Stepless constant-air volume control method and device of fan, and fan

Abstract

The invention discloses a stepless constant-air volume control method and control device of a fan, and the fan. The stepless constant-air volume control method of the fan comprises the steps that a target constant air volume value of the fan is acquired; a target torque of the fan is determined according to the target constant air volume value, and the fan is controlled to operate under the targettorque; the actual rotating speed and the actual torque of the fan during operation are acquired; the air volume and air pressure of the fan are worked out according to the actual rotating speed andthe actual torque of the fan during operation, and a target rotating speed range of the fan is worked out according to the air volume and air pressure of the fan and a preset stepless constant-air volume mathematic model; a current compensation value required by the fan to reach the target rotating speed range is determined, and current compensation is conducted according to the current compensation value to control the fan to constantly output an air volume at the target constant air volume value. According to the stepless constant-air volume control method and control device of the fan, andthe fan, complex test procedures and a large quantity of calculation in the process of fitting an air volume and air pressure characteristic curve are reduced, and the capacity of the fan to output aconstant air volume under different air pressures is improved.

Description

technical field [0001] The invention relates to the technical field of fans, in particular to a method for controlling a stepless constant air volume of a fan, a fan control device and a fan. Background technique [0002] With the continuous improvement of living standards, people are paying more and more attention to environmental comfort and energy-saving requirements. Constant air volume control has become an indispensable part of the fan field, and major manufacturers are constantly optimizing fans. Since the static pressure will change with the different installation methods of the fan duct or the dust accumulation in the air duct, the constant air volume control of the fan can achieve a constant output of constant air volume within a wide range of static pressure to maintain a comfortable ventilation effect. [0003] Some existing technical solutions measure the air volume by installing an air volume detection sensor in the air outlet or the air duct, so as to realize...

AI Technical Summary

Problems solved by technology

The air volume detection sensor itself is expensive, and the actual installation and wiring are cumbersome, inconvenient installation, high hardware cost, and there is also the risk of measurement failure or inaccuracy due to the failure of the air volume detection sensor

In addition, the constant air volume control scheme without air volume detection sensor installed in the prior art can only realize one or several constant air volume curves, and each air volume characteristic curve requires detailed testing and a large number of complex calculations, resulting in a very complicated design. Relatively low control accuracy and high implementation cost

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