WO2017200329A1

WO2017200329A1 - Washing machine driving device, washing machine having same, and washing machine driving method

Info

Publication number: WO2017200329A1
Application number: PCT/KR2017/005197
Authority: WO
Inventors: 김병수
Original assignee: 주식회사 아모텍
Priority date: 2016-05-20
Filing date: 2017-05-19
Publication date: 2017-11-23
Also published as: CN109072530B; KR20170131092A; CN109072530A; KR101939204B1

Abstract

The present invention relates to a washing machine driving device, a washing machine having the same, and a washing machine driving method, wherein energy consumption can be minimized when washing water streams are formed in opposite directions by driving a pulsator and a washing tub in opposite directions in order to form a powerful three-dimensional washing water stream having a high degree of cleaning action. The washing machine driving device comprises: a double rotor/double stator type driving motor having an inner rotor and an outer rotor that can be independently controlled by double stators; an inner shaft for transferring an outer rotor output to the pulsator; an outer shaft for transferring an inner rotor output to the washing tub; and a control unit for controlling the inner rotor and the outer rotor, wherein the control unit has a time of stop when the pulsator switches the direction of rotation to clockwise and counterclockwise directions during a washing stroke, and the washing tub is controlled to be activated before the time of driving of the pulsator in the clockwise and counterclockwise directions ends such that driving occurs in the opposite direction to the direction of rotation of the pulsator.

Description

Washing machine driving device, washing machine and washing machine driving method

The present invention relates to a washing machine, and in particular, to form a strong three-dimensional three-dimensional washing water flow with high cleaning, which can minimize energy consumption when forming washing water flows in opposite directions by the reverse driving of the pulsator and the washing tank. It relates to a washing machine drive device and a washing machine and a washing machine driving method having the same.

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

The washing machine of the patent document 1 has a washing motor having an outer rotor type and having a larger diameter than the dewatering motor, but there is a problem in that a driving torque is insufficient to process a large amount of laundry in a large washing machine of 8 kg or more.

Moreover, the washing machine of the said patent document 1 proposes the structure which drives a stirring body by the outer rotor type washing motor which has a larger diameter than the dehydration motor, is arranged outside, and has a low speed high-torque motor characteristic, There is a problem in that it is difficult to implement a strong washing water flow by driving the rotating tub which is required torque in the opposite direction to the stirring body.

Therefore, the washing machine of Patent Document 1 discloses a structure capable of independently driving the stirring body and the rotating tank by using two driving motors, but it is proposed to make various types of washing water streams using high torque in a large-capacity washing machine. It is not.

In the washing machine of Patent Document 1, the dehydration motor is set to the energization mode of the rotational direction opposite to the washing motor during the washing process, or only by driving the stirring body by the washing motor in a state in which the rotating tank is prevented from idling by the electric brake. Since the washing water flow is formed, it is impossible to generate a stronger water flow (laundry force) capable of washing a large load of laundry in a large-capacity washing machine.

Furthermore, the washing machine of the patent document 1 is an inner rotor having a small diameter and a small driving torque when the pulsator (stirrer) and the washing tank (rotary bath) are rotated in opposite directions to form a strong flow of water to increase the degree of cleaning. Initially starting a washing tank filled with a large amount of laundry and water has a problem in that the initial starting current is excessively consumed due to a lack of driving torque of the inner rotor, resulting in a decrease in efficiency.

In consideration of the problems of the conventional automatic washing machine, Korean Patent Laid-Open Publication No. 10-2015-0008347 (Patent Document 2) combines a double rotor-double stator type twin-power drive motor and a planetary gear device, and a dehydration tank and a pulsator A technique for forming a variety of laundry streams by simultaneously driving independently is proposed.

The Patent Document 2 proposes a washing method for forming washing water flows in opposite directions by a twin force by rotating the pulsator and the washing tank in the same direction or in the opposite direction during the washing stroke, but reducing the current consumption and the washing machine. There is no suggestion for the formation of water streams with increased efficiency.

Particularly, in Patent Document 2, simultaneously driving the washing tanks in different directions and at the same speed as the pulsator when forming washing water flows in opposite directions due to the bi-directional force in the washing stroke, the large current is consumed when driving the washing tank. May cause a problem.

On the other hand, the operation method of the conventional fully automatic washing machine using the single-force power generates a vertical rising / falling water flow by changing the direction while repeating the pulsator forward, stop, reverse rotation, stop, so that water and detergent contact the laundry well. This is done.

In this case, A.C. as the drive motor. Induction motor is used, and the driving time and the stopping time are repeatedly driven and operated at short time intervals within the range of 0.5 seconds to 2 seconds at the preset RPM according to the application of the drive signal, or the stopping time for the short time during the running time. The intermittent driving method to give a seal is used. In this case, the driving rate is 50%.

Induction motor is characterized by low noise and low vibration, but it has low torque characteristics at low speed and has a slow dynamic response. Therefore, it is difficult to form strong washing water flow while changing the direction of rotation in the forward and reverse direction quickly during the washing stroke. have.

On the contrary, the BLDC motor has a fast dynamic response, low rotor inertia, and is easy to control the speed of the synchronous motor. However, a driving method for utilizing the characteristics of the BLDC motor as a driving device for a washing machine has not been proposed.

Accordingly, the present invention has been made to solve the above problems, the object of which is to use the double rotor-double stator type twin-power drive motor, to form a strong three-dimensional three-dimensional washing water flow with high cleaning The present invention provides a washing machine driving device and a washing machine using the same, which can minimize energy consumption when forming washing water flows in opposite directions by reverse driving of the pulsator and the washing tank.

It is another object of the present invention to provide a washing machine driving method capable of forming a strong vortex with high cleaning power by improving the starting method and stopping method of the twin power drive motor when the pulsator and the washing tank are driven in reverse direction using the twin power. There is.

Still another object of the present invention is to set the operating time longer than the stop time so as to make good use of the characteristics of the BLDC motor to increase the operation rate while reducing the overall washing time to reduce the overall power consumption washing machine and washing machine driving method To provide.

Another object of the present invention is to increase the drive torque of the inner rotor by increasing the drive torque of the inner rotor by adopting a rare earth magnet having a high magnetic flux density of the magnet of the inner rotor having a small diameter and a small driving torque when forming the washing water flow in the opposite direction The present invention provides a washing machine driving device and a washing machine using the same, which do not follow even when the initial start of the washing tank filled with water.

It is still another object of the present invention to drive a washing tank with a large diameter outer rotor with a large driving torque, and a small diameter inner rotor with a small driving torque increases driving torque similarly to an outer rotor by using a high-magnet magnet of rare earth type. It is to provide a washing machine driving device for driving a pulsator by using the same and a washing machine using the same.

Another object of the present invention is to equalize the driving torque of a small diameter inner rotor using a high-magnet magnetic magnet of a rare earth system and a large diameter outer rotor having a large driving torque to increase driving torque in washing and rinsing stroke. An object of the present invention is to provide a washing machine driving device capable of simultaneously driving an pulsator and a washing tank to form various washing streams and rinsing patterns, and a washing machine using the same.

According to a first aspect of the present invention, the present invention has a double rotor-double stator type drive motor having an inner rotor and an outer rotor that can be independently controlled by a double stator, and selectively generating an inner rotor output and an outer rotor output. ; An inner shaft which transmits the outer rotor output or the inner rotor output to a pulsator; An outer shaft rotatably coupled to an outer circumference of the inner shaft and transmitting the inner rotor output or the outer rotor output 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 pulsator is clockwise and counterclockwise during the washing stroke. It has a stop time when switching the rotation direction, the washing tank is started before the driving time of the clockwise and counterclockwise direction of the pulsator is characterized in that the drive is controlled in the opposite direction to the rotation direction of the pulsator do.

The driving of the washing tank may be extended by the stop time of the pulsator.

In addition, the washing tank may be driven in a direction opposite to the rotation direction of the pulsator at the same time as the clockwise and counterclockwise starting of the pulsator, and may be shorter than the driving time of the pulsator.

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

An overshooting drive may be performed at the start and stop operations of the pulsator, and a ramp-up drive may be performed at the start of the pulsator. In addition, the pulsator may be driven at a variable speed.

As the RPM of the pulsator becomes higher at the time when the electromagnetic brake is performed to change the rotation direction of the pulsator, the stop time may increase. In this case, the pulsator may be stopped by electromagnetic brake using a driver for driving the outer rotor.

In addition, 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.

The outer rotor includes a plurality of second magnets having a predetermined gap on the outer surface of the stator, and the N pole and the S pole are alternately disposed; A second back yoke disposed on a rear surface of the second magnet; And it may include an outer rotor support for supporting the second magnet and the second back yoke.

In this case, the outer rotor support has an outer flat portion having a cross section facing the inner and outer stator coils of the stator in the cup-shaped bottom surface, an inner flat portion which is engaged with the inner shaft, and the outer flat portion and the inner flat surface. And an inclined connecting portion for connecting the portions, and the outer flat portion may include first and second through holes for discharging heat generated from the inner and outer stator coils to the outside at portions facing the inner and outer stator coils, respectively. Can be.

In addition, the outer rotor support may include a plurality of radial reinforcing ribs protruding radially at predetermined angles on the outer and inner circumferential surfaces thereof, respectively; And first to third circumferential reinforcing ribs formed at intervals in the circumferential direction on the inner circumferential surface thereof.

The control unit rotates the pulsator in a first direction for a first period, drives the washing tub to rotate in a direction opposite to the first direction for a second period before the first period ends, and the first period. Stop the pulsator according to the elapse of, and stop the washing tank according to the elapse of the second period after the elapse of the first period.

According to a second aspect of the invention, the present invention provides an outer tub for receiving wash water; A washing tank rotatably disposed in the outer tub to perform washing and dehydration; A pulsator rotatably disposed in the washing tank to form a washing stream; And the washing machine driving device for simultaneously or selectively driving the washing tank and the pulsator.

According to a third aspect of the present invention, there is provided a device comprising: a first step of rotationally driving a pulsator in a first direction during a first period; A second step of rotating the washing tub in a direction opposite to the first direction for a second period before the first period ends; Stopping the pulsator in accordance with the passage of the first period; A fourth step of stopping the washing tub according to the passage of the second period after the passage of the first period; And a fifth step of sequentially setting rotation directions of the pulsator and the washing tank in the first to fourth steps, respectively, when the stoppage time of the pulsator elapses after the elapse of the second period. It provides a washing machine driving method characterized in that.

As described above, in the present invention, by using a double rotor-double stator-type twin-drive drive motor, a strong 3 with high cleaning while minimizing energy consumption when forming a washing water stream by reverse driving of the pulsator and the washing tank. Dimensional solid washing water can be formed.

In addition, in the present invention, a strong vortex with high cleaning power can be formed by improving the starting method and the stopping method of the twin-power drive motor when the pulsator and the washing tank are driven in the reverse direction using the twin-force.

Furthermore, in the present invention, it is possible to minimize the overall power consumption by shortening the overall washing time while increasing the operation rate by setting the operation time long enough to stop utilizing the features of the BLDC motor.

In addition, in the present invention, the operation rate is increased by setting an appropriate ratio of the operating time and the stopping time of the inner rotor and the outer rotor during the two-way water washing washing stroke in which the pulsator and the washing tank are rotated in the opposite directions by using the twin power. By improving the efficiency of the washing machine can be increased.

In the present invention, a large diameter outer rotor is used to drive a washing tank requiring high torque, and a small diameter inner rotor with a small drive torque is similar to an outer rotor by using a rare earth type high magnetic magnet. The pulsator can be driven by increasing.

In addition, the present invention implements equally the drive torque of a small diameter inner rotor using a high-magnet magnetic magnet of a rare earth system and a large diameter outer rotor having a large driving torque in order to increase the driving torque, so that the washing stroke and the rinse stroke The pulsator and the wash tub can be driven simultaneously to form various water streams and rinsing patterns, such as countercurrent wash streams.

In the present invention, when forming the washing water flow in the opposite direction, by employing a rare earth magnet having a high magnetic flux density of the magnet of the inner rotor having a small diameter and a small driving torque, the laundry torque of the inner rotor is increased to increase the amount of laundry and water. There is no strain on the initial start-up of a filled washing tank.

In addition, in the present invention, the outer rotor having a large driving torque is connected to a washing tank requiring high torque, and the inner rotor having a small driving torque is connected to a pulsator capable of driving at low torque while employing a rare earth magnet. The drive torque can be increased to form various water streams and rinsing patterns, such as mutually opposite washing water streams.

In addition, according to the present invention, as the structure is simplified by removing the planetary gear device for torque shift, it is possible to increase assembly productivity and reduce manufacturing cost, and to eliminate noise generated during torque shift.

The present invention can be applied to large-capacity washing machines by equally implementing the drive torques of the inner rotor and the outer rotor.

1 is an axial cross-sectional view of a washing machine having a washing machine driving device according to a first embodiment of the present invention.

FIG. 2 is an axial partial cutaway sectional view of the washing machine drive shown in FIG. 1. FIG.

3A to 3D are a rear view, an inner side view, a right side view, and a cross-sectional view along the line A-A of FIG. 3A, respectively, of the outer rotor shown in FIG.

Figure 4a is a sectional view in the radial direction of the drive motor according to the present invention.

4B is a schematic cross-sectional view of the stator core assembly used for stator assembly.

4C is a plan view of the split core constituting the stator core.

5 is a graph showing a comparison between torque and efficiency when a ferrite magnet and an Nd magnet are used in the inner rotor.

6 is a block circuit diagram of a washing machine control apparatus according to the present invention.

7 is a flow chart showing the overall washing machine driving method according to the present invention.

8A and 8B are flowcharts illustrating a method of forming mutually opposite washing water streams according to the present invention.

9 to 12 are RPM timing diagrams of a pulsator and a washing tank for implementing mutually opposite washing water flow forming methods according to the present invention, respectively.

13 is an axial sectional view of the washing machine driving apparatus according to the second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description.

1 to 4C, the washing machine according to the first embodiment of the present invention includes a case 100 forming an external appearance, an outer tub 110 disposed inside the case 100 to accommodate washing water, and A washing tank 120 rotatably disposed in the outer tub 110 to perform washing and dehydration, a pulsator 130 rotatably disposed at the bottom of the washing tub 120 to form a stream of laundry; Washing machine driving device installed at the lower portion of the washing tank 120 and the outer tank 110 to provide the driving force necessary for washing, rinsing, loosening and dewatering stroke to the washing tank 120 and the pulsator 130 simultaneously or selectively. And 150.

The washing machine driving device 150 is mounted to the lower portion of the outer tub 110 and the drive motor 140 of the double rotor-double stator method for generating a twin force from the inner rotor 40 and the outer rotor 50, and the drive The outer shaft 20 and the inner shaft 30 which receive the bi-directional force provided by the inner rotor 40 and the outer rotor 50 of the motor 150 and transmit them to the pulsator 130 and the washing tank 120. Include.

As shown in FIG. 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, and an inner rotor 40. It includes a stator 60 disposed with a gap between the outer rotor 50 to drive the inner rotor 40 and the outer rotor 50 to rotate. The stator 60 has a double stator structure for independently driving the inner rotor 40 and the outer rotor 50, respectively.

Accordingly, the stator 60 may perform the outer stator as shown in FIG. 4A to selectively / independently drive the inner rotor 40 and the outer rotor 50 using the first and

second drivers

530 and 540 shown in FIG. 6. 60b and the inner stator 60a are provided. In the following description of the embodiments described below, the outer stator and the inner stator are illustrated as being integrally formed. However, the outer stator and the inner stator may have a separate structure.

The outer shaft 20 is rotatably coupled to the outer circumference of the inner shaft 30, one end of which is connected to the center of the inner rotor 40, and one end of which is the other end of the first shaft 22. The second shaft 24 is coupled to the other end is coupled to the washing tank 120. In this case, the first shaft 22 and the second shaft 24 may be integrally formed.

A cylindrical first sleeve bearing 80 is installed between the outer circumferential surface of the inner shaft 30 and the inner circumferential surface of the first shaft 22, and the second sleeve bearing 82 is provided on the upper inner surface of the second shaft 24. It is installed to rotatably support the inner shaft (30).

The outer surface of the first shaft 22 is formed with a first connecting portion 90 through which the inner rotor support 46 of the inner rotor 40 is connected through the bushing 48, and the outer rotor at the lower end of the inner shaft 30. A second connecting portion 92 is formed to which the outer rotor support 56 of 50 is connected via the bushing 58.

The first connecting portion 90 and the second connecting portion 92 may have a structure that is serration-coupled or spline-coupled by protrusions formed on the outer surfaces of the outer shaft 20 and the inner shaft 30, and has a key groove. It can have a structure that is formed and keyed together.

Here, the first fixing nut 34 is screwed to the lower end of the outer shaft 20 to prevent the inner rotor support 46 from being separated from the outer shaft 20, and the outer end of the outer shaft 30 is screwed. The second fixing nut 36 is screwed to prevent the outer rotor support 56 of the rotor 50 from being separated.

A third connecting portion 94 is formed on the upper outer surface of the second shaft 22 to connect the washing tub 120, and a fourth connecting portion 96 is connected to the pulsator 130 on the upper outer surface of the inner shaft 30. Is formed.

The third connecting portion 94 and the fourth connecting portion 96 may have a structure that is serration-coupled or spline-coupled by protrusions formed on the outer surfaces of the second shaft 22 and the inner shaft 30, and the key groove. It may have a structure that forms a key combination with each other.

A first seal 220 is installed between the second shaft 22 and the inner shaft 30 to prevent the wash water from leaking, and the wash water is leaked between the second shaft 22 and the second bearing housing 10. The second seal 221 is mounted to prevent the second seal 221.

The first bearing 26 is disposed on the outer surface of the first shaft 22, and the second bearing 28 is disposed on the outer surface of the second shaft 24, so that the first and

second shafts

22 and 24 are disposed. Support 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 extends inwardly from the stator support 270, and a first bearing seating portion 104 in which the first bearing is seated is formed on an inner surface thereof.

The second bearing housing 10 is formed of a metal material, and extends outwardly from the second bearing seat 12 and the second bearing seat 12 on which the second bearing 28 is seated. The second seal fixing portion 14 to which the 221 is fixed, the connecting portion 16 bent downward from the second seal fixing portion 14 to form a cylindrical shape, and from the lower end of the connecting portion 16 to the outside direction. It extends to include a flat plate 18 fixed to the outer tub (110). The flat plate portion 18 is fixed to the stator support 270 and the outer tub 110 by bolts 260.

Here, an opening is formed in the center of the outer tub 110, the second bearing housing 10 has a central portion protruded through the opening of the outer tub 110, and the flat plate 18 of the outer tub 110 is disposed. In contact with the rear surface, the stator support 270 is laminated on the second bearing housing 10 and then fastened to the outer tub 110 by one bolt 260.

In the present invention, as described below, the washing tank 120 and the pulsator 130 are rotated at the same time or selectively and in the same direction or the opposite direction by a drive motor 140 having a twin-torque double stator structure. It is possible to form laundry streams in a variety of ways.

Hereinafter, a driving motor 140 having a twin-force structure composed of a double rotor-double stator will be described in detail with reference to FIGS. 2 to 4C.

The drive motor 140 includes an outer rotor 50, an inner rotor 40, and a stator 60, and the stator 60 selectively / independently includes the outer rotor 50 and the inner rotor 40. An outer stator 60b and an inner stator 60a are provided to drive. The stator may be configured as an integral structure or a separate structure of the outer stator and the inner stator as shown in Figure 4a.

First, as shown in FIG. 2, the inner rotor 40 is disposed with a predetermined gap on the inner surface of the stator 60, and a plurality of first magnets 42 having an N pole and an S pole alternately arranged. The first back yoke 44 disposed on the rear surface of the first magnet 42 and the inner rotor support 46 formed integrally with the first magnet 42 and the first back yoke 44 by insert molding. It includes.

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, so that the first magnet 42 and the first back yoke 44 at one end thereof. It is formed integrally with

The inner rotor support 46 has an inner end connected to the first connecting portion 90 of the first shaft 22 through the first bushing 48, and the outer end is bent at a right angle so that the outer surface thereof has a first magnet 42. ) And the first back yoke 44 are fixed to form a cup.

Therefore, 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 tank 120.

The inner rotor 40 has a smaller diameter and has a smaller driving torque than the outer rotor 50. Therefore, as will be described later, when the pulsator and the washing tank are strongly rotated in opposite directions to form a three-dimensional three-dimensional washing water flow having high cleaning degree, the inner rotor 40 driving the washing tank 120 has a high magnetic flux density. Rare earth magnets such as neodymium (Nd) magnets are adopted to increase driving torque.

When the washing tank 120 is filled with a large amount of laundry and water, the initial starting current may be excessively consumed due to excessive force during initial startup. However, this problem does not occur by increasing the driving torque of the inner rotor. .

In addition, the outer rotor 50 is disposed on the outer surface of the stator 60 with a plurality of second magnets 52 and N and S poles alternately arranged on the rear surface of the second magnet 52. The second back yoke 54 is disposed, and the outer rotor support 56 formed integrally with the second magnet 52 and the second back yoke 54 by insert molding.

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

The outer rotor support 56 has an inner end connected to the second connecting portion 92 of the inner shaft 30 to rotate like the inner shaft 30, and the outer end is bent at a right angle so that the second magnet 52 is disposed on the inner surface thereof. ) And the second back yoke 54 are fixed to form a cup shape to accommodate the stator 60 and the inner rotor 40.

Here, the pulsator 130 may be rotated sufficiently by the outer rotor 50 having a large driving torque, because the required rotation torque is not large compared with the washing tank 120 and the diameter is large. Therefore, the second magnet 52 of the outer rotor 50 may use hard ferrite, which is inexpensive and hard magnetic material.

In addition, the outer rotor 50 considers the thickness of the first fixing nut 34 screwed to fix the inner rotor support 46 to the first shaft 22, as shown in Figs. 3a to 3d. The outer rotor support 56 is spaced apart from the inner rotor support 46 at a greater distance than the first fixing nut 34.

Accordingly, the outer rotor support 56 has an outer flat portion 56a facing the inner and outer stator coils 66 and 68 in the cup-shaped bottom surface, and an inner flat portion which is engaged with 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

radial reinforcing ribs

51, 51a are projected radially at regular angles on the outer circumferential surface and the inner circumferential surface, respectively, to maintain the strength while the inner circumferential surface further includes first to third circumferential reinforcing ribs 53a-53c. Are formed at intervals in the circumferential direction.

The inner stator coil 66 constituting the stator 60 in the outer rotor support 56 and the outer flat portion 56a facing the outer stator coil 68 respectively have first and second through holes 55 communicating with the outside. 57 is formed. The first and second through

holes

55 and 57 serve as air circulation passages for discharging heat generated from the inner and outer stator coils 66 and 68 to the outside.

The stator of this invention is demonstrated below.

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 circumferential portion thereof is fixed to the outer tub 110. , A stator support 270 (see FIG. 2) having a through hole formed therein. The plurality of stator core assemblies 61 are formed of an insulating material on the outer side of the divided stator core 62 and the divided stator core 62 which are arranged in an annular shape and coupled to each other as shown in FIGS. 4A and 4B, respectively. A bobbin 64 defining a coil winding area on the inner side and the outer side, an inner stator coil 66 wound around one side (inside) bobbin of the stator core 62, and the other side (outside) bobbin of the stator core 62. It includes an outer stator coil 68 wound on.

The stator support 270 is formed integrally with the plurality of stator core assemblies 61 by insert molding after arranging the plurality of stator core assemblies 61 in the circumferential direction in a mold. The stator core assembly 61 is disposed in the middle of the stator support 270, and the inside of the stator support 270 is bent in two stages to extend to form the first bearing housing 102, and the first bearing seating portion at the inner end thereof. 104 is disposed.

As the first bearing 26 is installed on the first bearing seating part 104, the first bearing 26 may rotatably support the outer shaft 20, and improve the assemblability of the driving motor 140. 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 270 is bent in one stage and extended, and the tip portion is fixed to the outer tub 110 by the bolt 260 together with the second bearing housing 10.

In addition to the structure in which the stator support 270 is integrally formed with the stator core assembly 61 by insert molding, the stator support 270 and the bolt are manufactured separately from the stator core assembly 61 by using a resin or metal material. The fastening structure can also be applied.

The stator 60 according to the present invention is configured by assembling a plurality of stator core assemblies 61 configured using a plurality of split stator cores as shown in FIG. 4B in an annular shape, as shown in FIG. 4A. Can be.

In the exemplary embodiment illustrated in FIG. 4A, the stator cores to which the inner and outer stator coils 66 and 68 are wound are configured as a plurality of split stator cores 62 that are arranged in an annular shape and interconnected. The present invention is not limited to this, and it is also possible that the stator core is composed of an integral or partially split core.

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

In the illustrated embodiment, it is possible to configure by using a split stator core, one for each tooth, or to assemble several teeth, for example, three teeth as one split stator core. Particularly, in the case of U, V, W three-phase driving type BLDC motor, three teeth are divided into one split stator core when the coil is wound continuously in three teeth for one phase of U, V, and W. It is also preferable to produce with.

The split stator core 62 is disposed on the outer side as shown in FIGS. 4A to 4C and on the opposite side and the inner side of the first tooth portion 312 and the first tooth portion 312 on which the outer stator coil 66 is wound. A second tooth portion 310 formed to wind the inner stator coil 68, a partition portion 314 that partitions between 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 ends of the lateral sides thereof to interconnect the split stator cores 62.

In the stator 60 of the present invention, the outer stator coil 68 wound around the first teeth 312 of the stator core 62 to drive the outer rotor 50 and the inner rotor 40 is the outer stator 60b. ), And the inner stator coil 66 wound around the second tooth portion 310 of the stator core 62 forms the inner stator 60a to form a double stator.

In addition, in the embodiment illustrated in FIGS. 4A to 4C, the core is separated for each slot to be configured as a plurality of split stator cores 62. However, the stator for the outer stator is separated based on the annular back yoke. It is also possible to separate the core and the stator core for the inner stator, and then to assemble them.

In the present invention, as shown in FIG. 6, the driving signal is transmitted from the first and

second drivers

530 and 540 to the inner stator coil 66 constituting the inner stator 60a and the outer stator coil 68 constituting the outer stator 60b. By applying separately, the outer rotor 50 and the inner rotor 40 are respectively driven.

Here, 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, the inner rotor 50 is provided only when the driving signal is applied to the inner stator coil 66. ) Is rotated, only when the drive signal is applied to the outer stator coil 68, only the outer rotor 40 is rotated, when the drive signal is applied to the inner and outer stator coils (66, 68) at the same time the inner rotor 40 and the outer The rotor 50 is rotated at the same time.

A through hole 332 is formed in the center of the partition 314 and may be used for bolting for integration with the stator support 270.

A first flange portion 318 disposed to face the first magnet 52 is formed at an end portion of the first tooth portion 312, and a second magnet 42 is formed at the end portion of the second tooth portion 310. A second flange portion 316 is disposed to face each other.

The first flange 318 and the second flange portion 316 are inwardly and at a predetermined curvature so as to correspond to the first magnet 52 of the outer rotor 50 and the second magnet 42 of the inner rotor 40, respectively. It forms an outwardly curved surface. Therefore, since the roundness of the inner circumferential surface and the outer circumferential surface of the stator core 62 is increased, the gap between the inner circumferential surface and the outer circumferential surface of the stator 60 and the first magnet 52 and the second magnet 42 is close to a constant magnetic gap. Can be maintained.

Between the stator cores 62 should have a structure directly connected to each other to form a magnetic circuit. Accordingly, the

coupling parts

320 and 322 have a structure in which adjacent stator cores 62 are directly connected to each other.

For example, the

coupling parts

320 and 322 are formed such that the coupling protrusion 322 protrudes on one side of the partition 314, and the coupling groove 320 into which the coupling protrusion 322 is fitted to the other side of the partition 314. ) Is formed, and when the coupling protrusion 322 is inserted into the coupling groove 320 to assemble, a plurality of split stator cores 62 are arranged in an annular shape and have a structure directly connected to each other.

The driving motor 140 of the present invention forms a first magnetic circuit (L1) between one side (that is, the inner stator) of the stator 60 to which the inner rotor 40 and the inner stator coil 66 are wound, Since the second magnetic circuit L2 is formed between the outer rotor 50 and the other side of the stator 60 on which the outer stator coil 68 is wound (that is, the outer stator), each of the outer rotor 50 forms an independent magnetic circuit. 40 and the outer rotor 50 may be driven separately, respectively.

Specifically, the first magnetic circuit L1 includes a first tooth portion 310 on which the first magnet 42 of the N pole, the inner stator coil 66 is wound, an inner portion of the partition 314, and an N pole of the first magnetic circuit L1. Via 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 is divided into a second tooth portion 312 facing the second magnet 52 of the N pole and the second magnet 52 of the N pole and having the outer stator coil 68 wound thereon. Via the outer portion of the portion 314, the second magnet 52 and the second back yoke 54 of the S pole.

However, the first and second magnetic circuits L1 and L2 may have the U, V, and W phases of the inner and outer stator coils 66 and 68 wound around the first and

second tooth portions

310 and 312 for each tooth. One-winding coil method for winding with different phases, U, V, W phase winding every two teeth, U, V, W phase for every three teeth Alternatively, the winding may be changed depending on the three-winding coil method and driving method.

The drive motor 140 according to the above 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 drive is required to drive the washing tub 120 having a larger 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.

Also, in general, a larger diameter outer rotor 50 has a higher torque output than a smaller diameter inner rotor 40.

Accordingly, the washing machine driving device 150 using the driving motor 140 according to the present invention shown in FIG. 2 includes an inner shaft 30 that outputs a high torque output generated from a large diameter outer rotor 50. It transmits to the pulsator 130 to drive the pulsator 130, the inner rotor (40) of the small diameter (Inner Rotor) 40, the drive torque of the inner rotor by adopting a rare earth magnet having a high magnetic flux density By increasing and driving the washing tub 120 through the outer shaft 20, it is possible to drive a washing tub which requires a large driving torque at first.

In the following experiment, a ferrite magnet is used for the outer rotor 50 and the inner rotor 40 of the small diameter, as shown in Table 1, for the driving motor 140 shown in FIG. 2. In the case of using the same type of ferrite magnet as the outer rotor and using the Nd magnet, the motor characteristic values were obtained when the rotor rotation speed was 200 rpm.

In addition, for the inner rotor and the outer rotor using the ferrite magnet, the inner rotor using the Nd magnet when the rotation speed of the rotor is 120rpm to calculate the value for the torque and efficiency is shown in the graph in FIG.

스테이터 슬롯수Number of stator slots	--	2727
로터 폴수Rotor count	--	2424
코어 적층Core lamination	mmmm	2727
		인너 로터(페라이트 자석)Inner rotor (ferrite magnet)	인너 로터(Nd 자석)Inner rotor (Nd magnet)	아우터 로터(페라이트 자석)Outer rotor (ferrite magnet)
코일 직경/턴수Coil diameter / turns	--	0.65/1300.65 / 130		0.65/1800.65 / 180
권선 저항Winding resistance	R_LL(mH) [Ω]R_LL (mH) [Ω]	15.715.7		23.923.9
권선 인덕턴스Winding inductance	L_LL[mH]L_LL [mH]	9393		217217
모터 상수Motor constants	KmKm	0.650.65	1.181.18	1.391.39
토크 상수Torque constant	KtKt	3.153.15	5.735.73	8.318.31
Back EMF@200rpmBack EMF @ 200rpm	E_ph[V]E_ph [V]	2222	4040	5858

As shown in Table 1, the number of slots of the inner stator 60a and the outer stator 60b is 27, and the number of poles of the inner rotor 40 and the outer rotor 50 are the same. 24, core stacking 27mm, the inner side and the outer side is set to be the same, the coil wound on the stator core is wound around the inner stator (60a) wire of 0.65mm diameter 130 times and the outer stator (60b) 180 times It was.

As a result, a large difference occurs in the winding resistance and the winding inductance of the inner stator 60a and the outer stator 60b. In the inner rotor 40 motor and the outer rotor 50 motor using the same ferrite magnet, the back EMF (200 rpm) is used. ) Was 22V and 58V, respectively. However, in the inner rotor 40 using the Nd magnet, Back EMF (200 rpm) was generated at 40V, which is 1.8 times higher than that of 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 EMF and the current, the inner rotor 40 using the Nd magnet has a larger torque than the inner rotor using the ferrite magnet.

The torque constant Kt and the motor constant Km are both proportional to the back EMF (back EMF), and it can be seen that the inner rotor 40 using the Nd magnet exhibits superior motor characteristics than the inner rotor using the ferrite magnet.

In addition, referring to the graph of FIG. 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 using the ferrite magnet is shown. 40 shows that the efficiency is significantly low.

Therefore, in the present invention, since the Nd magnet is used for the inner rotor 40, the outer rotor 50 using the ferrite magnet has the same torque and efficiency, and therefore, the washing tank (not only the pulsator 130) during the washing and rinsing stroke. 120 can also form a variety of washing and rinsing water streams utilized simultaneously.

4A to 4C, the stator 60 prepares the plurality of stator core assemblies 61 by using the plurality of split stator cores 62, and then the plurality of stator core assemblies 61. Although the number of slots of the outer stator and the inner stator by the combination with the stator supporter 270 is illustrated to be manufactured in the same configuration, 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.

6 is a block circuit diagram of a washing machine control apparatus according to the present invention, Figure 7 is a flow chart briefly showing the overall washing machine control method according to the present invention.

Referring to FIG. 6, a washing machine control apparatus 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, and an outer stator core. The second driver 540 for generating a second drive signal applied to the outer stator coil 68 wound on the 312, and the first driver 530, the second driver 540 and the entire washing machine to control And a control unit 500.

The control unit 500 acts as a system controller to control the entire washing machine simultaneously with the control of the first and

second drivers

530 and 540 as described above, or according to the washing course set by the user from the system controller of the washing machine body. After receiving the determined washing control signal may be configured as a driver-specific control device for applying a separate control signal to the first and second drivers (530, 540) based on this. The control unit 500 may be configured as a signal processing device such as a microcomputer or a microprocessor. The control unit 500 may include a PWM controller or a separate PWM controller to generate a pulse width modulation (PWM) control signal.

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

The stator 60 of the present invention includes an inner stator 60a including an inner stator coil 66 and an outer stator coil 68 to drive the inner rotor 40 and the outer rotor 50, respectively. A double stator including 60b is formed.

As a result, the inner stator 60a and the inner rotor 40 which are rotated by the inner stator 60a form an inner motor, and the outer stator 60b and the outer stator 60b 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 in a BLDC manner, respectively, and in the first and

second drivers

530 and 540, for example, in a six-step manner. Drive control is made.

The first and

second drivers

530 and 540 may each include an inverter including three pairs of switching transistors connected in a totem pole structure, and the U, V, and W three-phase outputs of each inverter may include an inner and an outer stator coil ( 66, 68) is applied to the U, V, W three-phase coil.

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 sensors

510 and 520, respectively, which are made of, for example, a Hall sensor. PWM control signals are applied to the first and

second drivers

530 and 540, and the first and

second drivers

530 and 540 receive the control signals and output the U, V, and W three-phase outputs to the inner and outer coils 66, respectively. The inner rotor 40 and the outer rotor 50 are rotationally driven by being applied to the U, V, and W three-phase coils of 68).

The control unit 500 has a program for executing various washing courses in the memory device, and all washing courses basically include washing strokes, rinsing strokes, and dehydrating strokes. Is included before and after, depending on the washing course is performed repeatedly at least one of the washing stroke, rinsing stroke, dehydration stroke.

Thus, the operation of the washing machine according to the present invention configured as follows will be described with reference to FIG.

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

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

As a result of the determination, when performing the washing or rinsing stroke, the control unit 500 detects the weight (load amount) of the laundry (not shown), sets the water level step according to the detected laundry weight (load amount), and supplies water. To start.

In addition, according to the weight of the laundry (load amount) and the type of laundry, the washing administration step is set according to the washing course set by the user. When the set water supply is completed and the washing administration stage is set, the set washing administration starts.

That is, the inverters of the first driver 530 and the second driver 540 are driven in accordance with the set washing or rinsing stroke (S204).

Then, the first driver 530 and the second driver 540 selectively and independently generate three-phase AC power, the generated three-phase AC power is the inner stator coil 66 and the outer stator of the stator 60 As applied to the coil 68, the washing is driven by any one of a variety of washing courses. The washing or rinsing stroke is repeatedly performed a plurality of times according to various washing courses, and the washing stroke may be performed by combining various washing water streams.

The washing method using the drive motor 140 of the double rotor-double stator method will be described in detail below.

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

When the dehydration stroke is to be performed as a result of the determination, the control unit 500 drives only the inner rotor 40 or rotates the inner rotor 40 and the outer rotor 50 in the same direction / same RPM. The same driver signal is applied to the inner stator coil 66 and the outer stator coil 68 by controlling the first driver 530 and the second driver 540. Accordingly, the rotational force generated by the inner rotor 40 and the outer rotor 50 is transmitted to the washing tub 120 and the pulsator 130 through the outer shaft 20 and the inner shaft 30 to rotate at the same speed in one direction. To perform a dehydration stroke (S212).

Then, the control unit 500 determines whether the execution time of the dehydration stroke has elapsed (S214), and when the time of the dehydration stroke has elapsed, the washing operation of the laundry is terminated.

More specifically, the washing or rinsing stroke according to the present invention described above is as follows.

When the washing or rinsing stroke is performed, the control unit 500 drives the inverters of the first driver 530 and the second driver 540 according to the washing or rinsing stroke.

Then, the first driver 530 and the second driver 540 generates three-phase AC power, the generated three-phase AC power is the inner stator coil 66 and the outer stator coil 68 of the stator 60 Optionally, independently. Accordingly, 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 provide rotational forces having similar high torque characteristics, respectively.

When performing washing or rinsing stroke, when 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 rotated. The output of) is transmitted to the outer shaft 20 connected to the inner rotor 40.

Meanwhile, in the present invention, the inner rotor 40 and the outer rotor 50 of the drive motor 40 may have first and

second bearings

26 and 28 capable of bidirectional rotation, and the first and

second sleeve bearings

80 and 82, it is possible to control the rotation direction and the rotation speed of the pulsator 130 and the washing tank 120 in a variety of ways and to form a variety of washing water flow.

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

In the method of forming mutually opposite washing water streams according to the present invention, the pulsator 130 is rotationally driven in one direction, for example, in a forward direction, that is, in a clockwise direction CW by driving the outer rotor 50, and in advance. After the motor ON time is maintained for the set time, the motor has a predetermined OFF time for changing the direction.

In this case, depending on how fast the rotational speed of the pulsator 130 rises to a target RPM of, for example, 160 RPM, the laundry and the washing water rotated in conjunction with this are also strongly rotated. 9 to 11, if the rapid rise within a short time is a strong water is generated and a large friction force is applied to the laundry, and gradually increasing the rotational speed as shown in Figure 12 can be avoided to apply a large friction force to the laundry ( soft washing, such as wool) may be applied.

In addition, a method of raising the outer rotor 50 to 160 RPM, which is a target RPM, may include an overshooting driving as shown in FIG. 9, a sequential starting method of gradually increasing the RPM according to the time as shown in FIG. 10, and a multi-step ramp of FIG. 12. One of the starting methods, such as ramp-up driving, may be applied.

In the present invention, after the pulsator 130 is rotated for at least 2.5 seconds, the outer rotor 50 is stopped to have a predetermined OFF TIME for changing the direction.

The method of stopping the outer rotor 50 may be selected from a method of stopping driving power to the outer stator and a method of applying an electromagnetic brake to the outer rotor 50 using the second driver 540. have.

In this case, when the electronic brake is applied to the outer rotor 50 using the second driver 540 so that the pulsator 130 may be stopped in the shortest possible time, the rolling of the upper laundry may occur. The laundry and detergent can be mixed and at the same time a strong three-dimensional solid water stream is formed.

On the other hand, the washing tank 120 driven by the inner rotor 40 is driven at a different cycle from the driving of the pulsator 130. The washing tank 120 remains stopped until immediately before the driving time of the pulsator 130, that is, the motor ON time, and starts before the driving of the pulsator 130 ends. After the rotational drive is made in a direction opposite to the rotational direction of the 130, the drive is performed for a short period after the driving of the pulsator 130 ends.

In this case, the reverse driving of the inner rotor 40 for rotating the washing tank 120 in the reverse direction is made to a minimum, for example, the driving is performed at (−) 50 RPM.

As described above, when the outer rotor 50 is driven by the outer stator 60b to drive the pulsator 130 in the forward direction CW, that is, clockwise CW for a predetermined period of time, the laundry inside the washing tank 120. And the washing water is rotated and at the same time as the rise of the waterfall after the wall surface of the washing tank 120 by the centrifugal force falls to the center portion is generated. The movement of the laundry and the wash water is performed by mixing and washing the laundry and the detergent by friction and potential energy when the rotation and the drop are made.

After rotating the pulsator 130 at a constant speed for a certain period of time, for example, when the driving power to the outer stator is cut off or stopped by applying an electronic brake, the laundry and the washing water continue to rotate for a short time due to inertia. You lose.

In this case, when the driving of the pulsator 130 is started before the driving of the inner rotor 40 is performed for a short period of time until after the driving of the pulsator 130 ends, the washing tank 120 is also rotated in the reverse direction. A second stream of water flowing in an opposite direction, that is, counterclockwise (CCW), is generated along the inner wall surface of the washing tank 120. As a result, a large vortex is generated while the forward current CW and the circumferential first water flow due to the driving of the pulsator 130 collide with the second water flow in the reverse direction CCW due to the reverse rotation driving of the washing tank 120. .

In the present invention, a strong vertical rise by the pulsator even if the reverse driving of the inner rotor 40 is performed for about 1 second at a minimum driving period and RPM, for example, (−) 50 RPM to minimize energy consumption. As the descending first water flow in the first direction collides with the second water flow in the second direction by the washing tank, vortices are generated, thereby minimizing energy consumption and thus forming a high water flow.

As such, the large vortices generated by the mutually opposite driving forms a strong three-dimensional three-dimensional washing water stream having high cleaning degree.

Thereafter, after the predetermined stop time (OFF TIME), the pulsator 130 is driven to rotate in the reverse direction, that is, counterclockwise (CCW) for driving in the opposite direction, and the motor ON TIME for a preset time. After the operation is performed, the washing machine 120 has a predetermined stop time (OFF TIME) for the change of direction, and the washing tank 120 is also started before the reverse driving of the pulsator 130 ends and a short period of time after the driving of the pulsator 130 ends. While rotating in the forward direction, that is, clockwise (CCW), a large vortex with high cleaning degree is generated by driving in the opposite direction.

When the clockwise (CW) and counterclockwise (CCW) driving of the pulsator 130 is completed, one cycle is completed, and the driving of two cycles proceeds in the same manner as the above-described one cycle, or in another manner. The formation methods may be combined.

In the present invention, the motor ON time may be set, for example, within a range of 2.5 seconds to 10 seconds, and the stop time may be set within a range of 0.5 seconds to 2.0 seconds.

8A and 8B will be described in detail with respect to the method of forming a mutual direction washing water flow using a twin power according to the present invention.

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

The method of rotating the outer rotor 50 to a predetermined RPM, for example, 160 RPM, is an overshooting drive as shown in FIG. 9, a sequential starting method of gradually increasing the RPM according to a time as shown in FIG. 10, and a multi-step ramp of FIG. 12. One of the starting methods, such as ramp-up driving, may be applied.

Thereafter, the rotation speed of the outer rotor 50 (that is, the pulsator) is maintained at 160 RPM for the first predetermined time T1 (S82). As such, when the pulsator 130 is rotated in one direction, the laundry and the washing water inside the washing tank 120 are rotated and at the same time ascending the wall surface of the washing tank 120 by centrifugal force and descending to the center (free fall). As the waterfall is moved, the laundry rotates and free falls repeatedly, and washing is performed by free fall due to friction and potential energy.

If the first predetermined time T1 has elapsed, the control unit 500 drives the first driver 530 to apply the three-phase AC power to the inner stator coil 66 so that the inner rotor 40 may operate. Rotate the washing tank 120 in the reverse direction by rotating (50) RPM in the reverse direction, that is, counterclockwise (CCW) (S83).

As a result, a large vortex is generated while the forward CW and the circumferential first stream of water along with the driving of the pulsator 130 collide with the second stream of CCW along the driving of the washing tank 120. As such, the large vortices generated by the mutually opposite driving forms a strong three-dimensional three-dimensional washing water stream having high cleaning degree.

In general, the washing tank is filled with a lot of laundry and water, and the weight and volume of the washing tank is higher than that of the pulsator, so high torque driving is required at the initial start-up, and the inner rotor driving the washing tank is disposed inside the outer rotor. Compared with the rotor, the driving torque is obtained small.

In the present invention, instead of using an expensive planetary gear device for increasing the torque of the inner rotor 40 of small diameter, the magnet used in the inner rotor is adopted as a rare earth magnet having a high magnetic flux density, thereby driving the inner rotor. By increasing the torque, the washing tub 120 can be driven without difficulty through the outer shaft 20.

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

If the ON time of the outer rotor has passed as a result of the determination, the process proceeds to step S85 of stopping the outer rotor 50 to stop the pulsator 130.

In the present invention, even when stopping the drive of the outer rotor 50 to stop the pulsator 130, 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, Vortex generation continues while the inner rotor 40 is rotating in reverse direction.

As described above, in the present invention, even when the driving of the outer rotor 50 is stopped to stop the pulsator 130, a reverse rotation is applied to the inner rotor 40 to minimize energy consumption while driving in opposite directions by the driving force of the twin power. The effect can be obtained.

Thereafter, it is determined whether the turn-on time of the inner rotor 40, that is, the ON time of the inner rotor has elapsed (S86). If the ON time of the inner rotor has passed as a result of the determination, the process proceeds to step S87 of stopping the inner rotor 40 to stop the washing tank 120.

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

As a result of the determination, when the predetermined motor stop time has elapsed, a procedure for rotating the pulsator 130 in the reverse direction (CCW) and rotating the washing tank 120 in the forward direction (CW) is described above (S81). In contrast to S88, steps S89 to S97 are performed.

In step S97, when the preset stop time has elapsed, it is determined whether the inflated stroke is scheduled (S98). If the inflated stroke is scheduled, the process proceeds to step S99 to perform the inflated stroke. Proceed.

Foaming may occur when washing water streams are generated by mutually opposite driving using twin-force forces. Therefore, if snagging is detected or snagging is anticipated, a bulging stroke is performed. The inflated stroke releases the tangling of the laundry by rotating the pulsator 130 and the washing tank 120 at the same speed in the same direction.

The washing stroke completes the one cycle washing stroke including the steps (S81 to S97), and the driving of two cycles according to the washing course proceeds in the same manner as the one cycle described above, or another method using a single force or a twin force. The washing water flow forming method may be combined.

Thereafter, it is determined whether the washing time has ended (S100). If the washing time is ended, the washing process is terminated and proceeds to a subsequent processing stroke. If the washing time is not finished, the process proceeds to step S81. Repeat the procedure.

In the following embodiment with reference to the RPM timing diagram of the pulsator and the washing tank of FIGS. 9 to 12 will be described a method of forming a mutually opposite washing water flow using the twin power of the washing machine drive device 150 according to the present invention.

(Example 1)

Referring to the RPM timing diagram of the pulsator and the washing tank for forming the mutually opposite washing water flow of Figure 9, the mutually opposite washing water flow forming method according to the first embodiment of the present invention, basically, the pulsator 130 in one direction, For example, after rotationally driving in the forward direction, that is, clockwise direction CW, and maintaining the motor ON TIME for a predetermined time, it has a predetermined OFF TIME for changing the direction.

In FIG. 9, the graph P 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. RPM is shown.

Thereafter, the pulsator 130 is rotationally driven in the other direction, for example, the reverse direction, that is, the counterclockwise direction (CCW), maintains the motor ON TIME for a preset time, and then It has a predetermined OFF TIME.

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

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

In this case, the washing tank 120 is driven at a different cycle from the driving of the pulsator 130. The washing tank 120 maintains the stopped state until the driving time of the pulsator 130, that is, the motor ON time ends, and then rotates in the opposite direction to the rotation direction of the pulsator 130. .

When the outer rotor 50 is rotated by the second driver 540 in the forward direction, that is, clockwise CW, for example, at a rotational speed of 160 RPM, the inner rotor 40 is driven by the first driver 530. As the electromagnetic brake is made, the outer shaft 20 and the washing tank 120 connected to the suspension state are also stopped.

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

Accordingly, when the pulsator 130 is rotated in one direction with a strong maneuverability, the laundry and the washing water are also strongly connected to the laundry. In Embodiment 1 of the present invention, when the pulsator 130 is rotated for at least 2.9 seconds, and then stops, the laundry and the wash water continue to rotate by inertia. That is, when the electronic brake is applied to the outer rotor 50 by using the second driver 540 to stop the pulsator 130 in the shortest possible time, the rolling of the laundry located on the upper part of the washing tank is lowered. As it occurs, a strong three-dimensional stream of water is formed.

In this case, as needed, the outer rotor 50 is overshooted from 160 RPM to 200 RPM before the pulsator 130 is stopped. can do.

Furthermore, in the present invention, the washing tank 120, which was stopped about 0.7 seconds before the driving time of the pulsator 130, that is, the motor ON time, was ended, the direction opposite to the rotation direction of the pulsator 130. By applying a rotational force from the outer circumference to the laundry and the wash water rotated in one direction by driving at 50 RPM, a strong vortex occurs in the laundry and the wash water. In this case, the reverse driving of the washing tank 120 is continued for at least about 0.5 seconds after the driving of the pulsator 130 is stopped to continue the vortex generation.

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

As in the first embodiment, in the present invention, the rotation of one direction at the center of the laundry and the washing water is strongly driven using the pulsator 130, and the washing tank 120 is driven in the reverse direction before the end of the driving of the pulsator. By forming a strong vortex by inducing the opposite direction of water from the outer periphery of the laundry and the wash water, as a result of the present invention to drive the washing tank 120 to minimize the power consumption while forming a three-dimensional washing water stream having a strong washing power While increasing the washing efficiency.

(Example 2)

Referring to FIG. 10, a method of forming mutually opposite washing water streams according to Example 2 is similar to Example 1 shown in FIG. 9.

In the first embodiment, the outer rotor 50 is overshooted from 160 RPM to 200 RPM before the initial driving and the end of the motor ON time, and then stopped. However, in the second embodiment, the overshoot driving is not performed. . Instead, the washing tank 120 is driven in a direction opposite to the rotational direction of the pulsator 130 to generate the vortex within the range of about 1 second during the initial driving of the motor ON time and before the end of the vortex. The driving method is changed to increase the number of occurrences once more.

That is, in the second embodiment, while rotating the pulsator 130 in the forward direction to 160 RPM in accordance with the drive of the outer rotor 50, while driving the inner rotor 40 in the reverse direction for 1.2 seconds, the washing tank 120 to 50 RPM in the reverse direction The inner rotor 40 is rotated and extended to 0.5 seconds after the end of the motor ON time starting from 0.7 seconds before the end of the motor ON time of the outer rotor 50 as in the first embodiment. Drive for 1.2 seconds in the reverse direction to rotate the washing tank 120 in 50RPM in the reverse direction.

In Example 1, when the driving of the outer rotor 50 is stopped, the electronic brake is decelerated by 120 RPM, 80 RPM, and 40 RPM at 0.1 RPM for every 0.1 seconds. However, in Example 2, the electronic brake is applied. Electronic brakes are applied while decelerating by 60 RPM and 50 RPM every 0.1 sec. To 100 RPM and 50 RPM.

In Example 1, since the electronic brake is applied in the state of deceleration to 40 RPM over 0.3 seconds at 160 RPM, the OFF time is assigned to 1.0 seconds, and in Example 2, the electron is decelerated to 50 RPM over 0.2 seconds at 160 RPM. As the brake is applied, the OFF TIME is assigned to 1.1 seconds. In other words, when the outer rotor 50 is suddenly driven to stop, it is preferable to set the OFF TIME relatively longer.

In addition, the method of forming the opposite washing direction of the water stream according to the second embodiment, after the one-cycle washing stroke of the forward rotation, stop, reverse rotation, and stop of the pulsator 130 is completed, the same washing stroke as the one-cycle washing stroke is applied to the washing course. It can be applied repeatedly according to the above, and it is also possible to combine different types of washing water flow and inflated stroke.

In Example 2, after the washing cycle of one cycle is completed, the washing water flow method of varying the speed is applied to the drive RPM of the pulsator 130 of the motor ON time (ON TIME) during the washing cycle of the second cycle.

In the drive device using the BLDC motor, it is possible to easily implement the RPM variable of the rotor, and to reduce the rotational speed of the outer rotor 50 for driving the pulsator 130 from 160RPM to 110RPM to apply a speed control to increase to 160RPM again. In this way, it is possible to generate washing water streams, such as waves coming at regular intervals.

In the method of forming a mutually opposite washing water stream according to the second embodiment is the same as the first embodiment, the description thereof will be omitted.

(Example 3)

Referring to FIG. 11, the method of forming mutually opposite washing water streams according to Example 3 is generally similar to those of Examples 1 and 2.

The difference between Examples 1 and 2 and 3 is that the rotational speed is 160 RPM instead of overshooting the outer rotor 50 from 160 RPM to 200 RPM during the initial driving of the motor ON TIME and before the end thereof. By increasing the rotational speed and driving torque for driving the pulsator 130.

In addition, by inserting a speed control section (Pd) to lower the RPM of the outer rotor 50 from 160 RPM to 120 RPM in the middle portion of the motor ON TIME to generate a washing water with a strong power such as a surge Can be.

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

In Example 3, the motor ON time is set to 2.7 seconds, the OFF time to 1.8 seconds, and the drive to the washing tank 120 is set to about 1.2 seconds.

In the third embodiment, the motor brake is applied to the stationary state in a state where the speed is reduced to 100 RPM over 0.3 seconds at 160 RPM. That is, the control is made so that the RPM of the pulsator 130 is decelerated with at least two inclination inclinations in consideration of the stop at a high rotational speed of 100 RPM and the stop state is reached.

In addition, the OFF TIME is also assigned to 1.8 seconds longer than Example 1 and 2 by adding 0.5 seconds of free-wheeling and 0.3 seconds of starting preparation to 1.0 seconds of the electromagnetic brake. The free wheeling is to release all control so that the inertia rotation is performed after the electromagnetic brake of the pulsator 130.

As described above, in the third embodiment, while the motor ON TIME time for driving the pulsator 130 is set short, the rapid stop is performed at a high rotational speed of 100 RPM and the washing tank 120 is the embodiment described above. Similarly to 1 and 2, the pulsator 130 is rotated at 50 RPM in the reverse direction, starting from the end of the drive and ending after the drive.

As in the third embodiment, in the present invention, the rotation of the one direction at the center of the laundry and the washing water is driven shortly strongly using the pulsator 130, and then before the end point of the pulsator driving while rapidly braking the pulsator. By driving the washing tank 120 in the reverse direction to induce a reverse water current from the outer periphery of the laundry and wash water can form a strong vortex. As a result, in the present invention, the driving time of the pulsator 130 is minimized, thereby minimizing power consumption and forming a three-dimensional washing stream having strong washing power, thereby increasing washing efficiency.

(Example 4)

Referring to FIG. 12, the method of forming mutually opposite washing water streams according to Example 4 is similar to those of Examples 1 to 3 as a whole.

The difference between the fourth embodiment and the first embodiment is that the initial driving of the outer rotor 50 at the time of motor ON TIME is performed by increasing the rotational speed of the outer rotor 50 to a maximum of 200 RPM instead of overshooting the pulsing force. The rotation speed and driving torque for driving the eater 130 are increased.

In addition, when the pulsator is started at the motor ON time, the RPM of the outer rotor 50 is increased to a preset 200 RPM in a multi-step ramp-up manner, and the rotation direction is changed. In order to stop the pulsator 130 in order to stop the pulsator 130 in a short time by controlling to reach the stop state can form a strong water flow.

In the fourth embodiment, the method of rotating the outer rotor 50 to a predetermined RPM applies one of the well-known starting methods, such as the ramp-up starting and the sequential starting method of gradually increasing the RPM over time. can do.

In the fourth embodiment, the stop time is preferably set to be longer than those of the first to third embodiments in consideration of the stop by the sudden braking of the pulsator 130. Accordingly, the off time is also controlled by the electromagnetic brake. 1.5 seconds plus 0.5 second start up time are allocated to 2.0 seconds longer than the first to third embodiments.

Furthermore, in Example 4, the motor ON TIME is 4.5 seconds considering that the RPM of the pulsator 130 having the motor ON TIME higher than that of Example 3 is stopped at a high rotational speed of 200 RPM. , The OFF TIME is 2.0 seconds, the drive to the washing tank 120 is set to 1.2 seconds.

In the fourth embodiment, similarly to the third embodiment, the one-way rotation in the center of the laundry and the washing water is driven strongly using the pulsator 130, and then before the end of the pulsator's driving while rapidly braking the pulsator. By driving the washing tank 120 in the reverse direction to induce a reverse water current from the outer periphery of the laundry and wash water can form a strong vortex. As a result, in the present invention, by combining the strong braking of the pulsator 130 and the reverse driving of the washing tank 120 to form a three-dimensional washing water stream having a strong washing power to increase the washing efficiency.

Example 1 is 74%, Example 2 is 73%, Example 3 is 60%, Example 4 is 67%.

By changing the ratio of the motor ON time and the OFF time during the water washing operation, and setting the operation rate of the washing machine appropriately, it is possible to reduce power consumption and improve cleaning.

In the present invention, the operating rate is at least 60% or more to increase the efficiency while minimizing the power consumption, and the RPM of the pulsator (outer rotor) and the RPM of the washing tank (inner rotor) are preferably set larger than 3: 1.

On the other hand, when the pulsator 130 is driven at a variable speed in the motor driving torque adjustment and rotation maintenance section during the formation of the washing water flow, it is possible to form a rhythm water flow and save energy consumption. In addition, by varying the rotation RPM of the pulsator 130 to mix the strong, medium, and weak water flow, such as strong-> medium-> weak-> medium-> weak, etc., high cleaning and rinsing degree can be achieved with less energy. You can expect

In the above description of the embodiment, the stopping method of the motor driving the pulsator and the washing tank is exemplified by using an electromagnetic brake. However, as in the third embodiment, a free-wheeling method requiring a long stopping time is combined with the electromagnetic brake. It is also possible to stop just by freewheeling. In addition, other well-known methods other than the electromagnetic brake can be used when the motor is stopped.

In addition, the present invention is to reduce the twist of the laundry by appropriately setting the stop time of the pulsator during the forward and reverse rotation, to allow the laundry to spread evenly in the washing tank while rotating, by changing the attitude and position of the laundry Improve the cleaning effect

In addition, in the present invention, the rhythm flow can be formed by varying the rotational speed of the pulsator 130, and as a result, rhythm washing can be implemented. That is, when the rotational speed of the pulsator 130 is controlled to be sharply variable, it is possible to prevent damage to the laundry while forming a strong stream and a rhythm stream.

The rotation speed of the washing tub 120 and the pulsator 130 is controlled by the control unit 500 to be applied to the inner and

outer coils

66 and 68 by controlling the first driver 530 and the second driver 540. This can be achieved by varying the voltage magnitude and the current amount of the first drive signal and the second drive signal.

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

In the above description of the embodiment, a washing machine driving method using the washing machine driving device 150 according to the first embodiment employing the driving motor 140 has been described, but the present invention provides a second embodiment employing the driving motor 140a. The same may be applied to a washing machine driving method using the washing machine driving device 150a according to an example.

As shown in FIG. 13, the washing machine driving device 150a according to the second embodiment employing the driving motor 140a includes an outer shaft 20 connected to the washing tub 120, and an inside of the outer shaft 20. An inner shaft 30 rotatably disposed on the inner shaft 30 connected to the pulsator 130, an outer rotor 50 connected to the outer shaft 20, and an inner rotor 40 connected to the inner shaft 30; And a stator 60 disposed with a gap between the inner rotor 40 and the outer rotor 50.

The washing machine driving device 150a according to the second embodiment has a difference in the output structure of the washing machine driving device 150 and the rotor according to the first embodiment, and with this, the bearing support structure may be changed.

In the second embodiment, the structure of the drive motor 140a of the inner rotor 40, the outer rotor 50, and the stator 60 is the same as that of the drive motor 140 of the first embodiment, and the second bearing 28 and the The two bearing housings 10 are also the same as in the first embodiment.

The outer shaft 20 may be configured as a single body as in the second embodiment, or may be made of 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 given the same reference numerals and detailed description thereof will be omitted.

The difference between the first and second embodiments is that the first bearing 26 is installed in the first bearing housing 102 separated from the stator support. However, similarly to the first embodiment, the first bearing 26 can also be installed in the first bearing housing which extends from the stator support.

The first bearing housing 102 is formed of a metal material, and extends outwardly from the first bearing seating portion 104 and the first bearing seating portion 104 on which the first bearing 26 is seated, and upwards. The connecting portion 106 is bent to form a cylindrical shape 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 108 is fixed to the outer tub 110 together with the flat plate 18 of the second bearing housing 10 by bolts 250.

The outer shaft 20 is formed with a first connecting portion 90 to which the outer rotor support 56 of the outer rotor 50 is connected, and the inner rotor support 46 of the inner rotor 40 under the inner shaft 30. ) Is connected to the second connection portion 92 is formed.

Here, the first connecting portion 90 is disposed below the first bearing 26, but when the first bearing 26 is installed in the first bearing housing formed extending from the stator support, the first connecting portion ( 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 outer shaft is as long as the length of the first connecting portion formed under the first bearing 26 of the existing outer shaft. It is possible to reduce the length of, 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 amount, which is easy and convenient for the user to top-load the laundry. If the overall height is the same, the size of the washing tub can be increased, thereby increasing the washing machine capacity.

The stator 60 includes a plurality of stator cores 62 arranged radially, a bobbin 64 which is a nonmagnetic material wrapped around the outer circumferential surface of the stator core 62, and an inner stator coil wound around one side of the stator core 62. (66), an outer stator coil (68) wound on the other side of the stator core (62), and a stator support (230) on which the stator core (62) is arranged in an annular shape and fixed to the outer tub (110).

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

The stator support 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 bent at a right angle to extend upward. And an outer tub fixing portion 236 that is bent at an upper side of the connecting portion 234 and extended outward and fixed to the outer tub 110.

In the washing machine driving device 150a according to the second embodiment, the inner rotor 40 has a smaller driving torque than the outer rotor 50, and the pulsator 130 requires less torque than the washing tub 120. The inner rotor 40 can sufficiently rotate the pulsator 130.

Therefore, 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 greater torque than the inner rotor 40, and the washing tub 120 requires a larger torque than the pulsator 130.

The drive motor 140a according to the second embodiment is connected to the washing tank 120 in which the outer rotor 50 having a large drive torque requires a large torque, and has a relatively smaller torque than the outer rotor 50. Since the inner rotor 40 is connected to the pulsator 130 which requires a relatively small torque compared to the washing tank, the inner rotor 40 may improve the performance of the washing machine and reduce the current consumption.

Further, in the present invention, the drive torque of the outer rotor using a low-cost ferrite magnet can be equally implemented by using a high-magnet magnet of a rare earth system such as an Nd magnet to increase the drive torque of the inner rotor 40. As a result, in the present invention, as shown in Examples 1 to 4, the pulsator and the washing tank may be simultaneously driven during the washing stroke and the rinsing stroke to form various washing water streams and rinsing patterns using the twin power.

In the above description of the embodiment, a BLDC motor having a radial gap type double rotor-double stator structure is used as a driving motor, but a BLDC motor having an axial gap type double rotor double stator structure is used as a driving power source. It can be used as a drive motor, and any drive motor of different structure and different way can be used as long as the power source generates a pair of outputs.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

The present invention can be used to form a variety of washing water flows including washing water flow in the opposite direction without using an expensive torque converter using a twin-drive drive motor that implements the drive torque of the inner rotor and the outer rotor similarly Washing machine drive and its control, in particular fully automatic washing machine.

Claims

A double rotor-double stator drive motor having an inner rotor and an outer rotor that can be independently controlled by a double stator, and selectively generating an inner rotor output and an outer rotor output;

An inner shaft which transmits the outer rotor output or the inner rotor output to a pulsator;

An outer shaft rotatably coupled to an outer circumference of the inner shaft and transmitting the inner rotor output or the outer rotor output to a washing tub; And

And a control unit for independently applying the first and second driving signals to the double stator to control the inner rotor and the outer rotor,

The control unit has a stop time when the pulsator switches the rotational direction clockwise and counterclockwise during the washing stroke, and the washing tank is started before the clockwise and counterclockwise driving time of the pulsator is finished. Washing machine drive device characterized in that the control is made to drive in the direction opposite to the rotation direction of the pulsator.
The method of claim 1,

The driving of the washing tank is a washing machine driving apparatus characterized in that it is extended to drive after the stop time of the pulsator.
The method of claim 1,

The washing tank is driven in a direction opposite to the rotation direction of the pulsator at the same time as the clockwise and counterclockwise start of the pulsator, the washing machine driving device characterized in that the drive is shorter than the driving time of the pulsator.
The method of claim 1,

Driving time and stop time of the pulsator is a washing machine drive device, characterized in that set in the range 1.5: 1 to 10: 1.
The method of claim 1,

Washing machine drive device characterized in that the overshoot driving is performed during the start and stop operation of the pulsator.
The method of claim 1,

Washing machine drive device characterized in that the ramp-up drive is performed at the time of starting the pulsator.
The method of claim 1,

The pulsator is driving the washing machine, characterized in that driven at a variable speed.
The method of claim 1,

The stop of the pulsator is a washing machine drive device characterized in that to perform an electromagnetic brake using a driver for driving the outer rotor.
The method of claim 1,

The driving torque of the inner rotor is set to be equal to the driving torque of the outer rotor.
The method of claim 9,

The inner rotor uses a rare earth magnet, and the outer rotor uses a ferrite magnet.
The method of claim 1,

The outer rotor

A plurality of second magnets arranged at an outer surface of the stator with a predetermined gap and N poles and S poles alternately arranged;

A second back yoke disposed on a rear surface of the second magnet; And

An outer rotor support for supporting the second magnet and the second back yoke,

The outer rotor support is

An outer flat portion facing the inner and outer stator coils of the stator in a cup-shaped bottom surface;

Inner flat portion which is engaged with the inner shaft,

It includes an inclined connecting portion connecting the outer flat portion and the inner flat portion,

The outer flat portion is provided with a first and second through hole for discharging the heat generated from the inner and outer stator coil to the outside in the portion facing the inner and outer stator coil, respectively.
The method of claim 11,

The outer rotor support is

A plurality of radial reinforcing ribs protruding radially at regular angles on the outer and inner circumferential surfaces thereof; And

Washing machine drive device comprising a first to third circumferential reinforcing ribs formed on the inner circumferential surface at intervals in the circumferential direction.
The method of claim 1,

The control unit

The pulsator is driven to rotate in a first direction for a first period of time,

Before the first period ends, the washing tank is rotated in a direction opposite to the first direction for a second period,

Stopping the pulsator according to the passage of the first period,

And a washing machine configured to stop the washing tank according to the elapse of the second period after the elapse of the first period.
A water bath containing wash water;

A washing tank rotatably disposed in the outer tub to perform washing and dehydration;

A pulsator rotatably disposed in the washing tank to form a washing stream; And

A washing machine comprising a washing machine driving device according to any one of claims 1 to 13, which simultaneously or selectively drives the washing tank and the pulsator.
A first step of rotating the pulsator in the first direction during the first period;

A second step of rotating the washing tub in a direction opposite to the first direction for a second period before the first period ends;

Stopping the pulsator in accordance with the passage of the first period;

A fourth step of stopping the washing tub according to the passage of the second period after the passage of the first period; And

And a fifth step of sequentially setting rotation directions of the pulsator and the washing tank in the first to fourth steps, respectively, when the pulsator stop time elapses after the second period elapses. Washing machine driving method characterized in that.