EP3424398B1 - Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant - Google Patents

Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant Download PDF

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Publication number
EP3424398B1
EP3424398B1 EP18177243.5A EP18177243A EP3424398B1 EP 3424398 B1 EP3424398 B1 EP 3424398B1 EP 18177243 A EP18177243 A EP 18177243A EP 3424398 B1 EP3424398 B1 EP 3424398B1
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EP
European Patent Office
Prior art keywords
pump
torque
drive motor
speed
idling
Prior art date
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Active
Application number
EP18177243.5A
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German (de)
English (en)
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EP3424398A1 (fr
Inventor
Raymond Römer
Jörg SKRIPPEK
Stefan Wetzel
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP3424398A1 publication Critical patent/EP3424398A1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/02—Devices for adding soap or other washing agents
    • D06F39/022—Devices for adding soap or other washing agents in a liquid state
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps

Definitions

  • the invention relates to a method for operating a water-bearing household appliance which has a pump for conveying an aqueous liquid, a variable-speed, permanently excited synchronous motor as the pump drive motor and a control unit, and a water-bearing household appliance suitable for carrying out this method.
  • a water-carrying household appliance generally has a pump for conveying aqueous liquids, e.g. It is known to drive a pump in a household appliance using a single-phase synchronous motor. Cases arise in which the water is almost or already completely pumped out and the pump therefore delivers little or no water at all. This usually leads to increased noise emissions and inefficient use of the "drive motor". Methods are therefore specified in the prior art which lead to the pump being switched off in the event of a suddenly dropping load, or at least allow the pump flow to be inferred.
  • a pump in the domestic appliance is driven by the single-phase synchronous motor.
  • the publication DE 10 2010 042 491 A1 describes a pump device for a household appliance, with a drive motor for driving an impeller, the rotor of the drive motor having permanent magnets, and with a circuit arrangement for operating the drive motor, the stator of the drive motor having at least three phase strands and the circuit arrangement for each phase strand an electrical control element for Have control of a current flow through the associated phase strand.
  • the circuit arrangement is designed to control the speed and/or the direction of rotation of the drive motor by activating the control elements.
  • the circuit arrangement is designed to switch off the drive motor when the current intensity of a current falls below a predetermined level and/or when the torque of the drive motor falls below a predetermined level.
  • the circuit arrangement can be designed to regulate the speed of the drive motor as a function of the detected current.
  • the publications DE 10 2008 029 910 B4 or. WO 2009/156326 A2 describe a method for detecting the load state of a fluid-promoting, from a Electric motor-driven pump of a household appliance, the pump being driven by a three-strand, three-phase permanent-magnet electric motor designed as a synchronous motor using vector control, the vector control determining a torque-forming current component from a measured phase current from two of the three phase currents and from this at least one load state of the pump is determined. Setting a pump speed n to a value n I at which a nozzle pressure P of the pump is not sufficient to build up a delivery flow Q is not provided according to these publications.
  • the publication EP 2 918 721 A1 relates to a pumping device for a water-bearing device such as a washing machine or dishwasher with a treatment container for holding washing liquid for treating items to be treated inside the treatment container, for pumping out or pumping around washing liquid, comprising a pump with an electric motor and a rotatable impeller for conveying the liquid, which is connected to a power stage controlled by a control device for controlling the delivery rate, the control device being set up to detect electrical parameters supplied to the pump or the motor and to influence the supply of electrical power or current to the motor as a function of these parameters.
  • the electric power or current consumed by the motor serves as the electrical parameter, with the control device being designed to use the power stage to regulate the electric power or current supplied to the motor as a function of the parameters detected, so that a specified electric power or a preset current.
  • the publication DE 10 2009 002 150 A1 describes a method for operating a water-carrying household appliance, in particular a dishwasher, in which the degree of filter occupancy of a filter system connected in the hydraulic circuit of the household appliance is detected, with washing liquid only being partially drained from the household appliance when it is detected that the level of filter occupancy falls below a predetermined limit.
  • the publication DE 10 2007 030 072 A1 relates to an electric drive device for a water-bearing household appliance and describes that by detecting motor parameters it can be concluded that a pump with a BLDC pump drive motor is idling, in order to react to a snorkeling state by switching it off.
  • the publication DE 44 18 721 A1 describes a control method for suds circulating pumps in household dishwashers, with the help of which the continuity of the volume flow per unit of time and its consistency are monitored and the suds circulating pump drive motor including speed sensor can be regulated in its speed with the help of a phase angle control, with the speed fluctuations and the Motor current consumption fluctuations of the suds circulating pump drive motor are detected.
  • the publication DE 691 10 356 T2 describes a device for measuring the amount of water in a washing machine in which the washing liquid is recirculated and sprayed onto the laundry using a circulation pump.
  • the suction and dry-running status of a circulating pump of a washing machine can be determined, for example, by measuring the current-voltage phase shift.
  • the characteristic variables are pre-programmed in the controller.
  • an object of the present invention to provide a method for operating a water-bearing household appliance with improved determination of a Provide idle load of a pump, in which preferably engine friction, engine temperature and pump delivery pressure are taken into account.
  • the object of the invention was also to provide a water-bearing household appliance suitable for carrying out this method.
  • this object is achieved by a method for operating a water-bearing household appliance and a water-bearing household appliance (also abbreviated as “household appliance” below) according to the independent patent claims.
  • Preferred configurations of the invention are listed in the respective dependent patent claims. Preferred configurations of the method correspond to preferred configurations of the household appliance, even if this is not separately pointed out in each case.
  • the torque M of the pump is measured over a predetermined time period ⁇ t and the mean torque M m measured during this time period is regarded as the idling torque M I .
  • the time period ⁇ t is preferably from 0.2 to 3 seconds, more preferably from 0.5 to 2 seconds and even more preferably from 0.8 to 1.5 seconds.
  • the pump drive motor operates in a regulated range in which the speed n I is greater than a speed n s at a synchronization point in time.
  • a distinction is made in particular between “regulated” and “controlled” operation. In controlled operation, a high electrical current is generally applied immediately, which is then significantly reduced later during regulation (“regulated operation”), for example to approximately 1/3 to 1/2 of the selected value. This leads to power savings.
  • the "synchronization time” is according to the DE 10 2008 029 910 B4 (cf. 3 ) a point in time marked by a lightning bolt in a plot of the impressed current I q against the time t after a controlled start-up, at which the start of a load detection and an idle detection of the pump takes place.
  • the rotor of the pump drive motor often runs in an oil (silicone oil) as the working medium, so there is a gap between the rotor and the wall of the corresponding chamber (can filling). If this chamber leaks, the oil can escape and contaminants can also enter the chamber. In both cases the friction is affected.
  • oil silicone oil
  • a rotor of the pump drive motor is therefore mounted in a liquid working medium, in particular an oil, which is preferably a silicone oil or an oil-water emulsion.
  • the idling torque M I at the speed n I is extrapolated to a comparison torque M N for the speed n N at which the pump has a non-zero flow rate.
  • the speed-dependent and/or temperature-dependent contributions of the magnetic flux density, the engine friction and/or the delivery pressure of the pump are preferably compensated for by the measured no-load load for extrapolation.
  • the initial conditions for determining the idling speed, ie the idling load are known as well as possible.
  • knowing the idle speed determines the evaluation of operating parameters of the pump drive motor when the pump is pumping.
  • the treatment process can be a washing program in a washing machine, for example.
  • engine friction affects idle torque.
  • the idle torque can change more or less quickly over time due to various negative influences, from slow-acting ones such as wear to fast-acting ones such as sudden disturbances, for example dirt. This allows conclusions to be drawn about the condition of the pump and/or the pump drive motor, so that suitable countermeasures can be taken.
  • M I old can be an idle torque stored immediately before or a longer time ago.
  • several consecutive values for the no-load torque can be stored in order to detect possible slowly progressive wear on the pump or pump drive motor.
  • a loss of liquid working medium due to a leak is advantageously concluded when idle torque M I decreases by more than a predetermined permissible value ⁇ M loss .
  • the improved determination of the no-load speed allows the water-bearing household appliance to be operated with improved accuracy in terms of pump operation.
  • a method is therefore preferred according to the invention in which the additional torque M F required to convey the aqueous liquid is used to determine the flow rate Q, which is obtained from the difference between a measured torque M at a speed n N at which the pump a has a flow rate different from zero, and the idling torque M I or an extrapolated comparison torque M N results.
  • the extrapolated comparison torque M N it is taken into account that some of the influencing factors for the no-load speed change when the speed increases, for example a nominal speed for pumping a specific quantity of aqueous liquid, so that even more precise operation of the pump is possible.
  • the aqueous liquid can also be referred to in general terms as “delivery medium” and in particular can also be a single-phase or multi-phase delivery medium that contains an aqueous liquid and/or air.
  • delivery medium can also be a single-phase or multi-phase delivery medium that contains an aqueous liquid and/or air.
  • air can be contained in the conveying medium, in particular in the form of foam.
  • the density p of the pumped medium decreases with increasing air or foam content.
  • Density p of the pumped medium means in particular the density of the pumped medium in the pump.
  • the density p of the pumped medium can be determined in particular on the basis of the power consumption P of the pump.
  • a relationship between the power consumption P and the density p is advantageously stored in the control device for different values of the speed n N . Due to the inventively improved determination of the idle speed, the density p can be determined more precisely, so that overall, for example, a washing process in a washing machine can be better tracked and controlled.
  • a method is preferred in which the motor current I Q of a pump drive motor is measured and evaluated to monitor the density p of the pumped medium. This is sometimes also referred to as controller current I Q or torque-forming current component I_q.
  • a water-bearing household appliance in which a rotor of the pump drive motor is mounted in a liquid working medium.
  • the water-bearing household appliance is not restricted according to the invention. However, it is preferably selected from the group consisting of a washing machine, a washer-dryer, a tumble dryer and a dishwasher.
  • Washing machines, washer dryers and tumble dryers generally contain a drum for receiving items of laundry to be treated, in particular to be cleaned and/or dried.
  • the pump is connected to the tub via a tub.
  • the aqueous liquid conveyed by the pump can be pumped out or, preferably, fed back to the tub in a circular operation.
  • Such a washing machine has a corresponding circuit for an aqueous liquid for circuit operation.
  • the invention has numerous advantages.
  • the invention enables the idle power of a pump used in a water-conducting household appliance to be determined, taking into account engine friction, engine temperature and pump delivery pressure. This makes it possible to take into account the current no-load power, which is constantly changing due to the influence of temperature, signs of wear and media-related friction and has a major impact on the accuracy of all methods.
  • the method according to the invention makes it possible to clearly determine this no-load power at the beginning of each pumping process.
  • the invention enables the improved determination of various error states of a pump used in a water-conducting household appliance.
  • the measured value for the idle torque can be used as follows: Low-pass filtered or as a moving average value for comparison with the no-load torque in order to compensate for sudden changes in the current.
  • Converted as a volume flow using a time integral can be used to determine the conveyed quantity, to assess the absorbency of the items of laundry in the drum in comparison with a measured flushing quantity or to detect device leaks, in this case as an addition or redundancy to an aqua-stop float.
  • the amount of water in the water-bearing domestic appliance can be determined precisely in order to advantageously influence a spin speed in a washing machine. In a washer-dryer, the amount of condensation water that has formed can be determined with improved accuracy.
  • the measured value for the no-load torque in the presence of a timeout timer, can be used to detect clogged waterways, a blocked water inlet or an excessively high hanging height of the drain hose. An error message or customer information can then follow. If necessary, the speed of the pump drive motor can be increased in order to clear a blockage or to overcome the selected high suspension height.
  • the measured value for the no-load torque can be used to detect cross-sectional constrictions in the waterways, defects in the impeller of the pump or a hose extension connected by the customer with improved accuracy based on the average flow rate.
  • an error message or customer information can be used as a measure.
  • the speed can also be increased in order to shift the operating point to a larger flow rate Q.
  • a washing machine 1 as a non-limiting example of a water-bearing household appliance, which has a tub 2 in which a drum 3 is rotatably mounted and can be driven by a drum drive motor 5 .
  • the axis of rotation 19 of the drum 3 is or can be directed upwards from the horizontal at a small angle (e.g. 13°), so that the user of the washing machine 1 has easier access and insight into the interior of the drum 3 Has.
  • This arrangement in cooperation with laundry drivers 14 and scooping devices 17 for the aqueous liquid 7 containing detergent, eg suds, on the inner surface of the drum shell also intensifies the flooding of the items of laundry 4 with suds 7 .
  • the washing machine 1 also has a water supply system that includes a water connection fitting for the domestic water network 20, an electrically controllable valve 21 and a supply line 13 to the tub 2, which may also have a Detergent dispensing tray 12 can be performed, from which the incoming water can transport detergent portions into the tub 2.
  • the valve 21 and the heating device 16 can be controlled by a control unit 8 depending on a program flow chart that is based on a time program and/or on the achievement of certain Measured values of parameters such as liquor level, liquor temperature, drum speed, etc. within the washing machine 1 can be bound.
  • 9 denotes a motor-drum control unit which can determine and store, in particular, the drum speed n T , the drive current value I AT and a drum rotation period ⁇ t T .
  • the hydrostatic pressure p results from the fill level of the free liquor 7 forming in the tub 2 and the already soaked laundry items to be cleaned.
  • the washing machine 1 of the embodiment shown here comprises a measuring device 15 for determining the amount of water filled in, for example a water meter or a flow meter.
  • a measuring device 15 for determining the amount of water filled in, for example a water meter or a flow meter.
  • the amount of water that has flowed in is calculated in connection with a recorded filling time.
  • the flow can also be determined by measuring the time it takes for a specified level to be reached, which corresponds to a certain fixed amount of water.
  • a scale for determining the amount of laundry items put in. Allow in the embodiment shown here Flow meter and balance an even better design of a rinsing phase or a spin phase taking place therein.
  • the quantity and/or type of laundry items 4 in the drum 3 can be inferred by comparing the quantity of water filled in with the quantity of water pumped out.
  • 11 denotes a display device with which, for example, process parameters, in particular a washing program running or a power consumption P of the pump drive motor 26, can be displayed.
  • the radial centrifugal pump 18 means a pump, in this embodiment e.g. a radial centrifugal pump, for pumping the aqueous liquid 7 out of the tub 2 .
  • the radial centrifugal pump 18 used here is connected to the control unit 8 .
  • the control unit 8 is set up to record and monitor the power consumption P of the radial centrifugal pump 18, to determine the drive current value I, i.e. the impressed electric current, and to regulate the speed n of the radial centrifugal pump 18.
  • figure 2 shows the dependency of a torque M or an applied electric current I of the pump drive motor on the flow rate Q, where Q is the amount per unit time of a pumped aqueous liquid, and the dependency of the no-load torque on the pumped medium.
  • 27 is a characteristic curve for the dependence of the torque M or applied electric current I of the pump drive motor on the flow rate Q, with only the portion of the torque I going beyond the idling torque M I 28 being used for conveying, i.e. pumping, the aqueous liquid.
  • the idling torque M I 28 is greater for a pump filled with an aqueous liquid than for a partially aerated pump (cf. point 29) or for a aerated, free-running pump (cf. point 30).
  • the speed n of the pump is increased to an idle speed n I at which the pump drive motor works in the controlled area, but the port pressure of the pump is not yet sufficient to handle the aqueous liquid build up a flow.
  • the speed is exceeded at the synchronization point in time of a regulator of the control unit, so that the regulator or the pump drive motor changes to the regulated range.
  • the comparison value for ongoing operation ie pump operation at a higher speed for conveying the aqueous liquid
  • 3 shows the speed dependency of various influencing factors in the form of plots of an impressed electric current I of the pump drive motor and the speed n. Based on 3 it can be shown how the idle torque M I determined at an idle speed can be extrapolated to a nominal speed n of the pump subsequently used in actual pumping.
  • Characteristic curve 33 also takes into account a here characteristic not shown separately for a proportion of the delivery pressure that increases quadratically with the speed n.
  • the characteristic curve 34 results from the addition of a proportion of the impressed current I, which is due to the delivery flow, to the characteristic curve 33.
  • the extrapolation to a nominal speed n of the pump used during actual pumping can be illustrated as follows as an example. It is assumed that the engine temperature is unknown but temporarily constant at the time the method according to the invention is carried out, which in this context can also be referred to as initialization. As mentioned in 3 the four components of the pump motor load, expressed here as an applied current I, are shown over the speed n of the pump drive motor.
  • the temperature-dependent magnetic flux density of the rotor magnets and thus the reciprocally proportional electrical current to be impressed are independent of the speed n, although their point of intersection with the ordinate is generally known. This is determined during initialization and thus taken into account.
  • the engine friction is linearly dependent on the speed, with the starting point in the coordinate origin.
  • the rotor of the pump drive motor generally a permanent magnet, is generally mounted in a liquid working medium in the pump drive motors used in water-bearing household appliances.
  • a rotor is preferably mounted there in a running or canned tube in silicone oil or another working medium. Therefore, the rotor is sometimes also referred to as a wet rotor. Due to the generally narrow gap between the running tube and the rotor, as well as based on measurement results, it can be assumed that a Couette flow is set up there as a gap flow. In this gap flow, the fluid friction increases proportionally to the flow velocity, despite the turbulence. For this reason, the characteristic curve 32, which represents the sum of the contribution from magnetic flux density and motor friction, is linear, especially since bearing friction or friction on seals is generally negligible compared to fluid friction.
  • the characteristic curve of the delivery pressure generated by the impeller of the pump is generally quadratically dependent on the speed of the impeller.
  • the characteristic curve 33 also takes into account the delivery pressure.
  • the corresponding quadratic characteristic intersects the abscissa.
  • a current value I referred to as the calibration measured value 35 is first measured at an idle speed n I , e.g. 1000 revolutions per minute contains.
  • n I e.g. 1000 revolutions per minute contains.
  • M liquid M idle + b liquid n noun ⁇ n idle + c liquid n noun 2 ⁇ n idle 2 is extrapolated to the idle torque M I 37 of the nominal speed, for example 2800 revolutions per minute.
  • the idling torque M liquid thus determined for the nominal speed used for pumping corresponds to the load absorbed by the pump at 0 l/min flow rate Q as the starting value of the torque (iq) flow rate characteristic, e.g. characteristic 27 of 2 .
  • figure 5 shows the influence of the motor temperature on the loss terms, i.e. motor friction, magnetic flux, where the load torque , i.e. the torque directly associated with the pumping of aqueous liquid, is kept constant.
  • Graph 39 shows the influence of the temperature dependency of the magnetic flux, which linearly decreases with increasing temperature, so that a current I to be impressed, also referred to herein as I q , increases linearly.
  • Graph 40 shows the temperature dependence of engine friction. Due to the operating medium generally used, eg a silicone oil, the engine friction decreases due to the viscosity of the silicone oil decreasing with temperature, which is reflected in the decrease in a current I to be impressed with increasing temperature T_packet.
  • Graph 38 shows the influence of the load moment, which is not dependent on the temperature.
  • figure 5 thus describes the influence of the engine temperature on the loss terms taken into account by the method described herein, which essentially represents a calibrating initialization. If the motor heats up from room temperature due to the load, the winding temperature first increases. Packet temperature generally follows with a lag time offset. The temperature of a can filling that is usually used, ie the use of a liquid operating medium, usually an oil-water emulsion, described for embodiments of the invention, behaves similarly to the pack temperature, which is easier to measure in terms of measurement technology.
  • the magnetic flux density B decreases proportionally to the temperature, which is why the controller, ie in particular a control unit of the water-based household appliance, has to impress a reciprocally proportional current ⁇ I flux in order to maintain the speed at a constant load.
  • the viscosity of the can filling behaves exponentially degressively with temperature. Since a Couette flow presumably prevails in the can, the friction and thus the friction torque I friction behave correspondingly degressively.
  • the load moment is in 3 has been assumed to be constant, which can be achieved experimentally, for example by using a torque brake.
  • the curve or graph 41 therefore represents the result of adding the three load terms.
  • the curve 41 shows the resulting torque M (I tot ) of the pump drive motor in stationary operation as a function of the temperature. Experimentally, it was found that the typical course of curve 41 with local minima was shown at average package temperatures or average temperatures of the operating medium for different loads.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (13)

  1. Procédé de fonctionnement d'un appareil électroménager à circulation d'eau (1), qui comprend une pompe (18) pour transporter un liquide aqueux (7), un moteur synchrone à aimant permanent, à vitesse de rotation variable à titre de moteur d'entraînement de pompe (26) et une unité de commande (8), le procédé comprenant les étapes suivantes :
    (a) réglage d'une vitesse de rotation de pompe n à une valeur nI, à laquelle une pression à la buse p de la pompe (18) n'est pas suffisante pour produire un débit de refoulement Q, et
    (b) mesure d'un couple de rotation M de la pompe (18) à titre de grandeur pour un couple de rotation de marche à vide MI, dans lequel la mesure du couple de rotation M s'effectue par une mesure d'une grandeur électrique du moteur d'entraînement de pompe (26), et une intensité de courant I est mesurée dans le moteur d'entraînement de pompe (26) en tant qu'intensité de courant de marche à vide II et le couple de rotation MI est déterminé sur la base d'une relation entre l'intensité de courant I et le couple de rotation M enregistrée dans l'unité de commande (8).
  2. Procédé selon la revendication 1, caractérisé en ce que le couple de rotation M de la pompe (18) est mesuré pendant un intervalle de temps prédéterminé Δt et le couple de rotation moyen Mm mesuré dans cet intervalle de temps est considéré comme le couple de rotation de marche à vide MI.
  3. Procédé selon la revendication 2, caractérisé en ce que l'intervalle de temps Δt est de 0,2 à 3 sec.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le moteur d'entraînement de pompe (26) travaille dans une plage régulée, dans laquelle la vitesse de rotation nI est supérieure à une vitesse de rotation ns à un moment de synchronisation.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'un rotor du moteur d'entraînement de pompe (26) est logé dans un milieu de travail liquide.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le couple de rotation de marche à vide MI à la vitesse de rotation nI est extrapolé sur un couple de rotation de comparaison MN pour la vitesse de rotation nN, à laquelle la pompe (18) a un débit de refoulement différent de zéro.
  7. Procédé selon la revendication 6, caractérisé en ce que, pour l'extrapolation, on prend en considération les contributions de la densité de flux magnétique, de friction du moteur et/ou de la pression de refoulement de la pompe (18) en fonction de la vitesse de rotation et/ou de la température.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'il est exécuté avant chaque pompage de liquide aqueux (7) dans un procédé de traitement dans l'appareil électroménager (1) à circulation d'eau.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le couple de rotation de marche à vide MI est comparé avec au moins un couple de rotation de marche à vide MI old enregistré précédemment, la différence ΔM = |MI - MI old| est déterminée et, dans le cas où ΔM > ΔMlim, ΔMlim étant une valeur maximale admissible prédéterminée pour cette différence, il est conclu à un fonctionnement défectueux de la pompe (18).
  10. Procédé selon la revendication 9, caractérisé en ce que, dans le cas d'un moteur d'entraînement de pompe (26) comprenant un rotor immergé dans un milieu de travail liquide, en cas d'une diminution du couple de rotation de marche à vide MI de plus d'une valeur admissible prédéterminée ΔMloss, il est conclu à une perte de milieu de travail liquide due à un défaut d'étanchéité.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que, pour déterminer le débit de refoulement Q, on se sert du couple de rotation supplémentaire MF nécessaire pour transporter le liquide aqueux (7), qui résulte de la différence entre un couple de rotation M mesuré à une vitesse de rotation nN, à laquelle la pompe (18) a un débit de refoulement différent de zéro, et le couple de rotation de marche à vide MI ou un couple de rotation de comparaison extrapolé MN.
  12. Appareil ménager à circulation d'eau (1), comprenant une pompe (18) pour transporter des liquides aqueux (7), un moteur synchrone à aimant permanent, à vitesse de rotation variable à titre de moteur d'entraînement de pompe (26) et une unité de commande (8),
    caractérisé en ce que l'unité de commande (8) est configurée pour exécuter un procédé comprenant les étapes suivantes :
    (a) réglage d'une vitesse de rotation de pompe n à une valeur nI, à laquelle une pression à la buse p de la pompe (18) n'est pas suffisante pour produire un débit de refoulement Q, et
    (b) mesure d'un couple de rotation M de la pompe (18) à titre de grandeur de couple de rotation de marche à vide MI, dans lequel la mesure du couple de rotation M s'effectue par une mesure d'une grandeur électrique du moteur d'entraînement de pompe (26), et une intensité de courant I est mesurée dans le moteur d'entraînement de pompe (26) en tant qu'intensité de courant de marche à vide II et le couple de rotation MI est déterminé sur la base d'une relation entre l'intensité de courant I et le couple de rotation M enregistrée dans l'unité de commande (8).
  13. Appareil électroménager à circulation d'eau (1) selon la revendication 12, caractérisé en ce qu'un rotor du moteur d'entraînement de pompe (26) est logé dans un milieu de travail liquide.
EP18177243.5A 2017-07-06 2018-06-12 Procédé de fonctionnement d'un appareil électroménager à circulation d'eau à détermination de la durée de marche à vide d'une pompe améliorée et appareil électroménager correspondant Active EP3424398B1 (fr)

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CN110974104B (zh) * 2019-12-13 2020-12-25 珠海格力电器股份有限公司 洗碗机补水控制方法、装置、存储介质及洗碗机
BE1030863B1 (de) * 2022-09-12 2024-04-08 Miele & Cie Abpumpen von Flüssigkeiten bei Haushaltsgeräten
EP4335349A1 (fr) * 2022-09-09 2024-03-13 Miele & Cie. KG Procédé de pompage de liquides à partir d'appareils ménagers

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PL3424398T3 (pl) 2023-02-06
EP3424398A1 (fr) 2019-01-09
DE102017211571A1 (de) 2019-01-10
CN109208266A (zh) 2019-01-15

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