EP0878575B1 - Method for balancing a rotating body - Google Patents
Method for balancing a rotating body Download PDFInfo
- Publication number
- EP0878575B1 EP0878575B1 EP98107766A EP98107766A EP0878575B1 EP 0878575 B1 EP0878575 B1 EP 0878575B1 EP 98107766 A EP98107766 A EP 98107766A EP 98107766 A EP98107766 A EP 98107766A EP 0878575 B1 EP0878575 B1 EP 0878575B1
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- EP
- European Patent Office
- Prior art keywords
- speed
- imbalance
- temperature
- weights
- balancing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims description 16
- 238000005406 washing Methods 0.000 claims description 14
- 238000013016 damping Methods 0.000 claims description 12
- 230000001419 dependent effect Effects 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 3
- 230000001447 compensatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Images
Classifications
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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
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
- D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
-
- 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
- D06F33/48—Preventing or reducing imbalance or noise
-
- 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
- D06F2103/26—Imbalance; Noise level
-
- 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 balancing rotating bodies using a device consisting of at least one concentrically rotating body to its axis of rotation arranged annular raceway, within the at least two weights are freely movable.
- Such a device is known for example from FR 1 213 067. She uses it freely Weights that can be moved within the raceway to compensate for an imbalance.
- the balancing primarily refers to an unbalance caused by an uneven distributed laundry mass is caused in a laundry drum.
- EP 0 349 798 B1 describes a method for controlling the spinning process in washing machines known in which the drum from a fixed, previously determined position of the Unbalance is accelerated out. This procedure is designed to reduce unbalance Deflections of the vibrating system of the washing machine, but not to Remove or reduce the imbalance.
- the invention therefore has the problem of a method and a device for balancing of rotating bodies of the type mentioned above, which (s) in subcritical range does not lead to an increase in the unbalance.
- the advantages achievable with the invention result from the fact that the acceleration of the Body takes place from a defined position, in which the weights are out of balance first fully or partially compensate. In this way, statistically, less Vibration amplitudes of the body to be balanced than with a random initial distribution the weights are expected.
- the speed is before reaching the critical speed advantageously increased suddenly or at least very quickly prevent the weights from being aligned in a position that increases the unbalance.
- a means to increase the running friction of the weights in arranged a means to increase the running friction of the weights.
- the Balls rotate with the raceway and not due to their gravity in the lower area of the Roll off the web.
- a viscous damping agent, especially oil has proven itself here, as liquids with low viscosity do not produce the desired effect and highly viscous masses or sand disturb the orientation of the balls in the supercritical area.
- damping agents unfortunately lead to considerable problems in their disposal.
- their viscosity strongly temperature-dependent, so that their use in rotating bodies with fluctuating Temperature, for example in washing machine drums in suds containers with different tempered lye, difficult.
- a temperature detection device the ambient temperature of the track detected and if a control device Bodies from a dependent on the ambient temperature and the position of the unbalance Position accelerated to the second speed.
- the temperature influences of the Damping device on the position of the balls before accelerating to the supercritical Speed can be reduced.
- FIG. 1 is a drum washing machine (1) with a swinging suspended Indoor unit shown schematically.
- a washing drum is in a tub (2) (3) rotatably mounted and is driven by an electric motor (4).
- the Regulation (6) of the motor (4) and a device (7) for detecting the unbalance (15) of the Drum (3) are integrated in a microprocessor control (5).
- a microprocessor control (5) As an indication of a possibly This unbalance (15) can cause the fluctuations in the speed, the motor current consumption and / or the torque can be evaluated.
- it creates with tachogenerator (8) connected to the motor shaft one of the respective rotational speeds of the laundry drum (3) corresponding voltage.
- the actual voltage generated by the tachometer generator (8) with a target voltage corresponding to the desired speed (reference voltage) compared.
- the motor control variable is influenced.
- Balancing systems are used in the drum cap (9) and the drum base (10) (see FIG. 2), an inexpensive method of producing the annular raceways (12) Thermoforming process is used.
- Figure 3 shows a longitudinal section through a raceway (12), with individual balls (13) as weights are recognizable. These can have a circular cross-section (12) move freely meridional. To ensure the maximum compensation, each track (12) in the densest packing in an angular range ⁇ ⁇ 180 ° with balls (13) be filled. So with the horizontal axis of rotation the gravity acting on the ball (13) is overcome from a desired rotational speed and the balls (13) of the career, it must be with a viscous damping agent (14) be filled, advantageously using oil. Without this damping agent (14) the balls (13) would only be subject to rolling friction and thus at the lowest point of the Roll career (12) without developing their compensatory effect.
- the laundry drum (3) runs through a laundry distribution speed range t V when accelerating from a washing speed n W.
- this distribution speed range t V the laundry is well distributed around the drum circumference; so that better dewatering of the laundry and the least possible imbalance (15) is achieved.
- a laundry application speed range t A with a constant application speed n A can be traversed following the laundry distribution speed range t V.
- any imbalance (15) that may be present is sensed by the microprocessor control (5) of the drum washing machine (1).
- the size and the position of the unbalance (15) are sensed by evaluating the fluctuations in the speed, the motor current or the torque in relation to the motor control.
- the size of the change in speed is a measure of the size of the unbalance (15).
- the speed, the Mortor current consumption and the torque provide information about the position of the unbalance (15) in the drum (3).
- the microprocessor control (5) therefore first senses the position of the unbalance (15) and starts the centrifugal run-up according to the invention exactly when unbalance (15) and Oppose the center of gravity of the ball diametrically. It should be noted that the microprocessor control (5) the location of the center of gravity (S) must be known. A sensation with the help of position sensors is used when using several individual balls (13) reasonable effort not possible. Therefore, the rolling behavior of the balls (13) must be in Test series observed and the friction-dependent position of the center of gravity (S) in be stored in a memory of the microprocessor control.
- the decisive factor here is The fact that the viscous damping with a drum washing machine (1) different lye temperature relevant temperature range between 20 ° C and 70 ° C Varies at least by a factor of 2, since no more viscosity-stable liquids are known.
- the phase angle of the unbalance position during spin-up must therefore depend on the temperature ( ⁇ ) can be varied, since the drain position of the Balls (13) changes in the subcritical speed range. Acceleration must also be accelerated be modified because the time to distribute the balls (13) depending on Viscosity of the damping agent (14) changes and only then an amplitude reduction in Resonance passage is guaranteed.
- the temperature ( ⁇ ) of the damping agent is with the The alkali temperature is identical and can therefore be measured using an existing temperature sensor (18) be detected on the tub (2).
- FIG. 8 shows another embodiment in which, instead of individual balls (13), ball trains (16) be used.
- Bimetal plate (17) At the ends of each ball train (16) there is one Bimetal plate (17), which, depending on the temperature, the gap width to the edges of the track (12) varies and thus keeps the viscous damping of the ball trains (16) constant.
- this Trap will be the adaptation of the acceleration, as well as the temperature-dependent change dispensing with the phase spin angle.
- Another advantage of the ball trains (16) is in that the sliding friction with each other and the collision of the balls (13) is prevented, which has a positive effect on the noise situation.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Testing Of Balance (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Auswuchten von rotierenden Körpern unter Verwendung einer Vorrichtung, bestehend aus mindestens einer mit dem Körper umlaufenden, konzentrisch zu seiner Rotationsachse angeordneten kreisringförmigen Laufbahn, innerhalb der mindestens zwei Gewichte frei beweglich angeordnet sind.The invention relates to a method for balancing rotating bodies using a device consisting of at least one concentrically rotating body to its axis of rotation arranged annular raceway, within the at least two weights are freely movable.
Eine derartige Vorrichtung ist beispielsweise aus der FR 1 213 067 bekannt. Sie nutzt die frei
beweglich innerhalb der Laufbahn angeordneten Gewichte zum Ausgleichen einer Unwucht.
Dabei bezieht sich das Ausgleichen in erster Linie auf eine Unwucht, die durch eine ungleichmäßig
verteilte Wäschemasse in einer Wäschetrommel hervorgerufen wird.Such a device is known for example from
Der Nachteil einer solchen Vorrichtung besteht darin, daß sich die kompensatorische Wirkung erst oberhalb der Resonanzfrequenz bzw. kritischen Drehzahl des Systems entfaltet, in dem der rotierende Körper gelagert ist (s. bspw. Kellenberger: Elastisches Wuchten; Springer Verlag; S. 402f). Im unterkritischen Drehzahlbereich wird die vorhandene Unwucht sogar verstärkt. Deshalb liegt das Hauptanwendungsgebiet einer solchen Vorrichtung bei schnell rotierenden Maschinen mit einer konstanten Drehzahl oberhalb aller auftretenden Resonanzfrequenzen. Es besteht jedoch der Wunsch, eine solche Vorrichtung beispielsweise auch beim Schleuderhochlauf eines Waschautomaten mit horizontaler Rotationsachse zu nutzen. Dabei sollen sowohl die Amplituden im eingeschwungenen überkritischen Zustand als auch beim Durchfahren durch die Resonanzen reduziert werden.The disadvantage of such a device is that the compensatory effect only unfolded above the resonance frequency or critical speed of the system in which the rotating body is supported (see e.g. Kellenberger: elastic balancing; springer Publishing company; P. 402f). In the subcritical speed range, the existing unbalance is even strengthened. Therefore, the main field of application of such a device is fast rotating machines with a constant speed above all occurring resonance frequencies. However, there is a desire to use such a device, for example in Spin start-up of a washing machine with a horizontal axis of rotation. there should both the amplitudes in the steady supercritical state and in Driving through the resonances can be reduced.
Aus der EP 0 349 798 B1 ist ein Verfahren zur Steuerung des Schleudervorgangs bei Waschmaschinen bekannt, bei dem die Trommel aus einer festen, zuvor ermittelten Position der Unwucht heraus beschleunigt wird. Dieses Verfahren soll zur Verringerung von unwuchtbedingten Auslenkungen des schwingenden Systems der Waschmaschine, jedoch nicht zur Beseitigung bzw. Verminderung der Unwucht führen.EP 0 349 798 B1 describes a method for controlling the spinning process in washing machines known in which the drum from a fixed, previously determined position of the Unbalance is accelerated out. This procedure is designed to reduce unbalance Deflections of the vibrating system of the washing machine, but not to Remove or reduce the imbalance.
Der Erfindung stellt sich somit das Problem, ein Verfahren bzw. eine Vorrichtung zum Auswuchten von rotierenden Körpern der eingangs genannten Art zu offenbaren, welche(s) im unterkritischen Bereich nicht zu einer Verstärkung der Unwucht führt.The invention therefore has the problem of a method and a device for balancing of rotating bodies of the type mentioned above, which (s) in subcritical range does not lead to an increase in the unbalance.
Erfindungsgemäß wird dieses Problem durch ein Verfahren mit den im Patentanspruch 1
angegebenen Merkmalen gelöst. Vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens
und vorteilhafte Ausgestaltungen einer Vorrichtung zur Durchführung dieses Verfahrens
ergeben sich aus den nachfolgenden Unteransprüchen. According to the invention, this problem is solved by a method with that in
Die mit der Erfindung erreichbaren Vorteile resultieren daraus, daß die Beschleunigung des Körpers aus einer definierten Position heraus erfolgt, in der die Gewichte die Unwucht zunächst ganz oder teilweise kompensieren. Auf diese Weise können statistisch gesehen geringere Schwingungsamplituden des auszuwuchtenden Körpers als bei einer zufälligen Anfangsverteilung der Gewichte erwartet werden. Dabei wird die Drehzahl vor dem Erreichen der kritischen Drehzahl vorteilhafterweise sprunghaft oder zumindestens sehr schnell erhöht, um das Ausrichten der Gewichte in eine die Unwucht verstärkende Position zu verhindern.The advantages achievable with the invention result from the fact that the acceleration of the Body takes place from a defined position, in which the weights are out of balance first fully or partially compensate. In this way, statistically, less Vibration amplitudes of the body to be balanced than with a random initial distribution the weights are expected. The speed is before reaching the critical speed advantageously increased suddenly or at least very quickly prevent the weights from being aligned in a position that increases the unbalance.
Bei Waschmaschinen ist es vorteilhaft, die Position der Unwucht während des Schleuderhochlaufs im Verteil- oder Anlegedrehzahlbereich festzustellen. Hier hat die Wäsche bereits eine feste Position eingenommen, d. h., die evtl. durch ungünstige Wäscheverteilung entstandene Unwucht ist stationär.In washing machines, it is advantageous to determine the position of the unbalance during the spin-up determined in the distribution or application speed range. Here's the laundry already held a fixed position, d. that is, the possibly caused by unfavorable laundry distribution Imbalance is stationary.
Bei einer vorteilhaften Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist in der Laufbahn ein Mittel zur Erhöhung der Laufreibung der Gewichte angeordnet. Bei einer horizontalen Rotationsachse des Körpers wird durch ein solches Mittel sichergestellt, daß die Kugeln mit der Laufbahn rotieren und nicht aufgrund ihrer Schwerkraft im unteren Bereich der Bahn abrollen. Hier bewährt sich ein viskoses Dämpfungsmittel, insbesondere Öl, da Flüssigkeiten mit geringer Viskosität den gewünschten Effekt nicht erbringen und hochviskose Massen oder Sand die Ausrichtung der Kugeln im überkritischen Bereich stören. Solche Dämpfungsmittel führen bei ihrer Entsorgung leider zu erheblichen Problemen. Außerdem ist ihre Viskosität stark temperaturabhängig, so daß ihr Einsatz bei rotierenden Körpern mit schwankender Temperatur, beispielsweise bei Waschmaschinentrommeln in Laugenbehältern mit unterschiedlich temperierter Lauge, Schwierigkeiten bereitet.In an advantageous device for performing the method according to the invention, in arranged a means to increase the running friction of the weights. At a horizontal axis of rotation of the body is ensured by such a means that the Balls rotate with the raceway and not due to their gravity in the lower area of the Roll off the web. A viscous damping agent, especially oil, has proven itself here, as liquids with low viscosity do not produce the desired effect and highly viscous masses or sand disturb the orientation of the balls in the supercritical area. Such damping agents unfortunately lead to considerable problems in their disposal. In addition, their viscosity strongly temperature-dependent, so that their use in rotating bodies with fluctuating Temperature, for example in washing machine drums in suds containers with different tempered lye, difficult.
Bei einem solchen Anwendungsfall ist es vorteilhaft, wenn eine Temperaturerfassungseinrichtung die Umgebungstemperatur der Laufbahn erfaßt und wenn eine Steuereinrichtung den Körper aus einer von der Umgebungstemperatur und der Position der Unwucht abhängigen Stellung auf die zweite Drehzahl beschleunigt. Hierdurch können die Temperatureinflüsse des Dämpfungsmittels auf die Position der Kugeln vor dem Beschleunigen auf die überkritische Drehzahl verringert werden.In such an application, it is advantageous if a temperature detection device the ambient temperature of the track detected and if a control device Bodies from a dependent on the ambient temperature and the position of the unbalance Position accelerated to the second speed. As a result, the temperature influences of the Damping device on the position of the balls before accelerating to the supercritical Speed can be reduced.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigen
Figur 1- eine Trommelwaschmaschine (1) und schematisch die Einrichtung zur Unwuchtsensierung
Figur 2- eine schematische Darstellung einer Waschmaschinentrommel (3) mit zwei Auswuchtsystemen (11)
Figur 3- einen Längsschnitt durch eine Laufbahn,
Figur 4- ein Drehzahl-Zeit-Diagramm
- Figur 5-7
- das drehzahlabhängige Verhalten des Auswuchtsystems anhand von Längsschnitten durch eine Laufbahn
Figur 8- einen Längsschnitt durch ein Auswuchtsystem mit Kugelzügen
- Figure 1
- a drum washing machine (1) and schematically the device for unbalance sensing
- Figure 2
- a schematic representation of a washing machine drum (3) with two balancing systems (11)
- Figure 3
- a longitudinal section through a career,
- Figure 4
- a speed-time diagram
- Figure 5-7
- the speed-dependent behavior of the balancing system based on longitudinal cuts through a raceway
- Figure 8
- a longitudinal section through a balancing system with ball trains
In der Figur 1 ist eine Trommelwaschmaschine (1) mit einem schwingfähig aufgehängten Innenaggregat schematisch dargestellt. In einem Laugenbehälter (2) ist eine Wäschetrommel (3) drehbar gelagert und wird von einem Elektromotor (4) angetrieben. Die Regelung (6) des Motors (4) und eine Einrichtung (7) zur Erfassung der Unwucht (15) der Trommel (3) sind in einer Mikroprozessor-Steuerung (5) integriert. Als Indiz für eine eventuell vorliegende Unwucht (15) können die Schwankungen der Drehzahl, der Motorstromaufnahme und/oder des Drehmoments ausgewertet werden. In dem vorliegenden Beispiel erzeugt der mit der Motorwelle verbundene Tachogenerator (8) eine der jeweiligen Drehzahl der Wäschetrommel (3) entsprechende Spannung. Um eine Steuergröße für die Mortorstromregelung (6) zu erhalten, wird z.B. in bekannter Weise die vom Tachogenerator (8) erzeugte Ist-Spannung mit einer der gewünschten Drehzahl entsprechenden Soll-Spannung (Bezugsspannung) verglichen. Je nach Regelabweichung erfolgt eine Beeinflussung der Motorstellgröße.In Figure 1 is a drum washing machine (1) with a swinging suspended Indoor unit shown schematically. A washing drum is in a tub (2) (3) rotatably mounted and is driven by an electric motor (4). The Regulation (6) of the motor (4) and a device (7) for detecting the unbalance (15) of the Drum (3) are integrated in a microprocessor control (5). As an indication of a possibly This unbalance (15) can cause the fluctuations in the speed, the motor current consumption and / or the torque can be evaluated. In the present example, it creates with tachogenerator (8) connected to the motor shaft one of the respective rotational speeds of the laundry drum (3) corresponding voltage. To a control variable for the Mortorstromregel (6) e.g. in a known manner, the actual voltage generated by the tachometer generator (8) with a target voltage corresponding to the desired speed (reference voltage) compared. Depending on the control deviation, the motor control variable is influenced.
In die Trommelkappe (9) und den Trommelboden (10) sind Auswuchtsysteme eingesetzt (s. Figur 2), wobei zum Herstellen der kreisringförmigen Laufbahnen (12) ein preisgünstiges Tiefziehverfahren verwendet wird.Balancing systems are used in the drum cap (9) and the drum base (10) (see FIG. 2), an inexpensive method of producing the annular raceways (12) Thermoforming process is used.
Figur 3 zeigt einen Längsschnitt durch eine Laufbahn (12), wobei einzelne Kugeln (13) als Gewichte zu erkennen sind. Diese können sich in einer im Querschnitt kreisförmigen Laufbahn (12) meridional frei bewegen. Um die maximale Kompensation zu gewährleisten, muß jede Laufbahn (12) in dichtester Packung in einem Winkelbereich α ≈ 180° mit Kugeln (13) gefüllt werden. Damit bei horizontaler Rotationsachse die auf die Kugel (13) wirkende Schwerkraft ab einer gewünschten Rotationsgeschwindigkeit überwunden wird und die Kugeln (13) von der Laufbahn mitgenommen werden, muß diese mit einem viskosen Dämpfungsmittel (14) gefüllt werden, wobei vorteilhafterweise Öl verwendet wird. Ohne dieses Dämpfungsmittel (14) würden die Kugeln (13) lediglich der Rollreibung unterliegen und somit an der tiefsten Stelle der Laufbahn (12) abrollen, ohne ihre kompensatorische Wirkung zu entfalten.Figure 3 shows a longitudinal section through a raceway (12), with individual balls (13) as weights are recognizable. These can have a circular cross-section (12) move freely meridional. To ensure the maximum compensation, each track (12) in the densest packing in an angular range α ≈ 180 ° with balls (13) be filled. So with the horizontal axis of rotation the gravity acting on the ball (13) is overcome from a desired rotational speed and the balls (13) of the career, it must be with a viscous damping agent (14) be filled, advantageously using oil. Without this damping agent (14) the balls (13) would only be subject to rolling friction and thus at the lowest point of the Roll career (12) without developing their compensatory effect.
Die Funktionsweise der Auswuchtsysteme wird im Folgenden beschrieben:The operation of the balancing systems is described below:
Wie aus dem Diagramm in Figur 4 zu erkennen ist, durchläuft die Wäschetrommel (3) beim Beschleunigen von einer Waschdrehzahl nW einen Wäscheverteildrehzahlbereich tV. In diesem Verteildrehzahlbereich tV wird die Wäsche gut am Trommelumfang verteilt; damit eine bessere Entwässerung der Wäsche und eine geringstmögliche Unwucht (15) erreicht wird. Je nach Programmsteuerung kann im Anschluß an den Wäscheverteildrehzahlbereich tV ein Wäscheanlegedrehzahlbereich tA mit konstanter Anlegedrehzahl nA durchfahren werden. Im Verteildrehzahlbereich tV und/oder im Wäscheanlegedrehzahlbereich tA wird eine eventuell vorhandene Unwucht (15) von der Mikroprozessor-Steuerung (5) der Trommelwaschmaschine (1) sensiert. Die Sensierung der Größe und der Position der Unwucht (15) erfolgt durch die Auswertung der Schwankungen der Drehzahl, des Motorstroms oder des Drehmoments in bezug auf die Motoransteuerung. Dabei ist die Größe der Drehzahländerung ein Maß für die Größe der Unwucht (15). Die Drehzahl, die Mortorstromaufnahme bzw. das Drehmoment geben Aufschluß über die Position der Unwucht (15) in der Trommel (3).As can be seen from the diagram in FIG. 4, the laundry drum (3) runs through a laundry distribution speed range t V when accelerating from a washing speed n W. In this distribution speed range t V , the laundry is well distributed around the drum circumference; so that better dewatering of the laundry and the least possible imbalance (15) is achieved. Depending on the program control, a laundry application speed range t A with a constant application speed n A can be traversed following the laundry distribution speed range t V. In the distribution speed range t V and / or in the laundry supply speed range t A , any imbalance (15) that may be present is sensed by the microprocessor control (5) of the drum washing machine (1). The size and the position of the unbalance (15) are sensed by evaluating the fluctuations in the speed, the motor current or the torque in relation to the motor control. The size of the change in speed is a measure of the size of the unbalance (15). The speed, the Mortor current consumption and the torque provide information about the position of the unbalance (15) in the drum (3).
Bei Drehung mit Wäscheanlegedrehzahl nA unterliegen die Kugeln (13) noch der Schwerkraft und versuchen, zur tiefsten Stelle der Laufbahn (12) abzurollen. Durch Rollreibung und durch das viskose Dämpfungsmittel (14) erfolgt jedoch bereits eine Auslenkung in Drehrichtung (s. Figur 5). Erfolgt nun ein relativ schneller Hochlauf auf die Schleuderdrehzahl nS, so verharren die Kugeln (13), wie in Figur 6 dargestellt, als kompakte Kompensationsmasse beim Durchgang durch die Resonanzdrehzahl nR, bevor sie sich in der überkritischen Phase oberhalb nR korrekt verteilen (s. Figur 7).When rotating with laundry application speed n A , the balls (13) are still subject to gravity and try to roll to the lowest point of the raceway (12). Due to rolling friction and the viscous damping means (14), however, there is already a deflection in the direction of rotation (see FIG. 5). Will now be given a relatively rapid ramp up to the spin speed n S, so to remain the balls (13), as shown in Figure 6, a compact compensating mass while passing through the resonance speed n R before they are distributed properly in the supercritical phase above n R ( see Figure 7).
Wenn sich die Unwucht (15) unmittelbar vor dem Schleuderhochlauf (Rechtslauf), wie in Figur 6 dargestellt, gegenüber dem Schwerpunkt des Gewichts, also dem Gesamtschwerpunkt S aller Kugeln (13) befindet, ist sichergestellt, daß die Zentrifugalkraft der Kugeln (13) und der Unwucht (15) einander entgegenwirken. Statistisch gesehen können dann geringere Amplituden beim Resonanzdurchgang erwartet werden.If the unbalance (15) immediately before the spin start (clockwise rotation), as in Figure 6 shown, compared to the center of gravity of the weight, i.e. the total center of gravity S of all Balls (13) is ensured that the centrifugal force of the balls (13) and Counterbalance unbalance (15). Statistically speaking, lower amplitudes can then be used expected at the resonance passage.
Die Mikroprozessor-Steuerung (5) sensiert deshalb zuerst die Lage der Unwucht (15) und startet den Schleuderhochlauf erfindungsgemäß genau dann, wenn sich Unwucht (15) und Kugelschwerpunkt diametral gegenüberstehen. Dabei ist zu beachten, daß der Mikroprozessor-Steuerung (5) die Lage des Schwerpunktes (S) bekannt sein muß. Eine Sensierung mit Hilfe von Positionssensoren ist bei einer Verwendung von mehreren Einzelkugeln (13) mit vertretbarem Aufwand nicht möglich. Deshalb muß das Abrollverhalten der Kugeln (13) zuvor in Versuchsreihen beobachtet und die reibungsabhängige Position des Schwerpunktes (S) in einem Speicher der Mikroprozessor-Steuerung abgelegt werden. Entscheidend ist dabei die Tatsache, daß die viskose Dämpfung über einen bei Trommelwaschmaschinen (1) mit unterschiedlicher Laugentemperatur relevanten Temperaturbereich zwischen 20°C und 70°C mindestens um den Faktor 2 variiert, da keine viskosstabileren Flüssigkeiten bekannt sind. Der Phasenwinkel der Unwuchtposition beim Schleuderhochlauf muß deshalb in Abhängigkeit von der Temperatur () variiert werden, da sich je nach viskoser Dämpfung die Ablaufposition der Kugeln (13) im unterkritischen Drehzahlbereich ändert. Ebenso muß die Hochlaufbeschleunigung modifiziert werden, weil sich die Zeit zum Verteilen der Kugeln (13) je nach Viskosität des Dämpfungsmittels (14) ändert und erst damit eine Amplitudenreduktion beim Resonanzdurchgang gewährleistet wird. Die Temperatur () des Dämpfungsmittel ist mit der Laugentemperatur identisch und kann deshalb durch einen vorhandenen Temperaturfühler (18) am Laugenbehälter (2) erfaßt werden.The microprocessor control (5) therefore first senses the position of the unbalance (15) and starts the centrifugal run-up according to the invention exactly when unbalance (15) and Oppose the center of gravity of the ball diametrically. It should be noted that the microprocessor control (5) the location of the center of gravity (S) must be known. A sensation with the help of position sensors is used when using several individual balls (13) reasonable effort not possible. Therefore, the rolling behavior of the balls (13) must be in Test series observed and the friction-dependent position of the center of gravity (S) in be stored in a memory of the microprocessor control. The decisive factor here is The fact that the viscous damping with a drum washing machine (1) different lye temperature relevant temperature range between 20 ° C and 70 ° C Varies at least by a factor of 2, since no more viscosity-stable liquids are known. The The phase angle of the unbalance position during spin-up must therefore depend on the temperature () can be varied, since the drain position of the Balls (13) changes in the subcritical speed range. Acceleration must also be accelerated be modified because the time to distribute the balls (13) depending on Viscosity of the damping agent (14) changes and only then an amplitude reduction in Resonance passage is guaranteed. The temperature () of the damping agent is with the The alkali temperature is identical and can therefore be measured using an existing temperature sensor (18) be detected on the tub (2).
Figur 8 zeigt eine andere Ausführungsform, bei der statt einzelner Kugeln (13) Kugelzüge (16) verwendet werden. An den Enden eines jeden Kugelzuges (16) befindet sich jeweils ein Bimetallplättchen (17), welches je nach Temperatur die Spaltweite zu den Rändern der Laufbahn (12) variiert und damit die viskose Dämpfung der Kugelzüge (16) konstant hält. In diesem Falle wird das Anpassen der Hochlaufbeschleunigung sowie die temperaturabhängige Änderung des Phasenanschleuderwinkels entbehrlich. Ein weiterer Vorteil der Kugelzüge (16) besteht darin, daß die Gleitreibung untereinander und das Zusammenstoßen der Kugeln (13) unterbunden wird, was sich positiv auf die Geräuschsituation auswirkt.FIG. 8 shows another embodiment in which, instead of individual balls (13), ball trains (16) be used. At the ends of each ball train (16) there is one Bimetal plate (17), which, depending on the temperature, the gap width to the edges of the track (12) varies and thus keeps the viscous damping of the ball trains (16) constant. In this Trap will be the adaptation of the acceleration, as well as the temperature-dependent change dispensing with the phase spin angle. Another advantage of the ball trains (16) is in that the sliding friction with each other and the collision of the balls (13) is prevented, which has a positive effect on the noise situation.
Claims (11)
- Method for the balancing of rotating bodies by using a device comprising an annular-shaped raceway (12), which rotates with the body and is disposed concentrically relative to its axis of rotation and within which at least two weights (13; 16) are disposed so as to be freely displaceable, characterised by the following method stepsacceleration of the body to a first speed (nV; nA), at which a stationary imbalance (15) is developed,recording of the position of the imbalance (15),subsequent acceleration of the body to a second speed (nS) above the critical speed of the body or of its bearing system from a position at which the imbalance (15) is located opposite the centre of gravity (S) of the weights.
- Method for the balancing of rotating bodies according to claim 1, characterised in that the subsequent acceleration is effected in a sudden manner before the critical speed (nR) is obtained.
- Method for the balancing of the drum (3) of a drum washing machine (1) according to one of the claims 1 or 2, characterised in that the position of the imbalance (15) at the start-up of the spinning procedure is recorded in the distribution or application speed range (tV ; tA).
- Device for the execution of the method for the balancing of rotating bodies, more especially the drum (3) of a drum washing machine (1), according to one of the claims 1 to 3, characterised in that a means for increasing the running friction of the weights is disposed in the raceway (12).
- Device according to claim 4, characterised in that the raceway (12) is filled at least partially with a viscous damping means (14).
- Device according to one of the claims 4 or 5, characterised by an arrangement for the recording of the size and the position of an imbalance (15) through the intermediary of a speed-dependent characteristic of the drive motor (14) for the rotating of the body.
- Device according to claims 5 to 6, characterised in that a temperature recording arrangement (18) records the temperature (v) of the viscous damping means (14) and in that a control arrangement accelerates the body from one position, which is dependent on the temperature and on the position of the imbalance (15), to the second speed (nS).
- Device according to claim 7, characterised in that the control arrangement controls the rate of the increase in speed in a temperature-dependent manner.
- Device according to one of the claims 4 to 8, characterised in that balls (13) are used as weights.
- Device according to one of the claims 4 to 8, characterised in that ball trains (16) are used as weights.
- Device according to claim 10, characterised in that at least one plate (17) is disposed on the ball trains (16), which plate (17) has a temperature-dependent changeable cross-sectional area at right angles to the direction of displacement.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19718321 | 1997-04-30 | ||
DE19718321A DE19718321C1 (en) | 1997-04-30 | 1997-04-30 | Process for balancing rotating bodies |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0878575A1 EP0878575A1 (en) | 1998-11-18 |
EP0878575B1 true EP0878575B1 (en) | 2002-06-19 |
Family
ID=7828260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98107766A Expired - Lifetime EP0878575B1 (en) | 1997-04-30 | 1998-04-29 | Method for balancing a rotating body |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0878575B1 (en) |
DE (2) | DE19718321C1 (en) |
ES (1) | ES2178074T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101230532B (en) * | 2007-01-24 | 2011-10-12 | 三星电子株式会社 | Washing machine with balancers and control method thereof |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19842611C2 (en) * | 1997-12-10 | 2000-11-16 | Miele & Cie | Washer or washer dryer |
ES2186081T3 (en) * | 1997-12-20 | 2003-05-01 | Miele & Cie | DRUM WASHING MACHINE OR CLOTHING DRYER AND PROCEDURE FOR WASHING AND CENTRIFUGING THE COLADA IN A WASHING MACHINE OR IN A CLOTHING DRYER. |
DE19802929C1 (en) * | 1998-01-27 | 1999-02-04 | Miele & Cie | Machine for balancing rotary transmission components |
DE19849594C1 (en) * | 1998-10-27 | 2000-03-30 | Miele & Cie | Washing machine or tumble drier with an uneven weight balancing mechanism, comprises a container with a drum, a drive motor, and a drum balancing system |
DE19952464C2 (en) * | 1999-10-29 | 2002-05-08 | Miele & Cie | Method for balancing a rotating body which is set in rotation by a controlled drive, and use of the method |
DE10000235B4 (en) * | 2000-01-05 | 2005-09-22 | Snap-On Equipment Gmbh | Device for measuring a rotor imbalance |
DE10116977C2 (en) * | 2000-05-17 | 2003-03-27 | Miele & Cie | Washing machine with a balancing device |
US6578225B2 (en) * | 2000-05-25 | 2003-06-17 | Skf Autobalance Systems Ab | Low-speed prebalancing for washing machines |
CN1183283C (en) | 2000-06-23 | 2005-01-05 | 惠尔普尔公司 | Method and hanging system for reducing displacement of dolly tub during high speed dewatering circulation |
KR101267334B1 (en) | 2006-11-06 | 2013-05-23 | 삼성전자주식회사 | Ball balancer Control Method of Washing Machine |
WO2010105313A1 (en) * | 2009-03-20 | 2010-09-23 | Safedin Zelic | Inertial auto balancing mechanism |
KR101689714B1 (en) | 2010-04-01 | 2016-12-26 | 엘지전자 주식회사 | Washing machine and method for controlling thereof |
US9493897B2 (en) | 2013-06-25 | 2016-11-15 | Whirlpool Corporation | Method of operation for a laundry treating appliance having a ball balance ring |
DE102017219081A1 (en) | 2017-10-25 | 2019-04-25 | BSH Hausgeräte GmbH | Method for operating a domestic appliance for the care of laundry items with detection of an imbalance based on two input channels and household appliance |
DE102018105894A1 (en) | 2018-03-14 | 2019-09-19 | Miele & Cie. Kg | Balancing device, drum washing machine with a balancing device and method for balancing |
FR3087862B1 (en) | 2018-10-26 | 2020-12-11 | Airbus Helicopters | SYSTEM AND METHOD FOR ADJUSTING THE BEHAVIOR OF A POWER TRANSMISSION SHAFT |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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FR1213067A (en) * | 1957-11-08 | 1960-03-29 | Frame | Washing machine |
DE1912481U (en) * | 1961-07-24 | 1965-03-18 | Siemens Elektrogeraete Gmbh | DEVICE FOR SPINNING WASHING WITH ELASTIC SUSPENSION OF THE DRUM UNIT. |
GB1598399A (en) * | 1977-06-02 | 1981-09-16 | Hitachi Ltd | Drum type automatic electric washing machine |
DE3822924C1 (en) * | 1988-07-07 | 1989-11-23 | Miele & Cie Gmbh & Co, 4830 Guetersloh, De | |
CA2069120C (en) * | 1992-05-21 | 2005-04-26 | Anton Gasafi | Weight compensating method and apparatus |
IT1289380B1 (en) * | 1996-05-30 | 1998-10-02 | Electrolux Zanussi Elettrodome | WASHING MACHINE WITH PERFECTED DYNAMIC BALANCING PROCEDURE |
-
1997
- 1997-04-30 DE DE19718321A patent/DE19718321C1/en not_active Expired - Fee Related
-
1998
- 1998-04-29 EP EP98107766A patent/EP0878575B1/en not_active Expired - Lifetime
- 1998-04-29 ES ES98107766T patent/ES2178074T3/en not_active Expired - Lifetime
- 1998-04-29 DE DE59804484T patent/DE59804484D1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101230532B (en) * | 2007-01-24 | 2011-10-12 | 三星电子株式会社 | Washing machine with balancers and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
ES2178074T3 (en) | 2002-12-16 |
DE19718321C1 (en) | 1998-10-29 |
EP0878575A1 (en) | 1998-11-18 |
DE59804484D1 (en) | 2002-07-25 |
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