Range hood rotating speed control method and device

Abstract

The present invention discloses a range hood rotating speed control method and device, wherein the method comprises a step A of obtaining the current operation rotating speed of a DC motor in a range hood under the driving of a current pulse width modulation signal; a step B of calculating the difference value of the current rotating speed of the DC motor and a preset target rotating speed; a step C of determining whether the difference value is within a preset threshold value range; a step D of when the difference value is outside the preset threshold value range, adjusting the current pulse width modulation signal according to a preset rule and driving the DC motor to operate with the adjusted pulse width modulation signal; a step E of when the difference value is within the preset threshold value range, determining a calibration value of the range hood according to the current pulse width modulation signal, and exiting a calibration mode. According to the present invention, the technical problem in the prior art that the rotating speed deviation of the range hood is large on the same working condition, so that the performance index consistency of the range hood can not be guaranteed, is solved.

Description

technical field [0001] The invention relates to the technical field of range hoods, in particular to a method and device for controlling the rotational speed of a range hood. Background technique [0002] Most traditional range hood products use AC tapped motors. However, due to factors such as their basic structure and working principle, AC tapped motors have disadvantages such as relatively low power indicators (such as efficiency and power factor) and relatively large electromagnetic noise. The brushless DC motor uses rare earth permanent magnets for excitation and does not require excitation power. Compared with AC tapped motors, it has the advantages of high efficiency, low power, and convenient speed adjustment, so it is gradually applied to range hood products. [0003] Since range hoods have different air duct resistances in different applications, it is necessary to use open-loop control to control the brushless DC motor of the range hood, that is, only provide a fi...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a method and device for controlling the speed of a range hood, at least to solve the problem that in the prior art, the consistency of performance indicators of the range hood cannot be guaranteed due to the large deviation of the speed of the range hood under the same working condition technical issues

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