EP2467525B1 - Verfahren zum ermitteln einer unwucht bei einer wäschetrommel einer waschmaschine im schleuderbetrieb, antriebsvorrichtung und waschmaschine mit einer antriebsvorrichtung - Google Patents

Verfahren zum ermitteln einer unwucht bei einer wäschetrommel einer waschmaschine im schleuderbetrieb, antriebsvorrichtung und waschmaschine mit einer antriebsvorrichtung Download PDF

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Publication number
EP2467525B1
EP2467525B1 EP10744922.5A EP10744922A EP2467525B1 EP 2467525 B1 EP2467525 B1 EP 2467525B1 EP 10744922 A EP10744922 A EP 10744922A EP 2467525 B1 EP2467525 B1 EP 2467525B1
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EP
European Patent Office
Prior art keywords
imbalance
drive motor
determined
laundry drum
dependence
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EP10744922.5A
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German (de)
English (en)
French (fr)
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EP2467525A1 (de
Inventor
Hasan Gökcer ALBAYRAK
Torsten Böttger
Jörg SKRIPPEK
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Priority to PL10744922T priority Critical patent/PL2467525T3/pl
Publication of EP2467525A1 publication Critical patent/EP2467525A1/de
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    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance

Definitions

  • the invention relates to a method for determining an imbalance in a laundry drum of a washing machine after initiating a spin operation, in which the laundry drum is to accelerate to a predetermined spin speed.
  • the laundry drum is driven by means of a drive motor, and to phase strands of a stator of the drive motor, an alternating electrical voltage is applied in each case, which is provided by an electrical DC link voltage using an inverter.
  • the invention also relates to a drive device for driving a laundry drum of a washing machine and to a washing machine with such a drive device.
  • a method for determining the imbalance in the spin operation of a washing machine is for example from the document DE 102 34 053 C1 known.
  • the power consumption of the drive motor is calculated from measured values for a DC link voltage as well as from measured values for a DC link current.
  • the laundry drum is driven by a drive motor.
  • a drive motor At phase strands of a stator of the drive motor in each case an electrical alternating voltage is applied, which is provided by an electrical DC link voltage using an inverter.
  • an electrical string current is measured, and the unbalance is determined as a function of measured values for the string current.
  • the phase current is measured in at least one phase phase of the drive motor; From the measured values for this string current, the imbalance in the washing drum is then determined. Furthermore, the current is measured directly on the drive motor. Thus, only the electric current actually absorbed by the drive motor is used to determine the imbalance. If the current in the DC link is measured, the losses occurring in the inverter can not be taken into account when determining the imbalance. Also, due to the influence of any, on the side of the electrical supply network - that is before a rectifier - occurring fluctuations in the AC supply voltage to the current of the current in the DC link exact determination of the imbalance based on this current can not be achieved.
  • the current flowing through a phase strand of the stator strand current provides an accurate statement about the actual power consumption and thus on the load or the torque of the drive motor, as well as the unbalance in the laundry drum. Any electrical losses occurring in the inverter, as well as the deviations and fluctuations in the AC supply voltage are not included in the determination of the imbalance; because the unbalance is determined advantageously due to the flowing only in the drive motor strand current.
  • an initial charge of the laundry drum determined prior to the initiation of the centrifugal operation in particular since the beginning of the centrifugal operation, and / or one integrated since the beginning of the washing process, will also be present the drive motor delivered Energy taken into account. Namely, it is inferred in determining the imbalance in particular on the load or the torque of the drive motor. By taking into account the initial load when determining the imbalance, it is thus possible between a torque due to the initial load and the Distinguish torque due to the imbalance.
  • the starting point is a washing program comprising a plurality of process sections, which has at least one washing process and one spinning operation, the washing process serving to clean and / or rinse laundry and smaller by operation at a low speed of the laundry drum, in particular one speed as the usual spin speed, characterized.
  • a speed is less than or equal to the so-called resonance speed of the laundry drum at a low speed, wherein the resonance speed corresponds to the main resonant frequency of a vibrating mounted in the housing of the washing system, which comprises at least the laundry drum.
  • a high speed is a speed that is significantly greater than the resonance speed, preferably in a range of twice to 5 times the resonance speed.
  • the drive motor is a brushless DC motor (BLDC) or a permanent magnet synchronous motor.
  • the drive motor may comprise three phase strings; then the inverter provides three AC voltages, namely one AC voltage for each phase phase of the drive motor.
  • Such synchronous motors are characterized by high efficiencies compared to, for example, asynchronous motors. By a high efficiency of the electric motor can be made compact, so that advantages in terms of cost due to the material savings can be achieved.
  • a major advantage of a brushless DC motor is the ability to measure the string current accurately and without much effort. The current measurement can be done, for example, by a control device that simultaneously controls the inverter.
  • the control device can measure the phase current, and a microprocessor of the control device can evaluate the measured values for the current and determine the imbalance.
  • a microprocessor of the control device can evaluate the measured values for the current and determine the imbalance.
  • phase currents in at least two phase phases, in particular in all phase phases, of the stator are measured and evaluated with regard to the imbalance of the laundry drum.
  • measured values for preferably a total of three phase currents are then available for determining the imbalance.
  • the imbalance can be determined redundantly depending on the respective measured values of the phase currents, and the results of this determination can then be compared with one another.
  • the imbalance depending on summarized measured values of at least two phase currents, in particular of all phase currents are determined. For example, an energy and / or a power can be calculated from the measured values for the phase currents for determining the imbalance, as will be explained in more detail below.
  • a very robust and exact determination of the imbalance can be achieved if, at least at a predetermined time after the initiation of the centrifugal operation, an electrical energy output to the drive motor since a predetermined earlier time, in particular since the start of the centrifugal operation, from the measured values for the phase current is calculated. Then the imbalance can be determined depending on the value of the energy. For the calculation of the energy, the amplitude of the AC voltage applied to the phase string is preferably also used. This embodiment takes advantage of the fact that the electrical energy absorbed by the drive motor depends on the imbalance or the distribution of the laundry items within the laundry drum.
  • the relationship is that the greater the imbalance or the more irregular the distribution of the laundry items on the inner wall of the laundry drum, the greater the load or the torque of the drive motor and thus the energy absorbed by the drive motor. If an initial loading of the laundry drum is known - it can be determined, for example, at the beginning of each washing process - then it can be deduced from the calculated energy on the load of the drive motor due to the uneven distribution of the laundry items in the laundry drum. For calculating the energy, the measured values of the strand flow determined since the start of the spinning operation can be stored, and the energy delivered to the drive motor since the start of the spinning operation can then be calculated from the stored measured values for the strand current.
  • the evaluation of the energy delivered to the drive motor since the start of the spinning operation has the advantage over the evaluation of the measured values of the phase current that any fluctuations occurring in the course of the phase current are taken into account or included in the calculation of the energy.
  • the energy can namely be calculated by integrating the current profile or a power curve.
  • This embodiment is based on the recognition that the slope of the course of the energy represents an exact measure of the imbalance; the greater the imbalance or the load of the drive motor due to unevenly distributed laundry items, the greater the gradient or the gradient of the course of the energy.
  • the evaluation of the slope can be done, for example, that the slope is determined at a certain time after the start of the spinning operation and is compared with stored in a memory reference values for the slope. Depending on this comparison, a degree of imbalance can then be determined.
  • the stored reference values can be subdivided into at least two, in particular at least three, reference value ranges, and it can be checked in which of the reference value ranges the determined slope falls. If each of the reference value ranges is assigned to a specific degree of imbalance - for example "small imbalance", "average imbalance” and "large imbalance” - the degree of imbalance can thus be determined directly without much effort, and the further spinning operation can be carried out accordingly to be controlled.
  • an instantaneous power output to the drive motor can be calculated from the measured values for the phase current and preferably also from the amplitude of the alternating voltage applied to the phase strand. Then the imbalance can be determined depending on the calculated power. The fact that the greater the imbalance of the laundry drum is, the better more power is absorbed by the drive motor.
  • the power can be calculated and compared with reference values stored in a memory.
  • the stored reference values can be subdivided into at least two, in particular at least three, reference value ranges, and it can be checked in which of the reference value ranges the calculated power value falls.
  • each of the reference value ranges is assigned to a specific degree of imbalance - for example, "small imbalance”, “average imbalance” and “large imbalance” - the degree of imbalance can thus be determined directly without much effort, and the further spinning operation can be carried out accordingly to be controlled.
  • a progression of the electrical power delivered to the drive motor in the spin mode can be determined over time, and the unbalance can be determined as a function of a gradient or a gradient of this profile.
  • the slope of the course of the power can also be compared with reference values stored in a memory, and the unbalance can be determined depending on the result of this comparison.
  • the course of the power can also be evaluated for the duration of one revolution of the laundry drum, and depending on this course, the position of the imbalance in the laundry drum can be determined or an uneven distribution of the laundry within the laundry drum can be detected. It takes advantage of the fact that the imbalance of the laundry drum can be detected by means of a fluctuation in the course of the power for the duration of one drum revolution. The variation of this course then represents a direct measure of the distribution of imbalance in the laundry drum.
  • the profile of the phase current can be evaluated over time, and the unbalance can be determined depending on the course of the string current.
  • a shape of an envelope of the Phase current can be evaluated. If there are high fluctuations in the course of the phase current or in the course of the envelope, this is a sign that there is an uneven distribution of the laundry items within the laundry drum.
  • the course of the string current can also be evaluated for the duration of one revolution of the laundry drum, and depending on this course, the position of the imbalance in the laundry drum can be determined or an uneven distribution of the laundry items within the laundry drum can be detected.
  • the imbalance of the laundry drum can therefore be detected by means of a fluctuation in the course of the strand current for the duration of a drum revolution.
  • the variation of this course then represents a direct measure of the distribution of imbalance in the laundry drum.
  • reference values can be stored in a memory and the imbalance can be determined as a function of a comparison of the determined and / or calculated variable with the stored reference values.
  • the measured values for the phase current and / or the energy values and / or the slope of the curve of the energy and / or the power values and / or the slope of the curve of the power can be compared with respectively assigned reference values stored in a memory.
  • a degree of imbalance can then be determined.
  • the stored reference values can be subdivided into at least two, in particular at least three, reference value ranges, and it can be checked in which of the reference value ranges the measured and / or calculated quantity falls.
  • each of the reference value ranges is assigned to a specific degree of imbalance - for example, "small imbalance”, “average imbalance” and “large imbalance” - the degree of imbalance can thus be determined directly without much effort, and the further spinning operation can be carried out accordingly to be controlled.
  • the further spin operation can be controlled depending on a degree of the detected unbalance. If the imbalance in the laundry drum is large, the laundry drum can not be accelerated to the predetermined spin speed, as this could lead to an uncontrolled vibration of the washing machine. This is especially true for high spin speeds of the laundry drum greater than 800 U / min. For this reason, in particular safety measures are taken by which uncontrolled vibrations of the washing machine can be avoided. It can for Example, the predetermined spin speed to which the laundry drum is to accelerate, then reduced when the determined imbalance reaches a predetermined first degree - for example, "medium imbalance".
  • the determined imbalance is not yet critical - but large enough to put the washing machine into undesired vibration at the given spin speed of the laundry drum - so the laundry drum can be accelerated to a lower speed.
  • the desired goal of being able to carry out the centrifugal operation can therefore be achieved with a reduced speed in this embodiment.
  • a microprocessor of the washing machine initiates a spin operation of a washing process.
  • the laundry drum should be accelerated to a spin speed of 1200 rpm.
  • the microprocessor controls an inverter, which in each case provides an electrical AC voltage to each phase strand of a permanent magnet synchronous motor, namely from a DC link voltage.
  • the washing drum is driven by the permanent magnet synchronous motor.
  • the microprocessor begins to calculate the electrical energy delivered to the permanent magnet synchronous motor. For example, the microprocessor calculates the energy at regular intervals, for example at intervals of about 10 ms.
  • the microprocessor takes into account the energy delivered to the motor since the start of the spinning operation, that is, the energy is integrated in each case. This results in a time course of the energy delivered to the engine in each case since the initiation of the spinning operation. After a predetermined period of time has elapsed after initiation of the spinning operation, the microprocessor determines an increase in the time profile of the energy and / or the absolute value of the energy delivered since the start of the spinning operation at this time. This slope and / or the absolute value of the energy is compared by the microcontroller with reference values for the slope or energy stored in a memory. The microcontroller checks in which reference value range the determined slope and / or the absolute value of the energy falls / falls.
  • the microcontroller also takes into account a start load, which was determined at the beginning of the washing process. Thus, the microcontroller can judge what imbalance in the laundry drum or which load of the drive motor is given. Recognize the Microprocessor "average imbalance", the spin speed of 1200 rev / min is reduced to, for example, 800 rpm.
  • the laundry drum can be completely decelerated. Then the spin operation is interrupted for a short time, and the laundry drum is braked to 0 rev / min and accelerated again. The laundry items are thus redistributed in the laundry drum, and the imbalance is determined after re-accelerating the laundry drum again.
  • This embodiment has the advantage that the washing machine is not put into an uncontrolled oscillatory movement, dangerous conditions of the washing machine are avoided.
  • the drive device also includes an inverter coupled to phase strings of a stator of the drive motor, to the input of which a DC link voltage can be applied and which is designed to provide in each case an electrical AC voltage for the phase phases of the stator.
  • a controller controls the inverter.
  • the control device is designed to measure an electrical string current in at least one phase strand of the stator, even before the initiation of the centrifugal operation, an initial loading of the laundry drum and / or an integrated, in particular since the beginning, of the previous spin mode preceded washing process, to the drive motor To determine energy and to determine an imbalance in the laundry drum depending on measured values for the strand flow and depending on the initial load and / or the integrated during the washing process energy.
  • a washing machine according to the invention comprises a drive device according to the invention or a preferred embodiment thereof.
  • FIG. 1 1 shows a drive device 2 which serves for mechanically driving a laundry drum 3 arranged in the washing machine 1.
  • the laundry drum 3 is designed to receive laundry items 4.
  • the drive device 2 comprises a drive motor 5 and a circuit arrangement 6 for operating the drive motor 5.
  • the drive motor 5 is in the embodiment a permanent magnet synchronous motor or a brushless DC motor and comprises three phase strands 7, 8, 9.
  • the phase strand 7 is connected to a first terminal 10 of Drive motor 5 electrically connected; the phase strand 8 is connected to a second terminal 11 of the drive motor 5, and the phase strand 9 is connected to a third electrical terminal 12 of the drive motor 5.
  • the circuit arrangement 6 comprises a circuit input 13 with a first and a second input connection 14, 15, between which an electrical supply alternating voltage U v is applied.
  • the AC supply voltage U v is provided by an electrical supply network.
  • the circuit arrangement 6 also has three output terminals 16, 17, 18.
  • the first output terminal 16 is connected to the first terminal 10 of the drive motor 5
  • the second output terminal 17 is connected to the second terminal 11 of the drive motor 5
  • the third output terminal 18 is connected to the third terminal 12 of the drive motor 5.
  • Fig. 1 With the input terminals 14, 15 is a in Fig. 1 only schematically illustrated power supply 19 coupled, the - as out Fig. 1 shows - may have a bridge rectifier.
  • the power supply 19 may also comprise other components, such as in particular a line filter and the like.
  • the power supply 19 provides between its output terminals 20, 21 an electrical DC link voltage U z .
  • a reference potential B is provided at the output terminal 21.
  • an intermediate circuit capacitor 22 is connected between the output terminals 20, 21 of the power supply 19, that is parallel to the power supply 19, an intermediate circuit capacitor 22 is connected.
  • the DC link voltage U z provided by the power supply unit 19 is applied to the DC link capacitor 22.
  • a voltage divider 23 Parallel to the DC link capacitor 22, a voltage divider 23 is connected, which has two ohmic resistors 24 in the embodiment. Between the ohmic resistors 24 a Abgriffpol 25 is arranged, at which a voltage U s can be tapped. The amplitude of the voltage U s provided by the voltage divider 23 represents a measure of the amplitude of the DC link voltage U z .
  • the inverter 26 includes a first circuit branch 27, a second circuit branch 28, and a third circuit branch 29.
  • the first, second, and third circuit branches 27, 28, 29 are coupled on the one hand to the output terminal 20 of the power supply 19 and on the other hand to the reference potential B or the output terminal 21 of the power supply 19.
  • the first circuit branch 27 comprises two electrical switches 30, 31; a pole 32 arranged between the electrical switches 30, 31 is coupled to the first output terminal 16 of the circuit arrangement 6.
  • the second circuit branch 28 has correspondingly two electrical switches 33, 34; a pole 35 arranged between the electrical switches 33, 34 is coupled to the second output terminal 17 of the circuit arrangement 6.
  • the third circuit branch 29 has two electrical switches 36, 37; a pole 38 provided between the electrical switches 36, 37 is coupled to the third output terminal 18 of the circuit arrangement 6 and thus to the third terminal 12 of the drive motor 5.
  • the electrical switches 30, 31, 33, 34, 36, 37 in the exemplary embodiment bipolar transistors with insulated gate electrodes (IGBT).
  • the circuit arrangement 6 furthermore comprises a control device 39, which in the exemplary embodiment is a microprocessor.
  • the control device 39 serves to drive the inverter 26, and more precisely the electrical switch 30, 31, 33, 34, 36, 37.
  • control device 39 By appropriate control of the inverter 26, the control device 39, the speed of the drive motor 5 and thus control the speed of the laundry drum 3 and / or regulate.
  • the control device 39 can also measure the intermediate circuit DC voltage U z , namely, depending on the electrical voltage U s provided by the voltage divider 23.
  • the control device is coupled to the tapping pole 25 of the voltage divider 23.
  • the control device 39 detects the voltage U s and can thus infer the DC link voltage U z .
  • the control device 39 also detects phase currents I 1 , I 2 , I 3 , which flow via the phase strands 7, 8, 9 of the drive motor 5.
  • the control device 39 is coupled to a tapping pole 41 of the first circuit branch 27 arranged between the electrical switch 31 and an ohmic resistor 40 connected in series therewith.
  • the control device 39 is also coupled to a tapping pole 42, which is arranged between the electrical switch 34 and a series-connected ohmic resistor 43 in the second circuit branch 28.
  • the control device 39 is coupled to a tapping pole 44, which is arranged between the electrical switch 37 and a series-connected ohmic resistor 45 in the third circuit branch 29.
  • the control device 39 can detect the respective current intensity of the phase currents I 1 , I 2 , I 3 , which flow via the phase strands 7, 8, 9 of the drive motor 5.
  • the method is used to determine an imbalance in the laundry drum 3, which may occur due to uneven distribution of the laundry items 4 on an inner wall of the laundry drum 3 in a centrifugal operation.
  • the drum 3 In the spin mode, the drum 3 is to be accelerated to a predetermined spin speed - for example to a speed of 1200 rpm - to dewater the laundry items 4.
  • the initial loading of the laundry drum 3, that is to say the initial mass of the laundry items 4 is determined by the control device 39.
  • the load or the torque of the drive motor 5 and thus the imbalance in the laundry drum 3 are then determined as a function of the measured values for the phase currents I 1 , I 2 , I 3 and depending on the determined initial load of the laundry drum 3.
  • the control device 39 collects all measured values for the phase currents I 1 , I 2 , I 3 after the initiation of the centrifugal operation. From these measured values for the phase currents I 1 , I 2 , I 3 , as well as from the amplitude of the voltages U 12 , U 23 , U 13 , the control device 39 calculates an electrical energy E delivered to the drive motor 5. This energy E can be used by the control device 39 also in the washing mode, so before the initiation of the spin operation calculate. For the determination of the imbalance in the laundry drum 3, however, the control device 39 preferably takes into account only the after measured values for the phase currents I 1 , I 2 , I 3 recorded in the initiation of the spinning operation.
  • the spinning operation starts at a time t 0 .
  • the energy E delivered to the drive motor 5 in the spinning mode is still 0 Wh; the drive motor 5 has not taken up any energy E in the spin mode.
  • the control device 39 continuously calculates, for example, at intervals of 10 ms, the energy E delivered to the drive motor 5 since the start of the spinning operation, that is to say since the time t 0.
  • the course of the energy E increases over time t during the spin operation.
  • the energy E is integrated in the spinning mode, so that at the end of the spinning operation the total energy E recorded in the spinning operation by the drive motor 5 is calculated.
  • the control device 39 determines a time course of the energy E during the spin operation. Depending on the course of the energy E, the control device 39 then determines the imbalance in the laundry drum 3; At the same time, the control device 39 evaluates a gradient ⁇ E / ⁇ t of the course of the energy E. In Fig. 2 For example, different slopes .DELTA.E / .DELTA.t the curves of the energy E are shown. A slope ⁇ E / ⁇ t of a first course V 1 corresponds to a large degree of imbalance; the energy E increases relatively quickly or the drive motor 5 has absorbed a relatively large amount of energy E since the start of the spinning operation.
  • the slope .DELTA.E / .DELTA.t of a relatively flat waveform V 2 of the energy E corresponds to a small degree of imbalance; the drive motor 5 has absorbed comparatively little energy E since the time t 0 or the energy increases relatively slowly.
  • the determination of the unbalance can be made such that the laundry drum 3 is first accelerated to a lower speed of, for example, 100 rpm to 300 rpm before it is accelerated to the spin speed.
  • the control device 39 can then evaluate the energy E, namely in particular the slope ⁇ E / ⁇ t of the course of the energy E.
  • the control device 39 compares the determined slope .DELTA.E / .DELTA.t with stored in a memory reference values for the slope .DELTA.E / .DELTA.t. For example, different reference value ranges can be stored in the memory, the control device 39 then checks in which of the reference value ranges the determined slope ⁇ E / ⁇ t falls.
  • Each reference value range can be assigned one degree of imbalance, namely, for example, "low imbalance", "average imbalance” and "large imbalance”.
  • the control device 39 can also evaluate the absolute values of the energy E (measured in watt-hours) and determine the unbalance depending on this.
  • Fig. 3 is a section of the curves of the energy E over the time t shown.
  • the memory reference ranges R1, R2, R3 may be stored, which are each assigned to a different degree of imbalance.
  • the reference value range R1 can be assigned to a "small imbalance", the reference value range R2 to a "middle imbalance", and the reference value range R3 to a "large imbalance”.
  • the control device 39 evaluates the absolute value of the energy E.
  • the control device 39 checks in which of the value ranges R1, R2, R3 the calculated value of the energy E falls. Thus, the control device 39 can directly infer the degree of imbalance.
  • the control device 39 may first accelerate the laundry drum 3 to a first rotational speed of, for example, 100 rpm. At this speed, the control device 39 can calculate the energy E delivered to the drive motor 5 since the start of the spinning operation. The control device 39 can then check in which of the reference value ranges R1, R2, R3 the calculated value of the energy E falls. However, the determination of the unbalance can also be such that the control device 39 initially accelerates the drum 3 to a predetermined speed of, for example, 100 rpm and from this speed begins to calculate the energy E.
  • the control device 39 can then accelerate the laundry drum 3 to a predetermined higher speed of, for example, 200 rpm and calculate the energy E delivered to the drive motor 5 during this acceleration.
  • the energy E can be calculated and used to determine the unbalance, which is delivered to the drive motor 5 during a time interval during which the laundry drum 3 is accelerated from a first predetermined speed to a second predetermined speed.
  • the control device 39 can check in which reference value range R1, R2, R3 the calculated value of the energy E falls.
  • control device 39 can also evaluate the measured values for the phase currents I 1 , I 2 , I 3 and determine the imbalance in the laundry drum 3 as a function of this evaluation. For example, temporal courses of the phase currents I 1 , I 2 , I 3 can be analyzed, in particular an envelope of these courses can be evaluated. The imbalance can then be determined as a function of fluctuations in these courses. It can also be provided here that the course of at least one of the phase currents I 1 , I 2 , I 3 analyzed for the duration of a drum revolution and the imbalance is determined depending on this course within a drum revolution.
  • the control device 39 can calculate and evaluate an electric power delivered to the drive motor 5 in the spin mode, namely from the measured values for the phase currents I 1 , I 2 , I 3 .
  • a slope of a time history of the power may be calculated and compared with reference values stored in the memory. Depending on this comparison, in particular depending on in which reference value range the determined slope falls, then the imbalance can be determined.
  • the course of the electrical power can also be analyzed for the duration of a drum revolution, and the unbalance can then be determined as a function of fluctuations in this course within one drum revolution.
  • a method is provided with which the imbalance in a laundry drum 3 a washing machine 1 or the mechanical load of the laundry drum 3 driving drive motor 5 can be determined in the spin mode.
  • Phase currents I 1 , I 2 , I 3 of the drive motor 5 are measured, and the imbalance is determined as a function of the measured values for the phase currents I 1 , I 2 , I 3 .
  • an electric energy E outputted to the drive motor 5 since a predetermined time after initiating the spin operation, particularly since the start of the spin operation, may be calculated, and the unbalance may be determined depending on the calculated value of the energy E.
  • a slope ⁇ E / ⁇ t of a time profile of the energy E can be used as a measure of the imbalance or for a torque of the drive motor 5. In this way, it is possible to accurately determine the imbalance in the washing drum 3, and appropriate safety measures in the spin mode can be taken. For example, the originally determined spin speed to which the laundry drum 3 is to be accelerated in the spin mode can be reduced or it can be interrupted the spin operation and the laundry items 4 can be redistributed in the laundry drum 3.
  • the imbalance can also be determined sequentially or continuously during the further course of the shearing operation in one of the above-mentioned manner.
  • the imbalance can also be determined sequentially or continuously during the further course of the shearing operation in one of the above-mentioned manner.
  • a previously determined depending on the determined imbalance spin speed can be reduced when the imbalance has become greater, or the fixed spin speed are increased when the imbalance has decreased.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP10744922.5A 2009-08-21 2010-08-17 Verfahren zum ermitteln einer unwucht bei einer wäschetrommel einer waschmaschine im schleuderbetrieb, antriebsvorrichtung und waschmaschine mit einer antriebsvorrichtung Active EP2467525B1 (de)

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Application Number Priority Date Filing Date Title
PL10744922T PL2467525T3 (pl) 2009-08-21 2010-08-17 Sposób ustalenia niewyważenia w bębnie pralki w trybie wirowania, urządzenie napędowe i pralka z takim urządzeniem napędowym

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Application Number Priority Date Filing Date Title
DE102009028810A DE102009028810A1 (de) 2009-08-21 2009-08-21 Verfahren zum Ermitteln einer Unwucht bei einer Wäschetrommel einer Waschmaschine im Schleuderbetrieb, Antriebsvorrichtung und Waschmaschine mit einer Antriebsvorrichtung
PCT/EP2010/061919 WO2011020820A1 (de) 2009-08-21 2010-08-17 Verfahren zum ermitteln einer unwucht bei einer wäschetrommel einer waschmaschine im schleuderbetrieb, antriebsvorrichtung und waschmaschine mit einer antriebsvorrichtung

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EP2467525A1 EP2467525A1 (de) 2012-06-27
EP2467525B1 true EP2467525B1 (de) 2013-07-10

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EP (1) EP2467525B1 (zh)
CN (1) CN102482825B (zh)
DE (1) DE102009028810A1 (zh)
EA (1) EA022451B1 (zh)
PL (1) PL2467525T3 (zh)
WO (1) WO2011020820A1 (zh)

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EA201270299A1 (ru) 2012-09-28
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DE102009028810A1 (de) 2011-02-24
CN102482825B (zh) 2014-09-10
PL2467525T3 (pl) 2013-12-31
CN102482825A (zh) 2012-05-30
WO2011020820A1 (de) 2011-02-24

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