Wide speed regulation range and low torque ripple suppression method of brushless direct current motor

A brush DC motor and torque ripple technology, which is applied in torque ripple control, direct torque control, motor control, etc., can solve the problem of low torque ripple suppression method with wide speed regulation range and poor commutation torque ripple suppression effect and other problems, to achieve the effect of fast torque response, increased attenuation, and strong controllability

Inactive Publication Date: 2018-09-25
JIANGSU UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the commutation torque ripple suppression effect is poor when the direct torque control of the brushless DC motor is

Method used

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  • Wide speed regulation range and low torque ripple suppression method of brushless direct current motor
  • Wide speed regulation range and low torque ripple suppression method of brushless direct current motor
  • Wide speed regulation range and low torque ripple suppression method of brushless direct current motor

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Embodiment Construction

[0044] Such as figure 1 As shown, the present invention aims to solve the problem that the torque ripple suppression effect of the brushless DC motor is not ideal within a wide speed regulation range. figure 1 Is the direct torque two-point regulation process diagram. where T g is the torque given value, T f is the torque feedback value, ΔT is the torque error, T Q is the torque switch signal. The tolerance of the regulator is ±ε m , using a discrete two-point adjustment method. at time t 1 , ΔT≤—ε m ,T Q Output "1". When T Q =1, select a non-zero voltage space vector in combination with the position signal, at this time the stator flux linkage rotates forward, T f rise, ΔT increases; to time t 2 , ΔT increases to the upper limit of the tolerance + ε m , that is, ΔT≥+ε m ,T Q Output "0". When T Q =0, the zero-voltage space vector is added to the motor, and the stator flux linkage is stationary, T f Decrease, ΔT decreases.

[0045] Such as figure 2 As shown...

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Abstract

The invention relates to the wide speed regulation range and low torque ripple suppression method of a brushless direct current motor. A rotating-speed and torque double-closed-loop control mode is adopted. At a non-commutation moment, torque control is performed. At a commutation moment, overlapping commutation is performed and a current prediction module is added to carry out duty ratio calculation. When a Hall position signal jump sign commutation begins, a turn-off phase current decreases to zero and sign commutation is ended. At this time, an overlapping commutation method is adopted; andin order to reflect the current of a non-commutation phase on a direct current bus during a delayed turn-off period, the measure of using turn-off phase and non-commutation phase synchronization PWMmodulation to open phase constant open is adopted during a commutation period. Simultaneously, a non-commutation phase current value and a motor rotation speed at a current moment which is a k momentare sampled, according to the operation state of the motor at the current moment which is the k moment, a three-phase winding opposite electromotive force is acquired, a current prediction control module is used to calculate a prediction control law D so as to control inversion circuit output, and the torque ripple suppression of the brushless direct current motor under a wide speed regulation range is realized.

Description

technical field [0001] The invention relates to a brushless direct current motor with wide speed regulation range and low torque ripple suppression, and belongs to the field of permanent magnet brushless direct current motor control. Background technique [0002] As a kind of permanent magnet motor, brushless DC motor not only has the advantages of simple structure, low manufacturing cost, simple and economical maintenance and repair of AC motor, but also has the advantages of large output, good starting and speed regulation performance of DC motor, and brushless DC motor The use of electronic commutator avoids the disadvantages of traditional mechanical brushes. Therefore, brushless DC motors are widely used in various fields of national production such as aerospace, automotive electronics, industrial production, and household appliances. But the most serious problem of brushless DC motor is the torque ripple caused by the processing technology and motor performance. Torq...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/14H02P23/14H02P23/30
CPCH02P6/10H02P6/14H02P23/14H02P2207/05H02P23/30
Inventor 孙玉坤张宽袁野黄永红朱志莹孟高军
Owner JIANGSU UNIV
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