CN114814270B - Variable magnetic flux rotating speed sensor - Google Patents
Variable magnetic flux rotating speed sensor Download PDFInfo
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- CN114814270B CN114814270B CN202210390175.2A CN202210390175A CN114814270B CN 114814270 B CN114814270 B CN 114814270B CN 202210390175 A CN202210390175 A CN 202210390175A CN 114814270 B CN114814270 B CN 114814270B
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- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 48
- 230000000452 restraining effect Effects 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
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- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
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- 230000008859 change Effects 0.000 abstract description 46
- 230000006698 induction Effects 0.000 abstract description 22
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- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
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- 230000001629 suppression Effects 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage
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Abstract
The invention discloses a variable magnetic flux rotating speed sensor, which comprises a trigger wheel, an electromagnetic induction restraining member, a measuring coil and a permanent magnet, wherein the trigger wheel is used for being connected to a measured rotating object to rotate together with the measured rotating object, the permanent magnet is positioned on the radial direction of the trigger wheel, the electromagnetic induction restraining member and the measuring coil are arranged between the permanent magnet and the trigger wheel, and the electromagnetic induction restraining member generates induction current under the rotating action of the trigger wheel so as to form a magnetic field for obstructing the magnetic flux change in the measuring coil. The variable magnetic flux rotating speed sensor disclosed by the invention utilizes the magnetic field induced by the electromagnetic induction inhibition component to block the magnetic flux change in the measuring coil, reduces the induced electromotive force generated in the measuring coil, reduces the lower the rotating speed, reduces the lower the induced electromotive force, increases the higher the rotating speed, reduces the induced electromotive force, realizes the nonlinear reduction of output voltage, reduces the U real max/Ureal min ratio, effectively realizes the widening of the rotating speed acquisition range and meets the development requirement.
Description
Technical Field
The invention relates to the technical field of rotating speed sensors, in particular to a variable magnetic flux rotating speed sensor.
Background
The traditional variable magnetic flux rotating speed sensor comprises a trigger wheel, a measuring coil and a permanent magnet, wherein the measuring coil and the permanent magnet are arranged in a static manner, the trigger wheel is arranged on a measured rotating object to rotate along with the measured rotating object, when the trigger wheel rotates, the air gap magnetic resistance is changed, the permanent magnet is static, the magnetic flux passing through the measuring coil is changed, so that induced electromotive force is generated on the measuring coil, an alternating current signal is generated in the measuring coil, and the rotating speed of the trigger wheel can be obtained by detecting the alternating current signal in the measuring coil.
The induced electromotive force of the variable magnetic flux rotation speed sensor is related to the magnetic flux change rate, the simplified formula is E= -N' dphi/dt, wherein N is the number of turns of the measuring coil, and can be regarded as a constant, the change amount of dphi magnetic flux is determined by the product structure, and is usually a certain value at a certain geometric position of a certain measuring system, so that the magnetic flux change rate dphi/dt increases along with the increase of the rotation speed of the trigger wheel, and the induced electromotive force E increases along with the increase of the rotation speed of the trigger wheel. The frequency of the induced electromotive force is proportional to the passing frequency of the trigger wheel, namely proportional to the rotation speed of the trigger wheel, the relation is f=nz/60, n is the rotation speed of the trigger wheel, z is the number of teeth of the trigger wheel, and f is the frequency of the induced electromotive force.
Due to the limitations of the collector manufacturing technology, a clear interface definition is required for the signal voltage, and the voltage is determined to be between the minimum detectable signal voltage U min and the maximum detectable voltage U max, so that the collector cannot be collected when the voltage is too small, and the collector cannot be collected or is damaged when the voltage is too large. As shown in fig. 1, the contradiction exists between the demand characteristic curve and the actual output characteristic curve, the abscissa n in the diagram represents the rotation speed, the ordinate Vp-p is the voltage peak value occurring in each magnetic flux change period, the output voltage U real max of the actual characteristic curve at n max is higher than U max, the demand of the measurement range cannot be met, the ratio of U real max/Ureal min in the diagram is greater than U max/Umin, if the method of linearly reducing the output voltage is adopted, although the U real max at high rotation speed can be reduced to the measurable range, the U real min at low rotation speed is too small to exceed the measurable range, the actual application of the product cannot be realized, the rotation speed acquisition range cannot be widened, and the development of the aeroengine electric control system cannot be met.
Disclosure of Invention
The invention aims to solve the technical problems and the technical task of the invention, and aims to improve the prior art, provide a variable magnetic flux rotating speed sensor, and solve the problems that the output voltage peak value of the variable magnetic flux rotating speed sensor in the prior art is too high at high rotating speed, the output voltage peak value at low rotating speed is too low by adopting a mode of linearly reducing the output voltage, and the rotating speed acquisition range is difficult to be effectively widened.
In order to solve the technical problems, the technical scheme of the invention is as follows:
The utility model provides a become magnetic flux rotational speed sensor, includes trigger wheel, electromagnetic induction restraining component, measuring coil and permanent magnet, the trigger wheel is used for connecting and rotates along with it on the measured rotation object, the permanent magnet is located the radial of trigger wheel, electromagnetic induction restraining component and measuring coil set up between permanent magnet and trigger wheel, electromagnetic induction restraining component produces the induced current under the trigger wheel rotation effect in order to form the magnetic field that obstructs the magnetic flux change in the measuring coil. The variable magnetic flux rotating speed sensor is additionally provided with the electromagnetic induction restraining component, when the trigger wheel acts, the air gap magnetic resistance is changed to generate a changed magnetic field, electromotive force is induced in the measuring coil due to the change of magnetic flux, the electromagnetic induction restraining component generates induced current in the changed magnetic field, the magnetic field generated by the induced current always blocks the change of the original magnetic field, so that the change of the magnetic flux in the measuring coil is blocked, the induced electromotive force generated in the measuring coil is reduced, the lower the rotating speed is, the lower the induced electromotive force is, the higher the rotating speed is, the higher the induced electromotive force is, the nonlinear output voltage reduction is realized, the reduction of the U real max/Ureal min ratio is realized, the output voltage at the low rotating speed can be ensured to be collected, the output voltage at the high rotating speed is effectively reduced, the maximum rotating speed which can be detected is increased, the rotating speed collection range is effectively widened, and the development requirement is met.
Further, the electromagnetic induction suppression members are respectively arranged at one or more positions of the axial end side of the measuring coil, the circumferential periphery of the measuring coil and the inside of the measuring coil, when the trigger wheel rotates, the air gap magnetic resistance is changed to generate a changed magnetic field, the magnetic flux passing through the measuring coil is periodically changed, induced electromotive force is generated on the measuring coil, alternating current is generated in the measuring coil, the electromagnetic induction suppression members at each position are influenced by the changed magnetic field to generate induced current, the magnetic field generated by the induced current always blocks the change of the original magnetic field, the magnetic flux in the measuring coil is blocked, the induced electromotive force generated in the measuring coil is reduced, and finally the output voltage of the measuring coil is reduced.
Further, the magnetic pole direction of the permanent magnet is along the radial direction of the trigger wheel, two electromagnetic induction restraining members are arranged at intervals along the radial direction of the trigger wheel, the measuring coil is positioned between the two electromagnetic induction restraining members, the electromagnetic induction restraining members can effectively generate induction current in a changing magnetic field generated under the rotation action of the trigger wheel, effectively restrain the change of the magnetic field, prevent the change of magnetic flux in the measuring coil, and effectively reduce the induction electromotive force generated on the measuring coil.
Further, the electromagnetic induction suppressing member includes one or a combination of a short-circuit coil and an eddy current generating member that inductively generates an electric eddy current. The short-circuit coil is a circuit loop which is artificially arranged, induction current is generated due to electromagnetic induction when the short-circuit coil is in a changed magnetic field, and then an induction magnetic field is generated, the induction magnetic field always blocks the change of a primary magnetic field, so that the change of magnetic flux in the measuring coil is blocked, the change rate of the magnetic flux in the measuring coil is reduced, further, the induced electromotive force generated on the measuring coil is reduced, the output voltage of the measuring coil is effectively reduced, the eddy current generating component is actually a conductor, and is not an artificially arranged circuit loop, but can be equivalently regarded as a closed circuit in the direction perpendicular to the magnetic field, the magnetic flux in the closed circuit is continuously changed due to the changed magnetic field, thus vortex-shaped induction current is generated in the conductor, the vortex-shaped induction current is electric eddy current, the electric eddy current is the induction current in a special form, the electric eddy current generates the induction magnetic field, the induction magnetic field always blocks the change of the primary magnetic field, so that the change of the magnetic flux in the measuring coil is blocked, the change of the magnetic flux in the measuring coil is reduced, the magnetic flux change rate on the measuring coil is further, the induced electromotive force generated on the measuring coil is reduced, and the output voltage of the measuring coil is effectively reduced.
Further, the short-circuit coil comprises one of a coil with an initial end electrically connected with the tail end and a coil with a load connected between the initial end and the tail end, the structure is simple, implementation is easy, the coil with the initial end electrically connected with the tail end can generate larger induction current, so that magnetic flux change in the measuring coil is effectively hindered, the load such as a resistor is connected between the initial end and the tail end of the coil to control the whole resistance in a circuit loop, the magnitude of the induction current is controlled, the strength of the generated induction magnetic field is controlled, the magnetic flux change in the measuring coil is controlled, and the range of the output voltage of the measuring coil can be adjusted by adjusting the resistance of the load.
Further, the axial direction of the short-circuit coil is perpendicular to the axial direction of the measuring coil or parallel to the axial direction of the measuring coil. Whichever kind of structure, the short-circuit coil can all produce induced current and then produce induced magnetic field under the effect of the magnetic field that changes that produces when the trigger wheel rotates, and induced magnetic field can all hinder the change of primary magnetic field to hinder the magnetic flux in the measuring coil and change, and then reduce the induced electromotive force that produces on the measuring coil, effectively reduce measuring coil's output voltage.
Furthermore, the vortex generating component is in one of a flat plate piece, a circular ring piece and a polygonal special-shaped piece at the periphery of a middle circular hole, and is simple in structure, easy to implement and convenient to assemble.
Further, still include soft magnetic core, soft magnetic core penetrates inside measuring coil, utilizes soft magnetic core to carry out magnetic conduction for produce bigger magnetic induction intensity in the measuring coil in order to reduce the whole volume of variable magnetic flux rotational speed sensor.
Further, the resistivity of the electromagnetic induction inhibition component is smaller than 4.5x -8 Ω'm, and the larger the power consumption per unit mass generated by the material with smaller resistivity is, the larger the eddy current can be generated, so that the output voltage at the time of high rotating speed is effectively reduced, the detectable maximum rotating speed is increased, and the widening of the rotating speed acquisition range is effectively realized.
Further, the electromagnetic induction suppressing member includes one or a combination of copper, aluminum, silver, and gold.
Compared with the prior art, the invention has the advantages that:
The variable magnetic flux rotating speed sensor disclosed by the invention utilizes the magnetic field induced by the electromagnetic induction inhibition component to block the magnetic flux change in the measuring coil, reduces the induced electromotive force generated in the measuring coil, reduces the lower the rotating speed, reduces the lower the induced electromotive force, increases the higher the rotating speed, reduces the induced electromotive force, realizes the nonlinear reduction of output voltage, reduces the U real max/Ureal min ratio, effectively realizes the widening of the rotating speed acquisition range and meets the development requirement.
Drawings
FIG. 1 is a diagram showing the relationship between the rotational speed and the output voltage of a variable magnetic flux sensor;
FIG. 2 is a schematic diagram of a variable flux speed sensor according to the present invention;
FIG. 3 is a schematic diagram of output voltages of a variable magnetic flux speed sensor of conventional construction at low speeds;
FIG. 4 is a schematic diagram of output voltages of the variable magnetic flux speed sensor of the present invention at low speeds;
FIG. 5 is a schematic diagram of output voltages of a variable flux speed sensor of conventional construction at high speeds;
FIG. 6 is a schematic diagram of output voltages of the variable flux speed sensor of the present invention at high speeds;
fig. 7 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a third embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a fourth embodiment of the present invention;
fig. 10 is a schematic structural view of the electromagnetic induction suppressing member;
Fig. 11 is another structural schematic diagram of the electromagnetic induction suppressing member;
fig. 12 is another structural schematic diagram of the electromagnetic induction suppressing member;
fig. 13 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a fifth embodiment of the present invention;
fig. 14 is a schematic structural view of a shorting coil;
FIG. 15 is a schematic diagram of another configuration of a shorting coil;
Fig. 16 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a sixth embodiment of the present invention.
In the figure:
trigger wheel 1, eddy current generating member 21, shorting coil 22, measuring coil 3, permanent magnet 4, soft magnetic core 5, and extension 51.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the variable magnetic flux rotating speed sensor disclosed by the embodiment of the invention, the electromagnetic induction inhibition component is added, the induction current is generated in the electromagnetic induction inhibition component due to the alternating magnetic field, and the magnetic field generated by the induction current blocks the magnetic flux change in the measuring coil, so that the induction electromotive force generated in the measuring coil is reduced, the higher the change frequency of the alternating magnetic field is, the larger the electric vortex is, the output voltage is reduced in a nonlinear manner, the U real max/Ureal min is effectively reduced, the rotating speed acquisition range is further effectively widened, and the development requirement is met.
Example 1
As shown in fig. 2, the variable magnetic flux rotation speed sensor mainly comprises a trigger wheel 1, an electromagnetic induction restraining member, a measuring coil 3 and a permanent magnet 4, wherein the trigger wheel 1 is used for being connected to a measured rotating object to rotate together therewith, the trigger wheel 1 is provided with a plurality of protruding structures at intervals in the axial direction of the trigger wheel 1, so that the trigger wheel 1 is in a gear structure as a whole, the permanent magnet 4 is positioned in the radial direction of the trigger wheel 1, the electromagnetic induction restraining member and the measuring coil 3 are arranged between the permanent magnet 4 and the trigger wheel 1, the electromagnetic induction restraining member is a conductor, the electromagnetic induction restraining member, the measuring coil 3 and the permanent magnet 4 are connected together as a whole module, the whole module is fixed at a specific position on the radial outer side of the trigger wheel 1, an air gap with a certain interval is kept between the whole module and the trigger wheel 1, the trigger wheel 1 is made of magnetic conductive material (such as iron material or iron alloy material), the trigger wheel 1 rotates along with the measured rotating object, the air gap magnetic resistance is periodically changed to generate a changed magnetic field, the magnetic flux of the measuring coil 3 is changed, induced electromotive force is generated on the measuring coil 3 through electromagnetic induction, the rotating speed of the trigger wheel 1 can be known through detecting the output voltage of the measuring coil 3, the electromagnetic induction restraining component generates induction current under the rotating action of the trigger wheel 1 to form a magnetic field which prevents the magnetic flux in the measuring coil 3 from changing, specifically, the air gap magnetic resistance is changed to generate a changed magnetic field when the trigger wheel 1 rotates, the electromagnetic induction restraining component generates induction current under the action of the changed magnetic field to generate an induced magnetic field, the induced magnetic field always prevents the change of the original magnetic field, and therefore the change of the magnetic flux in the measuring coil 3 is prevented, and then reduce and produce the induced electromotive force on the measuring coil 3, namely reduce the output voltage of measuring coil 3, namely can make U real max that the high rotational speed corresponds effectively reduce for U real max when the high rotational speed reduces to measurable range, and then can detect the collection to the voltage that the higher rotational speed produced, effectively widen the rotational speed and gather the scope.
In this embodiment, the electromagnetic induction suppressing means specifically adopts the eddy current generating means 21 for generating the eddy current by induction, and the basic principle of generating the eddy current by the eddy current generating means 21 is that when the conductor is in the alternating magnetic field, the conductor can be equivalently a closed circuit, and the alternating magnetic field changes the magnetic flux passing through the closed circuit, so that the induced electromotive force is generated on the closed circuit, and further, the eddy current is generated, and the phenomenon that the induced current is generated by the electromagnetic induction in the conductor is the eddy current phenomenon.
In the variable magnetic flux rotation speed sensor of the embodiment, the eddy current generating member 21 is in an alternating magnetic field, so that an electric eddy current is generated, and the magnetic field generated by the electric eddy current is used for reducing the change of the total magnetic field, so that the electromotive force induced by the measuring coil 3 is reduced, namely the output voltage is reduced, and the voltage generated by higher rotation speed can be collected, so that the rotation speed collection range is effectively widened.
The power consumption per unit mass generated by the eddy current on the conductor is as follows:
Wherein P is the power consumption W/kg per unit mass;
k is a constant;
b p is the magnetic field peak T;
d is the conductor thickness m;
f is the frequency of the magnetic field change Hz;
ρ is the conductor resistivity Ω m;
d is the density of the conductor material kg/m 3.
From the above formula, it is known that other parameters except f are determined after the product is designed, and the variable magnetic flux rotating speed sensor of the finished product can be regarded as a constant, the power consumption of the electric vortex is proportional to the square of the frequency f, in other words, the power consumption increasing amplitude of the electric vortex is obviously increased along with the increase of the frequency f, but the nonlinear growth relation is that the higher the rotating speed of the trigger wheel 1 is corresponding to the variable magnetic flux rotating speed sensor in fig. 2, the stronger the electric vortex is, and the higher the rotating speed of the trigger wheel 1 is, the larger the electric vortex is increased. The magnetic field generated by the electric vortex always blocks the change of the original magnetic field, so that the total magnetic field change is reduced after the magnetic field generated by the electric vortex is overlapped with the original magnetic field, namely the alternating magnetic field change sensed by the measuring coil 3 in the variable magnetic flux rotating speed sensor is reduced, the reduction trend is that the reduction amplitude is smaller at a low rotating speed, and the reduction amplitude is larger at a high rotating speed, thereby realizing the nonlinear reduction of the output voltage and achieving the purpose of reducing U real max/Ureal min; and as can be seen from the above formula, the smaller the specific resistance ρ of the conductor, the larger the power consumption per unit mass is, and the larger the eddy current is, and the output voltage at the time of high rotation speed can be reduced more greatly, so that the electromagnetic induction suppressing member is preferably made of a high conductivity material with small specific resistance, the specific resistance of the electromagnetic induction suppressing member is less than 4.5x -8 Ω "m, and the optional material includes one or a combination of copper, aluminum, silver and gold.
As shown in fig. 2, the magnetic pole direction of the permanent magnet 4 is along the radial direction of the trigger wheel 1, the axial direction of the measurement coil 3 is also along the radial direction of the trigger wheel 1, and the device further comprises a soft magnetic core 5, wherein the soft magnetic core 5 penetrates into the measurement coil 3, and is used for conducting magnetic, so that larger magnetic induction intensity is generated in the small-sized measurement coil, the whole volume of the variable magnetic flux rotating speed sensor is beneficial to shrinking, the eddy current generating member 21 is arranged at the axial end side of the measurement coil 3, which is close to the trigger wheel 1, the eddy current generating member 21 is a flat plate piece, particularly a circular plate shape, shown in fig. 10, the plane direction of the eddy current generating member 21 is perpendicular to the axial direction of the measurement coil 3, a certain air gap is kept between the eddy current generating member 21 and the trigger wheel 1, when the trigger wheel 1 rotates, the air gap magnetic resistance changes to generate a changing magnetic field, the magnetic flux passing through the measurement coil 3 changes, thereby generating an induced electromotive force on the measurement coil 3, the eddy current in the eddy current generating magnetic field acts on the original magnetic field, the change in the measurement coil 3, the change in the axial direction of the eddy current generating member, the eddy current generating member is blocked in the changing the magnetic field, the change in the measuring coil 3, the induced electromotive force is generated in the measured magnetic flux, the change is reduced, the magnetic flux is generated in the measured magnetic flux, the measured magnetic flux is greatly, and the change in the measured magnetic flux, the rotating speed is reduced, the measured magnetic flux is generated, and the measured by the measured magnetic flux, the rotating speed is more rapidly, and the measured, the magnetic flux is reduced, the rotating speed is generated, and the speed is lower is generated.
The variable magnetic flux rotation speed sensor according to the present embodiment is compared with a variable magnetic flux rotation speed sensor of a conventional structure by performing output voltage simulation, that is, the electromagnetic induction suppression member is removed compared with the variable magnetic flux rotation speed sensor according to the present embodiment, and the shape, structure, size, and the like of the remaining components are the same as those of the variable magnetic flux rotation speed sensor according to the present embodiment. As shown in fig. 3 to 6, the simulation comparison result shows that when the trigger wheel 1 rotates at a low speed, the simulation output voltage peak value of the variable magnetic flux rotating speed sensor with the traditional structure is 13.1V, the simulation output voltage peak value of the variable magnetic flux rotating speed sensor is 12.2V, the output voltage reduction amplitude of the vortex generating component at the low rotating speed is smaller, and only 6.9% is reduced; when the trigger wheel 1 rotates at a high speed, the peak value of the analog output voltage of the variable magnetic flux rotating speed sensor with a traditional structure is 101.5V, the peak value of the analog output voltage of the variable magnetic flux rotating speed sensor is 55.9V, the output voltage is reduced by 45%, the reduction amplitude of the output voltage of the vortex generating component at a high rotating speed is larger, and the nonlinear reduction of the output voltage is realized. The simulation result high-low voltage ratio of the variable magnetic flux rotating speed sensor with the traditional structure is 7.75, the simulation result high-low voltage ratio of the variable magnetic flux rotating speed sensor is 4.58, the U real max/Ureal min ratio is effectively reduced by the existence of the vortex generating component, the output voltage at high rotating speed is greatly reduced, the rotating speed measuring range is effectively widened, the debugging process is simplified, and the total cost of materials is reduced.
Example two
As shown in fig. 7, the difference from the first embodiment is that the number of the vortex generating members 21 is plural, specifically, the vortex generating members 21 are respectively disposed at two axial ends of the measuring coil 3, or two vortex generating members 21 are disposed at intervals along the radial direction of the trigger wheel 1, the measuring coil 3 is disposed between the two vortex generating members 21, and the vortex generating members 21 at two axial ends of the measuring coil 3 are in the shape of a circular plate as shown in fig. 10, which has a simple structure and is easy to process and implement; and an eddy current generating member 21 is further arranged inside the measuring coil 3, the eddy current generating member 21 is in a circular ring shape as shown in fig. 11, and the eddy current generating member 21 is sleeved on the periphery of the soft magnetic core 5; and an eddy current generating member 21 is further arranged on the peripheral periphery of the measuring coil 3, the eddy current generating member 21 is in a circular ring shape as shown in fig. 11 and is sleeved on the peripheral periphery of the measuring coil 3 in a ring shape, or the eddy current generating member 21 can be a special-shaped member with a polygonal peripheral periphery of a middle circular hole as shown in fig. 12. The above-mentioned composite structure is adopted in this embodiment, the eddy current generating members 21 at each position can generate eddy currents under the action of the changing magnetic field, so that the change of the original magnetic field is reduced by using the magnetic field generated by the eddy current, the magnetic fields generated by the eddy current generating members 21 at different positions can block the change of magnetic flux in the measuring coil 3, the output voltage at high rotation speed is effectively reduced, and the U real max/Ureal min is effectively reduced, so that the rotation speed detection range is widened.
Example III
As shown in fig. 8, the difference from the first embodiment is that the soft magnetic core 5 is of an assembly structure which is in an "i" shape, the axial direction of the measuring coil 3 is perpendicular to the magnetic pole direction of the permanent magnet 4, whereas the soft magnetic core 5 in the first embodiment is of a "one" shape, and the axial direction of the measuring coil 3 is along the magnetic pole direction of the permanent magnet 4. In this embodiment, the plurality of vortex generating members 21 are provided, specifically, two vortex generating members 21 are provided at intervals along the radial direction of the trigger wheel 1, the measuring coil 3 is located between the two vortex generating members 21, the two vortex generating members 21 are in the shape of circular plate as shown in fig. 10, the axial direction of the measuring coil 3 located between the two vortex generating members 21 is perpendicular to the radial direction of the trigger wheel 1, so that the axial direction of the magnetic field generated by the induced current in the measuring coil 3 is perpendicular to the radial direction of the trigger wheel 1 and also perpendicular to the magnetic pole direction of the permanent magnet 4; in addition, an eddy current generating member 21 is further disposed inside the measuring coil 3, the eddy current generating member 21 is specifically a circular ring as shown in fig. 11, the eddy current generating member 21 is sleeved on the periphery of the soft magnetic core 5, and an eddy current generating member 21 is further disposed on the circumferential periphery of the measuring coil 3, the eddy current generating member 21 is a circular ring as shown in fig. 11 and sleeved on the circumferential periphery of the measuring coil 3, or the eddy current generating member 21 may be a shaped member with a polygonal shape as shown in fig. 12 and having a circular hole in the middle. The change of the original magnetic field is reduced by the magnetic field generated by the eddy current, the magnetic fields generated by the eddy current generating members 21 at different positions can block the magnetic flux change in the measuring coil 3, and the output voltage at high rotation speed can be greatly reduced, so that the rotation speed detection range is widened.
Example IV
As shown in fig. 9, the difference from the third embodiment is that the soft magnetic core 5 has an assembly structure in which two measuring coils 3 are wound on the "king" shaped soft magnetic core 5 at intervals. The axial direction of the two measuring coils 3 is perpendicular to the magnetic pole direction of the permanent magnet 4, and the two measuring coils 3 are symmetrically distributed on two sides of the central axis of the magnetic pole direction of the permanent magnet 4; an eddy current generating member 21 is also provided inside each measuring coil 3, which is fitted over the soft magnetic core 5, the eddy current generating member 21 being in the form of a circular ring as shown in fig. 11; and the peripheral of each measuring coil 3 is also sleeved with an eddy current generating member 21, and the eddy current generating member 21 is a circular ring-shaped piece as shown in fig. 11 or a polygonal special-shaped piece at the periphery of a middle round hole as shown in fig. 12.
Each measuring coil can respectively induce electromotive force, two groups of independent signal output can be realized, multiple groups of measuring can be carried out on the same trigger wheel, analysis and comparison can be carried out on multiple groups of measuring output signals, the measuring accuracy and reliability can be improved, when one group of measuring output fails, the measuring can be directly carried out continuously through the other group, the normal operation of equipment is not influenced, the variable magnetic flux rotating speed sensor is not required to be disassembled, and the use is more convenient.
Example five
As shown in fig. 13, the electromagnetic induction suppression component specifically adopts a short-circuit coil 22, the short-circuit coil 22 includes one of a coil with a start end electrically connected to a tail end and a coil with a load connected between the start end and the tail end, the coil with a load connected between the start end and the tail end is as shown in fig. 14, the short-circuit coil is a circuit loop artificially set, when the short-circuit coil is in a changing magnetic field, an induced current is generated due to electromagnetic induction, and then an induced magnetic field is generated, the induced magnetic field always blocks the change of an original magnetic field, the magnetic flux change in the measuring coil can be blocked, the magnetic flux change rate in the measuring coil is reduced, the induced electromotive force generated on the measuring coil is reduced, the output voltage of the measuring coil is effectively reduced, the number of turns of the short-circuit coil 22 can be specifically set as required, the strength of the induced magnetic field generated can be adjusted, and thus the reduction range of the output voltage of the measuring coil is adjusted, the range of the output voltage of the measuring coil is satisfied, the short-circuit coil 22 is wound by adopting a copper wire or the like, the resistance is relatively low, the current is directly connected with the tail end and the current of the measuring coil is controlled to be in a larger range, and the current is accurately controlled to be the load-connected to the measuring coil.
Similarly, the short-circuit coils 22 are respectively arranged at one or more positions of the axial end side of the measuring coil 3, the periphery of the measuring coil 3 and the inside of the measuring coil 3, in this embodiment, two short-circuit coils 22 are arranged at intervals along the radial direction of the trigger wheel 1, the measuring coil 3 is positioned between the two short-circuit coils 22, and the axial direction of the short-circuit coils 22 is parallel to the axial direction of the measuring coil 3, so that the structure is simple and the processing implementation is easy; a short-circuit coil 22 is also arranged in the measuring coil 3, and the short-circuit coil 22 is sleeved on the periphery of the soft magnetic core 5; and a short-circuit coil 22 is further arranged on the peripheral periphery of the measuring coil 3, and the short-circuit coil 22 is sleeved on the peripheral periphery of the measuring coil 3.
Example six
As shown in fig. 16, the short-circuit coil 22 and the eddy current generating member 21 may be mixed, that is, the short-circuit coil 22 or the eddy current generating member 21 may be employed respectively at any one of the positions around the measuring coil 3 and inside the measuring coil 3, and in this embodiment, the short-circuit coil 22 is provided at both axial ends of the measuring coil 3, the eddy current generating member 21 is also provided inside the measuring coil 3, and the eddy current generating member 21 is also provided around the circumference of the measuring coil 3.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The utility model provides a become magnetic flux rotational speed sensor, its characterized in that includes trigger wheel (1), electromagnetic induction restraining component, measuring coil (3) and permanent magnet (4), trigger wheel (1) are used for connecting and rotate along with it on the measured rotation object, permanent magnet (4) are located the radial of trigger wheel (1), electromagnetic induction restraining component and measuring coil (3) set up between permanent magnet (4) and trigger wheel (1), and electromagnetic induction restraining component, measuring coil (3) and permanent magnet (4) connect and constitute whole module, whole module sets up in the radial outside of trigger wheel (1), keeps the air gap between whole module and the trigger wheel (1), electromagnetic induction restraining component produces the induced current under trigger wheel (1) rotation effect in order to form the magnetic field that obstructs the magnetic flux variation in measuring coil (3).
2. The variable magnetic flux rotation speed sensor according to claim 1, wherein the electromagnetic induction suppressing member is provided at one or more positions of an axial end side of the measuring coil (3), a circumferential outer periphery of the measuring coil (3), and an inside of the measuring coil (3), respectively.
3. The variable magnetic flux rotation speed sensor according to claim 1, wherein the magnetic pole direction of the permanent magnet (4) is along the radial direction of the trigger wheel (1), the electromagnetic induction suppressing members are provided at two intervals along the radial direction of the trigger wheel (1), and the measuring coil (3) is located between the two electromagnetic induction suppressing members.
4. The variable magnetic flux rotation speed sensor according to claim 1, wherein the electromagnetic induction suppressing member includes one or a combination of a short-circuit coil (22) and an eddy current generating member (21) that induces an electric eddy current.
5. The variable magnetic flux rotation speed sensor according to claim 4, wherein the short-circuit coil (22) includes one of a coil having a start end electrically connected to a tail end and a coil having a load connected between the start end and the tail end.
6. A variable magnetic flux rotational speed sensor according to claim 5, characterized in that the axial direction of the short-circuit coil (22) is perpendicular to the axial direction of the measuring coil (3) or parallel to the axial direction of the measuring coil (3).
7. The variable magnetic flux rotation speed sensor according to claim 4, wherein the vortex generating member (21) has one of a flat plate member, a circular ring member, and a shaped member having a polygonal periphery of a central circular hole.
8. A variable magnetic flux rotational speed sensor according to any one of claims 1 to 7, further comprising a soft magnetic core (5), the soft magnetic core (5) penetrating inside the measuring coil (3).
9. The variable magnetic flux rotational speed sensor according to any one of claims 1 to 7, wherein the electromagnetic induction suppressing member has a resistivity of less than 4.5 x 10 -8 Ω -m.
10. The variable magnetic flux rotational speed sensor according to any one of claims 1 to 7, wherein the electromagnetic induction suppressing member includes one or a combination of copper, aluminum, silver, and gold.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115343501B (en) * | 2022-10-18 | 2023-03-24 | 四川新川航空仪器有限责任公司 | Variable magnetic flux type rotating speed sensor |
| CN115598370A (en) * | 2022-10-18 | 2023-01-13 | 四川新川航空仪器有限责任公司（Cn） | Variable magnetic flux type rotating speed sensor |
| CN115575673B (en) * | 2022-11-11 | 2023-03-14 | 四川新川航空仪器有限责任公司 | Vacuum high-rotation-speed test platform and test method for tone wheel |
| CN116592955B (en) * | 2023-07-17 | 2023-09-22 | 四川新川航空仪器有限责任公司 | Flow sensor |
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