WO2023223389A1 - 回転数検出器 - Google Patents

回転数検出器 Download PDF

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Publication number
WO2023223389A1
WO2023223389A1 PCT/JP2022/020409 JP2022020409W WO2023223389A1 WO 2023223389 A1 WO2023223389 A1 WO 2023223389A1 JP 2022020409 W JP2022020409 W JP 2022020409W WO 2023223389 A1 WO2023223389 A1 WO 2023223389A1
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WO
WIPO (PCT)
Prior art keywords
magnetic pole
pole part
magnetic
rotation speed
speed detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/020409
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English (en)
French (fr)
Japanese (ja)
Inventor
敏男 目片
武史 武舎
仁 長谷川
琢也 野口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2022/020409 priority Critical patent/WO2023223389A1/ja
Priority to CN202280070209.8A priority patent/CN118119825B/zh
Priority to US18/707,180 priority patent/US12216138B2/en
Priority to JP2022562859A priority patent/JP7209911B1/ja
Publication of WO2023223389A1 publication Critical patent/WO2023223389A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/4815—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals using a pulse wire sensor, e.g. Wiegand wire
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • 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
    • 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
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • 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
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets

Definitions

  • the present disclosure relates to a rotation speed detector that detects the rotation speed indicating the rotation speed of a rotating body.
  • Patent Document 1 discloses a rotation speed detector that includes a first magnetic pole part with a north pole on the outer circumferential side, a second magnetic pole part with an south pole on the outer circumferential side, and a power generation element. The rotation speed detector disclosed in Patent Document 1 detects the magnetic field applied to the magnetic wire of the power generating element when the magnetic pole facing the power generating element switches from one of the first magnetic pole part and the second magnetic pole part to the other.
  • a power generation pulse is generated by reversing the magnetization of the magnetic wire.
  • the rotational speed of the rotating body is detected by attaching a rotational speed detector to the rotating body and measuring the number of power generation pulses due to magnetization reversal.
  • the rotation speed detector disclosed in Patent Document 1 the first magnetic pole part and the second magnetic pole part are arranged adjacent to each other without any gap. Therefore, in the rotation speed detector disclosed in Patent Document 1, when the magnetic pole part facing the power generating element switches from one of the first magnetic pole part and the second magnetic pole part to the other, The direction of the applied magnetic field changes rapidly. Therefore, in the rotation speed detector disclosed in Patent Document 1, the rotation speed detector is attached with the boundary between the first magnetic pole part and the second magnetic pole part facing the power generating element. When vibration occurs in the body, magnetic fields of a certain magnitude or more and different directions are alternately and repeatedly applied to the magnetic wire. For this reason, in the rotation speed detector disclosed in Patent Document 1, the rotating body attached with the boundary between the first magnetic pole part and the second magnetic pole part facing the power generation element vibrates in the rotation direction. Then, rotation of the rotating body is detected even though the rotation is stopped.
  • the rotation speed detector disclosed in Patent Document 1 sometimes incorrectly detects the rotation of the rotation body when vibration in the rotation direction occurs in the rotation body to which the rotation speed detector is attached. .
  • the present disclosure has been made in view of the above, and it is an object of the present disclosure to provide a rotation speed detector that is unlikely to misdetect the rotation of a rotating body even if vibration in the rotational direction occurs in the attached rotating body.
  • a rotation speed detector includes a non-magnetic base material attached to a rotating body, and an arcuate band-like material with the N pole on the outer circumferential side and the S pole on the inner side.
  • the first magnetic pole part is installed on the base material as the circumferential side
  • the second magnetic pole part is in the shape of an arc band and is installed on the base material with the S pole on the outer peripheral side and the N pole on the inner peripheral side, and the large Barkhausen effect.
  • the power generation element includes a magnetic wire that generates a magnetic wire and a pickup coil that detects magnetization reversal of the magnetic wire.
  • the power generating element is installed facing the first magnetic pole part and the second magnetic pole part so that the longitudinal direction of the magnetic wire is along the radial direction of the first magnetic pole part and the second magnetic pole part.
  • a nonmagnetic gap portion is provided between the first magnetic pole portion and the second magnetic pole portion.
  • the rotational speed detector according to the present disclosure has the effect that even if vibration in the rotational direction occurs in the attached rotating body, the rotation of the rotating body is unlikely to be erroneously detected.
  • a diagram showing the configuration of a rotation speed detector according to Embodiment 1 A diagram showing an example of a magnetic field generated by the rotation speed detector according to Embodiment 1.
  • a diagram showing the configuration of a rotation speed detector according to a modification of the first embodiment A diagram showing the configuration of a rotation speed detector according to Embodiment 2
  • FIG. 1 is a diagram showing the configuration of a rotation speed detector according to the first embodiment.
  • the rotation speed detector 10 according to the first embodiment includes a base material 1 fixed to a rotating body such as a shaft, a first magnetic pole part 2 and a second magnetic pole part 3 installed on the base material 1, and a first magnetic pole part 2 and a second magnetic pole part 3 installed on the base material 1.
  • a power generating element 4 installed opposite the magnetic pole part 2 and the second magnetic pole part 3, a counter IC (Integrated Circuit) 5 which operates in response to the power generation pulse generated by the power generating element 4, and a counter IC 5 that calculates the number of rotations. and a nonvolatile memory 6 into which data is written.
  • the rotation speed detector 10 measures the rotation speed of the rotating body by having the counter IC 5 update the rotation speed data in the nonvolatile memory 6 every time a power generation pulse is generated in the power generation element 4 .
  • Each of the first magnetic pole part 2 and the second magnetic pole part 3 has an arc band shape.
  • the first magnetic pole part 2 is magnetized so that the outer circumferential side is a north pole and the inner circumferential side is a south pole.
  • the second magnetic pole part 3 is magnetized so that the outer circumferential side is an S pole and the inner circumferential side is an N pole. That is, the first magnetic pole part 2 is magnetized radially outward, and the second magnetic pole part 3 is magnetized radially inward.
  • the black arrows in FIG. 1 indicate the respective magnetization directions of the first magnetic pole part 2 and the second magnetic pole part 3.
  • the outer diameter of the first magnetic pole part 2 and the outer diameter of the second magnetic pole part 3 are the same. Moreover, the inner diameter of the first magnetic pole part 2 and the inner diameter of the second magnetic pole part 3 are the same. The center of the arc of the inner and outer diameters of the first magnetic pole section 2 and the center of the arc of the inner and outer diameters of the second magnetic pole section 3 are the same.
  • the first magnetic pole part 2 and the second magnetic pole part 3 may be adhered to the base material 1 or may be integrally molded with the base material 1.
  • a gap 7 is provided between the first magnetic pole part 2 and the second magnetic pole part 3, through which the base material 1 is exposed.
  • the gap portion 7 is provided within a certain angular range with the center of the arc of the inner and outer diameters of the first magnetic pole portion 2 and the second magnetic pole portion 3 as the center point. Therefore, the gap 7 is narrower on the inner diameter side of the first magnetic pole part 2 and the second magnetic pole part 3, and wider on the outer diameter side.
  • the gap portion 7 is provided in an angular range of 20 degrees.
  • the power generation element 4 includes a magnetic wire 41 that produces a large Barkhausen effect, a pickup coil 42 that detects magnetization reversal of the magnetic wire 41, and a magnetic yoke 43 provided at both ends of the magnetic wire 41.
  • the power generating element 4 is installed such that the longitudinal direction of the magnetic wire 41 is along the radial direction of the first magnetic pole part 2 and the second magnetic pole part 3.
  • FIG. 1 shows a configuration in which three power generating elements 4 are installed, the number of power generating elements 4 is not limited to three. Furthermore, when three or more power generating elements 4 are installed, the intervals between the power generating elements 4 can be set arbitrarily.
  • the power generation element 4 generates a positive power generation pulse using a magnetic field with a magnetic flux density of +10 mT as a trigger, and generates a negative power generation pulse using a magnetic field with a magnetic flux density of -10 mT as a trigger. generate.
  • FIG. 2 is a diagram showing an example of a magnetic field generated by the rotation speed detector according to the first embodiment.
  • FIG. 2 also shows a magnetic field generated by a rotation speed detector according to a comparative example in which a gap is not formed between the first magnetic pole part and the second magnetic pole part.
  • the solid line is the magnetic field generated by the rotation speed detector 10 according to the first embodiment
  • the broken line is the magnetic field generated by the rotation speed detector according to the comparative example.
  • the first magnetic pole part 2 is arranged in the angular range from 10 degrees to 170 degrees, and the second magnetic pole part 3 is arranged in the angular range from 190 degrees to 350 degrees. It is located. Gap portions 7 are arranged between 350 degrees and 10 degrees and between 170 degrees and 190 degrees.
  • the first magnetic pole part is arranged in the angular range from 0 degrees to 180 degrees, and the second magnetic pole part is arranged in the angular range from 180 degrees to 360 degrees. There is.
  • the magnetic field rapidly changes from positive to negative or from negative to positive near the rotation angle of 0 degrees and around the rotation angle of 180 degrees. For this reason, in the rotation speed detector according to the comparative example, when the power generating element is facing a position near 0 degrees or 180 degrees, vibration amplitude of about 2 degrees in the rotation direction is applied to the rotating body. When vibration occurs, a magnetic field exceeding the trigger of ⁇ 10 mT is generated continuously, and multiple power generation pulses are generated within a period shorter than the rotation period of the rotating body. For this reason, in the rotation speed detector according to the comparative example, writing of data to the nonvolatile memory is performed continuously in a short period of time, and writing problems are likely to occur.
  • the gap part 7 is provided between the first magnetic pole part 2 and the second magnetic pole part 3, the magnetic field when the positive and negative sides of the magnetic field are switched.
  • the gradient of change is gentler than that of the rotation detector according to the comparative example, and the magnetic field exceeding ⁇ 10 mT, which is the trigger, is 8 degrees or less in the rotation direction of the rotating body around the 0 degree or 180 degree position. It does not occur due to vibrations of this magnitude. That is, in the rotation speed detector 10 according to the first embodiment, the gap 7 provided between the first magnetic pole part 2 and the second magnetic pole part 3 is the width of the vibration in the rotational direction that occurs in the rotating body. is set larger than .
  • the power generating element 4 faces the rotating body at a position around 0 degrees or 180 degrees. Even if vibration occurs with a vibration amplitude of about 2 degrees in the rotational direction, no power generation pulse is generated and no data is written to the nonvolatile memory 6. Therefore, reliability problems such as write failures occurring due to continuous rewriting of the nonvolatile memory 6 in a short period of time, and shortening of the lifespan of the nonvolatile memory 6 due to reaching the upper limit of the number of rewrites of the nonvolatile memory 6. There is no concern about deterioration.
  • the gap 7 is set to be larger than the vibration amplitude in the rotational direction generated in the rotating body. It is possible to suppress the generation of power generation pulses even if vibration in the rotational direction occurs in the rotating body in a state where the power generation elements 4 face each other at a position around 0 degrees or 180 degrees.
  • the rotation speed detector 10 has the gap 7 between the first magnetic pole part 2 and the second magnetic pole part 3, so that the power generation element 4 can be rotated at 0 degrees or Even if the rotating body vibrates in the rotational direction while facing at a position of around 180 degrees, generation of power generation pulses can be suppressed, and writing of data to the nonvolatile memory 6 can be suppressed. Therefore, reliability problems such as write failures occurring due to continuous rewriting of the nonvolatile memory 6 in a short period of time, and shortening of the lifespan of the nonvolatile memory 6 due to reaching the upper limit of the number of rewrites of the nonvolatile memory 6. It is possible to suppress the decline.
  • the angular position at which the triggering magnetic field is generated differs depending on whether the magnetic field changes from positive to negative or from negative to positive.
  • a -10 mT magnetic field is generated as a trigger when the rotation angle reaches 352 degrees
  • a +10 mT magnetic field is generated which acts as a trigger. Therefore, in the rotation speed detector 10 according to the first embodiment, the hysteresis H depending on the rotation direction of the rotating body is 16 degrees.
  • the hysteresis H can be increased and a magnetic field that becomes a trigger can be made less likely to occur.
  • the gap 7 between the first magnetic pole part 2 and the second magnetic pole part 3 is provided in an angular range of 20 degrees, but the angular range of the gap 7 is assumed to be 30 degrees.
  • FIG. 3 is a diagram showing the configuration of a rotation speed detector according to a modification of the first embodiment.
  • the first magnetic pole part 2 is composed of two magnets 21 and 22 magnetized in the thickness direction of the base material 1.
  • each of the second magnetic pole parts 3 is composed of two magnets 31 and 32 magnetized in the thickness direction of the base material 1.
  • the magnet 21 on the inner peripheral side of the first magnetic pole part 2 has an S pole on the side facing the power generation element 4.
  • the magnet 22 on the outer peripheral side of the first magnetic pole portion 2 has a north pole on the side facing the power generating element 4.
  • the magnet 31 on the inner circumferential side of the second magnetic pole portion 3 has a north pole on the side facing the power generation element 4 .
  • the magnet 32 on the outer circumferential side of the second magnetic pole portion 3 has an S pole on the side facing the power generation element 4 .
  • the circled x mark indicates that the magnetic flux is viewed along the traveling direction.
  • a circle surrounded by a circle indicates that the magnetic flux is viewed in a direction opposite to the traveling direction.
  • the rotation speed detector 10 Since the rotation speed detector 10 according to the first embodiment has the gap 7 between the first magnetic pole part 2 and the second magnetic pole part 3, the first magnetic pole part 2 and the second magnetic pole part Even if a minute vibration occurs at a position intermediate between the gap 7 and the gap 7, no power will be generated unless the vibration is at least half the size of the gap 7. Therefore, it is possible to suppress a decrease in reliability due to constant generation of power due to minute vibrations. Note that the amount of microvibration varies depending on the type of rotating body that is the source of vibration and the rotation control method, so if the size of the gap 7 is set appropriately according to the type of rotating body and the rotation control method, the decrease in reliability can be prevented. can be suppressed.
  • FIG. 4 is a diagram showing the configuration of a rotation speed detector according to the second embodiment.
  • the first magnetic pole portion 2 is composed of a plurality of bar magnets 23 arranged at intervals in an arc band shape.
  • the second magnetic pole portion 3 is composed of a plurality of bar magnets 33 arranged at intervals in an arc band shape.
  • the bar magnets 23 constituting the first magnetic pole part 2 are arranged so that the outer circumferential side thereof is a north pole and the inner circumferential side thereof is a south pole.
  • the bar magnets 33 constituting the second magnetic pole part 3 are arranged so that the outer circumferential side is an S pole and the inner circumferential side is an N pole. Bar magnets 23 and 33 forming each of the first magnetic pole part 2 and the second magnetic pole part 3 are arranged along the radial direction. Note that the black arrows in FIG. 4 indicate the respective magnetization directions of the first magnetic pole part 2 and the second magnetic pole part 3.
  • the bar magnets 23 and 33 constituting each of the first magnetic pole part 2 and the second magnetic pole part 3 may be magnetized after being installed on the base material 1, or magnetized in advance and placed side by side. It's okay.
  • the parts other than the first magnetic pole part 2 and the second magnetic pole part 3 are the same as the rotation speed detector 10 according to the first embodiment, and therefore a description thereof will be omitted.
  • the first magnetic pole part 2 and the second magnetic pole part 3 are each composed of eight bar magnets 23 and 33.
  • the width of each of the bar magnets 23 and 33 is 10 degrees in the rotational direction at the center in the radial direction.
  • the bar magnets 23 and 33 are arranged at a pitch of 20 degrees, and there is an interval of 10 degrees between the bar magnets 23 and between the bar magnets 33. That is, the same spacing as the magnet width is provided between the bar magnets 23 and between the bar magnets 33.
  • the bar magnets 23 of the first magnetic pole part 2 are arranged around positions of 20 degrees, 40 degrees, 60 degrees, 80 degrees, 100 degrees, 120 degrees, 140 degrees, and 160 degrees.
  • the bar magnets 33 of the second magnetic pole part 3 are arranged around positions of 200 degrees, 220 degrees, 240 degrees, 260 degrees, 280 degrees, 300 degrees, 320 degrees, and 340 degrees.
  • a gap 7 is formed between the first magnetic pole part 2 and the second magnetic pole part 3 in an angular range of 30 degrees.
  • the first magnetic pole part 2 is arranged in the angular range from 15 degrees to 165 degrees
  • the second magnetic pole part 3 is arranged in the angular range from 195 degrees to 345 degrees. It is located.
  • the gap portion 7 is provided between 345 degrees and 15 degrees and between 165 degrees and 195 degrees.
  • FIG. 5 is a diagram showing an example of a magnetic field generated by a bar magnet that constitutes the first magnetic pole part or the second magnetic pole part of the rotation speed detector according to the second embodiment.
  • the vertical axis in FIG. 5 represents the strength of the magnetic field in the radial direction, that is, the magnet longitudinal direction component, and the horizontal axis in FIG. 5 represents the position where the magnetic field strength was measured. It is expressed by the distance from the center of the width. Note that the distance from the center of the magnet width of the bar magnets 23 and 33 can be approximated by the distance in the rotation direction of the rotating body.
  • the width direction of the bar magnets 23 and 33 is a direction parallel to the surface of the base material 1 on which the first magnetic pole part 2 and the second magnetic pole part 3 are installed and perpendicular to the longitudinal direction of the bar magnets 23 and 33. It is. Further, the position at which the strength of the magnetic field is measured is fixed at a position away from the bar magnets 23 and 33 by a distance of half the magnet width toward the power generation element 4 in the direction perpendicular to the surface of the base material 1. . In FIG. 5, the peak value of the magnetic field is 80 mT, but the peak value changes depending on the material and thickness of the bar magnets 23, 33.
  • the magnetic fields generated by the bar magnets 23 and 33 have a relationship in which the half-width with respect to the peak value is approximately twice the magnet width, regardless of the absolute value of the peak value. That is, the half width, which is the dimension in the width direction of the bar magnets 23, 33 and is the dimension in the range where the magnetic field generated by the bar magnets 23, 33 is more than half of the peak, is approximately 2 times the width of the bar magnets 23, 33. It's double.
  • the half width which is the width at which a magnetic field of 40 mT, which is half the value of the peak value, is generated is twice the magnet width.
  • FIGS. 6 and 7 are diagrams showing an example of the magnetic field generated when three bar magnets constituting the first magnetic pole part or the second magnetic pole part of the rotation speed detector according to the second embodiment are arranged. be.
  • the vertical axis of FIGS. 6 and 7 represents the strength of the magnetic field in the radial direction, that is, the longitudinal direction of the magnet, and the horizontal axis of FIGS. 6 and 7 represents the position where the magnetic field strength was measured. It is expressed by the distance from the center of the magnet width of the magnets 23 and 33. Note that the distance from the center of the magnet width of the bar magnets 23 and 33 can be approximated by the distance in the rotation direction of the rotating body.
  • the width direction of the bar magnets 23 and 33 is a direction parallel to the surface of the base material 1 on which the first magnetic pole part 2 and the second magnetic pole part 3 are installed and perpendicular to the longitudinal direction of the bar magnets 23 and 33. It is. Further, the position at which the strength of the magnetic field is measured is fixed at a position away from the bar magnets 23 and 33 by a distance of half the magnet width toward the power generation element 4 in the direction perpendicular to the surface of the base material 1. .
  • FIG. 6 shows the magnetic field generated when three bar magnets 23, 33 are arranged with the same spacing as the magnet width.
  • FIG. 7 shows the magnetic field generated when three bar magnets 23, 33 are arranged with an interval twice the magnet width.
  • the spacing between the bar magnets 23, 33 is the same as the magnet width, the magnetic field exceeds 80 mT even at the bottom between the peaks, and a stronger magnetic force can be obtained than when there is only one bar magnet 23, 33. I understand that.
  • the spacing between the bar magnets 23 and 33 is twice the magnet width, three peaks are separated, and the magnetic field drops to about 10 mT at the bottom between the peaks. Therefore, if 20 mT of magnetic noise due to an external magnetic field is applied in the negative direction at the bottom of the peak, a -10 mT magnetic field will be applied to the magnetic wire 41, and the positive magnetic pole that should originally generate electricity and the negative magnetic noise will be applied to the magnetic wire 41. There is a possibility of erroneous power generation at a position that is not near the middle of the magnetic pole, and there is a problem that the number of rotations may be detected incorrectly.
  • FIG. 8 is a diagram showing an example of a magnetic field generated by the rotation speed detector according to the second embodiment.
  • the rotation speed detector 10 according to the second embodiment is resistant to magnetic noise caused by external magnetic fields because the magnetic field hardly drops in the portion where the first magnetic pole part 2 and the second magnetic pole part 3 are provided. structure, which can improve reliability.
  • the power generation element 4 generates a positive power generation pulse using a magnetic field with a magnetic flux density of +10 mT as a trigger, and generates a negative power generation pulse using a magnetic field with a magnetic flux density of -10 mT as a trigger.
  • a power generation pulse is generated by rotating ⁇ 10 degrees around 0 degrees or 180 degrees.
  • the hysteresis H in this case is 20 degrees, and similarly to the rotation speed detector 10 according to the first embodiment, the rotation direction of the rotating body is Even if a vibration of about 2 degrees occurs at an angle of , no power generation pulse is generated and no data is written to the nonvolatile memory 6.
  • the rotation speed detector 10 since the first magnetic pole part 2 and the second magnetic pole part 3 have an arc band shape, the inner and outer diameters of the first magnetic pole part 2 and the second magnetic pole part 3 are When lining up different product groups, it was necessary to create the first magnetic pole part 2 and the second magnetic pole part 3 for each product using a dedicated mold and magnetization device.
  • the rotation speed detector 10 according to the second embodiment changes the inner diameter and outer diameter of the first magnetic pole part 2 and the second magnetic pole part 3 by changing the installed number and installation position of the bar magnets 23 and 33. can be easily changed.
  • the rotation speed detector 10 according to the second embodiment is easier to create the first magnetic pole part 2 and the second magnetic pole part 3 than the rotation speed detector 10 according to the first embodiment, and has a low cost. Cost reduction can be realized.
  • the rotation speed detector 10 is provided with a gap 7 between the first magnetic pole part 2 and the second magnetic pole part 3 through which the base material 1 is exposed. It was explained as a form of However, the gap 7 may be provided in other configurations as long as it exhibits non-magnetic properties.
  • the base material 1 in the gap portion 7 shown in Embodiment 1 and Embodiment 2 is hollow, and the base material 1, the first magnetic pole portion 2, and the first magnetic pole portion 2 are hollow.
  • a gap portion 7 may be provided as a space in which neither of the two magnetic pole portions 3 is arranged. In this way, the rotation speed detector 10 can be configured so that the air existing in the space between the first magnetic pole part 2 and the second magnetic pole part 3 is used as the gap part 7.
  • a non-magnetic gap 7 can be provided between the two magnetic pole parts 3.
  • the first magnetic pole part 2 is arranged in the angular range from 0 degrees to 180 degrees in the base material 1, and the second magnetic pole part 2 is arranged in the angular range from 180 degrees to 360 degrees.
  • the magnetic pole part 3 is arranged, and the first magnetic pole part 2 and the second magnetic pole part are arranged in a certain angular range with the center of the circular arc of the inner and outer diameters of the first magnetic pole part 2 and the second magnetic pole part 3 as the center point.
  • the surface of the portion 3 may be covered with a material exhibiting non-magnetic properties.
  • Examples of angular ranges covered by materials exhibiting non-magnetic properties may include, but are not limited to, angular ranges between 350 degrees and 10 degrees and angular ranges between 170 degrees and 190 degrees.
  • the material exhibiting non-magnetic properties organic materials such as resins, non-metal inorganic materials such as ceramics, non-magnetic metal materials, composite materials thereof, etc. can be used.
  • non-magnetic metal materials include copper, brass, aluminum, etc., but are not limited to these materials.
  • the rotation speed detector 10 in which the non-magnetic gap portion 7 is provided between the first magnetic pole portion 2 and the second magnetic pole portion 3 can also be constructed by using the non-magnetic material shown above. be able to.
  • the configuration shown in the above embodiments shows an example of the content, and it is also possible to combine it with another known technology, or a part of the configuration can be omitted or changed without departing from the gist. It is also possible.

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PCT/JP2022/020409 2022-05-16 2022-05-16 回転数検出器 Ceased WO2023223389A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2022/020409 WO2023223389A1 (ja) 2022-05-16 2022-05-16 回転数検出器
CN202280070209.8A CN118119825B (zh) 2022-05-16 2022-05-16 转速检测器
US18/707,180 US12216138B2 (en) 2022-05-16 2022-05-16 Rotation speed detector
JP2022562859A JP7209911B1 (ja) 2022-05-16 2022-05-16 回転数検出器

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Application Number Priority Date Filing Date Title
PCT/JP2022/020409 WO2023223389A1 (ja) 2022-05-16 2022-05-16 回転数検出器

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WO2023223389A1 true WO2023223389A1 (ja) 2023-11-23

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