Abstract: A method for the diagnosis of natural vibrations in a mechatronic system, includes at least one rigid body (WT1, WT2), which is moved relative to another rigid body (S) by means of at least one numerically-controlled drive, whereby the natural vibrations are caused by the drive (A1, A2) and are detected by sensors (WM1, WM2, N1, N2, BA1, BA2,) internal or external to the system. The drives (A1, A2) can be used as a system-internal, vibration-generator, so-called rotatory shakers, by superimposing white noise on a constant speed for the drive, or by wobbling the frequencies.

Abstract: Parallel kinematics with rod guidance are nowadays used in machine tools, production machines and robotics. Changes in rod length caused by the special position of the moving work platform (P), by its acceleration and other force impact, can lead to positional errors. Such errors are eliminated by means of piezo-actuators (PA1–PA6) which are integrated into the rods (S1 to S6).

Abstract: A device for compensating a torque produced on a movable axle in a machine tool or production machine by a gyrostatic effect includes a rotating useful machine system attached to the movable axle and producing a useful angular momentum, and a rotating machine counter-system attached to the axle and producing a counter angular momentum. The magnitude of the counter angular momentum is substantially identical to the magnitude of the useful angular momentum. The useful torque produced by a movement of the rotating useful machine system through a temporal change of the useful angular momentum is at least partially compensated by a counter-torque produced by a temporal change of the counter angular momentum. This arrangement represents a simple device for compensating a torque produced by the gyrostatic effect on a movable axle of machine tolls and production machines.

Abstract: A device and a method are disclosed for attenuating a chatter oscillation in a processing machine, for example a cutting machine, such as a lathe. The machine includes at least one feed system with a primary section and a secondary section driven by a linear motor which can be powered via a converter. The device has a magnetic field control to control an in-phase component (d-component) of the magnetic field which produces the attractive force between of the primary section and the secondary section. An actual signal that is proportional to the chatter oscillation is generated and compared with a predetermined setpoint for a chatter oscillation. The comparison produces a control variable which is applied as a current setpoint to a field control that controls the current of the linear motor. This sufficiently attenuates chatter oscillations so that a reduction of the cutting depth is no longer required.

Abstract: A circulating mechanism includes a moving member, e.g. a chain or a belt, which travels along a circulating path and is looped about at least one deflecting member for reversing a travel direction of the moving member. Disposed in a section of the circulating path is a guide assembly for guiding the moving member. A magnetic field generating device is provided for applying a magnetic force upon the moving member at least in an area of the guide assembly so as to draw the moving member against the guide assembly and thereby enhance the travel behavior of the moving member.

Abstract: Apparatus for generating surface pressure in for example an injection molding machine wherein the machine has a stationary carrier platen, a clamping platen and a closing platen that can be moved electromechanically, and wherein the material to be molded is disposed between the closing and carrier platen. The compressive force of the closing platen is actuated by piezoelectric actuators.

Abstract: The excitation of an oscillation in a mechanical system, such as a machine element, subjected to a jerk can be suppressed or at least attenuated by rounding a corresponding jerk curve and/or by tuning the stop band of a bandstop filter to the characteristic frequencies of the mechanical system or machine element. In combination, both measures can improve the positioning accuracy while at the same time minimizing excitation of oscillations.

Abstract: A measuring and simulation system for a machine-tool or production machine is described. Measurement results and simulation results are visualized simultaneously side-by-side on a common monitor display screen. A user can then easily set and optimize the control parameters of the machine-tool or production machine by a straightforward comparison between the measurement results and the simulation results.

Abstract: A device for linearly moving a useful mass is described. Typically, when a large useful mass is moved, relatively large forces are transferred by a spindle or a toothed rack to the corresponding machine or machine frame. These forces can be compensated by moving a compensating mass in the opposite direction of the useful mass.

Abstract: An induction apparatus includes a winding arrangement having a winding start and a winding end for inducing a magnetic field in a magnetizable core; and a lossy, magnetizable device through which and/or about which the winding start and the winding end of the winding arrangement is so disposed as to induce a magnetic flux in the magnetizable device. This arrangement prevents an electric breakdown at the star point of winding strands of synchronous motors.

Abstract: Parallel kinematics with rod guidance are nowadays used in machine tools, production machines and robotics. Changes in rod length caused by the special position of the moving work platform (P), by its acceleration and other force impact, can lead to positional errors. Such errors are eliminated by means of piezo-actuators (PA1-PA6) which are integrated into the rods (S1 to S6).

Abstract: In an injection-molding machine, the rapid traversing over long distances takes place with the aid of linear drives (L1, L2), the “rotor” (H1, H2) which is a component part of the machine construction.

Abstract: A method for the diagnosis of natural vibrations in a mechatronic system, includes at least one rigid body (WT1, WT2), which is moved relative to another rigid body (S) by means of at least one numerically-controlled drive, whereby the natural vibrations are caused by the drive (A1, A2) and are detected by sensors (WM1, WM2, N1, N2, BA1, BA2,) internal or external to the system. The drives (A1, A2) can be used as a system-internal, vibration-generator, so-called rotatory shakers, by superimposing white noise on a constant speed for the drive, or by wobbling the frequencies.

Abstract: A device and a method are disclosed for attenuating a chatter oscillation in a processing machine, for example a cutting machine, such as a lathe. The machine includes at least one feed system with a primary section and a secondary section driven by a linear motor which can be powered via a converter. The device has a magnetic field control to control an in-phase component (d-component) of the magnetic field which produces the attractive force between of the primary section and the secondary section. An actual signal that is proportional to the chatter oscillation is generated and compared with a predetermined setpoint for a chatter oscillation. The comparison produces a control variable which is applied as a current setpoint to a field control that controls the current of the linear motor. This sufficiently attenuates chatter oscillations so that a reduction of the cutting depth is no longer required.

Abstract: The excitation of an oscillation in a mechanical system, such as a machine element, subjected to a jerk can be suppressed or at least attenuated by rounding a corresponding jerk curve and/or by tuning the stop band of a bandstop filter to the characteristic frequencies of the mechanical system or machine element. In combination, both measures can improve the positioning accuracy while at the same time minimizing excitation of oscillations.

Abstract: An induction apparatus includes a winding arrangement having a winding start and a winding end for inducing a magnetic field in a magnetizable core; and a lossy, magnetizable device through which and/or about which the winding start and the winding end of the winding arrangement is so disposed as to induce a magnetic flux in the magnetizable device. This arrangement prevents an electric breakdown at the star point of winding strands of synchronous motors.

Abstract: In an arrangement of a plurality of electric machines, the electric machines are defined by axes in parallel relationship, wherein the electric machines include a common stator which incorporates a plurality of stator portions. The stator portions of the stator cooperate with rotors which are insertable in the stator portions, whereby the number of rotors corresponds to the number of the axes of the electric machines.

Abstract: In an injection molding machine, rapid movement over long distances is carried out with the aid of conventional means, as is the action of locking in the working position. The novel feature is, then, that in order to hold counter to the flow front of the injected material, piezoelectric actuators (P11 to Pnn) are used.

Abstract: In an injection-molding machine, the rapid traversing over long distances takes place with the aid of linear drives (L1, L2), the “rotor” (H1, H2) which is a component part of the machine construction.

Abstract: A frequency changer having parallel partial frequency changers with a dc circuit has chokes that impress dc currents. These chokes are magnetically coupled to each other such that the change of a dc current in one of the partial frequency changers causes a corresponding change of the dc currents in the parallel partial frequency changer in the sense of a lead control. In a frequency changer constructed with an even number of partial frequency changers, the individual chokes can be coupled such that the magnetic dc fluxes in the coupling caused by the dc currents in the chokes are compensated.