Starting control method of extractor hood and extractor hood applying starting control method

Abstract

The invention relates to a starting control method of an extractor hood. The starting control method comprises the following steps that in the starting process of a fan, when the rotating frequency corresponding to the rotating speed of the fan is close to the resonant frequency, the power supply voltage of the fan is controlled to be increased until the rotating frequency corresponding to the rotating speed of the fan exceeds the resonant frequency so as to recover the power supply voltage of the fan. According to the starting control method of the extractor hood, the rotating speed near the resonance frequency can be increased, so that passing of resonance frequency points is accelerated, and vibration at modal weak points of the extractor hood is reduced. The invention further relates to the extractor hood which comprises a shell and the fan, the fan comprises a volute, an impeller and a motor, a rotating shaft of the motor is sleeved with a fixing ring, a permanent magnet is arranged on the fixing ring, at least two coils capable of being mutually induced with the permanent magnet are arranged on the periphery of the rotating shaft of the motor, a first acceleration sensor is arranged at the position, close to a volute tongue, of the volute, and a second acceleration sensor is arranged on the rear portion of a shell top plate. The extractor hood can weaken vibration in the starting process and abnormal noise caused by vibration.

Description

technical field [0001] The invention relates to a start-up control method of a range hood, and also relates to a range hood applying the start-up control method. Background technique [0002] Since the range hood entered China in the 1990s, it has become an indispensable kitchen appliance for ordinary people. Its main function is to inhale the cooking fume generated by the user through the fan system impeller from the air inlet, use the air inlet filter and impeller to filter the fume, and discharge the filtered fume from the air outlet, thereby completing the purification of the kitchen environment. As the core component of the range hood, the fan system, rational configuration of its structure has an important impact on improving the effect of the range hood, reducing the escape of the range hood, and improving the air quality in the kitchen. [0003] At present, range hoods on the market generally use AC motors, and although the range hoods using this type of motor have ...

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Problems solved by technology

[0003] At present, range hoods on the market generally use AC motors, and although the range hoods using this type of motor have the characteristics of simple structure and low cost, they use a relatively simple starting method when controlling the start of the fan system, that is, directly energize Accelerate the motor to near the target speed. There is no special control for the start-up process. During the speed-up process of the motor, the motor is equivalent to the excitation source, and the vibration points below the target speed will be excited, and the range hood is mostly made of sheet metal materials. , the weak mode below its working point will vibrate violently. Although the vibration only occurs during the start-up process, the noise of the whole machine at this time is low, so it is easier to be perceived by the user, which greatly affects the user experience and reduces the customer experience. to experience

[0004] At present, for the vibration and abnormal sound caused by the range hood during the start-up process, the same vibration-avoiding strategy as that of the range hood in the working state is mostly adopted in the market, that is, the weak mode is strengthened to reduce the noise caused by the speed point. This strategy has a better effect on the severe vibration caused by being close to the resonance point, because the normal operating point of the motor has a small change in speed, and there are many resonance points that need to be avoided during the start-up of the range hood. more difficult

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