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

Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor

A permanent magnet synchronous motor, rotor position technology, applied in the control of generators, motor control, motor generator control and other directions, can solve the problems of increasing the computational burden and complexity of the system, and achieve simple and convenient implementation, 2nd harmonic content The effect of reducing and reducing the computational burden

Active Publication Date: 2017-05-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF7 Cites 136 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modulate one of the signals to obtain the deviation related to the asymmetry of the motor parameters, and use it to compensate the position estimation error information in the modulation process of the other signal. This method effectively suppresses the 2nd harmonic component in the estimated position, but This significantly increases the computational burden and complexity of the system due to the need to inject two signals of different frequencies

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
  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor
  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor
  • Method for improving estimation accuracy of rotor position of permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0036] as attached figure 1 As shown, the present invention provides a method for improving the position estimation accuracy of a permanent magnet synchronous motor, which specifically includes the following steps:

[0037] Step 1) Inject a high-frequency cosine voltage U on the d-axis of the estimated rotor synchronous rotation coordinate system h cos(ω h t), where U h is the amplitude of the high-frequency voltage injected on the d-axis, ω h is the frequency of injecting high-frequency voltage on the d-axis, and t represents the current moment;

[0038] Step 2) To estimate the d-axis and q-axis voltage and Carry out Parker's inverse transformation to obtain the voltage u in the two-phase static α-β coordinate system α and u β , and then use the space vector pulse width modulation SVPWM to obtain six switching signals of the three-phase...

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 method for improving the estimation accuracy of the rotor position of a permanent magnet synchronous motor. The method comprises the following steps: on the basis of realizing estimation of the rotor position of the permanent magnet synchronous motor by utilizing a pulse-shake high frequency voltage injection method, processing the extracted position estimation error function, eliminating a second harmonic component introduced due to asymmetric motor parameters, so as to obtain a processed position estimation error function, then establishing a phase-locked loop, and adjusting the phase-locked loop to be 0, thus obtaining estimated rotor speed and estimated rotor position. The method disclosed by the invention can effectively inhibit position estimation second harmonic error caused by the asymmetric motor parameters, and the performance of a control system without a position sensor can be improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for improving the estimation accuracy of the rotor position of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used in industry due to their small size, light weight, high power factor and superior control performance. Rotor position is the indispensable information for permanent magnet synchronous motor to realize vector control. Mechanical position sensors such as photoelectric encoder and resolver increase the volume, weight and cost of the control system. Therefore, the position sensorless control technology of permanent magnet synchronous motor is obtained. received widespread attention. Among them, the pulse vibration high-frequency voltage injection method is simple to implement, has good robustness, and is suitable for zero and low speed applications, so it attracts a large number of scholars t...

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): H02P21/18H02P21/24H02P25/022
CPCH02P2203/11H02P2207/05
Inventor 刘兵周波倪天恒
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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