Check patentability & draft patents in minutes with Patsnap Eureka AI!

Phase-cut PWM control method of brushless DC motor

A technology of brush DC motor and control method, which is applied in the field of brushless DC motor off-phase PWM control and brushless DC motor control, can solve the problems that the technology has not been reported yet, and there are few researches on off-phase PWM control technology, and achieves Reduce the effect of low-speed commutation torque ripple

Inactive Publication Date: 2018-12-11
魏传月
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
  • Phase-cut PWM control method of brushless DC motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, the present invention provides a brushless DC motor shutdown phase PWM control method, comprising the following steps:

[0020] Step 1. Determine the power tube to be turned off in the three-phase full-bridge inverter during the commutation process of the brushless DC motor;

[0021] Step 2. Record the rotational speed Sa of the brushless DC motor before commutation;

[0022] Step 3. Record the rotational speed Sb of the brushless DC motor during the commutation process;

[0023] Step 4: Subtract the brushless DC motor speed Sb during the phase commutation process from the brushless DC motor speed Sa before commutation to obtain the brushless DC motor speed deviation ΔS;

[0024] Step 5: Differentiate the rotational speed deviation ΔS of the brushless DC motor to obtain ΔSw;

[00...

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 phase-cut PWM control method of a brushless DC motor. The control method comprises the following steps: determining the power-off transistor in a three-phase full-bridge inverter in the commutation process of the brushless DC motor; Recording the rotational speed Sa of the brushless DC motor before commutation; Recording the rotational speed Sb of the brushless DC motor in the commutation process; Subtracting the rotational speed Sb of the brushless DC motor in the commutation process from the rotational speed Sa of the brushless DC motor before commutation to obtainthe rotational speed deviation DELTA S of the brushless DC motor; DELTA Sw is obtained by differentiating the speed deviation DELTA S of the brushless DC motor; Performing a PI operation on the. DELTASw; The result of the PI operation is limited to 0-100% range to obtain the value D; Controlling the power transistor with the same bridge arm as the power transistor in the three-phase full-bridge inverter to perform PWM modulation with D as the duty cycle so as to weaken the low-speed commutation torque ripple of brushless DC 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 brushless direct current motor off-phase PWM control 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 no...

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): H02P6/10H02P6/14
CPCH02P6/10H02P6/14
Inventor 魏传月
Owner 魏传月
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com