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Motor speed estimation for drive safety system

一种速度、安全功能的技术，应用在通用控制系统、电动发电机控制、电动机参数的估测/修正等方向，能够解决方案冲突、失败等问题

Pending Publication Date: 2021-05-28
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, established schemes often conflict or even fail entirely when applied to low-speed applications where it is often difficult to obtain useful voltage / current measurements

Method used

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  • Motor speed estimation for drive safety system
  • Motor speed estimation for drive safety system
  • Motor speed estimation for drive safety system

Examples

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Embodiment Construction

[0012] The following embodiments are given as examples only. Although the specification may refer to "an", "an" or "some" implementations and / or examples in several places in the text, this does not necessarily mean that every reference is to the same implementations and / or examples. or specific features apply only to a single implementation and / or example. Single features of different embodiments and / or examples may also be combined to provide further embodiments and / or examples.

[0013] figure 1 The general architecture of a system to which embodiments of the invention may be applied is shown. figure 1 A simplified system architecture is shown showing only some elements and functional entities (i.e. only some functional safety-related elements and functional entities are shown), all of which are logical units whose implementation can be compared with all shown differently. figure 1 The connections shown are logical connections; the actual physical connections may be dif...

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Abstract

The invention relates to motor speed estimation for a drive safety system. According to an aspect, there is provided a method for evaluating safety of a speed of a motor controlled by a frequency converter. The method comprises, first, measuring first, second and third phase currents of three-phase electric power fed from the frequency converter to the motor and forming first, second and third current measurement pairs based thereon. Then, the speed of the motor is estimated separately based on each measurement pair to produce respective first, second and third estimates for the speed of the motor. A voting logic is applied to the first, second and third estimates. An output of the voting logic is fed to a safety logic controlling at least one safety function of the frequency converter. The output of the voting logic comprises an estimate for the speed of the motor and an indication whether or not said final estimate is valid according to the voting logic.

Description

technical field [0001] Various example embodiments relate to control of industrial processes. Background technique [0002] The use of drives (or equivalent frequency converters) to control the movement of machines is often used to achieve the best performance and efficiency from a given machine or machines. Drives are used in many applications that require precise motion control such as production line automation using lifts, cranes and / or conveyor belts. In many applications, it is often critical that the speed of the motor does not exceed certain predefined limits allowed for safe operation. Therefore, various schemes for estimating safe motor speeds have been implemented to ensure this does not happen. Many of these schemes are based on monitoring the voltage or two or three phase currents associated with the motor. However, established solutions often conflict or even fail entirely when applied to low speed applications where it is often difficult to obtain useful vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/10H02P23/14H02P21/18
CPCH02P29/10H02P23/14H02P21/18G05B19/048G05B9/02G05B2219/24008G01R31/343H02P3/06
Inventor 托尼·库伊卡尤霍·萨尔米宁彼得里·哈万托
Owner ABB (SCHWEIZ) AG
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