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

Motor positive and negative rotation control circuit

A control circuit, forward and reverse technology, applied in emergency protection circuit devices, motor generators/starters, starters of single multi-phase induction motors, etc., can solve the problems that the main circuit cannot be cut off quickly, and the thermal relay does not respond quickly, etc. , achieve good phase loss protection function, prevent short circuit between phases, and prolong life

Active Publication Date: 2014-03-12
STATE GRID CORP OF CHINA +1
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is mainly because the thermal relay set in the prior art does not respond quickly and cannot quickly cut off the main circuit. Therefore, it is imperative to provide better phase loss protection for motors that frequently run forward and reverse

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
  • Motor positive and negative rotation control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0012] See attached figure 1 , Embodiment 1 of the present invention is a motor forward and reverse control circuit, the motor is a three-phase AC induction motor, the main circuit includes the main contact KM-1 of the contactor KM, the main contact KM1- of the contactor KM1 1. The main contact KM2-1 of the contactor KM2, wherein the main contact KM-1 of the contactor KM is connected to the three-phase AC power supply, the main contact KM1-1 of the contactor KM1 and the main contact KM2- of the contactor KM2 1. After parallel connection, it is connected in series between the main contact KM1-1 of the contactor KM and the thermal relay FR. The other end of the therma...

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 relates to a motor positive and negative rotation control circuit, comprising a contactor KM, a contactor KM1, a contactor KM2, a contactor KM3, a time relay KT1, a time relay KT2, a positive rotation switch SB3 and a negative rotation switch SB2. When a motor is switched into a negative direction from a positive direction or switched into a positive direction from a negative direction, on one hand, after a main contact KM1-1 of the contactor KM1 or a main contact KM2-1 of the contactor KM2 is completely subjected to arc extinction, the main contact KM2-1 of the contactor KM2 or the main contact KM1-1 of the contactor KM1 is closed under the condition that a main circuit is disconnected, so that the effect is played in protecting the main contact KM1-1 and the main contact KM2-1, and the interphase short circuit in the direction switching process is prevented; on the other hand, enough time is reserved for the motor being subjected to power failure for enabling that the speed of the motor is gradually reduced, so that the risks of damage of the motor and a transmission device are reduced; due to the arrangement of the contactor KM3 which is connected between two phases of a power supply in the main circuit, phase-lack protection can be provided.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a motor forward and reverse control circuit. Background technique [0002] In manufacturing enterprises, due to production needs, some motors work in the working mode of frequent forward and reverse rotation, but in the actual use process, when the motor is reversed, the contactor contacts in the control circuit will generate arcs, which is easy to cause Phase-to-phase short circuit often causes line failure or motor burnout due to the forward and reverse switching of the motor, which affects normal production to a certain extent. Moreover, when the motor is loaded, if the inertia of the load is large, the sudden reverse will easily damage the motor and the transmission device. The existing motor forward and reverse control circuit fails to take this into account. [0003] At the same time, during the frequent forward and reverse operation of the motor, in addition to the possibilit...

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
IPC IPC(8): H02P1/40H02H7/08
Inventor 裴玉杰黄玉霞关春梅陈刚张浩董军范希明穆景龙李险峰孙洪新
Owner STATE GRID CORP OF CHINA
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