Siemens Aktiengesellschaft

Bernd Wedel

Dietmar Stoiber

Elmar Schäfers

Jens Hamann

Uwe Ladra

Hans-Peter Tröndle

Carsten Spindler

Gerhard Forster

Stefan Rupprecht

Martin Streubühr

Carsten Hamm

Hans-Georg Köpken

Stefan Künzel

Norbert Benesch

Joachim Denk

Christoph Fritsch

David Bitterolf

Klaus Geissdörfer

Jörg Reh

Dominic Buchstaller

Alexander Kubik

Joerg Reh

Winfried Glück

Theo Richter

Martin Streubuehr

Matthias Kaiser

A resonance method for a vibration system for resonant vibration of an excitation unit having a vibrating mass includes detecting a deflection of the vibrating mass, differentiating the deflection to form a velocity of the vibrating mass; generating from the deflection and the velocity a mechanical phase position; forming from the mechanical phase position a corrected phase position by using a correction value; forming, based on the corrected phase position, an electrical angular frequency with a P-regulation; integrating the electrical angular frequency to determine an electrical phase position; forming from the electrical phase position a correction factor by using a trigonometric function; and applying the correction factor to an excitation setpoint value to generate a corrected excitation setpoint value. Also disclosed are a converter, an excitation unit having the converter, and a vibration system having the excitation unit and the vibrating mass.

Resonance method for a vibration system, a converter, an excitation unit and the vibration system

A method for operating a system having at least two mechanically coupled asynchronous motors, a computer program implementing the method and a system operating in accordance with the method are disclosed. One asynchronous motor is selected as master, with the other asynchronous motor(s) selected as slave(s). An effective (master) flux angle is measured in the motor selected as master and used as a basis for a setpoint value for controlling the flux angle of every other motor (slave) in the system. The flux angle of every slave motor is adjusted to the setpoint value as part of the control operation.

Method for operating a system comprising at least two mechanically coupled asynchronous motors, computer program containing an implementation of the method and system operating in accordance with the method

A control device for drives of a machine switches between normal operation and special operation depending on power demand from a power supply. In both operating modes, the control device cyclically determines preliminary current setpoint values. In normal operation, the current setpoint values match the preliminary setpoint values. In special operation, the control device dynamically determines a proportional factor for the drives depending on nominal and/or actual operating states of the drives. The control device determines current setpoint values by modifying the preliminary current setpoint values so that a respective drive draws no more power than the product of the respective proportional factor and the available total power. The current setpoint values and the current actual values are fed to drive controllers for the first drives, by means of which the preliminary first current setpoint values are determined. The control characteristics of the drive controllers include an integral part.

Optimized operation of a machine having a plurality of drives

A method for locating a secondary part during use in a linear-motor-based system, wherein at least one primary part includes primary-part coils and is provided in the linear-motor-based system, the secondary part has a magnetic active part and the primary-part coils can be actuated via a drive current to achieve an advance of the secondary part, for locating the secondary part, the at least one primary part is energized via a primary current at a test frequency to induce a secondary current in at least one secondary-part winding provided on the secondary part and respective current responses of the primary-part coils are measured, where measured current changes in the current responses indicate the change in the inductance of the respective primary-part coil and a relative position of a secondary part to the respective primary-part coil.

Location of a secondary part during use in a linear-motor-based system

An induction machine includes a stator and a rotor, wherein a stator winding is arranged within the stator, a control device controls a converter such that the converter connects the stator winding to a power-supply network such that a stator current flows within the stator winding, and the stator current has a field-forming current component and a torque-forming current component, where the control device controls the converter such that, during load periods, a torque acts between the stator and the rotor, controls the converter during periods of rest such that a torque acts between the stator and the rotor, controls the converter at least at the beginning of the periods of rest such that the field-forming current component has a nominal value, and controls the converter during the load periods such that the field-forming current component has a lower value than the nominal value.

Induction machine having a customized field-forming current component

A method for identifying a secondary part during use in a linear-motor-based system, wherein a primary part includes primary-part coils in the linear-motor-based system, the secondary part has a magnetic active part and the primary-part coils can be actuated via a drive current such that an advancing force acting on the secondary part and movement of the secondary part along the primary part is achievable, where at least one secondary-part winding in a circuit is provided on the secondary part, selected primary-part coils are energized via a primary current at one or more test signal frequencies to induce a secondary current in the secondary-part winding to identify the rotor, a characteristic property of the secondary-part winding or the circuit is representative of the secondary part, and where the secondary current influences a current response of the primary-part coils and the characteristic property is measured using the current response.

Identification of a secondary part during use in a linear-motor-based system

The invention relates to a method of reducing vibrations, occurring during a machining operation, of a machine element () and/or of a workpiece () in a machine tool, production machine and/or in a machine () designed as a robot, wherein an additional mass () is attached to the machine element () and/or to the workpiece () in an automated manner, wherein the mass of the additional mass () is adapted to the machining operation. Furthermore, the invention relates to a machine () in this respect. The invention enables vibrations, occurring during a machining operation, of a machine element () of a machine () and/or of a workpiece () to be reduced.

Method for reducing vibrations, which occur during a machining process, of a machine element and/or of a workpiece

The invention relates to a magnetic bearing control device and the use of a three-phase converter for controlling a magnetic bearing. According to the invention, a three-phase converter () is used for controlling a magnetic bearing (), all three phase currents () of the converter () being used for controlling the magnetic bearing (). A first solenoid of a couple of solenoids () of the magnetic bearing () is connected to a first (U) and a third (W) phase current output of the converter () while a second solenoid of the couple of solenoids () is connected to the first (U) and a second (V) phase current output of the converter such that the couple of solenoids () can be differently controlled by means of said one converter (). The converter () can also be connected to magnetic bearings that already have a bias winding, which is advantageous for retrofitting such existing magnetic bearings, for example.

Magnetic bearing control device having a three-phase converter, and use of a three-phase converter for controlling a magnetic bearing

The invention relates to a synchronous motor () with a number of stator coils (), with a rotor () with at least one permanent magnet (), which induces a rotor magnetic field in a useful flux direction and with at least one coil winding (), which is fitted on the rotor in order to induce a resultant magnetic field as a result of an alternating magnetic fields which is applied with the aid of the stator coils, in the direction of a winding axis of the coil winding, so that a resultant inductance of the stator coils () with respect to a direction of the winding axis is different given different positions of the rotor ().

Synchronous motor, encoderless motor system and a method for operating an encoderless motor system with a synchronous motor

A piezo actuator includes an adaptation element, which is configured to adapt the piezo actuator to a controller for inductive loads, particularly to a converter for actuating inductive loads. The adaptation element allows use of controllers or converters of numerical control systems, which normally are used for actuating servo motors. Therefore it is no longer necessary to provide specially designed hardware for the actuation of piezo actuators, but instead the above-mentioned controllers can be used. Furthermore, as a result of the adaptation element, the piezo actuators can be integrated in the bus of the numerical control system. This allows communication in real time via the NC bus.

Piezoelectric actuator

The invention relates to a device for safeguarding uninterrupted power supply of a magnetic bearing () in the event of a power supply voltage (U) failure. Said device comprises: a first frequency converter () which is supplied with power by the supply voltage (U) and controls a motor (), and a transformer () which is connected to a rectifier () and the motor (), said rectifier () supplying a DC-link electric circuit () of a second frequency converter () controlling the magnetic bearing () with power in the event of a power supply voltage failure. The invention allows prevention of damages to the magnetic bearing in the event of disruption of power supply of the magnetic bearing in the event of a power supply voltage failure.

Device for safeguarding an uninterruptible power supply of a magnet bearing in the event of failure of an electrical supply voltage

The invention relates to a method for guiding the displacement of a displaceable machine element () in a machine, comprising the following steps: a) specification of a guide target variable (x) that describes the desired displacement operation of the machine element (); b) determination of a pilot actual variable (M) and/or a guide actual variable (x) from the guide target variable (x) using a model (), said model () comprising a path model (), which simulates the dynamic behaviour of the elements () involved in the displacement. The invention also relates to a device that corresponds to the method. The invention permits the optimised guidance of the displacement of a displaceable machine element () in a machine.

Method and device for guiding the movement of a moveable machine element of a machine

The invention relates to a drive system comprising a control unit (), which is connected to drive units () via a data bus () for the exchange of data. According to the invention, one drive unit () is connected to the drive motor () in order to control the latter () and an additional drive unit () is connected to a magnetic bearing () of a magnetic spindle bearing arrangement () in order to control said bearing (). The invention thus provides a drive system, in which a magnetic spindle bearing arrangement () is integrated.

Drive system

The invention relates to a machine, whereby at least one machine bed () of the machine is linked to a floor (), by means of at least one support element (), said support element () being pivotally mounted in relation to the machine bed () and the floor (). The invention also relates to a support element (), for bearing a machine, whereby said support element () comprises means (), by which the support element is pivotally linked to the machine and means (), by which said element is pivotally linked to the floor (). The invention thus avoids horizontal movements of the machine bed.

Machine with support elements

In a spindle rotor, the orientation of the figure axis is accepted and the anchoring of the rotor bearing (SL) is configured such that the orientation of the geometric rotational axis adapts to the physical main axis of inertia. The bearing is configured in the form of an actively controlled bearing, whereby the orientation is measured and is dynamically carried out, but also in the form of bearing comprising passive elements which are associated with the external ring of the bearing and enable a correspondingly dynamic orientation of the bearing. A damper (T) is provided to dampen the vibrations of the bearing (SL).

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Nürnberg, Germany

Bernd Wedel