A position measuring apparatus measures the position(s) of an electrically conductive measurement object which can be moved over a measurement section, along which coils are positioned. A measuring coil is provided between every two excitation coils, through each of which excitation coils an alternating excitation current flows, which current is predefined to be in phase opposition from excitation coil to excitation coil. The alternating magnetic fields produced by the alternating excitation currents induce eddy currents in the electrically conductive measurement object when the measurement object moves past the excitation coils. The measuring coils provide an AC measurement voltage which is induced by the eddy currents flowing in the measurement object when the measurement object moves past the at least one measuring coil. The position of the measurement object is determined on the basis of the at least one AC measurement voltage.

A position sensor, wherein the position sensor detects the movement of a target relative to a sine receiver coil and a cosine receiver coil and generates a corresponding sine signal and a corresponding cosine signal, and a method for error detection of a position sensor.

The disclosure makes it possible to detect a position of an electromagnetic induction pen in a shorter time than in the past. A position detection device includes a plurality of loop coils arranged side by side in an x-direction, and a sensor controller that detects an amplitude of an alternating current signal generated in each of the plurality of loop coils, while supplying an alternating current signal to each of the plurality of loop coils, and detects a position of an electromagnetic induction pen in the x-direction based on the amplitude of the alternating current signal detected in each of the plurality of loop coils.

An apparatus comprising: a support structure; and a first electrically-conductive material arranged at the support structure to define a first continuous path for first electrical current to flow between a first location and a second location, the first continuous path comprising: a first path portion defining a first generally-clockwise path for the first electrical current to flow around a first axis, the first path portion including a first inner-circumferential portion and a first outer-circumferential portion, the first inner-circumferential portion located closer to a central axis than the first outer-circumferential portion, a radius of curvature of the first inner-circumferential portion being greater than a radius of curvature of the first outer-circumferential portion; and a second path portion defining a first generally-counter-clockwise path for the first electrical current to flow around a second axis, the first path portion and the second path portion circumferentially arranged around the central axis. Related devices, systems and methods are also disclosed.