WO2012081929A2 - Air purifier and fan control method thereof - Google Patents

Air purifier and fan control method thereof Download PDF

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Publication number
WO2012081929A2
WO2012081929A2 PCT/KR2011/009712 KR2011009712W WO2012081929A2 WO 2012081929 A2 WO2012081929 A2 WO 2012081929A2 KR 2011009712 W KR2011009712 W KR 2011009712W WO 2012081929 A2 WO2012081929 A2 WO 2012081929A2
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WO
WIPO (PCT)
Prior art keywords
fan
operating
operating speed
fan motor
air purifier
Prior art date
Application number
PCT/KR2011/009712
Other languages
English (en)
French (fr)
Other versions
WO2012081929A3 (en
Inventor
Wang-Jun Lee
Joong-Bae Shin
Gue-Ryang Lee
Original Assignee
Woongjin Coway Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Woongjin Coway Co., Ltd filed Critical Woongjin Coway Co., Ltd
Priority to JP2013544398A priority Critical patent/JP5725385B2/ja
Publication of WO2012081929A2 publication Critical patent/WO2012081929A2/en
Publication of WO2012081929A3 publication Critical patent/WO2012081929A3/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to an air purifier including a plurality of fans, and a control method for fan motors thereof.
  • An air purifier is a device designed to purify indoor air by removing a variety of dust particles and bacteria therefrom or by deodorizing indoor air by removing the smell of cigarettes, the smell of sweat, and so on.
  • Such an air purifier includes a fan unit for drawing in indoor air and forcibly expelling the indrawn air; and a filter member for filtering dust particles or bacteria or deodorizing indoor air by removing odors in the air circulated indoors by the operation of the fan unit.
  • the fan unit is provided with a motor and a fan. When the motor is rotated, the fan draws indoor air into, and discharges indoor air from, the air purifier.
  • the filter member is provided with a plurality of filters. When the air passes through the air purifier by the operation of the fan unit, the filters deodorize smells and filter dust particles or bacteria contained in the air through dust collection or the like.
  • the fan may be an impeller fan or a sirocco fan.
  • Recent air purifiers are provided with a filter member that generates anions. Such an air purifier supplements naturally-present anions reduced by the pollution of indoor air, which may provide a pleasant indoor environment.
  • a fan unit is configured such a manner that a single motor may be coupled to a single fan, or a single motor may be coupled to two fans. Therefore, the air cleaning efficiency of the air purifier may be lowered.
  • the fan of the fan unit is provided with an impeller fan, noise and vibrations may be seriously generated during the operation of the air purifier.
  • An aspect of the present invention provides an air purifier including a plurality of fans and a fan control method thereof.
  • a fan control method of an air purifier including: an operating mode determining process of determining an operating strength of the air purifier; a first fan motor driving process of operating a first fan motor at a first operating speed corresponding to the operating strength, such that a fan coupled to the first fan motor is rotated; and a second fan motor driving process of operating a second fan motor at a second operating speed altered from the first operating speed by a preset value, such that a fan coupled to the second fan motor is rotated.
  • the preset value may be determined in consideration of at least one of a load amount of the fan motors, a size of the fans, and a configuration of the air purifier.
  • the second fan motor may be operated after a preset period of time has elapsed from the initiation of the operation of the first fan motor.
  • the second fan motor driving process may be performed first, and the first fan motor driving process may be then performed after a preset period of time has elapsed.
  • the preset period of time may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motors.
  • a fan control method of an air purifier including: an operating mode determining process of determining an operating strength of the air purifier; an operating speed setting process of setting a first operating speed and a second operating speed as operating speeds of a plurality of fan motors provided in the air purifier, wherein the first operating speed corresponds to the operating strength, and the second operating speed is determined by changing the first operating speed by a preset value; and a driving process of operating the fan motors at the set operating speed and rotating the fans coupled to the fan motors.
  • the preset value may be determined in consideration of at least one of a load amount of the fan motors, a size of the fans, and a configuration of the air purifier.
  • the driving process may include: a first fan motor operating process of operating a first fan motor rotating at the first operating speed; and a second fan motor operating process of operating a second fan motor rotating at the second operating speed after a preset period of time has elapsed.
  • the preset period of time may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motors.
  • the driving process may include: a second fan motor operating process of operating a second fan motor rotating at the second operating speed; and a first fan motor operating process of operating a first fan motor rotating at the first operating speed after a preset period of time has elapsed.
  • a fan control method of an air purifier including: a stopping determining process of determining fan motors to be stopped among a plurality of fan motors; and a first fan motor stopping process of stopping any one of the fan motors to be stopped; and when the number of the fan motors to be stopped is two or more, a second fan motor stopping process of stopping another one of the fan motors to be stopped, after a preset period of time has elapsed from the initiation of the stopping of the first motor.
  • the second fan motor stopping process may be performed repetitively until the fan motors to be stopped are all stopped.
  • the preset period of time may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motors.
  • an air purifier including: a plurality of fan motors configured to operate at operating speeds set according to a control signal; a plurality of fans coupled to the fan motors to rotate to form air flow; and a controller configured to set the operating speeds for the plurality of fan motors and transmit the control signal corresponding to the operating speeds to the fan motors.
  • the controller may receive an operating strength of the air purifier and set a first operating speed and a second operating speed as the operating speeds of the plurality of fan motors, wherein the first operating speed corresponds to the received operating strength, and the second operating speed is determined by changing the first operating speed by a preset value.
  • the controller may first operate the fan motors set to the first operating speed, and then operate the fan motors set to the second operating speeds after a preset period of time has elapsed.
  • an air purifier uses a plurality of fan motors. Therefore, the performance of the air purifier may be improved, and noise caused by resonance between the plurality of fan motors may be removed.
  • FIGS. 1A and 1B are views illustrating examples of an air purifier, to which a fan control method according to an exemplary embodiment of the present invention is applied;
  • FIG. 2 is a side view illustrating a case in which an air purifier including a plurality of fan motors is mounted on a wall;
  • FIGS. 3A and 3B are graphs showing an analysis result of noise spectrums of an air purifier using a single fan motor and an air purifier using a plurality of fan motors;
  • FIGS. 4A and 4B illustrate noise spectrums in a case in which an air purifier using a single fan motor and an air purifier using two fan motors are operated in a maximum operating mode at the same operating speed and at different operating speeds;
  • FIGS. 5A and 5B are flowcharts illustrating a control flow of a fan control method of an air purifier, according to an exemplary embodiment of the present invention
  • FIG. 6 is a flowchart illustrating a control flow of a fan control method of an air purifier, according to another exemplary embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a control flow when a fan motor of an air purifier is stopped, according to an exemplary embodiment of the present invention.
  • FIGS. 1A and 1B are views illustrating examples of an air purifier to which a fan control method according to an exemplary embodiment of the present invention is applied.
  • an air purifier to which a fan control method according to an exemplary embodiment of the present invention is applied, may discharge air to both sides thereof and may be mounted on a wall.
  • an air purifier to which a fan control method according to an exemplary embodiment of the present invention is applied, may be provided with a plurality of fans and a plurality of fan motors.
  • noise may be generated when the plurality of fan motors are operated at the same or a similar speed, as opposed to a case in which a single motor is used.
  • Such a noise may have a frequency band that may inconvenience users.
  • FIG. 2 is a side view illustrating a case in which an air purifier including a plurality of fan motors is mounted on a wall.
  • a resonance area (a hatched area) 12 may be formed between the air purifier 10 and the wall.
  • the resonance area 12 is formed when the air purifier 10 is spaced apart from the wall by a support 11.
  • the resonance area 12 is inevitably formed because the air purifier 10 cannot be entirely attached to the wall.
  • the air purifier 10 may be spaced apart from the wall in order that air discharged from an air outlet port 12 is not disturbed by the wall.
  • noise generated by the fan motors may be resonated within the resonance area 12. If the noise generated by the fan motors is resonated within the resonance area 12, a magnitude of the noise is larger than that of noise generated by an operation of a typical fan motor, which may cause inconvenience to an air purifier user.
  • a plurality of fans having the same performance may be used for the stability of products.
  • the fan motors are operated at the same speed, it may be highly likely that noise generated by the fan motors will cause resonance in an inner space of an air purifier housing.
  • FIGS. 3A and 3B are graphs showing an analysis result of noise spectrums of an air purifier using a single fan motor and an air purifier using a plurality of fan motors.
  • FIG. 3A is a graph showing a comparison of noise spectrums when the air purifier is operated in a minimum operating mode, that is, a silent mode.
  • S1 represents a noise spectrum of the air purifier using a single fan motor
  • S2 represents a noise spectrum of the air purifier using a plurality of fan motors.
  • S1 has a higher decibel than S2 in general.
  • a load amount applied to one fan motor is reduced. Accordingly, the air purifier may be operated silently.
  • noise spectrum S2 it can be seen from the noise spectrum S2 that a louder noise is generated in a 3-kHz frequency band, as compared to other frequency bands.
  • the plurality of fan motors when used, much more noise may be generated in a 3-kHz frequency band (an audio frequency band).
  • the intensity of noise may be negligibly low.
  • FIG. 3B is a graph showing a comparison of noise spectrums when the air purifier is operated in a maximum operating mode.
  • S3 represents a noise spectrum of the air purifier using a single fan motor
  • S4 represents a noise spectrum of the air purifier using a plurality of fan motors.
  • a louder noise is generated in a 3-kHz frequency band, as compared to other frequency bands.
  • the intensity of noise is significantly high in the 3-kHz frequency band, as compared to other frequency bands.
  • noise in an audio frequency band is generated remarkably strongly, which may bother users. If uniform noise is generated across the entire frequency band, noise may not be recognized as serious, as in the case of white noise. Therefore, as illustrated in FIG. 3B, if a loud noise is generated in a specific frequency band, it may cause considerable emotional inconvenience to users.
  • a control method for changing operating speeds of a plurality of fan motors in an air purifier is proposed. Differences between the operating speeds of the fan motors may be determined in a range that does not affect an air cleaning function of the air purifier.
  • Table 1 below shows exemplary operating speeds of fan motors in operating modes of the air purifier when the plurality of fan motors are controlled at the same speed.
  • the operating speeds of the fan motors correspond to the operating modes. In the maximum operating mode, considerable noise may be generated because the fan motors are operated at a very high speed, as compared to the silent mode.
  • FIG. 4A illustrates noise spectrums in a case in which an air purifier using a single fan motor and an air purifier using two fan motors are operated at an operating speed corresponding to the third gear mode of Table 1 above.
  • S5 represents a noise spectrum of the air purifier using a single fan motor
  • S6 represents a noise spectrum of the air purifier using two fan motors.
  • differences in the operating speeds of the first fan motor and the second fan motor are 50 RPM in each operating mode.
  • the differences in the operating speeds of the first fan motor and the second fan motor are not necessarily 50 RPM and may be determined in consideration of at least one of a load amount of a fan motor, a size of a fan, or a configuration of an air purifier.
  • noise may be generated because the air purifier is vibrated by an unbalanced operation of the fan motor. Therefore, there is a need to pay attention to this situation.
  • FIG. 4B illustrates noise spectrums in a case in which an air purifier using a single fan motor and an air purifier using two fan motors are operated at an operating speed corresponding to the third gear mode of Table 2 above.
  • S7 represents a noise spectrum of the air purifier using a single fan motor
  • S8 represents a noise spectrum of the air purifier using two fan motors.
  • FIGS. 5A and 5B are flowcharts illustrating fan control methods of an air purifier according to exemplary embodiments of the present invention.
  • a fan control method of an air purifier may include an operating mode determining process S10, a first fan motor driving process S20, and a second fan motor driving process S30.
  • the fan control method according to the exemplary embodiment of the present invention may be applied to an air purifier including a plurality of fans and a plurality of fan motors, which are coupled to the fans and drive the same.
  • an operating strength of the air purifier may be determined.
  • the operating strength may be set automatically or may be information input by a user.
  • a fan motor coupled to one of the fans may be operated at an operating speed corresponding to the operating strength.
  • One of the plurality of fan motors that is, the first fan motor, may be selected and operated at a first operating speed corresponding to the operating strength.
  • the fan coupled to the first fan motor may also be rotated.
  • a fan motor coupled to one of the other fans except for the fan driven in the first fan motor driving process S20 may be operated at an operating speed altered from the operating speed by a preset value corresponding to the operating strength. That is, by operating the second fan motor at a second operating speed altered from the first operating speed by the preset value, the fan coupled to the second fan motor may be rotated.
  • the preset value may be determined in consideration of at least one of a load amount of the fan motor, a size of the fan, or a configuration of the air purifier.
  • the second fan motor may indicate the entirety of fan motors, except for the first fan motor, and the second fan motor may have the second operating speed altered from the first operating speed by the preset value.
  • the fan motor a may be the first fan motor and may be operated at the first operating speed of 100 rpm.
  • the fan motors b and c may be the second fan motors.
  • the fan motor b may be operated at the second operating speed of 150 rpm that is altered from the first operating speed by the preset value of 50 rpm, and the fan motor c may be operated at the second operating speed of 200 rpm altered from the first operating speed by a preset value of 100 rpm.
  • the fan motors are operated at different operating speeds. Therefore, noise caused by the operation of the fan motors may be reduced.
  • the second fan motor may be operated after a preset period of time has elapsed from the initiation of the operation of the first fan motor. That is, as illustrated in FIG. 5B, after the first fan motor driving process S20, it is determined whether the preset period of time has elapsed (S31). When it is determined that the preset period of time has elapsed, the second fan motor driving process S30 may be performed.
  • a counter electromotive force generated in inductors within the fan motors may be increased, as compared to a case in which a single fan motor is used.
  • a counter electromotive force generated during on or off switching operations of the fan motors is a very high voltage, as compared to a rated voltage for operating the air purifier. Therefore, if the plurality of fan motors are switched on or off at the same time, it is highly likely that the circuit malfunctions and part damages will occur.
  • the fan motor performs a hall sensor feedback control for 12 pulses per revolution.
  • an input voltage of the fan motor may be regulated to be within a range of 0 V to 6.5 V.
  • a motor power is switched on or off at the same time with power supply in an initial operation or if the operating speed of the fan motor is changed, a counter electromotive force, in which inductor components of the fan motors are large, may be generated.
  • defects of products caused by the above-described reasons may be difficult to repair or analyze. Therefore, it may be difficult to know the cause of defects.
  • the above-described problems may be solved by sequentially operating another fan motor after a preset period of time has elapsed from the initiation of an operation of one fan motor.
  • the preset period of time may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motor. That is, the preset period of time may mean a time at which an inductance generated by one fan motor does not affect the operations of other fan motors.
  • a time necessary for a normal operation of the fan motor may be reduced by first operating fan motors whose set operating speeds are higher.
  • the influence of the inductor appears strongly in the initial operation of the fan motor. Therefore, the influence of the inductor may be reduced if the operating speed of the fan motor is slowly increased after the operation of the fan motor. In this case, the air purifier may be operated, while minimizing interference between the plurality of fan motors.
  • a fan motor having a higher operating speed may be operated initially, and the other fan motor may be then operated after the preset period of time has elapsed.
  • the fan control method of the air purifier may include an operating mode determining process S40, an operating speed setting process S50, and a driving process S60.
  • the fan control method according to the exemplary embodiment of the present invention may be applied to an air purifier including a plurality of fans and a plurality of fan motors, which are coupled to the fans and drive the same.
  • an operating strength of the air purifier may be determined.
  • the operating strength may be set automatically or may be information input by a user.
  • a first operating speed corresponding to the operating strength, and a second operating speed, altered from the first operating speed by a preset value, may be calculated.
  • the calculated first and second operating speeds may be set as the operating speeds of the fan motors, respectively.
  • the first operating speed may be an operating speed set based on the operating strength
  • the second operating speed may be an operating speed altered from the first operating speed by a preset value.
  • the different second operating speed may be set to the respective fan motors.
  • the second operating speed may be different from the first operating speed by the preset value.
  • the preset value may be determined in consideration of at least one of a load amount of the fan motor, a size of the fan, or a configuration of the air purifier.
  • the first operating speed may be set to the fan motor a.
  • the second operating speed determined by adding a preset value of 50 rpm to the first operating speed may be set to the fan motor b.
  • the second operating speed determined by adding a preset value of 100 rpm to the first operating speed may be set to the fan motor c.
  • the second operating speed may be set in the respective fan motors using the same method as described above.
  • some of the fan motors may be driven at the first operating speed, and others may be driven at the second operating speed. That is, by operating the fan motors according to the set operating speeds, the fans coupled to the fan motors may be rotated. In other words, noise may be reduced by operating the fan motors at different operating speeds.
  • the fan motors may be sequentially operated in order to prevent circuit malfunctions and part damages, which may be caused when the plurality of fan motors are switched on or off at the same time.
  • a first fan motor operating process may be performed to operate the first fan motor rotating at the first operating speed.
  • a second fan motor operating process may be performed to operate the second fan motor rotating at the second operating speed.
  • the preset time interval may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motor. If the predetermined time interval elapses, an inductance generated by one fan motor may not affect the operations of other fan motors.
  • a time necessary for a normal operation of the fan motor may be reduced by first operating fan motors whose set operating speeds are higher. After comparing the first operating speed with the second operating speed, the fan motor operating at a high operating speed may be operated initially, and the other fan motors may be operated after the preset period of time has elapsed.
  • a counter electromotive force generated in the on or off switching operations of the fan motors may also be generated when the fan motors of the air purifier are initially driven or when the fan motors stop operating.
  • FIG. 7 is a flowchart illustrating a control flow when a fan operation is stopped, as an example of a fan control method of an air purifier according to an exemplary embodiment of the present invention.
  • a fan control method of an air purifier may include a stopping determining process S70, a first fan motor stopping process S80, and second fan motor stopping processes S90 and S91.
  • fan motors to be stopped among a plurality of fan motors may be determined. All or some of the fan motors may be stopped.
  • one of the fan motors to be stopped may be stopped.
  • the other fan motor may be stopped (S90) when a preset period of time has elapsed from the initiation of the first fan motor stopping process (S91).
  • the second fan motor stopping processes S90 and S91 are performed repetitively until all the fan motors to be stopped are stopped. Therefore, the air purifier may be operated with an operating strength desired by a user or an operating strength set automatically.
  • the fan motors may be sequentially stopped to minimize interference between the fan motors, which occurs due to the stopping of the fan motors.
  • the preset period of time may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motor. That is, the preset period of time may mean a time at which an inductance generated by one fan motor does not affect the operations of other fan motors.
  • a time necessary for stopping all the fan motors to be stopped may be reduced by first stopping the fan motors having higher operating speeds.
  • the influence of the inductor appears strongly in the initial stopping operation. Therefore, the influence of the inductor may be reduced after the stopping operation is started.
  • the air purifier may include a fan motor, a fan, and a controller.
  • the fan motor operates at an operating speed set according to a control signal.
  • the fan motor may be provided in numbers.
  • the fan is coupled to the fan motor and rotates to form air flow.
  • the fan may be provided in numbers. Due to the air flow formed by the fan and the fan motor, outside air may be introduced into the air purifier, and air filtered within the air purifier may be discharged to the outside of the air purifier.
  • the air purifier is a wall mount type air purifier. Noise generated when the plurality of fan motors and the plurality of fans are rotating may be resonated in a space between the air purifier and the wall, which may cause a louder noise.
  • the controller may control the operating speeds of the plurality of fan motors under conditions that do not cause the resonance, so as to prevent an increase of noise caused by the resonance.
  • the controller may receive the operating strength of the air purifier, which is input by the user, or the preset operating strength of the air purifier.
  • the controller may set the first operating speed corresponding to the operating strength.
  • the controller may set the second operating speed to be altered from the first operating speed by a preset value, that is, the operating speed at which no resonance occurs with the fan motor operating at the first operating speed.
  • the controller may transmit the control signal to the plurality of fan motors and operate the fan motors at the set first and second operating speeds.
  • the controller may sequentially start or stop operating the plurality of fan motors. Therefore, it may be possible to prevent circuit malfunctions and part damages during the on or off switching operations of the fan motors.
  • a counter electromotive force generated in inductors within the fan motors may be increased, as compared to a case in which a single fan motor is used.
  • a counter electromotive force generated during the on or off switching operations of the fan motors is a very high voltage, as compared to a rated voltage for operating the air purifier. Therefore, if the plurality of fan motors are switched on or off at the same time, it is highly likely that the circuit malfunctions and part damages will occur.
  • the controller may sequentially switched on or off the individual fan motors, instead of switching on or off the fan motors at the same time. That is, any one of the plurality of fan motors may be first operated, and another may be operated after a preset time interval has elapsed.
  • the counter electromotive force may be generated when the fan motors are stopped, as well as when the fan motors are operated. Therefore, the plurality of fan motors need to be sequentially stopped. That is, any one of the plurality of fan motors may be first stopped, and another may be stopped after a preset time interval has elapsed.
  • the preset time interval may be determined in consideration of at least one of an inductance characteristic, a driving voltage, and a load amount of the fan motor. If the preset time interval has elapsed, the inductance generated by one fan motor may not affect the operation and stop of other fan motors.
PCT/KR2011/009712 2010-12-16 2011-12-16 Air purifier and fan control method thereof WO2012081929A2 (en)

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JP2013544398A JP5725385B2 (ja) 2010-12-16 2011-12-16 空気清浄機及び空気清浄機のファン制御方法

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KR10-2010-0129488 2010-12-16
KR20100129488 2010-12-16
KR10-2010-0129487 2010-12-16
KR20100129487 2010-12-16

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CN104315662A (zh) * 2014-10-29 2015-01-28 小米科技有限责任公司 控制空气净化器工作的方法及装置
CN110513826A (zh) * 2019-09-10 2019-11-29 宁波奥克斯电气股份有限公司 一种空调器及其控制方法
US10907641B2 (en) 2018-03-20 2021-02-02 Lau Holdings, Llc Multi-fan assembly control

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