KR20170131092A - Apparatus for Driving Washing Machine, Washing Machine Using the Same and Driving Method of Washing Machine - Google Patents

Abstract

The present invention relates to an apparatus for driving a washing machine, a washing machine having the same and a driving method of a washing machine which can minimize energy consumption when forming washing water currents in opposite directions by driving a pulsator and a washing tank in reverse directions to form strong three-dimensional washing water currents with high cleanness. The apparatus for driving a washing machine comprises: a double-rotor double-stator drive motor having an inner rotor and an outer rotor which can be independently controlled by double stators; an inner shaft to transfer an output of the outer rotor to a pulsator; an outer shaft to transfer an output of the inner rotor to a washing tank; and a control unit to control the inner rotor and the outer rotor. The control unit controls to allow the pulsator to have stop time when the pulsator switches a rotational direction to a clockwise direction and a counterclockwise direction during a washing cycle and allow the washing tank to start before driving time in the clockwise direction and the counterclockwise direction of the pulsator ends to be driven in a direction opposite to the rotational direction of the pulsator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a washing machine driving apparatus, a washing machine having the washing machine driving apparatus,

The present invention relates to a washing machine, and more particularly, to a washing machine capable of minimizing energy consumption when washing water is formed in opposite directions by reverse driving of a pulsator and a washing machine in order to form a powerful three- A washing machine having the same, and a method of driving the washing machine.

The washing machine disclosed in Korean Patent Laid-Open Publication No. 10-1999-0076570 (Patent Document 1) has a washing motor having a low-speed high-torque motor characteristic and a dehydrating motor having a high- The motor is an outer rotor type and has a larger diameter than the dehydrating motor, and the dehydrating motor is configured as an inner rotor type so that the washing motor is outside and the dehydrating motor is inside relation.

In the washing machine of Patent Document 1, although the washing motor is of the outer rotor type and has a larger diameter than the dehydrating motor, there is a problem that the driving torque is insufficient to process a large capacity laundry in a large capacity washing machine of 8 kg or more.

Furthermore, the washing machine disclosed in Patent Document 1 proposes a structure in which the agitator is driven by an outer rotor type washing motor having a larger diameter than the dehydrating motor and disposed on the outer side and having a low speed high torque motor characteristic, There is a problem that it is difficult to realize a strong washing water flow by rotating the rotating tub in which the torque is required in the opposite direction to the stirring member.

Therefore, although the washing machine disclosed in Patent Document 1 has a structure capable of independently driving the agitator and the rotating drum by using two driving motors, it has been proposed to make various types of washing water using high torque in a large- .

In the washing machine of Patent Document 1, the dewatering motor is set to the energizing mode for rotating in the direction opposite to the washing motor at the time of the washing process, or by the driving of the stirrer by the washing motor only in a state in which the rotating tub is idly rotated by the electric brake So that a stronger water flow (washing power) capable of washing a large load laundry in a large capacity washing machine can not be generated.

Furthermore, in the washing machine of Patent Document 1, when the pulsator (stirring body) and the washing tank (rotating bath) are rotated in opposite directions to form a strong water flow which increases three degrees, the inner rotor is small in diameter and small in driving torque When the washing machine is filled with a large amount of laundry and water, the initial starting current is excessively consumed due to insufficient driving torque of the inner rotor, resulting in a reduction in efficiency.

In consideration of the problems of such a conventional automatic washing machine, a double rotor-double stator type bicycle drive motor and a planetary gear unit are combined with a dewatering pump and a pulsator in Korean Patent Laid-Open No. 10-2015-0008347 (Patent Document 2) A plurality of washing water streams are simultaneously and independently driven to thereby form various washing water streams.

The patent document 2 proposes a washing method in which the pulsator and the washing tub are rotated in the same or opposite direction to each other during the washing cycle to form countercurrent washing water or the like in the mutually opposite directions. There has been no proposal of a water flow forming method considering an increase in efficiency.

Particularly, in Patent Document 2, when the washing water is mutually reversed by the bi-directional force during the washing process, the washing tub is simultaneously driven in different directions and at the same speed as the pulsator, A problem may arise.

Meanwhile, a conventional automatic washing machine using a single power generates a vertical rising / falling water stream by repeating forward rotation, stopping, reverse rotation, and stopping of the pulsator to change direction, so that water and detergent .

In this case, A.C. Induction motor is used. It is operated by repeatedly starting and stopping in a short time period within a range of 0.5 sec. To 2 sec. In each operation time and stopping time with preset RPM according to application of drive signal, And the like are used. In this case, the operating rate is 50%.

The induction motor is characterized by low noise and low vibration. However, since it is an asynchronous motor that exhibits a low torque characteristic at low speed and a slow dynamic reaction, it is difficult to form a strong washing water flow while rapidly changing the direction of rotation in forward and reverse directions have.

On the other hand, the BLDC motor has not been proposed as a synchronous motor which has quick dynamic reaction, low rotor inertia, easy speed control, and a drive device for a washing machine in the past.

: Korean Patent Publication No. 10-1999-0076570 : Korean Patent Publication No. 10-2015-0008347

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and its object is to provide a three-dimensional washing machine, The present invention provides a washing machine driving apparatus and a washing machine using the washing machine, which can minimize energy consumption when washing water is formed in opposite directions by reverse driving of a pulsator and a washing tub.

Another object of the present invention is to provide a washing machine driving method capable of forming a strong vortex with high cleaning power by improving the starting method and the stopping method of a bi-motive driving motor when the pulsator and the washing tank are reciprocated by using bi- There is.

It is still another object of the present invention to provide a washing machine and a washing machine driving method capable of minimizing the overall power consumption by increasing the operating rate and shortening the overall washing time by setting the operating time to be sufficiently longer than the stopping time so as to utilize the characteristics of the BLDC motor .

Another object of the present invention is to provide a method of manufacturing a washing machine, which is capable of increasing the driving torque of an inner rotor by using a magnet of an inner rotor having a small diameter and a small driving torque and a rare earth magnet having a high magnetic flux density, And a washing machine using the washing machine, wherein the washing machine is filled with water even when the washing machine is initially started.

Another object of the present invention is to provide a washing machine which drives a washing tub with a large-diameter outer rotor having a large driving torque and a small-diameter inner rotor with a small driving torque that uses a rare earth- And a washing machine using the same.

It is another object of the present invention to provide an internal rotor having a small diameter and a large-diameter outer rotor using a rare-earth magnet and an outer rotor having a large driving torque, The present invention also provides a washing machine driving apparatus and a washing machine using the same, which can simultaneously form a washing water flow and a rinsing pattern by driving a pulsator and a washing tub at the same time.

According to a first aspect of the present invention, there is provided a double rotor-double stator type drive motor having an inner rotor and an outer rotor independently controllable by a double stator and selectively generating an inner rotor output and an outer rotor output, ; An inner shaft for transmitting the outer rotor output to the pulsator; An outer shaft rotatably coupled to an outer periphery of the inner shaft and transmitting the output of the inner rotor to a washing tub; And a control unit for independently applying first and second driving signals to the double stator to control the inner rotor and the outer rotor, wherein the control unit controls the pulsator to rotate clockwise and counterclockwise And the washing tub is started before the pulsator's clockwise and counterclockwise driving time ends to drive the pulsator in a direction opposite to the rotational direction of the pulsator. do.

The driving of the washing tub may be extended until the pulsator stops.

In addition, the washing tub may be driven in a direction opposite to the rotational direction of the pulsator simultaneously with the clockwise and counterclockwise starting of the pulsator, and then the driving time may be shorter than the pulsator driving time.

Furthermore, the driving time and the stopping time of the pulsator may be set in the range of 1.5: 1 to 10: 1.

The overshooting driving may be performed during start and stop operations of the pulsator, and the ramp-up driving may be performed at the start of the pulsator. The pulsator may be driven at a variable speed.

The higher the RPM of the pulsator at the time when the electromagnetic brake is made to switch the direction of rotation of the pulsator, the more the stopping time may be increased. In this case, stopping of the pulsator can be performed by using a driver for driving the outer rotor.

The driving torque of the inner rotor may be set to be equal to the driving torque of the outer rotor. In this case, the inner rotor may use a rare earth magnet, and the outer rotor may use a ferrite magnet.

Wherein the outer rotor includes a plurality of second magnets disposed at an outer surface of the stator with a predetermined gap therebetween and having N poles and S poles alternately arranged; A second back yoke disposed on a back surface of the second magnet; And an outer rotor support for supporting the second magnet and the second back yoke.

In this case, the outer rotor support body preferably has an outer flat portion facing the inner and outer stator coils of the stator in a cup-shaped bottom surface in cross section, an inner flat portion engaged with the inner shaft, Wherein the outer flat portion has first and second through holes for discharging heat generated from the inner and outer stator coils to the outside, respectively, at portions of the outer flat portion opposite to the inner and outer stator coils .

Further, the outer rotor support body includes a plurality of radial direction reinforcing ribs protruding radially from the outer circumferential surface and the inner circumferential surface at a predetermined angle, respectively; And first to third circumferential reinforcing ribs formed on the inner circumferential surface thereof at intervals in the circumferential direction.

According to a second aspect of the present invention, there is provided a washing machine comprising: an outer tub for receiving wash water; A washing tub which is rotatably disposed inside the outer tub to perform washing and dehydrating; A pulsator arranged rotatably in the washing tub to form wash water; And a washing machine driving device for simultaneously or selectively driving the washing tub and the pulsator.

According to a third aspect of the present invention, there is provided a method of driving a pulsator, comprising: a first step of rotationally driving a pulsator in a first direction for a first period; Rotating the washing tub in a direction opposite to the first direction for a second period before the first period ends; A third step of stopping the pulsator according to the elapse of the first period; A fourth step of stopping the washing tub according to the passage of the second period after the lapse of the first period; And a fifth step of, when the stop time of the pulsator has elapsed after the lapse of the second period of time, executing the rotation steps of the pulsator and the washing tub sequentially in the first to fourth steps, respectively, Wherein the washing machine comprises a washing machine.

As described above, in the present invention, when a double-rotor-double stator type bipotal driving motor is used to form a washing water flow by reversing the pulsator and the washing tank to each other, energy consumption is minimized, Dimensional three-dimensional washing water stream.

In addition, in the present invention, a strong vortex with high washing power can be formed by improving the start-up method and the stopping method of the bi-motive driving motor while the pulsator and the washing tank are reciprocated by using bi-motive force.

Further, in the present invention, the operation time is set to be sufficiently longer than the stop time so as to utilize the characteristics of the BLDC motor, so that the overall operation time can be shortened and the overall power consumption can be minimized.

Further, in the present invention, by setting a proper ratio of the operation time and the stop time of the inner rotor and the outer rotor in the bidirectional water flow washing operation in which the pulsator and the washing tub are rotated in opposite directions to each other using the bi- So that the efficiency of the washing machine can be increased.

In the present invention, a small-diameter inner rotor that drives a washing machine that requires a high torque with a large-diameter outer rotor having a large driving torque and a small-diameter inner rotor with a small driving torque uses a rare earth- The pulsator can be driven.

In addition, in the present invention, the driving torque of a small-diameter inner rotor using a rare-earth-based high magnetic force magnet and the driving torque of a large-diameter outer rotor having a large driving torque are equally implemented in order to increase the driving torque, The pulsator and the washing machine can be driven at the same time to form various water flow and rinse patterns such as washing water in opposite directions.

According to the present invention, when forming a washing water in opposite directions, a magnet of an inner rotor having a small diameter and a small driving torque is used as a rare earth magnet having a high magnetic flux density, so that the driving torque of the inner rotor is increased, The initialization of the filled washing machine is not accompanied by any difficulties.

Further, in the present invention, since the outer rotor having a large driving torque is connected to the washing tank requiring high torque and the inner rotor having a small driving torque is connected to the pulsator capable of driving at a low torque, It is possible to increase the driving torque and to form various water flow and rinse patterns such as washing water in mutually opposite directions.

In addition, according to the present invention, as the structure is simplified by eliminating the planetary gear device for torque transmission, the assembly productivity can be improved, manufacturing cost can be reduced, and noise generated at the time of torque transmission can be removed.

The present invention can be applied to a large-capacity washer by equally realizing the driving torque of the inner rotor and the outer rotor.

1 is an axial cross-sectional view of a washing machine having a washing machine driving apparatus according to a first embodiment of the present invention.
2 is an axial sectional cut-away sectional view of the washing machine driving apparatus shown in Fig.
Figs. 3A to 3D are a rear view, an inner side view, a right side view, and a cross-sectional view of the outer rotor of Fig. 3A, respectively, of the outer rotor shown in Fig.
4A is a cross-sectional view in the radial direction of the drive motor according to the present invention.
4B is a schematic cross-sectional view of a stator core assembly used for stator assembly.
4C is a plan view of the divided cores constituting the stator core.
5 is a graph showing a comparison of torque and efficiency when a ferrite magnet and an Nd magnet are used in an inner rotor.
6 is a block circuit diagram of a washing machine control apparatus according to the present invention.
7 is a flowchart illustrating an overall washing machine driving method according to the present invention.
8A and 8B are flowcharts illustrating a method of forming counter-directional washing water streams according to the present invention.
FIGS. 9 to 12 are timing charts of the RPM of the pulsator and the washing tub for implementing the mutually opposing washing water flow forming method according to the present invention, respectively.
13 is an axial sectional view of a washing machine driving apparatus according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience.

1 to 4C, a washing machine according to a first embodiment of the present invention includes a case 100 constituting an outer shape, an outer tub 110 disposed inside the case 100 to receive washing water, A pulsator 130 rotatably disposed in the outer tub 110 to perform washing and dewatering; a pulsator 130 rotatably disposed on the bottom of the washing tub 120 to form washing water; A washing machine driving device 120 provided at the lower portion of the washing tub 120 and the outer tub 110 for simultaneously or selectively supplying a driving force required for the laundry washing and drying machine 120 and the pulsator 130, (150).

The washing machine driving device 150 includes a double rotor-double stator type driving motor 140 mounted at a lower portion of the outer tub 110 and generating a biaxial force from the inner rotor 40 and the outer rotor 50, The outer shaft 20 and the inner shaft 30 receiving the braking force provided by the inner rotor 40 and the outer rotor 50 of the motor 150 and transmitting the pulsator 130 to the washing tub 120, .

2, the driving motor 140 includes an inner rotor 40 connected to the outer shaft 20, an outer rotor 50 connected to the inner shaft 30, an inner rotor 40, And a stator 60 disposed with an air gap between the outer rotor 50 and rotating the inner rotor 40 and the outer rotor 50. The stator 60 has a double stator structure that independently drives the inner rotor 40 and the outer rotor 50.

4A so that the inner rotor 40 and the outer rotor 50 can be selectively / independently driven using the first and second drivers 530 and 540 shown in FIG. 6, (60b) and an inner stator (60a). In the following description of the embodiment, an outer stator and an inner stator are integrally formed, but they may be separated from each other.

The outer shaft 20 is rotatably coupled to the outer periphery of the inner shaft 30 and includes a first shaft 22 having one end connected to the center of the inner rotor 40, And a second shaft (24) coupled to the washing tub (120) at the other end. In this case, the first shaft 22 and the second shaft 24 may be integrally formed.

A first sleeve bearing 80 in the form of a cylinder is provided between the outer circumferential surface of the inner shaft 30 and the inner circumferential surface of the first shaft 22. A second sleeve bearing 82 is provided on the inner surface of the upper end of the second shaft 24 And rotatably supports the inner shaft 30.

A first connecting portion 90 is formed on an outer surface of the first shaft 22 to connect the inner rotor support 46 of the inner rotor 40 through a bushing 48. A lower end of the inner shaft 30, A second connection portion 92 is formed in which the outer rotor support body 56 of the second rotor 50 is connected via the bushing 58. [

The first connection portion 90 and the second connection portion 92 may have a structure serration-coupled or spline-coupled by protrusions formed on the outer surface of the outer shaft 20 and the inner shaft 30, And may have a structure that is key-coupled with each other.

A first fixing nut 34 is screwed to the lower end of the outer shaft 20 to prevent the inner rotor support 46 from being detached from the outer shaft 20, A second fixing nut 36 for preventing the outer rotor support 56 of the rotor 50 from being detached is screwed.

A third connection portion 94 to which the washing tub 120 is connected and a fourth connection portion 96 to which the pulsator 130 is connected to the upper outer surface of the inner shaft 30, .

The third connection portion 94 and the fourth connection portion 96 may have a structure serration-coupled or spline-coupled by protrusions formed on the outer surface of the second shaft 22 and the inner shaft 30, So that they can be key-coupled with each other.

A first seal 220 is mounted between the second shaft 22 and the inner shaft 30 to prevent wash water from leaking. The second seal 221 is mounted.

A first bearing 26 is disposed on the outer surface of the first shaft 22 and a second bearing 28 is disposed on the outer surface of the second shaft 24 so that the first and second shafts 22, Rotatably.

The first bearing 26 is installed in the first bearing housing 102 and the second bearing 28 is installed in the second bearing housing 10.

The first bearing housing 102 is formed to extend inward from the stator support body 270 and has a first bearing seating portion 104 on the inner surface thereof on which the first bearing is seated.

The second bearing housing 10 is made of a metal material and has a second bearing seating portion 12 on which the second bearing 28 is seated and a second bearing seating portion 12 extending outwardly from the second bearing seating portion 12, A second seal fixing part 14 to which the first seal fixing part 221 is fixed, a connection part 16 which is bent in a downward direction in a downward direction and forms a cylindrical shape, And a flat plate portion 18 extended to be fixed to the outer tub 110. The flat plate portion 18 is fixed to the stator support body 270 and the outer tank 110 by bolts 260.

The center portion of the second bearing housing 10 protrudes through the opening of the outer tub 110 and the flat portion 18 of the outer tub 110 protrudes from the outer tub 110, And the stator support body 270 is stacked on the second bearing housing 10 and then is fastened to the outer tub 110 by one bolt 260. [

In the present invention, the washing tub 120 and the pulsator 130 are rotated simultaneously or selectively and in the same or opposite directions by the driving motor 140 of the bipotal force structure constituted by the double rotor- It is possible to form washing water in various ways.

Hereinafter, a driving motor 140 having a dual-power structure including a double rotor-double stator will be described in detail with reference to FIGS. 2 to 4C.

The driving motor 140 includes an outer rotor 50, an inner rotor 40 and a stator 60. The stator 60 selectively and independently rotates the outer rotor 50 and the inner rotor 40 And an outer stator 60b and an inner stator 60a so as to be driven. 4A, the outer stator and the inner stator may be integrally formed or separated from each other.

2, the inner rotor 40 includes a plurality of first magnets 42 arranged at regular intervals on the inner surface of the stator 60 and having N poles and S poles alternately arranged, A first back yoke 44 disposed on the rear surface of the first magnet 42 and an inner rotor support 46 formed integrally with the first magnet 42 and the first back yoke 44 by insert molding, .

Here, the inner rotor support 46 is molded with a thermosetting resin, for example, a BMC (Bulk Molding Compound) molding material such as polyester or a thermoplastic resin, and the first magnet 42 and the first back yoke 44 .

The inner rotor support body 46 has an inner end connected to the first connection portion 90 of the first shaft 22 through the first bushing 48 and an outer end bent at a right angle so that the first magnet 42 And the first back yoke 44 are fixed and have a cup shape.

Accordingly, when the inner rotor 40 is rotated, the first and second shafts 22 and 24 are rotated, and the rotational force of the inner rotor 40 is transmitted to the washing tub 120. [

The inner rotor 40 has a smaller diameter and a smaller drive torque than the outer rotor 50. Therefore, as will be described later, when the pulsator and the washing tank are rotated strongly in the opposite directions to form a three-dimensional three-dimensional washing water stream having three degrees, the inner rotor 40 that drives the washing tub 120 has a high magnetic flux density A rare earth-based magnet such as a neodymium (Nd) magnet is employed to increase the driving torque.

When the washing tub 120 is filled with a large amount of laundry and water, the initial starting current may be excessively consumed due to the initial startup, resulting in a reduction in efficiency. However, such problem is not caused by increasing the driving torque of the inner rotor .

The outer rotor 50 includes a plurality of second magnets 52 disposed on the outer surface of the stator 60 with a predetermined gap therebetween and having N poles and S poles alternately arranged, And an outer rotor support body 56 integrally formed with the second magnet 52 and the second back yoke 54 by insert molding.

Here, the outer rotor support body 56 is molded with a thermosetting resin, for example, a BMC (Bulk Molding Compound) molding material such as polyester or a thermoplastic resin, and is integrally formed with the second magnet 52 and the second back yoke 54 .

The outer rotor support 56 has an inner end connected to the second connecting portion 92 of the inner shaft 30 and rotated as the inner shaft 30 and the outer end is bent at right angles to form a second magnet 52 And a second back yoke 54 are fixed and cup-shaped to accommodate the stator 60 and the inner rotor 40.

Here, the pulsator 130 can rotate sufficiently by the outer rotor 50 having a large driving torque, which is not large as compared with the washing tub 120, and is large in diameter. Accordingly, the second magnet 52 of the outer rotor 50 may be made of hard ferrite, which is inexpensive and hard magnetic material.

The outer rotor 50 also takes into account the thickness of the first fastening nut 34 screwed to secure the inner rotor support 46 to the first shaft 22, The outer rotor support body 56 is spaced apart from the inner rotor support body 46 by a greater distance than the first fixing nut 34. [

The outer rotor support body 56 includes an outer flat portion 56a opposed to the inner and outer stator coils 66 and 68 in a cup-shaped bottom surface and an inner flat portion 56a joined to the inner shaft 30 And an inclined connecting portion 56c connecting the outer flat portion 56a and the inner flat portion 56b.

A plurality of radially reinforcing ribs 51 and 51a are projected radially at predetermined angles on the outer and inner circumferential surfaces so as to maintain strength while being thin, and inner circumferential surfaces of the first through third circumferential reinforcing ribs 53a through 53c are formed, Are formed at intervals in the circumferential direction.

The outer rotor support 56 includes first and second through holes 55 which communicate with the outer side of the inner rotor 61 and the outer flat portion 56a which faces the inner stator coil 66 and the outer stator coil 68 constituting the stator 60, And 57 are formed. The first and second through holes 55 and 57 serve as an air circulation passage for discharging heat generated from the inner and outer stator coils 66 and 68 to the outside.

Hereinafter, the stator of the present invention will be described.

4A to 4C, the stator 60 includes a plurality of stator core assemblies 61 arranged in an annular shape, a plurality of stator core assemblies 61 arranged in an annular shape and an outer peripheral portion fixed to the outer tank 110 And a stator support body 270 (see Fig. 2) in which a through hole is formed. The plurality of stator core assemblies 61 includes a split stator core 62 that is annularly arranged and coupled to each other as shown in Figs. 4A and 4B, and a stator core 62 that is formed of an insulating material on the outer surface of the split stator core 62 (Inner side) bobbin of the stator core 62 and an inner stator coil 66 wound on one side (inner side) bobbin of the stator core 62 and the other side (outer side) bobbin 64 of the stator core 62, And an outer stator coil 68 wound on the outer stator coil 68.

The stator support body 270 is integrally formed with a plurality of stator core assemblies 61 by insert molding after annularly arranging a plurality of stator core assemblies 61 in a circumferential direction in the mold. A stator core assembly 61 is disposed in the middle of the stator support body 270. The inside of the stator support body 270 is bent in two stages to form a first bearing housing 102, (Not shown).

Since the first bearing 26 is installed in the first bearing seating portion 104, the outer shaft 20 can be rotatably supported, the assembling performance of the driving motor 140 can be improved, A separate bearing housing for mounting the bearing 26 is unnecessary, so that the number of parts can be reduced and the structure can be simplified.

The outer circumferential portion of the stator support body 270 is bent in one step and then the tip end portion thereof is fixed to the outer tub 110 by the bolts 260 together with the second bearing housing 10. [

The stator support body 270 may be manufactured separately from the stator core assembly 61 by using a resin or a metal material and may be formed separately from the stator support body 270 and the bolt The fastening structure can also be applied.

The stator 60 according to the present invention includes a plurality of stator core assemblies 61 configured by using a plurality of divided stator cores as shown in FIG. 4B, .

In the description of the embodiment shown in FIG. 4A, the stator core in which the inner and outer stator coils 66 and 68 are wound is constituted by a plurality of divided stator cores 62 interconnected by being arranged in an annular shape, The present invention is not limited thereto and it is also possible that the stator core is constituted by an integral or partly split core.

The split-type stator core 62 has an advantage that the coil winding can be easily manufactured at a low cost by using a low-cost general-purpose winding machine as compared with the integral stator core, and it is possible to reduce the loss of the core material.

In the illustrated embodiment, the split-type stator core may be used for each tooth, or several teeth, for example, three teeth may be fabricated from one split-type stator core and assembled. Particularly, in a BLDC motor of a U, V, W three-phase driving system, in the case of winding a coil in consecutive three teeth with respect to any one of U, V and W phases, .

The split-type stator core 62 includes a first tooth portion 312 disposed on the outer side and wound with an outer stator coil 66 as shown in Figs. 4A to 4C, and a second tooth portion 312 on the inner side of the first tooth portion 312, A second tooth portion 310 having an inner stator coil 68 wound therearound and a partition portion 314 for partitioning the first tooth portion 312 and the second tooth portion 310 and a partition portion 314 And coupling portions 320 and 322 formed at both lateral ends of the divided stator core 62 to interconnect the divided stator cores 62. [

The stator 60 of the present invention is configured such that the outer stator coil 68 wound around the first tooth portion 312 of the stator core 62 to drive the outer rotor 50 and the inner rotor 40 is connected to the outer stator 60b And the inner stator coil 66 wound around the second tooth portion 310 of the stator core 62 constitutes an inner stator 60a to form a double stator.

4A to 4C illustrate that the core is divided into a plurality of divided stator cores 62 for each slot, but the stator cores 62 are separated from each other by the annular back yoke, It is possible to manufacture the stator core for the core and the stator core for the inner stator separately and then to assemble.

6, an inner stator coil 66 constituting the inner stator 60a and an outer stator coil 68 constituting the outer stator 60b form drive signals from the first and second drivers 530 and 540, And the outer rotor 50 and the inner rotor 40 are driven respectively.

Since the first driving signal is applied to the inner stator coil 66 and the second driving signal is applied to the outer stator coil 68, if the driving signal is applied only to the inner stator coil 66, When only a driving signal is applied to the outer stator coil 68, only the outer rotor 40 is rotated. When a driving signal is simultaneously applied to the inner and outer stator coils 66 and 68, the inner rotor 40 and the outer rotor 40 are rotated, The rotor 50 is simultaneously rotated.

A through hole 332 may be formed at the center of the partition 314 and may be used for bolt tightening to integrate with the stator support body 270.

A first flange portion 318 is disposed at the end of the first tooth portion 312 so as to face the first magnet 52 and a second flange portion 318 is formed at the end of the second tooth portion 310. [ The second flange portion 316 is disposed opposite to the second flange portion 316. [

The first flange 318 and the second flange 316 are disposed inward and outward at a predetermined curvature corresponding to the first magnet 52 of the outer rotor 50 and the second magnet 42 of the inner rotor 40, It forms an outward curved surface. Therefore, since the roundness of the inner and outer circumferential surfaces of the stator core 62 is increased, the inner and outer circumferential surfaces of the stator 60 and the first and second magnets 52 and 42 are close to each other and have a constant magnetic gap. Lt; / RTI >

The stator cores 62 should be directly connected to each other so as to form a magnetic circuit. Accordingly, the engaging portions 320 and 322 have a structure in which adjacent stator cores 62 are directly connected to each other.

The coupling protrusions 322 are formed on one side of the partition 314 and the coupling protrusions 322 are formed on the other side of the partition 314, A plurality of divided stator cores 62 are arranged in an annular shape and have a structure directly connected to each other when the engaging projections 322 are fitted into the engaging grooves 320. [

The driving motor 140 of the present invention forms the first magnetic circuit L1 between the inner rotor 40 and one side of the stator 60 wound with the inner stator coil 66 (i.e., the inner stator) The second magnetic circuit L2 is formed between the outer rotor 50 and the other side (i.e., the outer stator) of the stator 60 wound with the outer stator coil 68 to form independent magnetic circuits, 40 and the outer rotor 50 may be separately driven.

Specifically, the first magnetic circuit L1 includes a first tooth portion 310 to which the N-pole first magnet 42, the inner stator coil 66 are wound, an inner portion of the partition portion 314, And passes through the first magnet 42 and the first back yoke 44 of the S pole adjacent to the first magnet 42.

The second magnetic circuit L2 includes a second magnet 52 having an N pole, a second tooth portion 312 facing the N magnet second magnet 52 and wound with the outer stator coil 68, The second magnet 52 and the second back yoke 54 of the S pole.

However, since the first and second magnetic circuits L1 and L2 are formed by inserting the inner and outer stator coils 66 and 68 wound on the first and second tooth portions 310 and 312 in U, V, and W phases V, and W phases for each of three teeth, a two-winding coil method in which U, V, and W phases are alternately wound for each of two teeth, But may be changed depending on the three-winding coil method and the driving method which are differently wound.

The driving motor 140 according to the embodiment has a structure in which the output of the inner rotor 40 is transmitted to the outer shaft 20 and the output of the outer rotor 50 is transmitted to the inner shaft 30.

In the fully automatic washing machine, a larger high torque driving is required to drive the washing tub 120 having a large contact area with the laundry and the washing water than the pulsator 130 having a small contact area with the laundry and the washing water.

In addition, generally, the outer rotor 50 having a large diameter has a higher torque output than the inner rotor 40 having a small diameter.

Therefore, the washing machine driving apparatus 150 using the driving motor 140 according to the present invention shown in FIG. 2 can control the high torque output generated from the large diameter outer rotor 50 to the inner shaft 30, To the pulsator 130 to drive the pulsator 130 and the small diameter inner rotor 40 employs a rare earth magnet having a high magnetic flux density so that the driving torque of the inner rotor And the washing tub 120 is driven through the outer shaft 20, the washing tub which requires a large driving torque at the beginning can be smoothly driven.

In the following experiments, a ferrite magnet is used for the outer rotor 50 and a ferrite magnet is used for the inner rotor 40 of a small diameter as shown in the following Table 1 for the drive motor 140 shown in Fig. In the case of using ferrite magnets of the same type as the outer rotor and Nd magnets, the motor characteristic values were obtained when the rotation speed of the rotor was 200 rpm.

For the inner rotor using the ferrite magnet, the outer rotor using the ferrite magnet, and the inner rotor using the Nd magnet, the values of the torque and the efficiency are obtained when the rotation speed of the rotor is 120 rpm, and are shown graphically in FIG.

Number of stator slots - 27 Rotor Fouls - 24 Core lamination mm 27 Inner rotor
(Ferrite magnets) Inner rotor
(Nd magnet) Outer rotor
(Ferrite magnets) Coil diameter / number of turns - 0.65 / 130 0.65 / 180 Winding resistance R_LL (mH) [Ω] 15.7 23.9 Winding inductance L_LL [mH] 93 217 Motor constant Km 0.65 1.18 1.39 Torque constant Kt 3.15 5.73 8.31 Back EMF @ 200rpm E_ph [V] 22 40 58

As shown in Table 1, the number of slots of the inner stator 60a and the outer stator 60b is equal to 27, and the number of poles of the inner rotor 40 and the outer rotor 50 is equally 24, the core lamination is 27 mm, and the inner side and the outer side are set to be the same, but the coil wound around the stator core is wound with the 0.60 mm diameter wire 130 times in the inner stator 60a, Respectively.

A large difference occurs between the winding resistance and the winding inductance of the inner stator 60a and the outer stator 60b and in the inner rotor 40 motor and the outer rotor 50 motor using the same ferrite magnets, ) Were 22V and 58V, respectively. However, in the inner rotor 40 using the Nd magnet, Back EMF (200 rpm) was generated at 40 V and increased 1.8 times as compared with the inner rotor 40 using the ferrite magnet.

As described above, since the torque of each phase in the BLDC motor is proportional to the product of the back electromotive force (Back EMF) and the current, the inner rotor 40 using the Nd magnet has a larger torque than the inner rotor using the ferrite magnet.

It can be seen that both the torque constant Kt and the motor constant Km are proportional to the back EMF (counter electromotive force) and that the inner rotor 40 using the Nd magnet exhibits superior motor characteristics than the inner rotor using ferrite magnets.

5, the inner rotor 40 using the Nd magnet exhibits almost the same efficiency as the outer rotor 50 using the ferrite magnet when the torque value is the same, while the inner rotor 40 using the ferrite magnet It can be seen that the efficiency is very low.

Accordingly, in the present invention, since the Nd magnet is used for the inner rotor 40, torque and efficiency equal to those of the outer rotor 50 using the ferrite magnets are obtained. Therefore, at the time of washing and rinsing, 120 can also be used to form a variety of laundry and rinse streams.

4A to 4C, after the stator 60 has prepared a plurality of stator core assemblies 61 using a plurality of divided stator cores 62, a plurality of stator core assemblies 61 The outer stator and the inner stator are formed to have the same number of slots by being coupled with the stator support body 270. However, the present invention is not limited thereto and various modifications are possible.

Hereinafter, a control method of the washing machine according to the present invention will be described with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a block circuit diagram of a washing machine control apparatus according to the present invention, and FIG. 7 is a flowchart briefly showing an overall washing machine control method according to the present invention.

6, the controller of the washing machine according to the present invention includes a first driver 530 for generating a first driving signal applied to an inner stator coil 66 wound around an inner stator core 310, A second driver 540 for generating a second driving signal to be applied to the outer stator coil 68 wound on the first and second drivers 530 and 540, And a control unit 500.

The control unit 500 controls the first and second drivers 530 and 540 as described above and controls the entire washing machine as a system controller. Alternatively, the control unit 500 may control the first and second drivers 530 and 540 according to the laundry course set by the user And a controller dedicated to the driver to apply the control signals to the first and second drivers 530 and 540 based on the received wash control signal. The control unit 500 may be a signal processing device such as a microcomputer or a microprocessor, and may include a PWM control unit or may be separately provided to generate a PWM (Pulse Width Modulation) control signal.

As described above, the driving motor 140 of the present invention is composed of a BLDC motor having a biaxial-force structure composed of a double rotor-double stator. For example, motor control is performed by a U, V, W three-phase driving method. Therefore, the inner and outer stator coils 66 and 68 of the stator 60 are also composed of U, V, and W three-phase coils, respectively.

The stator 60 of the present invention includes an inner stator 60a having an inner stator coil 66 to drive the inner rotor 40 and the outer rotor 50 respectively and an outer stator 60a having an outer stator coil 68, (60b).

As a result, the inner stator 60a and the inner rotor 40 rotated by the inner stator 60a form an inner motor, and the outer stator 60b and the outer stator 60b, which are rotated by the outer stator 60b, The rotor 50 forms an outer motor, and the motor structure is designed such that the inner motor and the outer motor are controlled by the BLDC method, respectively. In the first and second drivers 530 and 540, Drive control is performed.

The first and second drivers 530 and 540 may be composed of inverters composed of three pairs of switching transistors connected to each other in a totem pole structure. The U, V, and W three-phase outputs of the inverters are connected to inner and outer stator coils Phase coils of U, V, W of FIG.

The control unit 500 is based on the rotational position of the inner rotor 40 and the outer rotor 50 detected from the first and second rotor position detection sensors 510 and 520, The first and second drivers 530 and 540 receive the control signals to apply the U, V, and W three-phase outputs to the inner and outer coils 66 and 66, respectively, Phase coils of U, V, and W, respectively, to rotate the inner rotor 40 and the outer rotor 50 in rotation.

The control unit 500 has a program for executing various washing courses in the memory device, and all the washing courses basically include a washing cycle, a rinsing cycle, and a dewatering cycle. In addition, And at least one of a washing cycle, a rinsing cycle, and a dewatering cycle is repeated a plurality of times according to a washing course.

The operation of the washing machine according to the present invention thus constructed will be described below with reference to Fig.

Referring to FIG. 7, the washing machine according to the present invention is first turned on in step S200.

In this state, the control unit 500 determines whether to perform the current washing or rinsing cycle through the input washing control signal according to the user's selection (S202).

As a result of the determination, when the laundry or rinse cycle is performed, the control unit 500 detects the weight (load amount) of laundry (not shown), sets a water level according to the weight Start.

In addition, the washing and drying step is set according to the laundry course set by the user depending on the weight (load amount) of the laundry and the type of the laundry. When the set water supply is completed and the washing and drying step is set, the set washing cycle is started.

That is, the inverter of the first driver 530 and the second driver 540 is driven according to the set washing or rinsing cycle (S204).

The first driver 530 and the second driver 540 selectively and independently generate three-phase AC power and the generated three-phase AC power is supplied to the inner stator coil 66 and the outer stator 60 of the stator 60, As it is applied to the coil 68, it is driven by any one of various washing courses to be washed. The washing or rinsing cycle is repeated a number of times according to various washing courses, and a washing cycle can be performed by combining various washing water streams.

A washing method using the double rotor-double stator type driving motor 140 will be described in detail below.

Thereafter, the control unit 500 determines whether or not the current dehydration stroke is performed in a state where all the rotors are stopped, or if the dehydration stroke is not performed in the washing or rinsing stroke in the step S202 (S208).

The control unit 500 controls the inner rotor 40 to rotate only the inner rotor 40 or the outer rotor 50 in the same direction or the same RPM, 1 driver 530 and the second driver 540 to apply the same driving signal to the inner stator coil 66 and the outer stator coil 68. [ The rotational force of the inner rotor 40 and the outer rotor 50 generated thereby is transmitted to the washing tub 120 and the pulsator 130 through the outer shaft 20 and the inner shaft 30, To perform a dewatering process (S212).

Then, the control unit 500 determines whether or not the execution time of the dewatering process has elapsed (S214), and terminates the washing operation of the laundry when the dewatering cycle time has elapsed.

The washing or rinsing cycle according to the present invention will now be described in further detail.

When performing a washing or rinsing cycle, the control unit 500 drives the inverters of the first driver 530 and the second driver 540 according to a washing or rinsing cycle.

The first driver 530 and the second driver 540 generate three-phase AC power and the generated three-phase AC power is supplied to the inner stator coil 66 and the outer stator coil 68 of the stator 60, As shown in FIG. The outputs of the inner rotor 40 and the outer rotor 50 driven by the inner stator coil 66 and the outer stator coil 68 of the stator 60 each provide a rotational force having similar high torque characteristics.

When the three-phase AC power is applied from the first driver 530 to the inner stator coil 66 of the inner stator 60a, the inner rotor 40 is rotated and the inner rotor 40 Is transmitted to the outer shaft 20 connected to the inner rotor 40. [

In the present invention, the inner rotor 40 and the outer rotor 50 of the drive motor 40 are rotatable in both directions, and the first and second bearings 26 and 28 and the first and second sleeve bearings 80 and 80, The rotation direction and rotation speed of the pulsator 130 and the washing tub 120 can be variously controlled and various washing water flows can be formed.

In particular, when the pulsator 130 and the washing tub 120 are driven in different directions (opposite directions), different speeds, and different cycles, strong washing water of various patterns can be formed using the minimum energy.

The method of forming counter-direction washing water according to the present invention basically comprises rotating the pulsator 130 in one direction, for example, in the forward direction, that is, in the clockwise direction (CW) by driving the outer rotor 50, After the motor ON time (ON TIME) is maintained for the set time, it has a predetermined stop time (OFF TIME) for switching the direction.

In this case, depending on how quickly the rotational speed of the pulsator 130 is raised to, for example, 160 RPM, the target RPM is rapidly rotated in conjunction with the laundry and the washing water. As shown in FIGS. 9 to 11, when the laundry is rapidly increased within a short time, strong water is generated to apply a large frictional force to the laundry. If the rotation speed is gradually increased as shown in FIG. 12, wool) can be applied.

The method of raising the outer rotor 50 to the target RPM of 160 RPM includes an overshooting drive as shown in FIG. 9, a sequential starting method of gradually increasing the RPM according to the time shown in FIG. 10, a multi- One of the starting methods such as ramp-up driving can be applied.

In the present invention, after the pulsator 130 is rotated for at least 2.5 seconds, the outer rotor 50 is stopped so as to have a predetermined OFF time for switching the direction (OFF TIME).

The method of stopping the outer rotor 50 can be selected from a method of stopping the driving power to the outer stator by stopping it and a method of performing the electromagnetic brake to the outer rotor 50 by using the second driver 540 have.

In this case, when the electromagnetic brake is applied to the outer rotor 50 using the second driver 540 so that the pulsator 130 is stopped as quickly as possible, A mixture of laundry and detergent can be made and at the same time a strong three-dimensional solid stream is formed.

Meanwhile, the washing tub 120, which is driven in reverse by the inner rotor 40, is driven at a different cycle than that of the pulsator 130. The washing tub 120 remains stopped until the driving time of the pulsator 130, that is, the motor ON time (ON TIME), is terminated. However, before the pulsator 130 is completely driven, The driving of the pulsator 130 is performed for a short period of time after the driving of the pulsator 130 is completed.

In this case, the reverse rotation of the inner rotor 40 for rotating the washing tub 120 in the reverse direction is minimized, for example, driving is performed at (-) 50 RPM.

As described above, if the pulsator 130 is driven in the forward direction (CW), that is, in the clockwise direction (CW) for a predetermined period by driving the outer rotor 50 by the outer stator 60b, And the washing water is rotated, and a water-like flow is generated in which the water rises from the wall surface of the washing tub 120 due to the centrifugal force and falls to the center. When the laundry and the washing water are moved and rotated, the laundry and the detergent are mixed and washed by the frictional force and the position energy.

If the pulsator 130 is rotated at a constant speed for a predetermined period and then the driving power to the outer stator is cut off or the electromagnetic brake is applied to stop the laundry, the laundry and the washing water are continuously rotated for a short time due to inertia .

In this case, if the reverse rotation of the inner rotor 40 is performed for a short period of time until the pulsator 130 is started and the pulsator 130 is driven, the washing tub 120 is also rotated in the reverse direction And generates a second water flow flowing in a reverse direction, that is, in a counterclockwise direction (CCW) along the inner wall surface of the washing tub 120. As a result, a large vortex is generated as the first water flow in the circumferential direction and the second water flow in the reverse direction (CCW) due to the reverse rotation drive of the washing tub 120 collide with each other in the forward direction (CW) .

In the present invention, although the reverse drive of the inner rotor 40 is driven for about one second with a minimum drive period and RPM, for example, (-) 50 RPM in order to minimize energy consumption, / Descending first water stream in the first direction and the second water stream in the second direction caused by the washing tub collide with each other and vortex is generated, thereby making it possible to form a highly clean water stream while minimizing energy consumption.

The large vortices generated by the reciprocal drive in this way form a strong three-dimensional three-dimensional washing water stream which is three degrees higher.

Then, the pulsator 130 is driven to rotate counterclockwise (CCW) for the opposite direction driving after having the predetermined stop time (OFF TIME), and the motor ON time (ON TIME) The washing tub 120 is started before the reverse driving of the pulsator 130 is finished and the washing tub 120 is operated for a short period of time after the pulsator 130 is stopped While rotating in the clockwise direction (CCW), a large vortex having three orders of magnitude is generated by mutually opposite directions.

One cycle is completed when the pulsator 130 is driven in the clockwise direction (CCW) and the counterclockwise direction (CCW) is completed, the two cycles are driven in the same manner as the one cycle described above, Forming method can be combined and proceeded.

In the present invention, the motor ON time (ON TIME) may be set in the range of 2.5 seconds to 10 seconds, and the OFF time may be set in the range of 0.5 seconds to 2.0 seconds, for example.

Hereinafter, a method of forming a reciprocal direction washing water using a bi-directional force according to the present invention will be described in detail with reference to FIGS. 8A and 8B.

8A and 8B, the control unit 500 drives the second driver 540 to apply the three-phase AC power to the outer stator coil 68 to rotate the outer rotor 50 in the forward direction, that is, The pulsator 130 is rotated in the forward direction by rotating in the direction CW (S81).

The method of rotating the outer rotor 50 at a predetermined RPM, for example, 160 RPM includes the overshooting drive as shown in FIG. 9, the sequential starting method of gradually increasing the RPM according to the time shown in FIG. 10, One of the starting methods such as ramp-up driving can be applied.

Thereafter, the rotation speed of the outer rotor 50 (i.e., the pulsator) is maintained at 160 RPM for a predetermined first time T1 (S82). When the pulsator 130 is rotated in one direction, the laundry and the washing water in the washing tub 120 are rotated, and the wall surface of the washing tub 120 is lifted by the centrifugal force and then descended (free fall) As the waterfall type movement is performed, the laundry is repeatedly rotated and freely dropped, and the laundry is washed by free fall due to frictional force and potential energy.

If the predetermined first time T1 elapses, the control unit 500 drives the first driver 530 to apply the three-phase AC power to the inner stator coil 66, (-) to 50 RPM in the counterclockwise direction (CCW) (S83) by rotating the washing tub 120 in the reverse direction.

As a result, the first water flow in the forward direction (CW) and the second water flow in the reverse direction (CCW) due to the driving of the washing tub (120) in the circumferential direction and the second water flow in accordance with the driving of the pulsator 130 are generated. The large vortices generated by the reciprocal drive in this way form a strong three-dimensional three-dimensional washing water stream which is three degrees higher.

In general, since the washing tub is filled with a lot of laundry and water and has a large weight and volume as compared with the pulsator, high torque driving is required at the initial stage, and since the inner rotor driving the washing tub is disposed inside the outer rotor, The drive torque is smaller than that of the rotor.

In the present invention, instead of using an expensive planetary gear device for increasing the torque with respect to the inner rotor 40 having a small diameter, a magnet used for the inner rotor and a rare earth magnet having a high magnetic flux density are employed, The torque can be increased and the washing tub 120 can be smoothly driven through the outer shaft 20. [

Thereafter, it is determined whether the turn-on time of the outer rotor 50, that is, the ON time (ON time) of the outer rotor, which has been set in advance in the forward (CW) rotation of the pulsator 130 has elapsed (S84).

If the ON time (ON TIME) of the outer rotor has elapsed, the flow goes to step S85 to stop the outer rotor 50 to stop the pulsator 130.

In the present invention, even when the pulsator 130 is stopped by interrupting the driving of the outer rotor 50, when the outer rotor is set to the electromagnetic brake or freewheeling state, the outer rotor is rotated for a predetermined time by the inertial force, The vortex generation continues while the inner rotor 40 is rotating in the reverse direction.

As described above, even when the pulsator 130 is stopped by interrupting the driving of the outer rotor 50, reverse rotation is applied to the inner rotor 40 to minimize energy consumption, Effect can be obtained.

Then, it is determined whether the turn-on time of the inner rotor 40, that is, the ON time (ON time) of the inner rotor has elapsed (S86). If it is determined that the ON time (ON TIME) of the inner rotor has elapsed, the process proceeds to step S87 for stopping the inner rotor 40 to stop the washing tub 120. [

Then, it is determined whether a preset stop time of the outer rotor 50 has elapsed (S88).

As a result of the determination, if the preset motor stop time has elapsed, the procedure for rotating the pulsator 130 in the CCW direction and rotating the washing tub 120 in the forward direction (CW) (S89 to S97), as opposed to step S88.

If it is determined in step S97 that the pre-set stop time has elapsed, it is determined whether or not a for-release stroke is scheduled (S98). If the for-release stroke is scheduled, the process proceeds to step S99, Go ahead.

If the washing water is generated by mutual opposing driving using the bi-motive force, the twisting may occur. Therefore, when the formation is detected or the formation is predicted, the forging process is carried out. The unwinding step loosens the laundry by rotating the pulsator 130 and the washing tub 120 at the same speed in the same direction.

The above-described washing cycle is completed by one cycle of washing cycle including steps S81 to S97, and the two cycle cycles of the washing cycle are the same as the one cycle described above, The washing water flow forming method of the present invention can be performed in combination.

When the washing time has ended, the washing cycle is terminated and the process proceeds to the next process cycle. If the washing cycle has not been completed, the process proceeds to step S81, Repeat the procedure.

In the following embodiments, a description will be given of a method of forming mutually oppositely directed washing water using the bi-motive force of the washing machine driving apparatus 150 according to the present invention with reference to RPM timing charts of the pulsator and the washing tub of Figs.

(Example 1)

Referring to the RPM timing diagram of the pulsator and the washing tank for forming the countercurrent washing water in the mutually opposite directions in FIG. 9, the method for forming the countercurrent washing water in the opposite direction according to the first embodiment of the present invention basically includes the step of rotating the pulsator 130 in one direction, For example, it has a predetermined stop time (OFF TIME) for turning the motor in the forward direction, that is, in the clockwise direction (CW) and maintaining the motor ON time (ON TIME) for a predetermined time.

9 shows the RPM of the outer rotor 50 for driving the pulsator 130 and the graph S shows the inner rotor 40 for driving the spin basket 120. [ Respectively.

Thereafter, the pulsator 130 is rotationally driven in the other direction, for example, in a counterclockwise direction (CCW), maintains the motor ON time (ON TIME) for a predetermined time, And has a predetermined stop time (OFF TIME).

One cycle is completed when the pulsator 130 is driven in the clockwise direction (CCW) and the counterclockwise direction (CCW) is completed, the two cycles are driven in the same manner as the one cycle described above, Forming method can be combined and proceeded.

In the first embodiment, driving of the pulsator 130 is an example in which the motor ON time (Ton) is set to, for example, 2.9 seconds and the OFF time (Toff) is set to 1.0 second. ) Is set to about 1.2 seconds.

In the present invention, the motor ON time (ON TIME) may be set in the range of, for example, 2.5 seconds to 10 seconds, and the OFF time may be set in the range of 0.5 seconds to 2.0 seconds.

In this case, the washing tub 120 is driven at a different cycle than that of the pulsator 130. The washing tub 120 is maintained in a stopped state until the drive time of the pulsator 130, that is, the motor ON time (ON TIME), is terminated, and the rotational driving is performed in the direction opposite to the rotating direction of the pulsator 130 .

The inner rotor 40 is rotated by the first driver 530 when the outer rotor 50 is rotated by the second driver 540 in the forward direction, that is, in the clockwise direction CW, for example, at a rotational speed of 160 RPM As the electromagnetic brake is established, the outer shaft 20 and the washing tub 120, which are in a stopped state and connected thereto, are also kept stationary.

In this case, it is preferable to drive the outer rotor 50 at 200 RPM by using an overshooting method so as to strongly start the initial drive of the pulsator 130, and then decelerate to maintain the state of 160 RPM for a predetermined time.

Accordingly, when the pulsator 130 is rotated in one direction with a strong maneuvering force, the pulsator 130 is rotated strongly in conjunction with the laundry and the washing water. In the first embodiment of the present invention, when the pulsator 130 is rotated for at least 2.9 seconds and then stopped, the laundry and the washing water are continuously rotated by inertia. That is, when the electromagnetic brake is applied to the outer rotor 50 using the second driver 540 so that the pulsator 130 can be stopped as quickly as possible, the rolling of the laundry, which is located at the upper portion of the washing tub, A strong three-dimensional solid water stream is formed.

In this case, the outer rotor 50 is driven to overshoot from 160RPM to 200RPM similarly to the initial drive before stopping the pulsator 130 as needed, and then the stop is advanced to form a stronger three-dimensional solid water stream can do.

In the present invention, the washing tub 120, which was in a stopped state about 0.7 seconds before the driving time of the pulsator 130, that is, the ON-time, When the reverse rotation force is applied to the laundry and the washing water which are rotated in one direction by driving at 50 RPM, a strong vortex is generated in the laundry and the washing water. In this case, the reverse drive to the washing tub 120 continues for at least about 0.5 second after the pulsator 130 is stopped to generate the vortex.

In this case, the reverse rotation of the washing tub 120 is transmitted to the washing tub 120 through the outer shaft 20 by driving the inner rotor 40 in the direction opposite to the outer rotor 50.

As in the first embodiment, in the present invention, the rotation of the washing machine in one direction at the center with respect to laundry and washing water is driven strongly using the pulsator 130, and the washing tub 120 is driven in the reverse direction Thereby generating strong vortices as a result of inducing water in the opposite direction from the outer circumference of the laundry and the washing water. As a result, the present invention minimizes power consumption while forming the three-dimensional washing water having a strong washing power by driving the washing tub 120 to the minimum So that the washing efficiency can be increased.

(Example 2)

Referring to FIG. 10, the method of forming the opposite direction washing water according to the second embodiment is similar to the first embodiment shown in FIG.

In the first embodiment, the outer rotor 50 is overshooting driven from 160RPM to 200RPM before the start and end of the motor ON time (ON TIME), and then the motor is stopped. However, the overshooting drive is not performed in the second embodiment . Instead of driving the washing tub 120 in the direction opposite to the rotating direction of the pulsator 130 in order to generate the vapors, the sweeping operation is performed within the range of about 1 second before and during the initial operation of the motor ON time (ON TIME) The driving method is changed so that the number of occurrences is increased by one more.

That is, in the second embodiment, the pulsator 130 is rotated in the forward direction at 160 RPM and the inner rotor 40 is driven in the reverse direction for 1.2 seconds in accordance with the driving of the outer rotor 50 to rotate the washing tub 120 in the reverse direction at 50 RPM Similarly to the first embodiment, the rotation of the inner rotor 40 starts 0.7 seconds before the end of the ON time of the outer rotor 50, and extends for 0.5 seconds after the end of the motor ON time (ON TIME) In the reverse direction for 1.2 seconds to rotate the washing tub 120 in the reverse direction at 50 RPM.

In the first embodiment, the electromagnetic brake is applied in a state of deceleration of 120RPM, 80RPM, and 40RPM by deceleration by 40RPM every 0.1 seconds at 160RPM at the time of stopping the drive of the outer rotor 50 for the change of direction, , The electronic brake is applied in a state of decelerating by 60RPM and 50RPM every 0.1 sec and decelerating to 100RPM and 50RPM.

In the first embodiment, since the electronic brake is applied in a state where the speed is reduced from 160 RPM to 40 RPM over 0.3 seconds, the OFF time is allocated to 1.0 second. In the second embodiment, the speed is reduced from 160 RPM to 0.2 RPM Since the brake is applied, the stop time (OFF TIME) is assigned for 1.1 seconds. That is, it is desirable to set the OFF time relatively longer when driving the outer rotor 50 abruptly.

In the method of forming mutually oppositely directed washing water according to the second embodiment, after the one cycle washing cycle of the forward rotation, the stop, the reverse rotation and the stop of the pulsator 130 is completed, the same washing cycle as the one cycle washing cycle is performed on the washing cycle It is possible to apply it repeatedly, and it is also possible to combine different kinds of washing water streams and forging processes.

In the second embodiment, a washing water flow system in which the speed of the driving RPM of the pulsator 130 of the motor on time (ON time) is changed during the second cycle washing cycle after the one cycle washing cycle is completed is shown.

The rotation speed of the outer rotor 50 for driving the pulsator 130 is reduced from 160RPM to 110RPM and then the speed control is applied to increase the rotation speed to 160RPM So that it is possible to generate a washing water such as a wave which is pushed at regular intervals.

The remaining parts of the method for forming the opposite direction washing water according to the second embodiment are the same as those of the first embodiment, and a description thereof will be omitted.

(Example 3)

Referring to FIG. 11, the method of forming the washing water in mutually opposite directions according to the third embodiment is similar to the first and second embodiments as a whole.

The difference between the first embodiment and the second embodiment and the third embodiment is that instead of driving the outer rotor 50 from 160 RPM to 200 RPM at the time of initial start and end of the motor ON time, So that the rotational speed and driving torque for driving the pulsator 130 are increased.

In addition, the RPM of the outer rotor 50 is lowered from 160 RPM to 120 RPM in the middle of the motor ON time (ON TIME), and the height is increased by inserting the speed control section Pd to generate washing water having strong power such as a large wave .

Furthermore, the motor ON time (ON time) in the third embodiment is set shorter than that in the first and second embodiments, and the OFF time is set longer. The RPM of the pulsator 130 of the motor ON time (ON TIME) is stopped at a rotation speed of 100 RPM higher than that of the first and second embodiments, and the OFF time is set to 1.8 seconds in consideration of this .

In the third embodiment, the ON time is set to 2.7 seconds, the OFF time is set to 1.8 seconds, and the operation to the washing tub 120 is set to about 1.2 seconds.

In Embodiment 3, the electronic brake is applied in a state of decelerating from 160RPM to 0.3RPM over 0.3 seconds to reach the stop state. That is, considering that the pulsator 130 RPM is stopped at a high rotation speed of 100 RPM, control is performed so as to reach a stop state while being decelerated with at least two inclined slopes.

In addition, the OFF time is also assigned to 1.8 second longer than the first and second embodiments by adding 0.5 seconds of free-wheeling and 0.3 seconds of startup preparation to the electronic brake 1.0 second. The freewheeling is to release all control so that an inertial rotation occurs after the electromagnetic brake of the pulsator 130.

As described above, according to the third embodiment, even when the motor ON time (ON time) for driving the pulsator 130 is set short, rapid stopping is performed at a high rotation speed of 100RPM, 1 and 2, the pulsator 130 rotates in the reverse direction at 50 RPM from the start before the end of drive to the end of drive.

As in the case of the third embodiment, in the present invention, the one-way rotation of the laundry and the washing water in the center is driven strongly by using the pulsator 130, and then the pulsator is suddenly braked, A strong vortex can be formed by driving the washing tub 120 in the reverse direction to induce water in the reverse direction from the outer circumference of the laundry and the washing water. As a result, according to the present invention, the driving time of the pulsator 130 is minimized, thereby making it possible to increase washing efficiency by forming a three-dimensional washing water stream having a strong washing power while minimizing power consumption.

(Example 4)

Referring to FIG. 12, the method of forming washing water in mutually opposite directions according to the fourth embodiment is generally similar to the first to third embodiments.

The difference between the fourth embodiment and the first embodiment is that the initial driving of the outer rotor 50 at the motor ON time (ON time) increases the rotational speed of the outer rotor 50 to a maximum of 200 RPM instead of the overshooting driving, Thereby increasing the rotational speed and driving torque for driving the motor 130.

In addition, when the pulsator is started at the motor ON time (ON TIME), the RPM of the outer rotor 50 is increased to a preset 200 RPM in a multi-step ramp-up manner, A strong water flow can be formed by rapidly braking in the shortest time to stop the pulsator 130 to reach a stop state.

The method of rotating the outer rotor 50 at the predetermined RPM in the fourth embodiment may be applied to one of the well-known starting methods such as the ramp-up starting described above and the sequential starting method of gradually increasing the RPM with time can do.

In the fourth embodiment, it is preferable that the OFF time is set to be longer than that of the first to third embodiments in consideration of stoppage of pulsator 130 due to sudden braking, 1.5 second and the preparation for starting 0.5 second are added, and 2.0 seconds longer than the first to third embodiments are assigned.

Furthermore, in the fourth embodiment, in consideration of the fact that the RPM of the pulse generator 130 having a higher motor ON time (ON time) than that of the third embodiment is stopped at a high rotation speed of 200 RPM, the motor ON time (ON time) The OFF time is set to 2.0 seconds, and the driving to the washing tub 120 is set to 1.2 seconds.

In the fourth embodiment, similarly to the third embodiment, the one-directional rotation of the laundry and the washing water with respect to the washing water is strongly driven using the pulsator 130, and then the pulsator is suddenly braked, A strong vortex can be formed by driving the washing tub 120 in the reverse direction to induce water in the reverse direction from the outer circumference of the laundry and the washing water. As a result, according to the present invention, strong rushing of the pulsator 130 and reverse driving of the washing tub 120 are combined to form a three-dimensional washing water stream having strong washing power, thereby improving washing efficiency.

In Example 1, the operation ratio is 74%, Example 2 is 73%, Example 3 is 60%, and Example 4 is 67%.

When the running rate of the washing machine is appropriately set by changing the ratio of the motor on time (ON time) and the stop time (OFF time) during the water flow washing, the power consumption and the degree of improvement can be improved.

In the present invention, it is desirable that the operation rate is at least 60% or more for increasing the efficiency while minimizing power consumption, and the RPM of the pulsator (outer rotor) and the RPM of the washing tank (inner rotor) are set to be larger than 3: 1.

Meanwhile, when the pulsator 130 is driven at a variable speed in the motor driving torque control and the rotation maintaining period during the washing water flow formation, rhythm water flow can be formed and energy consumption can be saved. In addition, when the rotational RPM of the pulsator 130 is varied, it is possible to use a mixture of strong, medium and weak water such as steel-> medium-> weak-> steel-> heavy- You can expect.

In the above embodiment, the electromagnetic brake is used as a stopping method of the motor for driving the pulsator and the washing tub. However, as in the third embodiment, the free-wheeling method requiring a long stopping time is combined with the electromagnetic brake It is also possible to stop by free wheeling. Further, other methods other than the electromagnetic brake can be used at the time of stopping the motor.

In addition, the present invention reduces the kink of the laundry by appropriately setting the stop time of the pulsator during the forward / reverse rotation, allows the laundry to spread evenly in the washing tub while rotating, and changes the posture and position of the laundry Improves cleaning effect.

In the present invention, the rhythm water flow can be formed by varying the rotational speed of the pulsator 130, and as a result, rhythm laundry can be realized. That is, when the rotational speed of the pulsator 130 is controlled so as to be rapidly changed, damage to the laundry can be prevented while forming strong water flow and rhythm water flow.

The control unit 500 controls the first driver 530 and the second driver 540 so that the rotational speed of the washing tub 120 and the pulsator 130 is controlled by controlling the rotation speed of the pulsator 130, By varying the voltage magnitude and the amount of current of the first drive signal and the second drive signal.

When the rotational speed of the pulsator 130 and the washing tub 120 is controlled to be moderately variable, a smooth rhythm stream can be formed and damage to the laundry can be prevented.

Although the washing machine driving method using the washing machine driving apparatus 150 according to the first embodiment using the driving motor 140 has been described in the above embodiments, the present invention is not limited to the second embodiment using the driving motor 140a The washing machine driving method using the washing machine driving device 150a according to the example may be applied in the same manner.

13, the washing machine driving apparatus 150a according to the second embodiment employing the driving motor 140a includes an outer shaft 20 connected to the washing tub 120, An inner rotor 30 connected to the pulsator 130 and an outer rotor 50 connected to the outer shaft 20; an inner rotor 40 connected to the inner shaft 30; And a stator 60 disposed with an air gap between the inner rotor 40 and the outer rotor 50.

The washing machine driving apparatus 150a according to the second embodiment differs from the washing machine driving apparatus 150 according to the first embodiment in the output structure of the rotor and accordingly the bearing supporting structure can be changed.

The structure of the drive motor 140a of the inner rotor 40, the outer rotor 50 and the stator 60 in the second embodiment is the same as that of the drive motor 140 of the first embodiment, The two bearing housings 10 are also the same as in the first embodiment.

The outer shaft 20 may be formed as a single body as in the second embodiment, or may have a coupling structure of the first and second shafts 22 and 24 as in the first embodiment.

Therefore, the same parts between the first embodiment and the second embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The difference between the first embodiment and the second embodiment is that the first bearing 26 is installed in the first bearing housing 102 separated from the stator support. However, it is also possible that the first bearing 26 is installed in the first bearing housing formed extending from the stator support similarly to the first embodiment.

The first bearing housing 102 is made of a metal material and includes a first bearing seating portion 104 on which the first bearing 26 is seated and a second bearing seating portion 104 extending outward in the first bearing seating portion 104, And a flat plate portion 108 extending outward from the upper end of the connecting portion 106 and fixed to the outer tub 110. The flat plate portion 108 is formed of a flat plate portion. The flat plate portion 108 is fixed to the outer tub 110 by the bolt 250 together with the flat plate portion 18 of the second bearing housing 10.

A first connection portion 90 is formed in the outer shaft 20 to connect the outer rotor support 56 of the outer rotor 50. A lower portion of the inner shaft 30 supports the inner rotor support 46 of the inner rotor 40 The second connection portion 92 is formed.

In this case, the first connection portion 90 is disposed at the lower portion of the first bearing 26. However, when the first bearing 26 is installed in the first bearing housing formed by extending from the stator support, 90 may be formed between the first bearing and the second bearing to reduce the overall height of the motor.

That is, when the first connecting portion 90 is disposed between the first bearing 26 and the second bearing 28, the length of the first connecting portion formed below the first bearing 26 of the conventional outer shaft The length of the washing machine motor can be reduced, thereby reducing the height of the washing machine motor.

If the height of the motor is reduced, the overall height of the washing machine can be reduced by that much, so that it is easy and convenient when the user loads the laundry in the top, and when the overall height is the same, the size of the washing tub can be increased.

The stator 60 includes a plurality of stator cores 62 arranged in a radial direction, a bobbin 64 as a non-magnetic body wrapped around the outer circumferential surface of the stator core 62, an inner stator coil 62 wound on one side of the stator core 62, An outer stator coil 68 wound on the other side of the stator core 62 and a stator support body 230 in which the stator core 62 is annularly arranged and fixed to the outer tank 110.

The stator support body 230 is integrally formed with the stator core 62 by insert molding after arranging the stator core 62 at regular intervals in the circumferential direction in the mold.

The stator support body 230 includes a core fixing portion 232 integrally formed with the stator core 62 and a connecting portion 234 extending upward from the lower end of the core fixing portion 232 and then bent at a right angle, And an outer tongue fixing part 236 which is bent at the upper side of the connecting part 234 and extends outward and is fixed to the outer tongue 110. [

Since the driving torque of the inner rotor 40 is smaller than that of the outer rotor 50 and the pulsator 130 requires a smaller torque than the washing tub 120 in the washing machine driving apparatus 150a according to the second embodiment, The inner rotor 40 can rotate the pulsator 130 sufficiently.

Accordingly, when the outer rotor 50 is rotated, the outer shaft 20 is rotated and the washing tub 120 connected to the outer shaft 20 is rotated.

The outer rotor 50 is designed to have a larger torque than the inner rotor 40 and the washing tub 120 requires a larger torque than the pulsator 130. [

The driving motor 140a according to the second embodiment is configured such that the outer rotor 50 having a large driving torque is connected to the washing tub 120 requiring a large torque and has a relatively small torque as compared with the outer rotor 50 Since the inner rotor 40 is connected to the pulsator 130 requiring a relatively small torque as compared with the washing tub, the performance of the washing machine can be improved and the current consumption can be reduced.

Further, in the present invention, a rare earth-base high magnetic force magnet such as Nd magnet is used to increase the driving torque of the inner rotor 40, so that the outer rotor and the drive torque using a low-cost ferrite magnet can be equally implemented. As a result, in the present invention, the pulsator and the washing machine can be simultaneously driven during the washing and the rinsing strokes using the bi-motive force as in the first to fourth embodiments to form various washing water streams and rinsing patterns.

In the above description of the embodiment, a BLDC motor of a double-rotor-double stator structure of a radial gap type is used as a driving power source for generating a pair of outputs. However, a BLDC motor of an axial gap double rotor- It can be used as a driving motor, and any driving motor of a different structure or other type can be used as the power source for generating a pair of outputs.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

It is possible to form a variety of washing water including the washing water in mutually opposite directions without using an expensive torque converter by using a twin driving force motor in which the driving torques of the inner rotor and the outer rotor are similar to each other The present invention can be applied to a washing machine driving apparatus and its control, particularly a fully automatic washing machine.

10: second bearing housing 12: bearing seat
14: seal seal 16,234: connection
18: flat plate portion 20: outer shaft
22: first shaft 24: second shaft
26; First bearing 28: Second bearing
30: Inner shaft 34: First fixing nut
36; Second fixing nut 40: Inner rotor
42: first magnet 44; The first back yoke
46: Inner rotor support 48, 58: Bushing
50: outer rotor 51, 51a, 53a-53c: reinforcing rib
52: second magnet 54: second back yoke

Claims (15)

A double rotor-double stator type driving motor having an inner rotor and an outer rotor independently controllable by a double stator and selectively generating an inner rotor output and an outer rotor output;
An inner shaft for transmitting the outer rotor output to the pulsator;
An outer shaft rotatably coupled to an outer periphery of the inner shaft and transmitting the output of the inner rotor to a washing tub; And
And a control unit for independently controlling the inner rotor and the outer rotor by applying the first and second driving signals independently to the double stator,
Wherein the control unit has a stop time when the pulsator switches the rotation direction in the clockwise direction and the counterclockwise direction in the washing cycle, and the washing tub is operated before the pulsator's clockwise and counterclockwise driving time ends So that driving is performed in a direction opposite to the rotational direction of the pulsator. The method according to claim 1,
Wherein the driving of the washing tub is extended after the stop time of the pulsator. The method according to claim 1,
Wherein the washing tub is driven in a direction opposite to a rotating direction of the pulsator simultaneously with the clockwise and counterclockwise starting of the pulsator, and then the driving is performed shorter than the pulsator driving time. The method according to claim 1,
Wherein the driving time and the stopping time of the pulsator are set in the range of 1.5: 1 to 10: 1. The method according to claim 1,
Wherein the overshooting driving is performed during starting and stopping operations of the pulsator. The method according to claim 1,
And the ramp-up driving is performed at the start of the pulsator. The method according to claim 1,
Wherein the pulsator is driven at a variable speed. The method according to claim 1,
Wherein the pulsator stops the electromagnetic brake by using a driver for driving the outer rotor. The method according to claim 1,
Wherein the driving torque of the inner rotor is set to be equal to the driving torque of the outer rotor. 10. The method of claim 9,
Wherein the inner rotor uses a rare earth magnet, and the outer rotor uses a ferrite magnet. The method according to claim 1,
The outer rotor
A plurality of second magnets arranged on the outer surface of the stator with a predetermined gap therebetween and having N poles and S poles alternately arranged;
A second back yoke disposed on a back surface of the second magnet; And
And an outer rotor support for supporting the second magnet and the second back yoke,
The outer rotor support
An outer flat portion facing the inner and outer stator coils of the stator in the cup-shaped bottom surface,
An inner flat portion engaged with the inner shaft,
And an inclined connection portion connecting the outer flat portion and the inner flat portion,
Wherein the outer flat portion includes first and second through holes for discharging the heat generated from the inner and outer stator coils to the outside, respectively, at portions facing the inner and outer stator coils. 13. The method of claim 12,
The outer rotor support
A plurality of radial direction reinforcing ribs protruding radially from the outer circumferential surface and the inner circumferential surface at predetermined angles, respectively; And
And the first to third circumferential direction reinforcing ribs are formed on the inner circumferential surface of the washer at intervals in the circumferential direction. A double rotor-double stator type driving motor having an inner rotor and an outer rotor independently controllable by a double stator and selectively generating an inner rotor output and an outer rotor output;
An inner shaft for transmitting the inner rotor output to the pulsator;
An outer shaft rotatably coupled to the outer periphery of the inner shaft and transmitting the outer rotor output to the washing tub; And
And a control unit for independently controlling the inner rotor and the outer rotor by applying the first and second driving signals independently to the double stator,
Wherein the control unit has a stop time when the pulsator switches the rotation direction in the clockwise direction and the counterclockwise direction in the washing cycle, and the washing tub is operated before the pulsator's clockwise and counterclockwise driving time ends So that driving is performed in a direction opposite to the rotational direction of the pulsator. An outer tub for accommodating washing water;
A washing tub which is rotatably disposed inside the outer tub to perform washing and dehydrating;
A pulsator arranged rotatably in the washing tub to form wash water; And
The washing machine according to any one of claims 1 to 13, which simultaneously or selectively drives the washing tub and pulsator. A first step of rotationally driving the pulsator in a first direction during a first period;
Rotating the washing tub in a direction opposite to the first direction for a second period before the first period ends;
A third step of stopping the pulsator according to the elapse of the first period;
A fourth step of stopping the washing tub according to the passage of the second period after the lapse of the first period; And
And a fifth step of, when the stop time of the pulsator has elapsed after the elapse of the second period of time, executing the rotation steps of the pulsator and the washing tub in the first to fourth steps, respectively, Wherein the washing machine is a washing machine.

Images