JP2013002993A - Gmr sensor - Google Patents
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- JP2013002993A JP2013002993A JP2011135122A JP2011135122A JP2013002993A JP 2013002993 A JP2013002993 A JP 2013002993A JP 2011135122 A JP2011135122 A JP 2011135122A JP 2011135122 A JP2011135122 A JP 2011135122A JP 2013002993 A JP2013002993 A JP 2013002993A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/64—Electric machine technologies in electromobility
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Abstract
Description
本発明は、回転体と同軸で回転する磁石回転子で生成された回転磁界の変化による磁気抵抗の変動を検出して、回転体の回転速度や回転角などを検出するＧＭＲ（Ｇｉａｎｔ Ｍａｇｎｅｔｏ−Ｒｅｓｉｓｔｉｖｅ：巨大磁気抵抗）センサに関するものである。 The present invention detects a change in magnetic resistance due to a change in a rotating magnetic field generated by a magnet rotor that rotates coaxially with a rotating body, and detects a rotational speed, a rotation angle, and the like of the rotating body. GMR (Giant Magneto-Resitive) : Giant magnetoresistive) sensor.
従来より、例えば、モータの回転角を検出するための回転センサとして、モータロータなどの回転体と同軸で回転する励磁コイルと、モータステータなどの固定体に取り付けられると共に回転体の回転軸周りに配置された複数の検出コイルと、からなり、回転角に対して振幅が変化する複数相の出力信号から回転角を検出するレゾルバがある（例えば、特許文献１）。 Conventionally, for example, as a rotation sensor for detecting the rotation angle of a motor, an excitation coil that rotates coaxially with a rotating body such as a motor rotor and a fixed body such as a motor stator are mounted around a rotating shaft of the rotating body. There is a resolver that detects a rotation angle from a plurality of phase output signals whose amplitude changes with respect to the rotation angle (for example, Patent Document 1).
ところで、近年、著しい進歩を遂げている、例えば、ハイブリッド車、電気自動車などのエコカーにおいては、省エネ性能を向上させるべく、全ての電装部品に対して軽量化が要求されている。しかし、前述したレゾルバは、その重量が３００ｇ程度以上であり、軽量化には不向きであった。 By the way, in recent years, for example, in an eco car such as a hybrid vehicle and an electric vehicle that has made remarkable progress, weight reduction is required for all electrical components in order to improve energy saving performance. However, the resolver described above has a weight of about 300 g or more and is not suitable for weight reduction.
そこで、軽量化の要求に鑑み、その重量が１００ｇ程度以下と前述したレゾルバよりも軽量なＧＭＲセンサを、モータの回転角を検出するために用いようとする試みがなされている（例えば、特許文献２）。 Therefore, in view of the demand for weight reduction, attempts have been made to use a GMR sensor having a weight of about 100 g or less and lighter than the resolver described above to detect the rotation angle of the motor (for example, Patent Documents). 2).
ＧＭＲセンサは、ＧＭＲ素子を用いた回転センサであり、磁石回転子で生成された回転磁界の変化で磁気抵抗が変動する磁気抵抗効果を利用して回転角や回転速度を検出するものである。 The GMR sensor is a rotation sensor using a GMR element, and detects a rotation angle and a rotation speed using a magnetoresistive effect in which the magnetoresistance varies due to a change in a rotating magnetic field generated by a magnet rotor.
また、更に最近では、電装部品は、軽量化のみならず、小型化も要求されている。この小型化の要求に鑑み、磁気検出素子、磁気検出素子が搭載されたセンサ基板、及び信号処理基板を樹脂モールドにより一体化（アッセンブリ）した磁気センサ（例えば、特許文献３）も盛んに開発されている。 Furthermore, recently, electrical components are required not only to be lightweight but also to be miniaturized. In view of this demand for miniaturization, a magnetic sensor (for example, Patent Document 3) in which a magnetic detection element, a sensor substrate on which the magnetic detection element is mounted, and a signal processing substrate are integrated (assembled) by a resin mold has been actively developed. ing.
しかしながら、ＧＭＲセンサを高温環境下に曝される車両の機器（モータ）の測定に用いると、高温環境の温度によっては信号処理基板が損傷してしまう場合があった。 However, when the GMR sensor is used to measure a vehicle device (motor) exposed to a high temperature environment, the signal processing board may be damaged depending on the temperature of the high temperature environment.
また、小型化を目的として、単に、ＧＭＲ素子、ＧＭＲ素子が搭載されたセンサ基板、及び信号処理基板を一体化しようとすると、センサ基板と信号処理基板とを接続する信号接続線と、磁石回転子と、が非常に近接する場合がある。これに伴い、信号接続線に渦電流が発生してしまい、正確な回転角や回転速度を得ることができない虞があった。 Further, for the purpose of miniaturization, if an attempt is made to simply integrate a GMR element, a sensor board on which the GMR element is mounted, and a signal processing board, a signal connection line for connecting the sensor board and the signal processing board, and magnet rotation The child may be very close. As a result, an eddy current is generated in the signal connection line, and there is a possibility that an accurate rotation angle and rotation speed cannot be obtained.
本発明は、このような事情に鑑みなされたものであり、軽量、小型でありながらも、高温環境下にある機器の測定に用いたとしても信号処理基板の損傷を低減することが可能であり、且つ渦電流の影響を低減することが可能なＧＭＲセンサの提供を目的とする。 The present invention has been made in view of such circumstances, and it is possible to reduce damage to a signal processing board even when used for measurement of equipment in a high-temperature environment while being lightweight and small. An object of the present invention is to provide a GMR sensor capable of reducing the influence of eddy currents.
この目的を達成するために創案された本発明は、回転磁界を生成する磁石回転子と、前記磁石回転子で生成された回転磁界の変化による磁気抵抗の変動を検出すると共に検出信号を出力するＧＭＲ素子が搭載されたセンサ基板と、前記ＧＭＲ素子から出力された検出信号を処理する信号処理基板と、前記センサ基板と前記信号処理基板とを接続する信号接続線と、を備え、前記センサ基板、前記信号処理基板、及び前記信号接続線は、同一の樹脂筐体内に収納されると共に、前記磁石回転子は、機器の収納ケース内に収納されるＧＭＲセンサであって、前記樹脂筐体は、前記収納ケースを貫通し、且つ一端側が前記磁石回転子の外周面に隣接しており、前記センサ基板は、前記収納ケース内に位置する前記樹脂筐体の一端側に配置され、前記信号処理基板は、前記収納ケース外に位置する前記樹脂筐体の他端側に配置され、前記収納ケース内に位置する前記信号接続線は、前記ＧＭＲ素子を挟んで前記磁石回転子と反対側に位置するように配線されることを特徴とするＧＭＲセンサである。 The present invention, which was created to achieve this object, detects a magnetic rotor that generates a rotating magnetic field, a change in magnetoresistance due to a change in the rotating magnetic field generated by the magnet rotor, and outputs a detection signal. A sensor board on which a GMR element is mounted; a signal processing board that processes a detection signal output from the GMR element; and a signal connection line that connects the sensor board and the signal processing board. The signal processing board and the signal connection line are housed in the same resin housing, and the magnet rotor is a GMR sensor housed in a device housing case, , Penetrating the storage case, and one end side is adjacent to the outer peripheral surface of the magnet rotor, the sensor substrate is disposed on one end side of the resin casing located in the storage case, The signal processing board is disposed on the other end side of the resin casing located outside the storage case, and the signal connection line positioned inside the storage case is opposite to the magnet rotor across the GMR element It is wired so that it may be located in GMR sensor characterized by the above-mentioned.
前記樹脂筐体は、前記収納ケース内外にわたって前記磁石回転子の回転軸と平行な方向に伸びる中空部が形成され、前記中空部には、前記センサ基板、前記信号処理基板、及び前記信号接続線が収納されると良い。 The resin casing is formed with a hollow portion extending in a direction parallel to the rotation axis of the magnet rotor over the inside and outside of the storage case. The hollow portion includes the sensor substrate, the signal processing substrate, and the signal connection line. Should be stored.
前記中空部を区画形成する壁部のうち、前記磁石回転子の外周面に隣接する位置の壁部が他の壁部に比べて薄く形成されており、前記ＧＭＲ素子と前記磁石回転子との距離が短くされると良い。 Of the wall portions defining the hollow portion, a wall portion adjacent to the outer peripheral surface of the magnet rotor is formed thinner than other wall portions, and the GMR element and the magnet rotor The distance should be shortened.
前記中空部は、前記センサ基板、前記信号処理基板、及び前記信号接続線が収納された後ポッティングされ、前記樹脂筐体に対する前記センサ基板、前記信号処理基板、及び前記信号接続線の位置関係が固定されると良い。 The hollow portion is potted after the sensor substrate, the signal processing substrate, and the signal connection line are accommodated, and the positional relationship of the sensor substrate, the signal processing substrate, and the signal connection line with respect to the resin casing is determined. It should be fixed.
前記信号接続線は、前記収納ケース外に位置する一端がクランク状に形成されていると良い。 The signal connection line is preferably formed in a crank shape at one end located outside the storage case.
本発明によれば、軽量、小型でありながらも、高温環境下にある機器の測定に用いたとしても信号処理基板の損傷を低減することが可能であり、且つ渦電流の影響を低減することが可能である。 According to the present invention, it is possible to reduce damage to a signal processing board even when used for measuring a device in a high-temperature environment while being lightweight and small, and to reduce the influence of eddy currents. Is possible.
以下、本発明の好適な実施の形態を添付図面にしたがって説明する。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
図１は、本発明の好適な実施の形態に係るＧＭＲセンサを示す断面図である。 FIG. 1 is a cross-sectional view showing a GMR sensor according to a preferred embodiment of the present invention.
図１に示すように、本実施の形態に係るＧＭＲセンサ１０は、回転磁界を生成する磁石回転子１２と、磁石回転子１２で生成された回転磁界の変化による磁気抵抗の変動を検出すると共に検出信号を出力するＧＭＲ素子１３が搭載されたセンサ基板１４と、ＧＭＲ素子１３から出力された検出信号を処理する信号処理基板１５と、センサ基板１４と信号処理基板１５とを接続する信号接続線１６と、を備え、センサ基板１４、信号処理基板１５、及び信号接続線１６は、同一の樹脂筐体１７内に収納されると共に、磁石回転子１２は、機器の収納ケースとしてのモータケース１９内に収納されたものである。本発明において、樹脂筐体１７は、モータケース１９を貫通し、且つ一端側が磁石回転子１２の外周面に隣接しており、センサ基板１４は、モータケース１９内に位置する樹脂筐体１７の一端側に配置され、信号処理基板１５は、モータケース１９外に位置する樹脂筐体１７の他端側に配置され、モータケース１９内に位置する信号接続線１６は、ＧＭＲ素子１３を挟んで磁石回転子１２と反対側に位置するように配線されることを特徴としている。 As shown in FIG. 1, the GMR sensor 10 according to the present embodiment detects a magnetic rotor 12 that generates a rotating magnetic field, and a change in magnetoresistance due to a change in the rotating magnetic field generated by the magnet rotor 12. A sensor substrate 14 on which a GMR element 13 that outputs a detection signal is mounted, a signal processing substrate 15 that processes the detection signal output from the GMR element 13, and a signal connection line that connects the sensor substrate 14 and the signal processing substrate 15. 16, the sensor substrate 14, the signal processing substrate 15, and the signal connection line 16 are accommodated in the same resin casing 17, and the magnet rotor 12 is a motor case 19 as a device storage case. It is stored inside. In the present invention, the resin casing 17 penetrates the motor case 19, and one end side is adjacent to the outer peripheral surface of the magnet rotor 12, and the sensor substrate 14 is the resin casing 17 positioned in the motor case 19. The signal processing board 15 is arranged on one end side, the signal processing board 15 is arranged on the other end side of the resin casing 17 located outside the motor case 19, and the signal connection line 16 located in the motor case 19 sandwiches the GMR element 13. It is wired so that it may be located on the opposite side to the magnet rotor 12.
以下に、一例として、本実施の形態に係るＧＭＲセンサ１０をモータのモータロータの回転角を検出するために用いた例を説明する。 As an example, an example in which the GMR sensor 10 according to the present embodiment is used to detect the rotation angle of a motor rotor of a motor will be described below.
モータ１８は、回転軸Ｘ上に配置されるモータシャフト２４と、モータシャフト２４に取り付けられたモータロータ１１と、モータロータ１１の外周側に配置されたモータステータ２５と、これらを収納するモータケース１９と、を有する。 The motor 18 includes a motor shaft 24 disposed on the rotation axis X, a motor rotor 11 attached to the motor shaft 24, a motor stator 25 disposed on the outer peripheral side of the motor rotor 11, and a motor case 19 for housing them. Have.
磁石回転子１２は、その外周に沿ってＮ極とＳ極とが交互に配置されたリング状に形成されると共に、モータロータ１１の回転軸Ｘを構成するモータシャフト２４に一体的に固定される。この磁石回転子１２は、モータロータ１１の回転に伴ってモータシャフト２４と一体に回転し、その放射方向に回転磁界を生成する。 The magnet rotor 12 is formed in a ring shape in which N poles and S poles are alternately arranged along the outer periphery thereof, and is integrally fixed to a motor shaft 24 that constitutes the rotation axis X of the motor rotor 11. . The magnet rotor 12 rotates integrally with the motor shaft 24 as the motor rotor 11 rotates, and generates a rotating magnetic field in the radial direction.
ＧＭＲ素子１３は、磁石回転子１２で生成された回転磁界の変化に応じて抵抗が変動する磁気抵抗効果を利用して正弦波状に振幅が変化する検出信号を出力するものである。 The GMR element 13 outputs a detection signal whose amplitude changes sinusoidally using a magnetoresistive effect in which the resistance varies according to the change in the rotating magnetic field generated by the magnet rotor 12.
信号処理基板１５は、ＧＭＲ素子１３から出力された検出信号を処理する信号処理回路を有している。本実施の形態においては、信号処理基板１５は、ＧＭＲ素子１３から出力された検出信号の増幅を行ったり、検出信号に基づき演算を行ったり、又はその両方を行い、図示しないＣＰＵ又は専用ＩＣへ処理信号を出力する。そして、ＣＰＵ又は専用ＩＣは、当該処理信号に基づき、磁石回転子１２の回転角や回転速度を計算する。なお、本実施の形態において、信号処理基板１５は、ＧＭＲ素子１３から出力された検出信号を処理し、ＣＰＵ又は専用ＩＣに処理信号を出力するのみとしたが、信号処理基板１５自体に回転角や回転速度を計算する機能を持たせることも可能である。 The signal processing board 15 has a signal processing circuit that processes the detection signal output from the GMR element 13. In the present embodiment, the signal processing board 15 amplifies the detection signal output from the GMR element 13, performs an operation based on the detection signal, or both, to a CPU or dedicated IC (not shown). Output processing signal. Then, the CPU or the dedicated IC calculates the rotation angle and rotation speed of the magnet rotor 12 based on the processing signal. In the present embodiment, the signal processing board 15 only processes the detection signal output from the GMR element 13 and outputs the processing signal to the CPU or dedicated IC. However, the signal processing board 15 itself has a rotation angle. It is also possible to have a function to calculate the rotation speed.
信号接続線１６は、ＧＭＲ素子１３が搭載されたセンサ基板１４と信号処理基板１５との間で検出信号などの伝送を行うためのものであり、例えば、銅や銅合金などの金属からなる。 The signal connection line 16 is used to transmit a detection signal and the like between the sensor substrate 14 on which the GMR element 13 is mounted and the signal processing substrate 15, and is made of a metal such as copper or a copper alloy, for example.
樹脂筐体１７は、モータケース１９に形成された貫通孔２６に挿入されると共にその貫通孔２６にＯリング２７を介して取り付けられる。樹脂筐体１７の内部には中空部２２が形成されている。中空部２２は、樹脂筐体１７の内部におけるモータケース１９内外にわたって磁石回転子１２の回転軸Ｘと平行な方向に伸びる。中空部２２は、樹脂製の端子ブロック２８が収納されるとともに、端子ブロック２８ごとポッティングされ、樹脂筐体１７に対するセンサ基板１４、信号処理基板１５、及び信号接続線１６の位置関係が固定される。 The resin casing 17 is inserted into a through hole 26 formed in the motor case 19 and attached to the through hole 26 via an O-ring 27. A hollow portion 22 is formed inside the resin casing 17. The hollow portion 22 extends in the direction parallel to the rotation axis X of the magnet rotor 12 over the inside and outside of the motor case 19 inside the resin casing 17. The hollow portion 22 accommodates a resin terminal block 28 and is potted together with the terminal block 28, and the positional relationship of the sensor substrate 14, the signal processing substrate 15, and the signal connection line 16 with respect to the resin housing 17 is fixed. .
この端子ブロック２８には、信号接続線１６が図示下側から図示上側にかけてインサートされており、図示下側に露出した信号接続線１６の一端にセンサ基板１４が接続されて固定され、図示上側に露出した信号接続線１６の他端に信号処理基板１５が接続されて固定される。 The signal connection line 16 is inserted into the terminal block 28 from the lower side of the drawing to the upper side of the drawing, and the sensor board 14 is connected and fixed to one end of the signal connection line 16 exposed on the lower side of the drawing, and is connected to the upper side of the drawing. The signal processing board 15 is connected and fixed to the other end of the exposed signal connection line 16.
この状態で端子ブロック２８が中空部２２に収納されることで、センサ基板１４がモータケース１９内に位置する中空部２２（樹脂筐体１７）の一端側２０に配置され、信号処理基板１５がモータケース１９外に位置する中空部２２（樹脂筐体１７）の他端側２３に配置され、信号接続線１６がＧＭＲ素子１３を挟んで磁石回転子１２と反対側に位置するように配線される。 When the terminal block 28 is accommodated in the hollow portion 22 in this state, the sensor substrate 14 is disposed on one end side 20 of the hollow portion 22 (resin casing 17) located in the motor case 19, and the signal processing substrate 15 is It is arranged on the other end side 23 of the hollow portion 22 (resin casing 17) located outside the motor case 19, and is wired so that the signal connection line 16 is located on the opposite side of the magnet rotor 12 with the GMR element 13 in between. The
このように、センサ基板１４を、モータケース１９内に位置する中空部２２の一端側２０に配置するのは、磁石回転子１２とできるだけ近接した位置にＧＭＲ素子１３を配置して、その検出感度を向上させるためである。 As described above, the sensor substrate 14 is arranged on one end side 20 of the hollow portion 22 located in the motor case 19 because the GMR element 13 is arranged as close as possible to the magnet rotor 12 and the detection sensitivity thereof. It is for improving.
特に、本実施の形態においては、中空部２２を区画形成する壁部のうち、磁石回転子１２の外周面２１に隣接する位置の壁部２９が他の壁部に比べて薄く形成されており、ＧＭＲ素子１３と磁石回転子１２との距離が極力短くなるようにされ、検出感度の更なる向上及び強度の両立が図られている。 In particular, in the present embodiment, among the wall portions that define the hollow portion 22, the wall portion 29 adjacent to the outer peripheral surface 21 of the magnet rotor 12 is formed thinner than the other wall portions. The distance between the GMR element 13 and the magnet rotor 12 is made as short as possible to further improve the detection sensitivity and achieve both strength.
一方、信号処理基板１５を、モータケース１９外に位置する中空部２２の他端側２３に配置するのは、温度が比較的低温となるモータケース１９の外部に信号処理基板１５を配置して、モータ１８の駆動により発生した熱で信号処理基板１５が高温化することによる誤作動を低減し、更には、当該高温化による信号処理基板１５の損傷を低減するためである。 On the other hand, the signal processing board 15 is arranged on the other end side 23 of the hollow portion 22 located outside the motor case 19 because the signal processing board 15 is arranged outside the motor case 19 where the temperature is relatively low. This is to reduce malfunction caused by the high temperature of the signal processing board 15 due to the heat generated by driving the motor 18, and further to reduce damage to the signal processing board 15 due to the high temperature.
ところで、ＧＭＲ素子１３と磁石回転子１２との間に信号接続線１６を配置すると、信号接続線１６に発生する渦電流で回転磁界が変化し、正しい検出ができない場合がある。そこで、信号接続線１６を、ＧＭＲ素子１３を挟んで磁石回転子１２の反対側に位置するように配線している。 By the way, when the signal connection line 16 is disposed between the GMR element 13 and the magnet rotor 12, the rotating magnetic field changes due to the eddy current generated in the signal connection line 16, and correct detection may not be performed. Therefore, the signal connection line 16 is wired so as to be located on the opposite side of the magnet rotor 12 with the GMR element 13 interposed therebetween.
また、図１の部分Ａの拡大図である図２に示すように、信号接続線１６は、一端が横方向に曲げられ、その後縦方向に曲げられて、信号処理基板１５と接続されている。即ち、信号接続線１６は、モータケース１９外に位置する一端がクランク状に形成され、信号処理基板１５と接続されている。このようにせずに、即ち、図３に示すように、信号接続線１６をセンサ基板１４から縦方向に直線状に信号処理基板１５に接続した場合、例えば、エラストマ等の軟らかい部材で中空部２２をポッティングすると、車両の振動等により、信号処理基板１５が信号処理基板１５と信号接続線１６との接続部分Ｃを支点に上下方向に揺れて、信号処理基板１５と信号接続線１６とのはんだ付け部分にストレスがかかってしまう。この場合、はんだ付け部分における信号処理基板１５と信号接続線１６との接続が外れてしまう場合がある。これに対し、図２に示したように信号接続線１６を信号処理基板１５と接続することで、エラストマ等の軟らかい部材で中空部２２をポッティングした場合であっても、車両の振動によるはんだ付け部分における信号処理基板１５と信号接続線１６との接続の外れを抑制することが可能である。 Further, as shown in FIG. 2 which is an enlarged view of a portion A in FIG. 1, one end of the signal connection line 16 is bent in the horizontal direction and then bent in the vertical direction, and is connected to the signal processing board 15. . That is, the signal connection line 16 is formed in a crank shape at one end located outside the motor case 19 and connected to the signal processing board 15. Without this, that is, as shown in FIG. 3, when the signal connection line 16 is connected to the signal processing board 15 in a straight line from the sensor board 14 in the vertical direction, for example, the hollow portion 22 is made of a soft member such as an elastomer. When the signal processing board 15 is potted, the signal processing board 15 swings up and down around the connection portion C between the signal processing board 15 and the signal connection line 16 due to the vibration of the vehicle or the like, and the solder between the signal processing board 15 and the signal connection line 16 is Stress will be applied to the attached part. In this case, the connection between the signal processing board 15 and the signal connection line 16 at the soldered portion may be disconnected. On the other hand, by connecting the signal connection line 16 to the signal processing board 15 as shown in FIG. 2, even when the hollow portion 22 is potted with a soft member such as an elastomer, soldering due to vehicle vibration is performed. It is possible to suppress disconnection of the signal processing board 15 and the signal connection line 16 in the portion.
また、樹脂筐体１７は、外部からのケーブル等を接続するコネクタ３０を有しており、このコネクタ３０内には、信号処理基板１５に接続されたコネクタピン３１が設けられる。 The resin casing 17 has a connector 30 for connecting an external cable or the like, and a connector pin 31 connected to the signal processing board 15 is provided in the connector 30.
以上説明したＧＭＲセンサ１０は、レゾルバよりも軽いＧＭＲセンサを用いているため軽量であり、また、センサ基板及び信号処理基板を磁石回転子１２の回転軸Ｘに沿って配置されているため、小型である。 The GMR sensor 10 described above is light because a GMR sensor that is lighter than a resolver is used, and the sensor substrate and the signal processing substrate are arranged along the rotation axis X of the magnet rotor 12, so that the GMR sensor 10 is compact. It is.
そして、ＧＭＲセンサ１０は、センサ基板１４がモータケース１９内に位置する中空部２２（樹脂筐体１７）の一端側２０に配置され、信号処理基板１５がモータケース１９外に位置する中空部２２（樹脂筐体１７）の他端側２３に配置されているため、モータ１８の駆動により発生した熱で信号処理基板１５が誤動作、更には、損傷するのを低減することができる。 In the GMR sensor 10, the sensor substrate 14 is disposed on one end side 20 of the hollow portion 22 (resin casing 17) located in the motor case 19, and the signal processing substrate 15 is located outside the motor case 19. Since it is arranged on the other end side 23 of the (resin casing 17), it is possible to reduce malfunction and damage of the signal processing board 15 due to heat generated by driving the motor 18.
また、ＧＭＲセンサ１０によれば、信号接続線１６がＧＭＲ素子１３を挟んで磁石回転子１２と反対側に位置するように配線されるため、信号接続線１６に発生する渦電流で回転磁界が変化するのを低減し、正確な回転速度や回転角を得ることができる。 Further, according to the GMR sensor 10, since the signal connection line 16 is wired so as to be located on the opposite side of the magnet rotor 12 with the GMR element 13 interposed therebetween, the rotating magnetic field is generated by the eddy current generated in the signal connection line 16. It is possible to reduce the change and obtain an accurate rotation speed and rotation angle.
従って、本発明によれば、軽量、小型でありながらも、高温環境下にある機器の測定をすることが可能であり、且つ渦電流の影響を低減することが可能である。 Therefore, according to the present invention, it is possible to measure a device in a high temperature environment while being lightweight and small, and to reduce the influence of eddy current.
１０ ＧＭＲセンサ
１１ モータロータ
１２ 磁石回転子
１３ ＧＭＲ素子
１４ センサ基板
１５ 信号処理基板
１６ 信号接続線
１７ 樹脂筐体
１８ モータ
１９ モータケース
２０ 一端側
２１ 外周面
２２ 中空部
２３ 他端側
２４ モータシャフト
２５ モータステータ
２６ 貫通孔
２７ Ｏリング
２８ 端子ブロック
２９ 壁部
３０ コネクタ
３１ コネクタピン
Ｃ 接続部分
Ｘ 回転軸
DESCRIPTION OF SYMBOLS 10 GMR sensor 11 Motor rotor 12 Magnet rotor 13 GMR element 14 Sensor board 15 Signal processing board 16 Signal connection line 17 Resin housing 18 Motor 19 Motor case 20 One end side 21 Outer peripheral surface 22 Hollow part 23 Other end side 24 Motor shaft 25 Motor Stator 26 Through-hole 27 O-ring 28 Terminal block 29 Wall portion 30 Connector 31 Connector pin C Connection portion X Rotating shaft
Claims (5)
前記磁石回転子で生成された回転磁界の変化による磁気抵抗の変動を検出すると共に検出信号を出力するＧＭＲ素子が搭載されたセンサ基板と、
前記ＧＭＲ素子から出力された検出信号を処理する信号処理基板と、
前記センサ基板と前記信号処理基板とを接続する信号接続線と、
を備え、
前記センサ基板、前記信号処理基板、及び前記信号接続線は、同一の樹脂筐体内に収納されると共に、前記磁石回転子は、機器の収納ケース内に収納されるＧＭＲセンサであって、
前記樹脂筐体は、前記収納ケースを貫通し、且つ一端側が前記磁石回転子の外周面に隣接しており、
前記センサ基板は、前記収納ケース内に位置する前記樹脂筐体の一端側に配置され、
前記信号処理基板は、前記収納ケース外に位置する前記樹脂筐体の他端側に配置され、
前記収納ケース内に位置する前記信号接続線は、前記ＧＭＲ素子を挟んで前記磁石回転子と反対側に位置するように配線されることを特徴とするＧＭＲセンサ。 A magnet rotor that generates a rotating magnetic field;
A sensor substrate on which a GMR element that detects a change in magnetoresistance due to a change in a rotating magnetic field generated by the magnet rotor and outputs a detection signal;
A signal processing board for processing a detection signal output from the GMR element;
A signal connection line connecting the sensor board and the signal processing board;
With
The sensor board, the signal processing board, and the signal connection line are housed in the same resin casing, and the magnet rotor is a GMR sensor housed in a storage case of a device,
The resin casing penetrates the storage case, and one end side is adjacent to the outer peripheral surface of the magnet rotor,
The sensor substrate is disposed on one end side of the resin casing located in the storage case,
The signal processing board is disposed on the other end side of the resin casing located outside the storage case,
The GMR sensor, wherein the signal connection line located in the storage case is wired so as to be located on the opposite side of the magnet rotor with the GMR element interposed therebetween.
前記中空部には、前記センサ基板、前記信号処理基板、及び前記信号接続線が収納される請求項１に記載のＧＭＲセンサ。 The resin casing is formed with a hollow portion extending in a direction parallel to the rotation axis of the magnet rotor across the inside and outside of the storage case,
The GMR sensor according to claim 1, wherein the sensor board, the signal processing board, and the signal connection line are accommodated in the hollow portion.
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| JPH11166840A (en) * | 1997-12-04 | 1999-06-22 | Toyota Motor Corp | Rotary sensor |
| JP2000171476A (en) * | 1998-12-09 | 2000-06-23 | Keihin Corp | Electromagnetic pickup sensor and its manufacture |
| JP4273363B2 (en) * | 2006-11-21 | 2009-06-03 | 日立金属株式会社 | Rotation angle detection device, rotator, and rotation angle detection method |
| JP2009186391A (en) * | 2008-02-08 | 2009-08-20 | Nsk Ltd | Apparatus for measuring quantity of state of rolling bearing unit |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11166840A (en) * | 1997-12-04 | 1999-06-22 | Toyota Motor Corp | Rotary sensor |
| JP2000171476A (en) * | 1998-12-09 | 2000-06-23 | Keihin Corp | Electromagnetic pickup sensor and its manufacture |
| JP4273363B2 (en) * | 2006-11-21 | 2009-06-03 | 日立金属株式会社 | Rotation angle detection device, rotator, and rotation angle detection method |
| JP2009186391A (en) * | 2008-02-08 | 2009-08-20 | Nsk Ltd | Apparatus for measuring quantity of state of rolling bearing unit |
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