A sensor system having a permanent magnet for a sensor for determining a relative angular position (?(t)), whose magnetization vector (M(P)) at a point (P) presents, in orthogonal projection on a plane perpendicular to its main axis (A), a projected vector whose relative orientation (?rp(?(P))) with respect to the particular radial segment (SRP) at this point (P) is a continuously variable function of the angular position (?(P)) of the point (P), periodic function having an even integer (Np) greater than or equal to 2 of angular periods (T) over the 360? about the main axis (A), with a positive variation of the relative orientation (?rp(?(P))) as a function of a positive variation of the angular position (?(P)) of the point (P); a method implementing such a sensor system; and a method for manufacturing a magnetized body.

The invention relates to a sensor device and method for detecting measurement data relating to the absolute position of a linearly or rotationally moveable body, comprising an optical sensor system, wherein the optical sensor system uses exclusively zero-order rejections for the position measuring, and a magnetic sensor system which emits a second sensor output signal depending on the position to be determined of the moveable body, wherein the gauge of the optical sensor system and the gauge of the magnetic sensor system are integrated in a common gauge body, and a computer unit which is provided to obtain the first sensor output signal and the second sensor output signal and to generate a common sensor output signal from the first sensor output signal and the second sensor output signal, wherein the current period of the second sensor system can be deduced from the first sensor output signal at every time, in order to calculate clear absolute position information based on the first and second sensor output signal.

An electromechanical actuator includes a ground arm, an output arm rotatable about an axis of rotation relative to the ground arm and a position sensing arrangement to determine an angular position of the output arm relative to the ground arm. The position sensing arrangement includes a position sensor fixed at the ground arm. The position sensor is configured to sense magnetic reluctance. A sensed portion is located at the output arm proximate to the position sensor. The sensed portion includes a geometric variation in an output arm surface configured to vary a magnetic reluctance sensed at the position sensor as a function of angular position of the output arm relative to the ground arm.

Provided is a linear motion and rotation drive apparatus capable of minimizing inertia due to a magnetic scale attached to an output shaft when the output shaft is linearly moved or rotate. A linear motion and rotation drive apparatus (1) includes an output shaft (2), a linear motor (3), a rotational motor (4), a ball spline bearing (5), a magnetic scale (8), a first magnetic detection element (41) configured to detect a linear motion, and a second magnetic detection element (42) configured to detect a rotational motion. The magnetic scale (8) includes a lattice-shaped magnetized pattern (37) in which S poles and N poles are alternately arranged in an axis L direction and S poles and N poles are alternately magnetized in a direction around the axis (L) on a circumferential surface thereof in the direction around an axis (L). The first magnetic detection element (41) and the second magnetic detection element (42) are disposed to face the magnetized pattern (37). Since a linear motion position and a rotating position can be detected using the first magnetic detection element (41) and the second magnetic detection element (42) that face the same magnetized pattern (37), a size of a linear motion and rotation detector (7) in the axis L direction is not increased and a weight thereof is not increased.

Provided is a method for a magnetic encoder having a magnetic body comprised of a magnetic rubber molded article, comprising a mixing step of mixing and then kneading a nitrile rubber (A), a ferrite magnetic powder (B) and a vulcanizing agent (C) to provide a magnetic rubber composition; and a molding step of molding and vulcanizing the magnetic rubber composition in a mold to which a magnetic field is applied to provide the magnetic rubber molded article, wherein a content of the ferrite magnetic powder (B) is 700 to 1500 parts by mass based on 100 parts by mass of the nitrile rubber (A); and a compressed density of the ferrite magnetic powder (B) is 3.5 g/cm.sup.3 or more. According to this method, a magnetic encoder having a magnetic body with high coercivity and residual magnetic flux density can be produced by vulcanizing a magnetic rubber composition having favorable moldability.

The invention relates to a belt retractor comprising a signal transmitter ring (6) for a magnetic sensor (34). comprising a hub (14) which is connected to the belt reel in a rotationally fixed manner and comprising a signal transmitter portion (20) exhibiting periodically varying material properties when viewed in the circumferential direction, wherein the signal transmitter portion includes a stop (30) by which it abuts against a contact surface (32) associated therewith, and comprising a spring portion (18) acting on the signal transmitter portion relative to the hub so that the stop abuts against the contact surface.

A sensor ring is provided for a magnetic measuring transducer of an ABS system consisting of at least two annularly arranged functional elements. The first functional element is formed as a ferromagnetic annular disc element with a flat upper side and a flat underside with a multiplicity of openings. The second functional element, as a non-ferromagnetic element, has either been applied on the upper side and/or the underside of the annular disc element and/or has been introduced into the openings, as an annular disc element. The sensor ring is protected from contamination or damage by the non-ferromagnetic covering. The covering may also be produced by encapsulation or filling, wherein the openings in the sensor ring can be filled with plastic and also the side faces can be coated with plastic.

A magnetic position detection device includes two magnetic scales 1a, 1b on which N and S magnetic poles are disposed alternately, magnetism sensing element groups 2a, 2b for measuring variation in magnetic fields formed respectively by the magnetic scales 1a, 1b, and a position calculation device 3 for calculating absolute positions of magnetism sensing elements 21 on the magnetic scales 1a, 1b from output values output by the magnetism sensing elements 21, wherein a difference between the respective numbers of magnetic poles on the magnetic scales 1a, 1b is 2, and the magnetism sensing elements 21 are disposed such that arrangement intervals between the magnetism sensing elements 21 of the respective magnetism sensing element groups 2a, 2b each take a value obtained by dividing a length of one magnetic pole equally by the number of magnetism sensing elements 21.

A magnetic sensor arrangement, comprising: a magnet assembly and a magnetic sensor; the magnet assembly forming a magnetic field having at least two magnetic field components with different angular periodicities at the location of the magnetic sensor and the magnetic sensor including means for sensing the different magnetic field components to produce at least a first and a second sensor element signal; and a computing element for receiving the at least first and second sensor element signals and combining them to produce a unique angular position of the magnet relative to the sensor. A method of determining a unique angular position is also provided.

A molded article 1 is configured such that an insert 2 is made of a steel plate and includes a cylindrical part 2A and an annular part 2B, a plastic 4 is annular in shape so as to be joined to the annular part 2B, inner diameter D1 of the plastic 4 is larger than inner diameter D2 of the annular part 2B so that no burrs at a gate mark E protrude to the inner diameter side of the molded article 1, the injection molding is conducted with a disc gate arranged on an inner peripheral surface F of the plastic 4 at a position separated from a surface of the annular part 2B, and the gate mark E resides on the inner peripheral surface F of the plastic 4 at a position separated from the surface of the annular part 2B.