Non-inductive boost topological driving brushless DC motor commutation torque ripple suppression method

A technology of brush DC motor and fluctuation suppression, applied in the direction of torque ripple control, electronic commutator, etc., can solve the problem of multiple power switches in the front-stage DC-DC converter, increase the size and cost of the drive system, and prolong the commutation process time and other problems, to achieve the effect of shortening the commutation process time, fewer power devices, and simple topology

Active Publication Date: 2017-09-29
TIANJIN UNIV
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Problems solved by technology

[0004] However, there are still some problems in the existing commutation torque fluctuation suppression methods: For the PWM method, when the motor is running at a higher speed below the rated speed, under the limited inverter DC side voltage limit, this type of method cannot It is to suppress the commutation torque fluctuat

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  • Non-inductive boost topological driving brushless DC motor commutation torque ripple suppression method
  • Non-inductive boost topological driving brushless DC motor commutation torque ripple suppression method
  • Non-inductive boost topological driving brushless DC motor commutation torque ripple suppression method

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Embodiment Construction

[0043] The method for suppressing the commutation torque ripple of the brushless DC motor driven by the non-inductive boost topology of the present invention will be described in detail below in conjunction with the embodiments and the drawings.

[0044] Such as figure 1 Shown. The method for suppressing commutation torque fluctuation of a brushless DC motor driven by a non-inductive boost topology of the present invention is a control method that judges and selects a non-commutation area or a commutation area through a working interval. In the non-commutation area, the output voltage of the non-inductive DC-DC boost topology is adjusted under the premise of ensuring the normal speed regulation of the motor by reasonably selecting the working mode. In the commutation area, the output voltage of the non-inductive DC-DC boost topology is used, and the unified switching vector is adopted to suppress the commutation torque fluctuation and shorten the commutation time.

[0045] The me...

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Abstract

The invention provides a non-inductive boost topological driving brushless DC motor commutation torque ripple suppression method. A non-inductive DC-DC converter is designed to be additionally arranged before a three-phase voltage source inverter so that the overall system forms a non-inductive boost topological three-phase voltage source inverter driving circuit; the effect of different switching vectors on the motor input voltage and the non-inductive DC-DC converter output voltage is analyzed; when a brushless DC motor operates in the non-commutation stage, three working modes of a normal mode, a boost mode and a buck mode are designed according to the effect of the switching vectors; the output voltage of the DC-DC converter is regulated under the premise of guaranteeing normal speed regulation of the brushless DC motor by selecting three working modes; and when the brushless DC motor operates in the commutation stage, the two fixed switching vectors are adopted to suppress the commutation torque ripple of the brushless DC motor. The size and the cost of the driving system can be greatly saved, and the time of the commutation process can be effectively shortened in suppressing the commutation torque ripple so that the reliability of motor operation can be enhanced.

Description

Technical field [0001] The invention relates to a brushless DC motor. In particular, it relates to a method for suppressing commutation torque ripple of a brushless DC motor driven by a non-inductive boost topology. Background technique [0002] Brushless DC motors are widely used in industrial control, aerospace and electric vehicles due to their simple structure, high power density and stable and reliable operation. However, because the motor inductance and the limited inverter voltage hinder the rapid change of the phase current during the commutation process, the motor generates large torque fluctuations during the commutation process, and the maximum commutation torque fluctuation can reach the average torque. 50%. The commutation torque fluctuation will cause vibration and noise of the motor system, and reduce the load capacity of the motor, which is one of the main problems that limit the high-performance operation of the brushless DC motor. [0003] In recent years, scho...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/14
Inventor 夏长亮姜国凯李新旻陈炜史婷娜
Owner TIANJIN UNIV
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