CN114814272B - Magnetic rotation speed sensor - Google Patents
Magnetic rotation speed sensor Download PDFInfo
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- CN114814272B CN114814272B CN202210739767.0A CN202210739767A CN114814272B CN 114814272 B CN114814272 B CN 114814272B CN 202210739767 A CN202210739767 A CN 202210739767A CN 114814272 B CN114814272 B CN 114814272B
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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
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
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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
- G01P1/00—Details of instruments
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Abstract
The invention discloses a magnetic speed sensor, which comprises permanent magnets and coil assemblies, wherein the permanent magnets are arranged on a rotating piece to rotate along with the rotating piece, a plurality of permanent magnets are arranged at intervals along the rotating circumferential direction of the rotating piece, the coil assemblies are arranged on one side of the rotating piece in the radial direction, each coil assembly comprises a soft magnetic core and a measuring coil wound on the soft magnetic core, and one end or two ends of the measuring coil in the axial direction are respectively provided with a magnetic yoke piece for guiding a magnetic field into the soft magnetic core. The magnetic speed sensor utilizes the magnetic yoke piece to lead the magnetic field into the soft magnetic core in a constrained and concentrated manner, optimizes the magnetic field passing through the measuring coil, increases the change rate of the magnetic flux in the measuring coil, can increase the output voltage under the condition of not enhancing the magnetic field strength of the permanent magnet, and provides an optional optimization approach for improving the detection distance or reducing the magnetic field strength of the permanent magnet.
Description
Technical Field
The invention relates to the technical field of rotating speed sensors, in particular to a magnetic rotating speed sensor.
Background
The magnetic rotation speed sensor measures the rotation speed of an object by utilizing magnetoelectric induction, and belongs to a non-contact rotation speed measuring instrument. The magnetic rotating speed sensor has good anti-interference performance, is commonly used for rotating speed monitoring of equipment such as an engine and the like, and is widely applied to industrial production. The magnetic rotating speed sensor mainly comprises a soft magnetic core, a permanent magnet, a measuring coil and other components, when a measuring object rotates, magnetic flux of the measuring coil changes, so that induced electromotive force is generated on the measuring coil, an alternating voltage signal is generated in the measuring coil, the rotating speed of the measuring object can be obtained by detecting the alternating voltage signal in the measuring coil, the output voltage of the measuring coil is related to the rotating speed, the higher the rotating speed is, the higher the output voltage is, namely, the output voltage is in direct proportion to the rotating speed, and the output frequency is in direct proportion to the rotating speed.
However, the conventional magnetic rotation speed sensor has a limited measurement distance, and when the measurement coil is far away from a measurement object, a magnetic field acting in the measurement coil is weak, and the change rate of magnetic flux in the measurement coil is low, so that the output voltage is low, and the signal is difficult to reliably acquire. In order to meet the requirement of the amplitude of the output voltage, the conventional method is to increase the magnetic field strength of the permanent magnet, so as to increase the magnetic field acting in the measuring coil, and further increase the magnetic flux change rate in the measuring coil to increase the output voltage, but the excessively strong magnetic field of the permanent magnet can have adverse effects on other peripheral equipment, so that the excessively strong permanent magnet cannot be used in practice, and the actual requirement for reducing the magnetic performance of the permanent magnet is met.
Disclosure of Invention
The invention aims to solve the technical problems and the technical task of improving the prior art, provides a magnetic rotating speed sensor, and solves the problems that the measuring distance of the magnetic rotating speed sensor in the prior art is limited, the output voltage of a measuring coil is difficult to effectively increase in the traditional mode, signals are difficult to acquire, and adverse effects are generated on other peripheral equipment.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a magnetism speed sensor, includes permanent magnet and coil pack, the permanent magnet sets up and rotates together with thereupon on rotating the piece, the permanent magnet is provided with a plurality of along the rotation circumference interval of rotating the piece, coil pack sets up in the radial one side of rotating the piece, coil pack includes soft magnetic core and the measuring coil of coiling on soft magnetic core, is provided with the yoke piece that is used for leading into soft magnetic core with magnetic field respectively at measuring coil axial one end or both ends. The permanent magnet of the magnetic speed sensor rotates along with the rotating piece to generate a periodically changing magnetic field, the coil assembly is positioned in the periodically changing magnetic field, induced electromotive force is generated on the measuring coil by changing magnetic flux of the measuring coil, the magnetic yoke piece is made of soft magnetic materials, the magnetic yoke piece does not generate a magnetic field, the magnetic yoke piece forms a magnetic circuit to play a role in magnetic line transmission, the distribution of the magnetic field generated by the permanent magnet is changed by the magnetic yoke piece, the magnetic field generated by the permanent magnet is restrained and concentrated by the magnetic yoke piece and is transmitted into the soft magnetic core along the magnetic yoke piece, the magnetic field penetrating through the measuring coil is effectively enhanced, the magnetic flux change rate of the measuring coil is further increased, the output voltage is improved under the condition that the magnetic field intensity of the permanent magnet is not increased, adverse effects on other peripheral equipment are not generated, and the use reliability is high.
Further, the magnetic pole direction of the permanent magnet is along the radial direction of the rotating part, namely the N-level and S-level directions of the permanent magnet are along the radial direction of the rotating part, the coil assembly is positioned on the radial outer side of the rotating part, so that the magnetic pole of the permanent magnet is just opposite to the coil assembly when a certain permanent magnet rotates to be just opposite to the coil assembly, the magnetic field intensity applied to the coil assembly by the permanent magnet is maximum, when the permanent magnet rotates to be far away from the coil assembly, the magnetic field intensity applied to the coil assembly by the permanent magnet can be reduced, the magnetic field direction can also be changed, the magnetic field passing through the measuring coil is alternating, the magnetic flux change rate of the measuring coil is large enough, and the output voltage is improved.
Further, adjacent the magnetism opposite direction of permanent magnet, mean that the N level of preceding permanent magnet is towards the radial outside that rotates the piece promptly, and the S level of adjacent next permanent magnet is towards the radial outside that rotates the piece to when making the permanent magnet pass through coil pack in turn, make the magnetic field direction, the intensity of coil pack department take place the strong change, and then increase the magnetic flux rate of change through measuring the coil, more effective improvement measures the output voltage of coil, guarantee output voltage can satisfy the application demand.
Further, the cross-sectional dimension of the yoke member in the direction perpendicular to the axial direction of the measuring coil is larger than the cross-sectional dimension of the soft magnetic core in the direction perpendicular to the axial direction of the measuring coil. The magnetic field that disperses in the space originally is restricted by yoke spare and is concentrated in the yoke spare with in order to transfer into soft magnetic core along yoke spare, and the cross sectional dimension of yoke spare is greater than soft magnetic core's cross sectional dimension to can concentrate the more effective restriction of regional magnetic field on a large scale in soft magnetic core, effectively strengthen the magnetic field intensity who passes measuring coil, and then can increase the magnetic flux rate of change through measuring coil, realize improving measuring coil's output voltage.
Further, the magnetic yoke piece comprises one or a combination of a plate piece perpendicular to the axial direction of the measuring coil, a barrel piece along the axial direction of the measuring coil and a column piece along the axial direction of the measuring coil. Simple structure, easy to carry out, the effectual magnetic field restraint with the permanent magnet production concentrates on soft magnetic core in, improves output voltage under the condition of not increasing permanent magnet itself magnetic field intensity to different structures's yoke spare can produce different enhancement effects, satisfies different demands in a flexible way.
Furthermore, the yoke piece that is the plate extends along the radial one side of measuring the coil, increases the coverage area of yoke piece for magnetic field in the bigger region is restrained and is concentrated the introduction soft magnetic core, and more effective increase is through the magnetic flux rate of change of measuring the coil, improves output voltage.
Furthermore, the axial direction of the measuring coil is along the radial direction of the rotating part, which is beneficial to generating a magnetic field with strong change of the magnetic field direction and the magnetic field intensity in the measuring coil, so that the magnetic flux passing through the measuring coil has a large change rate, high induced electromotive force is generated on the measuring coil, and the output voltage is improved.
Further, the one end that the measuring coil is close to the rotation piece is provided with yoke spare, this yoke spare is perpendicular to and rotates the radial plate that links up with the contact of soft magnetic core tip, yoke spare simple structure, occupation space is little, can concentrate the effectual restraint of magnetic field in the large area scope and guide into soft magnetic core, thereby the reinforcing passes the magnetic field of measuring coil, and then the increase is through the magnetic flux rate of change of measuring coil, the yoke spare that is the plate simultaneously also can not too much increase coil pack to the interval between the rotation piece, can adjust the interval of coil pack to the rotation piece and come the nimble installation demand that adapts to various differences.
Furthermore, a magnetic yoke element is arranged at one end of the measuring coil far away from the rotating element, and the magnetic yoke element is one or a combination of a plate element perpendicular to the radial direction of the rotating element, a barrel element along the radial direction of the rotating element and a column element along the radial direction of the rotating element.
Further, the yoke spare that the one end that the rotation piece was kept away from to the measuring coil set up includes that the radial plate of perpendicular to rotation piece and the radial barrel part of rotation piece that radially set gradually along rotating the piece, the plate links up with soft magnetic core tip contact, the tip and the plate contact of barrel part link up. The measuring coil is kept away from the one end that rotates the piece and is had more sufficient space, is located the measuring coil and keeps away from the structure that the one end yoke piece that rotates the piece adopts plate and barrel combination, effectively increases the structure size for the magnetic field in bigger region can be abundant concentrate the conduction in the soft magnetic core, and then better improvement output voltage.
Compared with the prior art, the invention has the advantages that:
the magnetic speed sensor utilizes the magnetic yoke piece to lead the magnetic field into the soft magnetic core in a constrained and concentrated manner, optimizes the magnetic field passing through the measuring coil, increases the change rate of the magnetic flux in the measuring coil, can increase the output voltage under the condition of not enhancing the magnetic field strength of the permanent magnet, and provides an optional optimization approach for improving the detection distance or reducing the magnetic field strength of the permanent magnet.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic rotation speed sensor according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a magnetic rotation speed sensor according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another magnetic tachometer sensor in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a magnetic rotation speed sensor according to a third embodiment of the present invention;
FIG. 5 is a schematic structural view of a magnetic tachometer sensor without a yoke;
FIG. 6 is a graph of the output voltage signal of the magnetic tachometer sensor of FIG. 5;
FIG. 7 is a graph of an output voltage signal of the magnetic tachometer sensor of FIG. 1;
FIG. 8 is a graph of an output voltage signal of the magnetic tachometer sensor of FIG. 2;
FIG. 9 is a graph of the output voltage signal of the magnetic tachometer sensor of FIG. 3;
fig. 10 is a graph of an output voltage signal of the magnetic rotation speed sensor shown in fig. 4.
In the figure:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
According to the magnetic rotating speed sensor disclosed by the embodiment of the invention, the magnetic yoke piece is utilized to change the magnetic field distribution applied by the permanent magnet in the space, so that the magnetic field is more effectively guided into the soft magnetic core, the magnetic field acting in the measuring coil is increased, the magnetic flux change rate in the measuring coil is further improved to improve the output voltage, the measuring distance can be increased, the magnetic field strength of the permanent magnet is not required to be increased, and adverse effects on other peripheral equipment are avoided.
Example one
As shown in fig. 1, a magnetic rotation speed sensor mainly includes a permanent magnet 1 and a coil assembly, the permanent magnet 1 is disposed on a rotating member 4 to rotate together with the rotating member, the permanent magnet 1 is disposed at intervals along a rotation circumferential direction of the rotating member 4, the coil assembly is disposed at one side of the rotating member 4 in a radial direction, the coil assembly includes a soft magnetic core 2 and a measuring coil 3 wound around the soft magnetic core 2, a yoke member 5 for guiding a magnetic field into the soft magnetic core 2 is disposed at one end or both ends of the measuring coil 3 in an axial direction, the yoke member 5 is made of a soft magnetic material, the yoke member 5 itself does not generate a magnetic field, when the yoke member 5 is in the magnetic field, the yoke member 5 changes a distribution of the magnetic field, the yoke member 5 forms a magnetic path so that the magnetic field is conducted along the yoke member 5, the magnetic field originally dispersed in the space is constrained by the yoke member 5 after changing the direction, the yoke member 5 makes the magnetic lines of the magnetic field concentrated and more directional magnetic lines of the soft magnetic core 2, the yoke member 5 acts as a convergent function to guide the magnetic field into the soft magnetic core 2 more concentrated, optimize the magnetic field passing through the measuring coil 3, thereby increasing an effective magnetic field output distance of the magnetic field when the rotating magnet is increased, and the magnetic field intensity of the measuring coil 4 is increased, and the magnetic field is measured.
The magnetic pole direction of the permanent magnet 1 is along the radial direction of the rotating member 4, and the magnetic pole directions of the adjacent permanent magnets 1 are opposite, two or three of the permanent magnets 1 may be arranged on the rotating member 4, or four or more of the permanent magnets 1 may also be arranged on the rotating member 4, in this embodiment, the permanent magnets 1 are provided with four as an example, the permanent magnets 1 are uniformly distributed at intervals in the rotating circumferential direction of the rotating member 4, the magnetic pole direction of the permanent magnets 1 along the radial direction of the rotating member 4 means that the N pole and the S pole of the permanent magnet 1 face along the radial direction of the rotating member 4, specifically, as illustrated in fig. 1, the S pole of one permanent magnet 1 faces towards the radial inner side of the rotating member 4, and the N pole of the permanent magnet 1 faces towards the radial outer side of the rotating member 4, the S pole of the other permanent magnet 1 adjacent to the permanent magnet 1 faces towards the radial outer side of the rotating member 4, and the N pole faces towards the radial inner side of the rotating member 4, so that when the rotating member 4 rotates, the permanent magnets 1 with different magnetic pole directions alternately pass through the coil assembly, a magnetic field direction may generate a magnetic field with a strong change, thereby effectively increasing the magnetic flux change rate of the measuring coil, and realizing an effective output voltage without increasing the magnetic field intensity of the magnetic field of the permanent magnet itself.
In this embodiment, the axial direction of the measuring coil 3 is along the radial direction of the rotating member 4, so that when a certain permanent magnet 1 rotates to face the coil assembly, the magnetic pole of the permanent magnet 1 faces the coil assembly, that is, the magnetic pole direction of the permanent magnet 1 is along the axial direction of the measuring coil 3, at this time, the magnetic field intensity applied by the permanent magnet 1 at the measuring coil 3 is maximum, and when the rotating member 4 continues to rotate so that the latter permanent magnet 1 adjacent to the permanent magnet 1 faces the coil assembly, the magnetic pole of the latter permanent magnet 1 is still facing the coil assembly, at this time, the magnetic field intensity applied by the latter permanent magnet 1 at the measuring coil 3 is also maximum, but since the magnetic directions of the adjacent permanent magnets 1 are opposite, the direction of the magnetic field applied by the latter permanent magnet 1 at the measuring coil 3 is opposite to the direction of the magnetic field applied by the former permanent magnet 1 at the measuring coil 3, that is, a magnetic field with a strong change in the magnetic field direction and intensity change is generated at the measuring coil 3, when the axial direction of the measuring coil 3 along the radial direction of the rotating member 4, it is favorable for maximizing the change degree of the magnetic field passing through the measuring coil, that is increased, and further increasing the change rate of the magnetic flux output voltage of the measuring coil.
Furthermore, a yoke element 5 is arranged at one end of the measuring coil 3 close to the rotating element 4, the yoke element 5 is a plate perpendicular to the radial direction of the rotating element 4, that is, the plate is perpendicular to the axial direction of the measuring coil 3, the yoke element 5 has a simple structure, occupies a small space, is convenient to manufacture and has a low cost, in the absence of the yoke element 5, the magnetic field generated by the permanent magnet 1 is dispersed in the space, the size of the soft magnetic core 2 is limited, so that less magnetic force lines are conducted into the soft magnetic core 2, that is, the magnetic field strength of the measuring coil 3 is small, and further, the magnetic flux change rate through the measuring coil 3 is small, so that the signal acquisition is difficult, after the yoke element 5 is arranged, the yoke element 5 causes the distribution of the magnetic field generated by the permanent magnet to change, compared with the case without the yoke element 5, the magnetic force lines in a large area are bent and concentrated into the yoke element 5, the yoke element 5 concentrates the magnetic force lines originally dispersed in the space into a small area, thereby increasing the magnetic field strength of the soft magnetic field along the magnetic force lines of the magnetic field 2, and further, the magnetic field strength of the magnetic field is increased by the yoke element 3, and the yoke element 5, so that the magnetic field strength of the magnetic force lines is increased, and the magnetic field is increased in the magnetic field strength of the magnetic field is increased.
Measure coil 3 and be close to yoke piece 5 that rotates 4 one end setting and more be close to permanent magnet 1 for coil pack, because yoke piece 5 is the plate, yoke piece 5 can not occupy too big space in the footpath of rotating 4, also can not too much increase coil pack to the interval of rotating between, can be according to the nimble regulation coil pack of demand to the interval of rotating, can satisfy the narrow and small scene demand of installation space, also can satisfy the demand that improves detection distance.
The cross-sectional dimension of the magnetic yoke piece 5 in the axial direction perpendicular to the measuring coil 3 is larger than the cross-sectional dimension of the soft magnetic core 2 in the axial direction perpendicular to the measuring coil 3, the magnetic yoke piece 5 of the embodiment is a plate, that is, the surface area of the plate is larger than the cross-sectional area of the soft magnetic core 2, the magnetic yoke piece 5 can collect the magnetic field which is originally dispersed in the space in a large-range area and conduct the magnetic field into the soft magnetic core 2 in a concentrated manner, so that the magnetic field intensity in the soft magnetic core 2 is effectively improved, and the output voltage of the measuring coil 3 is improved.
Example two
On the basis of the first embodiment, a magnetic yoke member 5 is also arranged at one end of the measuring coil 3 away from the rotating member 4, the magnetic yoke member 5 is one or a combination of a plate member perpendicular to the radial direction of the rotating member 4, a barrel member along the radial direction of the rotating member 4 and a column member along the radial direction of the rotating member 4, specifically, as shown in fig. 2, the magnetic yoke member 5 at one end of the measuring coil 3 away from the rotating member 4 is only a plate member perpendicular to the axial direction of the measuring coil 3, and the plate member is in contact engagement with the end part of the soft magnetic core 2; as shown in fig. 3, the yoke member 5 disposed at one end of the measuring coil 3 far from the rotating member 4 includes a plate member perpendicular to the axial direction of the measuring coil 3 and a barrel member along the axial direction of the measuring coil 3, which are sequentially disposed along the axial direction of the measuring coil 3, the plate member is in contact engagement with the end portion of the soft magnetic core 2, and the end portion of the barrel member is in contact engagement with the plate member.
The magnetic yoke piece 5 arranged at one end of the measuring coil 3 far away from the rotating piece 4 also plays a role of restraining a concentrated magnetic field, and the magnetic yoke piece 5 collects the magnetic field scattered in the space and conducts the magnetic field into the soft magnetic core 2 in a concentrated manner, so that the magnetic field intensity in the soft magnetic core 2 is enhanced;
the key of influencing the magnitude of the induced voltage generated in the measuring coil 3 lies in the change condition of the magnetic field component on the soft magnetic core 2 along the axial direction of the measuring coil 3, and the magnetic yoke piece 5 is arranged at one end of the measuring coil 3 far away from the rotating piece 4, so that the magnetic field passing through the soft magnetic core 2 can be oriented orderly and consistent, the component change rate of the magnetic flux passing through the measuring coil 3 in the axial direction of the measuring coil 3 is increased, further, the induced electromotive force generated by the measuring coil 3 is larger, and the output voltage is effectively improved.
EXAMPLE III
As shown in fig. 4, on the basis of the first embodiment, a yoke member 5 is disposed at an end of the measuring coil 3 away from the rotating member 4, the yoke member 5 is a plate member perpendicular to a radial direction of the rotating member 4, and the yoke member 5 in the form of a plate member extends along a radial direction side of the measuring coil 3, so that a surface area of the plate member is increased, the plate member can cover a wider area, and the yoke member 5 disposed at an end of the measuring coil 3 away from the rotating member 4 can collect and conduct a magnetic field spread in the wider area into the soft magnetic core 2, thereby further enhancing a magnetic field strength in the soft magnetic core 2, so as to better increase an output voltage of the measuring coil without changing a magnetic performance of the permanent magnet at a certain installation distance, and provide an alternative optimization approach for increasing a detection distance or reducing a magnetic field strength of the permanent magnet itself.
The magnetic rotation speed sensor without a yoke shown in fig. 5, as compared to the first embodiment, the magnetic rotation speed sensor without a yoke has a yoke removed, the magnetic rotation speed sensor without a yoke only includes a permanent magnet 1 and a coil assembly, the permanent magnet 1 is disposed on a rotating member 4 to rotate together with the rotating member 4, the permanent magnet 1 is disposed at intervals along the rotating direction of the rotating member 4, the coil assembly is disposed on one side of the rotating member 4 in the radial direction, the coil assembly includes a soft magnetic core 2 and a measuring coil 3 wound on the soft magnetic core 2, and the output voltage signal pattern of the magnetic rotation speed sensor without a yoke is as shown in fig. 6, and the peak-to-peak value of the voltage is 594.3mV; fig. 7 is a graph of an output voltage signal of the magnetic tachometer sensor of the first embodiment, in which the peak-to-peak voltage value is 662.6mV, which is increased by 11.4% compared with the output voltage of the magnetic tachometer sensor without the yoke; fig. 8 is a graph of an output voltage signal of the magnetic tachometer sensor shown in fig. 2 in the second embodiment, where the peak-to-peak voltage value is 789.2mV, which is increased by 32.8% compared with the output voltage of the magnetic tachometer sensor without the yoke; fig. 9 is a graph of an output voltage signal of the magnetic tachometer sensor shown in fig. 3 in the second embodiment, in which the peak-to-peak voltage value is 979.4mV, which is increased by 64.8% compared with the output voltage of the magnetic tachometer sensor without the yoke; fig. 10 is a graph of an output voltage signal of the magnetic rotation speed sensor according to the third embodiment, in which a peak-to-peak voltage value is 949.8mV, which is increased by 59.8% compared to the output voltage of the magnetic rotation speed sensor without a yoke, and thus, it can be seen that the output voltage can be increased to different degrees by using various types of yokes, and the magnetic rotation speed sensor can be flexibly designed as required.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the 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 these modifications and adaptations should be considered within the scope of the invention.
Claims (5)
1. A magnetic speed sensor is characterized by comprising a permanent magnet (1) and a coil assembly, wherein the permanent magnet (1) is arranged on a rotating piece (4) to rotate along with the rotating piece, the permanent magnet (1) is provided with a plurality of permanent magnets at intervals along the circumferential direction of the rotating piece (4), the coil assembly is arranged on one radial side of the rotating piece (4), the coil assembly comprises a soft magnetic core (2) and a measuring coil (3) wound on the soft magnetic core (2), two axial ends of the measuring coil (3) are respectively provided with a magnetic yoke piece (5) used for guiding a magnetic field into the soft magnetic core (2), and the magnetic yoke piece (5) is made of a soft magnetic material, the axial of measuring coil (3) is along rotating the radial of piece (4) measuring coil (3) is close to the one end that rotates piece (4) and is provided with yoke spare (5), and this yoke spare (5) are perpendicular to rotate the piece (4) radial and soft magnetic core (2) tip contact linking plate the yoke spare (5) that one end that rotates piece (4) was kept away from in measuring coil (3) include along rotating piece (4) radial perpendicular to that sets gradually rotate piece (4) radial plate and along rotating piece (4) radial barrel spare, the plate links up with soft magnetic core (2) tip contact, the tip and the plate contact of barrel spare link up.
2. A magnetic speed sensor according to claim 1, characterized in that the magnetic pole direction of the permanent magnet (1) is in the radial direction of the rotating member (4).
3. A magnetic speed sensor according to claim 2, characterized in that the magnetic directions of adjacent permanent magnets (1) are opposite.
4. A magnetic speed sensor according to claim 1, characterised in that the cross-sectional dimension of the yoke element (5) in the direction perpendicular to the axial direction of the measuring coil (3) is larger than the cross-sectional dimension of the soft-magnetic core (2) in the direction perpendicular to the axial direction of the measuring coil (3).
5. A magnetic speed sensor according to claim 1, characterized in that the yoke member (5) in the form of a plate extends along one radial side of the measuring coil (3).
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| 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 |
| 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 |
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