KR20130091590A - Washing machine and controlling method of the same - Google Patents

Abstract

PURPOSE: A washing machine and a method for detecting the laundry amount of the washing machine are provided to diversely circulate laundry in consideration of torque distribution affected by the operation of two drums, mechanical power applied to the laundry, and the movement of the laundry, thereby improving washing efficiency. CONSTITUTION: A washing machine includes a main drum, a sub drum, a driving motor (70), and a control unit (100). The main drum is installed inside the tub and accommodates laundry. The sub drum is installed inside the main drum to be reversely rotated against the main drum. The driving motor is connected to the stator, the sub drum, an outer rotor (72) circulating outside the stator, and an inner rotor (73) which is connected to the main drum and circulates inside the stator. The control unit drives the inner and outer rotors respectively to reach a predetermined rotary speed and generates a brake command for the inner and outer rotors. The control unit detects a first laundry amount and a second laundry amount of the main and sub drums based on the delay time of the inner and outer rotors before stopping. [Reference numerals] (100) Control unit; (200) Current sensing unit; (300) Output unit; (400) Storage unit; (500) Input unit; (72) Outer rotor; (73) Inner rotor

Description

Washing machine and its detection method {WASHING MACHINE AND CONTROLLING METHOD OF THE SAME}

The present invention relates to a washing machine for generating a three-dimensional flow so that both the circumferential direction and the axial flow of the laundry object inside the drum, and a quantity detection method thereof.

In general, a washing machine forcibly flows a laundry object in a drum by using a mechanical force such as a friction force of a rotating drum and a laundry object by receiving the driving force of the driving motor while the detergent, the washing water, and the laundry object are put in the drum. Let's do it. Accordingly, the object to be washed is subjected to physical action such as friction or impact to wash. In addition, the laundry object is washed by a chemical action generated by the detergent in contact with the laundry object. Furthermore, the chemical action of the detergent is facilitated by the flow inside the drum of the laundry object.

Recently used drum washing machine has a rotating shaft of the drum is formed in the horizontal direction. Of course, there is also a drum washing machine formed so that the rotation axis of the drum is a predetermined angle with respect to the horizontal direction. The drum washing machine having a horizontal axis of rotation allows the laundry object to flow in the circumferential direction along the inner circumferential surface of the drum.

The object to be washed flows along the drum inner circumferential surface by the centrifugal force caused by the rotation of the drum and friction with the drum inner circumferential surface. A lifter may be provided on the drum inner circumferential surface to assist the flow of the laundry object. Here, depending on the rotational speed of the drum, the object to be washed may be circular motion along the inner circumferential surface, or may be dropped by gravity at the top of the drum. This drop motion is a factor that greatly affects the washing effect.

The flow inside the drum of the laundry object greatly affects the washing effect. In detail, the various flows of the washing object may vary the contact surface of the washing object rubbed on the drum inner circumferential surface to allow even washing. In addition, the various flows of the laundry object increase the physical force acting on the laundry object to increase the washing effect.

In the case of a typical drum washing machine, a single drum rotates and the laundry object flows. Accordingly, the object to be washed is made only in the circumferential direction of the drum along the drum inner circumferential surface at the initial position, and complex flows such as axial flow and rotational flow are difficult to achieve. That is, the washing object is made of only a flat flow. This is because there is no room for a separate external force to generate a complex flow of laundry objects. Accordingly, the flow of the object to be washed is limited and the washing effect is inevitably limited, further increasing the washing time and power consumption.

In general, the washing machine detects a quantity of water at the beginning of the washing cycle, and automatically sets the water level, washing time, washing pattern, dehydration time, and other conditions necessary for the operation of the washing machine according to the result.

If the amount of detection is not made correctly, problems such as increased use quantity, reduced washing performance, increased damage, and detergent residues are required.

Embodiments of the present invention have an object to provide a washing machine having a structure that allows the laundry object to flow in various forms within the drum of the washing machine.

Embodiments of the present invention have an object of providing a washing machine having two drums and a drive motor capable of driving them independently to allow a washing object to be flowed in three dimensions.

Embodiments of the present invention have a purpose to provide a washing machine and a washing machine detection method capable of accurately detecting the quantity of the washing machine having two drums and a drive motor capable of driving them independently.

A washing machine according to an embodiment includes a main body forming an exterior, a tub provided inside the main body, a main drum rotatably mounted inside the tub to accommodate laundry objects therein, and a relative rotation with the main drum. A sub drum mounted inside the main drum, a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator. It comprises a drive motor, and a control unit for driving the inner rotor and the outer rotor. Here, the control unit drives the inner rotor and the outer rotor to reach a constant rotational speed, generates a braking command to the inner rotor and the outer rotor, and a delay time until the stop of the inner rotor and the outer rotor. The first and second doses of the main drum and the sub drum are sensed based on the above.

In the washing machine according to another embodiment, a control unit is connected to the master control unit, the master control unit for driving the inner rotor, and detecting the first quantity based on the delay time of the inner rotor, the outer rotor And a slave controller configured to sense the second quantity based on a delay time of the outer rotor.

The master controller generates a braking command for the outer rotor and transmits the braking command to the slave controller, and then generates a braking command for the inner rotor after a predetermined time elapses.

The washing machine further includes a current detection unit that detects a first current and a second current flowing through the inner rotor and the outer rotor.

A quantity detection method of a washing machine according to an embodiment includes a main body forming an appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; And a drive motor including a stator, an outer rotor connected to the sub drum and rotating outside of the stator, and an inner rotor connected to the main drum and rotating inside of the stator. Driving the rotor and the outer rotor, respectively, when the inner rotor and the outer rotor reach a constant rotational speed, braking the inner rotor and the outer rotor, and a delay time until the stop of the inner rotor and the outer rotor. And detecting the first and second amounts of the main drum and the sub drum, respectively.

According to another embodiment, a quantity detection method of a washing machine includes: a main body forming an appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; A drive motor including a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator; A master controller for driving the inner rotor; And a slave controller for driving the outer rotor, wherein the master controller and the slave controller respectively drive the inner rotor and the outer rotor, and the inner rotor and the outer rotor reach a constant rotational speed. When the master control unit brakes the inner rotor and the outer rotor, and the master control unit and the slave control unit respectively delay the inner and outer rotors based on the delay time until the stop of the main drum and the sub drum, respectively. And detecting the first and second doses.

Embodiments of the present invention by using two independently driven drums to move the washing object moving in the drum of the washing machine in a three-dimensional, various flow. Embodiments of the present invention improves the washing performance of the washing machine by allowing the washing object to be flowable in three dimensions, and has the effect of reducing the washing time.

Embodiments of the present invention improve the washing performance by allowing the washing object to be three-dimensional flow in consideration of the torque distribution, the mechanical force acting on the washing object, and the fluidity of the washing object by driving two drums.

Embodiments of the present invention in the washing machine having two drums and a drive motor capable of driving them independently can accurately detect the amount of washing machine by detecting the quantity of each drum.

Embodiments of the present invention have the effect of improving the detection capacity of the washing machine more precisely by changing the quantity detection method for the quantity of the two drums, and to reduce the washing water and electrical capacity required for washing, rinsing and dehydration strokes. .

1 is a view schematically showing a washing machine according to an embodiment of the present invention;
Figure 2 is a schematic diagram showing the connection of the drive motor and the main drum and the sub drum in Figure 1;
3 is a block diagram schematically illustrating a configuration of a driving motor driving apparatus of a washing machine according to one embodiment;
4 is a view schematically showing the flow of the laundry object inside the washing machine;
FIG. 5 schematically shows the flow of laundry objects at point A of FIG. 4;
6 is a schematic view of a washing machine according to another embodiment of the present invention;
7 is a graph illustrating an operation of sensing a quantity of power by generating and braking an outer rotor and an inner rotor according to an exemplary embodiment of the present invention;
FIG. 8 is a graph showing a change in current flowing through the outer rotor and the inner rotor in FIG. 7; FIG.
9 is a graph illustrating an operation of sensing an amount of capacity by braking an outer rotor and generating and braking an inner rotor according to an embodiment of the present invention;
FIG. 10 is a graph showing changes in current flowing through the outer rotor and the inner rotor in FIG. 9; FIG.
11 is a block diagram schematically illustrating a configuration of a driving motor driving apparatus of a washing machine according to another embodiment; And
12 and 13 are flowcharts illustrating a method of detecting a quantity of washing machine according to embodiments of the present disclosure.

Referring to FIG. 3, a washing machine according to an embodiment includes a main body 10 forming an exterior, a tub 40 provided inside the main body 10, and rotatably mounted in the tub 40. And a main drum 50 for accommodating laundry objects therein, a sub drum 60 mounted inside the main drum 50 so as to be relatively rotatable with the main drum 50, and a stator 71 and the sub serve. An outer rotor 72 connected to the drum 60 and rotated outside the stator 71, and an inner rotor 73 connected to the main drum 50 and rotated inside the stator 71. And a control unit 100 for driving the outer rotor 72 and the inner rotor 73.

In the following, the rotational speed and the rotational speed are used interchangeably. This is because in other words, in the strict sense, in the present invention can be identified in the sense of rotating the drive motor of the same washing machine per unit time.

Referring to FIG. 1, the washing machine corresponds to a main body and includes a cabinet 10 constituting an external appearance of the apparatus. The front of the cabinet 10 is formed with an inlet 20 for injecting the clothes to be washed into the cabinet (10).

 The inlet 20 is opened and closed by a door rotatably fixed to the cabinet. On the upper side of the cabinet, a control panel 30 in which various operation buttons for operating a washing machine are disposed is located, and one side of the control panel 30 is provided with a detergent supply device (not shown) into which detergent can be put. .

In the receiving space formed inside the cabinet 10, a tub 40 having a cylindrical shape for storing wash water, and a main drum 50 and a sub drum 60 rotatably installed in the tub and into which a laundry object is put. ) Is provided. The rear part of the tub is provided with a drive motor 70 for driving the main drum and the sub drum.

The tub 40 has a cylindrical configuration and can accommodate the main drum 50 and the subdrum 60 therein. The front surface of the tub 40 is open to be connected to the open inlet 20 of the cabinet described above. Therefore, a gasket surrounding the front part of the tub and the inlet of the cabinet is provided between the front part of the tub and the inlet of the cabinet. This is a configuration for preventing the wash water accommodated inside the tub to flow into the cabinet.

The main drum 50 is a cylindrical configuration rotatably mounted inside the tub. The side of the main drum 50 may be formed with a plurality of through-holes through which the wash water can escape.

The sub drum 60 is a cylindrical configuration rotatably mounted inside the main drum 50. Here, the sub drum 60 is mounted to be relatively rotatable with the main drum. That is, since the main drum and the sub-drum can be driven independently of each other, various relative rotations are possible according to the rotational speed and the rotational direction of the respective drums.

The drive motor 70 is a device for generating a driving force for driving the main drum and the sub drum, and is mounted on the rear surface of the tub 40. The drive motor 70 includes a stator 71 that is fixed, an outer rotor 72 that rotates outside the stator, and an inner rotor that rotates inside the stator. It comprises 73. A drive motor having two rotors may be referred to as a dual-rotor motor for convenience.

The stator 71 has an annular structure to surround the inner rotor 73 and is coupled to be fixed to the tub side. The stator includes an inner winding portion and an outer winding portion on a core in which iron cores are stacked.

Referring to FIG. 2, the inner rotor 73 is rotatably provided inside the stator and is connected to an outer shaft 81 to be described later to participate in the rotation of the main drum 50. The outer rotor 72 is rotatably provided on the outside of the stator, and is connected to an inner shaft 82 to be described later to participate in the rotation of the sub drum 60. The inner rotor and the outer rotor have magnets, and when current is applied to the inner and outer windings of the driving motor, the inner rotor and the outer rotor rotate by a magnetic field generated by the flowing current.

The control unit 100 may control currents of the inner and outer windings of the driving motor 70, respectively. In this case, the inner rotor and the outer rotor rotate independently of each other. Accordingly, as shown in FIG. 2, the main drum 50 and the sub drum 60 may be independently rotated by one driving motor 70. That is, the driving motor drives the main drum and the sub drum independently. The side of the configuration, by driving the main drum and the sub-drum independently by the drive motor to cause the rotation of the laundry object by the difference in the relative rotation speed between the drum, the laundry object is rotated inside the drum and the three-dimensional flow This should happen.

The outer shaft 81 penetrates the tub 40 to connect the inner rotor 73 and the main drum 50. The outer shaft 81 corresponds to a hollow shaft, and the inner shaft 82 is mounted therein. The inner shaft 82 penetrates through the inside of the outer shaft to connect the outer rotor 72 and the sub drum 60.

The main drum 50 and the outer shaft 81 are connected by the main drum spider 91. The main drum 50 is open front and rear. The main drum spider 91 is coupled to the outer shaft 81 and fixed to the main drum 50.

The sub drum 60 and the inner shaft 82 are connected by the sub drum spider 95. The sub drum 60 has a sub drum bag forming a rear face, the front of which is open but the rear of which is closed by the sub drum bag. The sub drum spider 95 is fixed in close contact with the sub drum bag.

Referring again to FIG. 2, the outer shaft and the inner shaft have a structure rotatable independently of each other with a bearing therebetween, and the outer rotor and the inner rotor also have a structure rotatable independently of each other with a stator therebetween. The stator may include separate windings on the outer rotor side and the inner rotor side, and the driving motor may independently drive the outer rotor and the inner rotor. Since the main drum is driven by the inner rotor and the sub drum is driven by the outer rotor, the main drum and the sub drum may be driven independently by the driving motor. In addition, the main drum and the sub drum may be variously rotated by independent driving of the outer rotor and the inner rotor. That is, the rotation direction of the main dream and the sub drum may be different from each other, or different relative rotations, ie, three-dimensional flows, may be generated by giving different speeds to the same rotation direction.

On the other hand, the axial length of the inner circumferential surface of the main drum and the inner circumferential surface of the sub drum are different from each other, the outer circumferential surface of the sub drum is configured to face some of the inner circumferential surface of the main drum. The sub drum has a structure shorter in axial length than the main drum. Here, the sub drum is mounted inside the main drum to extend in an axial direction from one end of the main drum. Accordingly, the sub drum has an outer circumferential surface 60a facing the inner circumferential surface 50b of the main drum, but the main drum has only a part 50b of the inner circumferential surfaces 50a and 50b facing the outer circumferential surface 60a of the sub drum. It has a structure.

FIG. 4 shows only the first surface 50a of the main drum and the inner circumferential surface 60b of the sub-drum to which the laundry object can be contacted to show the flow of the laundry inside the drum. FIG. 5 shows an enlarged view of a boundary line A where the first surface 50a of the main drum and the inner circumferential surface 60b of the sub drum are divided.

The washing object is caused to flow in one direction by the rotational speed difference between the drums. In Fig. 4, the main drum is rotating counterclockwise, and the sub drum is rotating clockwise. In this case, the absolute value of the rotational speed of the sub drum may be larger than the absolute value of the rotational speed of the main drum. If the absolute values of the rotational speeds of the sub drum and the main drum are the same, the washing object only rotates in place at the boundary line A between the main drum and the sub drum. Therefore, for the three-dimensional flow of the laundry object, it is preferable to make a difference in the rotational speed of the drum, so that a large rotational force acts in one direction.

5 shows the flow of the laundry object near the boundary line A of the drums when the rotation speed of the sub drum is greater than the rotation speed of the main drum. At this time, the rotational flow of the laundry object is rotated in the clockwise direction B about the rotation axis Z in the vertical direction when viewed from the inner circumferential surface of the drum.

In addition, the laundry object undergoes a circumferential flow C of the drum by friction with the inner circumferential surface of the drum. Accordingly, the object to be washed is the circumferential flow of the drum and rotates about a rotation axis perpendicular to the inner circumferential surface of the drum, so that the axial flow (D) is generated from the drum 60 having a high rotational speed to the slow drum 50. do.

An axial flow D of the laundry object is generated by relative rotation between the main drum and the sub drum. More specifically, the inner circumferential surface of the main drum is divided into a first surface 50a that does not face the outer circumferential surface of the sub drum and a second surface 50b that faces the sub drum outer circumferential surface 60a. The object to be washed flows in the axial direction by a relative motion between the first surface 50a of the inner circumferential surface and the inner circumferential surface 60b of the sub drum.

From the point of view of the laundry object, the laundry object flows in the circumferential direction by the rotation of the main drum or the sub drum, but in the axial direction by the relative movement of the main drum and the sub drum. Here, the axial flow of the laundry object is made by the rotation of the laundry object by the relative movement of the main drum and the sub-drum. More specifically, the axial flow (D) is caused by the rotation of the laundry object about the axis of rotation (Z) perpendicular to the drum inner peripheral surface of the laundry object. As a result, the washing object has an axial flow D of the drum in addition to the circumferential flow C of the planar drum, thereby enabling a three-dimensional flow.

Arrows in the drum in Figure 4 schematically shows the flow of the laundry object to be such a three-dimensional flow. Referring to Figure 4, the laundry object shows a belt-like flow twisted roughly. This is a type of flow that occurs because the washing object rotates and at the same time shows the circumferential flow and the flow falling by gravity.

The washing machine shown in FIG. 1 has a structure in which a rotating shaft of a drum is arranged in a horizontal direction. However, the present invention is not limited thereto, and the drum may be tilted to have a predetermined angle with respect to the horizontal direction. 6 shows a washing machine having such a structure in which the rotating shaft is inclined. In this case, there is an advantage that the flow of the laundry object by the rotation of the main drum and the sub drum is more diversified. That is, when the laundry object flowing in the circumferential direction along the inner circumferential surface along the rotation of the main drum or sub drum falls by gravity at the top of the drum, it falls to a position different from the flow path of the conventional laundry object in the circumferential direction Since it is possible to perform the axial flow by gravity, it becomes possible to flow the laundry object more efficiently.

The aspect of the configuration as described above, by driving the main drum and the sub-drum independently by the drive motor to cause the rotation of the laundry object by the relative rotational speed difference between the drum, the laundry object rotates inside the drum And three-dimensional flow occurs.

In addition, the sub drum is shorter in the axial length than the main drum, so that the laundry object can be in contact with the interface between the sub drum and the main drum. Accordingly, the object to be washed is rotated due to the rotational speed difference between the drums to be a three-dimensional flow is possible. This allows three-dimensional flow to the laundry object to improve the washing performance of the washing machine, and has the effect of reducing the washing time.

On the other hand, the inner peripheral surface of the main drum may be provided with a drum guide (not shown) for sealing between the outer peripheral surface of the sub-drum. This is to prevent the laundry object from being pinched between the drums.

1, a plurality of main drum lifters 51 protruding radially inwardly are provided on an inner circumferential surface of the main drum, and a plurality of protruding radially inwards are provided on an inner circumferential surface of the sub drum. A sub drum lifter 61 is provided to assist the flow of the laundry object in the drum.

The control unit 100 may be provided inside the control panel 30 or may be installed in a separate container at one side of the washing machine. The control unit 100 generally has the form of one or more PCBs.

In the washing machine according to an embodiment, the control unit 100 drives the inner rotor 73 and the outer rotor 72 to reach a predetermined rotational speed, respectively, and the inner rotor 73 and the outer rotor Generate a braking command at 72. Then, the control unit 100 detects the first and second doses of the main drum 50 and the sub drum 60 based on the delay time until the stop of the inner rotor and the outer rotor, respectively. Here, the constant rotational speed may be set to the inner rotor and the outer rotor, respectively, but may be set to one rotational speed, for example, 150 RPM, 160 RPM. In addition, although the first and second doses are detected based on the delay time, the first and second doses may be detected by counting the number of pulses according to rotation.

In addition, the control unit 100 can brake the outer rotor and the inner rotor in different manners or in the same manner. That is, the control unit 100 may generate and brake both the outer rotor and the inner rotor, or the braking of both, or the braking of the other and the braking of the other. The description of the configuration necessary for braking power generation and braking power, for example, resistance and circuit connection, will be omitted.

The washing machine further includes a current detection unit 200 that detects a first current and a second current flowing through the inner rotor and the outer rotor. The washing machine further includes an output unit 300 for displaying a value of one of the first amount, the second amount, and the final amount determined based on the first amount and the second amount. .

In addition, the washing machine further includes a storage unit 400 that stores a driving program for driving the washing machine, information according to an administration such as washing, drying, and dehydration. The washing machine further includes an input unit 500 including various operation buttons disposed on the control panel 30 for operating the washing machine. The output unit 300 can display time, temperature, state, error, and the like.

FIG. 7 is a graph showing a change in the rotation speed (RPM) of each rotor when both the outer rotor 72 and the inner rotor 73 are generated and braked. 8 is a graph showing the current flowing through the inner rotor and the outer rotor in the case of FIG. 7.

Referring to FIG. 7, the control unit 100 starts the inner rotor and the outer rotor, respectively, and increases the rotation speed to 160 RPM, which is a predetermined rotation speed. Then, the control unit 100 generates braking commands for the inner rotor and the outer rotor and outputs them to each rotor. At this time, the braking command for the inner rotor 73 and the outer rotor 72 may be output to the rotors at the same time. This is to minimize the change in the amount of braking due to braking. In the case of generating and braking both the inner rotor and the outer rotor, as shown in FIG. 7, the outer rotor RPM2 is generally braked before the inner rotor RPM1. Referring to FIG. 8, the current I1 flowing in the inner rotor 73 is greater than the current I2 flowing in the outer rotor 72, and the delay time until the stop according to the braking command is also delayed ( It can be seen that T1) is longer than the delay time T2 of the outer rotor.

FIG. 9 is a graph showing a change in rotational speed (RPM) of each rotor when the outer rotor 72 is braked by the force and the inner rotor 73 is braked by power generation. 10 is a graph showing the current flowing through the inner rotor and the outer rotor in the case of FIG. 9.

Referring to FIG. 9, the control unit 100 starts the inner rotor and the outer rotor, respectively, and increases the rotation speed to 160 RPM, which is a predetermined rotation speed. Then, the control unit 100 generates braking commands for the inner rotor and the outer rotor and outputs them to each rotor. At this time, the braking command for the inner rotor 73 and the outer rotor 72 may be output to the rotors at the same time. This is to minimize the change in the amount of braking due to braking. When the inner rotor 73 is developed and braked and the outer rotor 72 is braked by the force, as shown in FIG. 9, the inner rotor RPM1 is braked before the outer rotor RPM2 '. Unlike FIG. 7, the rotation speed up to the stop of the outer rotor is increased at the time of braking power RPM2 'than at power generation braking RPMM. Referring to FIG. 10, it can be seen that the current I1 flowing in the inner rotor 73 for generating braking is greater than the current I2 flowing in the outer rotor 72 for braking of the power. That is, a large current flows instantaneously through the inner rotor for power generation braking, and the delay time T1 until stopping becomes relatively shorter than in the case of the braking force. On the other hand, the outer rotor that performs the braking of the current immediately becomes zero at the time of braking command output, while the delay time T2 until the stop is longer than that of the generating braking as shown in FIGS. 9 and 10.

Referring to FIG. 11, a washing machine according to another embodiment may be rotatably mounted in a main body 10 forming an external appearance, a tub 40 provided inside the main body 10, and the tub 40. And a main drum 50 for accommodating laundry objects therein, a sub drum 60 mounted inside the main drum 50 so as to be relatively rotatable with the main drum 50, and a stator 71 and the sub serve. An outer rotor 72 connected to the drum 60 and rotated outside the stator 71, and an inner rotor 73 connected to the main drum 50 and rotated inside the stator 71. And a control unit 100 for driving the outer rotor 72 and the inner rotor 73.

The control unit 100 drives the inner rotor 73 and is connected to the master control unit 110 and the master control unit 110 for detecting the first quantity based on the delay time of the inner rotor. And a slave controller 120 for driving the outer rotor 72 and sensing the second quantity based on a delay time of the outer rotor.

The master controller 110 generates a braking command for the outer rotor 72 and transmits the braking command to the slave controller 120, and then generates a braking command for the inner rotor 73 after a predetermined time. Here, the predetermined time is determined by the communication speed, that is, the communication delay between the master controller and the slave controller. For example, the predetermined time may be determined as 50 ms or the like. Each control unit is composed of different microcomputers and the like. The master controller and the slave controller simultaneously output the braking command to the inner rotor and the outer rotor.

After outputting the braking command, the master controller 110 detects the first quantity of the main drum 50 driven by the inner rotor 73, and the slave controller 120 is driven by the outer rotor 72. The second quantity of the sub drum 60 is sensed. At this time, the master control unit and the slave control unit detect the first amount and the second amount by counting the delay time until the stop of the inner rotor and the outer rotor and the number of pulses until the stop of rotation. Here, the constant rotational speed may be set to the inner rotor and the outer rotor, respectively, but may be set to one rotational speed, for example, 150 RPM, 160 RPM. In addition, although the first and second doses are detected based on the delay time, the first and second doses may be detected by counting the number of pulses according to rotation.

In addition, the control unit 100 can brake the outer rotor and the inner rotor in different manners or in the same manner. That is, the control unit 100 may generate and brake both the outer rotor and the inner rotor, or the braking of both, or the braking of the other and the braking of the other.

7 to 10, the master controller and the slave controller start the inner rotor and the outer rotor to increase the rotation speed to 160 RPM, which is a certain rotation speed, respectively. Then, the master controller generates a braking command for the outer rotor and transmits it to the slave controller. The master control unit also generates a braking command for the inner rotor. The master controller and the slave controller simultaneously output a braking command to the inner rotor and the outer rotor in consideration of the communication delay between the master controller and the slave controller. The master controller detects the first dose based on the delay time from the inner rotor to the stop after receiving the braking command. In addition, the slave control unit detects the second amount of air based on the delay time of the stop time after the outer rotor receives the braking command, and transmits the detected second amount to the master control unit. The master control unit determines the final amount using the first amount and the second amount. There may be various methods for detecting the final quantity, for example, a method of adding up the first and second amounts in a predetermined ratio, determining the first amount or the second amount, and most simply. The method which makes a 1st quantity into a final quantity can be used. As described above, FIGS. 7 and 8 illustrate a case in which a quantity of capacity is sensed after generating power braking for both the inner rotor and the outer rotor, and FIGS. This is the case when the quantity is detected.

Referring to FIG. 12, a method of detecting a quantity of washing machine according to an embodiment may include: a main body forming an appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; And a drive motor including a stator, an outer rotor connected to the sub drum and rotating outside of the stator, and an inner rotor connected to the main drum and rotating inside of the stator. Driving the rotor and the outer rotor (S110), and when the inner rotor and the outer rotor reach a constant rotational speed (YES in S120), braking the inner rotor and the outer rotor (S130), and the inner And detecting the first and second amounts of the main drum and the sub drum, respectively (S140 and S150) based on the delay time until the rotor and the outer rotor stop. In addition, the quantity detection method further comprises the step (S160) of displaying a value of one of the first amount, the second amount, and the final amount determined based on the first amount and the second amount. do. Hereinafter, the structure of the apparatus will be described with reference to FIGS. 1 to 6.

Referring to FIG. 7, the washing machine starts the inner rotor and the outer rotor, respectively, and increases the rotation speed to 160 RPM, which is a predetermined rotation speed (S110 and S120). Then, the washing machine generates a braking command for the inner rotor and the outer rotor and outputs them to each rotor (S130). At this time, the washing machine outputs braking commands for the inner rotor and the outer rotor to the rotors at the same time. This is to minimize the change in the amount of braking due to braking.

In the case of generating and braking both the inner rotor and the outer rotor, as shown in FIG. 7, the outer rotor RPM2 is generally braked before the inner rotor RPM1. Referring to FIG. 8, the current I1 flowing in the inner rotor is greater than the current I2 flowing in the outer rotor 72, and the delay time T1 of the inner rotor also stops according to the braking command. It can be seen that it is longer than the delay time T2 of the outer rotor.

On the other hand, when the inner rotor is developed and braked, and the outer rotor is braked by force, as shown in FIG. 9, the inner rotor RPM1 is braked before the outer rotor RPM2 '. Unlike FIG. 7, the rotation speed up to the stop of the outer rotor is increased at the time of braking power RPM2 'than at power generation braking RPMM. Referring to FIG. 10, it can be seen that the current I1 flowing in the inner rotor for generating braking is greater than the current I2 flowing in the outer rotor for braking of the power. That is, a large current flows instantaneously through the inner rotor for power generation braking, and the delay time T1 until stopping becomes relatively shorter than in the case of the braking force. On the other hand, the outer rotor that performs the braking of the current immediately becomes zero at the time of braking command output, while the delay time T2 until the stop is longer than that of the generating braking as shown in FIGS. 9 and 10.

The washing machine detects a first quantity and a second quantity based on the delay times T1 and T2 (S150). The washing machine may display the first quantity, the second quantity, or the final quantity determined by the first quantity and the second quantity on the screen through the output unit (S160). The washing machine uses the first quantity and the second quantity to determine the final quantity. There may be various methods for detecting the final quantity, for example, a method of adding up the first and second amounts in a predetermined ratio, determining the first amount or the second amount, and most simply. The method which makes a 1st quantity into a final quantity can be used.

Referring to FIG. 13, a method of detecting a quantity of washing machine according to another embodiment may include: a main body forming an appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; A drive motor including a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator; A master controller for driving the inner rotor; And a slave controller for driving the outer rotor, wherein the master controller and the slave controller respectively drive the inner rotor and the outer rotor, and the inner rotor and the outer rotor reach a constant rotational speed. When the master control unit brakes the inner rotor and the outer rotor, and the master control unit and the slave control unit respectively delay the inner and outer rotors based on the delay time until the stop of the main drum and the sub drum, respectively. And detecting the first and second doses. Hereinafter, the configuration of the apparatus will be described with reference to FIGS. 1 to 2, 4 to 6, and 11.

7 to 10, the master controller and the slave controller start the inner rotor and the outer rotor, respectively, and increase the rotation speed up to a predetermined rotation speed, that is, 160 RPM (S210, S220). Then, the master controller generates a braking command for the outer rotor and transmits it to the slave controller (S231, S232). In addition, the master control unit generates a braking command for the inner rotor (S233). The master controller and the slave controller simultaneously output a braking command to the inner rotor and the outer rotor in consideration of the communication delay between the master controller and the slave controller (S234). The master controller detects the first dose based on the delay time from the inner rotor to the stop after receiving the braking command (S250). In addition, the slave controller detects the second dose based on the delay time of the stop time after the outer rotor receives the braking command, and transmits the detected second dose to the master controller (S250). The master control unit determines the final amount using the first amount and the second amount. There may be various methods for detecting the final quantity, for example, a method of adding up the first and second amounts in a predetermined ratio, determining the first amount or the second amount, and most simply. The method which makes a 1st quantity into a final quantity can be used. The washing machine may display the first amount, the second amount, or the final amount determined by the first amount and the second amount on the screen through the output unit (S260).

As described above, the washing machine and its quantity detecting method according to the embodiments of the present invention allow the washing object moving in the drum of the washing machine to be changed in three dimensions and variously using two independently driven drums. Embodiments of the present invention can be washed three-dimensionally to the object to be washed to improve the washing performance of the washing machine, it is possible to reduce the washing time. Embodiments of the present invention improve the washing performance by allowing the washing object to be three-dimensional flow in consideration of the torque distribution, the mechanical force acting on the washing object, and the fluidity of the washing object by driving two drums. Embodiments of the present invention in the washing machine having two drums and a drive motor capable of driving them independently can accurately detect the amount of washing machine by detecting the quantity of each drum. Embodiments of the present invention improve the capacity detection performance of the washing machine more precisely by varying the quantity detection method for the quantity of the two drums, and reduces the washing water and electrical capacity required for washing, rinsing and dehydration stroke.

10: main body (cabinet) 20: inlet
30: control panel 40: tub
50: main drum 60: sub drum
70: drive motor 71: stator
72: outer rotor 73: inner rotor
81: outer shaft 82: inner shaft
91: main drum spider 95: sub drum spider
51, 61: lifter 100: control unit
110: master controller 120: slave controller
200: current detection unit

Claims (13)

A body forming an outer appearance;
Tub provided inside the main body;
A main drum rotatably mounted in the tub to accommodate laundry objects therein;
A sub drum mounted inside the main drum to be able to rotate relative to the main drum;
A drive motor including a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator; And
And a control unit for driving the inner rotor and the outer rotor.
Wherein the control unit comprises:
The inner rotor and the outer rotor are respectively driven to reach a constant rotational speed, and a braking command is generated to the inner rotor and the outer rotor, and the main drums are respectively based on a delay time until the inner rotor and the outer rotor are stopped. And a first quantity and a second quantity of the sub drum. The method of claim 1, wherein the control unit,
A washing machine characterized by braking the outer rotor by force and braking power generation of the inner rotor. The method of claim 2,
And the braking command is generated simultaneously to the inner rotor and the outer rotor. The method according to claim 1,
And a current detection unit configured to detect first and second currents flowing through the inner rotor and the outer rotor. The method according to claim 1,
And an output unit for displaying a value of one of the first amount, the second amount, and a final amount determined based on the first amount and the second amount. The method according to any one of claims 1 to 5, wherein the control unit,
A master controller for driving the inner rotor and sensing the first amount of quantity based on a delay time of the inner rotor; And
And a slave controller connected to the master controller and driving the outer rotor, the slave controller sensing the second quantity based on a delay time of the outer rotor. The method of claim 6, wherein the master control unit,
And generate a braking command for the outer rotor and transmit the braking command to the slave controller, and then generate a braking command for the inner rotor after a predetermined time. The method of claim 7, wherein
The predetermined time is a washing machine, characterized in that determined based on the communication speed between the master control unit and the slave control unit. A body forming an outer appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; And a drive motor including a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator.
Driving the inner rotor and the outer rotor, respectively;
Braking the inner rotor and the outer rotor when the inner rotor and the outer rotor reach a constant rotational speed; And
And detecting first and second amounts of the main drum and the sub drum, respectively, based on a delay time until the stop of the inner rotor and the outer rotor. A body forming an outer appearance; Tub provided inside the main body; A main drum rotatably mounted in the tub to accommodate laundry objects therein; A sub drum mounted inside the main drum to be able to rotate relative to the main drum; A drive motor including a stator, an outer rotor connected to the sub drum and rotating outside the stator, and an inner rotor connected to the main drum and rotating inside the stator; A master controller for driving the inner rotor; And a slave controller for driving the outer rotor.
Driving the inner rotor and the outer rotor by the master controller and the slave controller, respectively;
Braking the inner rotor and the outer rotor when the inner rotor and the outer rotor reach a predetermined rotation speed; And
Detecting, by the master control unit and the slave control unit, the first and second amounts of the main drum and the sub drum, respectively, based on a delay time until the stop of the inner rotor and the outer rotor, respectively; Way. The method of claim 10, wherein the braking step,
Generating, by the master controller, a braking command for the outer rotor to the slave controller;
Generating, by the master controller, a braking command to the inner rotor; And
And outputting the braking commands to the outer rotor and the inner rotor at the same time by the master control unit and the slave control unit. The method of claim 9, wherein the braking step comprises:
And a braking force of the outer rotor and generating and braking the inner rotor. The method of claim 12,
And displaying a value of one of the first amount, the second amount, and the final amount determined based on the first amount and the second amount.

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