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Method and protective device for protecting an electric motor and/or an operating machine coupled to an electric motor against incorrect control operation

A technology for controlling operation and protecting equipment, which is applied in motor control, general control system, emergency protection circuit device, etc., and can solve problems such as machine damage, interruption, and irreparability

Active Publication Date: 2019-10-29
KRIWAN IND ELEKTRONIK
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  • 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 protective device for protecting an electric motor and/or an operating machine coupled to an electric motor against incorrect control operation

Examples

Experimental program
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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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Abstract

In a method for protecting an electric motor and / or an operating machine coupled to an electric motor from incorrect control operations, the number of incorrect control operations of the electric motor and / or the operating machine is detected according to a first error criterion, and according to a second error criterion Criteria to detect the number of incorrect control operations of the motor and / or operating the machine and summing the two numbers. In this example, an alarm signal is generated and / or the motor is switched to a predefined state when the total number of detected incorrect control operations exceeds a predetermined limit. A protection device for protecting an electric motor and / or an operating machine coupled to the electric motor from incorrect control operation basically provides the following components: a first detection unit for detecting incorrect operation of the electric motor and / or the operating machine according to a first error criterion Correct control operations; at least a second detection unit for detecting incorrect control operations of the motor and / or operating machine according to a second error criterion; summing means for summing the number of incorrect control operations; and An actuating unit for generating an alarm signal and / or switching the motor to a predefined state when the total number of detected incorrect control operations exceeds a predetermined limit.

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