EP2519671A1 - A washing machine the washing effectiveness of which is increased - Google Patents

A washing machine the washing effectiveness of which is increased

Info

Publication number
EP2519671A1
EP2519671A1 EP10794995A EP10794995A EP2519671A1 EP 2519671 A1 EP2519671 A1 EP 2519671A1 EP 10794995 A EP10794995 A EP 10794995A EP 10794995 A EP10794995 A EP 10794995A EP 2519671 A1 EP2519671 A1 EP 2519671A1
Authority
EP
European Patent Office
Prior art keywords
motor
temperature
washing
control unit
washing machine
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
EP10794995A
Other languages
German (de)
French (fr)
Other versions
EP2519671B1 (en
Inventor
Cagatay Buyuktopcu
Erkan Ozturk
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP2519671A1 publication Critical patent/EP2519671A1/en
Application granted granted Critical
Publication of EP2519671B1 publication Critical patent/EP2519671B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for

Definitions

  • the present invention relates to a washing machine the washing
  • the motor rotates clockwise and/or counterclockwise at the speed suitable for the washing program and provides the balanced distribution of laundry in the drum.
  • the motor rotates at high speed and generally in one direction.
  • the motors are designed to be powerful enough to generally rotate faster to the direction rotated in the spin-drying step than in the other direction.
  • the motor performs asymmetrical rotational movements by being rotated for a longer time opposite to the spin-drying direction and for a shorter time in the spin-drying direction.
  • the consumption of less energy is aimed since the motor rotates in the powerless direction for a longer time during washing wherein the motor draws less current.
  • the motor is targeted to be heated less in the asymmetrical rotational movements wherein the motor is provided to be rotated less in the powerless direction wherein the motor draws less current.
  • the motor also heats up by drawing more current and is strained when a lot of laundry or water absorbing cotton items are loaded in the tub.
  • the asymmetrical washing movement as well as contributing positively to heating of the motor also has negative effects on the washing effectiveness. The laundry cannot be cleaned effectively in washing machines that perform the washing by asymmetrical washing movements.
  • the aim of the present invention is the realization of a washing machine the washing effectiveness of which is increased.
  • the washing machine realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit that controls the rotational revolution and operation of the motor which provides the drum to be rotated clockwise and/or counterclockwise.
  • the control unit regulates the rotational movement of the motor in accordance with the data received from a sensor that detects the temperature of the motor.
  • the control unit provides the drum to be rotated by means of asymmetrical rotational movements such that the rotation time in the first direction wherein the motor draws more current and the rotation time in the second direction wherein less current is drawn than the first direction are equal.
  • the control unit provides the motor to rotate for a longer time in the second direction and thus provides the motor to perform asymmetrical rotational
  • control unit detects the temperature by means of the current drawn by the motor.
  • the amounts of current drawn by the motor in both directions of rotation are calculated and if the difference is more than a certain value then the time rotated in the second direction is decreased and the washing movement ratio is changed. Thus, the motor is prevented from overheating.
  • control unit In another embodiment of the present invention, the control unit
  • the motor temperature is detected by a sensor.
  • the sensor can be a thermal camera or a
  • thermometer in different embodiments of the present invention.
  • control unit if the control unit detects that the temperature falls below a limit temperature value while the motor performs asymmetrical rotational movement, the control unit provides the motor to perform symmetrical rotational movement. [0010] By means of the control unit of the present invention, washing
  • Figure 1 - is the perspective view of a washing machine.
  • the washing machine (1 ) of the present invention comprises a drum (2) wherein the laundry to be washed is placed, a motor (3) providing the drum (2) to rotate in the rotational speed suitable for the washing program that consists of main washing, rinsing and spin-drying steps and a control unit (4) that controls the operation of the motor (3) with respect to the washing program selected by the user ( Figure 1 ).
  • the control unit (4) provides the motor (3) to rotate clockwise and/or
  • the motor (3) generally rotates successively clockwise for a time period (t1) and counterclockwise for a time period (t1 ) in the washing step and provides the laundry to be agitated and cleaned in the drum (2).
  • the motor (3) In the spin-drying step, the motor (3) generally rotates at high speeds toward only one direction since the spinning process is performed by rotating at high speed.
  • the motor (3) is designed to draw more current (11) in the spin-drying direction since the motor (3) rotates at a much higher speed in the spin-drying step than in the washing step.
  • the motor (3) can heat up in the course of time in the first direction (d1 ) wherein the motor (3) draws more current (11 ).
  • the motor (3) can also heat up when a lot of items are loaded in the drum (2) or when there is unbalanced load distribution in the drum (2).
  • the symmetrical rotational movements provide the laundry to be cleaned more effectively.
  • the control unit (4) controls the motor (3) temperature (T) continuously or at certain intervals and compares the motor (3) temperature (T) with the limit temperature value (Tlim) recorded in the memory thereof.
  • the control unit (4) provides the motor (3) to perform symmetrical rotational movements as long as the motor (3) temperature (T) does not exceed the limit temperature value (Tlim).
  • the motor (3) temperature (T) can exceed the limit temperature value (Tlim) due to the reasons that the washing program being long, the motor (3) drawing more current (11) by rotating in the first direction (d1 ) for a long time (t1 ) or the drum (2) being loaded with too much or unbalanced load.
  • the control unit (4) provides the motor (3) to rotate successively for a time (t1 ) to the first direction (d1 ) and for a time (t2) to the second direction (d2) for unequal time periods (t2>t1 ).
  • the motor (3) rotates towards the first direction (d1) for a shorter time (t1 ) and overheating thereof is prevented.
  • the motor (3) cools down some amount since the motor (3) draws less current while rotating in the second direction (d2). Consequently, the washing machine (1 ) is provided to have longer life by preventing the motor (3) temperature (T) from exceeding the limit temperature value (Tlim) and avoiding damages.
  • control unit (4) detects that the motor (3) is starting to heat up when the difference of the current ( ⁇ ) drawn by the motor (3) increases.
  • the control unit (4) decides whether or not the motor (3) temperature (T) exceeds the limit temperature (Tlim) value by using the detected current difference ( ⁇ ) and the limit difference (Allim) and temperature (T) ratios recorded in the memory thereof.
  • the ratio of the motor (3) resistance to the motor (3) temperature (T) is recorded in the memory of the control unit (4).
  • the control unit (4) calculates the instantaneous resistance of the motor (3) by measuring the instantaneous voltage on the motor (3) and the instantaneous current drawn by the motor (3) and determines the instantaneous temperature (T) of the motor (3) by using the resistance and temperature ratio recorded in the memory thereof.
  • the motor (3) temperature (T) and resistance are proportional.
  • the resistance of the motor (3) at room temperature prior to operation is recorded in the memory of the control unit (4) by the producer.
  • the motor (3) temperature (T) is detected by comparing the calculated resistance with the motor (3) resistance at room temperature recorded in the memory of the control unit (4).
  • the washing machine (1 ) comprises a sensor (5) that detects the motor (3) temperature (T).
  • the sensor (5) is for example a thermal camera or a thermometer.
  • the motor (3) cools down when the motor (3) starts rotating towards the second direction (d2).
  • T temperature
  • the laundry is provided to be cleaned in a shorter period of time. Consequently, washing programs that take less time can be used than the washing programs wherein

Landscapes

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

Abstract

The washing machine (1) of the present invention comprises a drum (2) wherein the laundry to be washed is placed, a motor (3) providing the drum (2) to rotate in the rotational speed suitable for the washing program consisting of main washing, rinsing and spin-drying steps and a control unit (4) that controls operation of the motor (3) with respect to the washing program selected by the user.

Description

Description
A WASHING MACHINE THE WASHING EFFECTIVENESS OF WHICH IS
INCREASED
[0001] The present invention relates to a washing machine the washing
effectiveness of which is increased.
[0002] In washing machines, in the steps of washing, rinsing and spin-drying of the laundry placed in the drum, the motor rotates clockwise and/or counterclockwise at the speed suitable for the washing program and provides the balanced distribution of laundry in the drum. In the spin-drying step, the motor rotates at high speed and generally in one direction.
Therefore, the motors are designed to be powerful enough to generally rotate faster to the direction rotated in the spin-drying step than in the other direction. In the washing step, the motor performs asymmetrical rotational movements by being rotated for a longer time opposite to the spin-drying direction and for a shorter time in the spin-drying direction. Thus, the consumption of less energy is aimed since the motor rotates in the powerless direction for a longer time during washing wherein the motor draws less current. Moreover, the motor is targeted to be heated less in the asymmetrical rotational movements wherein the motor is provided to be rotated less in the powerless direction wherein the motor draws less current. The motor also heats up by drawing more current and is strained when a lot of laundry or water absorbing cotton items are loaded in the tub. However, the asymmetrical washing movement as well as contributing positively to heating of the motor also has negative effects on the washing effectiveness. The laundry cannot be cleaned effectively in washing machines that perform the washing by asymmetrical washing movements.
[0003] In the state of the art German Patent Document No. DE 10054947, the explanation is given for how the detergent is dissolved more quickly and energy is saved by means of rotational directions of the motor being asymmetrical.
[0004] The aim of the present invention is the realization of a washing machine the washing effectiveness of which is increased.
[0005] The washing machine realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a control unit that controls the rotational revolution and operation of the motor which provides the drum to be rotated clockwise and/or counterclockwise. The control unit regulates the rotational movement of the motor in accordance with the data received from a sensor that detects the temperature of the motor. The control unit provides the drum to be rotated by means of asymmetrical rotational movements such that the rotation time in the first direction wherein the motor draws more current and the rotation time in the second direction wherein less current is drawn than the first direction are equal. When the motor temperature is detected to exceed the limit temperature value, the control unit provides the motor to rotate for a longer time in the second direction and thus provides the motor to perform asymmetrical rotational
movements. Consequently, as long as the motor does not heat up, the drum is rotated symmetrically and the decrease in washing effectiveness is prevented.
[0006] In another embodiment of the present invention, the control unit detects the temperature by means of the current drawn by the motor. The amounts of current drawn by the motor in both directions of rotation are calculated and if the difference is more than a certain value then the time rotated in the second direction is decreased and the washing movement ratio is changed. Thus, the motor is prevented from overheating.
[0007] In another embodiment of the present invention, the control unit
determines the motor temperature from the instantaneous resistance calculated from the voltage of the motor and the drawn current, and the resistance temperature relationship recorded in the memory thereof.
[0008] In another embodiment of the present invention, the motor temperature is detected by a sensor. The sensor can be a thermal camera or a
thermometer in different embodiments of the present invention.
[0009] In an embodiment of the present invention, if the control unit detects that the temperature falls below a limit temperature value while the motor performs asymmetrical rotational movement, the control unit provides the motor to perform symmetrical rotational movement. [0010] By means of the control unit of the present invention, washing
effectiveness is increased by starting washing with symmetrical washing movement at the start of the washing step and afterwards changing to asymmetrical movements depending on the state of the motor
temperature. Consequently, as long as the motor does not heat up, asymmetrical washing movement is not performed unnecessarily and the user is provided to receive maximum performance from the washing machine.
[001 1] A washing machine realized in order to attain the aim of the present
invention is illustrated in the attached figures, where:
[0012] Figure 1 - is the perspective view of a washing machine.
[0013] The elements in the figures are numbered as follows:
1. Washing machine
2. Drum
3. Motor
4. Control unit
5. Sensor
[0014] The washing machine (1 ) of the present invention comprises a drum (2) wherein the laundry to be washed is placed, a motor (3) providing the drum (2) to rotate in the rotational speed suitable for the washing program that consists of main washing, rinsing and spin-drying steps and a control unit (4) that controls the operation of the motor (3) with respect to the washing program selected by the user (Figure 1 ).
[0015] The control unit (4) provides the motor (3) to rotate clockwise and/or
counterclockwise at the determined speeds in the washing program in accordance with the program selected by the user. The motor (3) generally rotates successively clockwise for a time period (t1) and counterclockwise for a time period (t1 ) in the washing step and provides the laundry to be agitated and cleaned in the drum (2). In the spin-drying step, the motor (3) generally rotates at high speeds toward only one direction since the spinning process is performed by rotating at high speed. The motor (3) is designed to draw more current (11) in the spin-drying direction since the motor (3) rotates at a much higher speed in the spin-drying step than in the washing step. The motor (3) can heat up in the course of time in the first direction (d1 ) wherein the motor (3) draws more current (11 ).
Moreover, the motor (3) can also heat up when a lot of items are loaded in the drum (2) or when there is unbalanced load distribution in the drum (2).
[0016] In the washing step, the control unit (4),
- detects the temperature (T) of the motor (3),
- provides the motor (3) to perform symmetrical rotational movements such that the rotation time (t1) of the motor (3) in the first direction (d 1 ) is equal to the rotation time (t2) of the motor (3) in the second direction (d2) if the temperature (T) of the motor (3) is below a limit temperature (Tlim) value recorded in the memory thereof and
- provides the motor (3) to perform asymmetrical rotational movements such that the rotation time (t1) of the motor (3) in the first direction (d 1 ) is less than the rotation time (t2) of the motor (3) in the second direction (d2) if the temperature (T) of the motor (3) exceeds the limit temperature (Tlim) value recorded in the memory thereof.
[0017] At the start of the washing program, the motor (3) performs symmetrical rotational movements by successively rotating in equal time periods (t1 =t2), for a time (t1 ) in the first direction (d1 ) and for a time (t2) in the second direction (d2). The symmetrical rotational movements provide the laundry to be cleaned more effectively. The control unit (4) controls the motor (3) temperature (T) continuously or at certain intervals and compares the motor (3) temperature (T) with the limit temperature value (Tlim) recorded in the memory thereof. The control unit (4) provides the motor (3) to perform symmetrical rotational movements as long as the motor (3) temperature (T) does not exceed the limit temperature value (Tlim). The motor (3) temperature (T) can exceed the limit temperature value (Tlim) due to the reasons that the washing program being long, the motor (3) drawing more current (11) by rotating in the first direction (d1 ) for a long time (t1 ) or the drum (2) being loaded with too much or unbalanced load. In this situation, the control unit (4) provides the motor (3) to rotate successively for a time (t1 ) to the first direction (d1 ) and for a time (t2) to the second direction (d2) for unequal time periods (t2>t1 ). Thus, after heating up, the motor (3) rotates towards the first direction (d1) for a shorter time (t1 ) and overheating thereof is prevented. The motor (3) cools down some amount since the motor (3) draws less current while rotating in the second direction (d2). Consequently, the washing machine (1 ) is provided to have longer life by preventing the motor (3) temperature (T) from exceeding the limit temperature value (Tlim) and avoiding damages.
[0018] In an embodiment of the present invention, the control unit (4)
instantaneously compares the current (11 ) drawn by motor (3) while rotating to the first direction (d1 ) and the current (I2) drawn by motor (3) while rotating to the second direction (d2) and when the difference (ΔΙ) between the currents (11 and I2) exceeds a limit difference (Allim) value recorded in the memory thereof, decides that the motor (3) is starting to heat up. As long as the load in the drum (2) is balanced, the currents (11 , I2) drawn by the motor (3) while rotating in both directions (d1 , d2) are almost constant. In the course of time, the current drawn (11 or I2) by the motor (3) while rotating in one direction (d1 or d2) increases, for example, when the load in the drum (2) becomes unbalanced. In this situation, the control unit (4) detects that the motor (3) is starting to heat up when the difference of the current (ΔΙ) drawn by the motor (3) increases. The control unit (4) decides whether or not the motor (3) temperature (T) exceeds the limit temperature (Tlim) value by using the detected current difference (ΔΙ) and the limit difference (Allim) and temperature (T) ratios recorded in the memory thereof.
[0019] In another embodiment of the present invention, the ratio of the motor (3) resistance to the motor (3) temperature (T) is recorded in the memory of the control unit (4). The control unit (4) calculates the instantaneous resistance of the motor (3) by measuring the instantaneous voltage on the motor (3) and the instantaneous current drawn by the motor (3) and determines the instantaneous temperature (T) of the motor (3) by using the resistance and temperature ratio recorded in the memory thereof. The motor (3) temperature (T) and resistance are proportional. The resistance of the motor (3) at room temperature prior to operation is recorded in the memory of the control unit (4) by the producer. When the washing machine (1 ) starts operating, the resistance on the motor (3) and the current drawn is measured continuously and at certain intervals while the motor (3) performs symmetrical (t1 =t2) rotational movements and the instantaneous resistance of the motor (3) is calculated. The motor (3) temperature (T) is detected by comparing the calculated resistance with the motor (3) resistance at room temperature recorded in the memory of the control unit (4).
[0020] In another embodiment of the present invention, the washing machine (1 ) comprises a sensor (5) that detects the motor (3) temperature (T). The sensor (5) is for example a thermal camera or a thermometer.
[0021] In an embodiment of the present invention, the control unit (4) also detects the temperature (T) of the motor (3) after the motor (3) starts performing asymmetrical (t2>t1 ) rotational movement and if the motor (3) temperature (T) falls below the limit temperature (Tlim) value, provides the motor (3) to again perform symmetrical (t1 =t2) rotational movement. The motor (3) cools down when the motor (3) starts rotating towards the second direction (d2). The control unit (4) provides the motor (3) to perform symmetrical (t1 =t2) rotational movement after the motor (3) cools down and thus the decrease of washing effectiveness is prevented.
[0022] The washing effectiveness is increased by means of the control unit (4) controlling the motor (3) temperature (T) and providing the motor (3) to perform symmetrical (t1 =t2) rotational movement as long as the motor (3) does not exceed the limit temperature (Tlim). The laundry is provided to be cleaned in a shorter period of time. Consequently, washing programs that take less time can be used than the washing programs wherein
asymmetrical (t2>t1 ) washing is performed.
[0023] It is to be understood that the present invention is not limited to the
embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These different embodiments should also be considered within the scope of the claims of the present invention.

Claims

Claims
1. A washing machine (1 ) comprising a drum (2) wherein the laundry to be
washed is placed, a motor (3) that rotates for a time in the first direction (d1) where more current (I 1)is drawn and for a time in the second direction (d2) where less current (I2) is drawn in the rotational speed of the drum (2) suitable for the washing program that consists of main washing, rinsing and spin-drying steps, a control unit (4) that controls the operation of the motor (3) with respect to the washing program selected by the user, - characterized by the control unit (4), in the washing step, - that provides the temperature (T) of the motor (3) to be detected, - provides the motor (3) to perform symmetrical (t1 =t2) rotational movements such that the rotation time (t1) of the motor (3) in the first direction (d1 ) is equal to the rotation time (t2) of the motor (3) in the second direction (d2) if the temperature (T) of the motor (3) is below a limit
temperature (Tlim) value recorded in the memory thereof, and - provides the motor (3) to perform asymmetrical (t2>t1) rotational movements such that the rotation time (t1 ) of the motor (3) in the first direction (d1 ) is less than the rotation time (t2) of the motor (3) in the second direction (d2) if the motor (3) temperature (T) exceeds a limit temperature (Tlim) value recorded in the memory thereof.
2. A washing machine (1 ) as in Claim 1 , characterized by the control unit (4) that instantaneously compares the current (11) drawn by the motor (3) while rotating to the first direction (d1 ) and the current (I2) drawn by the motor (3) while rotating to the second direction (d2) and when the difference (ΔΙ) between the currents (11 and I2) exceeds a limit difference (Allim) value recorded in the memory thereof, decides that the motor (3) is starting to heat up.
3. A washing machine (1 ) as in Claim 1 , characterized by the control unit (4)
having the ratio of the motor (3) resistance to the motor (3) temperature (T) recorded in the memory thereof and that calculates the instantaneous resistance of the motor (3) by measuring the instantaneous voltage on the motor (3) and the instantaneous current drawn by the motor (3) and detects the instantaneous temperature (T) of the motor (3) by using the resistance and temperature ratio recorded in the memory thereof.
4. A washing machine (1 ) as in Claim 1 , characterized by a sensor (5) that detects the motor (3) temperature (T).
5. A washing machine (1 ) as in any one of the above Claims, characterized by the control unit (4) that controls the temperature (T) of the motor (3) after the motor (3) starts performing asymmetrical (t2>t1 ) rotational movement and if the motor (3) temperature (T) value falls below the limit temperature (Tlim) value, provides the motor (3) to again perform symmetrical (t1 =t2) rotational movement.
EP10794995.0A 2009-12-31 2010-12-17 A washing machine the washing effectiveness of which is increased Not-in-force EP2519671B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200910089 2009-12-31
PCT/EP2010/070091 WO2011080123A1 (en) 2009-12-31 2010-12-17 A washing machine the washing effectiveness of which is increased

Publications (2)

Publication Number Publication Date
EP2519671A1 true EP2519671A1 (en) 2012-11-07
EP2519671B1 EP2519671B1 (en) 2014-04-16

Family

ID=43901288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10794995.0A Not-in-force EP2519671B1 (en) 2009-12-31 2010-12-17 A washing machine the washing effectiveness of which is increased

Country Status (2)

Country Link
EP (1) EP2519671B1 (en)
WO (1) WO2011080123A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04285589A (en) * 1991-03-14 1992-10-09 Sanyo Electric Co Ltd Drum type washing machine
DE4310595A1 (en) * 1993-03-31 1994-10-06 Bosch Siemens Hausgeraete Washing machine with a reversing laundry drum
JP2000061191A (en) * 1998-08-20 2000-02-29 Nippon Kentetsu Co Ltd Washing machine
DE10054947A1 (en) 2000-11-06 2002-05-08 Bsh Bosch Siemens Hausgeraete Treatment of laundry in washing machine with rotationally located washing drum in which laundry is received and liquid during washing method flows through washing drum in laundry or washing and out from it and drum in operation of machine
US20080295543A1 (en) * 2007-06-01 2008-12-04 Justin Brubaker Washing machine apparatus and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011080123A1 *

Also Published As

Publication number Publication date
WO2011080123A1 (en) 2011-07-07
EP2519671B1 (en) 2014-04-16

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