US20020116961A1 - Washing machine - Google Patents

Washing machine Download PDF

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Publication number
US20020116961A1
US20020116961A1 US10/083,487 US8348702A US2002116961A1 US 20020116961 A1 US20020116961 A1 US 20020116961A1 US 8348702 A US8348702 A US 8348702A US 2002116961 A1 US2002116961 A1 US 2002116961A1
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United States
Prior art keywords
field magnet
shaft
rotor
field
electric motor
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
US10/083,487
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English (en)
Inventor
Houng Kim
Yoshitaka Iwaji
Yasuo Notohara
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Assigned to HITACHI, LTD. reassignment HITACHI, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWAJI, YOSHITAKA, KIM, HOUNG JOONG, NOTOHARA, YASUO
Publication of US20020116961A1 publication Critical patent/US20020116961A1/en
Abandoned legal-status Critical Current

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    • 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 
    • D06F37/40—Driving arrangements  for driving the receptacle and an agitator or impeller, e.g. alternatively
    • 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
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
    • H02K21/029—Vectorial combination of the fluxes generated by a plurality of field sections or of the voltages induced in a plurality of armature sections

Definitions

  • the present invention relates to an electric motor which uses a permanent magnet as a field magnet, particularly to an electric motor for driving a washing machine and a control method thereof, and relates to an electric motor and a control method thereof in which positions of the magnetic pole centers of said first field magnet and said second field magnet can be changed, and the amount of the effective magnetic flux can be changed according to the number of revolution.
  • an induced electromotive force E is determined by a constant magnetic flux ⁇ generated by a permanent magnet arranged in a rotor and a rotating angular speed ⁇ of the motor. That is, when the rotating angular speed ⁇ (rotating speed) of the motor is increased, the induced electromotive force is proportionally increased.
  • the torque of the electric motor is transmitted by the belt and the gear through pulley so that the electric motor of the washing machine may secure a fixed power output in a wide speed range.
  • the washing machine comprises a washing spin-drying drum pivotted freely around a rotation axis in the outside tank, a body of revolution pivotted freely around a rotation axis whose center is the same as one of said rotation axis at the bottom of said washing spin-drying drum, a change-over mechanism for connecting or releasing the rotation axis of said washing spin-drying drum to the rotation axis of the body of revolution, and an electric motor, whereby washing or rinsing operation is carried out by rotating forward or reversely the body of revolution to stir the inside of said washing spin-drying drum, and then spin-drying operation is performed.
  • Said electric motor comprises a stator having a primary winding and a rotor having a field magnet, said field magnet comprising a first field magnet having different polarity magnetic poles sequentially arranged in a rotating direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotating direction, said first and said second field magnets being opposite to magnetic poles of said stator; and a mechanism for changing a phase of a composite magnetic pole of said first and said second field magnets with respect to the magnetic pole of said first field magnet depending on a direction of torque, said mechanism for changing depending on a direction of torque comprising means for making magnetic pole centers of equal-polarity of said first and said second field magnets in phase by a direction of torque generated in said rotor and by balance of magnetic action forces between said first and said second field magnets; and means for making the magnetic pole centers of said first and said second field magnets out of phase when the direction of torque generated in the rotor is reversed.
  • FIG. 1 is a schematic diagram showing a washing machine having an embodiment of a permanent magnet type synchronous motor.
  • FIG. 2 is a schematic view showing a case (a first case) where magnetic pole centers of equal-polarity of the rotor of the motor in FIG. 1 are out of phase.
  • FIG. 3 is a schematic view showing a case where magnetic pole centers of equal-polarity of the rotor of the motor in FIG. 1 are in phase.
  • FIG. 4 is a schematic view showing a case (a second case) where magnetic pole centers of equal-polarity of the rotor of the motor in FIG. 1 are out of phase.
  • FIG. 5 is graphs showing various kinds of characteristics versus rotating speed of the motor in FIG. 1.
  • FIG. 6 is a control block diagram of the motor in FIG. 1.
  • FIG. 7 is a view showing another embodiment of a motor in accordance with the present invention (an actuator in OFF state).
  • FIG. 8 is a view showing another embodiment of a motor in accordance with the present invention (an actuator in ON state).
  • FIG. 9 is a view showing the inside of the rotor of another embodiment of a motor in accordance with the present invention.
  • FIG. 10 is a view showing the inside of a rotor of another embodiment of a motor in accordance with the present invention.
  • FIG. 11 is a view showing another embodiment of a motor in accordance with the present invention (an actuator in ON state).
  • FIG. 12 is a schematic view showing measurement of axial direction displacement in another embodiment of a motor in accordance with the present invention.
  • FIG. 13 is a schematic view showing a rotor of another embodiment of a motor in accordance with the present invention (adding gap difference).
  • FIG. 14 is a view showing another embodiment of a motor in accordance with the present invention.
  • FIG. 15 is a schematic view showing a rotor of another embodiment of a motor in accordance with the present invention (a case where the present invention is applied to a 8-pole motor).
  • FIG. 16 is a schematic view showing the arragement of another embodiment of a motor in accordance with the present invention.
  • FIG. 1 shows the outline of the washing machine in which the permanent magnet type synchronous motor according to this embodiment is provided.
  • the permanent magnet field type synchronous motor which drives directly pulsator 73 is used as electric motor 2 .
  • Electric motor 2 rotates pulsator 73 and spin-drying drum 72 through the clutch.
  • washing machine case 70 shown in FIG. 1 there are outside tank 71 and washing spin-drying drum 72 .
  • This is a washing machine which comprises a washing spin-drying drum pivotted freely around rotation axis 22 in outside tank 71 , pulsator 73 pivotted freely around a rotation axis whose center is the same as one of said rotation axis at the bottom of said washing spin-drying drum, change-over mechanism 77 for connecting or releasing the rotation axis of said washing spin-drying drum to the rotation axis of said pulsator, and electric motor 2 , whereby washing or rinsing operation is carried out by rotating forward or reversely the body of revolution to stir the inside of said washing spin-drying drum, and then spin-drying operation is performed.
  • washing machines There are two type washing machines. In one type, the water is collected only in the spin-drying drum, and in the other type, the water is accumulated in the whole water tank 71 including the spin-drying drum, when the rinsing is carried out.
  • the present invention can be applied to the washing machine of which type.
  • the washing machine of such configuration is driven by inverter 78 .
  • This inverter requires the control by a microcomputer, and is an electric motor control circuit with the function as the rotation control means for changing the number of revolution by receiving an instruction from the microcomputer.
  • the microcomputer control circuit is built into the inverter.
  • Inverter 78 has the function as a motor electric current detection means by which the current value which flows to electric motor 2 is detected.
  • drain valve 74 , system control panel 75 , and water level sensor 76 , etc. are further provided as the basic component element of the washing machine.
  • FIG. 2 is a schematic view showing a case where the centers of equal-polarity of the rotor of the motor shown in FIG. 1 are out of phase.
  • armature windings 11 are wound and set inside slots of a stator core 10 , and bonded to a housing 13 having cooling paths 12 inside of which coolant flows.
  • the rotor of a permanent magnet embedded type 20 is composed of a first rotor 20 A fixed to a shaft 22 and a second rotor 20 B separated from the shaft 22 .
  • the rotor may be a rotor of a surface magnet type instead of the rotor of a permanent magnet embedded type.
  • first rotor 20 A permanent magnets 21 A are arranged so as to be alternatively aligned magnetic poles of different polarity in the rotating direction.
  • permanent magnets 21 B are arranged so as to be alternatively aligned magnetic poles of different polarity in the rotating direction.
  • the field magnets coaxially arranged in the two rotors of the first and the second rotors are opposite to magnetic poles of the stator.
  • a nut portion 23 B is formed in the inner side of the second rotor 20 B, and a bolt screw portion 20 A to be in contact with the nut portion 23 B is formed in the shaft.
  • a stopper 24 is arranged at a position apart from the side surface of the second rotor 20 B so that the second rotor 20 B may not exceed a preset displacement from the center of the stator. Furthermore, by providing a servo mechanism of an actuator 25 for driving the stopper to make the stopper movable in the direction of shaft axis, the displacement between the magnetic pole centers of the first field magnet and the second field magnet can be varied. As the result, it is possible to control the total effective magnetic flux composed of the first field magnet and the second field magnet to the stator having the armature windings in the slits.
  • the high torque characteristic is obtained by compulsorily making the centers of equal-polarity of first rotor 20 A and second rotor 20 B arranged, and increasing the amount of the effective magnetic flux by the stator magnetic pole and the opposed permanent magnet as shown in FIG. 3.
  • FIG. 4 schematically shows the state that the effective magnetic flux by the stator magnetic poles and the opposite permanent magnets is decreased by making the centers of equal-polarity of the first rotor 20 A and the second rotor 20 A out of phase while the gap between the first rotor 20 A and the second rotor 20 B is being widened.
  • FIGS. 3 and 4 there are associative illustrations of a head portion 61 of a bolt, a bolt screw portion 60 and a nut portion 62 .
  • the head portion 61 of the bolt corresponds to the first rotor 20 A
  • the nut portion 62 corresponds to the second rotor 20 B.
  • the bolt screw portion 60 (corresponding to the part 23 A in FIG. 2) is rotating a direction
  • the nut portion 62 is fastened or unfastened depending on the direction of torque acting on the nut portion 62 .
  • the similar phenomenon occurs in the second rotor 20 B depending on the direction of torque acting on the rotor.
  • FIG. 3 shows the state of the forward rotation
  • FIG. 4 shows the state of the backward rotation.
  • a nut portion 23 B is formed in the inner side of the second rotor 20 B, and a bolt screw portion 20 A to be in contact with the nut portion 23 B is formed in the shaft. Both of them are connected by using the screw function.
  • the states shown in FIGS. 3 and 4 are opposite each other if the direction of the screw is reversed (for instance, from a left screw to a right screw), the same effect is obtained.
  • Second rotor 20 B is movable in the axial direction while being rotated with respect to the shaft.
  • FIG. 5 shows the characteristics of the effective flux, the induced electromotive force and the terminal voltage versus the angular rotating speed of the permanent magnet synchronous motor.
  • the induced electromotive force E is determined by a constant magnetic flux ⁇ generated by the permanent magnets arranged in the rotor and an angular rotating speed ⁇ of the electric motor. That is, as shown in FIG. 6( a ), if the constant magnetic flux ⁇ 1 is constant, the induced electromotive force E 1 is proportionally increased as the angular rotating speed ⁇ (rotating speed) is increased.
  • the output voltage of the inverter due to the terminal voltage of the power supply and the capacity of the inverter
  • FIG. 5( b ) is a schematic graph showing that when the magnetic flux ⁇ is changed little by little corresponding to the angular rotating speed ⁇ (rotating speed), the induced electromotive force E can be maintained constant.
  • the first field magnet of a motor is fixed to a shaft, and the second field magnet is separated from the shaft.
  • the shaft and the second field magnet have screw functions to be connected to each other by forming a bolt screw portion in the shaft and a nut portion inside the second field magnet.
  • a stopper is provided at a position apart from a side surface of the second field magnet, and a servo mechanism capable of moving the stopper in parallel to the shaft according to a rotating speed is provided.
  • FIG. 6 shows the control block of electric motor 2 of FIG. 1.
  • drive judgment part 101 judges the drive operation of permanent magnet type synchronous motor 2 based on the set information from system control panel ( 75 in FIG. 1), the information from water level sensor 76 and the number of revolution of permanent magnet type synchronous motor 2 , and outputs the electric current instruction value.
  • the output from current control block 102 is converted into a three-phase alternating current in rotational coordinate transformation part 103 , and controls permanent magnet type synchronous motor 2 .
  • Each phase current of permanent magnet type synchronous motor 2 is converted into the biaxial current by detecting each phase current (at least two phase currents) and the number of revolution, and fed back to the current instruction value. Further, the number of revolution, the magnetic pole position, etc. are detected by detector 106 , and fed back to each control block through magnetic pole position transformation part 107 and speed transformation part 108 .
  • FIG. 7 comprises a position-and-speed sensor of the motor 2 and a current sensor of the motor, a control circuit of a sensor-less structure for driving the motor 2 without part of these sensors may be applicable.
  • the permanent magnet synchronous motor of the present invention since in the permanent magnet synchronous motor of the present invention, the pole centers of equal-polarity of the first and the second rotors are brought in phase or out of phase corresponding to the operating condition, the permanent magnet synchronous motor of the present invention has a function of correcting a lead angle of current supply by a controller for controlling the inverter corresponding to a positional shift angle of the composite magnetic pole of the first field magnet and the second field magnet.
  • FIG. 12 shows the relationship between rotation angle and displacement in the axial direction when the pole centers of equal-polarity of the first rotor and the second rotor are in phase or out of phase corresponding to the operating condition.
  • the axial displacement ⁇ L is measured using a displacement meter 64 , and fed back to the position detecting circuit (the reference numeral 106 in FIG. 6) of the control circuit to be used for optimum control to correct the lead angle of current supply as a converted value of the shift angle of the composite magnetic pole position of the first field magnet and the second field magnet.
  • FIG. 7 is a view showing another embodiment of a motor in accordance with the present invention.
  • the first rotor 20 A is fixed to the shaft 22 , the second rotor 20 B being separated from the shaft 22 , the bolt screw portion 23 A being formed in part of the shaft, a sleeve 41 being fixed to the inside of the second field magnet, the nut portion 23 B being fixed to the inside of the sleeve 41 .
  • the second rotor 20 B is rotated with respect to the first rotor 20 A while the gap between the first rotor 20 A and the second rotor 20 B is being widened as if a nut portion were screwed off from a bolt screw portion.
  • the sleeve 41 is made of a non-magnetic material having an electric resistivity higher than that of iron. By doing so, the inside of the second field magnet and the shaft 22 are magnetically and electrically insulated by the sleeve 41 .
  • Supporting mechanisms 40 A, 40 B are arranged inside the sleeve 41 so as to guide rotating motion, reciprocal motion and the composite motion between the second field magnet and the shaft.
  • the second rotor 20 B is connected to the shaft by forming a screw function of the bolt screw portion 23 A in part of the shaft, and a movable stopper 24 is arranged at a position apart from a side surface of the second field magnet, and supporting mechanisms 42 , 47 are arranged between the stopper 24 and the shaft, and between the stopper and the side surface of the second rotor 20 B so as to guide rotating motion, reciprocal motion and the composite motion between the second rotor with respect to the shaft.
  • the supporting mechanism 42 has a function of a thrust bearing
  • the supporting mechanism 47 has a function of guiding the rotating motion, the reciprocal motion and the composite motion though it is a radial bearing.
  • the structure of the magnetic clutch is that a coil 46 is wound around a yoke 44 , and a stopper 24 may also serve as a movable core.
  • the yoke 44 and the coil 46 are fixed to a frame 49 of the motor or to a part of the compressor, not shown, and a spring 45 is arranged between the yoke 44 and the stopper 24 so as to have a function of a reset device at braking excitation.
  • a bearing 50 is arranged between the frame 49 and the shaft 22 to support the shaft 22 .
  • FIG. 7 shows the coil 46 under a non-excited state
  • FIG. 8 shows the coil 46 under an excited state.
  • the yoke 44 becomes a strong magnet by exciting the coil 46 to attract the stopper 24 also having the function as the movable core.
  • burden of conducting current to the coil 46 can be reduced by adding torque to the second rotor 20 B so as to be rotated with respect to the first rotor 20 A while the gap between the first rotor 20 A and the second rotor 29 B is being widened as if a nut portion were screwed off from a bolt screw portion.
  • FIG. 9 shows an example of the sleeve 41 to be fixed to the inside of the second rotor 20 B.
  • the second rotor 20 B and the sleeve 41 are fixed by forming projected and depressed portions on the contact surfaces of the two parts. Difference in the structure of the inside portions between the first rotor 20 A fixed to the shaft 22 and the second rotor 20 B separated from the shaft 22 is shown in FIG. 9.
  • FIG. 10 shows another embodiment of the present invention.
  • FIG. 11 shows another embodiment of the present invention.
  • FIG. 11 shows the coil 46 under the excited condition, and the yoke 44 is detached from the stopper 24 by the spring 45 at cutting off the excitation.
  • the embodiment has a characteristic that a thrust force is applied to the second rotor 20 B by the screw function due to an interaction between the bolt screw portion 23 A on which torque is applied and the nut portion 23 B. Therefore, when the excitation of the coil 46 is cut off, the stopper 24 is detached from the yoke 44 by adding the thrust force to push out the stopper 24 due to the interaction between the screw and the torque.
  • the yoke 44 is fixed to the frame 49 through an arm 52 , or to a part of the compressor, not shown.
  • the magnetic clutch shown in FIG. 11 is an example of a servo mechanism capable of moving the stopper 24 in parallel to the shaft, positioning of the stopper can be more accurately performed by employing a hydraulic actuator, a linear driving device using a rotor and a ball screw, a linear motor or the like.
  • FIG. 13 shows other embodiments of the present invention.
  • the motor in accordance with the present invention is characterized by that the first rotor 20 A is firmly fixed to the shaft 22 , but the second rotor 20 B has freedom to the shaft. Therefore, there is a small play in the mechanical dimension between the second rotor 20 B and the shaft 22 , and accordingly the second rotor 20 B may become eccentric when large torque or a centrifugal force is applied to the second rotor 20 B.
  • the air gap Gap 2 between the second rotor 20 B having the second field magnet and the stator is made larger than the air gap Gap 1 between the first rotor 20 A having the first field magnet and the stator. By doing so, the mechanical contact between the second rotor 20 B and the stator caused by decentering can be prevented.
  • a plurality of springs 48 and 51 are arranged between the stopper 24 and the second rotor 20 B and between the first rotor 20 A and the second rotor 20 B, respectively.
  • FIG. 14 shows the dynamo-electric machine according to another embodiment of the present invention.
  • the concavo-convex portion is provided to shaft 22 like the cogwheel instead of the screw part of the second rotor shown in FIG. 2, and the convexo-concave portion is provided to insert the shaft on the inner diameter side of the second rotor.
  • only fixed rotating angle ⁇ can be moved by enlarging the width of the ditch more than the width of the engaging teeth when shaft 22 is inserted into the inner diameter side of the second rotor.
  • a rapid collision can be softened by providing spring 26 and dumper 27 between the engaging teeth and ditches.
  • an actuator is provided.
  • the high torque characteristic is obtained by compulsorily making the centers of equal-polarity of first rotor 20 A and second rotor 20 B arranged, and increasing the amount of the effective magnetic flux by the stator magnetic pole and the opposed permanent magnet as shown in FIG. 3.
  • FIG. 15 is a schematic view showing a rotor of a permanent magnet synchronous motor in which the present invention is applied to an eight-pole motor. Further, the present invention can be applied to any type of rotor, an embedded magnet type or a surface magnet type.
  • FIG. 16 is a schematic view showing washing machines of a direct drive method type and of a gear-combined method type.
  • FIG. 16 shows the direct drive method
  • FIG. 16( b ) shows the gear-combined method
  • gear 79 is provided on the shaft of said washing spin-drying drum and between change-over mechanism ( 77 of FIG. 1) for connecting or releasing to the shaft of said pulsator ( 73 of FIG. 1) and electric motor 2 .
  • the gear can be installed in change-over mechanism 77 .
  • change-over mechanism 77 it is needless to say that both are applicable as an electric motor of the present invention.
  • the permanent magnet synchronous motor in accordance with the present invention is constructed in that the rotors divided into the first field magnet and the second field magnet are arranged on the single shaft, and the pole centers of the first and the second field magnets are varied depending on the direction of torque, there is the effect that the effective magnetic flux by the permanent magnets opposite to the stator magnetic poles can be varied.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Brushless Motors (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US10/083,487 2001-02-28 2002-02-27 Washing machine Abandoned US20020116961A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-53431 2001-02-28
JP2001053431A JP3879415B2 (ja) 2001-02-28 2001-02-28 洗濯機

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US20020116961A1 true US20020116961A1 (en) 2002-08-29

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US10/083,487 Abandoned US20020116961A1 (en) 2001-02-28 2002-02-27 Washing machine

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JP (1) JP3879415B2 (ru)
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Cited By (17)

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US20020117926A1 (en) * 2001-02-28 2002-08-29 Hitachi, Ltd. Transport system and dynamo-electric machine
US20020117922A1 (en) * 2001-02-28 2002-08-29 Hitachi, Ltd. Machine tool
US20040021390A1 (en) * 2002-07-31 2004-02-05 Kim Houng Joong Rotary electric machine and automobile provided with the same
US20040041489A1 (en) * 2002-08-28 2004-03-04 Horst Gary E. Interior permanent magnet motor for use in washing machines
US20040041483A1 (en) * 2002-08-28 2004-03-04 Gary Horst E. Permanent magnet machine
US6727623B2 (en) 2002-08-28 2004-04-27 Emerson Electric Co. Reduced impedance interior permanent magnet machine
US6891298B2 (en) 2002-08-28 2005-05-10 Emerson Electric Co. Interior permanent magnet machine with reduced magnet chattering
US20070267990A1 (en) * 2006-05-22 2007-11-22 Black & Decker Inc. Electronically commutated motor and control system employing phase angle control of phase current
US20090192013A1 (en) * 2007-11-26 2009-07-30 Hitachi, Ltd. Hybrid Vehicle
US20100201294A1 (en) * 2007-09-18 2010-08-12 Kabushiki Kaisha Toshiba Variable magnetic flux drive system
US20110314875A1 (en) * 2009-03-02 2011-12-29 BSH Bosch und Siemens Hausgeräte GmbH Method and circuit arrangement for determining the load and/or unbalance of a laundry drum of a washing machine
CN107488971A (zh) * 2017-08-30 2017-12-19 青岛海尔洗衣机有限公司 减速器和采用该减速器的洗衣机
US20180083556A1 (en) * 2015-04-06 2018-03-22 Lg Electronics Inc. Laundry treatment apparatus
US20180223467A1 (en) * 2015-08-04 2018-08-09 Aqua Co., Ltd Washing Machine
US10291170B2 (en) * 2015-02-10 2019-05-14 Lg Electronics Inc. Motor driving device and laundry treatment apparatus including the same
US10513816B2 (en) * 2014-08-05 2019-12-24 Haier Asia Co., Ltd. Drum washing machine
US11424653B2 (en) * 2018-12-13 2022-08-23 Chun-Jong Chang DC motor-dynamo for bidirectional energy conversion between mechanical and electrical energy

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JP2005021362A (ja) * 2003-07-02 2005-01-27 Hitachi Home & Life Solutions Inc 洗濯機及び洗濯乾燥機
JP5089066B2 (ja) * 2006-03-27 2012-12-05 本田技研工業株式会社 電動機
JP4515439B2 (ja) * 2006-12-04 2010-07-28 本田技研工業株式会社 ハイブリッド車両の制御装置
JP5329801B2 (ja) * 2007-12-20 2013-10-30 株式会社東芝 可変磁束ドライブシステム
CN114150475B (zh) * 2021-11-26 2024-01-12 深圳和而泰小家电智能科技有限公司 一种活体检测方法、电路以及衣物处理设备
CN115632533B (zh) * 2022-12-07 2023-04-14 江苏中工高端装备研究院有限公司 一种永磁同步电机磁变量实时监测装置及监测方法

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Cited By (26)

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Publication number Priority date Publication date Assignee Title
US20020117926A1 (en) * 2001-02-28 2002-08-29 Hitachi, Ltd. Transport system and dynamo-electric machine
US20020117922A1 (en) * 2001-02-28 2002-08-29 Hitachi, Ltd. Machine tool
US6841911B2 (en) * 2001-02-28 2005-01-11 Hitachi, Ltd. Machine tool
US6975055B2 (en) * 2001-02-28 2005-12-13 Hitachi, Ltd. Dynamo-electric machine having a rotor with first and second axially or rotationally displaceable field magnets
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JP3879415B2 (ja) 2007-02-14
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