WO2013167488A2 - Procédé permettant de faire fonctionner un sèche-linge à régime variable du moteur d'entraînement et sèche-linge permettant la mise en oeuvre dudit procédé - Google Patents

Procédé permettant de faire fonctionner un sèche-linge à régime variable du moteur d'entraînement et sèche-linge permettant la mise en oeuvre dudit procédé Download PDF

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Publication number
WO2013167488A2
WO2013167488A2 PCT/EP2013/059256 EP2013059256W WO2013167488A2 WO 2013167488 A2 WO2013167488 A2 WO 2013167488A2 EP 2013059256 W EP2013059256 W EP 2013059256W WO 2013167488 A2 WO2013167488 A2 WO 2013167488A2
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WO
WIPO (PCT)
Prior art keywords
speed
process air
drive motor
phase
air blower
Prior art date
Application number
PCT/EP2013/059256
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German (de)
English (en)
Other versions
WO2013167488A3 (fr
Inventor
Klaus Grunert
Uwe-Jens Krausch
Günter Steffens
Andreas Stolze
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
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Filing date
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Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Publication of WO2013167488A2 publication Critical patent/WO2013167488A2/fr
Publication of WO2013167488A3 publication Critical patent/WO2013167488A3/fr

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Classifications

    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving arrangements
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/30—Blowers
    • 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
    • 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
    • D06F2105/48—Drum speed

Definitions

  • the invention relates to a method for operating a variable speed dryer of a drive motor and a suitable for carrying out this process Trockner.
  • the invention particularly relates to a method for operating a dryer with a program control, a drum for laundry to be dried, a process air duct in which a process air blower for the transport of the process air and a heater for heating the process air, and with a variable speed drive motor, the the drum and the process air blower, the method comprising a heating phase, a quasi-stationary drying phase and a cooling phase, and a particularly suitable for carrying out this method dryer.
  • process air In a dryer, air (so-called process air) is passed through a process air blower via a heater in a drum containing the laundry items to be dried as a drying chamber.
  • the hot process air absorbs moisture from the items to be dried.
  • the moist, warm process air In an exhaust air dryer, the moist, warm process air is directed to the outside, for example, in a room or by means of a hose from the installation room addition.
  • a condensation dryer on the other hand, the moist, warm process air is passed, after passing through the drum, into a heat exchanger, which is usually preceded by a lint filter.
  • the moist, warm process air is cooled, so that the water contained in it condenses.
  • the condensed water (condensate) is then usually collected in a suitable container and the cooled and dried air again fed to the heater and then the drum.
  • the drying process in a tumble dryer is generally divided into three phases.
  • a heating phase first takes place during which the temperature of the process air rises until a certain temperature value is reached.
  • a quasi-stationary drying phase in which the temperature of the process air is essentially constant.
  • the drying process is then completed with a cooling phase in which the heating is generally switched off.
  • the process air blower generally remains switched on during the cooling phase in order to exploit the residual thermal energy still present in the drum and process air circuit.
  • Such a drying process is known to be very energy consuming. Thus, it is of great interest to reduce the energy consumption of drying processes in order to save costs and to protect the environment. against this background, it is known to use only one motor for driving the drum and the process air blower ("single engine concept").
  • DE 199 04 993 A1 discloses a condensation clothes dryer with a single motor for driving drum and process air and cooling air blower.
  • the drive with a single motor is usually problematic in that during the heating phase, a strong heat release would take place when the cooling air blower generates a strong cooling air flow, on the other hand, however, a strong process air flow is desired.
  • This problem is overcome by DE 199 04 993 A1, in that the blower wheel of the process air blower has a straight-shifter design, so that it has no preferential direction of rotation, whereas the blower wheel of the cooling-air blower has curved vanes and thus a preferential direction of rotation.
  • the motor is operated in a direction of rotation which is opposite to the preferred direction of rotation of the cooling air blower.
  • DE 10 2008 019 921 A1 describes a tumble dryer with an electric machine which drives at least the drum, in which the rotational speed of the electric machine is varied by a control effected by a control and / or regulating unit.
  • the electric machine can also additionally drive at least the process air blower.
  • various speed work areas or drying programs are described, so that the electric machine is operated in each case with a speed in certain ranges of values.
  • US Pat. No. 6,745,495 discloses a clothes dryer having a first motor that drives the drum and a variable speed motor that drives the process air blower.
  • the dryer may also include a temperature and / or pressure sensor so that the speed of the variable speed motor that drives the process air blower is controlled by a controller depending on the measured temperature and / or pressure values.
  • a controller depending on the measured temperature and / or pressure values.
  • EP 1 775 368 B1 discloses a clothes dryer with an asynchronous three-phase motor which drives the drum and an electronic commutation motor, in particular of the permanent magnet type, which drives the process air blower.
  • the process air volume flow is adjusted by the speed of the process air blower, so that the process air volume flow is lowest, for example during the last drying phase.
  • EP 1 688 532 B1 describes a method for controlling the operation of a tumble dryer, in which first the process air flow in the process air cycle is determined, this is then compared with a desired process air flow and then the speed of the motor that drives the process air blower is adjusted in such a way that the desired process air flow is achieved. At least one of the parameters engine speed, air temperature and engine speed is used to determine the process air flow.
  • the motor that drives the process air blower is preferably a brushless permanent magnet motor. Again, the use of various motors for driving the drum and the process air blower is described, which in turn increases energy consumption.
  • DE 10 2009 026 649 A1 describes a method for controlling a drying process in a domestic appliance for drying a moist material, in which a process air flow in a process air duct is conveyed by means of a process air blower and the drying process is started with a heating phase, before it enters a drying process Main drying phase passes.
  • the process air blower is at least temporarily operated at a higher speed than in the main drying phase, so that the heating phase of a drying process can be completed as quickly as possible.
  • a brushless DC motor is particularly preferably used. There is no information that a variable speed drive motor is provided, which drives the drum and the process air blower.
  • Post-published EP 2 549 009 A1 describes a method for controlling the operation of a tumble dryer, comprising a drying chamber and a process air system comprising a fan with a variable speed. The speed of the water removal is evaluated and the speed of the blower adjusted accordingly. About in the quasi-stationary drying phase and in the cooling phase to be set speeds of the process air blower are not specified.
  • the invention thus relates to a method for operating a dryer with a program control, a drum for items to be dried, a process air duct in which a process air blower for the transport of the process air and a heater for heating the process air, and with a variable speed drive motor, which drives the drum and the process air blower, the method comprising a heating phase, a quasi-stationary drying phase and a cooling phase, and wherein in the quasi-stationary drying phase the variable speed drive motor is operated at an average speed CH and the process air blower is operated at a medium speed ooi, and during the Cooling phase, at least temporarily, the engine with a speed a 2 less than CH and the process air fan with a speed ⁇ 2 is less than ooi operated.
  • Dryer here means in particular a dryer for items of laundry, wherein the type of clothes dryer is not restricted according to the invention and may also include washer-dryer, so household appliances for washing and drying laundry.
  • exhaust air dryers and condensation dryers are meant, wherein condensation dryers are preferred according to the invention.
  • Variable speed drive motor herein means that the speed of the drive motor during the process according to the invention, ie the drying process, can be varied.
  • the transition between a heating phase and a quasi-stationary drying phase is generally characterized by the attainment of a predetermined temperature of the process air temperature. This can be, for example, the temperature at which a temporal change in the temperature of the process air reaches a minimum. It Then, in the quasi-stationary drying phase, the wet laundry items would be dried at an approximately constant temperature. Only then, if heating and process air blower would be operated unchanged, a further increase in the process air temperature would take place. According to the invention, the method would preferably be operated such that a maximum permissible temperature T max of the process air is not exceeded.
  • the cooling phase is generally the last phase of the drying process, in which the heating is switched off, at least temporarily.
  • the cooling phase generally begins with a significant reduction in heating power of the heater or shutdown of the heater at the end of the quasi-stationary drying phase.
  • the heater is turned off in the cooling phase.
  • a reduction of the speed of the variable-speed drive motor causes in the method according to the invention a reduction of the speed of the process air blower.
  • the speed ai of the variable-speed drive motor is preferably in a speed range from 500 rpm to 4000 rpm and particularly preferably in a speed range from 2800 rpm to 3500 rpm.
  • the rotational speed a 2 of the variable-speed drive motor is preferably in a rotational speed range from 1800 rpm to 2500 rpm and particularly preferably in a rotational speed range from 1900 rpm to 2300 rpm.
  • ai is equal to ooi and a 2 is equal to oo 2 , ie that the process air blower and the variable-speed drive motor are operated at the same speed.
  • variable-speed drive motor with a mean speed a 3 is less than CH and the process air blower with a speed ⁇ 3 is operated smaller than ooi.
  • This mode of operation is preferred when in the quasi-stationary drying phase the heater is operated at a reduced power. This is especially advantageous when the to be dried Laundry items are dried at least superficially. Then it can be very advantageous to reduce the heating, since an increase in the temperature of the process air here would not accelerate a drying process would result.
  • the process air blower in the quasi-stationary drying phase, is operated at a reduced rotational speed in at least one time interval by the variable-speed drive motor being operated at a reduced rotational speed a 3 .
  • the at least one time segment in the quasi-stationary drying phase in which the process air blower is operated at a reduced rotational speed preferably corresponds to a period in the quasi-stationary drying phase in which the heating power is reduced.
  • the heating power is reduced when there is no more surface moisture on the laundry. This can be determined, for example, by a sudden increase in the temperature of the process air emerging from the drum.
  • the speed of the engine is preferably adapted to the maximum permissible process air temperature T max . This can be done by measuring the current process air temperature with a temperature sensor and reducing the heating power and the engine speed if a threshold value stored or determined in the program control is exceeded. On the other hand, depending on the drying program used by the user, fixed periods of time at which the engine speed is reduced can already be stored in the program control. However, since the heating is still operated, albeit to a lesser extent, it is advantageous that a 3 is greater than a 2 and ⁇ 3 is greater than oo 2 .
  • the drive motor is at least temporarily operated during the cooling phase at a speed a 2 less than CH and the process air blower with a speed oo 2 smaller than ⁇ - ⁇ . It is preferred that the rotational speeds a 2 and ⁇ 2 are average rotational speeds in the cooling phase.
  • variable-speed drive motor with a speed a 2 smaller than ⁇ and the process air blower with a speed ⁇ 2 smaller than ooi means that the speeds a 2 and ⁇ 2 can also be increased again.
  • a time-dependent speed profile for the drive motor and the process air blower and preferably stored in the program control of the dryer.
  • "temporary operation” means that in the program control for a drying program at least a period of time is predetermined in which the process air blower is operated at a reduced speed by operating the drive motor at a reduced speed as described means that in each case for a user to be selected by the drying program in the program control, a value for a time t S tart is deposited, to which the above period begins, and a value At indicating the duration of the at least one period Instead of the value At, a time t En de, to which the above-mentioned time period ends, can be stored in the program control, in which case:
  • the value tstart is preferably specified as a function of the time of program start t 0 .
  • the value t S tart may also be stored as a function of another time of the drying program, for example as a function of the time at which the quasi-stationary drying phase t quasistatTrock begins .
  • the temperature of the process air and / or a loading of the drum with laundry items are taken into account.
  • the temperature of the process air should preferably not exceed a predetermined upper limit T max .
  • This upper limit generally differs for laundry items of different types, with the upper limit of the temperature T max being generally lower for delicate laundry items.
  • the rotational speeds a 2 and ⁇ 2 are set as a function of a temperature of the process air measured with a temperature sensor and / or a loading of the drum.
  • the at least one time interval in which the process air blower is operated at a reduced rotational speed by the drive motor being operated at a reduced rotational speed is determined as a function of the temperature of the process air.
  • the dryer has at least one temperature sensor arranged in the process air circuit. This temperature sensor is preferably arranged at the drum inlet, that is to say at the point at which the process air from the process air duct passes into the drum, or at the drum outlet, ie at the point at which the process air from the drum passes into the process air duct.
  • the temperature sensor may be an NTC temperature sensor, but according to the invention there are no limits to the type of temperature sensor.
  • the drive motor and thus also the process air blower are operated at a reduced speed. This can happen, in particular, until the measured temperature falls below the aforementioned threshold value or another specific temperature value.
  • the time interval of the reduced engine speed can be determined not only as a function of individual temperature values but also as a function of a temperature profile.
  • This embodiment has the advantage that the rotational speed of the drive motor ("engine speed") and thus also a drum and blower speed can each be adapted to the current temperature conditions, for example, the engine speed can be adapted to a predefined value for the maximum allowable process air temperature and excessive temperature reduction can be avoided.
  • At least one time period in which the process air blower is operated at a reduced rotational speed ⁇ 2 by operating the engine at a reduced rotational speed a 2 is determined as a function of the load of the dryer with laundry items to be dried.
  • the loading of the dryer can be determined by means of various parameters, for example via the weight of the drum, moisture contentV course and load of the drive motor, for example as a function of engine speed and / or engine torque.
  • different speed profiles of the drive motor for different loads can be stored in the program control, which are then used accordingly to achieve an optimal result.
  • a speed reduction and / or a duration of the abovementioned period of reduced engine speed can also be determined jointly as a function of temperature and load. This allows a particularly good adaptation to the current state of drying and thus a particularly energy-saving process.
  • the value of the reduced speed or the variation of the value of the reduced speed over the cooling phase or a time period thereof can also be used be determined advantageously depending on the temperature and / or the loading. This made possible light that, for example, in a strong increase in temperature, the speed is less reduced, for example, as a stronger cooling is desired.
  • the speed can be reduced less.
  • the drive motor is operated only in one direction of rotation during an entire drying program. In this way, conditional wear and extensions of the drying program are avoided by a change of direction.
  • variable-speed drive motor used in the method according to the invention is not restricted. However, it has proved to be particularly advantageous if the variable-speed drive motor is a brushless synchronous motor.
  • Brushless synchronous motors (BLDC or PMS motors) have a relatively high efficiency and are therefore very energy efficient.
  • the speed of the process air blower can be set as desired without much effort by such a motor.
  • the inertia of the rotor of BLDC motors is comparatively low, so that a good dynamic characteristic is achieved.
  • brushless drive motors are relatively low maintenance, since there are no brushes as wearing parts. This extends the life of the drive motor and thus of the dryer.
  • such motors can be installed in hard to reach places.
  • the ratio of output power to size is particularly high for BLDC motors, which allows a comparatively small footprint.
  • a dryer which has a heat exchanger. It is then preferred that a cooling medium is passed through the heat exchanger during a drying process.
  • the cooling medium may be, for example, the refrigerant of a heat pump or cooling air of an air-to-air heat exchanger.
  • an air-air heat exchanger is preferably used, so that the cooling medium is preferably cooling air.
  • a cooling air duct is then present in the heat exchanger, through the air, in particular from a mounting room of the dryer, as a cooling medium by means of a cooling air blower. is passed through.
  • the cooling air blower preferably has a preferred direction of rotation.
  • the cooling air is then passed through the cooling air duct, that the cooling air blower is operated by the speed of the cooling air blower is less in the cooling phase than in the quasi-stationary dry phase.
  • variable-speed drive motor additionally drives a cooling-air blower in a cooling-air duct of an air-to-air heat exchanger.
  • the speed of the drive motor largely corresponds to the speed of the cooling air blower. If the process air blower, cooling air blower and drum are driven by the same drive motor, the volume flow of the cooling air is reduced whenever the flow rate of the process air is reduced. Since too much and / or too rapid cooling of the process air is to be avoided just by reducing the process air flow and thus the residual heat should be better utilized, this effect is further supported by a simultaneous reduction of the cooling air volume flow.
  • a reduced speed of the motor is in a speed range of 1800 to 2500 rpm.
  • the speed of the process air blower and possibly the cooling air blower is preferably in the speed range from 1800 to 2500 U / min.
  • the process air gradually cools down. It is therefore preferred that the rotational speeds a 2 and ⁇ 2 decrease continuously during the cooling phase.
  • an energy saving can be achieved because only one drive motor for driving the drum and the process air blower is used by the reduced speed of the process air blower in the cooling phase in the drum and in the process air circuit residual heat can be better utilized.
  • the reduced speed of the variable-speed drive motor or the process air blower requires a lower process air volume flow.
  • the laundry items are cooled more slowly, which also in the cooling phase still a significant moisture removal
  • the laundry may take place and the heating may also be switched off earlier in the drying process.
  • the duration of the drying process is not extended altogether.
  • the speed of the drum is much lower than the speed of the motor, which can be achieved by a strong reduction. This can be done, for example, in the ratio 1: 55, so that the drum at a speed of the engine of speed of 2750 U / min has a speed of 50 rev / min.
  • the effects of the reduced speed of the drive motor on the laundry case in the drum are comparatively low.
  • the drive power for the drum is reduced according to the invention in the cooling phase, which additionally saves energy.
  • the process air blower is particularly preferably operated at a reduced rotational speed, ie a reduced rotational speed compared to an average rotational speed CH in the quasi-stationary drying phase, by the variable-speed drive motor having a reduced rotational speed, ie one compared to an average rotational speed in the quasi-stationary drying phase, reduced speed is operated.
  • the heating phase is the first phase of the drying process, during which the temperature of the process air rises until a certain temperature is reached.
  • the engine speed can be reduced in various ways in the context of the invention.
  • the rotational speed ⁇ is lowered to a constant value which is below the average rotational speed CH during the quasi-stationary drying phase.
  • the rotational speed ⁇ of the drive motor is increasingly reduced during the cooling phase.
  • a process air duct in which there are a process air blower for the transport of the process air and a heater for heating the process air, and with a variable speed drive motor which drives the drum and the process air blower, wherein the Progr amm Kunststoffung is set up to carry out a method comprising a heating phase, a quasi-stationary drying phase and a cooling phase, and wherein in the quasi-stationary drying phase of the variable speed drive motor with an average speed CH and the process air blower is operated at a medium speed ooi, and during the Cooling phase at least temporarily the variable speed drive motor with a speed a 2 is less than CH and the process air fan with a speed ⁇ 2 is less than ooi operated.
  • variable-speed drive motor is not limited, as long as a variation of its speed can be achieved. As mentioned, however, it has proved to be particularly advantageous if a BLDC motor is used as the drive motor.
  • a BLDC motor is a brushless synchronous motor (brushless DC motor) equipped with a permanent magnet rotor.
  • PMS motor Another name for this motor is "PMS motor", where "PMS” stands for “permanent magnet synchronous.”
  • the fixed stator of such a motor comprises coils that are controlled by an electronic circuit offset in time to create a rotating field
  • BLDC motors it is possible to make the electronic commutation dependent on the rotor position, the rotor speed and the torque, using sensor-controlled or sensorless detection to detect the rotor position and speed.
  • a BLDC motor as a motor makes it possible to change the speed in a simple manner and in particular also a high speed.
  • a speed a 2 of the motor in the cooling phase can be set in a simple manner, which is smaller than a speed CH in the quasi-stationary drying phase.
  • the rotational speed in the cooling phase is preferably about 20 to 50% lower than in the quasi-stationary drying phase.
  • the dryer also has a display device for different states of the dryer.
  • a display device for different states of the dryer.
  • an optical display device is preferably used.
  • the display device can provide information about the operation of the dryer by outputting a text or by illuminating different-colored light-emitting diodes, for example via the sequence of a method according to the invention with an optimized cooling phase of the dryer.
  • the dryer according to the invention preferably has a heat exchanger, which is particularly preferably an air-to-air heat exchanger.
  • the dryer has an air-to-air heat exchanger with a cooling air duct, in which a cooling air blower is driven, which is driven by the variable speed drive motor.
  • the dryer in the process air duct preferably has at least one temperature sensor. It is particularly preferred that the at least one temperature sensor is arranged on the drum inlet or drum outlet.
  • the drive motor additionally drives the cooling air blower.
  • the dryer according to the invention can be designed as a pure dryer, but also as a washer-dryer.
  • a washer-dryer is here understood to mean a combination appliance which has a washing function for washing laundry and a drying function for drying wet laundry.
  • the heater is in particular an electric heater or a gas heater, wherein an electric heater is preferably used.
  • the invention has numerous advantages.
  • the simultaneous realization of a single-motor concept at a reduced speed of the drive motor in the cooling phase a much higher energy savings can be achieved than in known dryers, especially when adapting the speeds of the process air blower to the drying phase using a separate motor to operate the drum.
  • an extension of the drying time can be avoided because the cooling phase can start earlier due to the further drying still taking place during the cooling phase.
  • a reduction in engine speed also means a quieter drying process, which is particularly desirable by the users.
  • the reduced drum speed at the end of the drying process also results in a gentler treatment of the laundry.
  • the figure shows a vertical section through a dryer, which is designed as a condensation dryer, wherein the arrows indicate the flow direction of the process air.
  • the dryer 1 shown has a rotatable about a horizontal axis of the drum 3 for receiving to be dried, not shown here, laundry items, within which are mounted drivers 5 for moving laundry items during a drum rotation.
  • the process air is guided in the process air duct 2 by means of a process air blower 6 through an air-air heat exchanger 14 and an electric heater 4 through the drum 3. In this case, heated by the electric heater 4 heated air through the drum inlet 19 from the rear, i. from the door 12 opposite side of the drum 3, passed through the perforated bottom in the drum 3.
  • the process air laden with moisture flows through the filling opening of the drum 3 through a lint 1 1 inside a door 12 closing the filling opening.
  • the process air flow in the door 12 is then deflected downwards through the drum outlet 18 into the process air duct 2 and directed to the air-to-air heat exchanger 14, can be transported by the cooling air in a cooling air passage 15 by means of a cooling air blower 16.
  • a cooling air blower 16 In the air-air heat exchanger 14 condenses due to cooling a more or less large part of the process air from the laundry absorbed moisture and is collected in a condensate pan 17.
  • the control of the dryer 1 via a program control 8, which can be controlled by the user via an operating unit 7.
  • Two temperature sensors 9, 10, a temperature sensor 9 at the drum outlet 18 and a temperature sensor 10 at the drum inlet 19 are connected to the program control 8.
  • the process air blower 6, the cooling air blower 16 and the drum 3 are driven by the drive motor 13.
  • the drive motor 13 in this embodiment is a brushless synchronous motor (BLDC or PMS motor).
  • BLDC or PMS motor brushless synchronous motor
  • the drum is heavily stocked, for example in the ratio 1: 55, whereas process air and cooling air blower are not stocky, but are driven by the drive motor with a speed ratio of 1: 1.
  • a loading of the drum 3 with items of laundry is first determined, for example, by a conventional method, for example a determination of the weight increase of the drum 3.
  • threshold values of the process air temperature eg T max2 and T max1 , are defined with regard to a relationship between loading and maximum permissible process air temperature stored in the program control 8.
  • the temperature T of the process air is measured when carrying out the method.
  • the heating power of the heater 4 is reduced and the speed of the drive motor 13 is lowered below its average speed ⁇ during the quasi-stationary drying phase.
  • the average speed of the drive motor 13 may be 2750 rpm, which is then lowered to 2200 rpm when the first threshold T max1 is exceeded .
  • Variable speed drive motor in particular BLDC motor heat exchanger; in particular air-air heat exchanger cooling air duct

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

Procédé permettant de faire fonctionner un sèche-linge (1) qui comporte un dispositif de commande (8), un tambour (3) pour le linge à sécher, un canal d'air de traitement (2) dans lequel se trouvent une soufflante (6) pour l'acheminement de l'air de traitement et un dispositif de chauffe (4) pour réchauffer l'air de traitement, et un moteur d'entraînement (13) à régime variable qui entraîne le tambour (3) et la soufflante (6), ledit procédé comportant une phase de chauffe, une phase de séchage à température quasi constante et une phase de refroidissement. Selon l'invention, pendant la phase de séchage à température quasi constante, le moteur d'entraînement (13) à régime variable est entraîné à un régime moyen α1 et la soufflante (6) est entraînée à un régime moyen ω1, et pendant la phase de refroidissement, le moteur d'entraînement (13) est entraîné au moins temporairement à un régime α2 inférieur à α1, et la soufflante (6) est entraînée à un régime ω2 inférieur à ω1. La présente invention concerne en outre un sèche-linge permettant la mise en oeuvre dudit procédé.
PCT/EP2013/059256 2012-05-09 2013-05-03 Procédé permettant de faire fonctionner un sèche-linge à régime variable du moteur d'entraînement et sèche-linge permettant la mise en oeuvre dudit procédé WO2013167488A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207742A DE102012207742A1 (de) 2012-05-09 2012-05-09 Verfahren zum Betrieb eines Trockners mit variabler Drehzahl eines Antriebsmotors sowie hierfür geeigneter Trockner
DE102012207742.1 2012-05-09

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WO2013167488A2 true WO2013167488A2 (fr) 2013-11-14
WO2013167488A3 WO2013167488A3 (fr) 2014-05-08

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US9605375B2 (en) 2014-03-14 2017-03-28 Whirlpool Corporation Method for treating clothes in a dryer

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DE102014219379A1 (de) * 2014-09-25 2016-03-31 BSH Hausgeräte GmbH Verfahren zum Betrieb eines Waschtrockners mit Schutz vor Temperaturschock sowie hierzu geeigneter Waschtrockner
DE102015203663A1 (de) * 2015-03-02 2016-09-08 BSH Hausgeräte GmbH Verfahren zum Betrieb eines Trockners mit einer Wärmepumpe und hierzu geeigneter Trockner

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US6745495B1 (en) 2003-06-27 2004-06-08 General Electric Company Clothes dryer apparatus and method
EP1688532B1 (fr) 2005-01-12 2009-03-18 Whirlpool Corporation Machine à sécher automatique
DE102008019921A1 (de) 2008-04-21 2009-10-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur Trocknung von Wäschestücken und Verfahren zum Betreiben eines derartigen Hausgeräts
DE102009026649A1 (de) 2009-06-02 2010-12-09 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Steuern eines Trocknungsprozesses und Hausgerät zum Trocknen eines feuchten Gutes
EP1775368B1 (fr) 2004-12-01 2011-02-23 Indesit Company S.p.A. Machine a laver séchante avec système pour reguler l'air de séchage.
EP2549009A1 (fr) 2011-07-21 2013-01-23 Whirlpool Corporation Procédé pour la commande d'un sèche-linge et sèche-linge utilisant ledit procédé

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US8104191B2 (en) * 2008-07-31 2012-01-31 Electrolux Home Products, Inc. Laundry dryer providing moisture application during tumbling and reduced airflow
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DE19904993A1 (de) 1999-02-08 2000-08-10 Miele & Cie Kondensationswäschetrockner
US6745495B1 (en) 2003-06-27 2004-06-08 General Electric Company Clothes dryer apparatus and method
EP1775368B1 (fr) 2004-12-01 2011-02-23 Indesit Company S.p.A. Machine a laver séchante avec système pour reguler l'air de séchage.
EP1688532B1 (fr) 2005-01-12 2009-03-18 Whirlpool Corporation Machine à sécher automatique
DE102008019921A1 (de) 2008-04-21 2009-10-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur Trocknung von Wäschestücken und Verfahren zum Betreiben eines derartigen Hausgeräts
DE102009026649A1 (de) 2009-06-02 2010-12-09 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Steuern eines Trocknungsprozesses und Hausgerät zum Trocknen eines feuchten Gutes
EP2549009A1 (fr) 2011-07-21 2013-01-23 Whirlpool Corporation Procédé pour la commande d'un sèche-linge et sèche-linge utilisant ledit procédé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9605375B2 (en) 2014-03-14 2017-03-28 Whirlpool Corporation Method for treating clothes in a dryer

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DE102012207742A1 (de) 2013-11-14
WO2013167488A3 (fr) 2014-05-08

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