EP1571394B1 - Electronic regulating device and electric motor applied to a burner ventilator - Google Patents

Electronic regulating device and electric motor applied to a burner ventilator Download PDF

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Publication number
EP1571394B1
EP1571394B1 EP04425137.9A EP04425137A EP1571394B1 EP 1571394 B1 EP1571394 B1 EP 1571394B1 EP 04425137 A EP04425137 A EP 04425137A EP 1571394 B1 EP1571394 B1 EP 1571394B1
Authority
EP
European Patent Office
Prior art keywords
electric motor
speed
signal
input
stage
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.)
Expired - Lifetime
Application number
EP04425137.9A
Other languages
German (de)
French (fr)
Other versions
EP1571394A1 (en
Inventor
Attiliano Gambaretto
Giuseppe Toniato
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.)
Riello SpA
Original Assignee
Riello SpA
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 Riello SpA filed Critical Riello SpA
Priority to ES04425137.9T priority Critical patent/ES2611010T3/en
Priority to PL04425137T priority patent/PL1571394T3/en
Priority to EP04425137.9A priority patent/EP1571394B1/en
Priority to CN2005100531035A priority patent/CN1665122A/en
Publication of EP1571394A1 publication Critical patent/EP1571394A1/en
Application granted granted Critical
Publication of EP1571394B1 publication Critical patent/EP1571394B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed

Definitions

  • the flame control device is normally equipped with an electric control card for processing physical flame combustion parameters to regulate the fuel and combustion air mixture according to the desired calories.
  • the electronic control card therefore has one or more outputs for controlling the speed of the electric motor, so as to regulate combustion air supply by the ventilator on the basis of processing by the electronic control card.
  • Electric power supply input 7 is connected to a rectifying block 12 to convert a 230 volt alternating voltage phase to a 230 volt direct voltage required to electrically power electric motor 2 by means of switching device 5; and a DC/DC converter 13 is cascade-connected to rectifying block 12 to convert the 230 volt direct voltage to a 5 volt direct voltage required to electrically power programmable device 3 and speed sensor 4.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Description

  • The present invention relates to an electronic regulating device for an electric motor applied to a fuel burner ventilator.
  • As is known, a gas or vapourized liquid fuel burner is supplied with a mixture of fuel and combustion air; and the combustion air supply to the burner is regulated by a ventilator driven by an electric motor, the speed of which is controlled by a flame control device commonly used to control operation of the fuel burner.
  • The flame control device is normally equipped with an electric control card for processing physical flame combustion parameters to regulate the fuel and combustion air mixture according to the desired calories. The electronic control card therefore has one or more outputs for controlling the speed of the electric motor, so as to regulate combustion air supply by the ventilator on the basis of processing by the electronic control card.
  • Currently marketed fuel burners are substantially of two types used for two different types of application.
  • A first type comprises two-stage burners, commonly used in floor-mounted boilers, in which the flame control device directly controls electric power supply to the motor by a motor output (current phase).
  • A second type comprises modulating burners, commonly used in wall-mounted boilers, in which the flame control device modulates the speed of the ventilator by a PWM (Pulse Width Modulation) signal, i.e. by varying the duty cycle of a square-wave signal.
  • Currently marketed electric motors for fuel burner ventilators are simply equipped with an electronic switching device, and are designed for use with a specific type of burner.
  • More specifically, electric motors for two-stage burners simply have an input for receiving electric power supply directly from the motor output of the flame control device; and electric motors for modulating burners simply have a PWM input for connection to the corresponding PWM output of the flame control device.
  • As an example, the US patent application published with number US 2003/0030408 discloses a regulating device for an electric motor, particularly a AC induction motor, applied to a ventilator of a modulating burner. The regulating device has a command module for controlling the speed of the electric motor and a switching device for controlling speed variations of the electric motor as function of the signal from the command module.
  • In other words, being designed for a given type of flame control logic, the same type of electric motor cannot be used with different types of known or newly designed flame control devices.
  • It is an object of the present invention to provide an electronic regulating device for an electric motor applied to a fuel burner ventilator, designed to eliminate the aforementioned drawback, and which, in particular, is cheap and easy to produce.
  • According to the present invention, there is provided an assembly of an electronic regulating device and of an electric motor applied to a fuel burner ventilator, as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1.
  • According to the present invention, there is also provided a method of regulating an electric motor applied to a fuel burner ventilator, as claimed in Claim 6 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 6.
  • A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
    • Figure 1 shows a block diagram of the electronic regulating device for an electric motor applied to a fuel burner ventilator, according to the present invention;
    • Figure 2 shows a flow chart of the method of regulating an electric motor applied to a fuel burner ventilator, according to the present invention.
  • Number 1 in Figure 1 indicates as a whole an electronic regulating device for regulating the speed of an electric motor 2 applied to a ventilator (not shown) of a fuel burner (not shown). Regulating device 1 comprises a programmable device (microcontroller) 3; a speed sensor 4 for supplying a signal proportional to the speed of electric motor 2; a switching device 5 for regulating the voltage supplied to electric motor 2; and a selector 6 for selecting the operating mode of programmable device 3. In the Figure 1 embodiment, electric motor 2 is a brushless motor, speed sensor 4 is a Hall sensor, and switching device 5 is based on MOSFET transistors.
  • Regulating device 1 is controlled by a number of inputs, in particular an electric power supply input 7; a first-stage control input 8; a second-stage control input 9; a PWM (Pulse Width Modulation) input 10; and a three-point modulation input 11.
  • Electric power supply input 7 is connected to a rectifying block 12 to convert a 230 volt alternating voltage phase to a 230 volt direct voltage required to electrically power electric motor 2 by means of switching device 5; and a DC/DC converter 13 is cascade-connected to rectifying block 12 to convert the 230 volt direct voltage to a 5 volt direct voltage required to electrically power programmable device 3 and speed sensor 4.
  • First-stage control input 8, second-stage control input 9, PWM input 10, and three-point modulation input 11 supply respective signals directly to programmable device 3, which also receives a signal proportional to the speed of electric motor 2 from speed sensor 4, a feedback signal from switching device 5 and filtered by an integrating circuit 14, and three constant calibration signals from respective potentiometers (trimmers) 15, 16, 17.
  • Programmable device 3 processes the above signals to control switching device 5, which electrically powers electric motor 2, and to supply an output signal, proportional to the speed of electric motor 2, at an RPM output 18 of regulating device 1.
  • Electric power supply input 7, first-stage control input 8, second-stage control input 9, PWM input 10, three-point modulation input 11, and RPM output 18 are connected respectively to respective outputs and to a respective input of a generic external flame control device (not shown) for controlling overall operation of the fuel burner.
  • More specifically, first-stage control input 8 and second-stage control input 9 interpret two-state ("ON", "OFF") signals from a two-stage burner flame control device; three-point modulation input 11 interprets a three-state ("DOWN", "UP", "ZERO") signal from an external power regulator (not shown) controlled by the flame control device of a more sophisticated two-stage burner; and PWM input 10 interprets a PWM signal from a flame control device of a wall-mounted boiler burner.
  • RPM output 18 and PWM input 10 are preferably provided with respective optocouplers 20, 19 to protect programmable device 3 from voltage peaks and/or spurious input currents.
  • Programmable device 3 is programmed (firmware) to process the above signals and accordingly control switching device 5 to regulate the speed of electric motor 2 using a regulating method shown schematically in the Figure 2 flow chart.
  • The following is a detailed description of the regulating method.
  • In actual use, programmable device 3 continuously monitors the state of selector 6, which selects the operating mode of regulating device 1 and, therefore, the way in which programmable device 3 processes the signals from inputs 8, 9, 10, 11 of regulating device 1.
  • In a first (two-stage) operating mode, programmable device 3 :
    • first turns on electric motor 2 to set electric motor 2 to an intermediate speed determined by the constant signal from a first potentiometer 15;
    • enables first-stage control input 8 and second-stage control input 9;
    • sets electric motor 2 to a minimum speed, lower than the intermediate speed and determined by the constant signal from a second potentiometer 16, in the event the signal of first-stage control input 8 is "ON" and the signal of second-stage control input 9 is "OFF";
    • sets electric motor 2 to a maximum speed, higher than the intermediate speed and determined by the constant signal from a third potentiometer 17, in the event the signals of first- and second- stage control inputs 8, 9 are both "ON"; and
    • sets electric motor 2 to the intermediate speed, in the event the signals of first- and second- stage control inputs 8, 9 are both "OFF".
  • In a second (PWM) operating mode, programmable device 3 :
    • enables PWM input 10 and RPM output 18;
    • sets electric motor 2 to a speed determined by the duty cycle of the square-wave signal of PWM input 10; and
    • supplies RPM output 18 with a signal proportional to the speed of electric motor 2.
  • In a third (three-point modulation) operating mode, programmable device 3 :
    • first turns on electric motor 2 to set electric motor 2 to an intermediate speed determined by the constant signal from a first potentiometer 15;
    • enables first-stage control input 8 and second-stage control input 9;
    • sets electric motor 2 to the intermediate speed, in the event the signal of second-stage control input 9 is "OFF";
    • enables three-point modulation input 11, in the event the signal of second-stage control input 9 is "ON";
    • increases the speed of electric motor 2 according to a given up-ramp, in the event the signal of three-point modulation input 11 is "UP";
    • reduces the speed of electric motor 2 according to a given down-ramp, in the event the signal of three-point modulation input 11 is "drown"; and
    • leaves the speed of electric motor 2 unchanged, in the event the signal of three-point modulation input 11 is "ZERO".
  • The main advantage of the present invention is that of providing an electronic regulating device 1, for an electric motor 2 applied to a fuel burner ventilator, which can be integrated with the motor and interfaced with any known flame control device to obtain a more versatile motor assembly comprising electric motor 2 and regulating device 1.

Claims (9)

  1. An assembly comprising an electronic regulating device and an electric motor (2) which can be applied to a ventilator of a fuel burner; the regulating device (1) comprising control means (3, 4) for controlling the speed of said electric motor (2), and a switching device (5) for controlling variations in the speed of said electric motor (2) as a function of a signal from said control means (3, 4); the regulating device (1) being characterized in that it comprises a plurality of control inputs (7, 8, 9, 10, 11), which are controllable by a generic external flame control device of said burner, in that said control means (3, 4) comprise a programmable device (3) for processing the signals from said control inputs (7, 8, 9, 10, 11) to control said switching device (5) and in that the regulating device (1) further comprises selecting means (6) for selecting the operating mode of said control means (3, 4) and the way in which the programmable device (3) processes the signals from control inputs (7, 8, 9, 10, 11); said electric motor (2) being a brushless motor electrically powered with direct voltage.
  2. A regulating device as claimed in Claim 1, wherein the selecting means (6) comprise a selector (6) having at least three positions; the three positions corresponding respectively to a two-stage operating mode, a PWM (Pulse Width Modulation) operating mode, and a three-point modulation operating mode.
  3. A regulating device as claimed in Claim 2, wherein the plurality of control inputs (7, 8, 9, 10, 11) comprises an electric power supply input (7), a first-stage control input (8), a second-stage control input (9), a PWM input (10), and a three-point modulation input (11).
  4. A regulating device as claimed in one of Claims 1 to 3, wherein the control means (3, 4) comprise a speed sensor (4) for supplying a signal proportional to the speed of the electric motor (2); said programmable device (3) being programmed for processing the signals from the control inputs (7, 8, 9, 10, 11) and the signal from the speed sensor (4); said speed sensor being a Hall sensor (4).
  5. A regulating device as claimed in one of Claims 1 to 4, wherein the regulating device (1) is characterized by being integrated with the electric motor (2).
  6. A regulating method for regulating an electric motor (2) applied to a ventilator of a fuel burner; the regulating method being characterized by electrically powering said electric motor (2) with direct voltage, the electric motor (2) being a brushless motor, and by providing for at least three alternatively operating modes selectable with a selector (6); said operating modes corresponding respectively to a two-stage mode, a PWM (Pulse Width Modulation) mode, and a three-point modulation mode.
  7. A regulating method as claimed in Claim 6, wherein the two-stage operating mode depends on a signal of a first-stage control input (8) and a signal of a second-stage control input (9), which signals of the first- and second-stage control inputs (8, 9) may assume two states, namely a "ON" and a "OFF" state; the two-stage operating mode comprising the steps of:
    - first turning on the electric motor (2) to set the electric motor (2) to an intermediate speed, the intermediate speed being between a minimum speed and a maximum speed;
    - setting the electric motor (2) to the minimum speed, in the event the signal of the first-stage control input (8) is "ON" and the signal of the second-stage control input (9) is "OFF";
    - setting the electric motor (2) to the maximum speed, in the event the signals of the first- and second-stage control inputs (8, 9) are both "ON"; and
    - setting the electric motor (2) to the intermediate speed, in the event the signals of the first- and second-stage control inputs (8, 9) are both "OFF".
  8. A regulating method as claimed in Claim 6, wherein the PWM (Pulse Width Modulation) operating mode depends on a signal of a PWM input (10); the PWM operating mode comprising the steps of:
    - setting the electric motor (2) to a speed determined by the duty cycle of the square-wave signal of the PWM input (10); and
    - supplying an output (18) with a signal proportional to the speed of the electric motor (2).
  9. A regulating method as claimed in Claim 6, wherein the three-point modulation operating mode depends on a signal of a first-stage control input (8) and a signal of a second-stage control input (9), which signals of the first- and second-stage control inputs (8, 9) may assume two states, namely a "ON" and a "OFF" state, and on a signal of a three-point modulation input (11), which signal of the three-point modulation input (11) may assume three states, namely a "drown", a "UP" and a "ZERO" state; the three-point modulation operating mode comprising the steps of:
    - first turning on the electric motor (2) to set the electric motor (2) to an intermediate speed, the intermediate speed being between a minimum speed and a maximum speed;
    - setting the electric motor (2) to the intermediate speed, in the event the signal of the second-stage control input (9) is "OFF";
    - enabling the three-point modulation input (11), in the event the signal of the second-stage control input (9) is "ON";
    - increasing the speed of the electric motor (2) according to a given up-ramp, in the event the signal of the three-point modulation input (11) is "UP";
    - reducing the speed of the electric motor (2) according to a given down-ramp, in the event the signal of the three-point modulation input (11) is "DOWN"; and
    - leaving the speed of the electric motor (2) unchanged, in the event the signal of the three-point modulation input (11) is "ZERO".
EP04425137.9A 2004-03-02 2004-03-02 Electronic regulating device and electric motor applied to a burner ventilator Expired - Lifetime EP1571394B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES04425137.9T ES2611010T3 (en) 2004-03-02 2004-03-02 Electronic regulation device and electric motor applied to a burner fan
PL04425137T PL1571394T3 (en) 2004-03-02 2004-03-02 Electronic regulating device and electric motor applied to a burner ventilator
EP04425137.9A EP1571394B1 (en) 2004-03-02 2004-03-02 Electronic regulating device and electric motor applied to a burner ventilator
CN2005100531035A CN1665122A (en) 2004-03-02 2005-03-02 Electronic regulating device for an electric motor applied to a burner ventilator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425137.9A EP1571394B1 (en) 2004-03-02 2004-03-02 Electronic regulating device and electric motor applied to a burner ventilator

Publications (2)

Publication Number Publication Date
EP1571394A1 EP1571394A1 (en) 2005-09-07
EP1571394B1 true EP1571394B1 (en) 2016-12-07

Family

ID=34746223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425137.9A Expired - Lifetime EP1571394B1 (en) 2004-03-02 2004-03-02 Electronic regulating device and electric motor applied to a burner ventilator

Country Status (4)

Country Link
EP (1) EP1571394B1 (en)
CN (1) CN1665122A (en)
ES (1) ES2611010T3 (en)
PL (1) PL1571394T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7802984B2 (en) 2006-04-07 2010-09-28 Thomas & Betts International, Inc. System and method for combustion-air modulation of a gas-fired heating system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9310451U1 (en) * 1993-03-05 1994-06-30 Landis & Gyr Business Support Ag, Zug Control device for automatic gas firing systems for heating systems
US5732691A (en) * 1996-10-30 1998-03-31 Rheem Manufacturing Company Modulating furnace with two-speed draft inducer
US7111460B2 (en) * 2000-03-02 2006-09-26 New Power Concepts Llc Metering fuel pump
US6728600B1 (en) * 2000-06-08 2004-04-27 Honeywell International Inc. Distributed appliance control system having fault isolation
US6864659B2 (en) * 2001-07-12 2005-03-08 Varidigm Corporation Variable speed controller for air moving applications using an AC induction motor
US7270098B2 (en) * 2002-07-15 2007-09-18 Teleflex Canada Inc. Vehicle heater and controls therefor
US7101172B2 (en) * 2002-08-30 2006-09-05 Emerson Electric Co. Apparatus and methods for variable furnace control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
PL1571394T3 (en) 2017-06-30
ES2611010T3 (en) 2017-05-04
EP1571394A1 (en) 2005-09-07
CN1665122A (en) 2005-09-07

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