Direct torque control method for brushless direct current motor

A technology of direct torque control and brush DC motor, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc. It can solve the problems of poor anti-interference ability, poor electromagnetic torque suppression effect, and low precision. Achieve the effects of simplified structure, low cost, and low precision

Inactive Publication Date: 2014-09-03
江苏新绿能科技有限公司
View PDF4 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention proposes a new type of direct torque control method for brushless DC motors, which avoids the defect that current hysteresis control has a poor suppression effect on electromagnetic torque, and overcomes the trad

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
  • Direct torque control method for brushless direct current motor
  • Direct torque control method for brushless direct current motor
  • Direct torque control method for brushless direct current motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Embodiment A direct torque control method of a brushless DC motor adopts double closed-loop control of speed and torque, wherein the speed loop is used as the outer loop, and the torque loop is used as the inner loop. The motor speed is calculated according to the output signal of the Hall sensor of the brushless DC motor, and the speed error is obtained after comparing with the reference speed, and the output after fuzzy adaptive adjustment is used as the torque expectation value. The torque error is obtained by subtracting the actual torque from the expected torque, and the actual torque is calculated by multiplying the back EMF by the phase current. The torque error is input into the hysteresis comparator, and its output is combined with the position signal of the rotor, and the appropriate voltage vector is selected from the established switch table to control the inverter bridge connected to the DC power supply, so that the brushless DC motor outputs a stable rotati...

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 direct torque control method for a brushless direct current motor. By speed and torque double closed loop control, a rotating speed loop is used as an outer loop, and a torque loop is used as an inner loop; motor speed is calculated according to an output signal of a Hall sensor of the brushless direct current motor, and the motor speed is compared with reference speed to obtain speed error; an output value obtained after fuzzy self-adaptation adjustment is used as a torque expectation value; torque error is obtained by subtracting actual torque from expectation torque, wherein the actual torque is calculated by multiplying back-EMF (Electromotive Force) and phase current; the torque error is inputted into a hysteresis comparator; the hysteresis comparator outputs a position signal of a rotor; and an appropriate voltage vector is selected from a formulated switch list to control an inverter bridge connected with a DC power supply so as to make the brushless direct current motor output stable torque. By the method, the defect that current hysteresis control has a poor effect of inhibiting electromagnetic torque is avoided, and the problem that a traditional PID control method has low precision and poor anti-jamming capability in control of BLDCM is overcome.

Description

technical field [0001] The invention relates to a direct torque control method of a brushless DC motor. Background technique [0002] As a kind of permanent magnet synchronous motor, brushless DC motor not only has the advantages of simple structure, reliable operation and convenient maintenance of AC motor, but also has the advantages of high operating efficiency, no excitation loss and good speed regulation performance of DC motor. Due to some disadvantages brought by mechanical brushes of DC motors, it is more and more widely used in various fields of national production. The brushless DC motor is a multi-variable, strongly coupled nonlinear system, and it is difficult to meet the actual requirements by classical control theory. The most prominent problem with brushless DC motors is torque ripple. Torque ripple brings vibration, resonance, noise and other problems, which reduces the control characteristics and reliability of the electric drive system, thus limiting the ...

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): H02P21/00
Inventor 张友刚王仁伟刘志刚
Owner 江苏新绿能科技有限公司
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap