Switchgear for controlling the energy supply of an electric motor connected thereto

US9502881B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dirk Hertz · Fichtenhof, DE
• Marco Schönenberg · Amberg, DE
• Johann Seitz · Amberg, DE
• Stefan Zitzler · Schwandorf, DE

Key dates

• Filing date: Aug 30, 2012
• Grant date: Nov 22, 2016
• Expiry date: Oct 2, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P29/025
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An embodiment of the invention relates to a switchgear which includes a control unit, a supply connection and a first current path. The first current path includes a first electromechanical switch and, connected in series to the first switch, a parallel connection of a second electromechanical switch to a semiconductor switch. The switchgear includes an energy accumulator and a measuring device. A control unit is capable of monitoring energy supply coming in through the supply connection. If the energy supply through the supply connection reaches a critical range, the control unit controls the output of the switching signals via the energy of the energy accumulator such that: in a first step, the semiconductor switch is switched to be electrically conducting and the second switch is then opened, and in a second step, the semiconductor switch is switched to be electrically non-conducting and the second switch is then opened.