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

A sensorless control method and control device for a permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, control of electromechanical transmission, electronic commutation motor control, etc., can solve the problems of limited rapidity and anti-interference ability.

Inactive Publication Date: 2015-10-28
NANJING INST OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method first observes the back electromotive force of the motor by constructing a sliding mode observer, and then directly or indirectly estimates the rotor position and speed from the back electromotive force. It has the characteristics of simple principle and good stability. When the load is disturbed, the speed and anti-interference ability of this method are very limited

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
  • A sensorless control method and control device for a permanent magnet synchronous motor
  • A sensorless control method and control device for a permanent magnet synchronous motor
  • A sensorless control method and control device for a permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0056] The present invention designs a sensorless control method for a permanent magnet synchronous motor, comprising the following specific steps:

[0057] Step (1): Collect the three-phase current i of the permanent magnet synchronous motor a i b i c , and carry out the Clark transformation to convert to the equivalent current i in the α-β coordinate system a i β ;

[0058] Step (2): According to the equivalent current i in the α-β coordinate system in step (1) a i β And the equivalent voltage u in the α-β coordinate system a , u β A fractional-order sliding mode observer is constructed, and the fractional-order sliding mode observer outputs the observed value of back electromotive force under the α-β coordinate system

[0059] Step (3): Use the back EMF observations in the α-β coordinate system in step (2) Realize the estimation of the electronic angul...

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 discloses a sensor-less control method for a permanent-magnet synchronous motor. The sensor-less control method includes converting three-phase current of the permanent-magnet synchronous motor into equivalent current i alpha and i beta in an alpha-beta coordinate system; constructing a frictional order sliding-mode observer according to the equivalent current i alpha and i beta and equivalent voltage u alpha and u beta in the alpha-beta coordinate system, outputting counter electromotive force observed value in the alpha-beta coordinate system so as to realize estimation of angular velocity of rotors and positions of the rotors of the motor according to the counter electromotive force observed value. The invention further relates to a sensor-less control device for the permanent-magnet synchronous motor. By the sensor-less control method and the sensor-less control device for the permanent-magnet synchronous motor, counter electromotive force of the motor and position and speed of the rotors can be estimated quickly and accurately on conditions of parameter perturbation and load disturbance of a permanent-magnet synchronous motor control system, and interference resistance capacity of the system can be improved effectively.

Description

technical field [0001] The invention relates to a sensorless control method and a control device for a permanent magnet synchronous motor, belonging to the technical field of AC servo motor control. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density, high energy conversion efficiency, wide speed range, small size, light weight, etc., and are widely used in industrial, civil, military and other fields. [0003] The control of the permanent magnet synchronous motor needs to obtain the position and speed information of the motor rotor. At present, the commonly used position sensors include photoelectric encoders, resolvers and other devices. The use of these devices not only increases the size and cost of the system, but also reduces the system cost. The reliability of the permanent magnet synchronous motor also limits the application in special environments, so the sensorless control method has become a research hotspot ...

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): H02P21/14H02P21/18H02P21/24
Inventor 黄家才李宏胜徐庆宏张爽
Owner NANJING INST OF TECH
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