Range hood

A technology of range hood and DC motor, applied in the direction of speed/torque control of a single motor, can solve the problems of high energy consumption, low efficiency of AC motor, and high excitation loss

Active Publication Date: 2012-09-12
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 n

Method used

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Embodiment Construction

[0020] Attached below Figure 1-5 The range hood of the present invention is described. like figure 1 As shown, the range hood includes a low-voltage converter 11 and a high-voltage converter 12 connected to an external power supply 10; a main control unit 13 connected to the low-voltage converter 11; an air curtain motor 16 connected to the main control unit 13, a control panel 17, The indicator light 18 and the motor drive unit 14, as well as the DC motor 15 connected with the motor drive unit 14.

[0021] The low-voltage converter 11 is used to convert the external 220V voltage into a low voltage for driving the main control unit 13 to work. like Figure 5 As shown, the function of the low-voltage converter 11 is realized by a circuit including an M51995 chip. Wherein, between the M51995 chip and the DSPIC30F3010 chip in the main control unit 13 described later, resistors R1 to R5 are sequentially connected in series, and the resistor R5 is a sampling resistor for colle...

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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...

Claims

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Application Information

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IPC IPC(8): H02P6/08
Inventor 徐文冰许升吴家良王兆贤陈玉玲李良
Owner HAIER GRP CORP
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