Range hood

Abstract

The invention provides a range hood which comprises a direct current motor in a closed-loop connection, a direct current motor back electromotive force (BEMF) detecting unit, a main control unit, a motor drive unit, a low-voltage converter and a high-voltage converter, wherein the main control unit is used for regulating duty ratio of output according to the BEMF of the direct current motor detected by the direct current motor BEMF detecting unit; the motor drive unit is used for driving the direct current motor to achieve constant torque operation according to the duty ratio output by the main control unit; the low-voltage converter is connected between an external power supply and the main control unit; and the high-voltage converter is connected between the external power supply and the motor drive unit. According to the range hood, electrodeless speed change of air volume and saving of power consumption are achieved due to the adoption of the direct current motor.

Description

technical field [0001] The invention relates to a range hood, in particular to a range hood using a DC frequency conversion motor. Background technique [0002] With the development of technology, the current motor development direction is mainly towards the direction of green, low carbon and low noise, especially the frequency conversion technology has become the trend of the home appliance industry. However, most of the variable frequency motors in the range hood market are AC variable frequency motors. Because AC variable frequency motors require external excitation and high excitation loss, the following problems are caused. At present, most AC motors have three-speed speed regulation, which cannot satisfy users to choose a suitable one. Speed, such as cooking porridge or soup does not require a higher speed of the motor, resulting in unnecessary waste. Nowadays, energy saving has become the development direction of home appliances in the future. Range hoods are also ap...

AI Technical Summary

Problems solved by technology

However, most of the variable frequency motors in the range hood market are AC variable frequency motors. Because AC variable frequency motors require external excitation and high excitation loss, the following problems are caused. At present, most AC motors have three-speed speed regulation, which cannot satisfy users to choose a suitable one. Speed, such as cooking porridge or soup, etc. do not require a higher speed of the motor, which will cause unnecessary waste

Today, energy saving has become the development direction of home appliances in the future. The range hood is also an electrical appliance that is used every day in the family. Although it is not used for a long time each time, due to the low efficiency of the AC motor currently used, the energy consumption is still large.

Images