EP0565157A1 - Procédé pour la détection et la compensation d'un balourd d'un rotor entrainé par un moteur - Google Patents

Procédé pour la détection et la compensation d'un balourd d'un rotor entrainé par un moteur Download PDF

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Publication number
EP0565157A1
EP0565157A1 EP93200732A EP93200732A EP0565157A1 EP 0565157 A1 EP0565157 A1 EP 0565157A1 EP 93200732 A EP93200732 A EP 93200732A EP 93200732 A EP93200732 A EP 93200732A EP 0565157 A1 EP0565157 A1 EP 0565157A1
Authority
EP
European Patent Office
Prior art keywords
motor
unbalance
speed
rotor
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.)
Ceased
Application number
EP93200732A
Other languages
German (de)
English (en)
Inventor
Lutz Scholten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0565157A1 publication Critical patent/EP0565157A1/fr
Ceased 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for detecting and compensating for an unbalance in a rotor driven by an electric motor, e.g. in a washing drum of a washing machine, with a device for measuring the unbalance by position and size and with electronics for controlling the motor based on the measured unbalance values.
  • a method for controlling the spinning process of a drum washing machine which has a tub with a drum rotatably mounted therein, a controllable electric motor for driving the drum and a device for measuring the unbalance of the drum.
  • the drum is accelerated from a position of the unbalance determined by the unbalance measuring device immediately before or when ramping up to the spin speed, this position of the unbalance being characterized by a drop in speed, an increased motor current consumption and an increased torque.
  • the position and the size of the unbalance can be determined during the acceleration or run-up phase for spinning in the laundry distribution laundry application speed range. In these known methods, the deflection of the vibrating unit caused by imbalance is reduced.
  • the known method is intended to enable spinning even if one is not permitted there is high unbalance.
  • the fluctuations in the speed, the motor current consumption and / or the torque can be evaluated as an indication of a possible unbalance.
  • a tachometer generator connected to the motor shaft generates an actual voltage corresponding to the respective speed of the laundry drum, which is compared with a target voltage corresponding to the desired speed.
  • the motor is controlled accordingly.
  • the size of the change in speed is a measure of the size of the unbalance, while the speed, the motor current consumption or the torque provide information about the position of the unbalance of the drum.
  • the acceleration of the laundry drum can also be achieved when the critical speed ranges are passed through a corresponding motor power control in the course of a few drum revolutions. This can also reduce the vibration amplitude of the indoor unit.
  • the acceleration in an angular range from 60 ° to 170 ° can be greater than zero, while the acceleration in the remaining angular range can go to zero, be zero or even become negative.
  • the invention has for its object to provide an effective, reliable and simple method of the type mentioned with simple means.
  • the minimum value to which the rotor is initially accelerated in this detection phase is the value at which a rotor's own imbalance is noticeable.
  • the drum is first accelerated to a value of around 70 rpm. This is the value at which the laundry in the drum deposits on the inner walls, so that an imbalance caused by the uneven distribution of the laundry is now noticeable. It is therefore important to control the motor drive in such a way that a constant drive torque results.
  • neither currents nor the difference between the desired speed and the actual speed are evaluated in the design according to the invention.
  • control variables are generated which generate an engine torque that is independent of the speed and the load (unbalance present / not present). This makes it possible to easily generate a constant torque for the motor drive, so that the speed changes generated by an imbalance that occurs can be evaluated in an exact manner to determine the size and position of the imbalance.
  • the determination of the values for the size and the position of the unbalance is preferably carried out by evaluating a pulse chain supplied by an encoder of the motor by the electronics with the aid of a pulse counter in such a way that both the The respective speed of the motor shaft and the respective position of a fictitious point on the motor shaft are available and that the speed of the rotor and the position and size of a possible imbalance on the rotor can thus be detected.
  • the pulse counter is incremented by each flank of the pulse chain.
  • the meter reading is carried out within certain short periods of time, the duration of which corresponds in each case to a fraction of the duration of a rotor revolution.
  • the size of the speed is preferably determined by detecting the change in the counter reading per time period and dividing it by the time elapsing between the time periods, resulting in a measured variable proportional to the speed. The difference between the maximum and minimum rotor speed is recorded and evaluated to determine the size of the unbalance.
  • the position of the unbalance is determined by detecting the change in the counter reading per time period and dividing it by the number of possible pulses per rotor rotation, which results in a measured variable that changes the position of a fictitious point on the rotor , e.g. describes the unbalance, per time period (relative position).
  • the absolute position of the unbalance is recorded when the maximum or minimum rotor speed occurs.
  • the position of an unbalance determined with the aid of the speed curve is always tracked in a further embodiment of the invention so that it is at all times in the control program is available for the engine.
  • control variables are generated which produce a torque on the motor shaft which corresponds to the torque required for medium acceleration plus a torque required for compensation , whereby the moment required for compensation depends on the size and position of the unbalance.
  • These control variables are determined in the electronics on the basis of the values found for the position and size of the unbalance in the detection phase. Depending on the position of the unbalance, energy must either be supplied or energy must be destroyed so that the rotor receives the desired acceleration.
  • control variables required to generate the compensation torque are stored in a characteristic field as a calculation variable in a ROM. This means that when the rotor accelerates to higher speeds, the electronics will show where they were before there is already an unbalance determined by size, and that based on these values, control values are supplied based on the stored characteristic field, which are required to generate the compensation torque.
  • the above method is applied to a household appliance loaded with laundry, e.g. in a washing machine, the household appliance being accelerated to a minimum rotation of about 70 rpm before the start of the detection and compensation process, so that the unbalanced laundry adheres to the inside wall of the drum.
  • a household appliance loaded with laundry e.g. in a washing machine
  • the household appliance being accelerated to a minimum rotation of about 70 rpm before the start of the detection and compensation process, so that the unbalanced laundry adheres to the inside wall of the drum.
  • this ensures that an imbalance produced by uneven distribution of the laundry becomes effective and can thus be detected according to position and size.
  • a simple and reliable arrangement for carrying out a method of the type mentioned above is preferably characterized by a converter connected to the mains for generating a supply voltage for the motor and by a microcontroller for controlling the motor, which contains a memory (ROM) and display and operating elements and which is connected to a rotary encoder and to the converter.
  • a converter connected to the mains for generating a supply voltage for the motor and by a microcontroller for controlling the motor, which contains a memory (ROM) and display and operating elements and which is connected to a rotary encoder and to the converter.
  • the converter preferably has a switching frequency of 20 kHz.
  • the structure of the arrangement according to the invention has the advantage that a torque of three to four times the nominal torque can be reached for a short time without the drive being damaged.
  • the highest possible torque enables a satisfactory result, especially in the area of the mechanical resonance speed.
  • Active unbalance compensation should be used in this rotation range. Since the product of torque and angular velocity gives the power and because a high torque at relatively high speed is required during the compensation, there is a short-term high power requirement, which is covered by the overloadable drive.
  • 1 and 2 show a schematic front and side view of a washing machine
  • FIG. 3 shows a circuit diagram for controlling a motor for driving the washing machine
  • FIG. 4 shows the course of the control voltage for the motor.
  • the washing machine contains a housing 10 in which an oscillatingly mounted tub 11 is arranged, which is supported on the one hand by shock absorbers 12 on the floor 13 and on the other hand is suspended by springs 14 on the ceiling of the housing.
  • a drum 15 Arranged inside the tub 11 is a drum 15 which is rotatably mounted on one side and which, in the further course of the description, also functions as Rotor is called and which is driven by a motor 16 attached to the tub 11.
  • the springs 14 are shown schematically as a spring and the shock absorbers 12 as a shock absorber.
  • FIG. 3 shows an electronic system containing a converter 17 and a microcontroller 18 for controlling the drive motor 16.
  • the converter 17 is connected on the input side to a network 19 and is used to generate an output voltage 20 for the motor 16.
  • the microcontroller 18 contains a memory 21 and Display and operating elements 22 and is connected on the one hand via lines 23a, b to the converter 17 and on the other hand via a line 24 to a rotary encoder 25 which is seated on the motor shaft 26.
  • the converter 17 contains a rectifier bridge 27 for rectifying the mains voltage 19, a downstream smoothing capacitor 28 for smoothing an applied intermediate circuit voltage 29 to a constant value, an automatically switchable braking resistor 30 for converting electrical energy obtained from kinetic braking energy of the motor 16 into thermal energy, one Inverter 31 with power transistors 32 controllable by the microcontroller 18 for generating a block-shaped supply voltage 20 or 34 for the motor 16.
  • the braking resistor 30 converts the electrical energy which was obtained from the conversion of the kinetic energy from the drum movement, into thermal energy.
  • the braking branch is switched on automatically, for example by detecting an intermediate circuit voltage 29 above a predetermined limit, until the intermediate circuit voltage 29 falls below the predetermined limit again.
  • the intermediate circuit voltage 29 is connected in block form to the terminals of the motor 16, in such a way that the fundamental oscillations 33 of these block-shaped voltage signals 34 at the motor terminals result in a symmetrical, three-phase voltage signal.
  • the form of the inverter output signals is shown schematically in FIG. 4.
  • the converter has a switching frequency of 20 kHz, i.e. the period between two successive edges of the voltage blocks 34 is 50 ⁇ sec.
  • the converter noise is therefore inaudible and the motor noise is very low.
  • the output of the pulse generator 25 on the shaft 26 of the asynchronous motor 16 supplies a pulse chain 35 when the shaft rotates, which is evaluated by the microcontroller 18 in such a way that in the control program both the mechanical speed of the motor shaft 26 and the position of a fictitious point on the motor shaft 26 are available, so that the speed of the drum 15 and the position and size of a possible imbalance on the drum 15 can be detected.
  • active unbalance compensation is used when the drum (rotor) 15 driven by the motor 16 is to be accelerated into the spin operation.
  • the microcontroller 18 differentiates two different phases, namely the detection phase and the compensation phase.
  • the drum 15 is accelerated, so that when driving with a constant torque, the minimum speed of the drum is approximately 70 rpm. It is important that the drive is controlled so that there is a constant drive torque.
  • control variables are first generated which generate an engine torque which is independent of the speed and the load.
  • the encoder signals 35 generated by the encoder 25 are evaluated, each edge of the pulse-shaped signals 35 incrementing a counter in the microcontroller 18. The evaluation of the engine speed is used to determine the size and position of the unbalance. After a cyclically steady operating state is reached with constant drive torque and the minimum speed, the difference between the maximum and minimum drum speed is used to measure the size of the unbalance.
  • the position of the unbalance is detected with the aid of the speed curve and always tracked by the counter so that the position of the unbalance is always available in the control program.
  • the change in the counter reading is examined for a specific evaluation cycle, ie for a specific period of time.
  • the change in the counter reading per time period corresponds to the number of possible pulses per Rotor rotation of the change in the position of a fictitious point on the rotor, for example the unbalance.
  • the compensation phase follows. From a certain drum speed, 18 control variables are generated in the microcontroller, which generate a torque on the motor shaft that corresponds to the torque required for medium acceleration plus a torque required for compensation.
  • the torque required for compensation depends on the unbalance mass and the unbalance position, and the control variables required for this purpose are stored in a characteristic field as a calculation variable in the ROM memory 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Ac Motors In General (AREA)
  • Testing Of Balance (AREA)
EP93200732A 1992-03-20 1993-03-12 Procédé pour la détection et la compensation d'un balourd d'un rotor entrainé par un moteur Ceased EP0565157A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208989 1992-03-20
DE4208989A DE4208989A1 (de) 1992-03-20 1992-03-20 Verfahren zur detektion und kompensation einer unwucht bei einem durch einen motor angetriebenen rotor

Publications (1)

Publication Number Publication Date
EP0565157A1 true EP0565157A1 (fr) 1993-10-13

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ID=6454548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200732A Ceased EP0565157A1 (fr) 1992-03-20 1993-03-12 Procédé pour la détection et la compensation d'un balourd d'un rotor entrainé par un moteur

Country Status (3)

Country Link
EP (1) EP0565157A1 (fr)
JP (1) JPH0611405A (fr)
DE (1) DE4208989A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0792963A2 (fr) * 1996-02-27 1997-09-03 SANYO ELECTRIC Co., Ltd. Essoreuse
US5775066A (en) * 1994-10-06 1998-07-07 Bart Lamaire Device for the distribution of bulk articles and use of such a device
EP1048774A2 (fr) * 1999-04-22 2000-11-02 BSH Bosch und Siemens Hausgeräte GmbH Procédé et dispositif pour détecter le balourd d'un rotor entrainé par un moteur électrique sans balais
WO2006072907A1 (fr) * 2005-01-04 2006-07-13 Arcelik Anonim Sirketi Machine a laver/secher
DE102018132769A1 (de) * 2018-12-19 2020-06-25 Miele & Cie. Kg Haushaltsgerät
CN116575216A (zh) * 2023-07-13 2023-08-11 珠海格力电器股份有限公司 一种洗衣机负载称重方法及洗衣机

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431846C2 (de) * 1994-09-07 2001-02-15 Diehl Ako Stiftung Gmbh & Co Verfahren zum beladungsabhängigen Steuern und/oder Regeln einer Waschmaschine oder eines Wäschetrockners
JP3030228B2 (ja) * 1995-04-14 2000-04-10 三洋電機株式会社 遠心脱水装置
DE19735313B4 (de) * 1997-08-14 2008-02-07 Bayerische Motoren Werke Ag Verfahren zur Ermittlung von geschwindigkeitsunabhängigen Frequenzen eines Nutzsignalanteils
DE19804079B4 (de) * 1998-02-03 2011-02-24 Electrolux Rothenburg Gmbh Factory And Development Verfahren zur Ermittlung einer Umverteilung und damit einer Änderung einer Unwucht von in eine drehbar antreibbare Trommel eingebrachten Gegenständen
DE10000235B4 (de) * 2000-01-05 2005-09-22 Snap-On Equipment Gmbh Vorrichtung zum Messen einer Rotorunwucht
DE10234053C1 (de) * 2002-07-26 2003-11-20 Diehl Ako Stiftung Gmbh & Co Verfahren zum Bestimmen der Unwucht einer Wäschetrommel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311883A1 (fr) * 1975-05-22 1976-12-17 Philips Nv Procede et machine pour laver et essorer le linge
US4765161A (en) * 1987-10-19 1988-08-23 American Laundry Machinery, Inc. Out-of-balance control for laundry machines
FR2630137A1 (fr) * 1988-04-14 1989-10-20 Licentia Gmbh Procede de mesure de la repartition du linge, notamment dans des machines a laver et des essoreuses
EP0394177A2 (fr) * 1989-04-17 1990-10-24 Emerson Electric Co. Procédé et dispositif de détection de balourd pour appareil ménager
EP0349798B1 (fr) * 1988-07-07 1992-09-02 Miele & Cie. GmbH & Co. Procédé pour commander l'essorage dans une machine à laver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311883A1 (fr) * 1975-05-22 1976-12-17 Philips Nv Procede et machine pour laver et essorer le linge
US4765161A (en) * 1987-10-19 1988-08-23 American Laundry Machinery, Inc. Out-of-balance control for laundry machines
FR2630137A1 (fr) * 1988-04-14 1989-10-20 Licentia Gmbh Procede de mesure de la repartition du linge, notamment dans des machines a laver et des essoreuses
EP0349798B1 (fr) * 1988-07-07 1992-09-02 Miele & Cie. GmbH & Co. Procédé pour commander l'essorage dans une machine à laver
EP0394177A2 (fr) * 1989-04-17 1990-10-24 Emerson Electric Co. Procédé et dispositif de détection de balourd pour appareil ménager

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5775066A (en) * 1994-10-06 1998-07-07 Bart Lamaire Device for the distribution of bulk articles and use of such a device
EP0792963A2 (fr) * 1996-02-27 1997-09-03 SANYO ELECTRIC Co., Ltd. Essoreuse
EP0792963A3 (fr) * 1996-02-27 1998-09-30 SANYO ELECTRIC Co., Ltd. Essoreuse
EP1048774A2 (fr) * 1999-04-22 2000-11-02 BSH Bosch und Siemens Hausgeräte GmbH Procédé et dispositif pour détecter le balourd d'un rotor entrainé par un moteur électrique sans balais
EP1048774A3 (fr) * 1999-04-22 2001-02-07 BSH Bosch und Siemens Hausgeräte GmbH Procédé et dispositif pour détecter le balourd d'un rotor entrainé par un moteur électrique sans balais
WO2006072907A1 (fr) * 2005-01-04 2006-07-13 Arcelik Anonim Sirketi Machine a laver/secher
DE102018132769A1 (de) * 2018-12-19 2020-06-25 Miele & Cie. Kg Haushaltsgerät
CN116575216A (zh) * 2023-07-13 2023-08-11 珠海格力电器股份有限公司 一种洗衣机负载称重方法及洗衣机
CN116575216B (zh) * 2023-07-13 2023-09-05 珠海格力电器股份有限公司 一种洗衣机负载称重方法及洗衣机

Also Published As

Publication number Publication date
DE4208989A1 (de) 1993-09-23
JPH0611405A (ja) 1994-01-21

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