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

Novel brushless direct current motor PWM setting method

A brushed DC motor, a new type of technology, applied in the direction of torque ripple control, etc., can solve the problems that the technology has not been reported yet, and the research of off-phase PWM control technology is seldom, so as to achieve the effect of weakening the low-speed commutation torque ripple

Inactive Publication Date: 2018-11-23
张懿
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few studies on the off-phase PWM control technology in the commutation process of brushless DC motors, and the application technology of the present invention has not yet been reported.

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
  • Novel brushless direct current motor PWM setting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, a novel brushless DC motor PWM setting method of the present invention comprises the following steps:

[0018] Step 1. Perform PWM modulation control on the brushless DC motor. After the brushless DC motor enters a low-speed steady-state working state, determine to turn off the power tube in the three-phase full-bridge inverter during the commutation process of the brushless DC motor;

[0019] Step 2, setting the PWM duty cycle initial value of the power tube of the same bridge arm as the shut-off power tube in the three-phase full-bridge inverter to 0;

[0020] Step 3. In each subsequent commutation period, the PWM duty cycle of the power tubes of the same bridge arm as the shut-off power tube in the three-phase full-bridge inverter is gradually increased by 0.1%;

[0021] Step 4. ...

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 novel brushless direct current motor PWM setting method. The setting method comprises the following steps of: after the brushless direct current motor enters the low-speed steady-state operating state, determining the turn-off power tube in the three-phase full-bridge inverter during the commutation process of the brushless direct current motor; setting the initial valueof the PWM duty ratio of the power tube in the same bridge arm as the turn-off power tube in the three-phase full-bridge inverter to be 0; successively increasing the PWM duty ratio of the power tubein the same bridge arm as the turn-off power tube in the three-phase full-bridge inverter by 0.1% in each commutation period; recording the non-commutation phase current Ia before commutation of eachcommutation period; recording the non-commutation current Ib in each commutation period; subtracting the Ib from the Ia to obtain a non-commutation phase current deviation [delta]I of the brushless direct current motor; when the absolute value of [delta]I / Ia is minimized, using the power tube PWM duty ratio in the same bridge arm as the turn-off power tube in the three-phase full-bridge inverter as a power tube PWM setting value in the same bridge arm as the turn-off power tube in the three-phase full-bridge inverter of the brushless direct current motor.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, relates to a brushless direct current motor, in particular to a novel brushless direct current motor PWM setting method. Background technique [0002] Brushless DC motors have many advantages such as simple structure, high power density, and simple control. In recent years, brushless DC motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] The commutation torque pulsation generated during the commutation of the brushless DC motor can cause motor vibration and noise, which limits the application range of this type of motor. Taking the brushless DC motor with 120° conduction and three-phase six-state control as an example, when the low-speed brushless DC motor commutates, the current change rate of the off-phase is too small. During the phase-off process, the phase current is not co...

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 Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 张懿
Owner 张懿
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