Siemens Aktiengesellschaft

Andreas Fritsch

Johann Seitz

Gerd Griepentrog

Diethard Runggaldier

Markus Meier

Norbert Reichenbach

Bernhard Streich

Bernhard Wiesgickl

Peter Kaluza

Manuel Geitner

Josef Burger

Fritz Royer

Hubert Kuhla

Stefan Gruber

Marcel Benecke

Matthias Meier

Manfred Prölss

Jürgen Trottmann

Maximilian Korff

Konrad Spindler

Josef Koller

Markus Riech

Norbert Lindner

Christian Löh

Bastian Schütz

Annette Maeggi

A switching apparatus includes an energy store and two measuring devices connected to the control apparatus, the energy store being connected in series between the supply connection and the power supply via the first measuring device, the control apparatus can ascertain if the supply voltage attached to the primary side of the power supply falls short of a first voltage threshold value and, via the second measuring device, if the supply voltage of the power supply attached to the secondary side of the power supply falls short of a second voltage threshold value, the control apparatus evaluates the time between falling short of the first voltage threshold value and falling short of the second voltage threshold value.

Switching device for controlling energy supply of a downstream electric motor

A switching device includes an energy store and a measuring device connected to a control apparatus. The energy store is connected in series between the supply connection and the power supply. The control apparatus can monitor the energy supply of the switching device in the area between the supply connection and the power supply taking place via the supply connection via the measuring device. If the energy supply monitored by the measuring device falls into a critical range, and using the energy from the energy store: the control apparatus connects the semiconductor switch in an electrically conductive manner and then opens the second switch; and subsequently switches the semiconductor switch to an electrically non-conductive state and then opens the first switch.

At least one embodiment of the invention relates to a protective circuit for protection of an appliance, in particular of an electric motor, against thermal overloading. In at least one embodiment, the protective circuit includes a first and a second terminal for connecting a temperature detection element; a detection unit for detecting whether a resistance value of the temperature detector element which is connected between the first and the second terminals, is in a first or a second resistance range; a short-circuit detector for identifying whether there is a short circuit between the first and the second terminals; signaling outputs for emitting signal messages to an evaluation unit when the detected resistance value is in the second resistance range and/or when a short circuit has been identified by the short-circuit detector; and a third terminal, which is connected to the second terminal via a predetermined resistance.

Protective circuit for protection of an appliance, in particular an electric motor, against thermal overloading

A method is disclosed for operating a two-phase rotary current controller. In order to optimize the operation of a two-phase rotary current controller, magnitudes of a parameter that can be varied in both controllable phases of a two-phase rotary current controller is matched in these phases. In particular, the existing principle of phase-symmetric control with a uniform ignition delay in both controlled outer conductors is abandoned, and a separate ignition delay is stipulated for each of the two controlled outer conductors.

Method for operating a two-phase rotary current controller

A method with which the load current and thus the load moment of an asynchronous motor that is controlled via a phase-controlled two-phase thyristor power controller, can be easily influenced so as to allow a smooth starting operation. According to a first embodiment, the ignition point is determined in the controlled phase in order to adapt the flow angles of the subsequent current half waves. According to a second embodiment, the ignition point of the subsequent current half waves is brought forward in both controlled phases.

Method for reducing the influence of a DC current component in the load current of an asynchronous motor

Three-phase power controller with interrupt-controlled phase-gating

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Kümmersbruck, Germany

Andreas Fritsch