Method and system for suppressing torque ripple of brushless DC motor

A technology of brush DC motor and torque ripple, applied in the direction of torque ripple control, etc., can solve the problems of high cost, low control efficiency, and inconspicuous suppression of torque ripple, and achieve better suppression effect and torque ripple suppression Effect

Active Publication Date: 2020-05-22
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PWM chopping method has the following defects: the control efficiency is low, the dead time needs to be added and the suppression of torque ripple is not obvious due to the addition of the dead time, and different duty ratios need to be calculated according to different PWM modulation methods , the detection method and control algorithm are complicated, the calculation is difficult, and the cost is high

Method used

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  • Method and system for suppressing torque ripple of brushless DC motor
  • Method and system for suppressing torque ripple of brushless DC motor
  • Method and system for suppressing torque ripple of brushless DC motor

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Embodiment one, as figure 1 As shown, a brushless DC motor torque ripple suppression system includes a voltage source inverter 2, a controller 4 and a sampling circuit 5;

[0071] The voltage-type inverter 2 is used to control the opening and closing of each phase of the brushless DC motor 3;

[0072] The sampling circuit 5 is used to collect the three-phase phase current during the operation of the brushless DC motor 3, and send the collected three-phase phase current to the controller 4;

[0073] The controller 4 is used to receive the three-phase phase current and the Hall signal collected by the Hall sensor of the brushless DC motor 3; Whether the brushless DC motor 3 is in the commutation state, when the judgment result is no, adopt the two-two conduction control mode to control the voltage type inverter, and when the judgment result is yes, use the two-two conduction and three-three The conduction switching control mode controls the voltage source inverter.

[...

Embodiment 2

[0140] Embodiment two, such as Figure 7 Shown, a kind of suppression method of brushless DC motor torque ripple, it adopts the suppression system of brushless DC motor torque ripple of the present invention, comprises the following steps:

[0141] S1: Obtain the Hall signal collected by the Hall sensor in the brushless DC motor and the three-phase phase current during the operation of the brushless DC motor, and according to the Hall signal and the The three-phase phase current determines whether the brushless DC motor is in the commutation state, if not, enters S2, and if so, enters S3;

[0142] S2: controlling the voltage source inverter by using the pairwise conduction control method;

[0143] S3: Controlling the voltage source inverter by using the two-two conduction and three-three conduction switching control mode.

[0144] In the commutation stage, the two-two conduction control method is adopted first. Since the current of the inductance cannot change suddenly in th...

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Abstract

The invention relates to a method and system for suppressing torque ripple of a brushless DC motor. The method includes acquiring a Hall signal collected by a Hall sensor in the brushless DC motor and a three-phase current during the operation of the brushless DC motor, and Judging whether the brushless DC motor is in the commutation state according to the Hall signal and the three-phase phase current, if not, use the two-two conduction control method to control the voltage-type inverter; if so, use the two-two conduction and three-three conduction switching The control mode controls the voltage source inverter. In the phase commutation stage, the present invention switches the control mode between two-two conduction and three-three conduction, and only one switching tube changes, which effectively suppresses the torque ripple generated by the brushless DC motor during phase commutation; and due to the two-two conduction control The mutual cooperation between the three-three conduction control method and the three-three conduction control method does not need to set the dead zone, the torque ripple suppression effect is better, the detection method and control algorithm are simpler, the calculation difficulty is lower, the cost is lower, and the control efficiency is higher. .

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and system for suppressing torque ripple of a brushless DC motor. Background technique [0002] After years of development, motors have been used in all aspects of modern society. DC motors are increasingly used in electric drive systems due to their excellent regulation and start-up performance. Brushless DC motors are developed on the basis of brushed DC motors. my country's reserves of permanent magnet materials are very rich, so it has laid a good material foundation for the development of brushless DC motors. Due to the maturity of the processing level of permanent magnet materials and the improvement of control circuit technology, brushless DC motors have been widely used in various fields and links of modern society and national economy. Brushless DC motors have the advantages of simple structure, high power density, and long service life, so they are wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10
Inventor 李自成孔庆尧王后能曾丽熊涛
Owner WUHAN INSTITUTE OF TECHNOLOGY
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