A stator structure of an embodiment includes a stator core that comprises: a ring-shaped main body; and a plurality of teeth extending in a radial direction of the main body and arranged along a circumferential direction of the main body. The main body comprises a plurality of elongated holes that are formed in an arc shape along the circumferential direction of the main body and that are arranged along the circumferential direction of the main body, and a plurality of holes that are arranged along the circumferential direction of the main body between the teeth and the elongated holes in the radial direction of the main body. At least one of the holes is disposed between beams and the teeth located close to the beams, the beams being provided between the adjacent elongated holes.

A park lock assembly for a vehicle transmission includes a toothed park lock gear and a moveable locking pawl that is moveable between an engaged state, in which the locking pawl is in locking engagement with the park lock gear, and a disengaged state, in which the park lock gear is freely rotatable relative to the locking pawl. The park lock assembly also includes an inductive angular position sensor located on an axial side of the park lock gear and configured for detecting angular position of the park lock gear.

A rotational angle sensor includes a rotary plate and a printed circuit board in which a primary coil and a secondary coil group are arranged. Loops of the primary coil and the secondary coil group are along a surface of the printed circuit board. The rotary plate includes a target portion whose outer circumferential edge portion has a sine-wave shape. The primary coil overlaps with the target portion, and has a circular-arc shape along a rotational direction of the rotary plate. The secondary coil group includes 4n (n is a natural number) secondary coils arranged in a line along the rotational direction, on an inner circumferential side of the primary coil. The number of turns of a secondary coil on an end side in a line is smaller than that of a secondary coil on an inner side in the line.

A method of correcting a position reading from a position sensing arrangement. The position sensing arrangement is suitable for sensing the position of a revolute joint of an articulated structure, and comprises a disc having a magnetic ring with magnetic pole pairs and a magnetic sensor assembly comprising a magnetic sensor array for detecting the magnetic pole pairs of the magnetic ring. The method comprises: for each pole pair of the magnetic ring, taking a calibration pole pair position reading with the magnetic sensor array, and generating a pole pair correcting function by comparing the calibration pole pair position reading with a model pole pair position reading; averaging the pole pair correcting functions of the pole pairs of the magnetic ring to generate an average pole pair correcting function for the magnetic ring; taking a position reading with the magnetic sensor array, the position reading comprising a plurality of pole pair position readings; and generating a corrected position reading by deducting the average pole pair correcting function from each pole pair position reading.

Methods, apparatus, systems, and computer program products for estimating error in an electric motor position sensor are disclosed. In a particular embodiment, an electronic control unit (ECU) for an electric motor receives, during a first state of operation of the electric motor, a first plurality of time samples of a first output signal from a position sensor, the first output signal indicative of a rotational position of the electric motor during the first state. The embodiment includes determining a first magnitude value for each of the first plurality of time samples of the first output signal, determining a first magnitude ripple value based upon the plurality of first magnitude values, and determining a first absolute angle error based on the first magnitude ripple value. The embodiment further includes determining an estimated error offset based on the first absolute angle error and storing the estimated error offset in a memory.

A radial inductive position sensor, high-resolution position sensor system and a torque sensor system for detecting a rotational movement are disclosed. The radial inductive position sensor includes at least one transmitter coil, at least one receiver coil pair with a first receiver coil and a second receiver coil, and a moving conductive target, which is connected or connectable to a rotating shaft, wherein the at least one transmitter coil and the at least one receiver coil pair are arranged on a substrate, wherein the substrate has a radial configuration for at least partially surrounding the moving conductive target and/or the rotating shaft.

An apparatus for sensing a position of a target, in particular for offset invariant sensing of the position of the target, is described as well as a corresponding method. The apparatus comprises at least three sensor elements. At least one sensor element of the at least three sensor elements generates a first magnetic field. At least two sensor elements of the at least three sensor elements receive a second magnetic field associated with the first magnetic field. The at least two sensor elements of the at least three sensor elements form at least one sensor element pair and provide a signal indicative of the position of the target.

A redundant angular position sensor comprising a first angular position sensor including a first excitation coil, a first sensing coil and a second sensing coil and a second angular position sensor. The second angular position sensor including a second excitation coil, a third sensing coil and a fourth sensing coil. Each of the first, second, third and fourth sensing coils comprising a respective clockwise winding portion and a respective counter-clockwise winding portion. The redundant angular position sensor further comprises a rotatable inductive coupling element positioned in overlying relation to the sensing coils and separated from the sensing coils by a gap, wherein the rotatable inductive coupling element comprises four, substantially evenly radially spaced, sector apertures.

A scanning probe for a coordinate measuring machine with inductive position sensor signal gain control is provided. The scanning probe includes a stylus position detection portion with field generating and sensing coils, and for which corresponding output signals are indicative of a position of the probe tip of the stylus. Signal processing and control circuitry is configured to implement different operating regions, such as a central high gain operating region which corresponds to a central probe tip position range, as well as other lower gain operating regions, and for which transition operations may be performed for adjusting the gain. In various implementations, transition operations for adjusting a gain may include operations such as: adjusting power to a field generating coil configuration; adjusting a gain of a front end amplifier; altering characteristics of sensing coils; adjusting an input range of an analog to digital converter, etc.

An improved inductive sensor determines angular positions for rotating objects, such as rotors of synchronous electric motors. The inductive sensor includes an arcuate transmitter coil, one or more receiver coils, and a conductive target configured to rotate with the rotating object, relative to the transmitter coil and the receiver coil(s). The conductive target includes a plurality of lobes and individual of the lobes is split into multiple lobe portions.