JP2009103467A - Rotation detecting device - Google Patents

Rotation detecting device Download PDF

Info

Publication number
JP2009103467A
JP2009103467A JP2007272854A JP2007272854A JP2009103467A JP 2009103467 A JP2009103467 A JP 2009103467A JP 2007272854 A JP2007272854 A JP 2007272854A JP 2007272854 A JP2007272854 A JP 2007272854A JP 2009103467 A JP2009103467 A JP 2009103467A
Authority
JP
Japan
Prior art keywords
magnetic
threshold
threshold value
rotation
detection
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.)
Granted
Application number
JP2007272854A
Other languages
Japanese (ja)
Other versions
JP4882955B2 (en
Inventor
Yuichi Sakaguchi
友一 坂口
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2007272854A priority Critical patent/JP4882955B2/en
Publication of JP2009103467A publication Critical patent/JP2009103467A/en
Application granted granted Critical
Publication of JP4882955B2 publication Critical patent/JP4882955B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation detecting device capable of performing rotation detection at an early stage, while preventing misdetection due to disturbances. <P>SOLUTION: This rotation detecting device 1 includes a toroidal magnetic encoder 3, formed by alternately magnetizing each N-pole and each S-pole; Hall sensors 4A-4C, arranged side by side in the circumferential direction of the magnetic encoder 3, for detecting the magnetic flux density of the magnetic encoder 3; and a CPU 5. The Hall sensors 4A-4C perform ON-output, when the magnetic flux density of the magnetic encoder 3 becomes higher than the threshold for magnetism detection. The threshold for magnetism detection includes a threshold A and a threshold B, which is smaller than the threshold A. When some of the output signals from the Hall sensors 4A-4C go into ON-state through the rotation of the magnetic encoder 3, the CPU 5 switches the threshold for magnetism detection of other Hall sensors, from the threshold A to the threshold B, successively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えばモータ等の回転部品の回転を検出する回転検出装置に関するものである。   The present invention relates to a rotation detection device that detects rotation of a rotating component such as a motor.

従来の回転検出装置としては、例えば特許文献１に記載されているように、磁気エンコーダの周方向に並んで配置された２つの磁気センサのＯＮ／ＯＦＦ出力により、回転を検出するものが知られている。
特開２００４−１１７３１８号公報 As a conventional rotation detection device, for example, as described in Patent Document 1, a device that detects rotation by ON / OFF output of two magnetic sensors arranged side by side in the circumferential direction of a magnetic encoder is known. ing.
JP 2004-117318 A

磁気センサの中には、磁気エンコーダの磁束密度を磁気検出用閾値と比較し、磁気検出用閾値以上の磁束密度が検出されるとＯＮ出力するものがある。この場合、磁気ノイズ等の外乱による誤検出を防止するために磁気検出用閾値を大きくすると、ＯＮ判定までに時間がかかり、回転検出が遅れるという問題が生じる。   Some magnetic sensors compare the magnetic flux density of a magnetic encoder with a magnetic detection threshold value and output ON when a magnetic flux density equal to or higher than the magnetic detection threshold value is detected. In this case, if the magnetic detection threshold value is increased in order to prevent erroneous detection due to disturbance such as magnetic noise, it takes time until the ON determination is made, resulting in a problem that rotation detection is delayed.

本発明の目的は、外乱による誤検出を防止しつつ、回転検出を早期に行うことができる回転検出装置を提供することである。   The objective of this invention is providing the rotation detection apparatus which can perform rotation detection at an early stage, preventing the misdetection by disturbance.

本発明の回転検出装置は、Ｎ極及びＳ極を交互に着磁させてなる環状の磁気エンコーダと、磁気エンコーダの周方向に並んで配置され、磁気エンコーダの磁束密度を磁気検出用閾値と比較して磁気エンコーダの回転を検出する複数の磁気センサと、各磁気センサの磁気検出用閾値を制御する閾値制御手段とを備え、磁気検出用閾値は、第１閾値と、第１閾値よりも小さい第２閾値とを含み、閾値制御手段は、まず各磁気センサの磁気検出用閾値を第１閾値に設定し、複数の磁気センサの何れかにより磁気エンコーダの回転が検出されると、磁気エンコーダの回転方向に隣接する他の磁気センサの磁気検出用閾値を第１閾値から第２閾値に切り換えることを特徴とするものである。   The rotation detection device of the present invention is arranged in an annular magnetic encoder in which N poles and S poles are alternately magnetized, and arranged in the circumferential direction of the magnetic encoder, and compares the magnetic flux density of the magnetic encoder with a magnetic detection threshold value. A plurality of magnetic sensors for detecting the rotation of the magnetic encoder, and threshold control means for controlling the magnetic detection threshold of each magnetic sensor, the magnetic detection threshold being smaller than the first threshold and the first threshold The threshold control means first sets the magnetic detection threshold of each magnetic sensor to the first threshold, and when rotation of the magnetic encoder is detected by any of the plurality of magnetic sensors, The magnetic detection threshold value of another magnetic sensor adjacent in the rotation direction is switched from the first threshold value to the second threshold value.

上記のように磁気エンコーダと複数の磁気センサとを備えた回転検出装置において、磁気センサの検出感度を良くするために磁気検出用閾値を常に低めに設定すると、磁気ノイズ等の外乱による誤検出が生じる可能性が高くなる。一方、磁気検出用閾値を常に高めに設定すると、磁気エンコーダの磁束密度が磁気検出用閾値より大きくなるタイミングが遅れるため、回転検出が遅くなってしまう。   In the rotation detection device having the magnetic encoder and the plurality of magnetic sensors as described above, if the magnetic detection threshold is always set low in order to improve the detection sensitivity of the magnetic sensor, erroneous detection due to disturbance such as magnetic noise may occur. Is more likely to occur. On the other hand, if the threshold value for magnetic detection is always set higher, the timing at which the magnetic flux density of the magnetic encoder becomes larger than the threshold value for magnetic detection is delayed, so that rotation detection is delayed.

そこで本発明では、磁気検出用閾値として第１閾値及び第２閾値の２つを設定し、最初は各磁気センサにより磁気エンコーダの磁束密度を高いほうの第１閾値と比較する。これにより、磁気ノイズ等の外乱による誤検出を防止することができる。そして、何れかの磁気センサにより磁気エンコーダの回転が検出されると、磁気エンコーダの回転方向に隣接する他の磁気センサの磁気検出用閾値を第１閾値から第２閾値に切り換え、磁気エンコーダの磁束密度を低いほうの第２閾値と比較する。これにより、磁気エンコーダの磁束密度が磁気検出用閾値より大きくなるタイミングが早くなるため、回転検出を早期に行うことができる。   Therefore, in the present invention, two threshold values, the first threshold value and the second threshold value, are set as the magnetic detection threshold values, and the magnetic sensor magnetic flux density is first compared with the higher first threshold value by each magnetic sensor. As a result, erroneous detection due to disturbance such as magnetic noise can be prevented. When rotation of the magnetic encoder is detected by any one of the magnetic sensors, the magnetic detection threshold of another magnetic sensor adjacent in the rotation direction of the magnetic encoder is switched from the first threshold to the second threshold, and the magnetic flux of the magnetic encoder is changed. Compare the density with the lower second threshold. As a result, the timing at which the magnetic flux density of the magnetic encoder becomes larger than the magnetic detection threshold is advanced, so that the rotation can be detected early.

好ましくは、各磁気センサは、磁気エンコーダの磁束密度が磁気検出用閾値よりも大きいときにＯＮ出力し、閾値制御手段は、複数の磁気センサの何れかがＯＮ出力されると、他の磁気センサの磁気検出用閾値を第１閾値から第２閾値に切り換える。この場合には、何れかの磁気センサのＯＮ出力タイミングに応じて、磁気エンコーダの回転方向に隣接する他の磁気センサの磁気検出用閾値が切り換えられるため、回転検出を精度良く行うことができる。   Preferably, each magnetic sensor outputs an ON signal when the magnetic flux density of the magnetic encoder is larger than a threshold value for magnetic detection, and the threshold value control means outputs another magnetic sensor when any one of the plurality of magnetic sensors is output as an ON signal. Is switched from the first threshold value to the second threshold value. In this case, since the magnetic detection threshold value of another magnetic sensor adjacent in the rotation direction of the magnetic encoder is switched according to the ON output timing of any of the magnetic sensors, rotation detection can be performed with high accuracy.

本発明によれば、外乱による誤検出を防止しつつ、回転検出を早期に行うことができる。これにより、モータ等の回転部品の性能を向上させることが可能となる。   According to the present invention, it is possible to detect rotation early while preventing erroneous detection due to disturbance. Thereby, it becomes possible to improve the performance of rotating parts, such as a motor.

以下、本発明に係わる回転検出装置の好適な実施形態について、図面を参照して詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a rotation detection device according to the present invention will be described in detail with reference to the drawings.

図１は、本発明に係わる回転検出装置の一実施形態を示す平面図であり、図２は、図１に示す回転検出装置の部分断面図である。各図において、本実施形態の回転検出装置１は基板２を備え、この基板２の裏面側には、円周方向にＮ極及びＳ極を例えば４つずつ交互に着磁させてなる環状の磁気エンコーダ３が配置されている。磁気エンコーダ３は、図示しない回転体（ここではモータ）に取り付けられている。   FIG. 1 is a plan view showing an embodiment of a rotation detection device according to the present invention, and FIG. 2 is a partial sectional view of the rotation detection device shown in FIG. In each figure, the rotation detection device 1 according to the present embodiment includes a substrate 2, and on the back side of the substrate 2, for example, four annular N poles and four S poles are alternately magnetized in the circumferential direction. A magnetic encoder 3 is arranged. The magnetic encoder 3 is attached to a rotating body (here, a motor) (not shown).

また、回転検出装置１は、基板２の表面上に実装されたＩＣタイプのホールセンサ（磁気センサ）４Ａ〜４Ｃ及びＣＰＵ５を備えている。なお、ホールセンサの数としては、上記のような３つに限られず、２つ以上あれば良い。   The rotation detection device 1 includes IC type Hall sensors (magnetic sensors) 4A to 4C and a CPU 5 mounted on the surface of the substrate 2. Note that the number of hall sensors is not limited to three as described above, but may be two or more.

ホールセンサ４Ａ〜４Ｃは、磁気エンコーダ３の周方向に沿って並んで配置されている。ホールセンサ４Ａ〜４Ｃは、図示しない磁界検出部及びスイッチ部を内蔵しており、磁気エンコーダ３の磁束密度（磁界）を検出する。具体的には、ホールセンサ４Ａ〜４Ｃは、図３に示すように、磁気エンコーダ３の磁束密度（１点鎖線Ｐ）を磁気検出用閾値（スレッショルドレベル）と比較し、磁気エンコーダ３の磁束密度が磁気検出用閾値よりも高くなると、所定時間ＴだけＯＮ出力する。   Hall sensors 4 </ b> A to 4 </ b> C are arranged side by side along the circumferential direction of magnetic encoder 3. The Hall sensors 4A to 4C have a built-in magnetic field detection unit and switch unit (not shown), and detect the magnetic flux density (magnetic field) of the magnetic encoder 3. Specifically, as shown in FIG. 3, the Hall sensors 4 </ b> A to 4 </ b> C compare the magnetic flux density (one-dot chain line P) of the magnetic encoder 3 with the magnetic detection threshold (threshold level), and the magnetic flux density of the magnetic encoder 3. Becomes higher than the magnetic detection threshold, the output is turned ON for a predetermined time T.

ホールセンサ４Ａ〜４Ｃの磁気検出用閾値としては、図３に示すように、閾値Ａ（破線）及び閾値Ｂ（実線）が設定されている。閾値Ａは、磁気エンコーダ３の磁気変化を確実に検出できると共に磁気ノイズ等の外乱による誤検出を確実に防止できる程度に設定されている。閾値Ｂは、閾値Ａに比べて十分低く設定されている。これらの閾値Ａ及び閾値Ｂの切り換えは、ＣＰＵ５の制御により行われる。   As threshold values for magnetic detection of the hall sensors 4A to 4C, as shown in FIG. 3, a threshold value A (broken line) and a threshold value B (solid line) are set. The threshold A is set to such an extent that the magnetic change of the magnetic encoder 3 can be reliably detected and erroneous detection due to disturbance such as magnetic noise can be reliably prevented. The threshold value B is set sufficiently lower than the threshold value A. Switching between the threshold value A and the threshold value B is performed under the control of the CPU 5.

ＣＰＵ５は、ホールセンサ４Ａ〜４Ｃのリード端子と接続されている。ＣＰＵ５は、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値の切換制御を行うと共に、ホールセンサ４Ａ〜４Ｃの出力信号を入力し、磁気エンコーダ３の回転検知を行う。   The CPU 5 is connected to the lead terminals of the hall sensors 4A to 4C. The CPU 5 performs switching control of the magnetic detection threshold values of the hall sensors 4A to 4C and inputs the output signals of the hall sensors 4A to 4C to detect the rotation of the magnetic encoder 3.

図４は、ＣＰＵ５が実行する回転検知処理手順の詳細を示すフローチャートである。なお、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値は、最初は高い方の閾値Ａに設定されている。   FIG. 4 is a flowchart showing details of the rotation detection processing procedure executed by the CPU 5. The magnetic detection threshold values of the hall sensors 4A to 4C are initially set to the higher threshold value A.

図４において、まず磁気エンコーダ３が回転することでホールセンサ４Ａ〜４Ｃの何れかの出力信号がＯＮになったかどうかを判断する（手順Ｓ５１）。ホールセンサ４Ａ〜４Ｃの何れかの出力信号がＯＮになったと判断されたときは、他の２つのホールセンサに磁気エンコーダ３の回転方向に隣接する側から順に閾値切換制御信号を送出し、他の２つのホールセンサの磁気検出用閾値を閾値Ａから閾値Ｂに順次切り換える（手順Ｓ５２）。   In FIG. 4, first, it is determined whether or not any of the output signals of the hall sensors 4A to 4C is turned on by rotating the magnetic encoder 3 (step S51). When it is determined that the output signal of any of the hall sensors 4A to 4C is ON, the threshold switching control signal is sent to the other two hall sensors in order from the side adjacent to the rotation direction of the magnetic encoder 3, Are sequentially switched from threshold A to threshold B (step S52).

その後、他の２つのホールセンサの出力信号が順次ＯＮになったかどうかを判断し（手順Ｓ５３）、当該２つのホールセンサの出力信号がＯＮになったと判断されたときは、磁気エンコーダ３の回転方向を特定する（手順Ｓ５４）。   Thereafter, it is determined whether the output signals of the other two hall sensors are sequentially turned on (step S53). When it is determined that the output signals of the two hall sensors are turned on, the rotation of the magnetic encoder 3 is performed. A direction is specified (step S54).

具体的には、例えば磁気エンコーダ３が時計回りに回転する場合には、図５に示すように、ホールセンサ４Ａの出力信号がＯＮになったときに、ホールセンサ４Ｂ，４Ｃに閾値切換制御信号を順次送出し、ホールセンサ４Ｂ，４Ｃの磁気検出用閾値を閾値Ａから閾値Ｂに切り換える。そして、ホールセンサ４Ｂ，４Ｃの出力信号が順次ＯＮになったときは、磁気エンコーダ３が時計回りに回転していると判断される。これにより、モータ（図示せず）が時計回りに回転していると判断されることとなる。   Specifically, for example, when the magnetic encoder 3 rotates clockwise, as shown in FIG. 5, when the output signal of the hall sensor 4A is turned on, the threshold value switching control signal is sent to the hall sensors 4B and 4C. Are sequentially sent, and the threshold for magnetic detection of the Hall sensors 4B and 4C is switched from the threshold A to the threshold B. When the output signals of the hall sensors 4B and 4C are sequentially turned ON, it is determined that the magnetic encoder 3 is rotating clockwise. As a result, it is determined that the motor (not shown) is rotating clockwise.

以上において、手順Ｓ５１，Ｓ５２は、各磁気センサ４Ａ〜４Ｃの磁気検出用閾値を制御する閾値制御手段を構成するものである。   In the above, procedures S51 and S52 constitute a threshold control means for controlling the magnetic detection threshold of each of the magnetic sensors 4A to 4C.

ところで、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値を常時閾値Ｂとした場合には、図３に示すように、磁気ノイズが生じたときにホールセンサ４Ａ〜４Ｃの出力を誤検出してしまう。   By the way, when the magnetic detection threshold value of the Hall sensors 4A to 4C is always set to the threshold value B, as shown in FIG. 3, when magnetic noise occurs, the outputs of the Hall sensors 4A to 4C are erroneously detected.

一方、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値を常時閾値Ａとした場合には、図３に示すように、閾値Ｂを用いた場合に比べてＯＮ出力タイミングがｔ０時間だけ遅くなる。このため、図５の破線に示すように、ホールセンサ４Ｂ，４Ｃの出力信号がＯＮと判定するまでに時間がかかるため、磁気エンコーダ３の回転動作の検知が遅れることになる。 On the other hand, when it is always the threshold A magnetic detection threshold of the Hall sensor 4A~4C, as shown in FIG. 3, ON output timing is delayed by t 0 hours as compared with the case of using the threshold value B. For this reason, as shown by the broken line in FIG. 5, it takes time until the output signals of the Hall sensors 4B and 4C are determined to be ON, so that the detection of the rotation operation of the magnetic encoder 3 is delayed.

これに対し本実施形態では、まず最初は磁気ノイズによる誤検出を抑制するために、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値を閾値Ａに設定しておき、例えば磁気エンコーダ３が時計回りに回転することでホールセンサ４ＡがＯＮ出力されたときには、他のホールセンサ４Ｂ，４Ｃの磁気検出用閾値を閾値Ａから閾値Ｂに切り換える。このため、図５の実線に示すように、ホールセンサ４Ｂ，４Ｃの磁気検出用閾値を閾値Ａとした場合に比べてホールセンサ４Ｂ，４Ｃがｔ０時間だけ早くＯＮ出力されるようになる。これにより、磁気エンコーダ３ひいてはモータの回転動作の検知を早期に行うことができる。その結果、モータ性能を向上させることが可能となる。 On the other hand, in the present embodiment, first, in order to suppress erroneous detection due to magnetic noise, the magnetic detection threshold value of the Hall sensors 4A to 4C is set to the threshold value A. For example, the magnetic encoder 3 rotates clockwise. Thus, when the Hall sensor 4A is turned ON, the magnetic detection threshold values of the other Hall sensors 4B and 4C are switched from the threshold value A to the threshold value B. Therefore, as shown in solid line in FIG. 5, so that the Hall sensors 4B, 4C are quickly ON output only t 0 hours as compared with the case where the Hall sensors 4B, the magnetic detection threshold of 4C and the threshold value A. As a result, the magnetic encoder 3 and thus the rotation of the motor can be detected at an early stage. As a result, motor performance can be improved.

なお、本発明は、上記実施形態に限定されるものではなく種々変形可能である。例えば、ホールセンサ４Ａ〜４Ｃの何れかの出力信号がＯＮとなる時間Ｔを用いて磁気エンコーダ３の回転速度を算出し、隣のホールセンサに磁気エンコーダ３が近づく速度であると判定し、当該ホールセンサの磁気検出用閾値を閾値Ａから閾値Ｂに切り換えるようにしても良い。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the rotational speed of the magnetic encoder 3 is calculated using the time T when the output signal of any one of the Hall sensors 4A to 4C is ON, and it is determined that the magnetic encoder 3 approaches the adjacent Hall sensor. The magnetic detection threshold value of the Hall sensor may be switched from the threshold value A to the threshold value B.

また、上記実施形態では、ホールセンサ４Ａ〜４Ｃの出力を受けるＣＰＵ５からの制御信号によりホールセンサ４Ａ〜４Ｃの磁気検出用閾値を切り換えるようにしたが、ホールセンサ４Ａ〜４Ｃの磁気検出用閾値を切り換える手段としては特にこれに限られず、例えば専用のＣＰＵ等を設けても良い。   Moreover, in the said embodiment, although the threshold value for magnetic detection of Hall sensors 4A-4C was switched by the control signal from CPU5 which receives the output of Hall sensors 4A-4C, the threshold value for magnetic detection of Hall sensors 4A-4C was changed. The switching means is not particularly limited to this, and for example, a dedicated CPU or the like may be provided.

本発明に係わる回転検出装置の一実施形態を示す平面図である。It is a top view which shows one Embodiment of the rotation detection apparatus concerning this invention. 図１に示す回転検出装置の部分断面図である。It is a fragmentary sectional view of the rotation detection apparatus shown in FIG. 図１に示した磁気エンコーダの磁束密度とホールセンサの磁気検出用閾値との関係を示す図である。It is a figure which shows the relationship between the magnetic flux density of the magnetic encoder shown in FIG. 1, and the threshold value for magnetic detection of a Hall sensor. 図１に示したＣＰＵが実行する回転検知処理手順の詳細を示すフローチャートである。It is a flowchart which shows the detail of the rotation detection process procedure which CPU shown in FIG. 1 performs. 図１に示した各ホールセンサのＯＮ出力のタイミング示す図である。It is a figure which shows the timing of ON output of each Hall sensor shown in FIG.

符号の説明Explanation of symbols

１…回転検出装置、３…磁気エンコーダ、４Ａ〜４Ｃ…ホールセンサ（磁気センサ）、５…ＣＰＵ（閾値制御手段）、Ａ…閾値（第１閾値、磁気検出用閾値）、Ｂ…閾値（第２閾値、磁気検出用閾値）。   DESCRIPTION OF SYMBOLS 1 ... Rotation detection apparatus, 3 ... Magnetic encoder, 4A-4C ... Hall sensor (magnetic sensor), 5 ... CPU (threshold control means), A ... Threshold value (1st threshold value, threshold value for magnetic detection), B ... Threshold value (1st) 2 threshold, threshold for magnetic detection).

Claims (2)

Ｎ極及びＳ極を交互に着磁させてなる環状の磁気エンコーダと、
前記磁気エンコーダの周方向に並んで配置され、前記磁気エンコーダの磁束密度を磁気検出用閾値と比較して前記磁気エンコーダの回転を検出する複数の磁気センサと、
前記各磁気センサの前記磁気検出用閾値を制御する閾値制御手段とを備え、
前記磁気検出用閾値は、第１閾値と、前記第１閾値よりも小さい第２閾値とを含み、
前記閾値制御手段は、まず前記各磁気センサの前記磁気検出用閾値を前記第１閾値に設定し、前記複数の磁気センサの何れかにより前記磁気エンコーダの回転が検出されると、前記磁気エンコーダの回転方向に隣接する他の前記磁気センサの前記磁気検出用閾値を前記第１閾値から前記第２閾値に切り換えることを特徴とする回転検出装置。 An annular magnetic encoder formed by alternately magnetizing N and S poles;
A plurality of magnetic sensors arranged side by side in the circumferential direction of the magnetic encoder and detecting the rotation of the magnetic encoder by comparing the magnetic flux density of the magnetic encoder with a magnetic detection threshold;
Threshold control means for controlling the magnetic detection threshold of each of the magnetic sensors;
The magnetic detection threshold value includes a first threshold value and a second threshold value smaller than the first threshold value,
The threshold control means first sets the magnetic detection threshold of each magnetic sensor to the first threshold, and when rotation of the magnetic encoder is detected by any of the plurality of magnetic sensors, A rotation detection device that switches the magnetic detection threshold value of another magnetic sensor adjacent to the rotation direction from the first threshold value to the second threshold value. 前記各磁気センサは、前記磁気エンコーダの磁束密度が前記磁気検出用閾値よりも大きいときにＯＮ出力し、
前記閾値制御手段は、前記複数の磁気センサの何れかがＯＮ出力されると、前記他の磁気センサの前記磁気検出用閾値を前記第１閾値から前記第２閾値に切り換えることを特徴とする請求項１記載の回転検出装置。



Each magnetic sensor outputs ON when the magnetic flux density of the magnetic encoder is larger than the magnetic detection threshold,
The threshold control means switches the magnetic detection threshold of the other magnetic sensor from the first threshold to the second threshold when any of the plurality of magnetic sensors is turned ON. Item 2. The rotation detection device according to Item 1.



JP2007272854A 2007-10-19 2007-10-19 Rotation detector Expired - Fee Related JP4882955B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007272854A JP4882955B2 (en) 2007-10-19 2007-10-19 Rotation detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007272854A JP4882955B2 (en) 2007-10-19 2007-10-19 Rotation detector

Publications (2)

Publication Number Publication Date
JP2009103467A true JP2009103467A (en) 2009-05-14
JP4882955B2 JP4882955B2 (en) 2012-02-22

Family

ID=40705285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007272854A Expired - Fee Related JP4882955B2 (en) 2007-10-19 2007-10-19 Rotation detector

Country Status (1)

Country Link
JP (1) JP4882955B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012099052A (en) * 2010-11-05 2012-05-24 Nec Infrontia Corp Terminal device
WO2022260290A1 (en) * 2021-06-08 2022-12-15 삼성전자주식회사 Device and method for correcting magnetic field data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012099052A (en) * 2010-11-05 2012-05-24 Nec Infrontia Corp Terminal device
WO2022260290A1 (en) * 2021-06-08 2022-12-15 삼성전자주식회사 Device and method for correcting magnetic field data

Also Published As

Publication number Publication date
JP4882955B2 (en) 2012-02-22

Similar Documents

Publication Publication Date Title
US10931175B2 (en) Magnet ring with jittered poles
JP2006220530A (en) Device for detecting absolute angle of rotation
JP2006226816A (en) Rotation angle detector
JP4882955B2 (en) Rotation detector
US7369063B2 (en) Encoder signal processing circuit including a direction determining/counting unit
JP6245052B2 (en) Rotation detector
JP2007024887A (en) Angle measuring apparatus
JP3855801B2 (en) Rotation detector
JP2011089935A (en) Resolver abnormality detector
JP4797581B2 (en) Rotation angle detector
US20120217959A1 (en) Electronic circuit, integrated circuit, and magnetic field detection device and electronic device including the same
JP2009268971A (en) Centrifugal separator
US7598735B2 (en) Device for detecting the position of a mobile target
JP2006234504A (en) Rotation detector
JP2008128721A (en) Pulse signal processing circuit of encoder, and motor control device
EP3136112A1 (en) Rotation sensor
JP2021148447A (en) Position detection device
JP2001201364A (en) Anomaly detecting circuit for magnetic encoder
JP2004154724A (en) Detector for rotation abnormality of rotor
JP2009103617A (en) Rotation detection sensor
EP3835190B1 (en) Position sensor and position detection method
JP5340235B2 (en) Sensor signal processing circuit
JP2008220002A (en) Overload detection method and detector of motor
JP2001330473A (en) Rotation sensor
JP2007071709A (en) Rotation state detector

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100316

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20111027

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20111108

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20111121

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141216

Year of fee payment: 3

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141216

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees