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WO2018198235A1 - Actionneur rotatif et actionneur vg - Google Patents

Actionneur rotatif et actionneur vg Download PDF

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Publication number
WO2018198235A1
WO2018198235A1 PCT/JP2017/016577 JP2017016577W WO2018198235A1 WO 2018198235 A1 WO2018198235 A1 WO 2018198235A1 JP 2017016577 W JP2017016577 W JP 2017016577W WO 2018198235 A1 WO2018198235 A1 WO 2018198235A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet
hole
sensor
rotary actuator
shaft
Prior art date
Application number
PCT/JP2017/016577
Other languages
English (en)
Japanese (ja)
Inventor
修榮 邉
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/016577 priority Critical patent/WO2018198235A1/fr
Priority to JP2019514955A priority patent/JP6690865B2/ja
Publication of WO2018198235A1 publication Critical patent/WO2018198235A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a rotary actuator and a VG (Variable Geometry) actuator using the rotary actuator.
  • VG turbocharger for automobiles
  • an actuator for controlling the opening degree of the nozzle vane in the VG turbocharger that is, a so-called “VG actuator”
  • VG actuator an electrically controlled rotary actuator is used.
  • the VG actuator is provided with a mechanism for detecting the rotation angle of the shaft using a magnet and a sensor. That is, the magnet is provided at one end of the shaft and is rotatable together with the shaft. The sensor is disposed opposite to the magnet via a so-called “air gap”. The sensor detects the rotation angle of the shaft by detecting the magnetic field generated by the magnet (see, for example, Patent Document 1).
  • the range of the value of magnetic flux density that can be detected by the sensor (hereinafter referred to as “detectable range”) is set to a predetermined range according to the specification of the sensor. For this reason, in the mechanism for detecting the rotation angle of the shaft, it is required that the value of the magnetic flux density at the sensor position be within the detectable range. However, since the magnetic flux density at the position of the sensor varies due to the following factors, it is difficult to keep the value of the magnetic flux density within the detectable range.
  • the VG actuator is composed of a plurality of parts, and the design dimension of each part is given a margin from the viewpoint of absorbing the dimensional variation of each part. For this reason, the VG actuator has a backlash between components, and the width of the air gap varies due to this backlash.
  • the magnetic flux density at the sensor position increases in a quadratic function as the width of the air gap decreases.
  • the magnetic flux density of the magnetic field generated by the magnet varies according to the environmental temperature. For this reason, the magnetic flux density at the position of the sensor also varies according to the environmental temperature. Therefore, even if the variation amount of the width of the air gap is reduced by increasing the dimensional accuracy of each part, it is difficult to keep the value of the magnetic flux density at the sensor position within the detectable range.
  • the present invention has been made to solve the above-described problems, and provides a rotary actuator and a VG actuator that can easily keep the value of the magnetic flux density at the sensor position within the detectable range. Objective.
  • the rotary actuator according to the present invention is provided at one end of the shaft, and is disposed so as to face the magnet through an air gap and a magnet that can rotate integrally with the shaft, and detects a magnetic field generated by the magnet.
  • a sensor for detecting the rotation angle of the shaft, and the magnet is composed of a first half corresponding to the N pole and a second half corresponding to the S pole, and the first half
  • a hole or a magnetic shield body is provided between the second halves, and the sensor detects a magnetic field straddling the hole or the magnetic shield body.
  • FIG. 3 is a sectional view taken along line A-A ′ shown in FIG. 2. It is explanatory drawing which shows distribution of the magnetic flux density by the magnetic field produced between the center part of the 1st half part, and the center part of the 2nd half part when the magnet which does not have a hole part is used. It is explanatory drawing which shows distribution of the magnetic flux density by the magnetic field produced between the center part of the 1st half part, and the center part of the 2nd half part when the magnet which has a hole part is used.
  • FIG. 9 is a cross-sectional view taken along line A-A ′ shown in FIG. 8. It is a top view of the other magnet which concerns on Embodiment 1 of this invention.
  • FIG. 13 is a sectional view taken along line A-A ′ shown in FIG. 12.
  • FIG. 1 is an explanatory diagram showing a main part of the rotary actuator according to the first embodiment of the present invention.
  • FIG. 2 is a plan view of the magnet according to Embodiment 1 of the present invention.
  • 3 is a cross-sectional view taken along line AA ′ shown in FIG.
  • the rotary actuator 100 according to the first embodiment will be described focusing on an example applied to an in-vehicle VG actuator.
  • 1 is a gear.
  • the gear 1 is rotated by driving a motor (not shown).
  • a substantially rod-shaped shaft 2 is provided along the rotation axis A1. That is, the gear 1 is provided at one end of the shaft 2, and the output lever 3 is provided at the other end of the shaft 2.
  • the shaft 2 rotates integrally with the gear 1 (see arrow A2 shown in FIG. 1), and the output lever 3 is rotated when the shaft 2 rotates.
  • the rotation of the output lever 3 changes the opening degree of the nozzle vane provided in the VG turbocharger (not shown).
  • a substantially disk-shaped magnet 4 is provided at one end of the shaft 2.
  • the magnet 4 is rotatable integrally with the shaft 2 and has a substantially semi-disc-shaped portion corresponding to the N pole (hereinafter referred to as “first half”) 4N and a substantially semi-disc-shaped portion corresponding to the S pole (hereinafter referred to as “first half”). It is referred to as “second half”.) 4S.
  • a hole 42 is provided between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S. That is, the hole 42 is disposed at the center of the magnet 4 and is disposed on the rotation axis A1. As shown in FIGS. 2 and 3, the hole 42 is configured by a substantially cylindrical through hole along the rotation axis A ⁇ b> 1.
  • 5 is a sensor.
  • the sensor 5 is mounted on the electronic circuit board 6 and is disposed so as to face the magnet 4 through the air gap 7.
  • the sensor 5 detects the rotation angle of the shaft 2 by detecting the component in the direction along the detection surface 51 (see arrow A3 shown in FIG. 1) of the magnetic field generated by the magnet 4. That is, the sensor 5 is composed of a rotation angle sensor using a magnetic sensor.
  • the senor 5 is disposed on the rotation axis A1.
  • the sensor 5 detects at least a magnetic field generated between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S, that is, a magnetic field straddling the hole 42.
  • Components such as the gear 1, the shaft 2, the magnet 4, the sensor 5, and the electronic circuit board 6 are accommodated in a housing (not shown).
  • the member 8 formed by integrally assembling components such as the gear 1, the shaft 2, the output lever 3, and the magnet 4 has a backlash in the direction along the rotation axis A1 with respect to the housing. This backlash occurs because the design dimensions of each of these parts are provided with an allowance from the viewpoint of absorbing the dimensional variations of these parts.
  • the width W of the air gap 7 varies due to the backlash of the member 8 with respect to the housing.
  • the main part of the rotary actuator 100 is configured.
  • FIG. 4 shows a distribution of magnetic flux density due to a magnetic field generated between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S when the magnet 4 having no hole 42 is used. It is explanatory drawing which shows.
  • FIG. 5 shows the magnetic field generated between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S, that is, straddles the hole 42 when the magnet 4 having the hole 42 is used. It is explanatory drawing which shows distribution of the magnetic flux density by a magnetic field.
  • the thickness of the broken line and the shade of color represent the magnitude of the magnetic flux density. As shown in FIGS. 4 and 5, by using the magnet 4 having the hole 42, the magnetic flux density in the vicinity of the center of the magnet 4 is larger than when the magnet 4 having no hole 42 is used. The thickness can be reduced.
  • FIG. 6 shows a case where the magnet 4 that does not have the hole 42 is used and the width W of the air gap 7 between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S. It is a characteristic view which shows magnetic flux density B in the position of the sensor 5 by the generated magnetic field.
  • FIG. 7 shows a case where the magnet 4 having the hole 42 is used and is formed between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S with respect to the width W of the air gap 7. It is a characteristic view which shows magnetic flux density B in the position of the sensor 5 by the magnetic field, ie, the magnetic field straddling the hole part.
  • ⁇ W indicates a range in which the width W varies due to rattling of the member 8
  • ⁇ B indicates a range of values of the magnetic flux density B that can be detected by the sensor 5, that is, a detectable range.
  • A4 indicates a region of ⁇ W ⁇ ⁇ B. I indicates a characteristic line when the environmental temperature is approximately ⁇ 40 ° C., II indicates a characteristic line when the environmental temperature is approximately 150 ° C., and III indicates that the environmental temperature is approximately 25 ° C. The characteristic line at a certain time is shown.
  • the sensor 5 can normally detect the rotation angle of the shaft 2 in a temperature environment of approximately ⁇ 40 ° C. In a range where the characteristic line II is included in the region A4, the sensor 5 can normally detect the rotation angle of the shaft 2 in a temperature environment of about 150 ° C. In a range where the characteristic line III is included in the region A4, the sensor 5 can normally detect the rotation angle of the shaft 2 in a temperature environment of approximately 25 ° C.
  • the magnitude of the magnetic flux density in the vicinity of the central portion of the magnet 4 increases (see FIG. 4).
  • the width W of the air gap 7 is small, the magnetic flux density B at the position of the sensor 5 becomes a value larger than the upper limit value of the detectable range ⁇ B (see region A5 shown in FIG. 6).
  • the characteristic lines I to III deviate from the region A4, and the sensor 5 cannot normally detect the rotation angle of the shaft 2.
  • the magnetic flux density B is greater than the upper limit value of the detectable range ⁇ B when the width W of the air gap 7 is less than approximately 1.9 millimeters (mm). Is also a large value.
  • the magnetic flux density B is larger than the upper limit value of the detectable range ⁇ B when the width W of the air gap 7 is less than about 1.2 mm.
  • the magnetic flux density B is larger than the upper limit value of the detectable range ⁇ B when the width W of the air gap 7 is less than approximately 1.7 mm.
  • the magnetic flux density in the vicinity of the center of the magnet 4 can be reduced (see FIG. 5).
  • decrease of the width W can be made loose (refer FIG.6 and FIG.7).
  • the value of the magnetic flux density B at the position of the sensor 5 can be within the detectable range ⁇ B (see FIG. 7).
  • the magnet 4 having the hole 42 it is easy to fit the value of the magnetic flux density B at the position of the sensor 5 within the detectable range ⁇ B. Further, since it is not necessary to increase the dimensional accuracy of each component, it is possible to prevent an increase in the unit price of each component, and it is possible to prevent an increase in the unit price of the rotary actuator 100. Furthermore, since the sensor 5 can detect the rotation angle of the shaft 2 even if the width W of the air gap 7 is reduced, the rotary actuator 100 can be downsized.
  • the shape of the hole 42 is not limited to the through hole shown in FIGS.
  • the hole part 42 should just be formed in the opposing surface part with respect to the sensor 5 in the magnet 4 at least.
  • the hole 42 may be constituted by a substantially hemispherical recess formed in the surface of the magnet 4 facing the sensor 5.
  • size of the magnetic flux density in the vicinity of the center part of the magnet 4 can be made small like the example shown in FIG. As a result, the same effect as that obtained when the magnet 4 is provided with a through hole can be obtained.
  • the hole 42 has a substantially hemispherical concave portion (hereinafter referred to as “first concave portion”) 42 a formed on the surface of the magnet 4 facing the sensor 5, and the opposing portion. It may be constituted by a substantially hemispherical concave portion (hereinafter referred to as “second concave portion”) 42 b formed on the back surface portion with respect to the surface portion.
  • first concave portion substantially hemispherical concave portion
  • second concave portion substantially hemispherical concave portion
  • the magnet 4 may be provided with a magnetic shield body using a magnetic shield material instead of the hole 42.
  • a substantially disk-shaped magnetic shield body 43 may be disposed on the surface of the magnet 4 facing the sensor 5.
  • the use of the rotary actuator 100 is not limited to the VG actuator, and is not limited to the on-vehicle actuator.
  • the environmental temperature fluctuates greatly, and the member 8 is likely to be loose due to vibration.
  • the magnetic flux density B at the position of the sensor 5 is likely to fluctuate, which is suitable for using the rotary actuator 100 of the first embodiment.
  • the rotary actuator 100 is provided at one end of the shaft 2, and is disposed so as to face the magnet 4 via the magnet 4 that can rotate integrally with the shaft 2 and the air gap 7.
  • a sensor 5 that detects the rotation angle of the shaft 2 by detecting the magnetic field generated by the magnet 4, and the magnet 4 corresponds to the first half 4N corresponding to the N pole and the S pole.
  • the hole portion 42 or the magnetic shield body 43 is provided between the first half portion 4N and the second half portion 4S, and the sensor 5 includes the hole portion 42 or the magnetic portion. A magnetic field straddling the shield body 43 is detected.
  • the value of the magnetic flux density B at the position of the sensor 5 can be within the detectable range ⁇ B regardless of the width W of the air gap 7 and the environmental temperature. As a result, it becomes easy to keep the value of the magnetic flux density B at the position of the sensor 5 within the detectable range ⁇ B.
  • the hole 42 or the magnetic shield body 43 is provided between the central portion 41N of the first half 4N and the central portion 41S of the second half 4S, and the sensor 5 is connected to the first half 4N. A magnetic field generated between the central portion 41N and the central portion 41S of the second half 4S is detected. Accordingly, the rotary actuator 100 can be realized using the magnet 4 illustrated in FIGS. 2 and 3, 8 and 9, 10 and 11, or 12 and 13.
  • the hole part 42 is provided in the magnet 4, and the hole part 42 is comprised by the through-hole.
  • the rotary actuator 100 is realizable using the magnet 4 illustrated in FIG.2 and FIG.3.
  • the hole part 42 is provided in the magnet 4,
  • the hole part 42 is comprised by the recessed part formed in the opposing surface part with respect to the sensor 5 in the magnet 4.
  • the rotary actuator 100 can be realized using the magnet 4 illustrated in FIGS. 8 and 9.
  • the hole part 42 is provided in the magnet 4,
  • the hole part 42 is the 1st recessed part 42a formed in the opposing surface part with respect to the sensor 5 in the magnet 4, and the 2nd recessed part formed in the back surface part with respect to the said opposing surface part. 42b. Accordingly, the rotary actuator 100 can be realized using the magnet 4 illustrated in FIGS. 10 and 11.
  • the magnet 4 is provided with a magnetic shield body 43, and the magnetic shield body 43 is disposed on the surface of the magnet 4 facing the sensor 5. Accordingly, the rotary actuator 100 can be realized using the magnet 4 illustrated in FIGS. 12 and 13.
  • any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.
  • the rotary actuator of the present invention can be used for, for example, an in-vehicle VG actuator.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

La présente invention concerne un actionneur rotatif (100) qui comprend : un aimant (4) qui est disposé au niveau d'une partie d'extrémité d'un arbre (2) et qui peut tourner conjointement avec l'arbre (2) ; et un capteur (5) qui est disposé de façon à faire face à l'aimant (4) avec un entrefer (7) entre ceux-ci et qui détecte un angle de rotation de l'arbre (2) par détection d'un champ magnétique généré par l'aimant (4). L'aimant (4) est constitué d'une première demi-section (4N) correspondant au pôle N et d'une deuxième demi-section (4S) correspondant au pôle S. En outre, un trou (42) ou un corps de blindage magnétique (43) est disposé entre la première demi-section (4N) et la deuxième demi-section (4S). Le capteur (5) détecte un champ magnétique couvrant le trou (42) ou le corps de blindage magnétique (43).
PCT/JP2017/016577 2017-04-26 2017-04-26 Actionneur rotatif et actionneur vg WO2018198235A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2017/016577 WO2018198235A1 (fr) 2017-04-26 2017-04-26 Actionneur rotatif et actionneur vg
JP2019514955A JP6690865B2 (ja) 2017-04-26 2017-04-26 回転式アクチュエータ及びｖｇアクチュエータ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/016577 WO2018198235A1 (fr) 2017-04-26 2017-04-26 Actionneur rotatif et actionneur vg

Publications (1)

Publication Number Publication Date
WO2018198235A1 true WO2018198235A1 (fr) 2018-11-01

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PCT/JP2017/016577 WO2018198235A1 (fr) 2017-04-26 2017-04-26 Actionneur rotatif et actionneur vg

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WO (1) WO2018198235A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023109265A (ja) * 2022-01-27 2023-08-08 三菱電機株式会社 回転角度検出装置及びそれを用いた回転電機

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006208048A (ja) * 2005-01-25 2006-08-10 Denso Corp 回転角検出装置
WO2009116241A1 (fr) * 2008-03-18 2009-09-24 三菱電機株式会社 Appareil de détection d'angle de rotation
JP2012145425A (ja) * 2011-01-12 2012-08-02 Tdk Corp 回転角度センサ
JP2017090073A (ja) * 2015-11-04 2017-05-25 三菱電機株式会社 非接触式回転角度検出装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006208048A (ja) * 2005-01-25 2006-08-10 Denso Corp 回転角検出装置
WO2009116241A1 (fr) * 2008-03-18 2009-09-24 三菱電機株式会社 Appareil de détection d'angle de rotation
JP2012145425A (ja) * 2011-01-12 2012-08-02 Tdk Corp 回転角度センサ
JP2017090073A (ja) * 2015-11-04 2017-05-25 三菱電機株式会社 非接触式回転角度検出装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023109265A (ja) * 2022-01-27 2023-08-08 三菱電機株式会社 回転角度検出装置及びそれを用いた回転電機

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Publication number Publication date
JP6690865B2 (ja) 2020-04-28
JPWO2018198235A1 (ja) 2019-11-07

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