EP2175553A1 - Système de réglage - Google Patents

Système de réglage Download PDF

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Publication number
EP2175553A1
EP2175553A1 EP08017851A EP08017851A EP2175553A1 EP 2175553 A1 EP2175553 A1 EP 2175553A1 EP 08017851 A EP08017851 A EP 08017851A EP 08017851 A EP08017851 A EP 08017851A EP 2175553 A1 EP2175553 A1 EP 2175553A1
Authority
EP
European Patent Office
Prior art keywords
power electronics
control system
sensor
voltage
control unit
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Withdrawn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
EP08017851A
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German (de)
English (en)
Inventor
Gerhard Leutwein
Alexander Heide
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.)
Ziehl Abegg SE
Original Assignee
Ziehl Abegg SE
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 Ziehl Abegg SE filed Critical Ziehl Abegg SE
Priority to EP08017851A priority Critical patent/EP2175553A1/fr
Publication of EP2175553A1 publication Critical patent/EP2175553A1/fr
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans

Definitions

  • the invention relates to a control system, and more particularly to a control system having a sensor control unit.
  • Control systems are used in many areas. For example, control systems are used as part of a fan system in which the fan is incorporated as part of a condenser for liquefying a refrigerant in a refrigeration cycle.
  • such conventional control systems include regulator power electronics which, for example, when used as part of a fan system, cooperate with a fan.
  • the regulator power electronics usually receives measured data from at least one sensor, which - to continue the above example - detects the pressure of the air flow generated by the fan.
  • the sensor detects measured values of other suitable measured variables that are influenced by the fan.
  • the controller power electronics is connected to a supply voltage source, which provides a supply voltage for driving the fan. To minimize deviations from a predetermined setpoint, the controller power electronics modified based on a comparison of the measured data with the setpoint, the supply voltage and supplies this modified supply voltage to the fan.
  • FIG. 1 An exemplary conventional control system 1 is shown in FIG. 1 and comprises two fans 2 arranged in a refrigeration system (not shown) as part of a condenser (not shown). Each fan 2 comprises a rotor and an electric motor arranged on the rotor hub for driving the rotor.
  • controller power electronics 3 Remote from the fans 2 is a controller power electronics 3.
  • the controller power electronics 3 are integrated (not shown) pressure sensors for detecting the refrigerant pressure in the condenser. Alternatively, in other systems, the air pressure or air flow generated by the fan may be detected. Via an input button 4, a user can specify desired values which the measured value should assume at the measuring location. Accordingly, the controller power electronics 3 is arranged at a location which is accessible on the one hand for a user and on the other hand allows a suitable contact of the pressure sensor with the affected by the fans 2 refrigerant pressure, air pressure or air flow.
  • the controller power electronics 3 Based on a comparison of the setpoint values entered by the user with the detected pressure values, the controller power electronics 3 intervene in the fan mode in order to minimize deviations from the setpoint values.
  • the controller power electronics 3 is connected via a line 5 to a conventional low-voltage network, which provides an AC voltage of, for example, 230 V.
  • the controller power electronics 3 uses, for example, a phase control or section control in order to modify the supply voltage. Via line 6, it then provides the fans 2 or the motors for driving the rotors with the modified supply voltage, which provides the desired fan operation causes and ideally compensates for the current deviation.
  • the controller power electronics for example, require a power unit in order to be able to adapt the supply voltage in accordance with the current requirements and to pass it on to the fans 2.
  • a phase control for example, triacs or similar components are required.
  • This principle of speed variation or voltage modification by means of phase control is also responsible for an increased energy loss, also usually occur electromagnetic excitations in the motors, which cause unwanted noise.
  • the object of the invention is to provide a control system which overcomes the above disadvantages.
  • a control system comprises a power electronics component and an external sensor control unit connected to the power electronics component. Furthermore claimed is a power electronics component together with a sensor control unit, which are intended for the construction of a control system according to the invention.
  • the power electronics component of the controller system according to the invention is used to control an electric motor.
  • an electric motor is normally connected to a motor drive output of the power electronics component, to which the power electronics component provides a modified supply voltage corresponding to the current requirements.
  • the power electronics component is integrated with the electric motor that it serves to drive and that is connected to its motor drive output in one unit; in other embodiments it is an external unit separate from this electric motor.
  • the power electronics component receives a supply voltage via a supply voltage input, which is normally in the low-voltage range, for example an AC voltage of 230 V.
  • a supply voltage input which is normally in the low-voltage range, for example an AC voltage of 230 V.
  • the power electronics component can be connected to a standard power outlet.
  • any other voltage source can take over the power supply, as long as the supplied supply voltage sufficient to drive the electric motor and is suitable to its control, the power electronics component is to serve.
  • the power supply also includes providing a reference potential to a ground input of the power electronics component.
  • the power electronics component has a manipulated variable input for receiving a manipulated variable.
  • the manipulated variable specifies - directly or indirectly - which fraction of the supply voltage is to be supplied to an electric motor connected to the power electronics component.
  • the manipulated variable is the direct output variable of a regulator and must first be converted into a suitable signal, which can be used for a corresponding modification of the supply voltage.
  • the manipulated variable is also a signal that can be used to modify the supply voltage without further conversion.
  • a modification of the supply voltage by an electronic commutation unit is possible, which controls an electronically commutated (EC) motor.
  • EC electronically commutated
  • Other embodiments use a phase or section control, or an adaptive division of the supply voltage by means of a voltage divider.
  • the modified according to the manipulated variable supply voltage provides the power electronics component at their above-mentioned motor drive output.
  • a belonging to a fan electric motor is connected.
  • the electric motor drives the rotor of the fan in response to the voltage applied to the motor drive output voltage at a certain speed.
  • the power electronics component includes a voltage output. At this point, it provides a voltage which it preferably branches off from the supply voltage available to it, for example by means of a voltage divider. Basically, the voltage provided at the voltage output is a low voltage at low current, for example, a voltage of 10 V at a maximum of 10 mA. If the power electronics component includes a ground input, it usually also has a ground output connected to the ground input.
  • the power electronics component is designed in such a way that it can handle a supply voltage applied to its supply voltage input and modify it based on a manipulated variable provided at its manipulated variable input, which if necessary converts it as required, before applying the modified supply voltage to its motor driver. Output provides.
  • the power electronics component is designed so that it can provide a defined voltage at its voltage output, which preferably branches off from the supply voltage.
  • the power electronics component is connected to an external sensor control unit as described below.
  • the sensor control unit is referred to as "external” because it is spatially separated and located away from the power electronics component.
  • An external sensor control unit as defined in the description and claims is normally housed in a separate housing.
  • the external sensor controller unit is not connected to the "normal" power supply or any other common power source. Rather, it receives the power necessary for its function from the power electronics component, to which its voltage input is connected to the voltage output of the power electronics component.
  • the sensor control unit receives from the power electronics component a DC voltage of about 10 V and a maximum current of 10 mA. A higher supply power usually does not need the sensor control unit, since they do not have any mechanical elements or the like. must operate, but only processed and forwarded signals. Possibly.
  • the sensor controller unit has a ground input which is connected to the mass output of the power electronics component.
  • the external sensor control unit comprises a sensor, which it also supplies with energy when needed.
  • the type of sensor used depends on the application and environment in which the control system according to the invention is used: If, for example, a fan is connected to the motor drive output of the power electronics component, then the sensors used are usually a pressure sensor which via the air pressure at the measuring location, the amount of air or fluid conveyed by the fan is detected. However, it is also conceivable to use other sensor types, for example temperature or flow sensors. Generally speaking, the sensors used are preferably suitable for detecting a measurable variable which is influenced by a unit which is connected to the motor drive output of the power electronics component and driven by the modified supply voltage provided at this output. For example, even if the control system includes two fans, normally only one measurand is detected, for which a single sensor is used.
  • a manipulated variable is calculated with which both fans are controlled.
  • the sensor control unit comprises two or more sensors, each of which detects different measured variables. The different measured variables are then included in a calculation of the manipulated variable. Also in this case, the same manipulated variable is used to control both fans.
  • the sensor controller unit should be located in a location suitable for detecting the relevant measurand (s).
  • a sensor control unit comprising temperature sensors should be at least partially in or in contact with an element whose temperature is to be measured; and a sensor regulator unit comprising pressure sensors should be at least partially in contact with the medium whose pressure is to be affected, etc.
  • the sensor control unit includes a user interface, such as in the form of one or more pushbuttons or knobs or one or more buttons. It is also possible to provide a user interface via which a programming tool can be connected to specify a setpoint.
  • the user's inputs store the sensor controller unit in an internal memory unit.
  • the setpoints can be changed at any time by the user.
  • the user may also enter other data via the user interface.
  • the user can specify a control range in which a (possibly adapted) measured value may move so that a control functionality is used to calculate the manipulated variable. If a measured value is no longer in this range - for For example, because it deviates too much from a nominal value, the manipulated variable is set to a maximum value or a minimum value independently of a control functionality, for example.
  • the sensor control unit does not have a user interface, it still stores in accordance with most embodiments of the invention, for example, a factory-set, non-variable setpoint value in an internal memory unit.
  • the external sensor control unit further has a display facility to the user, for example, to be able to display the current actual value of the measured variable, the input setpoint or a deviation from the setpoint.
  • a display facility to the user, for example, to be able to display the current actual value of the measured variable, the input setpoint or a deviation from the setpoint.
  • analogue and digital display fields or devices come into consideration, which are usually integrated into the sensor control unit.
  • a setpoint defines a range or value that a measurement acquired by the sensor should take. It is also possible to specify a setpoint curve for any period. Setpoints should be chosen such that they are comparable to the measured value of the sensor. Under certain circumstances, a conversion of setpoint and / or measured value (s) may be required.
  • the sensor controller unit In order for them to process, possibly convert and evaluate the measured value and the setpoint values detected by the sensor, the sensor controller unit normally has appropriate electronics and / or software.
  • the sensor control unit is preferably designed to compare the measured value with the currently valid setpoint value.
  • a controller integrated into the sensor controller unit calculates a suitable manipulated variable.
  • Most suitable are mostly P or PID controllers; however, this depends on the overall system.
  • the controller is either hardware or software implemented.
  • a user may enter, via the user interface described above, a control functionality stored in a memory of the sensor control unit; or the user can make a selection between several predetermined control functions.
  • the control functionality is preset at the factory and can not be changed.
  • a manipulated variable is selected which does not change the system. If there is a significant deviation, the sensor control unit adjusts the manipulated variable so that it can cause a corresponding change in the system, for example by increasing the speed of a fan connected to the motor drive output of the power electronics component.
  • the manipulated variable thus calculated provides the sensor controller unit as the output value at its manipulated variable output.
  • the manipulated variable output is connected to the manipulated variable input of the power electronics component.
  • the power electronics component uses the control variable provided for a corresponding modification of the supply voltage.
  • a control system usually comprises an electric motor which is connected to the motor drive output of the power electronics component.
  • this electric motor is part of a fan, which can influence by its operation a measured variable, the then again detected by the sensor of the sensor control unit.
  • a control system comprises a plurality of power electronics components, to whose motor drive connection in each case an electric motor can be connected. Then, the sensor controller unit provides an actuating signal which is used for all power electronics components.
  • the sensor control unit In a control system according to the invention, normally only the power electronics component, but not the sensor control unit, requires a power unit, since the sensor control unit only has to ensure low voltages for processing the measured values and for operating the sensor.
  • the components which were required, for example, for a phase control performed in the sensor control unit preferably fall away.
  • the sensor control unit can be advantageously used in conjunction with motors having an electronic commutation as a power part.
  • the engine is often housed together with the power electronics component in a housing. This saves on the one hand costs, on the other hand energy because the fan system with the electronic commutation unit causes less losses.
  • the invention enables a practical guidance of the supply voltage lines, which need not be guided via the external sensor control unit. This not only saves on cable material, but also eliminates a potential hazard by laying supply lines in exposed areas.
  • FIG. 2 illustrates a control system 10 according to the invention with two fans 20, both of which contain an integrated power electronics component.
  • the power electronics components of the fans 20 are not directly visible because they are integrated into the motors.
  • Both fans 20 are shown as fans with integrated external rotor motor. These include a rotor 21 with directly applied wings.
  • the electric motor is connected to the motor drive output of the respective integrated power electronics component, which provides the supply voltage for the external rotor motor of the fan.
  • both power electronic components are connected to a (not shown) supply voltage source, which provides an AC voltage of 230 V in the present case.
  • a line 60 connects an external sensor control unit 30 separate from the power electronics component and the fans 20 and with the fans 20. Via this line 60, the sensor control unit 30 receives the energy which it needs to process the measured values. the calculation and provision of the manipulated variable, etc. required. Mechanical components or similar does not need to drive the sensor controller unit. Therefore, the line 60 transmits only low voltages and low currents.
  • both fans 20 are jointly responsible for an adequate power supply of the sensor control unit 30.
  • one of the fans 20 provides the required voltage so that the connection between the sensor controller unit 30 and the other of the fans 20 is used only for the transmission of signals from the sensor controller unit 30 to this fan.
  • the sensor controller unit 30 shown has an integrated sensor which supplies its measured values.
  • the sensor detects the pressure of the refrigerant in a condenser, or the air pressure at the location of the sensor control unit, which is influenced by both fans 20 in the embodiment shown. In other embodiments, the measurand is only affected by one of the fans.
  • the sensor controller unit calculates a manipulated variable. This manipulated variable is output via line 60 to both fans 20.
  • the different routing of the system 10 according to the invention is clearly visible.
  • the supply line 50 leads only to the fans 20, but not to the sensor control unit 30.
  • line 60 which connects the power electronics component integrated in the fans 20 with the sensor control unit 30, only weak voltages and currents are performed, so that the wiring is not safety-critical and can be laid with less effort than the supply line 50.
  • FIG. 3 schematically illustrates another embodiment of a control system 100 according to the invention FIG. 2 Corresponding components correspond to the reference numerals used there.
  • the illustrated control system 100 is a fan system that includes a fan 20 having an electronically commutated motor or an asynchronous motor 150 for driving a rotor or impeller 21, respectively.
  • a fan 20 having an electronically commutated motor or an asynchronous motor 150 for driving a rotor or impeller 21, respectively.
  • the fan 20 influences an in FIG. 3 indicated by arrows airflow.
  • a sensor control unit 30 with integrated measuring cell 110 is arranged such that the measuring cell 110 can detect a pressure p exerted by the air flow on the measuring cell 110.
  • the measuring cell 110 determines a measured value per second and forwards the determined measured values either individually directly after the detection or collected after a predetermined time to an evaluation electronics 120 of the sensor control unit 30.
  • the evaluation electronics 120 is connected upstream of the actual control electronics 130.
  • the evaluation electronics 120 can draw conclusions about the influence of the air flow through the fan 20. Their task is to process the measured values in such a way that they are suitable for further use in the If necessary, the evaluation unit 120 converts the measured values, for example, into other sizes or formats, for example, to enable a comparison of the measured values with a setpoint input by the user. In some embodiments, evaluation electronics 120 also determines averages over a predetermined number of measurements and subsequently uses only those averages. The adapted measured values are transmitted by the evaluation electronics 120 to the control electronics 130.
  • the control electronics 130 includes a user interface 131 which provides a surface for inputting one or more setpoints.
  • the interface also allows you to enter a control range adapted to the respective application.
  • a rule area describes a range of measured values in which the stored rule functionality applies. If the control range is exceeded or undershot, for example, the output manipulated variable assumes a value independent of the control functionality.
  • the reason for defining a control range may be, for example, that a maximum or minimum speed of the fan should not be exceeded or undershot, but on the other hand, even with smaller deviations already operation of the fan with maximum or minimum speed for quick compensation makes sense is.
  • the user interface 131 comprises a display via which, for example, the measured or converted actual measured value can be visualized.
  • the display will show the applicable user settings, such as the entered setpoint that the control should achieve.
  • a digital display is used in the embodiment shown.
  • a memory 132 is part of the control electronics 130, in which on the one hand the user inputs, i. the setpoint specifications and the control range are stored.
  • the memory in the embodiment shown contains a control functionality, which is also entered by the user, for example.
  • the user may choose between various controllers stored in memory 132 during manufacture, or the control functionality is fixed and unchangeable.
  • Other embodiments of the invention use hardware controllers, so that no stored control functionality is necessary.
  • the control functionality corresponds to a P-controller, but - depending on the application - the use of other functionalities is possible.
  • the control electronics 130 calculates a manipulated variable which it makes available at the manipulated variable output of the sensor control unit 30.
  • the controller unit 30 defines as the current manipulated variable a voltage value proportional to the degree of deviation of a supplied measured value from the desired value, cf. in the FIG. 3 illustrated control functionality.
  • the manipulated variable moves in a range between 0 and 10 V, wherein a control value of 0 V should cause a standstill of the fan 20, a manipulated variable of 10 V operation of the fan 20 at maximum speed.
  • a control range is set in the case shown, the lower limit corresponds to the target value.
  • a manipulated variable of 0 V is always output when the measured value is smaller than the setpoint, since in the present case, a deviation from the setpoint in this direction is most effectively compensated by a standstill of the fan.
  • the calculated manipulated variable provides the sensor control unit via the line 63 to the - in the embodiment shown in the fan - power electronics component 140 ready.
  • the sensor controller unit 30 receives the necessary for their operation power supply from the power electronics component 140.
  • the line electronics component 140 of the sensor control unit 30 a voltage of 10 V and a current of 10 mA available , Higher voltages / currents normally are not needed by the sensor regulator unit, although some embodiments of the invention may provide for this.
  • the sensor controller unit 30 and the power electronics component are connected via a ground line 62.
  • the lines 61, 62 and 63 are combined in a cable 60 in the embodiment shown. To start up the external sensor control unit, therefore, only the attachment of a single cable is necessary; further connections are not required. Instead of a cable 60 and plug can be used.
  • the power electronics component 140 integrated into the fan 20 has a further connection via which it is connected to the conventional voltage network.
  • the power electronics component 140 receives an AC voltage of 230 V, or a three-phase AC voltage of 400V.
  • a ground line is provided to the power electronics component 140 here.
  • the power electronics component 140 controls the fan 20 based on the manipulated variable.
  • a manipulated variable of 0 V in the present embodiment should correspond to a standstill of the fan 20 and a manipulated variable of 10 V operation with maximum speed; Values of the manipulated variable lying between these extremes are to effect corresponding speeds of rotation of the fan 20 which are between standstill and maximum speed.
  • the power electronics component implements this, for example, by correspondingly modifying the mains voltage via an electronic commutation unit and outputting the thus modified supply voltage to the fan motor 150. The modified supply voltage then directly generates the rotor speed predetermined by the manipulated variable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
EP08017851A 2008-10-10 2008-10-10 Système de réglage Withdrawn EP2175553A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08017851A EP2175553A1 (fr) 2008-10-10 2008-10-10 Système de réglage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08017851A EP2175553A1 (fr) 2008-10-10 2008-10-10 Système de réglage

Publications (1)

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EP2175553A1 true EP2175553A1 (fr) 2010-04-14

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EP08017851A Withdrawn EP2175553A1 (fr) 2008-10-10 2008-10-10 Système de réglage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106253101A (zh) * 2016-08-04 2016-12-21 安徽罗伯特科技股份有限公司 开关站箱体

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1163636A (ja) * 1997-08-20 1999-03-05 Hitachi Ltd 空気調和装置の集中制御装置
EP1164335A1 (fr) * 1999-11-30 2001-12-19 Daikin Industries, Ltd. Telecommande pour conditionneur d'air
US20030064676A1 (en) * 2001-09-26 2003-04-03 Federspiel Clifford Conrad Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems
JP2004204744A (ja) * 2002-12-25 2004-07-22 Aichi Electric Co Ltd 送風装置の駆動制御装置
GB2431303A (en) 2005-10-15 2007-04-18 Ebm Papst Uk Ltd Brushless motor and control unit, suitable for a fan
DE202007001507U1 (de) * 2007-01-29 2007-04-19 Gruner Ag Volumenstromregler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1163636A (ja) * 1997-08-20 1999-03-05 Hitachi Ltd 空気調和装置の集中制御装置
EP1164335A1 (fr) * 1999-11-30 2001-12-19 Daikin Industries, Ltd. Telecommande pour conditionneur d'air
US20030064676A1 (en) * 2001-09-26 2003-04-03 Federspiel Clifford Conrad Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems
JP2004204744A (ja) * 2002-12-25 2004-07-22 Aichi Electric Co Ltd 送風装置の駆動制御装置
GB2431303A (en) 2005-10-15 2007-04-18 Ebm Papst Uk Ltd Brushless motor and control unit, suitable for a fan
DE202007001507U1 (de) * 2007-01-29 2007-04-19 Gruner Ag Volumenstromregler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106253101A (zh) * 2016-08-04 2016-12-21 安徽罗伯特科技股份有限公司 开关站箱体

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