Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A sensorless permanent magnet synchronous motor rotor position detection method

Active Publication Date: 2019-11-22
NORTHWESTERN POLYTECHNICAL UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method can estimate the rotor position at low speed or even zero speed, but when the motor is running in the high-speed area, the back electromotive force is too large, and the rotation component in the voltage equation cannot be ignored, which reduces the accuracy of position estimation and deteriorates the stability.

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 permanent magnet synchronous motor rotor position detection method
  • A sensorless permanent magnet synchronous motor rotor position detection method
  • A sensorless permanent magnet synchronous motor rotor position detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] During the rotation of the permanent magnet synchronous motor rotor, the winding will generate a back electromotive force due to cutting the magnetic force line, and the back electromotive force has a direct correspondence with the rotor phase, so the back electromotive force information can be used to monitor the phase of the rotor. During the operation of the motor, the amplitude of the reverse electromotive force is used to determine the phases of the rotor. The implementation method is complicated. On the one hand, there are high-frequency components in the currents of each phase. On the other hand, when the speed is unstable, the back electromotive force itself is also unstable. Therefore, it is not suitable to convert the rotor phase directly from the magnitude of the back electromotive force. The method of signal processing can be used to digitally process the change process of the back electromotive force of the three-phase winding, and extract some relatively sta...

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 method for detecting the position of a rotor of a PMSM (permanent magnet synchronous motor) without a position sensor, and the method comprises the steps: employing a signalprocessing method for the digital processing of a change process of the back electromotive force of a three-phase winding; extracting some relatively reliable feature position of the back electromotive force in the rotating process of the motor, such as a zero point and extreme points; obtaining the position feature points, and carrying out the estimation of the rotor position information betweenthe feature points through an extended Kalman filtering method, and finally obtaining the accurate position of the rotor. The method is convenient in data collection, is small in calculation burden,is good in real-time performances, and is suitable for the implementation of various types of motor controllers.

Description

technical field [0001] The invention relates to a method for detecting the rotor position of a permanent magnet synchronous motor without a position sensor, and belongs to the technical field of motor control. Background technique [0002] For permanent magnet synchronous motors to operate stably, the position of the permanent magnet rotor must be detected in real time to achieve closed-loop control. In order for the permanent magnet synchronous motor to operate in a closed loop, the drive system must know the magnetic pole position of the permanent magnet rotor in real time. Only in this way can the precise control of speed and current be satisfied, so the acquisition of rotor position and speed signals is a very important link in the entire drive system. [0003] The high-precision permanent magnet synchronous motor system puts forward high requirements for speed control and position control, and the requirements for sensors are also increased accordingly. Due to the ins...

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): H02P6/182H02P21/13H02P21/18
CPCH02P6/182H02P21/13H02P21/18
Inventor 高田薛峰羊彦
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
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