A motor-driven machine tool unit having a stator unit and at least one rotor unit having a rotor shaft that is rotatable about an axis of rotation. The rotor unit includes at least one first bearing unit arranged in the end region of a tool and/or workpiece receptacle, and a second bearing unit arranged at the opposite end region for mounting the rotor shaft in the stator unit. At least one electrical power transmission unit for transmitting electrical power between the stator unit and the rotor unit is provided. The problem addressed by the invention is that of better satisfying the increasing demands on modern machine tools or machine tool units. This problem is solved by the electrical power transmission unit is arranged in the end region opposite the tool and/or workpiece holder and/or on the second bearing unit.

A sensor includes a ferromagnetic shield, at least one sensor coil disposed around an exterior of the ferromagnetic shield, and an electronics module within the ferromagnetic shield. The electronics module is configured to determine the position and/or orientation of the sensor based at least in part on a measurement of a signal induced in the at least one sensor coil.

An absolute electromagnetic position encoder comprises a readhead and an absolute scale. The readhead comprises a spatially modulated signal coupling configuration and a readhead processor. The absolute scale comprises a passive signal pattern, an active signal pattern and a timing and activation circuit connected to the active signal pattern. During a first signal generating cycle, the readhead processor is configured to provide first cycle spatially periodic signals and the timing and activation circuit is configured to receive and store energy. During a second signal generating cycle, the timing and activation circuit is configured to drive the active signal pattern and the readhead processor is configured to provide at least one corresponding second cycle signal. The readhead processor is configured to determine an absolute position of the readhead relative to the absolute scale based on at least the second cycle signal and the first cycle spatially periodic signals.

An absolute electromagnetic position encoder comprises a readhead and an absolute scale. The readhead comprises field generation and detection configuration and a readhead processor. The absolute scale comprises an active periodic signal pattern, an active absolute signal pattern, and timing and activation circuitry connected to the active signal pattern. During an energy transfer cycle, the timing and activation circuitry is configured to receive and store energy from the readhead. During a first signal generating cycle, the timing and activation circuitry is configured to drive the periodic spatially modulated signal generating element in order to generate first cycle spatially periodic signals in the first cycle field detector. During a second signal generating cycle, the timing and activation circuitry is configured to drive the first spatially modulated signal generating element in order to provide at least one corresponding second cycle signal in the readhead. The readhead processor is configured to determine an absolute position of the readhead relative to the absolute scale based on at least the second cycle signal and the first cycle spatially periodic signals.

The present invention relates to providing an electrical voltage for exciting an excitation coil of a resolver (2). In this case, the electrical voltage for exciting the excitation coil of the resolver (2) can be generated by means of pulse-width-modulated driving of at least one half-bridge (H1). In this case, the switching elements of the half-bridge (H1) are fully turned on, with the result that losses such as occur during linear operation of semiconductor switches, for example, can be avoided. If appropriate, the voltage (U_e) provided by the half-bridge (H1) can be additionally increased by means of suitable resonant circuits (L1, C1, C3 . . . ).

Inductive position sensor system for high-speed motors, without said sensor system comprising magnets, brushes or magnetic shields, the sensor system comprising a sensor which comprises an inductor coil and a passive coil, the inductor coil inducing voltage in the passive coil, and an electronic signal processing circuit, said electronic circuit comprising a chip for processing a signal corresponding to the magnetic field induced in the passive coil; the sensor system also comprising a conductor element which is movable with respect to the passive coil such that the magnetic field induced in the passive coil varies; wherein the sensor comprises three coils, one of said three coils being an inductor coil and two of said three coils being passive coils; and the chip is an analogue chip, said analogue chip supplying an analogue sine-cosine output signal.

A magnetic response section provided by a scale of a magnetic linear sensor is configured so that changes in magnetic influence on a magnetic detection head appear alternately and repeatedly every first pitch in a displacement detection direction. The magnetic detection head is provided on one side of the scale in the first direction, which is a direction perpendicular to the displacement detection direction, and provided with a base substrate section and a plurality of signal output sections. The signal output sections are arranged on an insulating plate and in the displacement detection direction at a second pitch based on a first pitch. The first conductive pattern and the second conductive pattern included by each of the signal output sections are formed to arrange coil elements side by side in an elongated area in a second direction orthogonal to both the displacement detection direction and the first direction.

An object is to respectively excite transmission coils with different voltages using a single power supply with low power consumption in an electromagnetic induction type encoder. A detection head of an encoder includes a voltage adjustment circuit and a plurality of excitation circuits. The excitation circuit includes a resonant circuit that includes a driving capacitor and a transmission coil connected in series and generates an alternate-current magnetic field inducing currents in scale coils disposed in a plurality of scale tracks on a scale by connecting both ends of the resonant circuit in a state in which the driving capacitor is charged. The voltage adjustment circuit includes a first transformer capacitor and controls a charging voltage of the driving capacitor in a single excitation circuit using the charged first transformer capacitor.

A position of a target is determined using a linear inductive position sensor that includes a target coil, an excitation coil, two sensors and a Vernier processor. The sensors each include two or more receive coils. The receive coils include multiple twisted loops. In the first sensor, the coils have a first period, with loops offset by first distance. In the second sensor, the coils have a second period, with loops offset by a second distance. The target coil width is a function of the first distance and the second distance. During operation, the coils output voltages in which third, fifth and/or seventh harmonics are cancelled. Based on the voltages, the sensors output respective first and second position signals, from which the Vernier processor calculates the target’s position along an axis of the position sensor.

A position sensor system having at least two receiver coil sets, at least one transmitter coil and a signal conditioning and processing unit, wherein each receiver coil set of the at least two receiver coil sets includes at least two separate receiver coils including a sine receiver coil and a cosine receiver coil, wherein the signal conditioning and processing unit is contained in an integrated circuit, and wherein the at least two receiver coil sets, the at least one transmitter coil and the integrated circuit containing the signal conditioning and processing unit are located on a printed circuit board.