Abstract: A position detection device, configured to detect a position of a shaft that moves forward and backward in an axial direction, is provided with an excitation coil that generates an alternating magnetic field; a target which is fixed to the shaft and in which a magnetic flux of the alternating magnetic field is interlinked; and a detection coil in which the magnetic flux of the alternating magnetic field is interlinked, wherein the detection coil has a first portion and a second portion, where an induced voltage is generated by the magnetic flux of the alternating magnetic field being interlinked, and a connecting path connecting the first portion and the second portion. The first portion and the second portion respectively extend along the axial direction and the coil longitudinal direction parallel to the axial direction and at least a portion of each is aligned in an alignment direction perpendicular to the axial direction.

Abstract: A position detection device for detecting a position of a shaft moving forward and backward in an axial direction is provided with a detection object mounted on the shaft, a substrate disposed to face the detection object, an excitation coil that is mounted on the substrate and generates an AC magnetic field, a detection coil that is mounted on the substrate and arranged along the axial direction of the shaft and configured so that a magnitude of a voltage induced varies with a position of the detection object, and a sensor for detecting a physical quantity used to correct the position of the shaft by using a sensor coil configured by the excitation coil, the detection coil, or an other coil provided on the substrate.

Abstract: A torque sensor to detect torque transmitted by a shaft having magnetostrictive properties is provided with a pair of cylindrical detection units arranged around the shaft and aligned side-by-side in an axial direction of the shaft, and first and second connection lines connecting the pair of detection units. Each detection unit includes first to fourth detection coils stacked in a radial direction. A series circuit formed by series connecting the first and fourth detection coils is parallel connected to a series circuit formed by series connecting the second and third detection coils. The first and second connection lines are configured to connect between corresponding connecting portions of the first and fourth detection coils and between corresponding connecting portions of the second and third detections coils, respectively. The torque transmitted by the shaft is detected based on a potential difference between the first connection line and the second connection line.

Abstract: A torque measuring device includes a bridge circuit in which four detection coils arranged around a magnetostrictive effect section of a rotating shaft are arranged on four sides; and the bridge circuit includes a resistance element connected to at least one of the four sides for adjusting a resistance value of the side.

Abstract: A torque measuring device includes: a coil unit having a detection coil configured to change a voltage in response to a change in magnetic permeability of a magnetostrictive effect section of a rotating shaft; a back yoke arranged coaxially around the coil unit; a holder configured to hold the coil unit and the back yoke; and an electronic circuit including the detection coil and configured to generate an output voltage according to a voltage of the detection coil, a clearance in a radial direction is provided between an outer peripheral surface of the coil unit and an inner peripheral surface of the back yoke, and a range of change in the clearance that accompanies temperature change during use is regulated to a range in which a change in the output voltage is linear with respect to the change in the clearance.

Abstract: The manufacturing method includes: performing testing of samples having the same configuration as the torque measuring device to be manufactured to find a coil balance Cb that is a ratio (R1×R3)/(R2×R4) of a product R1×R3 of resistance values R1 and R3 of one pair of opposite sides of the four sides of a bridge circuit 8, and a product R2×R4 of resistance values R2 and R4 of another pair of opposite sides of the four sides, and a temperature change rate VT of output voltage Vo of a sensor portion 4, and acquiring a relationship X between the coil balance Cb and the temperature change rate VT from the test results; and measuring the resistance values R1, R2, R3, R4 of the four sides to find the coil balance Cb to find the temperature change rate VT from the relationship X for the torque measuring device to be manufactured.

Abstract: A torque sensor to detect torque transmitted by a shaft having magnetostrictive properties is provided with a pair of cylindrical detection units arranged around the shaft and aligned side-by-side in an axial direction of the shaft, and first and second connection lines connecting the pair of detection units. Each detection unit includes first to fourth detection coils stacked in a radial direction. A series circuit formed by series connecting the first and fourth detection coils is parallel connected to a series circuit formed by series connecting the second and third detection coils. The first and second connection lines are configured to connect between corresponding connecting portions of the first and fourth detection coils and between corresponding connecting portions of the second and third detections coils, respectively. The torque transmitted by the shaft is detected based on a potential difference between the first connection line and the second connection line.

Abstract: A current sensor includes a bus bar in which a current to be detected flows, a circuit board mounted with a magnetic detection element thereon to detect a strength of a magnetic field generated by a current flowing in the bus bar, and a housing including first and second housings provided in such a manner as to sandwich the bus bar and the circuit board therebetween in a plate thickness direction of the bus bar. The first and second housings include slide guide portions respectively which are relatively slidable in a sloping direction with respect to the plate thickness direction of the bus bar while abutting each other in the plate thickness direction of the bus bar.

Abstract: A current detection method for a current detection device including magnetism detection elements that detect magnetic flux density and output a voltage signal corresponding to the magnetic flux density is provided. The method includes acquiring measured value data that is obtained as a result of providing magnetic flux density in a detectable range of the magnetism detection elements that indicates the relationship between the magnetic flux density and an output voltage signal from the current detection device. Next, computational processing is performed so as to fit the acquired measured value data to a formula that includes plural factors and indicates the output voltage of the magnetism detection elements, thereby calculating the plural factors, and correcting the output voltage signal from the magnetism detection elements in accordance with the calculated factors so as to be approximately linear with respect to the magnetic flux density.

Abstract: A current sensor includes three bus bars arranged in such a manner to be spaced and aligned in a width direction thereof. A first shield plate and a second shield plate, which are made of a magnetic material, are arranged in such a manner to sandwich the three bus bars therebetween together in a thickness direction perpendicular to the width direction. Three magnetic detection elements are arranged between the three bus bars respectively and the first shield plate to detect a magnetic field strength generated by currents flowing through the corresponding bus bars. A conductive plate is disposed between each of the magnetic detection elements and the first shield plate. The conductive plate is disposed in such a manner to sandwich the three bus bars together between the conductive plate and the second shield plate. The conductive plate is made of a nonmagnetic conductive material.

Abstract: A current sensor includes first and second bus bars aligned and arranged in such a manner to be spaced from each other in a plate width direction, a third bus bar arranged in such a manner that a plate thickness direction thereof coincides with a plate thickness direction of the first and second bus bars and a length direction thereof is orthogonal to a length direction of the first and second bus bars, first and second magnetic detection elements arranged opposite the first and second bus bars respectively in the plate thickness direction, and a third magnetic detection element arranged opposite the third bus bar in the plate thickness direction. The first and second magnetic detection elements are gradient detection type magnetic detection elements and are arranged in such a manner that a detection axis direction thereof is perpendicular to the length direction of the first and second bus bars and is tilted with respect to the plate thickness direction of the first and second bus bars.

Abstract: A current sensor includes a bus bar through which a measured current is carried, a pair of shielding plates that include a magnetic material, and are arranged to sandwich the bus bar in a thickness direction of the bus bar, and a magnetic detection element that is arranged between the bus bar and one of the shielding plates, and detects an intensity of magnetic field caused by the current carried through the bus bar. The shielding plate has a length of not less than 20 mm in a length direction of the bus bar, and a width of not less than 24 mm and not more than 38 mm in a width direction orthogonal to the length direction.

Abstract: An electric current sensor includes bus bars, each of which has a plate shape and flows an electric current to be detected in a length direction, a housing for holding the bus bars with being aligned in a width direction perpendicular to the length direction and a thickness direction of the bus bars, magnetic detection elements, each magnetic detection element detecting a strength of magnetic field generated by the electric current flowing through a corresponding bus bar, and a substrate on which the magnetic detection elements are mounted. The substrate is arranged to sandwich the bus bars between the housing and the substrate, and the substrate is fixed to the housing. A fixing portion for fixing the substrate to the housing is provided at both ends of the substrate in the width direction and at least one location between the magnetic detection elements adjacent to each other in the width direction.

Abstract: An electric current sensor includes bus bars each having a plate shape through which an electric current to be detected flows in a length direction, a housing including a bus bar-holding portion for holding the bus bars with being aligned in a width direction perpendicular to the length direction and a thickness direction of the bus bars, magnetic detection elements, each of which detects a strength of magnetic field generated by the electric current flowing through a corresponding bus bar, and a first shield plate and a second shield plate arranged to sandwich the respective bus bars and the magnetic detection elements in the thickness direction. Each of the first shield plate and the second shield plate is made of a magnetic material. Both the first shield plate and the second shield plate are held directly and commonly by the housing.

Abstract: A current sensor includes plural bus bars which are each formed rectangular in a cross section, a pair of shield plates that include a magnetic material and are arranged so as to collectively sandwich the plural bus bars therebetween, and plural magnetic detection elements that are each arranged between the bus bars and one of the shield plates. A distance d between a detection position of a magnetic field intensity at an arbitrary one of the magnetic detection elements and a center position in the width direction between one of the bus bars corresponding to the arbitrary magnetic detection element and an other of the bus bars adjacent thereto in the width direction satisfies the following expression: d/w+0.023(w/h)?0.36 where a width of the shield plates is w and an interval along a height direction of the shield plates is h.

Abstract: An electric current sensor includes first, second, and third current sensor modules, each including at least one bus bar formed in a rectangular shape extending in a width direction in cross section, to carry an electric current along a length direction perpendicular to the width direction, one pair of shield plates made of a magnetic material and disposed in a height direction perpendicular to the width direction and the length direction in such a manner as to sandwich the at least one bus bar therebetween, and at least one magnetic detection element disposed between the at least one bus bar and one of the one pair of shield plates, to detect a strength of a magnetic field in the width direction. The first, the second, and the third current sensor modules are arranged by superposition on top of each other in the height direction.

Abstract: A current sensor includes two bus bars, each of which is formed in a plate shape, the two bus bars being aligned and arranged so as to be spaced apart from each other in a plate width direction thereof, and magnetic detection element arranged opposite the two bus bars, respectively, in a plate thickness direction of the bus bars to detect a magnetic field strength generated by a current flowing through the corresponding bus bars. The magnetic detection element are gradient detection type magnetic detection elements that output a difference between magnetic field strengths detected at two magnetic sensing positions, respectively, and are arranged in such a manner that a detection axis direction thereof is perpendicular to a length direction of the bus bars and is tilted with respect to the plate thickness direction.

Abstract: An electric current sensor includes a plate-like shape bus bar, through which an electric current to be detected is to be passed, one pair of shield plates, which are made of a magnetic material and disposed in such a manner as to sandwich the bus bar between the one pair of the shield plates in a thickness direction of the bus bar, a magnetic detection element, which is disposed between the bus bar and one of the shield plates to detect a strength of a magnetic field to be produced by the electric current to be passed through the bus bar, a core, which is made of a magnetic material and disposed between the one pair of the shield plates, and a winding, which includes one part wound around the core, and an other part wound around either of the shield plates.

Abstract: An electric current detection device includes magnetism detector elements for detecting a strength of a magnetic field generated by an electric current flowing through an electric current path, a detection circuit for detecting a magnitude of an electric current flowing through the electric current path based on an output of the magnetism detector elements, and plural wires that are connected to the magnetism detector elements and extend in a direction away from the electric current path. The magnetism detector elements are arranged such that a direction of a magneto-sensitive axis thereof lies on a first plane parallel to a current-carrying direction of the electric current path and parallel to an extending direction of the plurality of wires. The plural wires are arranged on a same plane of a second plane orthogonal to the first plane.

Abstract: A current sensor includes a bus bar through which an electric current to be measured flows, a first magnetic sensing element including a first magneto-sensitive portion including a magneto-resistive element, and a second magnetic sensing element including a second magneto-sensitive portion including a magneto-resistive element. Strength of a magnetic field generated by the electric current sensed by the first magneto-sensitive portion is different from a strength of the magnetic field sensed by the second magneto-sensitive portion. A first bias magnetic field is applied to the first magneto-sensitive portion and a second bias magnetic field in a direction opposite to a direction of the first bias magnetic field is applied to the second magneto-sensitive portion.