JP2009210570A5

JP2009210570A5 -

Info

Publication number: JP2009210570A5
Application number: JP2009024768A
Authority: JP
Filing date: 2009-02-05
Publication date: 2012-01-19
Anticipated expiration: 2029-02-05

Description

〔発明３〕
また、上記目的を達成するために、発明３の回転情報算出装置は、発明１又は発明２において、前記磁路部材の複数の磁路は、平板を円弧状に形成した複数の円弧部を、互いの周方向の端部の間に複数の空隙を設けて円環板状に配置することで構成され、前記複数の磁気検出器は、前記複数の円弧部の間に設けた前記空隙にそれぞれ配置されているとともに、前記磁石は、板厚方向の外周面及び内周面が回転方向に正弦波状に変化する三日月板状とした２つの着磁部材を互いの周方向端部を向かい合わせることで円環板状をなして構成され、前記磁石を前記円環板状に配置した前記複数の円弧板に回転軸方向に対向して配置し、前記２つの着磁部材の一方のＳ極に着磁された面が前記円弧板に対向し、前記２つの着磁部材の他方のＮ極に着磁された面が前記円弧板に対向するように配置されている。
このような構成であれば、板厚方向の外周面及び内周面が回転方向に正弦波状に変化する三日月板状の２つの着磁部材で磁石を構成しているので、磁気検出器を通る磁束の量が正弦波状に変化し、出力信号も正弦波状となる。 [Invention 3]
In order to achieve the above object, the rotation information calculation device of the invention 3 is the invention 1 or the invention 2, wherein the plurality of magnetic paths of the magnetic path member are a plurality of arc portions in which flat plates are formed in an arc shape. Each of the plurality of magnetic detectors is provided in each of the gaps provided between the plurality of arc portions. The magnet is arranged such that two magnetized members having a crescent plate shape in which the outer peripheral surface and the inner peripheral surface in the plate thickness direction change in a sine wave shape in the rotational direction face each other in the circumferential direction. The magnet is arranged to be opposed to the plurality of arc plates arranged in the annular plate shape in the rotational axis direction, and is arranged on one S pole of the two magnetized members. The magnetized surface faces the arc plate and is magnetized on the other N pole of the two magnetized members. Surface which is disposed so as to face the arc plate.
With such a configuration, the magnet is composed of two crescent-plate-shaped magnetized members whose outer peripheral surface and inner peripheral surface in the plate thickness direction change in a sine wave shape in the rotational direction, and therefore pass through the magnetic detector. The amount of magnetic flux changes in a sine wave shape, and the output signal also becomes a sine wave shape.

〔発明４〕
また、上記目的を達成するために、発明４の回転情報算出装置は、発明１又は発明２において、前記磁路部材の複数の磁路は、板厚方向に同一曲率で湾曲している複数の円弧部を、互いの周方向の端部の間に空隙を設けて円環筒状に配置することで構成され、前記複数の磁気検出器は、前記複数の円弧部の間に設けた前記空隙にそれぞれ配置されているとともに、前記磁石は、板厚方向に同一曲率で湾曲し、互いの周方向端部を向かい合わせることで円環筒状をなす２つの着磁部材で構成され、前記２つの着磁部材の回転軸方向を向く端面が回転方向に正弦波状に変化する面として形成され、前記磁石を円環筒状に配置した前記複数の円弧部の内径側に配置し、前記磁石を構成する前記２つの着磁部材の一方のＳ極に着磁された外周面が前記円弧部に対向し、前記２つの着磁部材の他方のＮ極に着磁された外周面が前記円弧部に対向するように配置した。
このような構成であれば、磁路部材の内径側に磁石が配置されたことで、回転情報算出
装置の回転軸方向のサイズが小さくなり、小型化が図られる。また、回転軸方向を向く端面を回転方向に正弦波状に変化する面として形成した２つの着磁部材で磁石を構成しているので、磁気検出器を通る磁束の量が正弦波状に変化し、出力信号も正弦波状となる。 [Invention 4]
In order to achieve the above object, the rotation information calculation device of the invention 4 is the invention 1 or the invention 2, wherein the plurality of magnetic paths of the magnetic path member are curved with the same curvature in the plate thickness direction. The arc portions are configured by providing a gap between the circumferential ends of the arc portions in an annular tube shape, and the plurality of magnetic detectors are provided between the arc portions. Each of the magnets is composed of two magnetized members that are curved with the same curvature in the thickness direction and have an annular cylindrical shape by facing each other in the circumferential direction. End surfaces facing the rotation axis direction of the two magnetized members are formed as surfaces that change in a sinusoidal shape in the rotation direction, the magnets are arranged on the inner diameter side of the plurality of arc portions arranged in an annular tube shape, and the magnets The outer peripheral surface magnetized to one S pole of the two magnetizing members constituting the Opposite the arc section, the two outer peripheral surface which is magnetized to the other N pole of the magnetized portion material is arranged to face the arcuate portion.
With such a configuration, rotation information is calculated by arranging a magnet on the inner diameter side of the magnetic path member.
The size of the apparatus in the direction of the rotation axis is reduced, and the size can be reduced. In addition, since the magnet is composed of two magnetized members formed as end surfaces facing the rotation axis direction as surfaces that change in a sine wave shape in the rotation direction, the amount of magnetic flux passing through the magnetic detector changes in a sine wave shape, The output signal is also sinusoidal.

〔発明５〕
また、上記目的を達成するために、発明５の回転情報算出装置は、発明１又は発明２において、前記磁路部材の複数の磁路は、板厚方向に同一曲率で湾曲している複数の円弧部を、互いの周方向の端部の間に空隙を設けて円環筒状に配置することで構成され、前記複数の磁気検出器は、前記複数の円弧部の間に設けた前記空隙にそれぞれ配置されているとともに、前記磁石は、円環筒体として円周方向の半分の領域がＳ極に着磁され、円周方向の残り半分の領域がＮ極に着磁された永久磁石であり、前記円環筒状に配置した前記複数の円弧部の内径側に対向して配置されている。
このような構成であれば、磁路部材の内径側に磁石が配置されたことで、回転情報算出装置の回転軸方向のサイズが小さくなり、小型化が図られる。 [Invention 5]
In order to achieve the above object, the rotation information calculation device of the invention 5 is the invention 1 or the invention 2, wherein the plurality of magnetic paths of the magnetic path member are curved with the same curvature in the plate thickness direction. The arc portions are configured by providing a gap between the circumferential ends of the arc portions in an annular tube shape, and the plurality of magnetic detectors are provided between the arc portions. Each of the magnets is a permanent magnet in which a half region in the circumferential direction is magnetized as an S pole and the other half region in the circumferential direction is magnetized as an N pole. It is arrange | positioned facing the internal diameter side of the said some circular arc part arrange | positioned at the said annular | circular shape cylinder shape.
With such a configuration, since the magnet is arranged on the inner diameter side of the magnetic path member, the size of the rotation information calculation device in the rotation axis direction is reduced, and the size can be reduced.

ここで、２つの着磁部材４２ａ，４２ｂの具体的な形状は、下式（４），（５）の通りで求められる。
着磁部材４２ａ，４２ｂの内周面の形状ＦIN＝r-（Ａcosθ/2）・・・（４）
着磁部材４２ａ，４２ｂの外周面の形状Ｆout＝r+（Ａcosθ/2）・・・（５）
ただし、θは絶対回転角度位置、rは磁石４２の中心半径、Ａは磁石４２の最大幅寸法である。 Here, the specific shapes of the two magnetized members 42a and 42b are obtained by the following equations (4) and (5).
Shape of inner peripheral surface of magnetized members 42a and 42b FIN = r− (Acos θ / 2) (4)
Shapes of outer peripheral surfaces of the magnetized members 42a and 42b Fout = r + (Acos θ / 2) (5)
However, theta is the absolute rotational angle position, r is the central radius of the magnet 42, A is the maximum width of the magnet 42.

ここで、２つの着磁部材４３ａ，４３ｂの軸方向の厚さＦAXの具体的な形状は、下式（６）の通りで求められる。
ＦAX＝Ａcosθ ・・・（６）
ただし、θは絶対回転角度位置、Ａは磁石４３の着磁面の最大幅寸法であり、着磁部材の厚さは軸方向の中心を基準に対称である。 Here, the specific shape of the axial thickness FAX of the two magnetized members 43a and 43b is obtained by the following equation (6).
FAX = Acosθ (6)
However, θ is the absolute rotation angle position, A is the maximum width dimension of the magnetized surface of the magnet 43, and the thickness of the magnetized member is symmetric with respect to the center in the axial direction.

Claims

A magnet holder supported by the rotor, a magnet supported by the magnet holder, and a signal corresponding to the input magnetic flux supported by the stator and arranged at predetermined intervals in the circumferential direction of the stator. A plurality of magnetic detectors that are supported by the stator and disposed between the plurality of magnetic detectors in a circumferential direction, and guide the magnetic flux from the magnet to the plurality of magnetic detectors. A magnetic path member having a path;
Based on the output signals of the plurality of phases from the plurality of magnetic detectors, the phase of which varies according to the positional relationship between each magnetic path of the magnetic path member and the magnet when the rotor rotates. A rotation information calculation device comprising: a rotation state calculation unit that calculates information indicating a rotation state.

A bearing in which a plurality of rolling elements are disposed between a stationary wheel and a rotating wheel, a magnet holder supported by the rotating wheel, a magnet supported by the magnet holder, supported by the stationary wheel, and A plurality of magnetic detectors arranged at predetermined intervals in the circumferential direction of the stationary ring and outputting signals corresponding to the input magnetic flux, and between the circumferential directions of the plurality of magnetic detectors supported by the stationary ring A magnetic path member having a plurality of magnetic paths for guiding magnetic flux from the magnet to the plurality of magnetic detectors,
Based on the output signals of the plurality of phases from the plurality of magnetic detectors, the phase of which varies according to the positional relationship between each magnetic path of the magnetic path member and the magnet when the rotating wheel rotates. A rotation information calculation device comprising: a rotation state calculation unit that calculates information indicating a rotation state.

The plurality of magnetic paths of the magnetic path member are configured by arranging a plurality of arc portions, each having a flat plate formed in an arc shape, in an annular plate shape by providing a plurality of gaps between end portions in the circumferential direction. The plurality of magnetic detectors are respectively disposed in the gaps provided between the plurality of arc portions,
The magnet has an annular plate shape by aligning two magnetized members having a crescent plate shape in which the outer peripheral surface and the inner peripheral surface in the plate thickness direction change in a sine wave shape in the rotation direction, facing each other in the circumferential direction. Composed of
The magnets are arranged in the circular plate arranged in the shape of the annular plate so as to face each other in the rotation axis direction, and the surface magnetized by one S pole of the two magnetized members faces the arc plate. The rotation information calculation device according to claim 1, wherein a surface magnetized by the other N pole of the two magnetized members is arranged to face the arc plate .

The plurality of magnetic paths of the magnetic path member are arranged in an annular tube shape by providing a plurality of arc portions that are curved with the same curvature in the thickness direction between the end portions in the circumferential direction. The plurality of magnetic detectors are respectively disposed in the gaps provided between the plurality of arc portions,
The magnet is composed of two magnetized members that are curved in the plate thickness direction with the same curvature and form an annular cylindrical shape by facing each other in the circumferential direction, and the rotational axis direction of the two magnetized members Is formed as a surface that changes sinusoidally in the direction of rotation,
The magnet is arranged on the inner diameter side of the plurality of arc portions arranged in an annular tube shape, and an outer peripheral surface magnetized on one S pole of the two magnetized members constituting the magnet is formed in the arc portion. The rotation information calculation device according to claim 1, wherein the rotation information calculation device is arranged so that an outer peripheral surface facing each other and the other N pole of the two magnetized members is opposed to the arc portion .

The plurality of magnetic paths of the magnetic path member are arranged in an annular tube shape by providing a plurality of arc portions that are curved with the same curvature in the thickness direction between the end portions in the circumferential direction. The plurality of magnetic detectors are respectively disposed in the gaps provided between the plurality of arc portions,
The magnet is a permanent magnet in which a half region in the circumferential direction is magnetized as an S pole and a remaining half region in the circumferential direction is magnetized as an N pole as an annular cylinder, The rotation information calculation device according to claim 1, wherein the rotation information calculation device is arranged so as to face an inner diameter side of the plurality of arc portions arranged on the surface.

A magnet supported by one of the stationary wheel and the rotating wheel, and a magnetic detection signal corresponding to the input magnetic flux from the magnet is arranged at a predetermined interval in the other circumferential direction of the stationary wheel and the rotating wheel. In a bearing device with a sensor having a plurality of magnetic detectors, a plurality of magnetic detection signals having different phases output from the plurality of magnetic detectors are input, and the rotating wheel is based on the input magnetic detection signals A rotation information calculation device for calculating information indicating the rotation state of
Sampling value acquisition means for acquiring a sampling value for the plurality of magnetic detection signals;
Rotation information calculation means for calculating information indicating the rotation state of the rotating wheel based on the sampling value;
A rotation information calculation device comprising: an abnormality detection unit configured to detect an abnormality in the plurality of magnetic detection signals based on the sampling value.

The anomaly detection means uses at least two calculation methods for each phase of the plurality of phases constituting the magnetic detector on the basis of sampling values of the plurality of magnetic detection signals having different phases. The rotation information calculation apparatus according to claim 6, wherein one rotation angle position is calculated, and abnormality of the plurality of magnetic detection signals is detected based on the calculated rotation angle position.

The rotation information calculation apparatus according to claim 7, wherein the abnormality detection unit detects an abnormality in the plurality of magnetic detection signals having different phases based on a difference value between the rotation angle positions with respect to each phase. .

The rotation information calculation means is the rotation angle position used for detecting the abnormality for each phase of the magnetic detection signal other than the magnetic detection signal in which the abnormality is detected by the abnormality detection means among the plurality of magnetic detection signals. The rotation information calculation device according to claim 7 or 8, wherein an average value of the rotation angle is calculated as a rotation angle position of the rotating wheel.

The rotation information calculation means, when an abnormality is detected in any one of the plurality of magnetic detection signals by the abnormality detection means, excludes the phase of the magnetic detection signal in which the abnormality is detected, 10. The rotation information calculation apparatus according to claim 6, wherein information indicating the rotation state is calculated based on a sampling value with respect to a phase magnetic detection signal.

11. The rotation information calculation apparatus according to claim 6, wherein the abnormality detection unit outputs an abnormality detection flag including information on the abnormality when the abnormality is detected.

The magnetic path member has three magnetic paths, the three magnetic detectors output signals corresponding to the input magnetic flux, and the three magnetic detectors have a phase of an electrical angle of 120 °. The rotation information calculation device according to claim 1, wherein the rotation information calculation device is arranged.

The three phases of the magnetic detector are A phase, B phase and C phase, and the sampling values of the magnetic detection signals corresponding to the A phase, B phase and C phase are a, b and c, respectively.
The abnormality detection means uses a different calculation method for each combination based on at least two combinations among the three combinations of the sampling values a and b, the sampling values a and c, and the sampling values b and c. Then, at least two rotation angle positions are calculated for each phase of the magnetic detector, and abnormalities of the three magnetic detection signals having different phases are detected based on the calculated rotation angle positions of the respective phases. The rotation information calculation device according to claim 12.

The magnetic path member has four magnetic paths, and two or four magnetic detectors output signals corresponding to the input magnetic flux, and the magnetic detector has a phase of an electrical angle of 90 °. The rotation information calculation device according to claim 1, wherein the rotation information calculation device is provided.

The rotation information calculation device according to claim 14, wherein the rotation information calculation means calculates rotation information from the two magnetic detectors.

15. The rotation information calculation device according to claim 14, wherein the rotation information calculation unit converts the differential outputs of the four magnetic detectors into a single end to calculate rotation information.

The rotation information calculation device according to any one of claims 14 to 16, wherein the rotation information calculation means calculates a rotation angle based on a ratio (arc tangent) of the magnetic detector.

The rotation information calculation apparatus according to any one of claims 1 to 17, wherein the magnetic detector is an analog Hall IC.

The rotation information calculation apparatus according to claim 18, wherein the analog Hall IC is a programmable Hall IC capable of correcting an output fluctuation accompanying a temperature change.

The rotation information calculation device according to claim 1, wherein the rotation information calculation unit outputs information indicating the rotation state as an analog signal.

The rotation information calculation device according to any one of claims 1 to 19, wherein the rotation information calculation unit outputs information indicating the rotation state as a digital signal.

The rotation information calculation device according to any one of claims 1 to 19, wherein the rotation information calculation means outputs information indicating the rotation state as a pulse signal.

The rotation information calculation unit calculates at least one of a relative rotation angle, an absolute rotation angle, a rotation angular velocity, and a rotation direction as information indicating the rotation state. The rotation information calculation device described in 1.

Rotation information such as the steering angle and rotation direction of the steering wheel is calculated by the rotation information calculation device according to any one of claims 1 to 23, and information such as the calculated steering angle and rotation direction is output. A steering apparatus characterized by the above.

The steering torque transmitted from the steering wheel to the steering shaft is calculated by a torque sensor equipped with the rotation information calculation device according to any one of claims 1 to 23, and based on the calculated steering torque, An electric power steering apparatus characterized in that an auxiliary torque is transmitted to the steering shaft.