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

A switchgear and energy supply technology, which is applied in the direction of electric switches, deceleration devices of AC motors, control systems, etc., can solve the problems of limited quantity and wear of switches, achieve small hardware consumption, improve switching characteristics, and increase operating cycles Quantity effect

Active Publication Date: 2017-06-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By switching off the power supply and automatically opening the switch, a breaking arc is formed at the switch, which causes severe wear at the switch, so that the number of such operating cycles in switchgear is usually limited

Method used

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  • Switchgear for controlling the energy supply of an electric motor connected downstream

Examples

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Embodiment Construction

[0034] The drawing shows a schematic diagram of a system for safely operating an electric machine 5 . The system comprises a power supply network 9 , a motor 5 , a switchgear 1 , a power source 50 and an emergency stop switchgear 40 .

[0035] The switching device 1 is connected to the supply network 9 with its three connection points 3 on the input side and to the electric machine 5 with its three connection points 4 on the output side. Motor 5 is an asynchronous motor. The power supply network 9 is a three-phase AC network for industrial low-voltage switchgear. The switching device 1 is a motor starter 1 , by means of which the energy supply to a downstream electric motor 5 can be controlled.

[0036] The first phase 10 of the supply network 9 is connected by means of a conductor to the connection point 3 on the input side and leads within the device via a first current path 15 of the motor starter 1 to the connection point 4 on the output side and subsequently by means of...

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PUM

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Abstract

The invention relates to a switchgear (1) comprising a control unit (2), a supply connection (7) and a first current path (15), wherein the first current path (15) comprises an electromechanical first switch (11 ) and a parallel circuit of an electromechanical second switch (13) and a semiconductor switch (12) in series with the first switch (11). It is proposed to provide a switchgear (1) with an increased number of operating cycles, the switchgear (1) comprising an energy store (6) and a measuring device (8), wherein the control unit (2) can monitor by means of the measuring device (8) Energy supply via the supply connection (7), wherein the control unit (2) is designed such that, as soon as the energy supply via the supply connection (7) falls into the critical area, the control unit The output of the energy-controlled switch-on signal makes: - the semiconductor switch (12) is connected conductively in a first step and the second switch (13) is subsequently switched off, - after the first step, it is not conductive in a second step Ground connects the semiconductor switch (12) and then opens the first switch (11).

Description

technical field [0001] The invention relates to a switchgear and a method for a switchgear. The switching device according to the invention is used in particular within the framework of industrial automation technology. In particular, the switchgear is a motor starter. Background technique [0002] An electric machine connected downstream of the switching device can be controlled by means of the switching device. For this purpose, the electric machine connected downstream of the switching device is supplied with energy via the switching device, so that the electric machine is connected to the supply network. In particular, the power supply network is the low-voltage network of an industrial facility (for example three-phase, 400 Volts, 50 Hz). [0003] In order to control the energy supply of a downstream electric motor, the switching device comprises a control unit and a first current path. Via the first current path, the first phase of the supply network is conducted t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/54H02P3/22H02P29/02
CPCH01H9/541H02P3/22H02P29/025H02H3/08
Inventor 迪尔克·赫兹马尔科·舍嫩伯格约翰·塞茨斯特凡·齐茨勒
Owner SIEMENS AG
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