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

Operation method for stepping constant torque control on permanent magnet brushless direct current motor

A permanent magnet brushless DC, operating method technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve problems such as inability to position, different torques, and large step angles of motors

Active Publication Date: 2015-04-08
HEBEI UNIV OF TECH
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of its structure, the distribution of its air gap magnetic field is close to a square wave, and the induced electromotive force of the winding is a trapezoidal wave. Although this is conducive to the motor to generate a constant torque, the motor detects the commutation through the Hall element. The commonly used It is two-two conduction or three-three conduction mode, the commutation angle is 60°, the motor step-in angle is relatively large, and although the two-three conduction reduces the commutation angle by half, the torque is different, which affects to the load capacity of the permanent magnet brushless DC motor; in addition, the step angle of the motor in the above operation mode is relatively large, and it cannot be positioned more accurately

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
  • Operation method for stepping constant torque control on permanent magnet brushless direct current motor
  • Operation method for stepping constant torque control on permanent magnet brushless direct current motor
  • Operation method for stepping constant torque control on permanent magnet brushless direct current motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A. The device and operation used in the operation method:

[0058]The device used in the operation method of the constant torque step control of the permanent magnet brushless DC motor includes a DSP control module 1, a power circuit 2, a permanent magnet brushless DC motor 3, an encoder position detection module 4 and an input power supply module 5, wherein, The input power supply module 5 supplies power for the DSP control module 1, the power circuit 2 and the encoder position detection module 4, and the DSP control module 1, the power circuit 2, the permanent magnet brushless DC motor 3 and the encoder position detection module 4 are connected with wires in sequence , the encoder position detection module 4 is connected to the DSP control module 1 with wires; first, the input power supply module 5 supplies power to the DSP control module 1, the power circuit 2 and the encoder position detection module 4, and then the encoder position detection module 4 detects The ro...

Embodiment 2

[0075] In this embodiment, within a cycle period, the three-phase current is discrete according to the operation method of the present invention, and the number of cycles is b H = 24, when the current vector is 1 step ahead, the motor is controlled to run step by step, and the current vector is given a step forward every 0.1s, and the current-time curve of phase A of the motor is observed (see Figure 6 (1)), and the rotor step operation position- Time curve (referring to Fig. 6 (2)) and output electromagnetic torque-time curve (referring to Fig. 6 (3)), as can be seen from the result, the present embodiment follows the first step to the first step of the B operating method of embodiment 1 The current vector calculated in three steps is used to control the initial torque corresponding to each step. The electromagnetic torque is a constant value of 0.8Nm, and the rotor of the permanent magnet brushless DC motor 3 advances a mechanical step angle θ every time. bm = 7.5° process i...

Embodiment 3

[0077] In this embodiment, within a cycle period, the three-phase current is discrete according to the above-mentioned constant torque step control, and the number of cycles is b H =24, set the mechanical speed of the motor to 125r / min, and set the electromagnetic torque to T * = 3N m, adopt the advance step number k=6 to control, calculate the corresponding current vector according to the steps from the first step to the third step of the B operation method of embodiment 1, and obtain under the constant speed running state of the calculation and observation motor Phase A current-time curve ((see Figure 7(1)), rotor stepping position-time curve ((see Figure 7(2)) and output electromagnetic torque-time curve (see Figure 7(3)) The initial electromagnetic torque when the current vector is switched is the same. Due to the change of position, the electromagnetic torque will drop or rise, and it will change within ±0.4Nm according to a certain rule. Provides a relatively stable loa...

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 an operation method for stepping constant torque control on a permanent magnet brushless direct current motor, and relates to a motor control technology. A DSP (digital signal processing) control module in a device used in the method calculates a current vector required by control according to a set cyclic number of beats bH, a number of advancing steps k, a given electromagnetic torque T* and an amplitude value of a current vector (is) corresponding to different space positions and converts the current vector required by control into a logic level pulse width modulation signal by a current control method so as to control on and off of a switching tube of a three-phase bridge type inversion circuit in a power circuit, so that stepping constant-torque control on the permanent magnet brushless direct current motor is realized. According to the method, a stator current vector synthesized by three-phase current is dispersed at an electric angle space position according to a certain cyclic number of beats so as to obtain a dispersed current vector for controlling operation of the motor; by increase of the cyclic number of beats, a smaller stepping angle can be obtained, and the position resolution is improved; therefore, the positioning precision of the permanent magnet brushless direct current motor can be improved under the condition of guaranteeing the loading capacity.

Description

technical field [0001] The invention relates to a motor control technology, in particular to an operation method of constant torque step control of a permanent magnet brushless DC motor. Background technique [0002] A permanent magnet brushless DC motor is composed of a stator winding and a permanent magnet rotor without a commutator, and its control characteristics are similar to a brushed DC motor. Due to its advantages of large torque, high efficiency, high speed, simple control and easy maintenance, and with the development of power electronics technology, permanent magnet materials, digital electronics technology and new control theory, permanent magnet brushless DC motors are used in high The field of performance servo drives shows broad application prospects. However, due to the particularity of its structure, the distribution of its air gap magnetic field is close to a square wave, and the induced electromotive force of the winding is a trapezoidal wave. Although 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): H02P21/12
Inventor 孙鹤旭荆锴董砚郑易崔向宇梁涛雷兆明
Owner HEBEI UNIV OF TECH
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