EP1950337B1 - Electric household appliance - Google Patents

Electric household appliance Download PDF

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Publication number
EP1950337B1
EP1950337B1 EP07101137A EP07101137A EP1950337B1 EP 1950337 B1 EP1950337 B1 EP 1950337B1 EP 07101137 A EP07101137 A EP 07101137A EP 07101137 A EP07101137 A EP 07101137A EP 1950337 B1 EP1950337 B1 EP 1950337B1
Authority
EP
European Patent Office
Prior art keywords
electric
household appliance
electric household
outer casing
drum
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.)
Active
Application number
EP07101137A
Other languages
German (de)
French (fr)
Other versions
EP1950337A1 (en
Inventor
Stefano Casagrande
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp 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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to PL07101137T priority Critical patent/PL1950337T3/en
Priority to EP07101137A priority patent/EP1950337B1/en
Priority to AT07101137T priority patent/ATE530696T1/en
Priority to ES07101137T priority patent/ES2376483T3/en
Priority to RU2008102832/12A priority patent/RU2451119C2/en
Publication of EP1950337A1 publication Critical patent/EP1950337A1/en
Application granted granted Critical
Publication of EP1950337B1 publication Critical patent/EP1950337B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 

Definitions

  • the present invention relates to an electric household appliance.
  • the present invention relates to an electric household appliance preferably corresponding to a washing machine comprising an electric protection circuit connecting parts of the appliance to a substantially zero reference potential; to which the following description refers purely by way of example.
  • washing machines have an outer casing in which is fitted a laundry wash assembly normally comprising a wash tub; a wash drum mounted inside the wash tub to rotate freely about a predetermined axis of rotation; a pulley fitted to the shaft rotating the wash drum; and an electric motor driven by an electric board and connected by a drive belt to the pulley to rotate the wash drum about the axis of rotation.
  • the above washing machines are also known to comprise an electric protection circuit connecting the outer casing of the washing machine and the outer frame of the electric motor electrically to an electric ground system, which, as is known, has a conveniently zero reference potential.
  • JP 09 131494 discloses a motor covered with a mold resin that is installed on the outer bottom of an outer drum via a motor mount.
  • An anchor bolt is inserted and fixed through a location hole of a stator core of the motor, and an earth connecting plate is fixed by the bolt as well.
  • An earthing line is connected to the plate. The line is earthed via the mount.
  • the electric protection circuit performs at least two functions: firstly, it provides for discharging to the ground system the electrostatic charges accumulating on the electric motor frame as a result of the drive belt rubbing on the motor shaft as the shaft rotates, thus preventing electrostatic discharges on the sensitive circuit parts of the electric motor and/or on the electric control board; and, secondly, it provides for discharging to the ground system any electric noise produced by switching of the brushes on the commutator of the electric motor.
  • the above electric protection circuit is also known to normally comprise a low-pass filter connected between the outer casing of the washing machine and the ground system to filter the high-frequency components from the electric signals circulating in the protection circuit before they reach the ground system.
  • an electric household appliance as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1.
  • Number 1 in the attached drawing indicates as a whole an electric household appliance preferably corresponding to a washing machine comprising an outer casing 2 made of metal and in which is fitted a laundry wash assembly 3, which comprises a wash tub 4 connected appropriately to outer casing 2, and a wash drum 5 mounted inside wash tub 4 to rotate freely about an axis of rotation A.
  • Washing machine 1 also comprises a pulley 6 fitted to the shaft 7 rotating wash drum 5; and an electric motor 8 driven by an electric board (not shown) and connected by a drive belt 9 to pulley 6 to rotate wash drum 5.
  • Washing machine 1 also comprises an electric protection circuit 10 electrically connecting outer casing 2 of the washing machine and the outer frame 11 of electric motor 8 to an electric ground system 12 at zero reference potential.
  • Electric protection circuit 10 substantially comprises a passive electrical device 13 having a first terminal 14 connected to outer frame 11 of electric motor 8, and a second terminal 15 connected to outer casing 2 of the washing machine. Electric protection circuit 10 also comprises an electric conductor connecting second terminal 15 of the passive electrical device 13 to electric ground system 12.
  • the passive electrical device 13 comprises a resistor or an inductor having an impedance which ranges between 470*10 3 and 10 7 ohms. Tests show that a resistor or an inductor having an impedance approximately 10 6 ohms provides for effectively grounding the electrostatic charges accumulated by electric motor 8, while at the same time providing electric protection circuit 10 with sufficient impedance to reduce the high-frequency noise generated by electric motor 8.
  • the electric household appliance described above is extremely advantageous, in that the resistor or the inductor is an electric component extremely cheap, ensures electrostatic charge flow to the ground system, and at the same time has an extremely high electric circuit impedance at high frequencies, capable of suppressing the high-frequency noise generated by the electric motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Food-Manufacturing Devices (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Elimination Of Static Electricity (AREA)

Abstract

There is described a electric household appliance (1) having an outer casing (2); a laundry drum (5) housed inside the outer casing (2) and rotating about a predetermined axis (A) of rotation; and an electric motor (8) having an outer frame (11) and for rotating the drum (5) about the axis (A) of rotation; the electric household appliance (1) has an electric protection circuit (10), which in turn has a resistor or an inductor (13) having a first terminal (14) connected to the outer frame (11) of the electric motor (8), and a second terminal (15) connected to the outer casing (2) of the electric household appliance (1).

Description

  • The present invention relates to an electric household appliance.
  • More specifically, the present invention relates to an electric household appliance preferably corresponding to a washing machine comprising an electric protection circuit connecting parts of the appliance to a substantially zero reference potential; to which the following description refers purely by way of example.
  • As is known, currently marketed washing machines have an outer casing in which is fitted a laundry wash assembly normally comprising a wash tub; a wash drum mounted inside the wash tub to rotate freely about a predetermined axis of rotation; a pulley fitted to the shaft rotating the wash drum; and an electric motor driven by an electric board and connected by a drive belt to the pulley to rotate the wash drum about the axis of rotation.
  • The above washing machines are also known to comprise an electric protection circuit connecting the outer casing of the washing machine and the outer frame of the electric motor electrically to an electric ground system, which, as is known, has a conveniently zero reference potential.
  • JP 09 131494 discloses a motor covered with a mold resin that is installed on the outer bottom of an outer drum via a motor mount. An anchor bolt is inserted and fixed through a location hole of a stator core of the motor, and an earth connecting plate is fixed by the bolt as well. An earthing line is connected to the plate. The line is earthed via the mount.
  • More specifically, in washing machines of the type described above, the electric protection circuit performs at least two functions: firstly, it provides for discharging to the ground system the electrostatic charges accumulating on the electric motor frame as a result of the drive belt rubbing on the motor shaft as the shaft rotates, thus preventing electrostatic discharges on the sensitive circuit parts of the electric motor and/or on the electric control board; and, secondly, it provides for discharging to the ground system any electric noise produced by switching of the brushes on the commutator of the electric motor.
  • To prevent conduction of high-frequency electric noise to the ground system, as required by current standards, the above electric protection circuit is also known to normally comprise a low-pass filter connected between the outer casing of the washing machine and the ground system to filter the high-frequency components from the electric signals circulating in the protection circuit before they reach the ground system.
  • Though efficient, the presence of the filter in the electric protection circuit has the drawback of greatly increasing the manufacturing cost of the circuit.
  • It is an object of the present invention to provide an electric household appliance featuring a highly straightforward, low-cost electric protection circuit designed to discharge to the ground system the electrostatic charges accumulated by various component parts of the washing machine, and at the same time to reduce high-frequency noise produced by various electric components of the appliance and supplied to the ground system.
  • According to the present invention, there is provided an electric household appliance as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1.
  • The present invention will be described with reference to the attached drawing, which shows a nonlimiting embodiment of an electric household appliance featuring an electric protection circuit in accordance with the teachings of the present invention.
  • Number 1 in the attached drawing indicates as a whole an electric household appliance preferably corresponding to a washing machine comprising an outer casing 2 made of metal and in which is fitted a laundry wash assembly 3, which comprises a wash tub 4 connected appropriately to outer casing 2, and a wash drum 5 mounted inside wash tub 4 to rotate freely about an axis of rotation A.
  • Washing machine 1 also comprises a pulley 6 fitted to the shaft 7 rotating wash drum 5; and an electric motor 8 driven by an electric board (not shown) and connected by a drive belt 9 to pulley 6 to rotate wash drum 5.
  • Washing machine 1 also comprises an electric protection circuit 10 electrically connecting outer casing 2 of the washing machine and the outer frame 11 of electric motor 8 to an electric ground system 12 at zero reference potential.
  • Electric protection circuit 10 substantially comprises a passive electrical device 13 having a first terminal 14 connected to outer frame 11 of electric motor 8, and a second terminal 15 connected to outer casing 2 of the washing machine. Electric protection circuit 10 also comprises an electric conductor connecting second terminal 15 of the passive electrical device 13 to electric ground system 12.
  • The passive electrical device 13 comprises a resistor or an inductor having an impedance which ranges between 470*103 and 107 ohms. Tests show that a resistor or an inductor having an impedance approximately 106 ohms provides for effectively grounding the electrostatic charges accumulated by electric motor 8, while at the same time providing electric protection circuit 10 with sufficient impedance to reduce the high-frequency noise generated by electric motor 8.
  • The electric household appliance described above is extremely advantageous, in that the resistor or the inductor is an electric component extremely cheap, ensures electrostatic charge flow to the ground system, and at the same time has an extremely high electric circuit impedance at high frequencies, capable of suppressing the high-frequency noise generated by the electric motor.
  • Clearly, changes may be made to the electric household appliance as described and illustrated herein without, however, departing from the scope of the present invention as defined in the accompanying Claims.

Claims (5)

  1. An electric household appliance (1) comprising an outer casing (2); a laundry drum (5) housed inside said outer casing (2) and rotating about a predetermined axis (A) of rotation; an electric motor (8) having an outer frame (11) and for rotating said drum (5) about said axis (A) of rotation; and an electric protection circuit (10), in turn comprising at least one resistor or at least one inductor (13) having a first terminal (14) connected to the outer frame (11) of said electric motor (8), and a second terminal (15) connected to said outer casing (2) of the electric household appliance (1), characterized in that said resistor or said inductor (13) has an impedance ranging between approximately 470*103 and 107 ohms.
  2. An electric household appliance as claimed in Claim 1, wherein said resistor or said inductor (13) has a impedance of approximately 106 ohms.
  3. An electric household appliance as claimed in any one of the foregoing Claims, wherein said second terminal (15) of said resistor or said inductor (13) is connected to an electric ground system (12) at zero electric potential.
  4. An electric household appliance as claimed in any one of the foregoing Claims and corresponding to a washing machine.
  5. An electric household appliance as claimed in Claim 5, wherein said drum (5) corresponds to a wash drum having a shaft (7) fitted with a pulley (6) connected to said electric motor (8) by a drive belt (9).
EP07101137A 2007-01-25 2007-01-25 Electric household appliance Active EP1950337B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PL07101137T PL1950337T3 (en) 2007-01-25 2007-01-25 Electric household appliance
EP07101137A EP1950337B1 (en) 2007-01-25 2007-01-25 Electric household appliance
AT07101137T ATE530696T1 (en) 2007-01-25 2007-01-25 HOUSEHOLD ELECTRICAL APPLIANCE
ES07101137T ES2376483T3 (en) 2007-01-25 2007-01-25 APPLIANCES.
RU2008102832/12A RU2451119C2 (en) 2007-01-25 2008-01-24 Domestic electrical appliance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07101137A EP1950337B1 (en) 2007-01-25 2007-01-25 Electric household appliance

Publications (2)

Publication Number Publication Date
EP1950337A1 EP1950337A1 (en) 2008-07-30
EP1950337B1 true EP1950337B1 (en) 2011-10-26

Family

ID=38157945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07101137A Active EP1950337B1 (en) 2007-01-25 2007-01-25 Electric household appliance

Country Status (5)

Country Link
EP (1) EP1950337B1 (en)
AT (1) ATE530696T1 (en)
ES (1) ES2376483T3 (en)
PL (1) PL1950337T3 (en)
RU (1) RU2451119C2 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB650601A (en) * 1948-10-11 1951-02-28 Robertshaw Fulton Controls Co Improvements in or relating to control devices responsive to physical conditions andembodying conjointly operated electric switches
RU2006084C1 (en) * 1992-04-09 1994-01-15 Центральный научно-исследовательский институт "Дельфин" Inductance coil
JPH09131494A (en) * 1995-11-09 1997-05-20 Toshiba Corp Washing machine
DE19809224A1 (en) * 1998-03-04 1999-09-09 Bosch Siemens Hausgeraete Home appliance

Also Published As

Publication number Publication date
EP1950337A1 (en) 2008-07-30
ES2376483T3 (en) 2012-03-14
RU2451119C2 (en) 2012-05-20
ATE530696T1 (en) 2011-11-15
PL1950337T3 (en) 2012-03-30
RU2008102832A (en) 2009-07-27

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