An inductive angle sensor for determining a rotational position of a rotor relative to a stator includes an exciter coil, at least one pickup coil arrangement having an m-fold symmetry and at least one conductive target having an m-fold symmetry. The exciter coil may excite the conductive target which, in turn, may induce an induced signal in the pickup coil arrangement. A signal analysis device may determine the rotational position of the rotor based on the induced signal. The inductive angle sensor may comprise a second pickup coil arrangement having an n-fold symmetry and a second conductive target having an n-fold symmetry. The exciter coil may excite the second conductive target which, in turn, may induce a second induced signal in the second pickup coil arrangement. The signal analysis device may determine the rotational position of the rotor based on the two induced signals according to a Vernier principle.

An inductive angle sensor for determining a rotational position of a rotor relative to a stator includes an exciter coil, at least one pickup coil arrangement having an m-fold symmetry and at least one conductive target having an m-fold symmetry. The exciter coil may excite the conductive target which, in turn, may induce an induced signal in the pickup coil arrangement. A signal analysis device may determine the rotational position of the rotor based on the induced signal. The inductive angle sensor may comprise a second pickup coil arrangement having an n-fold symmetry and a second conductive target having an n-fold symmetry. The exciter coil may excite the second conductive target which, in turn, may induce a second induced signal in the second pickup coil arrangement. The signal analysis device may determine the rotational position of the rotor based on the two induced signals according to a Vernier principle.

A high-precision turning device. The device has a base plate, a base, a support A, wherein a groove is formed in the center of the bottom surface of the base, and a lead screw passes through the groove; symmetrical T-shaped annular grooves are formed in two sides of the interior of the base, two symmetrical T-shaped annular columns are arranged on the lower end face of a turning block, and the T-shaped annular columns can be inserted into the T-shaped annular grooves; and the structure of a central position of the lower end face of the turning block is annular teeth, and the annular teeth are meshed with the lead screw. A servomotor drives the lead screw to rotate, and by virtue of meshing matching of the annular teeth and the lead screw, the turning block can turn along the centers of the T-shaped annular grooves in the base.

A high-precision turning device. The device has a base plate, a base, a support A, wherein a groove is formed in the center of the bottom surface of the base, and a lead screw passes through the groove; symmetrical T-shaped annular grooves are formed in two sides of the interior of the base, two symmetrical T-shaped annular columns are arranged on the lower end face of a turning block, and the T-shaped annular columns can be inserted into the T-shaped annular grooves; and the structure of a central position of the lower end face of the turning block is annular teeth, and the annular teeth are meshed with the lead screw. A servomotor drives the lead screw to rotate, and by virtue of meshing matching of the annular teeth and the lead screw, the turning block can turn along the centers of the T-shaped annular grooves in the base.

A stroke sensor includes: a shaft that extends in an axial line direction; a detected body that is fixed to the shaft; a housing that extends along the shaft, that houses the shaft, and that supports the shaft slidably in the axial line direction; and a detection body that detects a movement amount of the detected body which moves in accordance with sliding of the shaft, wherein the shaft includes a plurality of shaft members that are connected to each other in the axial line direction and that are formed of metal, and a slide part that is in contact with an inner wall of the housing and that slides so as to regulate a movement of the shaft in a direction that is crossed with the axial line is provided on each of the plurality of shaft members.

A stroke sensor includes: a shaft that extends in an axial line direction; a detected body that is fixed to the shaft; a housing that extends along the shaft, that houses the shaft, and that supports the shaft slidably in the axial line direction; and a detection body that detects a movement amount of the detected body which moves in accordance with sliding of the shaft, wherein the shaft includes a plurality of shaft members that are connected to each other in the axial line direction and that are formed of metal, and a slide part that is in contact with an inner wall of the housing and that slides so as to regulate a movement of the shaft in a direction that is crossed with the axial line is provided on each of the plurality of shaft members.

Disclosed are angle sensing devices and gimbal platforms adopting the same. One angle sensing device disclosed herein comprises: a rear cover provided with an upper fitting face; a bracket provided with a lower fitting face, the lower and upper fitting faces being arranged to face each other and spaced apart from each other by a pre-set spacing; and a sensor mounting plate for mounting an angle sensor; wherein the sensor mounting plate is provided between the upper and lower fitting faces, and the pre-set spacing is greater than the thickness of the sensor mounting plate, such that the sensor mounting plate is movable between the upper and lower fitting faces.

Disclosed are angle sensing devices and gimbal platforms adopting the same. One angle sensing device disclosed herein comprises: a rear cover provided with an upper fitting face; a bracket provided with a lower fitting face, the lower and upper fitting faces being arranged to face each other and spaced apart from each other by a pre-set spacing; and a sensor mounting plate for mounting an angle sensor; wherein the sensor mounting plate is provided between the upper and lower fitting faces, and the pre-set spacing is greater than the thickness of the sensor mounting plate, such that the sensor mounting plate is movable between the upper and lower fitting faces.

Head-mounted augmented reality (AR) devices can track pose of a wearer's head to provide a three-dimensional virtual representation of objects in the wearer's environment. An electromagnetic (EM) tracking system can track head or body pose. A handheld user input device can include an EM emitter that generates an EM field, and the head-mounted AR device can include an EM sensor that senses the EM field. EM information from the sensor can be analyzed to determine location and/or orientation of the sensor and thereby the wearer's pose. An improved or optimized pose can be provided by reverse-estimating a reverse EM measurement matrix and optimizing the pose based on a comparison between the reverse EM measurement matrix and an EM measurement matrix measured by the EM sensor.

One or more examples relate, generally, to reducing error in estimated angular position of a rotor of a motor.