US20070113598A1 - Induction motor for drum washing machine and drum washing machine using same - Google Patents

Induction motor for drum washing machine and drum washing machine using same Download PDF

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Publication number
US20070113598A1
US20070113598A1 US11/599,436 US59943606A US2007113598A1 US 20070113598 A1 US20070113598 A1 US 20070113598A1 US 59943606 A US59943606 A US 59943606A US 2007113598 A1 US2007113598 A1 US 2007113598A1
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US
United States
Prior art keywords
washing machine
rotor
drum washing
induction motor
teeth
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.)
Abandoned
Application number
US11/599,436
Other languages
English (en)
Inventor
Cha Jun
Byoung Min
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUN, CHA SEUNG, MIN, BYOUNG WOOK
Publication of US20070113598A1 publication Critical patent/US20070113598A1/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/165—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors characterised by the squirrel-cage or other short-circuited windings
    • 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 
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • 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
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew

Definitions

  • the present invention relates to a washing machine, more particularly, to an induction motor for a washing machine that can reduce vibration and noise as well as production cost.
  • drum washing machines may be classified as indirect drive drum washing machines and direct drive drum washing machines.
  • the former indirectly transmits a driving force of a motor to a drum via a motor pulley and a drum pulley, and the latter directly connects a rotor of a motor to a drum to transmit the driving force of the motor to the drum.
  • the indirect drive drum washing machine has a problem with energy loss and noise during the transmission of the driving force.
  • the direct drive drum washing machine recently has been more widely used.
  • the direct drive drum washing machine has a motor mounted to a rear wall of a tub to directly transmit the driving force of the motor to the drum.
  • a motor in the conventional direct drive drum washing machine includes a rotor connected to a shaft of a drum, a permanent magnet on the rotor, and a stator wound with a coil.
  • a conventional motor has a problem where it costs a lot to fabricate the motor and a washing machine, because the conventional motor needs an expensive permanent magnet.
  • the permanent magnet is installed around the circumference of the rotor with alternating magnetic poles along a circumferential direction of the rotor.
  • the permanent magnet interacts with space between teeth of the stator, that is, with a slot of the stator, such that cogging torque is generated.
  • a conventional motor with a permanent magnet has another problem where the efficiency may deteriorate due to mechanical vibration and torque ripple caused by frequency harmonics.
  • a hall sensor should be provided in the conventional motor with a permanent magnet to detect the position of the rotor. Also, an algorithm that determines the position of the rotor is necessary when the motor is operated. Also, the position of the rotor should be controlled according to the phase of supplied voltage. Thus, this results in another problem where the cost of motor is high and the control of motor is complex.
  • the present invention is directed to an induction motor for a drum washing machine and a washing machine using the same that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An advantage of the present invention is to provide an induction motor for a drum washing machine that reduces the production cost.
  • Another advantage of the present invention is to provide an induction motor for a drum washing machine and a drum washing machine that reduces vibration and noise.
  • an induction motor for a drum washing machine includes: a concentrated winding stator with a plurality of teeth that project from a circumference thereof and a coil wounded around each tooth; a rotor frame connected to a shaft directly fixed to a rotatable drum in the drum washing machine, wherein the concentrated winding type stator is located in the rotor frame; and a rotor conductor that generates induced currents in closed circuits along a circumferential direction of the rotor frame when electric currents are applied to the coils so that the rotor frame rotates, wherein the closed circuit is skewed.
  • a drum washing machine in another aspect of the present invention, includes: a tub that holds washing solution therein; a drum that rotates within the tub; a concentrated winding stator with a plurality of teeth that project from a circumference thereof and a coil wounded around each tooth, the concentrated winding stator fixed to a rear wall of the tub; a shaft directly connected to the drum, passing through the rear wall of the tub; a rotor frame directly connected to the shaft, wherein the concentrated winding type stator is located in the rotor frame; and a rotor conductor that generates induced currents in closed circuits along a circumferential direction of the rotor frame when electric currents are applied to the coils so that the rotor frame rotates, wherein the closed circuit is skewed
  • FIG. 1 is a diagram schematically illustrating a drum washing machine including an induction motor according to the present invention
  • FIG. 2 is a plan view of the induction motor according to the present invention.
  • FIG. 3 is a sectional view along the line I-I of the motor shown in FIG. 2 ;
  • FIG. 4 is a plan view partially illustrating a stator core of the induction motor shown in FIG. 3 ;
  • FIG. 5 is a front view illustrating another embodiment of a rotor conductor of the induction motor according to the present invention shown in FIG. 3 ;
  • FIG. 6 is a front view illustrating still another embodiment of the rotor conductor of the induction motor according to the present invention.
  • FIG. 7 is a block diagram illustrating a parallel wiring of the induction motor according to the present invention.
  • FIG. 1 is a diagram schematically illustrating a drum washing machine including an induction motor according to the present invention.
  • the drum washing machine includes a tub 2 provided within a cabinet 1 , a drum 3 rotatably installed within the tub 2 , a shaft 4 fixed to a rear wall of the drum 3 passing through a rear wall of the tub 2 , and a motor 100 provided at the rear of the tub 2 to operate the drum 3 .
  • the motor 100 is also connected to the shaft 4 .
  • a door 5 is coupled to a front of the cabinet 1 , and a gasket 6 is provided between the door 5 and the tub 2 .
  • the washing machine has a hanging spring 7 between an inner upper surface of the cabinet 1 and an upper surface of the tub 2 to suspend the tub 2 within the cabinet 1 .
  • a friction damper 8 is provided between a lower portion of the cabinet 1 and a lower outer surface of the tub 2 to attenuate vibration of the tub 2 generated by spinning the laundry.
  • the motor 100 may be a Brushless DC (BLDC) motor.
  • the motor 100 includes a stator 300 fixed to the rear wall 2 a of the tub 2 and a rotor 200 coupled to the shaft 4 to directly rotate the drum 3 .
  • the motor 100 of the present invention directly transmits its driving force to the drum 3 via the shaft 4 directly connected to the drum 3 and the rotor 200 and not via an auxiliary pulley or belt in the prior art.
  • FIG. 2 is a plan view of the induction motor according to the present invention
  • FIG. 3 is a sectional view along the line I-I of the motor shown in FIG. 2
  • FIG. 4 is a plan view partially illustrating a stator core of the induction motor shown in FIG. 3 .
  • the stator 300 includes a stator core 310 and an insulator 320 .
  • Thin conductor plates are stacked or a long and thin conductor band is wound in a spiral shape to form a multi-layered stator core 310 .
  • the insulator 320 is attached to an upper surface and a lower surface of the stator core 310 .
  • An opening 330 is formed in the center of the stator 300 to allow the shaft 4 to pass through the stator 300 , and a plurality of fastening holes 340 are formed along a circumference of the opening 330 .
  • the stator 300 is secured to the rear wall 2 a of the tub 2 by a fastener such as a bolt and the fastening hole 340 .
  • a plurality of teeth 301 project from the circumference of the stator 300 in a radial direction.
  • the pitch of the teeth is the distance between the centers of adjacent teeth and is illustrated as “p” in FIG. 4 .
  • a pole shoe 302 at the end of the tooth 301 has two opposite ends that project in a circumferential direction relative to the stator 300 to partially cover a slot 303 that is a space between the teeth 301 .
  • the middle portion of the pole shoe 302 is thicker than the two opposite ends of the pole shoe 302 .
  • a coil 350 is wound around each tooth 301 , and it is preferred that the coil 350 is a concentrated winding. That is, the coil 350 is wound around each tooth 301 of the stator 300 so that the number of slots corresponding to each pole, formed when electrical power is applied to the coil 350 wound around the each tooth, is 1 or less than 1.
  • the stator core 310 having a small number of the teeth 301 is used, a lot of magnetic poles may be formed.
  • the stator 300 may be small in size, compared to a dispersed winding. Also, it is easier to control the motor using an inverter due to the increased number of the magnetic poles.
  • the rotor 200 surrounds the stator 300 .
  • the rotor 200 includes a rotor frame 210 that has a cup shape.
  • the shaft 4 is fixed to a rear wall of the rotor frame 210 , and a side wall of the rotor frame 210 encompasses the stator 300 .
  • the motor 100 for a drum washing machine of the present invention is an induction motor, and accordingly, the rotor 200 includes a rotor conductor 220 to generate induced currents when electric currents are applied to the coil 350 instead of a permanent magnet.
  • the rotor conductor 220 is attached to an inner surface of the side wall of the rotor frame 210 that faces the teeth 301 of the stator 300 wound by the coil 301 .
  • the side wall of the rotor 200 includes a rotor core 230 to form a magnetic flux path.
  • FIG 3 illustrates that the rotor conductor 220 is arranged along the inner surface of the side wall of the rotor frame 210 to have an “I” shaped cross-section and that the rotor cores 230 are arranged on opposite sides of the rotor conductor 220 .
  • the rotor conductor 220 may be made of aluminum or copper and formed substantially as one body with the rotor core 230 by die-casting. Because aluminum or copper has little electric resistance and relatively less strength than a conventional material, such as steel, used to make the rotor core 230 , the rotor conductor 220 may be easily attached to the rotor core 230 by process such as die-casting.
  • the rotor conductor 220 may be formed in another embodiment, unlike the one shown in FIG. 3 .
  • FIGS. 5 and 6 illustrate other embodiments of the rotor conductor 220 that will be described below.
  • a rotor conductor 220 as shown in FIGS. 5 and 6 is formed of a thin plate along an inner circumferential surface of a rotor core 230 attached to an inner surface of a side wall of the rotor frame 210 to face the stator 300 . Because the coil 350 of the induction motor 100 according to the present invention is a concentrated winding, multiple-magnetic poles are alternatively formed along the circumferential direction of the stator 300 .
  • the induction motor of the present invention might generate torque ripple or mechanical vibration due to cogging torque, overlapped phase, or frequency harmonics that may be generated by interaction between the slot 303 of the stator 300 and the rotor 200 .
  • this problem arises much less than in conventional motors having permanent magnets. In spite of the reduction of torque ripple, it is desirable to reduce even minute torque ripple.
  • the rotor conductor 220 has a vertical member 221 may be skewed with respect to a horizontal member 223 .
  • the rotor conductor 220 has two horizontal members 223 in parallel along a circumferential direction and a plurality of vertical members 221 are spaced apart by a predetermined distance and extend between the horizontal members 223 to connect the horizontal members 223 to each other.
  • Two adjacent vertical members 221 and the two horizontal members 223 form one closed circuit.
  • Each closed circuit is skewed, and the skew distance “d 1 ” indicates how much each closed circuit is skewed.
  • the skew distance“d 1 ” corresponds to one pitch of the teeth 301 .
  • the vertical member 221 of the rotor conductor 220 is skewed at a predetermined angle( ⁇ sk ), there is a skew distance “d 1 ” between an upper end and a lower end of the vertical member 221 as shown in FIG. 5 .
  • the skew distance “d 1 ” is equal to about one pitch “p” of the teeth 301 .
  • each closed circuit is symmetrically skewed about the center of the circuit, and the skew distance “d 2 ” indicates how much each closed circuit is skewed.
  • the skew distance “d 2 ” falls within about one to two of the pitch of the teeth 301 , i.e, p ⁇ d 2 ⁇ 2xp. Because, a middle portion of the vertical member 221 is projected and each closed circuit is as skewed symmetrically in a vertical direction, the skew distance “d 2 ”, is the distance between the middle portion and an upper or lower end as shown in FIG. 6 .
  • the rotor frame 210 may also include a permanent magnet 150 .
  • the permanent magnet 150 is for detecting a position of the rotor 200 and the rotor speed.
  • a hall sensor (not shown) may be provided on a circumference of the stator 300 to sense a magnetic field of the permanent magnet 150 .
  • the permanent magnet 150 may be also placed on the shaft 4 , different from the above.
  • the hall sensor for detecting the magnetic field of the permanent magnet 150 might be at an inner circumference of the stator 300 . This has the advantage of resulting in a smaller motor 100 because the space for fixing the hall sensor to an outer portion of the stator 300 is not needed.
  • the hall sensor (not shown) senses the, magnetic field of the permanent magnet 150 and a controller (not shown) finds out the position and rotation speed of the rotor 200 by using the information sensed by the hall sensor.
  • the controller (not shown) controls the inverter based on the position and rotation speed of the rotor 200 to control the motor 100 more precisely.
  • a connection structure of the coil provided on the stator, which forms each phase separately, may be changed into a parallel connection structure. That is, high torque should be generated by high electric currents to operate the motor at a high speed, and the size of the electric current is limited in a serial connection structure due to high resistance. As a result, it is difficult to produce high torque as well as operate the motor at a high speed.
  • a parallel connection structure is used for the coil provided on the stator 300 .
  • the resistance value of the parallel connection is smaller than a resistance value of a serial connection so that high electric currents may be applied to the coils.
  • the rotor 200 has been described where the rotor 200 has a cup shape to cover the stator 300 .
  • the rotor 200 may have a cage shape, like in a conventional induction motor.
  • the present invention has the following advantages.
  • the coil wound around the stator is a concentrated winding with a high number of magnetic poles, it is easier to control the motor.
  • control algorithm for the motor may be simpler.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US11/599,436 2005-11-18 2006-11-15 Induction motor for drum washing machine and drum washing machine using same Abandoned US20070113598A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0110837 2005-11-18
KR1020050110837A KR100720551B1 (ko) 2005-11-18 2005-11-18 세탁기용 직결식 유도 모터와 이를 구비한 세탁기

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US11/599,436 Abandoned US20070113598A1 (en) 2005-11-18 2006-11-15 Induction motor for drum washing machine and drum washing machine using same

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US (1) US20070113598A1 (de)
EP (1) EP1788689A1 (de)
KR (1) KR100720551B1 (de)
CN (1) CN1967981A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100242549A1 (en) * 2007-11-07 2010-09-30 Kabushiki Kaisha Toshiba Inverter device for washing machine
US20100251778A1 (en) * 2006-04-13 2010-10-07 Bsh Bosch Und Siemens Hausgerate Gmbh Machine for Washing and/or Drying Laundry
US20100307201A1 (en) * 2007-11-05 2010-12-09 Tsuyoshi Shiga Washing machine
US20110197637A1 (en) * 2008-10-23 2011-08-18 Lg Electronics Inc. Washing Machine
WO2011162624A1 (en) * 2010-06-25 2011-12-29 Fisher & Paykel Appliances Limited A rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
US20130160216A1 (en) * 2011-12-21 2013-06-27 Whirlpool Corporation Laundry treating appliance and method of control
US20150040618A1 (en) * 2009-08-17 2015-02-12 Samsung Electronics Co., Ltd. Motor usable with washing machine and washing machine having the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979978A (zh) * 2014-04-04 2015-10-14 安徽聚隆传动科技股份有限公司 一种洗衣机直驱感应电机
CN108923577A (zh) * 2018-08-15 2018-11-30 朱幕松 低噪音滚筒式洗衣机
JP2022098679A (ja) * 2020-12-22 2022-07-04 青島海爾洗衣机有限公司 乾燥機

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US20050097928A1 (en) * 2003-11-06 2005-05-12 Choi Soung B. Drum type washing machine
US20050104462A1 (en) * 2001-04-02 2005-05-19 Kwon Ho C. Motor for washing machine
US20050223754A1 (en) * 2003-02-06 2005-10-13 Choi Soung B Washing machine

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US6737783B2 (en) * 2000-03-29 2004-05-18 Sanyo Electric Co., Ltd. Sealed motor compressor
US20050104462A1 (en) * 2001-04-02 2005-05-19 Kwon Ho C. Motor for washing machine
US20040245887A1 (en) * 2001-08-08 2004-12-09 Hiroyasu Fujinaka Brush-less motor using vernier structure
US6745456B2 (en) * 2002-02-07 2004-06-08 A. O. Smith Corporation Apparatus and method of making a rotor core with elimination of outer periphery machining
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100251778A1 (en) * 2006-04-13 2010-10-07 Bsh Bosch Und Siemens Hausgerate Gmbh Machine for Washing and/or Drying Laundry
US8250690B2 (en) * 2006-04-13 2012-08-28 Bsh Bosch Und Siemens Hausgeraete Gmbh Machine for washing and/or drying laundry
US20100307201A1 (en) * 2007-11-05 2010-12-09 Tsuyoshi Shiga Washing machine
US8739581B2 (en) 2007-11-05 2014-06-03 Kabushiki Kaisha Toshiba Washing machine
US8704467B2 (en) * 2007-11-07 2014-04-22 Kabushiki Kaisha Toshiba Inverter device for washing machine
US20100242549A1 (en) * 2007-11-07 2010-09-30 Kabushiki Kaisha Toshiba Inverter device for washing machine
US9303351B2 (en) * 2008-10-23 2016-04-05 Lg Electronics Inc. Washing machine
US20110197637A1 (en) * 2008-10-23 2011-08-18 Lg Electronics Inc. Washing Machine
US20150040618A1 (en) * 2009-08-17 2015-02-12 Samsung Electronics Co., Ltd. Motor usable with washing machine and washing machine having the same
US9493899B2 (en) * 2009-08-17 2016-11-15 Samsung Electronics Co., Ltd. Motor usable with washing machine and washing machine having the same
WO2011162624A1 (en) * 2010-06-25 2011-12-29 Fisher & Paykel Appliances Limited A rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
AU2011269936B2 (en) * 2010-06-25 2015-04-09 Fisher & Paykel Appliances Limited A rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
US9325210B2 (en) 2010-06-25 2016-04-26 Fisher & Paykel Appliances Limited Rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
US9806581B2 (en) 2010-06-25 2017-10-31 Fisher & Paykel Appliances Limited Rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
US10079518B2 (en) 2010-06-25 2018-09-18 Fisher & Paykel Appliances Limited Rotor for a motor, and a motor and an appliance comprising the rotor, and a method for making a rotor
US20130160216A1 (en) * 2011-12-21 2013-06-27 Whirlpool Corporation Laundry treating appliance and method of control
US9157177B2 (en) * 2011-12-21 2015-10-13 Whirlpool Corporation Laundry treating appliance and method of control

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Publication number Publication date
KR100720551B1 (ko) 2007-05-22
EP1788689A1 (de) 2007-05-23
CN1967981A (zh) 2007-05-23

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