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Method and safety device for protecting an electric motor and/or a work device coupled to it against malfunction

A technology for controlling operations and protecting equipment, applied in motor control, general control systems, emergency protection circuit devices, etc., can solve problems such as interruption, machine damage, and irreparable problems

Active Publication Date: 2016-01-27
KRIWAN IND ELEKTRONIK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of corruption, it is possible in most cases to limit the damage to a significant portion by reinstalling the system from a backup and reconstructing the data
In the world of ICS (Industrial Control Systems) this is different: in this instance, through malware, machines can sometimes be damaged beyond repair
On the one hand, this results in the affected component having to be replaced, and on the other hand, the processes affected by this component are largely interrupted

Method used

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  • Method and safety device for protecting an electric motor and/or a work device coupled to it against malfunction

Examples

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Embodiment Construction

[0019] The electric machine 1 is connected by means of an electrical connection 2 to a control device 3 (frequency converter, regulator, PLC, etc.) and mechanically to an operating machine 4 . The operating machine 4 can be, for example, a compressor of a cooling circuit.

[0020] The protection device comprises at least a first detection unit 5, a second detection unit 6 and a third detection unit 7 each detecting a state variable of the motor 1, the control device of the motor or the operating machine 4, which state variables are related to the potential damage of the motor or the operating machine relevant. For example, the following state variables can be detected: switching frequency of the motor, maximum and / or minimum on-period, speed, direction of rotation, motor current in the motor windings, frequency of the motor current, motor voltage over frequency, motor current over frequency, Oscillations in motors and / or operating machines, process parameters in operating mac...

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PUM

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Abstract

A method for protection of an electric motor and / or operating machine coupled thereto from incorrect control operations detects the number of incorrect control operations of the electric motor and / or the operating machine in accordance with first and second error criterions. The numbers are totalled, and an alarm signal is produced and / or the electric motor is switched into a predefined state when the total exceeds a predetermined limit. A protection device for protecting an electric motor and / or an operating machine coupled thereto from incorrect control operations is also disclosed for carrying out the method.

Description

technical field [0001] The invention relates to a method and a protection device for protecting an electric motor and / or an operating machine coupled to the electric motor against incorrect control operations. Background technique [0002] Electric motors are used in many applications, sometimes also in applications with critical infrastructure such as, for example, in pumps of water supply systems or in cooling processes in power stations. In a world that is increasingly networked with the help of web technologies, computers and IT, industrial applications can also be attacked by hackers, viruses and malware. This problem has been exacerbated in recent years by the replacement and supplementation of dedicated or isolated fieldbuses and control and guidance systems by TCP / IP-based networks (Industrial Ethernet). In many cases, the control unit of the electric machine, the regulator, the frequency converter and other control units thus have an Internet connection. These con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08
CPCG01R31/343G05B23/0264H02P29/032G05B9/02
Inventor C·埃尔威恩
Owner KRIWAN IND ELEKTRONIK