Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Current sensor fault diagnosis method, device and frequency converter for synchronous motor

A technology of current sensor and synchronous motor, which is applied in the field of current sensor fault diagnosis and frequency converter, which can solve the problems of difficult detection of current sensor and poor reliability of system operation, and achieve the effect of facilitating troubleshooting and improving reliability

Active Publication Date: 2020-02-07
GREE ELECTRIC APPLIANCES INC +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome the defects of the above-mentioned prior art, and provide a current sensor fault diagnosis method, device and frequency converter for synchronous motors, so as to solve the problems that the fault of the current sensor is difficult to detect and the reliability of the system is poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Current sensor fault diagnosis method, device and frequency converter for synchronous motor
  • Current sensor fault diagnosis method, device and frequency converter for synchronous motor
  • Current sensor fault diagnosis method, device and frequency converter for synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0044] image 3 It is a work flow chart of another preferred embodiment of the current sensor fault diagnosis method for synchronous motors provided by the present invention. Such as image 3 As shown, according to an embodiment of the current sensor fault diagnosis method for synchronous motors of the present invention, it further includes: generating a fault signal and / or displaying fault information after judging that the current sensor is faulty. Based on the technical solution provided by the present invention, the diagnosis of the current sensor is mainly based on the change of the output variable before and after the fault in the normal operation and fault operation of the motor, and it is diagnosed whether the current sensor will fail. If it occurs, a fault signal FLAG (flag) is generated, and / or a fault code is displayed on the control panel. FLAG is a single-bit flag used to record the state of the program in a computer program. The program changes the value of FLA...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a synchronous motor current sensor fault diagnosis method and device and a frequency converter. The synchronous motor current sensor fault diagnosis method comprises the following steps: obtaining a sampling value of current of a synchronous motor; establishing a Lenberg observer model according to a current state equation of the synchronous motor, and obtaining an observed value of the current through a Lenberg observer; and when the deviation of the observed value and the sampling value exceeds a preset difference threshold value, judging that the current sensor has fault. According to the technical scheme, the synchronous motor current sensor fault diagnosis method and device can judge the fault of the current sensor timely and accurately, facilitate workers to carry out trouble removal and improve system operation reliability.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a current sensor fault diagnosis method, device and frequency converter for synchronous motors. Background technique [0002] When the frequency converter adopts vector control, it usually needs to use the current sensor. Sensors are very precise and susceptible to interference. In the factory environment, due to factors such as noise, vibration, surge voltage and inrush current, the performance of the sensor will degrade, malfunction and fail, and then affect the normal operation of the system. According to statistics, in the automation system, the number of false alarms due to sensor failure accounts for about half of the total failure. It can be seen that it is very necessary to diagnose the fault of the sensor. However, in the prior art, it is not easy to detect the failure of the current sensor, and it is also difficult for the staff to troubleshoot, resulting in poor relia...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 赵杰程海珍
Owner GREE ELECTRIC APPLIANCES INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com