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Method for the protection of electric motors from critical operating states

A critical operation, motor technology, applied in the direction of motor control, emergency protection circuit devices, electrical components, etc.

Active Publication Date: 2016-09-21
KRIWAN IND ELEKTRONIK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This known method requires, in addition to measuring the actual motor current value, to record the ambient temperature of the motor

Method used

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  • Method for the protection of electric motors from critical operating states
  • Method for the protection of electric motors from critical operating states
  • Method for the protection of electric motors from critical operating states

Examples

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Embodiment Construction

[0029] figure 1 A circuit diagram with a three-phase motor 1 is shown, in which the motor current is tapped by a current transformer 2 in one phase and converted into a motor current value by a measuring resistor 3 in a microprocessor 4 . The determination of the motor current value is done continuously in predetermined short time intervals (eg 1 ms). This usually produces a characteristic curve for the starting region of a three-phase motor 1, such as figure 2 shown. After a very short first phase of widely fluctuating current amplitude of the motor, a start-up value 5 is set, for example defined by the current amplitude at a predetermined time t1 after switching on the motor. After time t1, the ever-falling transfer process is set to a threshold value 6, where threshold value 6 likewise represents the current amplitude established eg by multiplying (the current amplitude of) the start-up value 5 by a predetermined factor (eg 0.5). figure 2 The shown dynamics of the curr...

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PUM

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Abstract

Method for the protection of electric motors from critical operating states wherein, as the electric motor is operating, a motor current value and / or a motor voltage value is / are measured and compared with a permissible operating range wherein an output signal is generated when leaving the permissible operating range and, while the electric motor is operating, the permissible operating range is determined and adjusted continuously from the measured motor current value and / or from the measured motor voltage value.

Description

technical field [0001] The present invention relates to a method for protecting an electric motor from critical operating conditions, wherein while the electric motor is operating, values ​​of the motor current and / or motor voltage are measured and compared to a permissible operating range, wherein an output is generated when the permissible operating range is left Signal. Background technique [0002] A method for controlling an electric motor is described in DE 10 2004 036 134 A1, in which thermal overloading of the armature winding is avoided by means of a current regulator. Here, the motor current actual value is measured and compared with the motor setpoint current value, wherein in the case of a discrepancy, the motor actual current value is adjusted to the motor setpoint current value. In this case, the motor setpoint current value is calculated from the ambient temperature of the motor. This known method requires, in addition to measuring the actual motor current v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/028
CPCH02P29/00H02H7/0816H02P1/02H02P29/02
Inventor X·彭
Owner KRIWAN IND ELEKTRONIK