Direct current fan control method and system

Abstract

The invention discloses a direct current fan control method and system. The method comprises the steps of obtaining the target air volume; obtaining the lower-limit air volume and the upper-limit air volume of a range within which the target air volume is located so that a proportionality coefficient can be obtained; collecting the current rotating speed and a torque current of a driving motor; according to the current rotating speed and the torque current, obtaining a low air volume torque current and a high air volume torque current through the lower-limit air volume and the upper-limit air volume; and according to the proportionality coefficient, the low air volume torque current and the high air volume torque current, obtaining a target torque current so that a direct current fan can be controlled to operate according to the target torque current. By means of the control method, the target torque current can be determined according to the target air volume, the current rotating speed and the torque current, and thus the direct current fan is controlled according to the target torque current; the purpose of constant air volume output is achieved; control precision is improved; and the direct current fan control method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a control method and a control system of a DC fan. Background technique [0002] In related technologies, the constant air volume control of DC fans is mainly based on mathematical models, that is, by measuring the operating characteristics of the fan system, which includes a number of parameters, such as current, speed, power, etc., to establish a mathematical model and establish it in the main controller of the system. The algorithm of its model realizes the purpose of controlling the constant air volume of the DC fan. [0003] However, if you want to achieve high-precision control of air volume, you must establish an accurate mathematical model, which will lead to the complexity of the algorithm of the mathematical model, such as higher order and more variables, which will lead to high-precision mathematical models in It is difficult to implement on single-chip microcomputer o...

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Problems solved by technology

[0003] However, if you want to achieve high-precision control of air volume, you must establish an accurate mathematical model, which will lead to the complexity of the algorithm of the mathematical model, such as higher order and more variables, which will lead to high-precision mathematical models in It is difficult to implement on single-chip microcomputer or DSP, but the simple mathematical model is used at the expense of precision, which limits the control precision of constant air volume and cannot well meet the requirements of use, and needs to be improved

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