FR2524021A1 - Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads - Google Patents

Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads Download PDF

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Publication number
FR2524021A1
FR2524021A1 FR8205257A FR8205257A FR2524021A1 FR 2524021 A1 FR2524021 A1 FR 2524021A1 FR 8205257 A FR8205257 A FR 8205257A FR 8205257 A FR8205257 A FR 8205257A FR 2524021 A1 FR2524021 A1 FR 2524021A1
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FR
France
Prior art keywords
motor
washing machine
drum
machine according
resistive torque
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.)
Granted
Application number
FR8205257A
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French (fr)
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FR2524021B1 (en
Inventor
Laurent Didier
Jean-Claude Geay
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Esswein SA
Original Assignee
Esswein SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esswein SA filed Critical Esswein SA
Priority to FR8205257A priority Critical patent/FR2524021A1/en
Priority to DE8383400576T priority patent/DE3362234D1/en
Priority to EP83400576A priority patent/EP0090716B1/en
Priority to ES520992A priority patent/ES520992A0/en
Publication of FR2524021A1 publication Critical patent/FR2524021A1/en
Application granted granted Critical
Publication of FR2524021B1 publication Critical patent/FR2524021B1/fr
Granted legal-status Critical Current

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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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/304—Arrangements or adaptations of electric motors
    • 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
    • D06F34/08—Control circuits or arrangements thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
    • H02H7/0857—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken by lowering the mechanical load of the motor
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/46—Current or voltage of the motor driving the drum
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Abstract

Power requirements on a loaded motor for a washing machine are controlled by a feedback circuit which disengage the motor for sufficient intervals during use to prevent overheating when subject to high load effects, e.g. because use for items which are highly absorbent and also too coherent to distribute uniformly around the drum, e.g. napkins or dish cloths. The control circuit involves a microprocessor which compares a signal related to the nominal speed of the drum with a tachegraph signal which indicates the actual speed of the drum. A difference in the signal, due to slowing of the drum by an overload, is converted to a phase angle differential which upon reaching 180 deg. C in response to a predetermined difference, holds a triac circuit open to stop the motor. Allows overall motor size and cost, in respect of the copper windings or their heat dissipation systems, to be reduced below that necessary to cope with occasional anticipated operating overload levels without stopping or overheating.

Description

LAVE-LINGE A MOTEUR D'ENTRAîNEMENT
DU TAMBOUR DE PUISSANCE REDUITE.DRIVE WASHING MACHINE
REDUCED POWER DRUM.

L'invention est relative à un lave-linge à tambour tournant entrainé par un moteur électrique. The invention relates to a washing machine with rotating drum driven by an electric motor.

Le couple résistant opposé par le tambour et son contenu au moteur électrique d'entrainement peut prendre des valeurs très variables qui dépendent notamment de la répartition et de la nature du linge dans le tambour. Les conditions les plus défavorables, c'està-dire le couple résistant le plus élevé, apparaissent pour des charges de volume faible et de grande densité telles que des serviettes-éponges qui accumulent beaucoup d'eau et quine sont pas réparties de façon régulière dans le tambour. The resistance torque opposed by the drum and its content to the electric drive motor can take very variable values which depend in particular on the distribution and the nature of the laundry in the drum. The most unfavorable conditions, that is to say the highest resistive torque, appear for loads of low volume and high density such as sponge towels which accumulate a lot of water and which are not evenly distributed in the drum.

Le moteur d'entrainement est habituellement dimensionné pour s'opposer aux couples résistants les plus importants sans que ses enroulements subissent un échauffement prohibitif. The drive motor is usually dimensioned to oppose the greatest resistance torques without its windings undergoing prohibitive heating.

L'invention permet d'entrainer le tambour à l'aide d'un moteur de puissance inférieure et donc meilleur marché, le fonctionnement restant satisfaisant pour toutes les charges de linge et l'échauffement des enroulements du moteur restant malgré tout limité. The invention makes it possible to drive the drum using a motor of lower power and therefore cheaper, the operation remaining satisfactory for all loads of laundry and the heating of the windings of the motor remaining nevertheless limited.

A cet effet, selon l'invention, on prévoit un moyen pour faire varier l'énergie de brassage du linge, notamment le nombre de rotations du tambour en un temps déterminé, en fonction du couple résistant s'opposant au moteur. To this end, according to the invention, there is provided a means for varying the stirring energy of the laundry, in particular the number of rotations of the drum in a determined time, as a function of the resistive torque opposing the motor.

On diminue ainsi l'énergie de brassage, c'est-à-dire le temps de rotation du moteur, quand le couple résistant augmente. De cette manière la quantité de cuivre utilisé pour constituer les enroulements du moteur peut être réduite à un minimum. This reduces the stirring energy, that is to say the motor rotation time, when the resistive torque increases. In this way the amount of copper used to make up the motor windings can be reduced to a minimum.

Dans une réalisation, pour faire varier l'énergie de brassage, on modifie le temps d'arrêt du tambour entre deux rotations au cours d'une phase de lavage.  In one embodiment, to vary the stirring energy, the stopping time of the drum is modified between two rotations during a washing phase.

Pour faire varier l'énergie de brassage on peut également modifier le temps de rotation du tambour entre deux périodes de repos. To vary the stirring energy, it is also possible to modify the rotation time of the drum between two periods of rest.

Dans le cas le plus simple l'énergie de brassage ne prend que deux valeurs distinctes. Une première valeur correspond aux charges normales de linge et une seconde valeur, inférieure à la première, à une charge anormale, c'est-à-dire un couple résistant élevé. Mais Iténergie de brassage peut également varier de façon continue en fonction du couple résistant, par exemple de façon inversement proportionnelle à ce couple. In the simplest case, the stirring energy takes only two distinct values. A first value corresponds to normal laundry loads and a second value, lower than the first, to an abnormal load, that is to say a high resistive torque. However, the stirring energy can also vary continuously as a function of the resistive torque, for example inversely proportional to this torque.

Pour la détection des variations du couple résistant on fait appel, par exemple, aux variations de l'intensité du courant électrique traversant le moteur. For the detection of variations in the resistive torque, use is made, for example, of variations in the intensity of the electric current passing through the motor.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels:
- la figure 1 est un schéma simplifié d'un moteur, de son circuit d'alimentation et de son circuit de commande faisant partie d'un lave-linge selon l'invention,
- la figure 2 est un schéma illustrant le fonctionnement du dispositif de la figure 1, et
- la figure 3 est un organigramme pour un microprocesseur du dispositif de la figure 1.Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
FIG. 1 is a simplified diagram of an engine, of its supply circuit and of its control circuit forming part of a washing machine according to the invention,
FIG. 2 is a diagram illustrating the operation of the device in FIG. 1, and
- Figure 3 is a flow diagram for a microprocessor of the device of Figure 1.

Dans l'exemple le lave-linge comprend, pour ltentrainement du tambour, un moteur électrique 10 alimenté en courant alternatif (figure 2) et la vitesse de ce moteur est modifiable en faisant varier la puissance qui lui est fournie. A cet effet on prévoit une alimentation à découpage, c'est-à-dire un interrupteur 11, tel qu'un triac, en série avec un conducteur 12 d'alimentation de ce moteur, et un circuit de commande de cet interrupteur de façon qu'à chaque alternance du courant alternatif cet interrupteur 11 ne soit fermé que pendant le temps suffisant pour obtenir la puissance ou la vitesse désirée. En variante le moteur est alimenté en courant continu.  In the example, the washing machine comprises, for the drum drive, an electric motor 10 supplied with alternating current (FIG. 2) and the speed of this motor can be modified by varying the power supplied to it. To this end, a switching power supply is provided, that is to say a switch 11, such as a triac, in series with a conductor 12 supplying this motor, and a circuit for controlling this switch so that at each alternation of the alternating current this switch 11 is closed only for the time sufficient to obtain the desired power or speed. As a variant, the motor is supplied with direct current.

La vitesse du moteur est asservie à une consigne fournie par un programmateur. Cette consigne dépend de l'opération effectuée par la machine: lavage, rinçage, défoulage, essorage, remplissage en eau. The motor speed is controlled by a setpoint provided by a programmer. This setpoint depends on the operation carried out by the machine: washing, rinsing, steam release, spinning, filling with water.

Dans l'exemple la consigne est en mémoire d'un microprocesseur 13 présentant une entrée 14 sur laquelle est appliqué le signal de sortie d'une génératrice tachymétrique 15 entrainée par le moteur 10. Ce microprocesseur 13 présente également une sortie 16 destinée à commander l'interrupteur 11 par l'intermédiaire d'un circuit interface 17. In the example, the setpoint is in memory of a microprocessor 13 having an input 14 to which is applied the output signal of a tachometric generator 15 driven by the motor 10. This microprocessor 13 also has an output 16 intended to control the switch 11 via an interface circuit 17.

Le microprocesseur est programmé pour calculer le signal d'erreur c qui est égal à la différence entre la vitesse réelle du moteur et sa vitesse de consigne. Le microprocesseur transforme le signal c en un angle d'allumage e, compris entre 0 et 1800 (figure 2) du triac 11. Un angle O égal à 0 correspond à une conduction du triac 11 pendant la totalité de la demie-alternance correspondante, c'est-à-dire l'alimentation du moteur 10 à pleine puissance, tandis que pour un angle de 1800 le triac reste constamment ouvert, c'està-dire que le moteur 10 n'est pas alimenté et reste à l'arrêt. The microprocessor is programmed to calculate the error signal c which is equal to the difference between the actual speed of the motor and its set speed. The microprocessor transforms the signal c into an ignition angle e, between 0 and 1800 (figure 2) of the triac 11. An angle O equal to 0 corresponds to a conduction of the triac 11 during the whole of the corresponding half-wave, that is to say the power supply of the motor 10 at full power, while for an angle of 1800 the triac remains constantly open, that is to say that the motor 10 is not supplied and remains stopped .

En d'autres termes un petit angle d'allumage correspond à une puissance importante fournie au moteur. In other words, a small ignition angle corresponds to a large power supplied to the engine.

Le montage est tel que la qualité de la régulation n'est pas trop importante afin que le signal d'erreur n'ait pas une valeur trop petite. The assembly is such that the quality of the regulation is not too important so that the error signal does not have a too small value.

Ce signal d'erreur est une fonction,le plus souvent directe, du couple résistant s'opposant au moteur. Plus le couple résistant est grand, plus le signal d'erreur C est important. Il en résulte que plus le couple résistant est important plus l'angle d'allumage e est faible car, pour s'opposer à un couple résistant de grande valeur, il faut apporter une énergie importante. This error signal is a function, most often direct, of the resistive torque opposing the motor. The greater the resistive torque, the greater the error signal C. As a result, the greater the resistive torque, the lower the ignition angle e because, to oppose a resistive torque of great value, it is necessary to provide significant energy.

L'angle e constitue donc une mesure du couple résistant qui est utilisée pour faire varier l'énergie de brassage du linge, notamment lors des périodes de lavage.  The angle e therefore constitutes a measure of the resisting torque which is used to vary the stirring energy of the laundry, in particular during washing periods.

Dans l'exemple si l'angle d'allumage O est supérieur à une valeur minimale em égale à 600 le tambour tourne pendant cinq secondes dans un sens, s'arrête pendant dix secondes puis tourne de nouveau, mais dans l'autre sens, pendant une période de cinq secondes et ainsi de suite. In the example if the ignition angle O is greater than a minimum value em equal to 600 the drum turns for five seconds in one direction, stops for ten seconds and then turns again, but in the other direction, for a period of five seconds and so on.

Par contre si l'angle d'allumage e est inférieur à la valeur minimale de 60 , c'est-à-dire que la puissance demandée au moteur est importante, ce qui signifie un fort couple résistant, les périodes d'arrêt sont allongées: elles sont alors de vingt secondes, les périodes de rotation dans un sens ou dans l'autre s'effectuant toujours pendant une durée de cinq secondes. Ainsi en cas de charge normale de linge, c'est-à-dire de couple résistant de valeur modérée, la puissance fournie au moteur est limitée, ce qui limite d'autant l'échauffement de ses enroulements. Par contre lorsque la charge de linge est anormale le couple résistant est élevé et la puissance fournie est alors importante ce qui entraine un échauffement important des enroulements. L'allongement du temps d'arrêt permet alors aux enroulements de se refroidir. On the other hand, if the ignition angle e is less than the minimum value of 60, that is to say that the power required from the engine is high, which means a high resistive torque, the stopping periods are lengthened : they are then twenty seconds, the periods of rotation in one direction or the other always taking place for a duration of five seconds. Thus, in the event of normal load of linen, that is to say of a resistant torque of moderate value, the power supplied to the motor is limited, which therefore limits the heating of its windings. On the other hand, when the load of linen is abnormal, the resistance torque is high and the power supplied is then significant, which causes significant heating of the windings. The extension of the downtime then allows the windings to cool.

La figure 3, qui fait partie intégrante de la présente description, est un organigramme montrant comment est programmé le microprocesseur 13 pour modifier le temps d'arrêt du tambour entre deux rotations. Sur cet organigramme, de façon classique, à un rectangle correspond une opération à effectuer tandis qu'un losange correspond à une comparaison. FIG. 3, which is an integral part of the present description, is a flow diagram showing how the microprocessor 13 is programmed to modify the stop time of the drum between two rotations. On this flowchart, conventionally, a rectangle corresponds to an operation to be performed while a rhombus corresponds to a comparison.

En variante si on constate que le couple résistant dépasse la valeur limite, on diminue le temps de rotation du tambour par exemple de cinq secondes à trois secondes tandis que le temps d'arrêt de dix secondes entre deux rotations reste inchangé. Alternatively if it is found that the resistive torque exceeds the limit value, the rotation time of the drum is reduced for example from five seconds to three seconds while the stop time of ten seconds between two rotations remains unchanged.

Selon une autre disposition de l'invention si le couple résistant reste prohibitif pendant un temps déterminé et Si, en même temps, la génératrice tachymétrique 15 ne fournit pas de signal, c'est-à- dire que le moteur est arrêté, l'alimentation dudit moteur est interrompue. Dans l'exemple on coupe l'alimentation, c'est-à-dire qu'on maintient constamment ouvert l'interrupteur 11, si pendant cinq alternances du signal alternatif d'alimentation il a été constaté, par le microprocesseur 13, que l'angle d'allumage est resté inférieur à 600 et si simultanément l'information de vitesse (représentée par le signal sur l'entrée 14) a disparu. Une telle sécurité, réalisée par une programmation du microprocesseur, est plus simple et plus fiable que celle utilisée habituellement qui consiste à détecter la température des enroulements du moteur et à couper l'alimentation de ce moteur en cas d'échauffement excessif qui risquerait de le détruire.  According to another provision of the invention if the resistive torque remains prohibitive for a determined time and If, at the same time, the tachometer generator 15 does not provide a signal, that is to say that the engine is stopped, the power supply to said motor is interrupted. In the example, the supply is cut off, that is to say that the switch 11 is constantly kept open, if during five alternations of the alternating supply signal it has been observed, by the microprocessor 13, that the the ignition angle remained below 600 and if simultaneously the speed information (represented by the signal on input 14) has disappeared. Such security, achieved by microprocessor programming, is simpler and more reliable than that usually used which consists of detecting the temperature of the motor windings and cutting off the power to this motor in the event of excessive heating which would risk destroy.

Claims (10)

REVENDICATIONS 1. Lave-linge caractérisé en ce qu'il comprend un moyen pour faire varier l'énergie de brassage du linge en fonction du couple résistant s'opposant au moteur (10). 1. Washing machine characterized in that it comprises a means for varying the stirring energy of the linen as a function of the resistive torque opposing the motor (10). 2. Lave-linge selon la revendication 1, caractérisé en ce que l'énergie de brassage diminue quand le couple résistant augmente. 2. Washing machine according to claim 1, characterized in that the stirring energy decreases when the resistive torque increases. 3. Lave-linge selon la revendication 2, caractérisé en ce que le nombre de tours du tambour pendant un temps donné diminue quand le couple résistant augmente. 3. Washing machine according to claim 2, characterized in that the number of revolutions of the drum during a given time decreases when the resistive torque increases. 4. Lave-linge selon la revendication 3, caractérisé en ce que le tambour tourne pendant des périodes de durée constante séparées par des périodes d'arrêt de durée variant dans le même sens que le couple résistant. 4. Washing machine according to claim 3, characterized in that the drum rotates during periods of constant duration separated by stopping periods of duration varying in the same direction as the resistive torque. 5. Lave-linge selon la revendication 3, caractérisé en ce que le tambour tourne pendant des périodes de durée variant en sens contraire des variations du couple résistant, périodes qui sont séparées par des arrêts de durée constante. 5. Washing machine according to claim 3, characterized in that the drum rotates during periods of duration varying in opposite direction to variations of the resistive torque, periods which are separated by stops of constant duration. 6. Lave-linge selon l'une quelconque des revendications 3 - à S, caractérisé en ce que l'énergie de brassage peut prendre deux valeurs distinctes, la plus grande correspondant à un couple résistant inférieur à une valeur limite et la plus petite correspondant à un couple résistant supérieur à la valeur limite. 6. Washing machine according to any one of claims 3 - to S, characterized in that the stirring energy can take two distinct values, the largest corresponding to a resistive torque less than a limit value and the smallest corresponding at a resistive torque greater than the limit value. 7. Lave-linge selon l'une quelconque des revendications précédentes et comprenant un circuit de régulation (13, IS, 17, 11) pour asservir la vitesse du moteur (10) d'entraînement du tambour à une consigne fournie par un programmateur, caractérisé en ce qu'un interrupteur (11) étant en série avec l'alimentation (12) du moteur (10), et un moyen de commande permettant de transformer les valeurs de signal d'erreur (C) en valeurs de durée de conduction de l'interrupteur (11) au cours d'une période donnée, un moyen est prévu pour modifier lténergie de brassage en fonction de ladite durée de conduction de l'interrupteur (11).  7. Washing machine according to any one of the preceding claims and comprising a regulation circuit (13, IS, 17, 11) for controlling the speed of the motor (10) driving the drum to a setpoint provided by a programmer, characterized in that a switch (11) being in series with the power supply (12) of the motor (10), and a control means making it possible to transform the values of error signal (C) into values of conduction time of the switch (11) during a given period, means are provided for modifying the stirring energy as a function of said duration of conduction of the switch (11). 8. Lave-linge selon la revendication 7, caractérisé en ce qu'il comprend un microprocesseur (13) pour calculer le signal d'erreur ( e) et la durée de conduction et modifier l'énergie de brassage en fonction du couple résistant. 8. Washing machine according to claim 7, characterized in that it comprises a microprocessor (13) for calculating the error signal (e) and the conduction time and modifying the stirring energy as a function of the resistive torque. 9. Lave-linge selon la revendication 7 ou 8, caractérisé en ce qu'il comprend une génératrice tachymétrique (15) entrainée par le moteur (10) pour fournir le signal de vitesse réelle. 9. Washing machine according to claim 7 or 8, characterized in that it comprises a tachometer generator (15) driven by the motor (10) to provide the actual speed signal. 10. Lave-linge selon l'une quelconque des revendications pré cédentes, caractérisé en ce qu'il comprend un moyen pour interrompre l'alimentation du moteur lorsque, simultanément, le couple résistant dépasse une valeur limite et le moteur est à l'arrêt.  10. Washing machine according to any one of the preceding claims, characterized in that it comprises means for interrupting the supply of the motor when, simultaneously, the resistive torque exceeds a limit value and the motor is stopped. .
FR8205257A 1982-03-26 1982-03-26 Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads Granted FR2524021A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR8205257A FR2524021A1 (en) 1982-03-26 1982-03-26 Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads
DE8383400576T DE3362234D1 (en) 1982-03-26 1983-03-18 Clothes washer with a reduced-power motor for driving the drum
EP83400576A EP0090716B1 (en) 1982-03-26 1983-03-18 Clothes washer with a reduced-power motor for driving the drum
ES520992A ES520992A0 (en) 1982-03-26 1983-03-25 CLOTHING WASHER WITH REDUCED POWER DRIVE MOTOR.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8205257A FR2524021A1 (en) 1982-03-26 1982-03-26 Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads

Publications (2)

Publication Number Publication Date
FR2524021A1 true FR2524021A1 (en) 1983-09-30
FR2524021B1 FR2524021B1 (en) 1985-01-04

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FR8205257A Granted FR2524021A1 (en) 1982-03-26 1982-03-26 Overload feedback controls for washing machine motor - allow relatively small motor to be used without damage by occasional peak loads

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* Cited by examiner, † Cited by third party
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FR2454625A1 (en) * 1979-04-19 1980-11-14 Bauknecht Gmbh G Washing machine drum speed and imbalance detector - has disc provided with alternate light and dark areas scanned by photocell and connected to machine programmer
US4235085A (en) * 1978-04-04 1980-11-25 Tokyo Shibaura Denki Kabushiki Kaisha Automatic washer
FR2489384A1 (en) * 1980-09-02 1982-03-05 Esswein Sa Automatic device to counteract imbalance in centrifuge loading - by temporary interruption of power supply permitting load redistribution
EP0056437A2 (en) * 1981-01-19 1982-07-28 Siemens Aktiengesellschaft Method and device for the determination of the load of apparatuses driven by electric motors

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