Method and device for controlling air volume of a motor

Abstract

The invention provides a controlling method and device for motor air volume. The controlling method for the motor air volume comprises the following steps that preset required air volume is obtained; a preset driving signal and a preset rotating speed which reach the preset required air volume under static pressure are obtained according to relationship between the air volume and the driving signal and the rotating speed under the prestored static pressure; a motor is driven by utilizing the preset driving signal; whether the actual rotating speed of the motor after the rotating speed of the motor is stable is equal to the preset rotating speed or not is judged; and if the actual rotating speed is not equal to the preset rotating speed, the driving signal of the motor is adjusted according to the relationship between the air volume and the driving signal and the rotating speed under the prestored static pressure. According to the technical scheme, the static pressure of the part of an air outlet of the motor is not required to be detected, so that any related sensor is not required to be added, controlling cost is reduced, the condition that the sensor is failure does not exist, and efficiency and accuracy of air volume controlling of the motor are improved.

Description

technical field [0001] The invention relates to the technical field of home appliances, in particular to a motor control method and device. Background technique [0002] The range hood is a kitchen appliance that purifies the kitchen environment. It is mainly composed of an organic shell, a flue, a motor, a check valve, an oil collection and discharge device, a lighting device, a power switch, and a power cord. It is installed above the healthy and energy-saving range hood stove in the kitchen. It can quickly take away the waste burned by the stove and the oil fume harmful to the human body produced during the cooking process, and discharge it to the outside, reduce pollution, purify the air, and have anti-virus and explosion-proof safety guarantees. effect. At present, range hoods generally use a constant speed or constant current method or a traditional AC motor to control the exhaust of the range hood. However, in actual use, due to factors such as the length of the smo...

AI Technical Summary

Problems solved by technology

However, in actual use, due to factors such as the length of the smoke pipe, bending conditions, and differences in the resistance of the public flue, the static pressure at the outlet of the range hood changes complicatedly. The traditional control method will result in insufficient output air volume due to changes in static pressure. , the oil fume effect is poor

[0003] Adopting the constant air volume control method can ensure a better oil suction effect. The existing constant air volume control scheme generally uses an air volume sensor or a static pressure sensor to directly test the air volume or static pressure at the tuyere. cost, and there is a risk of sensor failure, affecting control efficiency

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