CN114778882B - Variable magnetic flux rotation speed sensor - Google Patents
Variable magnetic flux rotation speed sensor Download PDFInfo
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- CN114778882B CN114778882B CN202210702082.9A CN202210702082A CN114778882B CN 114778882 B CN114778882 B CN 114778882B CN 202210702082 A CN202210702082 A CN 202210702082A CN 114778882 B CN114778882 B CN 114778882B
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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
Abstract
The invention discloses a variable magnetic flux speed sensor, which comprises a trigger wheel, a coil component and a permanent magnet, wherein the coil component comprises a soft magnetic core and a measuring coil wound on the soft magnetic core, the trigger wheel is connected to a rotating object to be measured and rotates along with the soft magnetic core, the permanent magnet is positioned on one side of the trigger wheel in the radial direction, the coil component is positioned between the permanent magnet and the trigger wheel, a magnetic field flow guide component made of a soft magnetic material is arranged between the coil component and the permanent magnet, and the magnetic field flow guide component changes the magnetic field distribution around the permanent magnet so as to effectively guide the magnetic field of the permanent magnet into the soft magnetic core. The variable flux rotation speed sensor utilizes the magnetic field flow guide component to apply the permanent magnet to the magnetic field on the side where the trigger wheel is located, so that the magnetic field passing through the measuring coil is fully guided into the soft magnetic core, the output voltage is increased, the internal resistance of a product is reduced, the load capacity of the product is improved, the space is effectively utilized, the miniaturization can be realized, and the output voltage can meet the application 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
Traditional magnetic flux change speed sensor includes the trigger wheel, soft magnetic core, measurement coil and permanent magnet, the measurement coil coiling is on soft magnetic core, the trigger wheel is installed and is rotated the object in order to rotate the object along with being surveyed on being surveyed rotation object, soft magnetic core, measurement coil is located between trigger wheel and the permanent magnet, the permanent magnet is motionless that stews, when the trigger wheel rotates, air gap magnetic resistance changes, lead to changing through measurement coil's magnetic flux, thereby produce induced electromotive force on measurement coil, and then produce alternating current signal in measurement coil, alternating current signal in the detection measurement coil then can derive the rotational speed of trigger wheel.
The existing variable magnetic flux rotating speed sensor is difficult to meet the requirement of miniaturization development, when the size of the variable magnetic flux rotating speed sensor is reduced, the sizes of devices of a measuring coil and a permanent magnet are obviously reduced, the magnetic flux change rate of the measuring coil is obviously reduced, the output voltage of the measuring coil is obviously reduced, and the requirements of high voltage and strong load capacity of an electrical signal of an airborne product of an aircraft cannot be met.
Disclosure of Invention
The invention aims to solve the technical problems and provide a variable magnetic flux rotating speed sensor which aims to improve the prior art and solve the problems that the variable magnetic flux rotating speed sensor in the prior art is difficult to effectively miniaturize, the output voltage is obviously reduced during miniaturization, and the application requirements cannot be met.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a become magnetic flux revolution speed sensor, includes trigger wheel, coil pack and permanent magnet, the coil pack includes soft magnetic core and the measurement coil of coiling on soft magnetic core, the trigger wheel is used for connecting and is surveyed and rotate together on the rotating object, the permanent magnet is located the radial one side of trigger wheel, the coil pack is located between permanent magnet and the trigger wheel, the coil pack with be provided with the magnetic field water conservancy diversion component of being made by soft magnetic material between the permanent magnet, magnetic field water conservancy diversion component changes the magnetic field distribution around the permanent magnet and leads the magnetic field of permanent magnet into soft magnetic core effectively. The variable magnetic flux speed sensor utilizes the magnetic field flow guide component to change the magnetic field distribution applied between the trigger wheel and the permanent magnet by the permanent magnet, and the magnetic field flow guide component forms a magnetic path for guiding the magnetic field, so that the magnetic field can be more effectively and more intensively applied to the coil component, the magnetic field in the soft magnetic core wound with the measuring coil is optimized, namely the magnetic field penetrating through the measuring coil is optimized, the magnetic flux change rate in the measuring coil is favorably increased, the output voltage is increased, the internal resistance of a product is reduced, the load capacity of the product is improved, the space is effectively utilized, the miniaturization can be realized, and the output voltage can meet the application requirement.
Furthermore, the axial perpendicular to of measuring coil triggers the wheel radially, soft magnetic core is including penetrating the core in measuring coil, and soft magnetic core can carry out the magnetic conduction for produce bigger magnetic induction intensity in the measuring coil, be favorable to reducing the whole volume that becomes magnetic flux speed sensor.
Furthermore, the soft magnetic core also comprises an end body which is connected with the core body and is positioned at the axial end side of the measuring coil, a magnetic field is guided into the core body along a path formed by the connection of the magnetic field flow guide member and the end body, and a primary magnetic field generated by the permanent magnet is more effectively conducted and applied to the core body through the guiding effect of the magnetic field flow guide member and the end body, so that a magnetic field with a more ordered orientation is formed on the core body, the magnetic field passing through the measuring coil is effectively optimized, the increase of the magnetic flux change rate in the measuring coil is facilitated, and the output voltage is effectively improved.
Furthermore, the magnetic field flow guide component is in contact connection with the soft magnetic core, and the magnetic field flow guide component is in contact connection with the permanent magnet. The magnetic field guiding and restraining device is favorable for better guiding and restraining the magnetic field, so that the magnetic field can be more intensively conducted to the soft magnetic core along the magnetic field guiding component, the magnetic field passing through the measuring coil is better optimized, the structure compactness is improved, the space is utilized to the maximum extent, the structure compactness is improved, the occupied volume is reduced, and the requirement of miniaturization development is met.
Further, magnetic field water conservancy diversion component includes the main part, the main part covers the surface towards trigger wheel one side of permanent magnet, and the main part intercepts the primary magnetic field that the permanent magnet applyed towards trigger wheel one side, and the main part changes the magnetic field distribution that the permanent magnet applyed towards trigger wheel one side, and the magnetic field is retrained and is conducted in magnetic field water conservancy diversion component, and the magnetic field is effectively and abundant guide goes into soft magnetic core along magnetic field water conservancy diversion component, is favorable to better optimization magnetic field, increase the magnetic field rate of change through the measuring coil to improve output voltage.
Furthermore, the main body part is in a flat plate shape, so that the structure is simple and the implementation is easy.
Further, the thickness of the main body part in the radial direction of the trigger wheel is reduced along the direction from the position close to the joint of the magnetic field flow guide component and the soft magnetic core to the position far away from the joint of the magnetic field flow guide component and the soft magnetic core, the main body part can better guide the primary magnetic field applied to one side of the trigger wheel to the permanent magnet, so that the magnetic field generated by the permanent magnet can be more fully guided into the soft magnetic core, the magnetic field change rate of the measuring coil is increased, the output voltage is improved, the material consumption of the main body part is less, the occupied space is smaller, the number of turns of the measuring coil is increased, and the output voltage is improved.
Furthermore, the thickness of the main body part is smoothly and gradually changed, the gradient distribution of the magnetic field at each position of the magnetic path is reduced, and the magnetic field can be better guided to the soft magnetic core.
Further, the magnetic field diversion component further comprises an extension part extending from the main body part, the extension part extends to be in contact connection with the soft magnetic core, the magnetic field generated by the permanent magnet is intercepted by the main body part and then effectively guided to the soft magnetic core along the path of the main body part and the extension part, the magnetic field passing through the measuring coil is effectively optimized, and the output voltage is increased.
Compared with the prior art, the invention has the advantages that:
the variable flux rotation speed sensor utilizes the magnetic field flow guide component to effectively guide the magnetic field, which is applied to one side of the trigger wheel by the permanent magnet, into the soft magnetic core, optimizes the magnetic field penetrating through the measuring coil, increases the magnetic flux change rate in the measuring coil, increases the output voltage, reduces the internal resistance of the product, improves the load capacity of the product, effectively utilizes the space, can realize miniaturization, and ensures that the output voltage can meet the application requirement.
Drawings
FIG. 1 is a schematic structural diagram of a variable flux tachometer according to the present invention;
FIG. 2 is a schematic diagram of a magnetic field distribution of a conventional variable flux tachometer of the prior art;
FIG. 3 is a schematic diagram of the magnetic field distribution of the variable flux tachometer sensor of the present invention;
FIG. 4 is a graph of output signal data from a conventional variable flux tachometer of the prior art;
FIG. 5 is a data diagram of the output signal of the variable flux tachometer sensor of the present invention;
fig. 6 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a variable magnetic flux rotation speed sensor according to a fourth embodiment of the present invention;
fig. 9 is a schematic structural diagram of another variable magnetic flux speed sensor according to a fourth embodiment of the present invention.
In the figure:
1 is a trigger wheel, 2 is a permanent magnet, 3 is a soft magnetic core, 31 is a core body, 32 is an end body, 4 is a measuring coil, 5 is a magnetic field flow guide component, 51 is a main body part, and 52 is an extension part.
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.
The variable flux speed sensor disclosed by the embodiment of the invention changes the magnetic field distribution condition of the permanent magnet by using the magnetic field flow guide component, guides the magnetic field into the soft magnetic core by using the magnetic field flow guide component, optimizes the magnetic field of the measuring coil, improves the output voltage, is convenient for the signal acquisition of the acquisition unit, reduces the internal resistance of a product, improves the load capacity of the product, and meets the application requirement of high output voltage while realizing miniaturization.
Example one
As shown in fig. 1, a variable flux rotation speed sensor mainly comprises a trigger wheel 1, a coil assembly and a permanent magnet 2, wherein the coil assembly comprises a soft magnetic core 3 and a measuring coil 4 wound on the soft magnetic core 3, the trigger wheel 1 is used for being connected to a rotating object to be measured to rotate along with the soft magnetic core 3, the permanent magnet 2 is positioned on one radial side of the trigger wheel 1, the coil assembly is positioned between the permanent magnet 2 and the trigger wheel 1, a magnetic field diversion member 5 made of soft magnetic material is arranged between the coil assembly and the permanent magnet 2, the magnetic field diversion member 5 changes the magnetic field distribution around the permanent magnet 2 so as to effectively guide the magnetic field of the permanent magnet 2 into the soft magnetic core 3, the magnetic field diversion member 5 intercepts the primary magnetic field applied by the permanent magnet 2 on one side facing the trigger wheel 1, the magnetic field distribution applied by the permanent magnet 2 on one side facing the trigger wheel 1 is changed under the action of the magnetic field diversion member 5, the magnetic field is conducted along a magnetic circuit formed by the magnetic field flow guide member 5, the magnetic field is guided into the soft magnetic core 3 from the magnetic field flow guide member 5, the magnetic field can be more effectively and more intensively applied to the soft magnetic core 3, the magnetic field penetrating through the measuring coil is further optimized, the change rate of the magnetic flux penetrating through the measuring coil is increased, the output voltage is increased, the internal resistance of a product is reduced, and the load capacity of the product is improved.
In this embodiment, the magnetic pole direction of the permanent magnet 2 is along the radial direction of the trigger wheel 1, the permanent magnet 2 can apply a stronger magnetic field on one side facing the trigger wheel 1, the axial direction of the measuring coil 4 is perpendicular to the radial direction of the trigger wheel 1, the soft magnetic core 3 includes a core body 31 penetrating into the measuring coil 4, the soft magnetic core 3 further includes an end body 32 connected with the core body 31 and located at the axial end side of the measuring coil 4, the measuring coil 4 can be only provided with one, or a plurality of measuring coils 4 are provided at intervals along the same axis, when only one measuring coil 4 is provided, the end body 32 is respectively provided at two axial ends of the measuring coil 4, the end body 32 and the core body 31 are combined to form the soft magnetic core 3 of an i-shaped structure, when a plurality of measuring coils 4 are provided along the same axis, the measuring coil 4 can be wound on the same core body 31, the end body 32 is only provided at the outer end of the measuring coil 4 located at the end side, it can also be expressed that the end bodies 32 are respectively arranged at two ends of the core body 31, so that the end bodies 32 and the core body 31 are also combined to form the soft magnetic core 3 with an i-shaped structure;
the end body 32 extends along the radial direction of the measuring coil 4 to be connected with the magnetic field flow guide member 5, a magnetic field generated by the permanent magnet 2 is conducted along a magnetic path formed by the connection of the magnetic field flow guide member 5 and the end body 32 and enters the core body 31, a magnetic field with a more ordered orientation is generated on the core body 31, the magnetic field passing through the measuring coil 4 is effectively optimized, the output voltage is effectively improved, the internal resistance of a product is reduced, and the load capacity of the product is improved;
in this embodiment, the magnetic field guiding member 5 comprises a main body part 51, the main body part 51 is arranged on one side surface of the permanent magnet 2 facing the trigger wheel 1, moreover, the main body part 51 covers the whole end surface of the permanent magnet 2 facing the soft magnetic core 3, the main body part 51 is specifically in a flat plate shape, the magnetic field flow guide member 5 can be specifically made of soft magnetic materials such as electrician pure iron and 1J50, the main body part 51 fully intercepts the primary magnetic field applied by the permanent magnet on the side facing the trigger wheel, the magnetic field distribution is changed so that the magnetic field is constrained in the magnetic field flow guide member 5 and is conducted to the soft magnetic core 3 along the magnetic field flow guide member 5, and specifically, the main body part 51 is in contact connection with the surface of the permanent magnet 2, and the main body part 51 is in contact engagement with the end body 32 of the soft magnetic core 3, which is favorable for good conduction of a magnetic field, and also improves the compactness of the structure, which is favorable for reducing the volume and realizing miniaturization.
The distribution of the magnetic field of the conventional flux-changing rotation speed sensor in the prior art is shown in fig. 2, the permanent magnet 2 applies a magnetic field on the side facing the trigger wheel 1, wherein the magnetic field part of the end body 32 close to the soft magnetic core 3 is conducted along the end body 32, and the magnetic field part of the end body 32 far away from the soft magnetic core 3 (i.e. the magnetic field part of the permanent magnet 2 facing the central area of the side of the trigger wheel 1) is directly conducted towards the trigger wheel 1, so that the orientation of the magnetic field on the core body 31 of the soft magnetic core 3 is disordered, the measuring coil 4 is wound on the core body 31, and the key to influencing the magnitude of the induced voltage generated in the measuring coil 4 is the change condition of the magnetic field component on the core body 31 along the axial direction of the measuring coil 4, when the trigger wheel 1 rotates, the air gap reluctance changes, which can cause the magnetic field on the core body 31 to change, because the orientation of the magnetic field on the core body 31 is disordered, therefore, the change rate of the component of the magnetic flux of the measuring coil 4 in the axial direction of the measuring coil 4 is small, and further the induced electromotive force generated by the measuring coil 4 is small, namely the output voltage of the measuring coil 4 is low, and the variable magnetic flux speed sensor with the existing structure has the condition of undersize output voltage when being miniaturized, so that the application requirements of small size and high output voltage cannot be met.
The magnetic field distribution of the variable flux speed sensor in this embodiment is as shown in fig. 3, a permanent magnet 2 applies a magnetic field on a side facing a trigger wheel 1, the magnetic field is intercepted by a magnetic field flow guide member 5, the magnetic field distribution applied on the side facing the trigger wheel 1 by the permanent magnet 2 is changed, the magnetic field flow guide member 5 is a magnetic conductive member made of a soft magnetic material, the magnetic field is conducted along the magnetic field flow guide member 5, a magnetic field portion of an end body 32 close to a soft magnetic core 3 penetrates out of the magnetic field flow guide member 5 and then is conducted along the end body 32, a magnetic field portion of the end body 32 far from the soft magnetic core 3 is turned under the action of the magnetic field flow guide member 5 and is conducted along the magnetic field flow guide member 5 and enters the end body 32, that is, the direction of the magnetic field portion of a central area of the permanent magnet 2 facing the trigger wheel 1 is changed, the magnetic field originally facing the trigger wheel 1 is bent, and the magnetic force lines are bent toward the direction of the end body 32, the magnetic field direction is changed to be vertical to the radial direction of the trigger wheel 1, the magnetic field is conducted along the magnetic field flow guide member 5, when the magnetic field is conducted to the position of the end body 32, the magnetic field direction is bent and turned again to enter the end body 32, specifically, the end body 32 of the soft magnetic core 3 is close to the edges of two sides of the permanent magnet 2, so that the magnetic field of the permanent magnet 2 facing the central area of one side of the trigger wheel 1 is bent towards two sides and then is led into the end body 32 of the soft magnetic core 3, the magnetic field applied to one side of the permanent magnet 2 facing the trigger wheel 1 is restrained by the magnetic circuit formed by the magnetic field flow guide member 5 to conduct, compared with the magnetic field distribution of the traditional flux-changing rotating speed sensor shown in figure 2, the magnetic field applied to the core body 31 of the soft magnetic core 3 is more orderly and consistent after the magnetic field flow guide member 5 is added, and further, when the trigger wheel 1 rotates, the magnetic field on the core body 31 of the soft magnetic core 3 can be changed more obviously, the magnetic flux of measuring coil 4 is great in the ascending component rate of change of measuring coil 4 axial, and then can make the induced electromotive force that measuring coil 4 produced great, and also the output voltage of measuring coil 4 is high, and the guarantee possesses high output voltage when can realizing reducing the structure size of becoming magnetic flux speed sensor, satisfies the demand of miniaturized development.
Under other certain geometric constraint conditions, the output voltage of the measuring coil of the conventional flux-varying rotation speed sensor changes with time as shown in fig. 4, the peak value of the forward voltage is 0.828V, and the peak value of the reverse voltage is-0.830V, so that the peak-peak value of the voltage of the conventional flux-varying rotation speed sensor in the prior art is about 1.658V, the output voltage of the measuring coil of the flux-varying rotation speed sensor of the present embodiment changes with time as shown in fig. 5, the peak value of the forward voltage is 1.184V, and the peak value of the reverse voltage is 1.174V, so that the peak-peak value of the voltage of the flux-varying rotation speed sensor of the present embodiment is about 2.358V, the output voltage is increased by 42%, and the magnetic field diversion member 5 plays an optimization role in magnetic field distribution, improves space utilization rate, can obtain higher voltage, and lower product internal resistance.
Example two
As shown in fig. 6, the difference from the first embodiment is that the main body 51 of the magnetic field flow guiding member 5 has a special-shaped structure, the thickness of the main body 51 in the radial direction of the trigger wheel 1 decreases along the direction from the junction of the magnetic field flow guiding member 5 and the soft magnetic core 3 to the junction of the magnetic field flow guiding member 5 and the soft magnetic core 3, specifically, the thickness of the main body 51 is the largest at the position where the main body 51 is joined to the end 32 of the soft magnetic core 3, and the thickness of the main body 51 away from the junction of the main body 51 and the end 32 of the soft magnetic core 3 decreases smoothly (may be a linear decrease or a curvilinear decrease), the end 32 of the soft magnetic core 3 in the present embodiment is close to the edges at both sides of the permanent magnet 2, so that the thickness of the main body 51 close to both sides of the permanent magnet 2 is large, and the thickness near the central area of the permanent magnet 2 decreases linearly, which can reduce the material consumption of the magnetic field flow guiding member 5, the cost is reduced, the area with the reduced thickness of the main body part 51 just faces the measuring coil 4, more space is reserved for the measuring coil 4, and the number of turns of the measuring coil 4 is increased under the condition that the whole volume is not increased;
and, due to the existence of the main body part 51 of the magnetic field guiding member 5, the magnetic field distribution is changed, and the magnetic field is conducted along the magnetic field guiding member 5, so that the magnetic flux in the main body part 51 is maximum at the junction of the main body part 51 and the end body 32, and the magnetic flux far away from the junction of the main body part 51 and the end body 32 is gradually reduced, therefore, the thickness of the junction of the main body part 51 and the end body 32 is maximum to ensure that the magnetic field is effectively constrained to be conducted in the magnetic circuit.
EXAMPLE III
As shown in fig. 7, the difference from the first embodiment is that end bodies 32 are also arranged between the measuring coils 4 arranged at intervals along the same axis, which is equivalent to that the soft magnetic cores 3 of the i-shaped structure are connected in series, in this embodiment, two measuring coils 4 are arranged at intervals, and three end bodies 32 are arranged in total, so that the soft magnetic cores 3 are in a shape like a Chinese character 'wang', and the variable flux rotation speed sensor with such a structure can also optimize the magnetic field passing through the measuring coils, increase the output voltage, reduce the internal resistance of the product, and improve the load capacity of the product.
Example four
As shown in fig. 8 and 9, the difference from the first embodiment is that the soft magnetic core is only provided with the core body 31 penetrating into the measuring coil 4, and the magnetic field guiding member 5 further includes an extension portion 52 extending from the main body portion 51, the extension portion 52 extends to be in contact engagement with the soft magnetic core 3, specifically, the extension portion 52 extends toward the side where the coil assembly is located along the radial direction of the trigger wheel 1, two ends of the core body 31 are respectively connected with one extension portion 52, the magnetic field applied to the side facing the trigger wheel 1 by the permanent magnet 2 is conducted along the path from the main body portion 51 to the extension portion 52 to be applied to the core body 31, and the magnetic field applied to the core body 31 of the soft magnetic core is also oriented orderly and uniform, so as to achieve the purpose of optimizing the magnetic field passing through the measuring coil 4, increasing the output voltage, reducing the internal resistance of the product, and improving the load capacity of the product. As shown in fig. 8, the main body 51 may be a flat plate, and as shown in fig. 9, the main body 51 may also be a profile structure in the second embodiment.
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 (8)
1. A variable magnetic flux rotation speed sensor is characterized by comprising a trigger wheel (1), a coil component and a permanent magnet (2), the coil component comprises a soft magnetic core (3) and a measuring coil (4) wound on the soft magnetic core (3), the trigger wheel (1) is connected with a rotating object to be tested to rotate along with the rotating object, the permanent magnet (2) is positioned on one side of the trigger wheel (1) in the radial direction, the coil component is positioned between the permanent magnet (2) and the trigger wheel (1), a magnetic field flow guide component (5) made of soft magnetic material is arranged between the coil component and the permanent magnet (2), the magnetic field flow guide component (5) is contacted and connected with the soft magnetic core (3), the magnetic field flow guide component (5) is contacted and connected with the permanent magnet (2), the magnetic field guide member (5) changes the magnetic field distribution around the permanent magnet (2) to effectively guide the magnetic field of the permanent magnet (2) into the soft magnetic core (3).
2. Variable magnetic flux speed sensor according to claim 1, wherein the axial direction of the measuring coil (4) is perpendicular to the radial direction of the trigger wheel (1), and the soft magnetic core (3) comprises a core body (31) penetrating into the measuring coil (4).
3. A variable flux rate sensor according to claim 2, wherein the soft-magnetic core (3) further comprises end bodies (32) connected to the core body (31) and located at the axial end sides of the measuring coil (4), the magnetic field being guided into the core body (31) along a path defined by the magnetic field guiding member (5) engaging with the end bodies (32).
4. A variable flux rate sensor according to any one of claims 1 to 3, wherein the magnetic field guide member (5) comprises a main body portion (51), the main body portion (51) covering a surface of the permanent magnet (2) facing the side of the trigger wheel (1).
5. A variable magnetic flux rate sensor according to claim 4, wherein the main body portion (51) is in the form of a flat plate.
6. A variable magnetic flux speed sensor according to claim 4, wherein the thickness of the main body portion (51) in the radial direction of the trigger wheel (1) decreases in a direction from close to the junction of the magnetic field guiding member (5) and the soft magnetic core (3) to far from the junction of the magnetic field guiding member (5) and the soft magnetic core (3).
7. A variable magnetic flux rate sensor according to claim 6, wherein the thickness of the main body portion (51) is smoothly graded.
8. A variable magnetic flux speed sensor according to claim 4, wherein the magnetic field flow guide member (5) further comprises an extension portion (52) extending from the main body portion (51), the extension portion (52) extending into contacting engagement with the soft magnetic core (3).
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| CN115060924B (en) * | 2022-08-18 | 2022-11-11 | 四川新川航空仪器有限责任公司 | Magnetic shielding-based rotation 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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| CN114778882A (en) | 2022-07-22 |
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