JP2021515190A - 磁性ターゲットの回転動きの間の磁場影響力 - Google Patents
磁性ターゲットの回転動きの間の磁場影響力 Download PDFInfo
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Abstract
Description
[0007]第1のセットの磁場感知素子の最大感度の軸は、平面を規定し得るものであり、第2のセットの磁場感知素子の最大感度の軸は、平面を規定し得る。
[0009]第1の磁場感知素子の最大感度の軸は、第2の磁場感知素子の最大感度の軸に直交し得るものであり、第3の磁場感知素子の最大感度の軸は、第4の磁場感知素子の最大感度の軸に直交し得る。
[0012]回転する磁場は、磁場感知素子の第1および第2のセットを通る方向を有し得るものであり、第1の磁場感知素子の最大感度の軸の角度は、磁場感知素子の第1および第2のセットにより規定される中心線に対して約180度であり、第2の磁場感知素子の最大感度の軸の角度は、磁場感知素子の第1および第2のセットにより規定される中心線に対して約90度であり、第3の磁場感知素子の最大感度の軸の角度は、磁場感知素子の第1および第2のセットにより規定される中心線に対して約180度であり、第4の磁場感知素子の最大感度の軸の角度は、磁場感知素子の第1および第2のセットにより規定される中心線に対して約90度である。
[0014]第1の磁場感知素子の最大感度の軸の角度は、漏洩磁場の予測される方向に対して約90度であり得るものであり、第2の磁場感知素子の最大感度の軸の角度は、漏洩磁場の予測される方向に対して約45度であり得るものであり、第3の磁場感知素子の最大感度の軸の角度は、漏洩磁場の予測される方向に対して約90度であり得るものであり、第4の磁場感知素子の最大感度の軸の角度は、漏洩磁場の予測される方向に対して約45度であり得る。
[0016]円柱の第1の半分は、第1の磁気極性を有し得るものであり、円柱の第2の半分は、第2の磁気極性を有し得る。
[0018]円柱は、4つの四分区間により規定され得るものであり、近接する四分区間は、反対の磁気極性を有する。
[0020]処理回路が、磁場感知素子の出力信号を受信し、磁場の検出される角度を算出するために結合され得る。
[0022]処理回路は、逆正接関数を実行するための回路、正弦関数を実行するための回路、および、余弦関数を実行するための回路のうちの1つまたは複数を含み得る。
H1y = AB1sinθB + ABstraysinθstray (1)
H1x = AB1cosθB + ABstraycosθstray (2)
H2y = AkB1sinθB + ABstraysinθstray (3)
H2x = AkB1cosθB + ABstraycosθstray (4)
上記の式において、H1yは、磁場感知素子216の出力信号であり、H1xは、磁場感知素子214の出力信号であり、H2yは、磁場感知素子222の出力であり、H2xは、磁場感知素子222の出力であり、Aは、磁場感知素子のスカラ感度因子であり、B1は、磁場206であり、Bstrayは、漏洩磁場210であり、kは、セット212およびセット218(図2を確認されたい)により検出されるような磁場強さにおいての差を表すスケーリング因子である。
Hydiff = (1−k)AB1sinθB (5)
Hxdiff = (1−k)AB1cosθB (6)
磁場の回転の角度は、後に続く算式によって算出され得る。
[0081]本特許の主題である、様々な概念、構造、および技法を例解する役目をする、好まれる実施形態を説明したので、これらの概念、構造、および技法を組み込む他の実施形態が使用され得るということは、今や当業者に明白になるであろう。よって、本特許のその範囲は、説明された実施形態に限定されるべきではなく、むしろ、後に続く特許請求の範囲の趣旨および範囲によってのみで限定されるべきであるということが提言される。本開示において引用されるすべての参照文献は、それらの全体において参照によりここに組み込まれる。
Claims (22)
- 回転する磁場を生み出す磁性ターゲットと、
前記磁性ターゲットとの隔置された関係で配置され、少なくとも第1の磁場感知素子および第2の磁場感知素子を備える、磁場感知素子の第1のセットであって、各々の磁場感知素子は最大感度の軸を有する、磁場感知素子の第1のセットと、
前記磁性ターゲットとの隔置された関係で配置され、少なくとも第3の磁場感知素子および第4の磁場感知素子を備える、磁場感知素子の第2のセットであって、各々の磁場感知素子は最大感度の軸を有する、磁場感知素子の第2のセットと
を備え、
磁場感知素子の前記第1のセットは、磁場感知素子の前記第2のセットより、前記磁性ターゲットの近くに位置決めされる、システム。 - 前記第1のセットの前記磁場感知素子の最大感度の前記軸は、平面を規定し、前記第2のセットの前記磁場感知素子の最大感度の前記軸は、平面を規定する、請求項1に記載のシステム。
- 前記第1のセットにより規定される前記平面、および、前記第2のセットにより規定される前記平面は、同じ平面である、請求項2に記載のシステム。
- 前記第1の磁場感知素子の最大感度の前記軸は、前記第2の磁場感知素子の最大感度の前記軸に直交し、
前記第3の磁場感知素子の最大感度の前記軸は、前記第4の磁場感知素子の最大感度の前記軸に直交する、
請求項1に記載のシステム。 - 前記第1の磁場感知素子の最大感度の前記軸は、前記第3の磁場感知素子の最大感度の前記軸に平行であり、
前記第3の磁場感知素子の最大感度の前記軸は、前記第4の磁場感知素子の最大感度の前記軸に平行である、
請求項4に記載のシステム。 - 磁場感知素子は、前記磁場感知素子のそれぞれの最大感度の軸が、前記磁場に対して、それぞれのあらかじめ決定された角度にあるように配置される、請求項1に記載のシステム。
- 前記第1の磁場感知素子の最大感度の前記軸の前記角度は、磁場感知素子の前記第1および第2のセットにより規定される中心線に対して約180度であり、
前記第2の磁場感知素子の最大感度の前記軸の前記角度は、磁場感知素子の前記第1および第2のセットにより規定される前記中心線に対して約90度であり、
前記第3の磁場感知素子の最大感度の前記軸の前記角度は、磁場感知素子の前記第1および第2のセットにより規定される前記中心線に対して約180度であり、
前記第4の磁場感知素子の最大感度の前記軸の前記角度は、磁場感知素子の前記第1および第2のセットにより規定される前記中心線に対して約90度である、
請求項6に記載のシステム。 - 前記磁場感知素子は、前記磁場感知素子のそれぞれの最大感度の軸が、漏洩(stray)磁場の予測される方向に対して、あらかじめ決定された角度にあるように配置される、請求項1に記載のシステム。
- 前記第1の磁場感知素子の最大感度の前記軸の前記角度は、前記漏洩磁場の前記予測される方向に対して、第1の角度に位置決めされ、
前記第2の磁場感知素子の最大感度の前記軸の前記角度は、前記漏洩磁場の前記予測される方向に対して、第2の角度に位置決めされ、
前記第3の磁場感知素子の最大感度の前記軸の前記角度は、前記漏洩磁場の前記予測される方向に対して、前記第1の角度に位置決めされ、
前記第4の磁場感知素子の最大感度の前記軸の前記角度は、前記漏洩磁場の前記予測される方向に対して、前記第2の角度に位置決めされる、
請求項8に記載のシステム。 - 前記ターゲットは、円柱を含む本体を含む、請求項1に記載のシステム。
- 前記円柱の第1の半分は、第1の磁気極性を有し、前記円柱の第2の半分は、第2の磁気極性を有する、請求項10に記載のシステム。
- 前記円柱の前記第1および第2の半分は、前記円柱の軸が通って延びる平面により規定される、請求項11に記載のシステム。
- 前記円柱は、4つの四分区間(four quadrants)により規定され、近接する四分区間は、反対の磁気極性を有する、請求項10に記載のシステム。
- 前記ターゲットは、棒を含む、請求項1に記載のシステム。
- 前記棒は、異なる磁気極性を有する2つ以上のセグメントを含む、請求項14に記載のシステム。
- 各々の磁場感知素子は、それぞれの前記磁場感知素子により検出されるような前記磁場を表す出力信号を生み出す、請求項1に記載のシステム。
- 前記磁場感知素子の出力信号を受信し、前記磁場の検出される角度を算出するために結合される処理回路をさらに備える、請求項14に記載のシステム。
- 処理回路は、磁場感知素子の前記第1のセットから前記第2のセットへの線に実質的に直交する方向を有する漏洩磁場の影響を打ち消すように構成される、請求項15に記載のシステム。
- 処理回路は、逆正接関数を実行するための回路、正弦関数を実行するための回路、および、余弦関数を実行するための回路のうちの1つまたは複数を含む、請求項16に記載のシステム。
- 回転する磁場を生み出す磁性ターゲットと、
前記磁場を検出し、前記磁場を表す1つまたは複数の信号を生み出すための手段と、
前記1つまたは複数の信号から、前記回転する磁場の角度を算出するための手段と、
前記角度の前記算出から漏洩磁場の影響を打ち消すための手段と
を備える、システム。 - 回転する磁場を生み出す磁性ターゲットと、
前記磁場を検出するために前記磁性ターゲットとの隔置された関係で配置される磁場感知素子の第1のセットと、
前記磁場を検出するために前記磁性ターゲットとの隔置された関係で配置される磁場感知素子の第2のセットであって、磁場感知素子の前記第1のセットは、磁場感知素子の前記第1のセットが、磁場感知素子の前記第2のセットが検出するより強い磁場を検出するように、磁場感知素子の前記第2のセットより、前記磁場の中心点の近くに位置決めされる、磁場感知素子の第2のセットと
を備え、
磁場感知素子の前記第1および第2のセットは、両方のセットが、ほぼ等しい強さで、漏洩磁場を検出するように配置される、システム。 - 回転する磁場を生み出す磁性ターゲットと、
前記磁場を検出するために前記磁性ターゲットとの隔置された関係で配置される磁場感知素子の第1のセットと、
前記磁場を検出するために前記磁性ターゲットとの隔置された関係で配置される磁場感知素子の第2のセットであって、磁場感知素子の前記第1のセットは、磁場感知素子の前記第1のセットが、磁場感知素子の前記第2のセットが検出するより強い磁場を検出するように位置決めされる、磁場感知素子の第2のセットと
を備え、
磁場感知素子の前記第1および第2のセットは、両方のセットが、ほぼ等しい強さを伴って、漏洩磁場を検出するように配置される、システム。
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US10866117B2 (en) | 2018-03-01 | 2020-12-15 | Allegro Microsystems, Llc | Magnetic field influence during rotation movement of magnetic target |
FR3082615B1 (fr) * | 2018-06-15 | 2020-10-16 | Electricfil Automotive | Methode de determination d'une position angulaire relative entre deux pieces |
US11371824B2 (en) * | 2019-11-21 | 2022-06-28 | Infineon Technologies Ag | Stray field robust out of shaft angle sensor and measurement system |
US11604058B2 (en) | 2020-02-25 | 2023-03-14 | Allegro Microsystems, Llc | Reducing stray magnetic field effect on an angle sensor |
US11733316B2 (en) * | 2020-12-14 | 2023-08-22 | Allegro Microsystems, Llc | Position sensor having harmonic distortion compensation |
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US20210055129A1 (en) | 2021-02-25 |
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