WO2013183724A1 - 角度センサ - Google Patents
角度センサ Download PDFInfo
- Publication number
- WO2013183724A1 WO2013183724A1 PCT/JP2013/065739 JP2013065739W WO2013183724A1 WO 2013183724 A1 WO2013183724 A1 WO 2013183724A1 JP 2013065739 W JP2013065739 W JP 2013065739W WO 2013183724 A1 WO2013183724 A1 WO 2013183724A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnet
- magnetic field
- angle
- external magnetic
- sensor
- Prior art date
Links
Images
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
-
- 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
- G01D5/14—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 the magnitude of a current or voltage
- G01D5/142—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 the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—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 the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
-
- 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
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
Definitions
- the present invention relates to an angle sensor.
- Patent Document 1 discloses a technique related to a magnetic angle sensor that can maintain high angle detection accuracy by preventing magnetic dust from entering a magnetic gap.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an angle sensor in which detection accuracy is less likely to be deteriorated or erroneously detected due to the influence of an external magnetic field. Yes.
- the present invention provides an angle sensor for detecting a rotation angle of an object, and a rotation of the magnet based on a magnet rotating according to the object and a change in a magnetic field generated from the magnet.
- An external magnetic field that is a magnetic field other than the magnet, and a direction of the magnetic field generated by the magnet in a rotation range in which the magnet rotates is set to be less than 90 degrees. It is characterized by being. According to such a configuration, it is possible to reduce the detection accuracy from being deteriorated due to the influence of the external magnetic field or the occurrence of erroneous detection.
- the external magnetic field has at least a magnetic field in one direction
- the rotation center angle of the magnet is set to be parallel to the external magnetic field
- the rotation of the magnet The angle is set to be within a range of less than plus or minus 90 degrees with respect to the rotation center angle.
- the external magnetic field has at least two orthogonal magnetic fields, and the rotation center angle of the magnet is 45 degrees with respect to each of the orthogonal external magnetic fields.
- the rotation angle of the magnet is set to be within a range of less than plus or minus 45 degrees with respect to the rotation center angle. According to such a configuration, when the external magnetic field is in two directions, it is possible to reliably reduce the detection accuracy or erroneous detection due to the influence of the external magnetic field.
- an angle sensor in which detection accuracy is less likely to be deteriorated due to the influence of an external magnetic field or erroneous detection occurs.
- FIG. 1 is a diagram illustrating a configuration example of an angle sensor according to a first embodiment of the present invention.
- 1A is a top view of the first embodiment
- FIG. 1B is a side view of FIG. 1A viewed from the X direction.
- the angle sensor 1 includes a substrate 10, a sensor IC (Integrated Circuit) 11, and a magnet 12.
- the substrate 10 is constituted by an insulating plate-like member such as glass epoxy or bakelite.
- a sensor IC 11 is provided on the front surface 10 a of the substrate 10.
- the back surface 10b is arrange
- the sensor IC 11 includes, for example, a plurality of Hall elements, and detects the direction of the magnetic field generated by the magnet 12 using these Hall elements. Since the magnet 12 rotates according to the object whose rotation angle is to be detected, the sensor IC 11 can detect the rotation angle of the object by detecting the direction of the magnetic field generated by the magnet 12.
- the magnet 12 is formed of, for example, a permanent magnet having an annular shape, and is rotatably supported around the center of the annular shape, and is locked to an object not shown. Thereby, the magnet 12 rotates in conjunction with the rotation of the object.
- the magnet 12 is disposed to face the magnet 12 with a predetermined distance G from the sensor IC 11. Further, the rotation center of the magnet 12 and the center position of the sensor IC 11 are arranged to coincide.
- the magnet 12 has a hatched portion (left half portion of the ring shown in FIG. 1) as an N pole, and a hatched portion as an S pole. .
- a shape of the magnet 12 it is also possible to use a cylindrical magnet instead of an annular shape. As indicated by the dashed arrow in the diagram of FIG. 1B, the magnetic field generated from the north pole of the magnet 12 passes through the sensor IC 11 and returns to the south pole.
- FIG. 2 is a diagram showing a state of an external magnetic field.
- the magnetic field of the magnet 12 is generated in the direction from the north pole to the south pole (direction from the left to the right in the figure).
- an external magnetic field generated from other than the magnet 12 (for example, a magnetic field generated by a member or a part disposed in the vicinity of the angle sensor 1) is shown in FIG. It is set to be in the direction toward. More specifically, when the position of a member or the like that generates an external magnetic field can be adjusted, the external magnetic field is set in the direction shown in FIG. 2 by adjusting the arrangement position of these members. . When the position of a member or the like that generates an external magnetic field cannot be adjusted, the positional relationship is set according to the mounting direction of the angle sensor 1.
- FIG. 2B is a diagram showing the relationship between the magnetic field generated at the rotation center angle of the magnet 12 and the external magnetic field.
- the rotation center angle is an average angle that is the center of the operation of the magnet 12 during the operation of the angle sensor 1, and the magnet 12 is rotated clockwise or counterclockwise around the rotation center angle.
- the angle sensor 1 when the angle sensor 1 is applied to a sensor that detects the opening degree of a throttle valve that adjusts the flow rate of air supplied to an automobile engine, the throttle valve is in a closed position when the engine is stopped, and the throttle valve is average when traveling. It opens and closes around the opening. Therefore, the angle at the average opening is set as the rotation center angle, and the magnetic field generated by the magnet 12 at the rotation center angle and the external magnetic field are set to be substantially parallel.
- 3 and 4 are diagrams showing the angle at which the magnet 12 rotates in accordance with the object.
- the maximum angle at which the magnet 12 rotates counterclockwise from the rotation center angle is ⁇ 1
- ⁇ 1 and ⁇ 2 are set so that ⁇ 1, ⁇ 2 ⁇ 90 degrees. That is, the direction of the magnetic field generated by the magnet 12 and the direction of the external magnetic field are set to be less than 90 degrees in the rotation range in which the magnet 12 rotates (range of ⁇ 1 to ⁇ 2). In addition, even if it may be rotated over 90 degree
- the direction of the magnetic field generated by the magnet 12 at the rotation center angle is set so that the direction of the external magnetic field is substantially parallel, and the rotation angle is within a range of less than plus or minus 90 degrees with respect to the center angle.
- the influence of the external magnetic field on the sensor IC 11 can be reduced. That is, as shown in FIG. 5, when the magnet 12 is schematically shown and the magnetic field from the north pole to the south pole of the magnet 12 is indicated by a solid arrow, the external line indicated by a broken arrow as shown in FIG.
- the direction of the magnetic field of the magnet 12 is not affected by the external magnetic field.
- FIG. 8 shows a Helmholtz coil in which a Helmholtz coil is arranged so as to sandwich the magnet 12 of the embodiment shown in FIG. 1, and the magnetic field generated from the Helmholtz coil and the magnetic field generated by the magnet 12 are set in parallel. Shows the output voltage (mV) of the sensor IC 11 when an AC voltage is applied.
- FIG. 9 shows the output voltage of the sensor IC 11 when the magnetic field generated from the Helmholtz coil and the magnetic field generated by the magnet 12 are set to be orthogonal to each other and an AC voltage is applied to the Helmholtz coil. From comparison of these figures, when the magnetic field generated from the Helmholtz coil and the magnetic field generated from the magnet 12 are parallel as shown in FIG.
- the output voltage of the sensor IC 11 does not vary regardless of the frequency.
- FIG. 9 when the magnetic field generated from the Helmholtz coil and the magnetic field generated from the magnet 12 are orthogonal to each other, particularly in the low frequency region (300 Hz or less) where the sensitivity of the sensor IC 11 is relatively high, The output voltage fluctuates. That is, when the external magnetic field generated from the Helmholtz coil and the magnetic field generated from the magnet 12 are parallel, it can be seen that the output voltage of the sensor IC 11 is hardly affected by the external magnetic field.
- the direction of the magnetic field of the magnet 12 at the rotation center angle and the direction of the external magnetic field are made substantially parallel to each other.
- the influence of the external magnetic field is reduced by setting the direction of the external magnetic field and the magnet 12, it is not necessary to add a new part. Can be prevented.
- a method of preventing an external magnetic field there is a method of arranging a member having a high magnetic permeability. Since such a member having a high magnetic permeability is heavy, such a member is placed at a position far from the sensor IC 11. When arranged, vibration resistance deteriorates. Moreover, a member with high magnetic permeability is generally expensive. For this reason, by omitting the use of a member having such a high magnetic permeability, it is possible to increase vibration resistance and reduce manufacturing costs.
- FIG. 10A is a diagram showing a configuration example of the second embodiment of the present invention.
- the number and direction of external magnetic fields are different from those in FIG. 1, but other configurations are the same as those in FIG.
- the directions of the two external magnetic fields indicated by the dashed arrows are substantially orthogonal, and the rotation center angle of the magnet 12 is 45 degrees with respect to these two magnetic fields. It is set to be an angle. That is, as shown in FIG. 10B, the two external magnetic fields are orthogonal to each other, and the external magnetic field and the rotation center angle of the magnet 12 are set to an angle of 45 degrees.
- the rotation angle of the magnet 12 is within a range of less than plus or minus 45 degrees from the rotation center angle. That is, in the second embodiment, ⁇ 1, ⁇ 2 ⁇ 45 degrees in FIGS. Thereby, in the rotation range in which the magnet 12 rotates, the direction of the magnetic field generated by the magnet 12 and the direction of the external magnetic field are set to be less than 90 degrees.
- the external magnetic field and the magnetic field at the rotation center angle of the magnet 12 are set to be 45 degrees, and the rotation angle of the magnet 12 is within a range of less than plus or minus 45 degrees from the center angle.
- the angle between the magnetic field of the magnet 12 and the external magnetic field can be less than 90 degrees even when the magnet 12 is rotated to the maximum, so that the influence of the external magnetic field can be minimized.
- times when the frequency is low, such a case can be made into consideration.
- the direction of the magnetic field at the rotation center angle of the magnet 12 and the direction of the two orthogonal magnetic fields are 45 degrees, and the rotation center angle of the magnet 12 is set.
- the influence of the external magnetic field is reduced by setting the directions of the two external magnetic fields and the magnet 12, so it is necessary to add parts. Therefore, it is possible to prevent an increase in cost and an increase in assembly man-hours.
- a method of preventing an external magnetic field there is a method of arranging a member having a high magnetic permeability. Since such a member having a high magnetic permeability is heavy, such a member is placed at a position far from the sensor IC 11. When arranged, vibration resistance deteriorates. Moreover, a member with high magnetic permeability is generally expensive. For this reason, by omitting the use of a member having such a high magnetic permeability, it is possible to increase vibration resistance and reduce manufacturing costs.
- the magnet 12 is rotated according to the object.
- the sensor IC 11 may be rotated according to the object.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
このような構成によれば、外部磁界の影響によって検出精度が低下したり、あるいは、誤検出が生じたりすることを少なくすることができる。
このような構成によれば、外部磁界が一方向である場合に、外部磁界の影響によって検出精度が低下したり、あるいは、誤検出が生じたりすることを確実に少なくすることができる。
このような構成によれば、外部磁界が二方向である場合に、外部磁界の影響によって検出精度が低下したり、あるいは、誤検出が生じたりすることを確実に少なくすることができる。
図1は本発明の第1実施形態に係る角度センサの構成例を示す図である。なお、図1(A)は第1実施形態の上面図であり、図1(B)は図1(A)をX方向から眺めた側面図である。図1に示すように第1実施形態では、角度センサ1は、基板10、センサIC(Integrated Circuit)11、および、マグネット12を有している。
図10(A)は本発明の第2実施形態の構成例を示す図である。なお、図10(A)では、図1と比較すると、外部磁界の数と、方向が異なっているが、それ以外の構成は図1と同様である。図10(A)に示す第2実施形態では、破線の矢印で示す2つの外部磁界の方向が略直交しており、また、マグネット12の回転中心角は、これら2つの磁界に対して45度の角度となるように設定されている。すなわち、図10(B)に示すように、2つの外部磁界は直交するとともに、外部磁界とマグネット12の回転中心角とは45度の角度になるように設定されている。また、第2実施形態では、マグネット12の回転角度は、回転中心角からプラスマイナス45度未満の範囲内とされる。すなわち、第2実施形態では、図3,4におけるθ1,θ2<45度とされる。これにより、マグネット12が回転する回転範囲において、マグネット12によって生じる磁界の方向と、外部磁界の方向とが90度未満となるように設定される。
以上の実施形態は一例であって、本発明が上述したような場合のみに限定されるものでないことはいうまでもない。例えば、以上の各実施形態では、円環状のマグネット12を用いるようにしたが、これ以外の形状であってもよい。例えば、円柱状のマグネットを使用したり、あるいは、多角柱形状のマグネットを使用したりすることも可能である。
10 基板
11 センサIC
12 マグネット
Claims (3)
- 対象物の回転角度を検出する角度センサにおいて、
前記対象物に応じて回転するマグネットと、
前記マグネットから生じる磁界の変化に基づいて、前記マグネットの回転角度を検出する磁気センサと、を有し、
前記マグネット以外の磁界である外部磁界の方向と、前記マグネットが回転する回転範囲において前記マグネットによって生じる磁界の方向とが90度未満となるように設定されていることを特徴とする角度センサ。 - 前記外部磁界は一方向の磁界を少なくとも有し、前記マグネットの回転中心角度を前記外部磁界と平行になるように設定するとともに、前記マグネットの回転角度が前記回転中心角度に対してプラスマイナス90度未満の範囲内となるように設定されていることを特徴とする請求項1に記載の角度センサ。
- 前記外部磁界は直交する二方向の磁界を少なくとも有し、前記マグネットの回転中心角度をこれら直交する外部磁界のそれぞれに対して45度になるように設定するとともに、前記マグネットの回転角度を前記回転中心角度に対してプラスマイナス45度未満の範囲内となるように設定されていることを特徴とする請求項1に記載の角度センサ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13801349.5A EP2860495A4 (en) | 2012-06-07 | 2013-06-06 | ANGLE SENSOR |
US14/405,596 US20150153202A1 (en) | 2012-06-07 | 2013-06-06 | Angular sensor |
IN2347MUN2014 IN2014MN02347A (ja) | 2012-06-07 | 2014-11-18 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-129972 | 2012-06-07 | ||
JP2012129972A JP2013253878A (ja) | 2012-06-07 | 2012-06-07 | 角度センサ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013183724A1 true WO2013183724A1 (ja) | 2013-12-12 |
Family
ID=49712111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/065739 WO2013183724A1 (ja) | 2012-06-07 | 2013-06-06 | 角度センサ |
Country Status (5)
Country | Link |
---|---|
US (1) | US20150153202A1 (ja) |
EP (1) | EP2860495A4 (ja) |
JP (1) | JP2013253878A (ja) |
IN (1) | IN2014MN02347A (ja) |
WO (1) | WO2013183724A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05126512A (ja) * | 1991-11-05 | 1993-05-21 | Fujitsu Ltd | 角度検出器 |
WO2007010842A1 (ja) * | 2005-07-20 | 2007-01-25 | Tomen Electronics Corporation | 回転角度検出装置 |
JP2009019926A (ja) | 2007-07-10 | 2009-01-29 | Tokyo Cosmos Electric Co Ltd | 磁気式角度センサ |
JP2009244044A (ja) * | 2008-03-31 | 2009-10-22 | Tokai Rika Co Ltd | 磁気式回転位置検出装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2527856B2 (ja) * | 1991-06-18 | 1996-08-28 | 三菱電機株式会社 | 磁気センサ |
JP4079043B2 (ja) * | 2003-06-13 | 2008-04-23 | 株式会社デンソー | 回転角度検出装置 |
JP4679358B2 (ja) * | 2005-02-03 | 2011-04-27 | 株式会社デンソー | 回転角度検出装置 |
WO2011001984A1 (ja) * | 2009-06-30 | 2011-01-06 | 株式会社トーメンエレクトロニクス | 回転角度検出装置 |
-
2012
- 2012-06-07 JP JP2012129972A patent/JP2013253878A/ja active Pending
-
2013
- 2013-06-06 EP EP13801349.5A patent/EP2860495A4/en not_active Withdrawn
- 2013-06-06 WO PCT/JP2013/065739 patent/WO2013183724A1/ja active Application Filing
- 2013-06-06 US US14/405,596 patent/US20150153202A1/en not_active Abandoned
-
2014
- 2014-11-18 IN IN2347MUN2014 patent/IN2014MN02347A/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05126512A (ja) * | 1991-11-05 | 1993-05-21 | Fujitsu Ltd | 角度検出器 |
WO2007010842A1 (ja) * | 2005-07-20 | 2007-01-25 | Tomen Electronics Corporation | 回転角度検出装置 |
JP2009019926A (ja) | 2007-07-10 | 2009-01-29 | Tokyo Cosmos Electric Co Ltd | 磁気式角度センサ |
JP2009244044A (ja) * | 2008-03-31 | 2009-10-22 | Tokai Rika Co Ltd | 磁気式回転位置検出装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2860495A4 |
Also Published As
Publication number | Publication date |
---|---|
JP2013253878A (ja) | 2013-12-19 |
IN2014MN02347A (ja) | 2015-08-14 |
EP2860495A4 (en) | 2016-05-25 |
US20150153202A1 (en) | 2015-06-04 |
EP2860495A1 (en) | 2015-04-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2002206913A (ja) | 非接触式回転位置センサ及び非接触式回転位置センサを有する絞弁組立体 | |
JP5128120B2 (ja) | 回転センサ | |
WO2010026948A1 (ja) | 角度センサ | |
JP4294036B2 (ja) | 回転角検出装置 | |
JP4204294B2 (ja) | 回転角検出装置 | |
JP4079043B2 (ja) | 回転角度検出装置 | |
JP2007263585A (ja) | 回転角度検出装置 | |
JP2004317486A (ja) | 回転角度検出装置 | |
JPWO2008050581A1 (ja) | 回転角度検出装置 | |
JP5855320B2 (ja) | 電動機 | |
JP2005140518A (ja) | 非接触式回転角度検出装置 | |
JP2006194684A (ja) | 回転角度検出装置 | |
JP4979487B2 (ja) | 角度センサ | |
WO2013183724A1 (ja) | 角度センサ | |
JP2009025317A (ja) | 回転角度検出装置 | |
US9880024B2 (en) | Measurement device for determining angular position | |
US10554108B2 (en) | Resolver stator having multilayered core | |
JP2003139560A (ja) | 回転位置検出装置 | |
CN113632341A (zh) | 马达 | |
JP6334228B2 (ja) | 磁性体検知器 | |
JP5359970B2 (ja) | 回転角検出装置 | |
WO2019216179A1 (ja) | 回転検出装置 | |
US9605977B2 (en) | Rotation position detection device | |
JP2006038872A (ja) | 非接触式回転位置センサを有する絞弁組立体 | |
JP2013120118A (ja) | 傾斜センサ及び車載の傾斜検出装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13801349 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14405596 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2013801349 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013801349 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201500076 Country of ref document: ID |