Two-phase/three-phase mixed turn-on brushless direct-current motor PWM modulation method

A brushed DC motor and modulation method technology, applied in electronic commutator, torque ripple control and other directions, can solve the problem of less research on three-three conduction mode and two-three mixed conduction, and achieve rich speed control control way, good effect

Inactive Publication Date: 2017-08-18
YANSHAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, scholars mostly study the two-two conduction mode of brushless DC motors and the PWM modulation mode based on two-two conduction, and there are few studies on the three-three conduction mode and two-three mixed conduction.

Method used

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  • Two-phase/three-phase mixed turn-on brushless direct-current motor PWM modulation method
  • Two-phase/three-phase mixed turn-on brushless direct-current motor PWM modulation method
  • Two-phase/three-phase mixed turn-on brushless direct-current motor PWM modulation method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing:

[0021] The purpose of the present invention is based on the existing brushless DC motor control system, using DSP chip and Hall signal, through the direct logic of Hall signal and the timing and operation of DSP, each switch tube is turned on for 150 electrical angles. A brushless DC motor two-three mixed conduction mode is formed, and then the conduction signal of the switch tube during the three-three conduction period of the motor is added to PWM modulation to form a new PWM-ON-PWM-ON-PWM modulation method.

[0022] like figure 1 As shown, the two-to-two conduction of the brushless DC motor is a three-phase six-state. It means that only two power switch tubes are in the conduction state at any time. Every 60 degrees of electrical angle, the motor changes its working state once. Each switch The tubes are sequentially conducted through an electrical angle of 120 degrees. ...

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Abstract

The invention discloses a two-phase / three-phase mixed turn-on brushless direct-current motor PWM modulation method. The Hall signals of a brushless direct-current motor and the operation of a DSP chip are utilized to synthesize the driving signals of two-phase / three-phase mixed turn-on mode switching tubes, so that a 150-degree turn-on mode can be constructed; according to the 150-degree turn-on mode, in the operating process of the motor, each switching tube is turned on by 150 degrees and is made to operate stably; according to a two-phase / three-phase mixed turn-on mode, sectors are re-divided, twelve sectors each of which is of a 30-degree electrical angle are obtained; the driving signals of the two-phase / three-phase mixed turn-on mode switching tubes are subjected to PWM modulation, that is, the modulation signals of the switching tubes and high-frequency square waves are subjected to AND logic operation, and signals obtained after the logic operation are adopted as the driving signals of the switching tubes; and in a two-phase / two-phase turn-on period, the turn-on signals of the switching tubes are not subjected to any logic operation, and therefore, a constant turn-on state can be realized. According to the method of the invention, a brushless direct-current motor modulation mode is additionally adopted, and the advantages of two-phase / two-phase turn-on, three-phase and three-phase turn-on and PWM modulation are combined.

Description

technical field [0001] The invention relates to the field of brushless direct current motor control, in particular to a method based on two-two conduction and three-three conduction and PWM modulation of the brushless direct current motor. Background technique [0002] Brushless DC motors have attracted more and more attention because of their high power density and excellent speed regulation performance. At present, scholars mostly study the two-two conduction mode of brushless DC motors and the PWM modulation mode based on two-two conduction, and there are few studies on the three-three conduction mode and two-three mixed conduction. The two-two conduction mode is the 120-degree conduction mode, the three-three conduction mode is the 180-degree conduction mode, and the two-three conduction mode is the 150-degree conduction mode. [0003] There are five main PWM modulation methods for brushless DC motors, namely PWM-ON, ON-PWM, HPWM-LON, HON-LPWM, HPWM-LPWM. Most of these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P6/17
CPCH02P6/10
Inventor 郭忠南李昕闫朝阳张纯江吕昌昊
Owner YANSHAN UNIV
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