KR20210075000A - Washing apparatus - Google Patents

Abstract

The present invention is to provide a drum type washing machine that can reduce power consumption while maintaining excellent washing performance. A washing machine includes a water tub; a drum rotatably provided in the water tub; a pulsator rotatably provided in the drum; a driving unit for driving the drum and the pulsator; and a control unit for controlling the driving unit to rotate the pulsator in a second direction while rotating the drum in a first direction. The control unit can control the driving unit to drive the pulsator based on the position of laundry accommodated in the drum during rotation of the drum.

Description

washing machine {WASHING APPARATUS}

The disclosed invention relates to a drum type washing machine.

In a drum type washing machine, laundry and a small amount of water are accommodated in drums in a horizontally arranged water tank. Drum-type washing machines are configured to wash (so-called “tapping and sucking”) laundry using a mechanical action that lifts and falls while the drum rotates. Therefore, in the drum type washing machine, the amount of water for washing is reduced compared to the vertical type washing machine.

A drum-type washing machine capable of independently rotating a drum and a pulsator is known. In particular, Japanese Unexamined Patent Publication No. 2018-86232 discloses a technique for improving cleaning performance by performing opposite washing in which the drum and the pulsator are rotated in opposite directions to wash in a drum type washing machine.

However, in the conventional drum-type washing machine, power consumption increases because the drum and the pulsator are rotated in opposite directions to perform upper half washing.

Accordingly, the disclosed invention is to provide a drum-type washing machine capable of reducing power consumption while maintaining excellent washing performance of washing the upper half.

According to the disclosed invention, a washing machine comprises: a drum rotatably provided in the water tank; a pulsator rotatably provided in the drum; a driving unit for driving the drum and the pulsator; and a control unit for controlling the driving unit to rotate the pulsator in a second direction while rotating the drum in the first direction. The control unit may control the driving unit to drive the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum.

The control unit, based on the position of the laundry accommodated in the drum during rotation of the drum, may control the driving unit to change the rotation speed of the pulsator.

The control unit controls the driving unit to rotate the pulsator at a first speed based on the laundry being positioned below the first reference position during rotation of the drum, and the laundry is rotated during the rotation of the drum Based on being positioned above a second reference position higher than the first reference position, the driving unit may be controlled to rotate the pulsator at a second speed greater than the first speed.

The control unit controls the driving unit to rotate the pulsator at a first speed based on the laundry being positioned at the low point of the drum during rotation of the drum, and the laundry is moved to the drum during rotation of the drum Based on being located at the high point of, it is possible to control the driving unit to rotate the pulsator at a second speed greater than the first speed.

The control unit may control the driving unit to change the torque limit of the driving unit for rotating the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum.

The control unit may control the driving unit to change the rotation speed of the pulsator based on a driving current of the driving unit for rotating the drum.

The control unit controls the driving unit to rotate the pulsator at a first speed based on that the driving current is greater than the first reference current during one rotation period of the drum, and during one rotation period of the drum The driving unit may be controlled to rotate the pulsator at a second speed greater than the first speed based on the drive current being smaller than the second reference current smaller than the first reference current.

The control unit controls the driving unit to rotate the pulsator at a first speed based on the maximum value of the driving current during one rotation period of the drum, and the driving current is the minimum during one rotation period of the drum Based on the value, it is possible to control the driving unit to rotate the pulsator at a second speed greater than the first speed.

The control unit may control the driving unit to change a torque millimeter of the driving unit for rotating the pulsator, based on a driving current of the driving unit for rotating the drum.

According to the disclosed invention, a control method of a washing machine including a water tank, a drum rotatably provided in the water tank, and a pulsator rotatably provided in the drum, while rotating the drum in a first direction, rotate in the direction; It may include varying the rotation of the pulsator based on the position of the laundry accommodated in the drum during the rotation of the drum.

Varying the rotation of the pulsator, based on the position of the laundry accommodated in the drum during the rotation of the drum, may include changing the rotation speed of the pulsator.

In the washing cycle or rinsing of the washing machine, the first direction may be different from the second direction, and in the spin-drying cycle of the washing machine, the first direction may be the same as the second direction.

Changing the rotation speed of the pulsator may include: rotating the pulsator at a first speed based on the laundry being positioned below the first reference position during rotation of the drum; Based on the fact that the laundry is positioned above a second reference position higher than the first reference position during rotation of the drum, it may include rotating the pulsator at a second speed greater than the first speed.

12. The method of claim 11, wherein changing the rotation speed of the pulsator comprises: rotating the pulsator at a first speed based on the laundry being positioned at the bottom of the drum during rotation of the drum; Based on the laundry being positioned at the high point of the drum during rotation of the drum, it may include rotating the pulsator at a second speed greater than the first speed.

Varying the rotation of the pulsator, based on the position of the laundry accommodated in the drum during rotation of the drum, may include changing the torque limit for rotating the pulsator.

Varying the rotation of the pulsator may include changing the rotation speed of the pulsator based on a driving current for rotating the drum.

Changing the rotation speed of the pulsator may include: rotating the pulsator at a first speed based on the driving current being greater than a first reference current during one rotation period of the drum; It may include rotating the pulsator at a second speed greater than the first speed based on the drive current being smaller than a second reference current smaller than the first reference current during one rotation period of the drum.

Changing the rotation speed of the pulsator may include rotating the pulsator at a first speed, based on the maximum value of the driving current during one rotation period of the drum; Based on the minimum value of the driving current during one rotation period of the drum, it may include rotating the pulsator at a second speed greater than the first speed.

Varying the rotation of the pulsator, based on a driving current for rotating the drum, may include changing a torque millimeter for rotating the pulsator.

In the washing cycle or rinsing of the washing machine, the first direction may be different from the second direction, and in the spin-drying cycle of the washing machine, the first direction may be the same as the second direction.

According to the drum type washing machine of the disclosed invention, it is possible to reduce power consumption while maintaining the excellent cleaning performance of the upper half washing.

1 is a schematic cross-sectional view of a drum-type washing machine according to the present embodiment.
FIG. 2 is an enlarged view of the main part of FIG. 1 .
3A is an exploded perspective view of a main part of a drum-type washing machine according to the present embodiment.
Fig. 3B is an assembly explanatory view of a portion enclosed by a dashed-dotted line in Fig. 2;
4 is a schematic perspective view of the pulsator of the drum-type washing machine according to the present embodiment.
5 is a cross-sectional view taken along line I - I of FIG. 4 .
6 is a schematic side view of the pulsator of the drum type washing machine according to the present embodiment.
7 is a block diagram showing the main part of the function of the control device of the drum type washing machine according to the present embodiment.
8 is a view showing an example of driving control of the pulsator when washing with a drum type washing machine according to the present embodiment.
9 is a view showing an example of the drum side phase current and the pulsator side phase current when washing with the drum type washing machine according to the present embodiment.
10 is a diagram illustrating an example of a drum side phase current and a pulsator side phase current when washing with a drum type washing machine according to a comparative example.
11A is a view showing a state when the unbalanced is located in the lower part of the drum during washing with the drum type washing machine according to the comparative example.
11B is a view showing a state when an unbalanced position is located on the upper part of the drum during washing with a drum type washing machine according to a comparative example.
12 is a diagram showing the relationship between the magnitude of the speed control gain of the pulsator and the time change of the rotation speed of the pulsator.
13 is a block diagram showing the main part of a function of a control device of a drum-type washing machine according to a modified example.
14 is a flowchart illustrating an example of driving control of a pulsator when washing with a drum-type washing machine according to a modification.
15A is a diagram illustrating an example of a drum-side phase current and a pulsator-side phase current when an amount of unbalance is small during washing with a drum-type washing machine according to a modification.
15B is a diagram illustrating an example of a drum-side phase current and a pulsator-side phase current when the amount of unbalance during washing with a drum-type washing machine according to a modification is large.

Like reference numerals refer to like elements throughout. This specification does not describe all elements of the embodiments, and general content in the technical field to which the disclosed invention pertains or content overlapping between the embodiments is omitted. The term 'part, module, member, block' used in the specification may be implemented in software or hardware, and according to embodiments, a plurality of 'part, module, member, block' may be implemented as one component, It is also possible for one 'part, module, member, block' to include a plurality of components.

Throughout the specification, when a part is "connected" with another part, it includes not only direct connection but also indirect connection, and indirect connection includes connection through a wireless communication network. do.

In addition, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

Throughout the specification, when a member is said to be located “on” another member, this includes not only a case in which a member is in contact with another member but also a case in which another member is present between the two members.

Terms such as 1st, 2nd, etc. are used to distinguish one component from another component, and the component is not limited by the above-mentioned terms.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In each step, the identification code is used for convenience of description, and the identification code does not describe the order of each step, and each step may be performed differently from the specified order unless the specific order is clearly stated in the context. have.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the disclosed invention will be described with reference to the drawings. Here, the description of the preferred embodiment below is merely illustrative in nature, and is not intended to limit the disclosed invention, its application, or its use.

Hereinafter, embodiments of the disclosed invention will be described in detail with reference to the drawings. Here, the following description is merely illustrative in nature, and does not limit the disclosed invention, its application, or its use.

<Basic configuration of drum washing machine>

1 and 2 show a drum type washing machine 1 according to the present embodiment. The drum washing machine 1 includes a housing 10, a water tank 20, a drum (rotating tank) 30, a pulsator (agitator) 40, a motor (drive device) 50, and a controller (control device) Including (60), each cycle of washing, rinsing, and spin-drying is configured to be automatically executed (fully automatic) according to a set program.

The housing 10 may have a rectangular box shape having an upper surface portion 10a, a lower surface portion 10b, a pair of left and right side portions 10c and 10c, a front portion 10d, and a rear portion 10e. A circular inlet 12 that is opened and closed by the door 11 is formed at approximately the center of the front portion 10d. Laundry can be entered through the inlet (12). An operation unit 13 on which a switch or the like is disposed is installed on the upper portion of the front portion 10d, and the controller 60 is built-in behind it.

The water tank 20 may be a cylindrical container having a bottom having an opening 20a having a diameter smaller than the inner diameter at one end thereof. The opening 20a may face the inlet 12 . The water tank 20 is installed in the housing 10 in a state in which the center line of the water tank 20 is horizontally arranged to extend in an approximately horizontal direction. During washing or rinsing, water for washing and water for rinsing are stored in the lower portion of the water tank 20 .

Here, in this embodiment, as shown in FIG. 1, the side of the inlet 12 in the horizontal direction is “before” and the opposite side is “after”, and the side where the washing water or rinsing water is stored in the water tank 20 in the vertical direction. Define "below" and the opposite as "above".

The drum 30 may be a cylindrical container having an opening 30a at one end and a bottom (bottom) at the other end. The drum 30 is accommodated in the water tank 20 so that the opening 30a faces forward. The opening 30a has an inner diameter smaller than the body portion of the drum (a portion of a wrapper 33 described later). The drum 30 is rotatable about a rotating shaft J extending in the front-rear direction, and washing, rinsing, and spin-drying operations are performed in a state in which the laundry is accommodated in the drum 30 . At this time, a baffle is provided on the inner peripheral surface of the drum 30 .

As shown in detail in FIGS. 4 to 6 , the pulsator 40 may be a disk-shaped member having an approximately conical front surface with a low apex, and is disposed at the bottom of the drum 30 . A protrusion (wing) 45 extending in the radial direction is provided on the front surface of the pulsator 40 . The pulsator 40 is rotatable about the rotating shaft J independently of the drum 30 .

As shown in FIG. 2 , a dual shaft 70 including an inner shaft 71 and an outer shaft 72 is installed in a state of penetrating the bottom surface of the water tank 20 with the rotation axis J as the center. The outer shaft 72 is a cylindrical shaft having a shorter shaft length than the inner shaft 71 . The inner shaft 71 is rotatably pivotally supported inside the outer shaft 72 through the inner bearing 73 . The outer shaft 72 is rotatably supported by the bearing housing 23a of the water tank 20 through the outer bearing 74 .

The drum 30 is supported by being connected to the upper end of the outer shaft 72 , and the pulsator 40 is connected to and supported by the upper end of the inner shaft 71 . The outer shaft 72 and the inner shaft 71 are connected to a motor 50 disposed on the rear side of the water tank 20 .

The motor 50 may independently drive each of the outer shaft 72 and the inner shaft 71 . The controller 60 includes hardware such as a CPU (processor) or memory, and software such as a control program, and comprehensively controls the drum-type washing machine 1, and performs washing, rinsing, Each stroke such as dehydration can be automatically operated.

<Detailed configuration of drum washing machine>

As shown in Fig. 3a, the drum 30 includes an annular (ring)-shaped drum front 31 having an opening 30a formed therein, and a ring-shaped drum bag 32 facing the front and rear of the drum front 31, and, It includes a rapper 33 having a cylindrical shape connecting the drum front 31 and the drum back 32 .

A plurality of water-through holes 33a penetrating inside and out are formed in the wrapper 33 , and water stored in the water tank 20 may be introduced into the drum 30 through the water-through holes 33a. Each water-through hole 33a has a substantially burring shape, and protrudes in a spherical shape on the inner surface side of the drum 30 . The water hole 33a may be formed in the drum front 31 or the drum bag 32 or the pulsator 40 as well as the rapper 33 .

The drum front 31 and the rapper 33 are integrally or detachably connected by caulking or screwing. Similarly, the wrapper 33 and the drum bag 32 are integrally or detachably connected by caulking or screwing.

The drum 30 is fixed to the outer shaft 72 through a disk-shaped flange shaft (flange member) 34 assembled at the bottom thereof. The flange shaft 34 and the outer shaft 72 are integrated by press-fitting the outer shaft 72 into the flange shaft 34 for work efficiency during assembly, or the outer shaft 72 is insert-molded into the flange shaft 34 . Thus, it can be formed integrally.

In the case of assembling and integrating the flange shaft 34 to the drum 30 , the flange shaft 34 may be fixed by fastening with screws or the like from the outer peripheral side of the wrapper 33 to facilitate assembly. When the drum 30 is composed of a plurality of parts, the bending portion of the drum bag 32 may be fastened together between the wrapper 33 and the flange shaft 34 . The drum bag 32 may be fixedly assembled to the flange shaft 34 first, and then the wrapper 33 and the flange shaft 34 may be fastened.

The assembly of the drum 30 and the flange shaft 34 of the drum washing machine 1 is shown in detail in FIG. 3B . The wrapper 33 or the drum bag 32 may be formed by bending or pressing a metal plate. Therefore, by mounting and integrating the annular drum front 31 and the drum back 33 on the inner edge of the front end and the inner edge of the rear end of the cylindrical wrapper 33, structurally the strength and rigidity of the drum 30 are secured.

Further, the drum bag 32 includes a cylindrical outer fitting portion 32a and an annular flange portion 32b protruding inward from the front end portion of the outer fitting portion 32a. On the central side of the annular flange portion 32b, a protrusion 32c bulging with a gentle inclination toward the front is formed, and an inner end face of the protrusion 32c constitutes a rear opening 32d that opens circularly.

The outer diameter of the outer fitting portion 32a is approximately equal to the inner diameter of the wrapper 33 , and the wrapper 33 is coupled to the outer fitting portion 32a. The inner diameter of the outer fitting portion 32a is approximately equal to the outer diameter of the outer end face of the flange shaft 34 , and the outer fitting portion 32a is coupled to the outer end face of the flange shaft 34 . The inner end surface (cylindrical portion) of the protrusion 32c is slightly larger than the outer diameter of the pulsator 40 , and faces the outer peripheral portion of the pulsator 40 with a slight gap (gap).

At a plurality of locations of the rear end of the wrapper 33, an outer insertion through hole 33b is formed. A plurality of inner through-holes 32e are also formed in the outer fitting portion 32a so as to overlap the outer through-holes 33b, respectively. In addition, fastening holes 34a overlapping with these outer insertion through-holes 33b and inner insertion through-holes 32e are also formed at a plurality of locations on the outer end surface of the flange shaft 34 .

When assembling the wrapper 33, the drum bag 32, and the flange shaft 34, as shown in FIG. 3B, first, the drum bag 32 is connected to the flange shaft so that the outer fitting part 32a is coupled to the outer peripheral end surface. (34) is fitted and fixed. Thereafter, the rear end of the wrapper 33 is fitted into the outer fitting portion 32a, and the fastening mechanism T is provided in the outer through-hole 33b, the inner through-hole 32e, and the fastening hole 34a, respectively, which are overlapped with each other. ) is fastened radially outward. By doing so, the wrapper 33, the drum bag 32 and the flange shaft 34 are engaged.

In this way, the flange shaft 34 excellent in strength and rigidity has a large diameter approximately equal to the diameter of the wrapper 33 (that is, the drum 30), and is radially outward from the wrapper 33 together with the drum bag 32. By being fastened together in the integrated, the strength and rigidity of the drum 30 can be improved. In addition, even if it rotates and shakes in the lateral direction, the drum 30 can be stably supported.

When the drum 30 is composed of a single part, by fastening the drum bag 32 and the flange shaft 34 with a screw or the like at the front of the wrapper 33 rather than on the outer peripheral side of the wrapper 33, the flange shaft ( 34) may be fixed.

When the flange shaft 34 and the outer shaft 72 are not integrated by insert molding or press-fitting, there is a serration or a key at the connection portion between the flange shaft 34 and the outer shaft 72 . By providing the anti-rotation structure comprising the concave-convex coupling by means of a keyway or the like, rotation in the rotational direction (slip between the flange shaft 34 and the outer shaft 72) is suppressed. After the flange shaft 34 and the outer shaft 72 are detachably coupled to make them non-rotatable, they are fastened in the axial direction with a nut or bolt, so that movement in the axial direction is suppressed.

A ball bearing or a sliding bearing may be used as the inner bearing 73 . An inner bearing 73 is press-fitted to one side of the outer shaft 72 and the inner shaft 71 , and the inner bearing 73 is fitted to the other side of the outer shaft 72 and the inner shaft 71 . One side of each end of the outer shaft 72 and the inner shaft 71 has a step portion having a size different from the outer diameter of the main shaft portion due to flange formation or snap ring mounting, and this step portion abuts against the inner bearing 73 is fixed A washer or the like may be provided between the outer shaft 72 or the inner shaft 71 and the inner bearing 73 .

The other end of each end of the outer shaft 72 and the inner shaft 71 may be fixed with a snap ring or the like in order to prevent misalignment or omission during transport or assembly. A washer or the like may be provided on the other side as well. At the end of the double shaft 70 on the water tank 20 side, a seal member is mounted to prevent water intrusion into the inside of the double shaft 70 or water leakage through the double shaft 70 to the outside of the water tank 20 .

The water tank 20 is composed of two or more parts. The water tank 20 may be configured to be divided into up and down or left and right, etc., but the most effective may be divided into two in the front and rear direction. Therefore, in the drum type washing machine 1, the water tank 20 is composed of two articles including the tub front 22 and the tub back 23 divided back and forth as shown in FIG. 3A. A seal structure for preventing water leakage is provided at the joint portion of the water tank 20 .

An opening 20a is formed at the front end of the tub front 22 . A bearing housing 23a is installed at the rear end of the tub bag 23 . The tub bag 23 and the bearing housing 23a may be made of different materials. The tub bag 23 and the bearing housing 23a are configured as separate parts, and the bearing housing 23a may be fixed to the tub bag 23 with a bolt or the like. In this case, a seal structure is required at the joint site. Therefore, the bearing housing 23a and the tub bag 23 may be integrally formed by insert molding. The tub bag 23 and the bearing housing 23a may be integrally formed of the same material, but aluminum die-casting may not be realistic in terms of weight, size, and cost. In addition, the bearing housing 23a may be formed by combining a metal plate such as an iron plate or stainless steel plate. In this drum type washing machine 1, the bearing housing 23a (aluminum die-casting material) and the tub bag 23 (resin material) are integrally formed by insert molding.

The bearing housing 23a includes a shaft support 24 for supporting the outer shaft 72 via the outer bearing 74 . The bearing housing 23a may also be composed of two or more parts. The outer shaft 72 is axially supported by two or more external bearings 74 spaced apart from each other in the axial direction in the bearing housing 23a. The outer bearing 74 is press-fitted to either side of the outer shaft 72 and the bearing housing 23a, and the other side of the outer shaft 72 and the bearing housing 23a is inserted into the outer bearing 74 with a gap.

Since the front of the tub bag 23 is released, the outer shaft 72 is formed in the center of the bearing housing 23a from the front of the tub bag 23 even though the outer shaft 72 is integrated with the flange shaft 34. 24) can be inserted. When the outer shaft 72 is a member separate from the flange shaft 34 , the outer shaft 72 may be inserted into the shaft support 24 from the rear of the tub bag 23 .

When the outer shaft 72 is fitted to the outer bearing 74 , the outer shaft 72 may have the same outer diameter in the entire length direction, or the outer diameter of the insertion start side may be smaller than the outer diameter of the insertion end side. On the other hand, when the external bearing 74 press-fitted to the outer shaft 72 is fitted to the shaft support part 24 , the shaft support part 24 has an internal diameter equal to or greater than that of the external bearing 74 at least, and the insertion start side position may be greater than the inner diameter of the insertion end side. In this case, the case in which the bearing housing 23a is composed of two or more parts is not limited thereto. In addition, the size of the front outer bearing 74 may be larger than that of the rear outer bearing 74 so that it can be stably supported by being inserted from the front side of the tub bag 23 .

The pulsator 40 includes a boss part 41 positioned in the center of the pulsator 40, and a disk part 42 positioned around the boss part 41, as shown in FIG. As shown in FIG. 2 , the boss part 41 is fixed to the protruding end of the inner shaft 71 . Between the boss part 41 and the inner shaft 71, the rotation in the rotational direction (slip between the boss part 41 and the inner shaft 71) is prevented by an uneven coupling (rotation prevention structure) such as a serration or a key. is suppressed

In terms of strength, the boss part 41 and the disk part 42 may be composed of two or more parts having different materials. When the disk part 42 and the boss part 41 are made of the same material, the strength may be weak. That is, it is difficult to employ a metal having excellent strength, such as aluminum or stainless steel, because the inertia force increases and the energy loss increases as the weight of the pulsator 40 increases. can be Accordingly, the boss portion 41 may be made of a strength member such as stainless steel to have a minimum size, and the disk portion 42 may be formed of a lightweight resin or the like. The boss part 41 is fixed to the disk part 42 by press-fitting, insert molding, or the like. The front surface of the disk portion 42 may be made of resin, or the like, but may be covered with a thin plate such as stainless steel to prevent appearance or scratching.

In addition, the disk portion 42 may be formed of a stainless steel plate. When the disk portion 42 is formed of resin or the like, the thickness of the resin is required to be about 3 to 5 mm in order to secure a certain strength, but in the case of a stainless steel plate, the thickness may be about 1 mm. By doing so, one layer capacity can be increased.

The boss part 41 is detachably inserted into the protruding end of the inner shaft 71 by concave-convex coupling, and is coupled so as not to fall out by fastening using bolts or nuts. In order to prevent damage to the laundry due to the fastening portion, a protective cap 43 (protective part) is mounted on the apex of the boss 41 . A labyrinth structure is formed in the gap between the pulsator 40 and the drum 30 to surround the end of the pulsator 40 with a small gap in order to prevent the laundry from being caught. The labyrinth structure is generally formed of a drum bag 32 and a pulsator 40 . Accordingly, the outer diameter of the pulsator 40 may be less than 100% and 60% or more of the inner diameter of the drum 30 . If the outer diameter of the pulsator 40 is 60% or more of the inner diameter of the drum 30 , the function of the pulsator 40 such as agitation may be properly exhibited inside the drum 30 .

In particular, the outer diameter of the pulsator 40 may be smaller than the inner diameter of the opening (30a). Then, since the pulsator 40 can be inserted into the inside of the drum 30 through the opening 30a, the pulsator 40 after assembling the drum 30 can be mounted on the drum 30, , the manufacturing of the drum type washing machine 1 is simplified. In addition, when a defect occurs in the pulsator 40 after using it for a long time by the user, it is easy to replace the parts of the drum type washing machine 1, and the cost borne by the user can also be reduced.

On the other hand, when the outer diameter of the pulsator 40 is larger than the opening 30a, the pulsator 40 is inserted into the drum 30 from the rear. In this case, since the pulsator 40 is inserted into the drum 30 before the work in which the wrapper 33 and the drum bag 32 are integrated by caulking or welding, the manufacturing of the drum washing machine 1 becomes complicated. can Accordingly, in the stage before the rapper 33 and the drum bag 32 are integrated, the pulsator 40 is fixed to the inner shaft 71 via the flange shaft 34 or the rapper 33 and the drum bag 32 can be made detachable by fixing screws, etc.

In addition, by constructing the above-mentioned labyrinth structure with three or more parts in which the flange shaft 34 is added to the drum bag 32 and the pulsator 40, the pulsator 40 is a drum bag 32 and a rapper ( 33) can be integrated and then assembled. That is, by configuring the wall covering the outside of the pulsator 40 with the drum bag 32, and the flange shaft 34 constitutes the wall covering the rear side and the inside of the pulsator 40 with other parts, the above-described Assembly is possible. At this time, in order to avoid an increase in the number of parts, the wall covering the rear side and the inner side of the pulsator 40 may be configured as a flange shaft 34 . The outer wall of the pulsator 40 may be composed of a flange shaft 34 or the like instead of the drum bag 32, but in this case, there is a gap near the inner surface of the drum 30 that the laundry can come into contact with, thereby causing damage to the laundry. Since there is a possibility of giving, the drum bag 32 is preferable.

By providing the maze structure as described above, even when the outer diameter of the flange shaft 34 is made larger than the outer diameter of the pulsator 40, laundry is drawn between the pulsator 40 and the drum 30, or the pulsator Intrusion of foreign substances between the eater 40 and the flange shaft 34 may be prevented.

<Detailed structure of the motor 50>

As shown in FIG. 2 , the motor 50 has a flat cylindrical appearance having a diameter smaller than that of the water tank 20 , and is assembled to the bearing housing 23a of the water tank 20 so that the rotating shaft J passes through the center thereof. do. The motor 50 is mainly composed of a stator 51 , an inner rotor (first rotor) 52 , an outer rotor (second rotor) 53 , an inner shaft 71 , and an outer shaft 72 . The stator 51 is formed of an annular (ring)-shaped member having an outer diameter smaller than the inner diameter of the outer rotor 53 and a larger inner diameter than the outer diameter of the inner rotor 52 . The inner rotor 52 and the outer rotor 53 are connected to the pulsator 40 or the drum 30 without a clutch or an acceleration/deceleration device, and are configured to directly drive them. The inner shaft 71 and the outer shaft 72 are connected to a motor 50 which is a driving device.

The inner rotor 52 and the outer rotor 53 are driven by one inverter (three-phase inverter). The inner rotor 52 and the outer rotor 53 share a coil of the stator 51, respectively, and can be independently rotationally driven by supplying current to the coil. In the case of the motor 50, when the two rotors 52 and 53 rotate in the same direction and when they rotate in the opposite direction, the rotation speed per unit time ratio of the two rotors is, for example, 1:1, 1:- It may be a fixed value such as 2. The switching of each rotational direction in the same direction and the opposite direction is made by magnetization, and the ratio of the rotational speed per unit time in the same direction and the opposite direction may be different. In the drum washing machine 1 , the outer rotor 53 and the inner rotor 52 may be rotationally driven in a plurality of rotation modes according to a control instruction from the controller 60 .

The outer rotor 53 is a cylindrical member having a flat bottom, a bottom surface portion 121 having an open center portion, a rotor yoke 122 erected on the edge of the bottom surface portion 121, and a permanent magnet in the shape of an arc. It includes a plurality of outer magnets 124 made of. The bottom surface portion 121 and the rotor yoke 122 are formed by pressing an iron plate to function as a back yoke. The inner rotor 52 is a flat cylindrical member having an outer diameter smaller than that of the outer rotor 53 , an inner support surface portion 131 having an open central portion, an inner circumferential wall portion 132 built around the inner support surface portion 131 and , and a plurality of inner magnets 134 made of a square plate-shaped permanent magnet. A rotor core 133 is disposed between the inner magnets 134 in the circumferential direction.

The inner shaft 71 is a cylindrical shaft member, and is rotatably supported by a bearing bracket 70 through an inner bearing 73 and an outer shaft 72 . The lower end of the inner shaft 71 is connected to the outer rotor 53 . The upper end of the inner shaft 71 is connected to the pulsator 40 . The outer shaft 72 is a cylindrical shaft member that is shorter than the inner shaft 71 and has an inner diameter greater than the outer diameter of the inner shaft 71, and includes an upper and lower inner bearing 73, an inner shaft 71 and an outer bearing ( It is rotatably supported by the bearing bracket 70 through the 74). The lower end of the outer shaft 72 is supported by the shaft support 24 . The upper end of the outer shaft 72 is connected to the flange shaft 34 of the drum 30 .

In this case, the motor (drive device) 50 may be configured of any one of the following types or a combination thereof.

(Type 1)

In the motor 50 of type 1, an inner rotor 52 and an outer rotor 53 (dual motors) are arranged inside and outside one stator 51, respectively. The inner rotor 52 is connected to the outer shaft 72 , and the outer rotor 53 is connected to the inner shaft 71 . The two rotors 52 and 53 can be driven and controlled by one inverter The motor 50 of the drum washing machine 1 shown in Figs.

(Type 2)

The motor is the same dual motor as that of Type 1, and the two rotors 52 and 53 may be driven and controlled by two inverters, respectively. In the case of this motor, since the rotors 52 and 53 are individually driven and controlled by each inverter, the rotation speed per unit time ratio is adjustable, so that the rotation speed per unit time of each rotor 52 and 53 can be freely controlled.

(Type 3)

The motor is not a single stator, but a double stator structure of two layers inside and outside in which two stators are arranged back to back, and an inner rotor and an outer rotor are respectively arranged inside and outside the double stator structure. This motor may be equivalent to arranging two functionally independent motors side by side around the axis of rotation (J). In this motor, the two rotors are individually driven and controlled by two inverters.

(Type 4)

The two motors may be integrated by arranging side by side in the direction in which the rotating shaft J extends. The rotor of the front side motor close to the tub bag 23 is connected to the outer shaft 72 , and the rotor of the rear side motor is connected to the inner shaft 71 . These two motors are individually driven and controlled.

(Type 5)

Two common motors are used. However, unlike the above-described direct drive type motor, each motor rotationally drives the drum 30 and the pulsator 40 through a power transmission mechanism including a shaft, a pulley, and an endless belt.

(Type 6)

As with type 5, two normal motors (the first motor and the second motor) are used. However, the second motor may be an inner rotor type motor of a direct drive type having a rotor rotating about the rotation shaft (J) inside the stator. A pulley rotating about a rotating shaft J is provided outside the stator of the second motor, and an endless belt (power transmission mechanism) is hung on the pulley. The first motor is connected to the pulley through this power transmission mechanism. The pulsator 40 is driven by a first motor through a power transmission mechanism, and the drum is driven by a second motor.

When the above-mentioned motor 50 is mounted on the tub bag 23 or the bearing housing 23a, the motor 50 may be directly fixed thereto or indirectly through a bracket or the like. The motor 50 may be fixed using a bush having elasticity, such as rubber or resin, in order to block the vibration generated by the motor 50 from being transmitted to the tub bag 23 or the like. This fixing may be fastening using a bolt or a nut, and a washer, an anti-loosening spring washer, a wave washer, etc. that widens the range of the axial force may be provided between these fastening mechanisms.

<Detailed structure of the double shaft 70>

The dual shaft 70 includes an inner shaft 71 and an outer shaft 72 , and the rotation shaft J and the shaft center are provided on the cylindrical shaft support 24 provided in the center of the bearing housing 23a of the water tank 20 . installed to match.

The inner shaft 71 is an elongated cylindrical shaft member, and the outer shaft 72 is an elongated cylindrical shaft member having an inner diameter shorter than the inner shaft 71 and larger than the outer diameter of the inner shaft 71 . A pair of inner bearings 73 are installed vertically spaced apart from each other inside the outer shaft 72 . A ball bearing or a sliding bearing may be used as the inner bearing 73 . The inner shaft 71 is inserted into the outer shaft 72 and is rotatably supported by the inner bearing 73 . The inner bearing 73 is press-fitted to one side of the outer shaft 72 and the inner shaft 71 , and the other side of the outer shaft 72 and the inner shaft 71 is fitted to the inner bearing 73 . The front end of the inner shaft 71 protrudes from the front end of the outer shaft 72 , and the rear end of the inner shaft 71 protrudes from the rear end of the outer shaft 72 .

<Detailed structure of the pulsator (40)>

4, 5 and 6, the front surface of the pulsator 40 has a mildly inclined surface 44 that is gently inclined downward from the central boss 41 toward the outer periphery, and a plurality of protrusions 45 ) is provided. The gentle slope 44 constitutes a disk-shaped base that spreads out on the front surface of the pulsator 40, and each protrusion (wing) 45 protrudes from the surface of the base portion as if swollen. The mildly inclined surface 44 may have few irregularities to reduce resistance during rotation, and is formed to be approximately flat. Each of the protrusions 45 extends radially from the boss portion 41 and is radially arranged at regular intervals in the circumferential direction. When the protrusions 45 are unevenly arranged, the reaction force becomes non-uniform, so that the unevenly arranged protrusions may cause abnormal vibration.

The protrusion 45 of the pulsator 40 according to this embodiment is three, but the number of the protrusions 45 is preferably 2 to 8, and two or three are more preferable because excellent results are obtained. If the number of the protrusions 45 increases, it is difficult for laundry to squeeze between the protrusions 45, so that the effect of tapping or peeling the laundry with the protrusions 45 (washing effect) is reduced, and the fluidity of the laundry may be reduced. Accordingly, the cleaning power may decrease, and power consumption may also increase.

Small protrusions smaller than the protrusions 45 may be provided at regular intervals between the protrusions 45 of the gentle slope 44 . The effect of rubbing the laundry can be realized by these small projections.

Among the protrusions 45, the central portion near the boss 41 has a low frequency of contact with laundry under the rated capacity of the laundry (for example, 60% of the capacity of the drum 30), so that the effect may not be realized. can Accordingly, the amount of protrusion of the gentle slope 44 of the central portion of the protrusion 45 may be small. On the other hand, in the outer peripheral portion of the protrusion 45, the closer to the edge thereof, the higher the influence on the peeling performance (washing performance) of the laundry. Accordingly, the protrusion amount of the gentle slope 44 may be greater in the outer circumferential portion of the protrusion 45 than in the inner circumferential portion. However, if the protrusion amount of the protrusion 45 of the gentle slope 44 is increased, the torque required for the rotation of the pulsator 40 may also be increased. In addition, when the drum 30 and the pulsator 40 rotate in the opposite direction, the rotation of the drum 30 is because the force of the protrusion 45 acts in a direction that prevents the rotation of the drum 30 through the laundry. The required torque may also be increased. Therefore, it is not preferable that the protrusion amount of the outer peripheral side portion of the protrusion portion 45 is too large.

The shape of the protrusion 45 is described. Each of the protrusions 45 may have a bulge on the gentle slope 44 , and may have a shape extending in a straight line from the central boss 41 in the radial direction. For example, each protrusion 45 may have an inverted U-shape or an inverted V-shaped cross-section. In the outer peripheral side portion of each protrusion 45, a plurality of substantially flat inclined surfaces 45a are formed on both sides facing in the circumferential direction.

As shown in FIG. 6 , when the inclination angle θ of the inclined surface 45a with respect to the rotational axis J is small when the inclined surface 45a is viewed in the cross-sectional direction of the protrusion 45 (almost parallel to the rotational axis J) , since the laundry collides with the inclined surface 45a from the front, there is a possibility that the pulsator 40 is locked (locked) and cannot rotate or rotates like the laundry against driving depending on the state of the laundry. In addition, there is a possibility that an increase in noise or abnormal vibration may be caused. Accordingly, the inclination angle θ of the inclined surface 45a may be 15° or more. As the inclination angle θ increases, the rotational resistance of the pulsator 40 also decreases, so power consumption can also be reduced. On the other hand, the larger the inclination angle θ is, the more difficult it is for laundry to be caught, so the function of tapping or peeling laundry (washing function) may be deteriorated. Accordingly, the inclination angle θ of the inclined surface 45a may be 20° or less.

In particular, considering the balance, two inclined surfaces 45a having different inclination angles θ may be formed on each side of the outer peripheral portion of each protrusion 45 . Specifically, a first inclined surface 45a1 having a relatively large inclination angle θ1 is formed on the apex side of the protrusion 45, and a second inclined surface 45a1 having a relatively small inclination angle θ2 is formed on the bottom side of the projection 45. 45a2) may be formed.

As shown in Figure 2, the outer periphery of the pulsator 40 is disposed opposite to the inner peripheral surface of the drum 30 with a certain gap 200, so that the gap 200 is in contact with laundry to give a mechanical action A working surface 201 may be provided. In this way, when the drum 30 and the pulsator 40 rotate in opposite directions during washing, the laundry enters the gap 200 and the three-axis working surfaces 201 (specifically, the gap ( By contacting the laundry with the inner peripheral surface of the drum 30 facing 200, the bottom surface of the drum 30, and the outer peripheral surface of the protruding end surface of the protrusion 45), a mechanical action can be effectively applied to the laundry.

The pulsator 40 of the present embodiment has a substantially conical shape, but a concave portion may be provided. In this case, the outer peripheral portion of the disk portion 42 than the boss portion 41 may be located at the rear. If the outer periphery of the disk portion 42 protrudes forward, the laundry is crushed on that portion, and the weight of the laundry is added to the pulsator, so that the torque of the motor 50 driving the pulsator can be increased.

<Washing method>

The drum type washing machine 1 synthesizes the respective mechanical forces by opposing the rotating direction of the drum 30 and the rotating direction of the pulsator 40 during washing (upper washing), and the mechanical force is effectively applied to the laundry . Specifically, the number of revolutions per unit time of the drum 30 during washing may be set to, for example, about 50 to 80 rpm so that the laundry may adhere to the inner circumferential surface of the drum 30 by centrifugal force. In addition, the drum type washing machine 1 may rotate the pulsator 40 in a direction opposite to the rotation direction of the drum 30 . At this time, since the laundry is attached to the inner circumferential surface of the drum 30, the protrusion 45 of the pulsator 40 collides with the laundry and knocks the laundry, so that the mechanical force of the pulsator 40 is transmitted to the laundry .

In the upper half washing, if the rotation of the drum 30 is faster than that of the pulsator 40, the pulsator 40 may be pushed by the force of the laundry because the rotational moment of the laundry becomes greater than the rotational moment of the pulsator 40. . On the other hand, if the rotation of the pulsator 40 is faster than the drum 30, the mechanical force of the pulsator 40 can be stably transmitted to the laundry. At this time, when it is necessary to reduce the mechanical force acting on the laundry, the drum type washing machine 1 rotates the drum 30 and the pulsator 40 in opposite directions at the same number of revolutions per unit time, whereby the action of the pulsator 40 can lower

Here, in the drum type washing machine 1 according to the present embodiment, the following pattern of operation may be possible in addition to the above-described upper half washing during washing.

(Pattern 1) The drum washing machine 1 rotates the drum 30 and the pulsator 40 in the same direction at the same number of revolutions per unit time. The same operation as a conventional drum-type washing machine is performed.

(Pattern 2) The drum washing machine 1 rotates the drum 30 and the pulsator 40 in the same direction, and rotates the pulsator 40 at a higher number of revolutions per unit time than the drum 30 . The operation in which the convection effect by the pulsator 40 is given to the operation of the pattern 1 is performed.

(Pattern 3) The drum-type washing machine 1 stops energization to the motor 50 for driving the pulsator 40 and rotates the drum 30 without transmitting power to the pulsator 40 . Since all of the mechanical force necessary for pounding and sucking can be obtained from the drum 30, almost the same operation as that of a conventional drum type washing machine is performed. In this operation, since the power of the pulsator 40 is cut off, power consumption can be reduced while maintaining the cleaning power.

(Pattern 4) The drum type washing machine 1 rotates the drum 30 while the rotation of the pulsator 40 is stopped. The pulsator 40 is maintained in a stationary state (in the operation of the pattern 3, the pulsator 40 can rotate inertia). Since the pulsator 40 is stationary, the pulsator 40 is in a relatively inverted state with respect to the rotating drum 30 . Therefore, the effect of unwinding the laundry or the same effect as pounding the laundry with a small amount appears.

(Pattern 5) The drum-type washing machine 1 rotates the pulsator 40 in a state in which electricity is supplied to the motor 50 for driving the drum 30 and power is not transmitted to the drum 30 . Contrary to the operation of pattern 3, by filling the water tank 20 with sufficient water because the drum type washing machine 1 rotates the pulsator 40 in a state in which the drum 30 is capable of inertial rotation, water flows like a vertical washing machine. can be generated to perform "rubbing sucking". For example, if the laundry is sensitive clothing, this pattern 5 operation can reduce laundry damage or wrinkling.

(Pattern 6) The drum type washing machine 1 rotates the pulsator 40 in a state in which the rotation of the drum 30 is stopped. Unlike the operation of pattern 5 in which the drum 30 is capable of inertial rotation, the drum 30 is maintained in a stationary state.

However, in order to prevent laundry from sticking to the drum in a conventional drum-type washing machine that performs "tapping and sucking", in general, the number of revolutions per unit time of the drum is set to less than 50 rpm during washing. Therefore, the water stored in the water tank is stagnant, and it is difficult for water to continuously circulate inside the drum.

On the other hand, in the drum-type washing machine 1, the number of revolutions per unit time of the drum 30 is set higher than that of the conventional drum-type washing machine, so that water can continuously circulate in the drum 30 without a separate pump or the like. . That is, when washing in the drum type washing machine 1, water is ejected from the gap between the water tank 20 and the drum 30 in the front by rotating the drum 30 at a rotation speed of 50 rpm or more per unit time, and the drum 30 water flows into the inside of the Then, sufficient mechanical force and flow are applied to the laundry so that water can be circulated uniformly and continuously, so that the drum type washing machine 1 can secure high cleaning power, and the operating cost of the drum type washing machine 1 is increased. doesn't happen

Also, in the drum type washing machine 1 , by rotating the drum 30 at a number of revolutions per unit time of 50 rpm or more, water can be stirred and foamed in a narrow gap between the water tank 20 and the drum 30 . The foamed water is pumped up as described above and continuously circulated inside the drum 30 . As such, in the drum-type washing machine 1 , the foamed water can be continuously circulated even if no special equipment is installed.

Here, the water circulation or cleaning foam may be performed by rotation of the pulsator 40 instead of the drum 30 . In order to increase water circulation or foaming efficiency, a concave-convex structure or stirring blades may be provided on the drum 30 or the pulsator 40 .

In addition, in the drum type washing machine 1 , a protrusion-shaped baffle (lifter) may be provided on the inner circumferential surface of the drum 30 in order to efficiently lift the laundry and drop it from a high position according to the rotation of the drum 30 . Through this, the mechanical force by the stroking and sucking can be increased. Here, in the drum type washing machine 1, since the laundry can be made to stick to the inner circumferential surface of the drum 30 by centrifugal force, the amount of protrusion of the baffle can be reduced. Accordingly, the member cost is reduced, and the volume of the drum 30 can be enlarged.

<Operation Control>

When the controller 60 controls the motor 50 to rotate the pulsator 40 and the drum 30 in opposite directions to perform upper half washing, the controller 60 is washed by the laundry in the drum 30. It is possible to control the driving of the pulsator 40 according to the position in the vertical direction of the imbalance that occurs. Specifically, the controller 60, as shown in Figure 7, the unbalanced position detection unit 61 for detecting the vertical position of the unbalance in the drum 30, and the unbalanced position detection unit 61 detected by It includes a pulsator control unit 62 for controlling the driving of the pulsator 40 based on the vertical direction position of the unbalance. For example, when it is detected that the unbalance is located in the lower part of the drum 30 by the unbalance position detection unit 61, the pulsator control unit 62 detects that the unbalance is located in the upper part in the drum 30 In comparison with the case, the rotation speed of the pulsator 40 may be reduced, or the torque limit for the pulsator 40 may be reduced, or the speed control gain of the pulsator 40 may be reduced.

Here, the position of the unbalanced during washing means the central position of the laundry mass, and when the laundry is not bundled together, it means the central position of the main laundry mass. In addition, when the unbalance is located at the lowest point and the highest point in the drum 30, respectively, 0 ° and 180 °, for example, at least within the range of 0 ° ㅁ 45 ° is defined as the lower part in the drum 30, It can be defined as the upper part of the drum 30 within the range of at least 180 ° ㅁ 45 °.

Also, in the drum type washing machine 1 , the controller 60 (the unbalance position detecting unit 61 ) may detect the vertical position of the unbalance in the drum 30 based on the torque current of the drum 30 . For example, the unbalance position detection unit 61 determines that the unbalance is located at the highest point in the drum 30 when the torque current is the minimum during one rotation period of the drum 30, and the unbalance when the torque current becomes the maximum. It can be determined that is located at the lowest point of the drum (30). In addition, when the torque current of the drum 30 is greater than a predetermined value, the unbalance position detection unit 61 may determine that the unbalance is located in the lower portion of the drum 30 .

Here, the torque current of the drum 30 or the pulsator 40 means the envelope of the phase current (eg, one-phase current among three-phase current) applied to the drum 30 or the pulsator 40, and the torque The limit (torque limit) means an upper limit for the torque current.

8 is a view showing an example of driving control of the pulsator during washing by the drum type washing machine (1). At this time, FIG. 8 is a reference diagram schematically showing the drum 30 and the pulsator 40 viewed from the inlet 12 of the drum type washing machine 1 for ease of explanation. In this reference diagram, the positional relationship between the baffle 35 provided on the inner circumferential surface of the drum 30, the protrusion (wing) 45 of the pulsator 40, and the unbalance (C) is shown.

In the drive control shown in FIG. 8 , the unbalance position detecting unit 61 detects the vertical position of the unbalance C in the drum 30 based on the torque current (q-axis current) of the drum 30 . can Specifically, the unbalance position detection unit 61 determines that the unbalance (C) is located at the lowest point in the drum 30 when the torque current is maximum during one rotation period (T (seconds)) of the drum 30, and , when the torque current becomes the minimum, it is determined that the unbalance C is located at the highest point in the drum 30 . In addition, the unbalance position detection unit 61 when the torque current becomes the maximum, that is, when the unbalance (C) is located at the lowest point in the drum 30 as a center, before (T2 (seconds)), after that It is determined that the period of (T3 (seconds)), the unbalance (C) is located in the lower part of the drum 30, the pulsator control unit 62 is the rotation speed of the pulsator 40 of the period (T2, T3) ( V1) can be made smaller than the rotation speed V2 of the pulsator 40 in the other periods (T1, T4, T5) of the one rotation period (T). For example, T may be 1.2 seconds, T1 to T5 may be 0.06 seconds, 0.24 seconds, 0.24 seconds, 0.06 seconds, and 0.6 seconds, respectively, and V1 and V2 may be 80rpm and 160rpm, respectively. Here, the rotational speed of V1 and V2 may be set such that the rotational speed VD of the drum 30 is 50rpm (constant), whereas the average rotational speed VP of the pulsator 40 is 140rpm.

Here, when it is determined by the unbalance position detection unit 61 that the unbalance (C) is located in the lower part of the drum 30, the pulsator control unit 62 reduces the rotational speed of the pulsator 40 or pulsator It is also possible to reduce the torque limit for the eater 40 . For example, the pulsator control unit 62 may set the torque limit to 5A when the unbalance C is located in the lower part of the drum 30, and the torque limit to 10A in other cases. When the torque current of the pulsator 40 reaches the torque limit, the pulsator control unit 62 until the torque current becomes smaller than the torque limit, the rotational torque of the pulsator 40 is lowered of the pulsator 40 The supply of torque current may be stopped or the rotation of the pulsator 40 may be temporarily stopped.

In addition, when it is determined by the unbalance position detection unit 61 that the unbalance (C) is located in the lower part of the drum 30 , the pulsator control unit 62 decreases the rotation speed of the pulsator 40 or the pulsator The speed control gain of (40) can be made small. Accordingly, even if the rotation speed of the pulsator 40 is lower than a predetermined value, the torque current of the pulsator 40 does not rise, and the rotation torque of the pulsator 40 is lowered, so that the rotation of the pulsator 40 is once Sometimes it stops.

When the drum 30 and the pulsator 40 rotate in opposite directions, power consumption can be suppressed as the number of revolutions per unit time of the drum 30 increases when the laundry capacity is large, such as near the rated capacity. That is, if the rotation speed is slow, a high torque is required because the fluctuation in the deflection of the laundry inside the drum 30 increases, whereas if the rotation speed is fast, the laundry sticks more to the inner circumferential surface of the drum 30 and the deflection of the laundry is suppressed. This can reduce the required torque. On the other hand, when the capacity of the laundry is small and there is sufficient space inside the drum 30, if the number of revolutions per unit time of the drum 30 is too large, the centrifugal force increases and the laundry caught on the protrusion 45 of the pulsator 40 decrease in the amount of Accordingly, in this case, the drum type washing machine 1 may reduce the number of revolutions per unit time of the drum 30 .

In order to determine the weight of the laundry put into the drum 30 , the capacity of the laundry (or the remaining capacity of the drum 30 ), the type of laundry (cloth type), etc. before the washing operation, the controller 60 controls the weight plate It may include a government, a capacity determination unit, a gun breed determination unit, a driving condition determination unit, and the like. The weight determination unit determines the weight of the laundry put into the drum 30. For example, after the laundry is put into the drum 30, the drum 30 and the pulsator 40 are rotated in the same direction or in the opposite direction. The weight of the laundry can be sensed. The number of revolutions per unit time may be constant or may be changed. The capacity determination unit may rotate the drum 30 and the pulsator 40 again in the opposite direction to the weight determination in the rotation direction of the drum 30 and the pulsator 40 . In this way, the capacity determining unit may determine the ratio of the laundry capacity to the inner capacity of the drum 30 based on the difference from the weight detection. The cloth type determination unit supplies a predetermined amount of water to the inside of the water tank 20 and causes the water to be absorbed into the laundry put into the drum 30 for a predetermined time. The cloth type determination unit stores absorption data for each type of fabric, and at this time, the type of laundry can be determined based on the change in the water level inside the water tank 20 (the difference between the water level at the time of introduction and the water level after a predetermined time elapses) and the absorption data. can The water level detection is performed based on the water pressure inside the water tank 20 , and the water level at the time of water supply may be calculated based on the supplied quantity. The driving condition determining unit determines the rotation direction of each of the drum 30 and the pulsator 40 or the number of rotations per unit time based on at least one of the determination results of the various determination units. Such determination may be performed not only at the start of the washing cycle, but also during the washing cycle. Of course, judgment can also be made in the rinsing stroke.

In addition, the washing process is generally divided into each of "washing", "rinsing" and "drying". There may be a spin-drying cycle called intermediate spin-drying between the washing cycle and the rinsing cycle, or between successive rinsing cycles when there are two or more rinsing cycles. Torque is required to rotate the drum 30 or the pulsator 40, but the amount of torque required in the washing or rinsing cycle and the dehydration cycle is different. In general, a cycle requiring a large torque is a washing and rinsing cycle, and a large torque is not required for a spin-drying cycle. In addition, in the washing or rinsing cycle, the drum 30 and the pulsator 40 may rotate in opposite directions in the upper half cycle, but in the dehydration cycle, the drum 30 and the pulsator 40 rotate in the same direction. Therefore, the drum type washing machine 1 may stop energization to the motor 50 for driving the pulsator 40 during spin-drying, and the pulsator 40 may rotate only the drum 30 while inertial rotation. By doing so, the power consumption for rotating the pulsator 40 is eliminated, so that the power consumption can be suppressed. However, in this case, if the state of the laundry changes rapidly when the drum 30 and the pulsator 40 are rotating at different revolutions per unit time, there is a risk that the laundry may be damaged.

So, as a countermeasure, the magnetization rate of the motor 50 driving the drum 30 can be changed. In this way, even if the drum 30 and the pulsator 40 are rotated at the same time, power consumption can be suppressed. For example, in the drum type washing machine 1, after the laundry reaches a stable state (a state in which the drum 30 rotates at a rotation speed of about 50 rpm to 120 rpm per unit time) at the start of the spin-drying cycle or during the spin-drying cycle, the motor 50 ) by reducing the magnetization rate by performing demagnetization, it is possible to achieve a reduction in power consumption at high rotation.

<Effect of Example>

In the drum washing machine 1, when the drum 30 and the pulsator 40 are rotated in opposite directions to wash the upper half, the pulsator according to the vertical position of the imbalance caused by the laundry in the drum 30 It is possible to control the driving of the eater 40 . To this end, for example, when the unbalance is located in the lower part of the drum 30, the drum type washing machine 1 may increase the rotational speed of the pulsator 40 as compared to when the unbalance is located in the upper part in the drum 30. It can be made small or the torque limit for the pulsator 40 can be made small, or the speed control gain of the pulsator 40 can be made small. Thereby, the drum washing machine 1 can reduce the frequency in which laundry is caught between the baffle 35 of the drum 30 and the protrusions (wings) 45 of the pulsator 40. Accordingly, the drum-type washing machine 1 can reduce power consumption while maintaining high washing performance of washing the upper half. In addition, since the drum washing machine 1 adjusts the driving of the pulsator 40 with small inertia instead of the drum 30 with large inertia, an increase in power consumption due to this adjustment can be suppressed. Moreover, in the drum type washing machine 1, it becomes difficult to generate|occur|produce the above-mentioned pinching, and as a result, it can suppress that damage to laundry arises.

9 is a view showing an example of the drum-side phase current and the pulsator-side phase current during washing by the drum-type washing machine 1, and FIG. 10 is a pulsator according to the vertical position of the unbalance in the drum 30 in the drum-type washing machine 1 It is a diagram showing an example of the drum side phase current and the pulsator side phase current in the case of performing a washing operation without driving adjustment of the eater 40 (comparative example). Here, the phase current shown in FIG. 9 is a case where the driving control shown in FIG. 8 is performed, and the phase current shown in FIG. 10 is the rotation speed VP of the pulsator 40 in the driving control shown in FIG. 8 constant 140rpm in case it is changed to .

In comparison with the comparative example shown in FIG. 10, by performing the driving adjustment of the pulsator 40 according to the vertical position of the unbalance in the drum 30 in the drum type washing machine 1 of this embodiment, as shown in FIG. Similarly, the torque current (phase envelope of the phase current) of the pulsator 40, that is, the power consumption of the pulsator 40 is clearly reduced.

In addition, in the comparative example shown in FIG. 10, in the region A where the torque current of the pulsator 40 is maximized, the unbalance (C) is located in the lower part of the drum 30 as shown in FIG. 11A, so that the laundry is washed by gravity. Since it is easy to agglomerate, it is expected that the above-mentioned pinching occurs.

On the other hand, in the comparative example shown in FIG. 10, in the region B where the torque current of the pulsator 40 is minimized, the unbalance (C) is located at the upper end of the drum 30 as shown in FIG. It is expected that the above-mentioned pinching does not occur because it is easy to fall by the

Further, in the drum type washing machine 1 of the present embodiment, the controller 60 (unbalance position detecting unit 61 ) detects the vertical position of the unbalance in the drum 30 based on the torque current of the drum 30 . If it is, it is possible to easily detect the position in the vertical direction of the imbalance in the drum 30 . Here, the unbalance position detecting unit 61 determines that the unbalance is located at the highest point in the drum 30, for example, when the torque current becomes the minimum during one rotation period of the drum 30, and at the same time the torque current is the maximum. It can be determined that the unbalance is located at the lowest point of the drum 30 when it becomes, or when the torque current is greater than a predetermined value, it can be determined that the unbalance is located in the lower part of the drum 30 .

In addition, in the drum washing machine 1 of this embodiment, when the rotation speed of the pulsator 40 is greater than the rotation speed of the drum 30, the centrifugal force of the drum 30 and the mechanical force of the pulsator 40 are used. while "washing" can be performed. Through this, the drum-type washing machine 1 can obtain the effect of tapping the laundry with the protrusion 45 of the pulsator 40, the effect of rubbing the laundry with each other, and the effect of reducing laundry clumps due to laundry mixing.

The configuration of the drum-type washing machine is basically the same as that of the drum-type washing machine 1 of the embodiment shown in FIGS. 1 to 6 , except for the control contents by the controller (control device) 60 which will be described later.

However, at the time of washing the upper half, the speed control gain of the pulsator can be set high to avoid out-of-tidal when a large load is applied to the pulsator rapidly. Here, the speed control gain of the pulsator is the target speed when controlling the rotation speed per unit time of the pulsator drive motor so that the rotation speed (revolutions per unit time) of the pulsator matches the target speed (target rotation speed) It refers to the control parameters that adjust the followability.

12 is a diagram showing the relationship between the magnitude of the speed control gain of the pulsator and the time change of the rotation speed of the pulsator.

As shown in Fig. 12, when the speed control gain is high, the response is fast, but overshoot occurs or the response becomes vibrational. Therefore, followability to a sudden load change can be secured, but since it overreacts even to a slight load change, unnecessary operation of the pulsator increases and power consumption may increase.

On the other hand, as shown in FIG. 12 , when the speed control gain is low, although the responsiveness is slow, it is possible to smoothly follow the target speed. In other words, when the speed control gain is low, it is easy to step out due to poor followability to a sudden load change, but unnecessary operation of the pulsator is suppressed, thereby reducing the power possessed.

As described above, when the speed control gain of the pulsator is set high in order to avoid step-out at the time of a large load at the time of washing the upper half, the load applied to the pulsator is relatively small during normal operation, etc. when the amount of unbalance is small. The current consumption of the pulsator may increase due to unnecessary operation caused by the gain being too high.

Therefore, in the operation control of the drum type washing machine 1, the controller 60 controls the motor 50 to perform the upper half washing in which the pulsator 40 and the drum 30 are rotated in opposite directions, the controller (60) may control the driving of the pulsator 40 according to the amount of unbalance generated by the laundry in the drum (30). Specifically, as shown in FIG. 13 , the controller 60 determines the unbalance amount detection unit 63 for detecting the amount of unbalance in the drum 30 and the vertical position of the unbalance in the drum 30 . The driving of the pulsator 40 based on the unbalance position detection unit 61 to detect, the vertical position of the unbalance detected by the unbalanced position detection unit 61 and the amount of the unbalance detected by the unbalance amount detection unit 63 It includes a pulsator control unit 62 to control.

Here, the amount of unbalance at the time of washing means the degree of agglomeration of laundry in the drum 30 . In the case where the laundry seems to be bundled together in the drum 30 , the amount of unbalance is relatively large, and when it seems that the laundry is relatively scattered in the drum 30 , the amount of unbalance is relatively small. In addition, when the amount of unbalance in the drum 30 increases, the amplitude of the torque current of the drum 30 also increases. Conversely, when the amount of unbalance in the drum 30 decreases, the amplitude of the torque current of the drum 30 also increases. gets smaller Thus, for example, the amount of unbalance can be quantified based on the amplitude of the torque current of the drum 30 .

14 is a flowchart showing an example of driving control of the pulsator 40 at the time of washing the upper half by the controller 60 according to the present modification.

As shown in FIG. 14, when the upper half cleaning starts, in step S1, the pulsator control unit 62 sets the speed control gain of the pulsator 40 to an initial value (first gain value).

Next, in step S2, the amount of unbalance in the drum 30 is detected by the unbalance amount detection unit 63, and the pulsator control unit 62 determines whether the detected amount of unbalance is equal to or greater than a predetermined value. . Here, the unbalance amount detecting unit 63 may detect the amount of unbalance in the drum 30 based on the amplitude of the torque current of the drum 30 . Specifically, the unbalance amount detection unit 63 measures the amplitude of the torque current during one rotation period of the drum 30 as an index of the unbalance amount every period, and the pulsator control unit 62 determines whether the detected unbalance amount is greater than or equal to a predetermined value. It is also possible to determine whether Here, the predetermined value of the unbalance amount may be arbitrarily set according to the target power consumption or washing time, the amount or type of laundry, and the like.

If it is determined in step S2 that the amount of unbalance is less than the predetermined value, it returns to step S1 and the pulsator control unit 62 maintains the speed control gain of the pulsator 40 and maintains the first gain value. On the other hand, if it is determined in step S2 that the amount of unbalance is greater than or equal to a predetermined value, in step S3, the pulsator control unit 62 sets the speed control gain of the pulsator 40 to a second gain value greater than the first gain value. do. Through this, the followability to the target value of the rotation speed of the pulsator 40 for load fluctuations due to unbalance can be improved.

In addition, when it is determined in step S2 that the amount of unbalance is greater than or equal to a predetermined value, in step S4 , the pulsator control unit 62 performs driving adjustment of the pulsator 40 according to the position in the vertical direction of the unbalance. For example, when it is detected that the unbalance is located in the lower part of the drum 30 by the unbalance position detection unit 61, the pulsator control unit 62 detects that the unbalance is located in the upper part in the drum 30 In comparison, to reduce the rotation speed of the pulsator 40, or to reduce the torque limit for the pulsator 40, or to reduce the speed control gain of the pulsator 40.

After that, returning to step S2, the pulsator control unit 62 repeatedly performs the driving control of the pulsator 40. That is, when it is determined that the amount of unbalance is less than the predetermined value, the process returns to step S1 and the pulsator control unit 62 sets the speed control gain of the pulsator 40 to the first gain value, and the amount of unbalance is equal to or greater than the predetermined value. If it is determined that, in step S3, the pulsator control unit 62 sets the speed control gain of the pulsator 40 to the second gain value.

15A and 15B are diagrams illustrating examples of the drum side phase current and the pulsator side phase current when the unbalanced amount is small and large during washing with the drum type washing machine 1 according to the modified example, respectively. At this time, FIGS. 15A and 15B respectively show the drum-side phase current and the pulsator-side phase current during one revolution of the drum 30 .

15A and 15B, when the unbalance in the drum 30 is relatively small, the amplitude (UB amount) of the torque current (the upper envelope of the phase current) of the drum 30 is relatively small, When the unbalance in the drum 30 is relatively large, the amplitude of the torque current of the drum 30 is relatively large.

When the unbalance is relatively small as shown in FIG. 15A (when the unbalance is less than a predetermined value), the drum washing machine 1 sets the speed control gain of the pulsator 40 to a relatively small first gain value. Therefore, since overshoot or oscillatory response at the rotational speed of the pulsator 40 is suppressed, the amplitude of the pulsator 40 torque current (upper envelope of the phase current) is also suppressed relatively small as shown in Fig. 15A. .

On the other hand, when the imbalance as shown in FIG. 15B is relatively large (when the imbalance is greater than or equal to a predetermined value), the drum washing machine 1 sets the speed control gain of the pulsator 40 to a relatively large second gain value. . Therefore, since overshoot or a vibratory response to the rotational speed of the pulsator 40 is likely to occur, the amplitude of the torque current of the pulsator 40 is also relatively large, as shown in FIG. 15B .

As described above, when washing the upper half by rotating the drum 30 and the pulsator 40 in opposite directions, the controller 60 adjusts the amount of unbalance generated by the laundry in the drum 30 to The driving of the pulsator 40 can be adjusted accordingly. Therefore, for example, with respect to the speed control gain of the pulsator 40, the drum washing machine 1 sets a small gain value (first gain value) when the amount of unbalance is less than a predetermined value, and the amount of unbalance is predetermined When the value is greater than or equal to the value, it can be set to a large gain value (second gain value). Thereby, the drum type washing machine 1 has a small amount of unbalance, and when the load applied to the pulsator 40 is relatively small, the speed control gain is too high, and unnecessary operation of the pulsator 40 can be suppressed. Accordingly, the drum-type washing machine 1 can reduce power consumption while maintaining high washing performance of washing the upper half.

In addition, when the amount of unbalance is greater than or equal to a predetermined value, the drum washing machine 1 controls the driving of the pulsator 40 according to the vertical position of the unbalance through the controller 60 as in the above embodiment while adjusting the driving of the drum 30. By reducing the frequency of laundry being caught between the baffle and the wings of the pulsator 40, power consumption can be further reduced.

In addition, by detecting the amount of unbalance in the drum 30 based on the amplitude of the torque current of the drum 30 by the controller 60 , the drum washing machine 1 controls the amount of unbalance in the drum 30 . can be easily detected.

Here, when it is determined in step S2 that the amount of unbalance is equal to or greater than a predetermined value, in step S4 , the drum washing machine 1 performs drive adjustment of the pulsator 40 according to the vertical position of the unbalance. However, for example, when the amount of laundry to be washed in the upper half is large enough to the rated capacity, in order to avoid locking the pulsator 40, when the rotation speed of the pulsator 40 is reduced, the drum type washing machine 1 is unbalanced. Adjustment of only the speed control gain according to, may not perform the adjustment of the rotation speed of the pulsator 40 according to the vertical direction position of the unbalance. Alternatively, even when the amount of laundry to be washed in the upper half is small and it is difficult for laundry to be caught between the baffle of the drum 30 and the wings of the pulsator 40, the drum type washing machine 1 only adjusts the speed control gain according to the amount of unbalance. and may not perform adjustment of the driving control of the pulsator 40 according to the vertical position of the unbalance. In this case, the controller 60 (see FIG. 13 ) may not include the unbalanced position detection unit 61 , and the pulsator control unit 62 pulsates based only on the amount of unbalance detected by the unbalance amount detection unit 63 . It is also possible to control the driving of the eater 40 .

As described above, when washing the upper half by rotating the drum 30 and the pulsator 40 in opposite directions, the drum type washing machine 1 is in an unbalanced state caused by laundry in the drum 30. Adjust the driving of the pulsator 40 accordingly. Therefore, the drum type washing machine 1, the rotation speed of the pulsator 40, the torque limit for the pulsator 40, the speed control gain of the pulsator 40, etc. according to the vertical position of the unbalance or the amount of the unbalance, etc. By adjusting, it is possible to suppress unnecessary operation of the pulsator 40 caused by the case where laundry is caught between the baffle of the drum 30 and the blades of the pulsator 40 or the speed control gain is too high. Accordingly, the drum-type washing machine 1 can reduce power consumption while maintaining high washing performance of washing the upper half. In addition, since the drum washing machine 1 adjusts the driving of the pulsator 40 with small inertia instead of the drum 30 with high inertia, it is possible to suppress an increase in power consumption due to this adjustment.

In the above embodiment, although the rotational axis of the drum 30 extends in an approximately horizontal direction, the present invention is not limited thereto (with the opening of the drum 30 facing up), and the rotational axis of the drum 30 is inclined with respect to the vertical direction. The disclosed invention is also applicable. In particular, when the rotating shaft of the drum 30 is inclined at least 45° with respect to the vertical direction, the effect of the disclosed invention can be significantly exhibited.

Further, in the above embodiment, the drum type washing machine 1 detects the vertical position or amount of the unbalance in the drum 30 based on the torque current of the drum 30, but instead, there is another method, for example, a dedicated It is also possible to detect an unbalanced vertical position using a position detection sensor or the like. Alternatively, the drum type washing machine 1 may detect the vertical position or amount of unbalance in the drum 30 by mounting a vibration sensor or a speed (rotational speed) sensor on the drum 30 . In this case, when a lump of laundry falls from the top to the bottom in the drum 30, the value measured by the vibration sensor becomes the maximum, and the value measured by the speed sensor becomes the minimum. Accordingly, the drum washing machine 1 can detect the vertical position of the unbalance from the change in the sensor measurement value, and detect the amount of the imbalance from the maximum or minimum value of the sensor measurement value.

In addition, in the above embodiment, the drum type washing machine 1 is a state of unbalance, and the driving of the pulsator 40 is adjusted based on the position or amount in the vertical direction of the unbalance. However, instead or in addition to this, the drum-type washing machine 1 may adjust the driving of the pulsator 40 based on another state of unbalance, for example, the vertical speed of the unbalance or the rate of change of the amount of the unbalance.

As described above, the causes of the increase in power consumption when washing the upper half by the conventional drum-type washing machine are as follows. When washing the upper half, laundry rotating by the baffle of the drum may be caught in the protrusion (wing) of the pulsator, thereby increasing the current consumption of the pulsator. In addition, when the unbalance caused by the laundry is located at the upper part of the drum, the laundry tends to fall due to gravity, so it is difficult to cause the above-mentioned jamming, whereas when the imbalance is located at the lower part of the drum, the laundry is easily agglomerated by gravity Therefore, the above-mentioned pinching is easy to occur. In addition, at the time of washing the upper half, the speed control gain of the pulsator is set high to avoid out-of-tidal when a large load is applied to the pulsator rapidly. However, in normal operation where the amount of unbalance is small, the load applied to the pulsator is relatively small, so the current consumption of the pulsator may increase due to unnecessary operation caused by the speed control gain of the pulsator being too high.

A drum-type washing machine according to the disclosed invention includes a housing having an inlet through which laundry enters and exits, a water tank installed inside the housing, a drum rotatably accommodated in the water tank in a state of being opened toward the inlet port, and rotatable at the bottom of the drum It includes a pulsator installed in a well-installed manner, a driving device for driving the drum and the pulsator, and a control device for controlling the driving device, wherein the rotating shaft of the drum is inclined with respect to the vertical direction, and the control device controls the driving device during washing. While rotating the pulsator and the drum in opposite directions, the driving of the pulsator is adjusted according to the state of unbalance caused by laundry in the drum.

According to the drum-type washing machine according to the disclosed invention, the driving of the pulsator is adjusted according to the state of unbalance caused by laundry in the drum during washing by rotating the drum and the pulsator in opposite directions. Therefore, by adjusting the rotation speed of the pulsator, the torque limit for the pulsator, the pulsator speed control gain, etc. according to the vertical position of the unbalance or the amount of the unbalance, when laundry is caught between the baffle of the drum and the blade of the pulsator However, unnecessary operation of the pulsator caused by the speed control gain being too high can be suppressed. Therefore, power consumption can be reduced while maintaining high cleaning performance of upper half cleaning. In addition, since the driving of the pulsator with small inertia is adjusted instead of the drum with large inertia, an increase in power consumption due to this adjustment can be suppressed.

In the drum type washing machine according to the present embodiment, the unbalanced state may be a vertical position of the unbalanced. That is, the driving of the pulsator may be adjusted according to the vertical position of the unbalance generated by the laundry in the drum during upper half washing by rotating the drum and the pulsator in opposite directions. In this way, for example, unbalance When is located in the lower part of the drum, compared to when the unbalance is located in the upper part of the drum, the rotation speed of the pulsator is reduced, the torque limit for the pulsator is reduced, or the speed control gain of the pulsator is reduced. It can reduce the frequency of laundry getting caught between the baffle and the pulsator's wings. Therefore, power consumption can be reduced while maintaining high cleaning performance of upper half cleaning. In addition, it is possible to suppress the occurrence of the above-described pinching less easily, resulting in damage to the laundry.

At this time, according to the present embodiment, the position of the unbalanced during washing means the central position of the laundry mass, and when the laundry is not bundled together, it means the central position of the main mass of laundry. In addition, when the unbalance is located at the lowest point and the highest point in the drum, respectively, 0 ° and 180 °, for example, at least within the range of 0 ° ㅁ 45 ° is called the lower part of the drum, and at least 180 ° ㅁ 45 ° The inner part can be called the upper part of the drum.

Also, in the drum washing machine according to the present embodiment, the control device may detect the vertical position of the unbalance in the drum based on the torque current of the drum. This makes it easy to detect the vertical position of the unbalance within the drum. For example, the control device may determine that the unbalance is located at the highest point in the drum when the torque current becomes the minimum during one rotation period of the drum, and at the same time determine that the unbalance is located at the lowest point of the drum when the torque current becomes the maximum. have. Also, when the torque current becomes larger than a predetermined value, the control device can determine that the unbalance is located in the lower part of the drum.

In addition, according to the present embodiment, the torque current of the drum or the pulsator means the upper envelope of the phase current applied to the drum or the pulsator, and the torque limit means the upper limit of the torque current.

In addition, in the drum type washing machine according to the present embodiment, the unbalanced state may be the amount of unbalance. That is, the driving of the pulsator may be adjusted according to the amount of unbalance generated by laundry in the drum during upper half washing by rotating the drum and the pulsator in opposite directions. In this way, for example, with respect to the speed control gain of the pulsator, when the amount of unbalance is less than a predetermined value, it is set to a small gain value, and when the amount of unbalance is more than a predetermined value, it is set to a large gain value. When this small load applied to the pulsator is relatively small, it is possible to suppress the occurrence of unnecessary operation in the pulsator because the speed control gain is too high. Therefore, it is possible to reduce power consumption while maintaining the high cleaning performance of the upper half cleaning.

In addition, when the amount of unbalance is greater than or equal to a predetermined value, after setting it to a large gain value, as described above, the driving of the pulsator may be adjusted according to the position of the unbalance in the vertical direction. In this way, it is possible to further reduce power consumption by reducing the frequency of laundry being caught between the baffle of the drum and the blades of the pulsator.

Here, in the present application, the amount of unbalance at the time of washing means the degree of agglomeration of laundry in the drum, and when it seems that the laundry is bundled together in the drum, the amount of unbalance is relatively large, and the laundry is relatively scattered in the drum. In this case, the amount of unbalance is relatively small. In addition, as the amount of unbalance in the drum increases, the amplitude of the torque current of the drum increases accordingly. Conversely, when the amount of unbalance in the drum decreases, the amplitude of the torque current of the drum decreases accordingly. For example, the amplitude of the torque current of the drum Accordingly, the amount of unbalance can be quantified.

That is, in the drum type washing machine according to the present embodiment, the control device may detect the amount of unbalance in the drum based on the amplitude of the torque current of the drum. This makes it easy to detect the amount of unbalance in the drum.

In addition, in the drum type washing machine according to the present embodiment, if the rotating shaft of the drum is inclined by 45° or more with respect to the vertical direction, the effects of the disclosed invention can be remarkably obtained.

The disclosed embodiments have been described with reference to the accompanying drawings as described above. Those of ordinary skill in the art to which the published embodiment pertains will understand that the disclosed embodiment may be implemented in a form different from the disclosed embodiment without changing the technical spirit or essential features of the published embodiment. The disclosed embodiments are illustrative and should not be construed as limiting.

1 drum washing machine
10 housing
12 inlet
20 tank
30 drums (rotating tank)
40 Pulsator (agitator)
50 motor (drive unit)
60 controller (control unit)
70 double shaft
J axis of rotation

Claims (20)

water tank;
a drum rotatably provided in the water tank;
a pulsator rotatably provided in the drum;
a driving unit for driving the drum and the pulsator; and
A control unit for controlling the driving unit to rotate the pulsator in a second direction while rotating the drum in the first direction,
The control unit is
A washing machine for controlling the driving unit to drive the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. According to claim 1, wherein the control unit,
A washing machine for controlling the driving unit to change the rotation speed of the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. According to claim 2, wherein the control unit,
Controlling the driving unit to rotate the pulsator at a first speed based on the laundry being positioned below the first reference position during rotation of the drum,
Washing machine for controlling the driving unit to rotate the pulsator at a second speed greater than the first speed based on the laundry being positioned above a second reference position higher than the first reference position during rotation of the drum . According to claim 2, wherein the control unit,
Controlling the driving unit to rotate the pulsator at a first speed based on the laundry being positioned at the bottom of the drum during rotation of the drum,
A washing machine for controlling the driving unit to rotate the pulsator at a second speed greater than the first speed based on the laundry being positioned at a high point of the drum during rotation of the drum. According to claim 1, wherein the control unit,
A washing machine for controlling the driving unit to change a torque limit of the driving unit for rotating the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. According to claim 1, wherein the control unit,
A washing machine for controlling the driving unit to change the rotation speed of the pulsator based on a driving current of the driving unit for rotating the drum. The method of claim 6, wherein the control unit,
controlling the driving unit to rotate the pulsator at a first speed based on that the driving current is greater than a first reference current during one rotation period of the drum;
A washing machine for controlling the driving unit to rotate the pulsator at a second speed greater than the first speed based on the drive current being smaller than a second reference current smaller than the first reference current during one rotation period of the drum. The method of claim 6, wherein the control unit,
Controlling the driving unit to rotate the pulsator at a first speed based on the maximum value of the driving current during one rotation period of the drum,
A washing machine for controlling the driving unit to rotate the pulsator at a second speed greater than the first speed based on the minimum value of the driving current during one rotation period of the drum. According to claim 1, wherein the control unit,
A washing machine for controlling the driving unit to change a torque millimeter of the driving unit for rotating the pulsator based on a driving current of the driving unit for rotating the drum. According to claim 1,
In the washing stroke or rinsing of the washing machine, the first direction is different from the second direction,
In the spin-drying cycle of the washing machine, the first direction is the same as the second direction. In the control method of a washing machine comprising a water tank, a drum rotatably provided in the water tank, and a pulsator provided rotatably in the drum,
rotating the pulsator in a second direction while rotating the drum in a first direction;
Control method of a washing machine comprising varying the rotation of the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. According to claim 11, Varying the rotation of the pulsator,
Control method of a washing machine comprising changing the rotation speed of the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. The method of claim 12, wherein changing the rotation speed of the pulsator comprises:
rotating the pulsator at a first speed based on the laundry being positioned below the first reference position during rotation of the drum;
A control method of a washing machine comprising rotating the pulsator at a second speed greater than the first speed based on the fact that the laundry is positioned above a second reference position higher than the first reference position during rotation of the drum . The method of claim 12, wherein changing the rotation speed of the pulsator comprises:
rotating the pulsator at a first speed based on the laundry being positioned at a low point of the drum during rotation of the drum;
The control method of a washing machine comprising rotating the pulsator at a second speed greater than the first speed based on the laundry being positioned at a high point of the drum during rotation of the drum. According to claim 11, Varying the rotation of the pulsator,
A control method of a washing machine comprising changing a torque limit for rotating the pulsator based on the position of the laundry accommodated in the drum during rotation of the drum. According to claim 11, Varying the rotation of the pulsator,
A control method of a washing machine comprising changing a rotation speed of the pulsator based on a driving current for rotating the drum. The method of claim 16, wherein changing the rotational speed of the pulsator comprises:
rotating the pulsator at a first speed based on the drive current being greater than a first reference current during one rotation period of the drum;
The method of controlling a washing machine comprising rotating the pulsator at a second speed greater than the first speed based on the driving current being smaller than a second reference current smaller than the first reference current during one rotation period of the drum. The method of claim 16, wherein changing the rotational speed of the pulsator comprises:
rotating the pulsator at a first speed, based on the maximum value of the driving current during one rotation period of the drum;
Based on the minimum value of the driving current during one rotation period of the drum, the control method of the washing machine comprising rotating the pulsator at a second speed greater than the first speed. According to claim 11, Varying the rotation of the pulsator,
Based on a driving current for rotating the drum, the control method of a washing machine comprising changing a torque millimeter for rotating the pulsator. 12. The method of claim 11,
In the washing stroke or rinsing of the washing machine, the first direction is different from the second direction,
In the spin-drying cycle of the washing machine, the first direction is the same as the second direction.

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