A rotation angle detection device includes a first detection unit, a second detection unit, and a calculation unit. The first detection unit detects a first rotation angle of a steering shaft that rotates with a steering wheel. The second detection unit detects a second rotation angle of a motor shaft coupled to the steering shaft via a speed reduction mechanism. The calculation unit receives the first rotation angle from the first detection unit and the second rotation angle from the second detection unit, and calculates the steering angle of the steering shaft based on a difference angle between the first rotation angle and the second rotation angle.

A fail operational steering angle sensor for vehicles is provided. The fail operational Steering Angle Sensor comprises one central gear (hub) and two outer gears (Gear 1 and Gear 2) mechanically connected to the hub. The two outer gears have magnetic properties, and they are arranged in the vicinity of a Printed Circuit Board (PCB). The SAS Fail Operational is connected to a Steering Wheel Actuator shaft that, by means of a mechanical connection with the central gear, the two outer gears and a rotor arranged between the central gear and the PCB, provides angular rotation to the above-mentioned moving parts. The variations of the magnetic field and flux originated in the rotation of the mechanical parts will be determined by the PCB.

To suppress deterioration in the detection accuracy of a rotation angle of a magnet even when a member located in the vicinity of the magnet is made of a magnetic material. An absolute encoder includes a first sub-shaft gear configured to rotate based on rotation of a main shaft, a bearing part configured to rotatably support the first sub-shaft gear around an axial line A, a support shaft configured to support the bearing part, and a spacer provided between the first sub-shaft gear and the bearing part. At least a part of the spacer is formed of a magnetic material, and the spacer is formed extending in a direction intersecting the axial line A.

An absolute encoder includes a spindle gear fixed to a motor shaft, a permanent magnet provided on the spindle gear, and a first driven gear having a center axis perpendicular to a center axis of a worm gear portion, and engaging the worm gear portion. The absolute encoder includes a second driving gear provided coaxially with the first driven gear and rotating according to a rotation of the first driven gear, and a second driven gear having a center axis perpendicular to the center axis of the first driven gear, and engaging the second driven gear. The spindle gear includes a magnet holder which is fit onto a tip end of the motor shaft, coaxially with the motor shaft, and a resin gear portion provided with the worm gear portion on an outer side in a radial direction.

The present disclosure relates to a component having a main body that is provided with a coating, wherein the coating has a plurality of coating segments which extend about an axis of rotation of the component extending in the circumferential direction of the component and at least partially spaced apart from one another, by means of which coating segments a rotational speed of the component rotating about the axis of rotation can be detected.