic diagram of the distance measuring device of the second permanent magnet electromagnetic hybrid system provided by the utility model;

Fig. 5 is a schematic structural view of the signal compensation module of the ranging device of the permanent magnet electromagnetic hybrid system provided by the utility model;

Fig. 6 is a schematic diagram of the relationship between the electric signal of the magnetic field strength after compensation and the distance between the electromagnet and the permanent magnet provided by the utility model.

Explanation of reference signs

1-Electromagnet; 2-Permanent magnet; 3-Linear Hall element;

4-signal compensation module; 41-input signal processing module; 42-parameter adjustment module;

411-the first operational amplifier; 412-the first resistor; 421-the second operational amplifier;

422-the third operational amplifier; 423-the second resistor; 424-an adjustable potentiometer.

detailed description

The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present utility model, and are not intended to limit the embodiments of the present utility model.

In the embodiments of the present utility model, unless otherwise stated, the orientation words used such as "up, down, left, right" usually refer to the orientation or positional relationship shown in the drawings, or the utility model The orientation or positional relationship in which the product is usually placed in use.

The terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

The terms "parallel", "perpendicular", etc. do not mean that the components are absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly inclined.

The terms "horizontal", "vertical", "overhanging" and the like do not imply that the part is absolutely horizontal, vertical or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In addition, terms such as "approximately" and "basically" are intended to indicate that the relevant content does not require absolute precision, but may have certain deviations. For example: "approximately equal" does not only mean absolute equality, because it is difficult to achieve absolute "equal" in the actual production and operation process, generally there is a certain deviation. Therefore, in addition to being absolutely equal, "approximately equal to" also includes the above-mentioned situation where there is a certain deviation. Take this as an example, and in other cases, unless otherwise specified, terms such as "approximately" and "basically" have similar meanings to the above.

In the description of the present utility model, it should also be noted that, unless otherwise specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection , can also be detachably connected, or integrally connected; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Fig. 1 is the structural representation of the distance measuring device of the first kind of permanent magnet electromagnetic hybrid system provided by the utility model; Fig. 2 is the partial structural representation of the distance measuring device of the first kind of permanent magnet electromagnetic hybrid system provided by the utility model; Fig. 3 is a schematic structural view of the distance measuring device of the second permanent magnet electromagnetic hybrid system provided by the utility model; FIG. 4 is a partial structural schematic diagram of the distance measuring device of the second permanent magnet electromagnetic hybrid system provided by the utility model.

As shown in Figure 1-4, the embodiment of the utility model provides a distance measuring device of a permanent magnet electromagnetic hybrid system, the permanent magnet electromagnetic hybrid system includes an electromagnet 1 and a permanent magnet 2, and the bottom surface of the electromagnet 1 is A horizontal adsorption surface, the permanent magnet 2 is located directly below the electromagnet 1 and is not in contact with the electromagnet 1; the distance measuring device of the permanent magnet electromagnetic hybrid system includes:

At least two linear Hall elements 3 are arranged at intervals on the adsorption surface of the electromagnet 1, wherein one linear Hall element 3 is located in the center of the adsorption surface and is opposite to the permanent magnet 2, at least two linear Hall elements Hall element 3 is used for obtaining the magnetic field strength electric signal of the mixed magnetic field after the permanent magnetic field excited by described permanent magnet 2 and the electromagnetic field excited by excitation current in described electromagnet 1 are superimposed;

The signal compensation module 4 is electrically connected to each linear Hall element 3, and is used to compensate the magnetic field strength electric signal of the mixed magnetic field to offset the influence from the electromagnetic field, and output the compensated signal only related to the permanent magnetic field. The electric signal of magnetic field strength is used to characterize the distance between the electromagnet 1 and the permanent magnet 2;

Specifically, the electromagnet 1 includes an iron core and a coil. The electromagnet 1 generates an electromagnetic field by feeding the excitation current into the coil, and the direction of the magnetic field is determined by the direction of the excitation 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 a magnetic field force between the permanent magnet 2 and the electromagnet 1 . The number of linear Hall elements 3 is determined according to the actual usage, and can be set to two to five or more, and arranged according to a certain rule, and ensure that one of the linear Hall elements 3 is located in the middle of the adsorption surface. After the linear Hall element 3 obtains the electric signal of the magnetic field strength of the mixed magnetic field, the signal compensation module 4 can use a digital controller or an analog circuit to compensate the electric signal of the magnetic field strength of the mixed magnetic field to offset the electric signal from the electromagnetic field. Affecting and outputting a compensated magnetic field strength electric signal related only to the permanent magnet magnetic field to characterize the distance between the electromagnet 1 and the permanent magnet 2 .

More specifically, the signal compensation module 4 can then determine the actual distance between the permanent magnet 2 and the electromagnet 1 according to the functional relationship between the distance and the compensated magnetic field strength electric signal.

In another embodiment, the device further includes: a power supply module, connected to the electromagnet 1, the linear Hall element 3 and the signal compensation module 4, for supplying power to the electromagnet 1, the The linear Hall element 3 and the signal compensation module 4 are powered.

More specifically, the power supply (not shown) can be set as a whole or a single independent power supply for the electromagnet 1, the linear Hall element 3 or the signal compensation module 4, specifically including a disposable battery, a rechargeable battery, etc. as a power supply .

Further, the utility model is implemented based on the following principles:

According to the principle of linear superposition of the magnetic field, the mixed magnetic field obtained by the linear Hall element 3 can be linearly decomposed into the _permanent magnetic field B _{and the electromagnetic} field B; The influence of the distance h and the magnetization degree α of the iron core of the electromagnet 1 near the linear Hall element 3 ; the electromagnetic field B _{is electrically} affected by the excitation 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 has nothing to do with the excitation current I; there is a positive correlation between multiple linear Hall elements 3 affected by the electromagnetic field, which is characterized by the position coefficient β, and the position coefficient β It is a constant and has nothing to do with the excitation current I and the distance h.

To sum up, the mixed magnetic field obtained by each linear Hall element 3 has the following functional relationship:

B ₀ = B _Yong (h) + B _Electric (I)

B _i ＝α _i (h) B _Yong (h) + β _i B _electricity (I)

Among them, β _i is a constant, which can be directly measured and compensated for the _{electromagnetic} field B. Let the compensated magnetic field B be the following expression _{after compensation} :

It can be seen from the above formula that the compensated magnetic field B has nothing to do with the excitation current I _{after compensation} , but is only related to the distance h, which can represent the distance between the permanent magnet 2 and the electromagnet 1.

Further, the electromagnet 1 is an E-type electromagnet 1 or an electromagnetic chuck.

Specifically, the electromagnet 1 can use an E-type electromagnet or an electromagnetic chuck, and when an E-type electromagnet is used, its open end is vertically downward and arranged relative to the permanent magnet 2; in addition, when an E-type electromagnet is used, the linear Hall There can be three elements 3, and one of the three linear Hall elements is located in the middle of the adsorption surface of the E-type electromagnet, and the three linear Hall elements 3 are arranged in a straight line on the iron core of the E-type electromagnet; When an electromagnetic chuck is used, five linear Hall elements 3 are provided, and one of the linear Hall elements 3 is located in the middle of the adsorption surface of the electromagnetic chuck, and the remaining four linear Hall elements 3 are equidistant and rotationally symmetrically arranged on the electromagnetic chuck. adsorption surface.

Further, the permanent magnet 2 is a neodymium iron boron permanent magnet, samarium cobalt permanent magnet or alnico permanent magnet, and the shape of the permanent magnet 2 is a cylinder, a cuboid or a ring.

Specifically, the permanent magnet 2 can be a permanent magnet with strong magnetic properties such as NdFeB permanent magnet, samarium cobalt permanent magnet or alnico permanent magnet, and the shape can be a shape such as a cylinder, a cuboid or a ring, which can be determined according to actual conditions. The use environment is determined.

Further, the number 3 of the linear Hall elements 3 is three, which are arranged at equal intervals in a line on the adsorption surface, and the linear Hall element 3 in the middle position is located in the middle of the adsorption surface and is connected to the adsorption surface. The permanent magnets 2 are opposite to each other.

Specifically, as shown in Figure 1-2, when there are three linear Hall elements 3, one of the linear Hall elements 3 is located in the middle of the adsorption surface of the electromagnet 1, and the three linear Hall elements 3 are equidistant and symmetrical distribution, the most preferred one-line arrangement can be adopted, which can effectively reduce the influence of the permanent magnet 2 swing and side deviation on the distance signal during the measurement process, and improve the accuracy of distance detection. When the linear Hall element 3 is set to three, it can Applied to E-type electromagnets.

Further, the number of the linear Hall elements 3 is five, and one of the linear Hall elements 3 is located in the middle of the adsorption surface and is opposite to the permanent magnet 2, and the other four linear Hall elements 3 are in the form of Equidistant rotational symmetry is arranged on the periphery of the adsorption surface.

Specifically, as shown in Figure 3-4, when there are five linear Hall elements 3, one of the linear Hall elements 3 is located in the middle of the adsorption surface of the electromagnet 1, and the remaining four linear Hall elements 3 are equidistant The rotation symmetry of the electromagnet 1 is distributed on the adsorption surface of the electromagnet 1, located on the periphery of the adsorption surface, and the distance between the four linear Hall elements 3 and the linear Hall element 3 located in the middle of the adsorption surface of the electromagnet 1 is equal, Adopting this setting method can effectively reduce the influence of swinging and lateral deviation of the permanent magnet 2 on the distance signal during the measurement process, and improve the accuracy of distance detection. When the number of linear Hall elements 3 is set to five, it can be applied to the electromagnetic chuck.

Further, the signal compensation module 4 is a digital controller, and the digital controller uses the following formula to calculate the compensated magnetic field strength electrical signal:

Wherein, _after U is compensated, it is the magnetic field strength electric signal after compensation; U ₀ is the magnetic field strength electric signal of the mixed magnetic field obtained by the linear Hall element located in the middle position of the adsorption surface; K is the compensation coefficient, and U _zeroing is the zeroing coefficient; i is the i-th linear Hall element located at the periphery of the adsorption surface, and i≥1; n is the number of linear Hall elements located at the periphery of the adsorption surface; U _i is the mixture obtained by the linear Hall elements located at the periphery of the adsorption surface magnetic field strength electric signal

对输入的混合磁场的磁场强度电信号进行补偿、以抵消来自电磁磁场的影响、并输出仅与永磁磁场相关的补偿后的磁场强度电信号，用以表征所述电磁铁1与所述永磁体2之间的距离。Specifically, when the signal compensation module 4 is a digital controller, the compensation formula

Compensating the electric field strength signal of the input mixed magnetic field to counteract the influence from the electromagnetic field, and outputting a compensated electric field strength electric signal related only to the permanent magnetic field to characterize the electromagnet 1 and the permanent magnetic field. Distance between magnets 2.

Further, the signal compensation module 4 is an analog circuit;

The analog circuit includes: an input signal processing module 41 and a parameter adjustment module 42 sequentially connected in series;

The input signal processing module 41 includes at least two first operational amplifiers 411, the output end of each first operational amplifier 411 is connected to the input end of the parameter adjustment module 42 through a first resistor 412, each first operational amplifier 411 The non-inverting input end of the first operational amplifier 411 is connected to the output end of the corresponding linear Hall element 3, and the inverting input end of each first operational amplifier 411 is connected to the respective output end;

The parameter adjustment module 42 includes a second operational amplifier 421 and a third operational amplifier 422 connected in series. The resistor 423 is connected to the output end of the second operational amplifier 421, the same input end of the second operational amplifier 421 is connected to the adjustable potentiometer 424, and the output end of the second operational amplifier 421 is connected to the third operational amplifier The non-inverting input terminal of the third operational amplifier 422 is connected to the output terminal of the third operational amplifier 422, and the output terminal of the third operational amplifier 422 outputs a compensated magnetic field strength electric signal.

Specifically, Fig. 5 is a structural schematic diagram of the signal compensation module of the distance measuring device of the permanent magnet electromagnetic hybrid system provided by the utility model. As shown in Fig. 5, five linear Hall elements 3 are set in this embodiment, and the simulation The circuit includes an input signal processing module 41 and a parameter adjustment module 42 connected in series in sequence, the input signal processing module 41 includes five first operational amplifiers 411, and the output terminal of each first operational amplifier 411 is connected to the The input end of the parameter adjustment module 42, the same direction input end of each first operational amplifier 411 is connected to the output end of the corresponding linear Hall element 3, and the inverting input end of each first operational amplifier 411 is connected to the respective output end; The parameter adjustment module 42 includes a second operational amplifier 421 and a third operational amplifier 422 connected in series. The resistor 423 is connected to the output end of the second operational amplifier 421, the same input end of the second operational amplifier 421 is connected to the adjustable potentiometer 424, and the output end of the second operational amplifier 421 is connected to the third operational amplifier The non-inverting input terminal of the third operational amplifier 422 is connected to the output terminal of the third operational amplifier 422, and the output terminal of the third operational amplifier 422 outputs a compensated magnetic field strength electric signal. Wherein, the number of the first operational amplifier 411 and the first resistor 412 is the same as the number of the linear Hall element 3, and both the first resistor 412 and the second resistor 423 can be sliding rheostats, rheostat boxes, etc.; The first resistor 412 corresponding to the linear Hall element 3 in the middle of the adsorption surface adopts a sliding rheostat, and the first resistor 412 corresponding to the linear Hall element 3 located on the periphery of the adsorption surface can adopt a fixed resistance resistor; in addition, by adjusting the second resistor The resistance value of 423 can realize the adjustment of the sensitivity of the analog circuit to the permanent magnetic field; by adjusting the adjustable potentiometer 424, the zero adjustment of the analog circuit can be realized.

In this embodiment, the first resistance 412 corresponding to the linear Hall element 3 located in the middle of the adsorption surface is VR ₀ , and the first resistance 412 corresponding to the linear Hall element 3 located on the periphery is R ₁ , R ₂ , R _3. R ₄ . In practical application, the first resistors 412 of the peripheral linear Hall elements 3 are set to the same resistance value.

Specifically, signal compensation is performed through an analog circuit.

Take setting five linear Hall elements 3 as an example, and obtain five electrical signals of magnetic field strength respectively: U ₀ , U ₁ , U ₂ , U ₃ and U ₄ ; among them, U ₀ is a linear Hall element located in the middle of the adsorption surface 3. The electric signal of the magnetic field intensity of the mixed magnetic field obtained is greatly affected by the permanent magnetic field; U ₁ , U ₂ , U ₃ , and U ₄ are the remaining four linear Hall elements arranged on the periphery of the adsorption surface 3 The obtained electric signal of the magnetic field intensity of the mixed magnetic field shows that the four linear Hall elements 3 are geometrically equidistant and rotationally symmetrical, and are less affected by the permanent magnetic field.

The purpose of this analog circuit is to use a plurality of linear Hall elements 3 to obtain a linear relationship between the magnetic field strength electrical signals of the electromagnetic field, thereby canceling the influence from the electromagnetic field and outputting a compensated magnetic field that is only related to the permanent magnetic field strength electrical signal. Set the linear Hall element 3 on the adsorption surface of the electromagnet 1 in the same direction (for example, the working surface of the linear Hall element 3 faces the electromagnet 1), then the influence of the electromagnetic field on U ₀ is the same as that on U ₁ , U ₂ , The effects of U ₃ and U ₄ are opposite, for example, while U ₀ increases, U ₁ , U ₂ , U ₃ , and U ₄ decrease.

From the circuit analysis about the second operational amplifier 421, the following relationship can be obtained:

Wherein, R ₁ =R ₂ =R ₃ =R ₄ . Further simplification can be obtained,

为U₀与

之间的敏感度，可看作模拟电路的补偿系数；U_调零是调零系数，由可调电位计产生。Wherein, U _{after compensation} is the compensated magnetic field strength electrical signal output by the third operational amplifier;

for U ₀ with

The sensitivity between them can be regarded as the compensation coefficient of the analog circuit; U _zeroing is the zeroing coefficient, which is generated by the adjustable potentiometer.

It can be seen from the above formula that fine-tuning VR ₀ can offset the influence of the electromagnetic field on U _{after compensation} ; fine-tuning VR _secondly can adjust the sensitivity of the analog circuit to the permanent magnetic field; fine-tuning U _zero can zero-adjust the output signal of the analog circuit .

Example 1

As shown in Figure 1-2, in this embodiment, the electromagnet 1 adopts 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-type electromagnet, and the three linear Hall elements Hall elements 3 are arranged on the adsorption surface at equal intervals in a straight line, and the linear Hall element 3 in the middle position is located in the middle of the adsorption surface and is opposite to the permanent magnet 2; the signal compensation module 4 is set on the adsorption surface. The signal detection in this way can effectively reduce the influence of the permanent magnet 2 swinging and lateral deviation on the distance signal during the measurement process, and improve the accuracy of the distance detection.

Example 2

As shown in Figure 3-4, in this embodiment, the electromagnet 1 adopts 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, and one of the linear Hall elements 3 Located in the center of the adsorption surface of the electromagnet 1, the remaining four linear Hall elements 3 are equidistant and rotationally symmetrically distributed on the adsorption surface of the electromagnet 1, located on the periphery of the adsorption surface, and the four linear Hall elements 3 is equal to the distance from the linear Hall element 3 located in the middle of the adsorption surface of the electromagnet 1; the signal compensation module 4 is arranged on the adsorption surface. The signal detection in this way can effectively reduce the influence of the permanent magnet 2 swinging and lateral deviation on the distance signal during the measurement process, and improve the accuracy of the distance detection.

Example 3

Fig. 6 is the change relation schematic diagram of the magnetic field intensity electric signal after the compensation provided by the utility model and the distance between the electromagnet and the permanent magnet; As shown in Fig. 6, the signal compensation module 4 described in the present embodiment is an analog circuit, so The distance measuring device includes five linear Hall elements 3, and one of the linear Hall elements 3 is located in the middle of the adsorption surface and is opposite to the permanent magnet 2, and the remaining four linear Hall elements 3 are equidistant The rotational symmetry of is arranged on the periphery of the adsorption surface. The resistance value of the first resistor 412 corresponding to the peripheral linear Hall element 3 is 90 kΩ, and the resistance value of the first resistor 412 corresponding to the linear Hall element 3 located in the middle of the adsorption surface is 169.2 kΩ. The analog circuit is used to compensate the magnetic field strength electric signal of the mixed magnetic field obtained by the linear Hall element 3 to cancel the influence from the electromagnetic field, and output the compensated magnetic field strength electric signal related only to the permanent magnetic field. Further, the signal compensation module 4 can determine the actual distance between the permanent magnet 2 and the electromagnet 1 according to the functional relationship between the distance and the compensated magnetic field strength electric signal, as shown in Figure 6, in three different excitation Under the situation of electric current (0mA, 100mA,-100mA), the electric signal of the magnetic field strength after the compensation of signal compensating module 4 outputs is almost consistent, shows that the electric signal of magnetic field strength after compensation is no longer subject to the influence of electromagnetic field, only with permanent magnetic field relevant.

The optional implementation of the embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings. However, the embodiment of the utility model is not limited to the specific details in the above-mentioned implementation. Various simple modifications are made to the technical solution of the embodiment of the utility model, and these simple modifications all belong to the protection scope of the embodiment of the utility model.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, the embodiments of the present utility model will not further describe various possible combinations.

Those skilled in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing the relevant hardware through a program. (processor) executes all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

In addition, any combination of various implementations of the embodiments of the present invention can also be made, as long as they do not violate the idea of the embodiments of the present invention, they should also be regarded as the content disclosed by 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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