GB2457534A - Electric-motor driven fan speed control - Google Patents

Electric-motor driven fan speed control Download PDF

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Publication number
GB2457534A
GB2457534A GB0800729A GB0800729A GB2457534A GB 2457534 A GB2457534 A GB 2457534A GB 0800729 A GB0800729 A GB 0800729A GB 0800729 A GB0800729 A GB 0800729A GB 2457534 A GB2457534 A GB 2457534A
Authority
GB
United Kingdom
Prior art keywords
fan
rotational speed
control system
flow rate
volume flow
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0800729A
Other versions
GB0800729D0 (en
Inventor
Geoffrey Mark Lockwood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst UK Ltd
Original Assignee
Ebm Papst UK 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.)
Filing date
Publication date
Application filed by Ebm Papst UK Ltd filed Critical Ebm Papst UK Ltd
Priority to GB0800729A priority Critical patent/GB2457534A/en
Publication of GB0800729D0 publication Critical patent/GB0800729D0/en
Publication of GB2457534A publication Critical patent/GB2457534A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0261—Surge control by varying driving speed
    • F24F11/0076—
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • G05D7/0676—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on flow sources
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The air volume flow rate produced by an electric-motor driven fan is assessed and the rotational speed of the fan is controlled to give a substantially constant pre-set air volume flow rate. The rotational speed of the fan is monitored and in the event that the rotational speed rises to a predetermined value in order to achieve the pre-set volume flow rate, the rotational speed is thereafter controlled so as not to exceed that predetermined value notwithstanding further changes in the volume flow rate. The fan may comprise a forward-curved centrifugal blower and an electronically-commutated (EC) motor with integrated electronic circuitry. The control system may include a microprocessor having an input for connection to a building management system (BMS). In a ventilation system for a residential building, the invention keeps the noise of the fan to an acceptable level if the system resistance increases more than expected.

Description

FAN SPEED CONTROL
This invention relates to a method of controlling the speed of rotation of a fan incorporated in a system to move air within that system. The invention also relates to an air movement system including a control system for the speed of rotation of a fan.
In this specification, the term fan is used to mean the combination of an electric motor coupled either directly or indirectly to an impeller, to rotate that impeller and so drive air. Further, references are made herein to the speed of the electric motor and also of the impeller, by which is meant the rotational rate of the motor or the impeller, as required by the context.
A fan has a performance characteristic associated therewith, dependent upon the type of fan as well as its structure and that of a housing or duct within which the impeller is incorporated. The volume of air moved by a fan depends upon the resistance to the flow of that air: as the resistance increases, the volume flow rate reduces. This relationship is conveniently expressed by way of a fan performance characteristic curve. The resistance to flow depends upon the installation within which the fan is used and is referred to as the system resistance.
It is difficult accurately to predict the resistance to flow in a system.
There are expensive fluid dynamic calculation tools available to help assess this resistance but they are not readily available and need a significant amount of data input by skilled people, in order to achieve a reliable output. It is therefore the normal practice to estimate a system resistance on the basis of experience and empirical values.
It is the standard industry practice to select a fan that produces a greater flow than the estimated system resistance would indicate is required, in case the system resistance turns out to be higher than expected. A further allowance is also usually made if it is anticipated that the system resistance might increase with time. For example, if a filter is incorporated in the system, the system resistance will increase as the filter becomes clogged, so leading to a reduction in the volume flow rate for a given fan speed. The result is that a fan capable of producing more volume flow than is actually required is installed in the system, often leading to increased physical size and cost.
To overcome this problem, a control system may be incorporated for the fan, to adjust the fan speed to meet the required air volume flow. Such a control system may have a feedback loop so that the volume flow is maintained should the flow resistance increase or decrease; such a control system is referred to as a constant volume flow control.
Small fans incorporating an integral control system have been developed for residential applications so that the speed of the fan will be adjusted automatically to maintain a constant volume flow. An example of such a fan is a forward curved single inlet centrifugal fan with an electronically commutated (EC) motor, where an microprocessor internal to the motor casing monitors the motor speed and current input and determines the operating point by use of look-up tables and formulae. Selection of the required volume flow is achieved by applying a DC reference signal to the control system. For example, referring to Figure 1 (described hereinafter) fan curve 1 may be achieved by applying a 1 OV DC signal and fan curve 2 by applying a 6V DC signal.
Constant volume control systems can significantly improve the installation and efficiency of a fan system. The fan produces only the required volume flow and there are significant energy savings that otherwise would be consumed by the over-supply of ventilation. There is however a problem associated with such a constant volume system, especially when used with a forward curved centrifugal blower, in that the fan can become a noise nuisance if the restriction to volume flow becomes excessive.
Taking the particular case of a forward curved centrifugal fan, as the resistance to flow increases the fan speed also increases to overcome the increase in resistance and maintain the required volume flow. Referring again to Figure 1, the noise at point C on fan curve 1 is much greater than that at point A. Suppliers of ventilation systems for residential buildings suffer from unnecessary maintenance calls because the occupier has complained a tan is too noisy. The cause often is unrelated to the fan itself but more typically is because the flow resistance has been increased for example by a restriction or blockage in ducting associated with the ventilation system, or a restriction of a ventilation air outlet. It is therefore a principal aim of this invention to control the speed of a constant volume flow control fan in such a way that should the system resistance increase more than expected, the noise of the fan is still kept at an acceptable level.
According to one aspect of this invention, there is provided a method of controlling the operation of an electric-motor driven fan provided with a fan rotational speed control system, in which method the fan is operated to produce air flow, the air volume flow rate is assessed and the rotational speed of the fan is controlled to give a substantially constant preset air volume flow rate, the rotational speed of the fan is monitored, and in the event the rotational speed of the fan rises to a predetermined value the tan rotational speed control system is adjusted to limit the speed of the tan to not more than said predetermined value.
In a particularly preferred form of the invention, in the event the rotational speed of the fan rises to said predetermined value, the fan rotational speed control system is adjusted to lower the preset constant volume air flow rate, thereby to reduce the duty on the fan and maintain the rotational speed at not more than the predetermined value.
According to a second and closely related aspect of this invention an air movement system comprises an electric-motor driven fan, assessing means to assess the air volume flow rate when the fan is operating, monitoring means to monitor the rotational speed of the fan, and a fan rotational speed control system connected to the assessing means and arranged to control the rotational speed of the fan to give a substantially constant preset volume flow rate, the control system also being connected to the monitoring means and arranged so that in the event the rotational speed of the fan rises to a predetermined value the control system is adjusted limit the speed of the fan to not more than said predetermined value.
As explained above, with a constant volume control system, the rotational speed of the fan is increased to maintain a required volume flow in the event that the system resistance is increased. It will be appreciated that with this invention, the control system limits the maximum speed of the fan in order to maintain the noise generated by the fan to an acceptable level, even though the control system indicates that a fan speed increased above the pre-determined value is required to achieve the pre-set air volume flow.
In performing this invention, it is preferred that the control system is pre-loaded with data concerning the fan characteristics, determined either empirically or by calculation, or a combination of these. The control system may act on the integral constant volume characteristic of the fan by providing a control signal to the fan to set the desired volume flow characteristic. The control system also monitors the motor speed and then compares the monitored values with pre-stored data to allow an assessment of the fan performance. In this way, the fan may be arranged to operate on a first characteristic curve during initial setup, but in the event that the system resistance increases unexpectedly, the control system may move the operation to a second characteristic curve so as to ensure the fan speed does not rise above the pre-determined value.
Preferably, the control system includes an alarm arrangement such that in the event that the control system has to restrict the rotational speed of the fan to a value below that which the pre-set volume flow rate demands, an indication of this is given such that appropriate action may be taken. For example, if the air movement system includes an air filter, this alarm could indicate that the filter requires servicing.
By way of example only, one specific embodiment of a fan provided with a fan rotational speed control system and arranged in accordance with this invention will now be described in detail, reference being made to the accompanying drawings in which:-Figure 1 illustrates fan characteristic curves for a typical ventilation fan operating by a method of this invention; and Figure 2 illustrates the control system for the ventilation fan.
Figure 1 has already been discussed hereinbefore, with reference to the operation of a forward-curved single inlet centrifugal fan or blower so as to achieve a substantially constant air volume flow rate, suitable for use in, for example, a domestic ventilation system. Typically, a decision would be made by the installer of the system as to what air volume flow is required for the ventilation system. In the example of Figure 1, an air volume flow rate of 300m31h has been selected such that the fan operates on fan characteristic curve 1. This is achieved by the integrated fan microcontroller reading the desired volume flow from the output of the control system, determining fan's power input and rotational speed from internal sensors, and through embedded look up tables and formulae the microcontroller adjusts the fan to a point A in Figure 1.
As the system resistance increases, the fan duty point moves from A to B on fan curve 1. If the system resistance were to continue to rise the fan speed would be increased to maintain the required air flow until duty point C is reached. However, this would give rise to unacceptable fan noise and so the control system serves to reduce the control input to the fan motor for example to fan curve 3 leading to operation at a duty point D. The volume flow has been reduced but the fan noise has been limited.
This performance is based on the control system understanding the fan performance characteristics, monitoring the fan speed, defining a maximum system resistance for a number of conditions, and using algorithms to limit the fan performance and so also the noise.
When operating on fan curve 1, once duty point B has been reached the control unit may output an alarm signal to indicate the system resistance has risen to such an extent that maintenance or other checks should be undertaken to restore the system resistance to its initial value.
Figure 2 illustrates a typical control system for an EC motor driven fan arranged in accordance with this invention. In this figure, there is shown an EC motor M which is directly connected to the impeller of a fan (not shown). Mains at 50 or 60hz is supplied on wires to the L and N terminals of a DC converter 10 incorporated within the motor control electronic circuitry 11. The converter provides DC to the permanent magnet motor M provided with an electronically-commutated rotating field under the control of a microprocessor 12. A control signal 13 is supplied to the microprocessor which then controls the electronic commutation of the motor in order to achieve a fan characteristic corresponding to the supplied control signal 13. A speed sensor 14 is associated with the motor M and provides a signal 15 indicative of the rotational speed of the motor. Typically, the speed sensor 14 comprises a Hall-effect switch which is triggered by the rotating permanent magnet rotor of the motor. The control circuitry also includes a DC power supply 16 which feeds power to a control unit 17 including a microprocessor 18.
There is an input 21 to the microprocessor 17 for selection of the constant volume characteristics of the fan, using control 22. In the example discussed above, this control is set to give a air volume flow rate of 300 m3/h, at which the system pressure should be 100 Pa. A further control 23 is connected to microprocessor input 24 to allow remote setting of the duty of the fan. In addition, a network input 25 is provided for the microprocessor, whereby the control unit may be connected to a building management system (BMS) 26 for complete integration of the ventilation system with a building within which that system is installed.
The microprocessor receives the speed signal 15 at input 26. The microprocessor runs a suitable program in association with data pre-loaded into the microprocessor memory and concerning the fan performance characteristic, system configuration and so on, in order to determine the operating point on the selected fan curve. Consequent upon that, the microprocessor outputs the control signal 13, at port 27.
The program detects the fan speed signal 15 derived from sensor 14. In the event that the fan speed rises above a pre-determined value, the program then shifts the operating point to another fan curve, in order to maintain the operating speed at a level which produces an acceptable noise. As mentioned above, in this example the operation may be shifted to fan curve 3, so moving the duty point from B to D (Figure 1). This reduces the air volume flow rate but keeps the rotational speed of the fan at a level which gives rise to an
acceptable noise.

Claims (18)

  1. CLAIMS1. A method of controlling the operation of an electric-motor driven fan provided with a fan rotational speed control system, in which method the tan is operated to produce air flow, the air volume flow rate is assessed and the rotational speed of the tan is controlled to give a substantially constant preset air volume flow rate, the rotational speed of the f an is monitored, and in the event the rotational speed of the fan rises to a predetermined value the f an rotational speed control system is adjusted to limit the speed of the fan to not more than said predetermined value.
  2. 2. A method as claimed in claim 1, wherein in the event the rotational speed of the fan rises to said predetermined value, the fan rotational speed control system is adjusted to lower the preset constant volume air flow rate, thereby to reduce the duty on the fan and maintain the rotational speed at not more than said predetermined value.
  3. 3. A method as claimed in claim 2, wherein the fan rotational speed control system is arranged to permit the setting of a required air volume flow rate.
  4. 4. A method as claimed in claim 3, wherein the air volume flow rate is assessed from the monitored speed of the fan in conjunction with known constant volume characteristics for the fan.
  5. 5. A method as claimed in claim 4, wherein the control system has sets of pre-stored data relating to the fan performance characteristics.
  6. 6. A method as claimed in claim 5, wherein the control system is arranged to move the required air volume flow rate to another pre-stored set of data relating to the tan performance characteristics, in the event that the initial preset air volume flow rate would require the rotational speed of the fan to exceed the predetermined value thereof. -10-
  7. 7. A method as claimed in any of the preceding claims, wherein the fan rotational speed control system indicates an alarm condition in the event that the fan rotational speed control system is adjusted to lower the preset constant volume air flow rate, thereby to reduce the duty on the fan.
  8. 8. A method of controlling the operation of an electric-motor driven fan as claimed in claim 1 and substantially as hereinbef ore described with reference to the accompanying drawings.
  9. 9. An air movement system comprising an electric-motor driven fan, assessing means to assess the air volume flow rate when the fan is operating, monitoring means to monitor the rotational speed of the fan, and a fan rotational speed control system connected to the assessing means and arranged to control the rotational speed of the fan to give a substantially constant preset volume flow rate, the control system also being connected to the monitoring means and arranged so that in the event the rotational speed of the fan rises to a predetermined value the control system is adjusted to limit the speed of the fan to not more than said predetermined value.
  10. 10. An air movement system as claimed in claim 9, wherein the fan rotational speed control system is arranged to adjust the preset constant volume air flow to a lower rate in the event the rotational speed of the fan rises to said predetermined value, thereby to reduce the duty on the fan and maintain the rotational speed at not more than said predetermined value.
  11. 11. An air movement system as claimed in claim 9, wherein the electric motor driving the fan comprises an electronically-commutated (EC) motor with integrated electronic circuitry.
  12. 12. An air movement system as claimed in any of claims 9 to 11, wherein the control system includes a microprocessor having an input to monitor fan speed, the microprocessor being pre-programmed with data for the fan performance characteristics whereby the fan speed indicates the actual fan duty point.
  13. 13. An air movement system as claimed in claim 12, wherein the microprocessor includes an input for the maximum permissible speed whereby that speed can be preset.
  14. 14. An air movement system as claimed in any of claims 9 to 13, wherein the fan rotational speed control system includes an alarm arrangement which indicates an alarm condition in the event that the rotational speed of the fan is restricted to a value below that required to maintain a constant air volume flow.
  15. 15. An air movement system as claimed in any of claims 9 to 14, wherein the microprocessor includes an input for connection to a building management system (BMS) of a building within which the air movement system is installed.
  16. 16. An air movement system as claimed in any of claims 9 to 15, wherein the electric motor comprises an EC motor including a DC supply output which is arranged to power the control system.
  17. 17. An air movement system as claimed in any of claims 9 to 16, wherein the fan comprises a forward-curved centrifugal blower.
  18. 18. An air movement system as claimed in claim 9 and substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB0800729A 2008-01-16 2008-01-16 Electric-motor driven fan speed control Withdrawn GB2457534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0800729A GB2457534A (en) 2008-01-16 2008-01-16 Electric-motor driven fan speed control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0800729A GB2457534A (en) 2008-01-16 2008-01-16 Electric-motor driven fan speed control

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GB0800729D0 GB0800729D0 (en) 2008-02-20
GB2457534A true GB2457534A (en) 2009-08-26

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2357365A2 (en) 2010-02-01 2011-08-17 Brink Climate Systems B.V. Air movement system
ITTO20120340A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOUSE INCLUDING FILTER VEHICLES AND A CONTROL UNIT THAT IS ABLE TO RECOGNIZE A CLOSED CONDITION OF THESE FILTER MEANS
ITTO20120339A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOOD AND METHOD FOR THE CONTROL OF THE TREATMENT OF AN AIR FLOW THAT FLOWS THROUGH THAT HOOD
ITTO20120344A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOOD INCLUDING MEASURING ACOUSTICS AND METHOD FOR NOISE REDUCTION ISSUED BY ITS HOOD
RU2584517C2 (en) * 2010-08-31 2016-05-20 БРОАН-НЬЮТОУН ЭлЭлСи Device, system and method of vent system calibration
CN106091276A (en) * 2016-06-21 2016-11-09 珠海格力电器股份有限公司 Constant air volume control method and device for motor fan system, unit and haze removal machine
WO2017054814A1 (en) * 2015-10-02 2017-04-06 Ziehl-Abegg Se Motor for fans or blowers, pumps or compressors, method for operating such a motor and blower system having one or more motor(s)/blower(s)
JP2017110853A (en) * 2015-12-16 2017-06-22 株式会社鷺宮製作所 Controller for EC fan motor control
EA028345B1 (en) * 2012-04-17 2017-11-30 Индезит Компани С.П.А. Hood and method of operation thereof
EP4354024A1 (en) * 2022-10-11 2024-04-17 BORA - Vertriebs GmbH & Co KG Method for controlling a device for drawing cooking fumes, in particular for controlling a cooking hob extractor, control device, device and cooking hob system

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US4707646A (en) * 1986-05-29 1987-11-17 Carrier Corporation Method of limiting motor power output
US4921509A (en) * 1987-10-30 1990-05-01 Micro-Technology Licensing Corporation Air filtration system for ducted range hoods
US6066194A (en) * 1998-04-17 2000-05-23 American Standard Inc. Electronic room air cleaner with variable speed motor

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Publication number Priority date Publication date Assignee Title
US4707646A (en) * 1986-05-29 1987-11-17 Carrier Corporation Method of limiting motor power output
US4921509A (en) * 1987-10-30 1990-05-01 Micro-Technology Licensing Corporation Air filtration system for ducted range hoods
US6066194A (en) * 1998-04-17 2000-05-23 American Standard Inc. Electronic room air cleaner with variable speed motor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2357365A2 (en) 2010-02-01 2011-08-17 Brink Climate Systems B.V. Air movement system
US9638432B2 (en) 2010-08-31 2017-05-02 Broan-Nutone Llc Ventilation unit calibration apparatus, system and method
RU2584517C2 (en) * 2010-08-31 2016-05-20 БРОАН-НЬЮТОУН ЭлЭлСи Device, system and method of vent system calibration
ITTO20120340A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOUSE INCLUDING FILTER VEHICLES AND A CONTROL UNIT THAT IS ABLE TO RECOGNIZE A CLOSED CONDITION OF THESE FILTER MEANS
ITTO20120339A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOOD AND METHOD FOR THE CONTROL OF THE TREATMENT OF AN AIR FLOW THAT FLOWS THROUGH THAT HOOD
ITTO20120344A1 (en) * 2012-04-17 2013-10-18 Indesit Co Spa HOOD INCLUDING MEASURING ACOUSTICS AND METHOD FOR NOISE REDUCTION ISSUED BY ITS HOOD
EA028345B1 (en) * 2012-04-17 2017-11-30 Индезит Компани С.П.А. Hood and method of operation thereof
RU2718996C1 (en) * 2015-10-02 2020-04-15 Циль-Абегг СЕ Engine for blowers, respectively fans, pumps or compressors, operating method of such engine and fan system having one or more motors/fans
WO2017054814A1 (en) * 2015-10-02 2017-04-06 Ziehl-Abegg Se Motor for fans or blowers, pumps or compressors, method for operating such a motor and blower system having one or more motor(s)/blower(s)
CN108139102A (en) * 2015-10-02 2018-06-08 施乐百有限公司 For fan or ventilation blower, the motor of pump or compressor, for operating the method for the motor and there is the VENTILATING SYSTEM BY VOLTAGE STEP of one or more motor/ventilation blowers
CN108139102B (en) * 2015-10-02 2020-08-07 施乐百有限公司 Motor, method of operating the same, and fan system having the same
US11754083B2 (en) 2015-10-02 2023-09-12 Ziehl-Abegg Se Motor for fans or blowers, pumps or compressors, method for operating such a motor and blower system having one or more motor(s)/blower(s)
JP2017110853A (en) * 2015-12-16 2017-06-22 株式会社鷺宮製作所 Controller for EC fan motor control
CN106091276B (en) * 2016-06-21 2019-01-04 珠海格力电器股份有限公司 Constant air volume control method and device for motor fan system, unit and haze removal machine
CN106091276A (en) * 2016-06-21 2016-11-09 珠海格力电器股份有限公司 Constant air volume control method and device for motor fan system, unit and haze removal machine
EP4354024A1 (en) * 2022-10-11 2024-04-17 BORA - Vertriebs GmbH & Co KG Method for controlling a device for drawing cooking fumes, in particular for controlling a cooking hob extractor, control device, device and cooking hob system

Also Published As

Publication number Publication date
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