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

Double random spread spectrum modulation method based on four-state Markov chain

A technology of Markov chain and spread spectrum modulation, which is applied in the direction of motor generator control, electromechanical brake control, AC motor control, etc., can solve problems such as high harmonic energy, achieve continuous and flat spectrum, improve electromagnetic compatibility, and suppress Effects of Electromagnetic Interference

Active Publication Date: 2020-11-27
苏州崧崧智能控制技术有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is based on the double random spread spectrum modulation method of the four-state Markov chain to solve the disadvantages of the traditional SVPWM control strategy in the inverter output higher harmonic energy at the switching frequency and its integer multiples

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
  • Double random spread spectrum modulation method based on four-state Markov chain
  • Double random spread spectrum modulation method based on four-state Markov chain
  • Double random spread spectrum modulation method based on four-state Markov chain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] In order to make it easy to understand the technical means, creative features, work flow, and use methods of the present invention to achieve the purpose and effect, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] The connection structure between the three-phase inverter circuit and the motor is as follows: figure 1 shown. Among them, the DC side bus voltage is U dc , S 1 ~S 6 There are 6 power switching tube devices. Since the two power switching devices on the same side bridge arm have different states at the same time, the switching states of the three upper bridge arms are marked as S a , S b , S c . Taking phase A as an example, S a = 1, the switching device of the upper bridge arm is turned on; S a =0, the switching device of the lower bridge arm is turned on, and the other phases are the same. Therefore the switching device switching mode (S c ,S b ,S a ) total 2 3...

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 double random spread spectrum modulation method based on a four-state Markov chain, and the method comprises the steps: S1, randomizing a switching frequency, determining a sector to which a target voltage vector belongs, selecting two non-zero voltage vectors closest to the target voltage vector in an alpha beta plane, and combining the two non-zero voltage vectors to synthesize the target voltage vector; S2, respectively obtaining action time of the two non-zero voltage vectors and total action time of the zero vector according to the target voltage vector and the current switching period; S3, determining a zero vector distribution scheme according to the modulation index; S4, arranging the action sequence of the basic vectors according to an existing symmetrical seven-section SVPWM modulation mode, and PWM pulse waveforms are generated. According to the method, the switching frequency and harmonic energy at the frequency multiplication position in three-phase permanent magnet synchronous motor control can be reduced, the inverter voltage and current output frequency spectrum is dispersed and tends to be flat, and conducted electromagnetic interference is restrained.

Description

technical field [0001] The invention relates to a motor control method, in particular to a double random spread spectrum modulation method based on a four-state Markov chain. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) uses permanent magnets instead of energized coils to generate an excitation magnetic field. With the continuous improvement and improvement of the performance of permanent magnet materials, permanent magnet synchronous motors are small in size, light in weight, efficient and reliable. It has been applied to various fields such as aerospace, industrial production, and daily life. [0003] The permanent magnet synchronous motor drive system is generally controlled by a pulse width modulation (Pulse Width Modulation, PWM) technology with a fixed switching frequency. When a fixed switching frequency is used to drive the motor, the switching device IGBT of the motor controller will be in a high-speed on-off mode, which will cause the ha...

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): H02P21/24H02P27/12H02M1/44
CPCH02M1/44H02P27/12H02P21/24
Inventor 武建飞颜心王少杰
Owner 苏州崧崧智能控制技术有限公司
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