KR102114861B1 - Laundry treatment machine and the method for operating the same - Google Patents

Abstract

The present invention relates to a laundry treatment apparatus, and its operation method. The operation method of the laundry treatment apparatus according to the embodiment of the present invention includes the steps of accelerating rotating the drum, rotating the drum at a constant speed after the accelerating rotation, and inclining the current command value of the motor for rotating the drum during the constant rotation, or And calculating the amount of foam in the drum based on the slope of the output current value flowing through the motor. Accordingly, bubble detection can be performed.

Description

Laundry treatment machine and the method for operating the same}

The present invention relates to a laundry treatment device, and an operation method thereof, and more particularly, to a laundry treatment device capable of performing foam detection, and an operation method thereof.

In general, the laundry treatment apparatus washes using the friction force of the rotating washing tank and the laundry receiving the driving force of the motor while the detergent, washing water, and laundry are put into the drum, so that there is little damage to the laundry and the laundry is tangled with each other. Can have a washing effect.

On the other hand, when the foam is excessively generated by the introduction of detergent during washing, frictional force may be generated, and dehydration may be difficult to enter. Accordingly, various methods for detecting foam generation have been discussed.

An object of the present invention is to provide a laundry treatment apparatus capable of performing foam detection, and an operation method thereof.

The operation method of the laundry treatment apparatus according to the embodiment of the present invention for achieving the above object is a step of accelerating and rotating the drum, a step of rotating the drum at a constant speed after the accelerated rotation, and a motor for rotating the drum when rotating at the same speed And calculating the amount of foam in the drum based on the slope of the current command value of or the slope of the output current value flowing through the motor.

In addition, the laundry treatment apparatus according to an embodiment of the present invention for achieving the above object, a drum, a motor for rotating the drum, and the drum to accelerate and rotate, and after the accelerated rotation, the drum is rotated at a constant speed, and when rotated at a constant speed, And a driving unit for calculating the amount of foam in the drum based on the slope of the current command value of the motor for rotating the drum or the output current value flowing through the motor.

According to an embodiment of the present invention, the laundry treatment apparatus rotates the drum at a constant speed after the accelerated rotation, and when rotating at the constant speed, based on the slope of the current command value of the motor for rotating the drum or the output current value flowing through the motor. , By calculating the amount of foam in the drum, it is possible to perform foam detection.

In particular, in the constant speed rotation section, not the acceleration section, it is possible to perform foam detection simply and accurately by exuding the amount of foam in the drum based on the slope of the current command value or the output current value of the motor.

And, when the amount of foam is more than a predetermined value, after removing the foam, by performing a dehydration stroke, it is possible to stably operate the laundry treatment device.

1 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.
FIG. 2 is an internal block diagram of the laundry treatment device of FIG. 1.
3 is an internal circuit diagram of the driving unit of FIG. 2.
4 is an internal block diagram of the inverter control unit of FIG. 3.
5A is a view for explaining an example of a bubble amount detection method.
5B is a view for explaining the amount of foam detected according to FIG. 5A.
6 is a flowchart illustrating an operation method of a laundry treatment apparatus according to an embodiment of the present invention.
7 to 9 are views referred to for describing the operation method of FIG. 6.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "modules" and "parts" for components used in the following description are given simply by considering the ease of writing this specification, and do not imply any special significance or role in itself. Therefore, the "module" and the "unit" may be used interchangeably.

1 is a perspective view showing a laundry treatment apparatus according to an embodiment of the present invention.

Referring to the drawings, the laundry treatment apparatus 100 is a drum-type laundry treatment apparatus, the cabinet 110 forming the exterior of the laundry treatment apparatus 100, and the cabinet 110 disposed inside the cabinet 110 The tub 120 supported by the tub, the drum 122 disposed inside the tub 120 and the cloth being washed, the motor 130 driving the drum 122, and the cabinet body 111 disposed outside the cabinet (110) includes a washing water supply device (not shown) for supplying washing water to the inside, and a drainage device (not shown) that is formed under the tub 120 to discharge the washing water to the outside.

A plurality of through holes 122A are formed in the drum 122 to allow washing water to pass, and after the laundry is lifted to a certain height when the drum 122 is rotated, a lifter is installed on the inner side of the drum 112 to be dropped by gravity. 124 may be disposed.

Cabinet 110, the cabinet body 111, the cabinet cover 112 is disposed on the front of the cabinet body 111 to be combined, and the cabinet cover 112 is disposed on the upper side and the control coupled to the cabinet body 111 It includes a panel 115 and a top plate 116 disposed on the control panel 115 and coupled to the cabinet body 111.

The cabinet cover 112 includes a fabric entrance and exit hole 114 formed to allow the entrance and exit of the fabric, and a door 113 that is rotatably disposed left and right to open and close the fabric entrance and exit hole 114.

The control panel 115 is provided with operation keys 117 for manipulating the operation state of the laundry treatment apparatus 100, and display devices disposed on one side of the operation keys 117 and displaying the operation status of the laundry treatment apparatus 100 ( 118).

The operation keys 117 and the display device 118 in the control panel 115 are electrically connected to a control unit (not shown), and the control unit (not shown) electrically controls each component of the laundry treatment device 100 and the like. do. The operation of the control unit (not shown) will be described later.

Meanwhile, an auto balance (not shown) may be provided on the drum 122. The auto balance (not shown) is for reducing vibration generated according to the eccentric amount of laundry accommodated in the drum 122, and may be implemented as a liquid balance, a ball balance, or the like.

On the other hand, although not shown in the drawing, the laundry treatment apparatus 100 may further include a vibration sensor that measures the vibration amount of the drum 122 or the vibration amount of the cabinet 110.

FIG. 2 is an internal block diagram of the laundry treatment device of FIG. 1.

Referring to the drawings, the laundry treatment apparatus 100 controls the driving unit 220 by the control operation of the control unit 210, and the driving unit 220 drives the motor 230. Accordingly, the drum 122 is rotated by the motor 230.

The control unit 210 operates by receiving an operation signal from the operation key 1017. Accordingly, washing, rinsing, and dehydration strokes can be performed.

In addition, the control unit 210 may control the display 118 to display a washing course, washing time, dehydration time, rinsing time, or the like, or a current operating state.

Meanwhile, the control unit 210 controls the driving unit 220 to control the motor 230 to operate. For example, based on the current detection unit 225 for detecting the output current flowing in the motor 230 and the position detection unit 235 for detecting the position of the motor 230, the driving unit 220 to rotate the motor 230 ) Can be controlled. In the drawing, the detected current and the detected position signal are shown as being input to the driving unit 220, but are not limited thereto, and are input to the control unit 210 or input to the control unit 210 and the driving unit 220 together. It is also possible.

The driving unit 220 is for driving the motor 230, and may include an inverter (not shown) and an inverter control unit (not shown). In addition, the driving unit 220 may be a concept that further includes a converter, or the like, that supplies DC power input to an inverter (not shown).

For example, when the inverter control unit (not shown) outputs a pulse width modulation (PWM) type switching control signal (Sic in FIG. 3) to an inverter (not shown), the inverter (not shown) performs a high-speed switching operation, AC power of a predetermined frequency may be supplied to the motor 230.

The driving unit 220 will be described later with reference to FIG. 3.

3 is an internal circuit diagram of the driving unit of FIG. 2.

Referring to the drawings, the driving unit 220 according to an embodiment of the present invention, a converter 410, an inverter 420, an inverter control unit 430, a dc stage voltage detector (B), a smoothing capacitor (C), And it may include an output current detector (E). In addition, the driving unit 220 may further include an input current detection unit A, a reactor L, and the like.

The reactor L is disposed between the commercial AC power sources 405 and v _s and the converter 410 to perform power factor correction or boost operation. In addition, the reactor L may also function to limit harmonic currents due to high-speed switching of the converter 410.

The input current detector A can detect the input current i _s input from the commercial AC power supply 405. To this end, as the input current detector A, a current trnasformer (CT), a shunt resistor, or the like can be used. The detected input current i _s may be input to the inverter controller 430 as a pulsed discrete signal.

The converter 410 converts and outputs the commercial AC power 405 that has passed through the reactor L into DC power. Although the commercial AC power source 405 is illustrated as a single-phase AC power source in the drawing, it may be a three-phase AC power source. The internal structure of the converter 410 also varies according to the type of the commercial AC power source 405.

Meanwhile, the converter 410 may be made of a diode or the like without a switching element, and may perform a rectification operation without a separate switching operation.

For example, in the case of a single-phase AC power supply, four diodes may be used in the form of a bridge, and in the case of a three-phase AC power supply, six diodes may be used in the form of a bridge.

Meanwhile, as the converter 410, for example, a half-bridge type converter in which two switching elements and four diodes are connected may be used, and in the case of a three-phase AC power source, six switching elements and six diodes may be used. .

When the converter 410 includes a switching element, a step-up operation, power factor improvement, and DC power conversion may be performed by a switching operation of the switching element.

The smoothing capacitor C smooths the input power and stores it. In the drawing, one element is illustrated as the smoothing capacitor C, but a plurality of elements are provided to secure element stability.

On the other hand, in the drawing, it is illustrated as being connected to the output terminal of the converter 410, but is not limited to this, DC power may be directly input. For example, DC power from a solar cell is applied to the smoothing capacitor C It can be directly input or DC / DC converted and input. Hereinafter, parts illustrated in the drawings are mainly described.

On the other hand, since both ends of the smoothing capacitor C have direct current power, they may be referred to as a dc terminal or a dc link terminal.

The dc stage voltage detector B may detect the dc stage voltage Vdc that is both ends of the smoothing capacitor C. To this end, the dc stage voltage detector B may include a resistance element, an amplifier, and the like. The detected dc stage voltage (Vdc) may be input to the inverter control unit 430 as a pulsed discrete signal.

The inverter 420 includes a plurality of inverter switching elements, and converts the DC power supply (Vdc) smoothed by the on / off operation of the switching element into three-phase AC power (va, vb, vc) of a predetermined frequency, thereby three-phase It can be output to the synchronous motor 230.

In the inverter 420, the upper and lower switching elements Sa, Sb and Sc and the lower and lower switching elements S'a, S'b and S'c are connected in series with each other, and a total of three pairs of upper and lower arms. The switching elements are connected in parallel with each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in reverse parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c.

The switching elements in the inverter 420 perform on / off operation of each switching element based on the inverter switching control signal Sic from the inverter control unit 430. Thereby, the three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter controller 430 may control the switching operation of the inverter 420. To this end, the inverter control unit 430 may receive the output current i _o detected by the output current detection unit E.

In order to control the switching operation of the inverter 420, the inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420. The inverter switching control signal Sic is a pulse width modulation method (PWM) switching control signal, which is generated and output based on the output current value i _o detected by the output current detection unit E. Detailed operation of the output of the inverter switching control signal Sic in the inverter control unit 430 will be described later with reference to FIG. 4.

The output current detector E detects the output current i _o flowing between the inverter 420 and the three-phase motor 230. That is, the current flowing through the motor 230 is detected. The output current detection unit E can detect all the output currents ia, ib, and ic of each phase, or may detect the output currents of two phases by using three-phase balance.

The output current detector E may be located between the inverter 420 and the motor 230, and a current trnasformer (CT), shunt resistor, or the like may be used for current detection.

When a shunt resistor is used, three shunt resistors are located between the inverter 420 and the synchronous motor 230, or three lower arm switching elements S'a, S'b, S'c of the inverter 420 It is possible that each end is connected to). On the other hand, using a three-phase equilibrium, it is also possible that two shunt resistors are used. On the other hand, when one shunt resistor is used, it is also possible that the shunt resistor is disposed between the above-described capacitor C and the inverter 420.

The detected output current (i _o ) is a discrete signal in the form of a pulse and can be applied to the inverter control unit 430, and the inverter switching control signal (Sic) based on the detected output current (i _o ) Is created. Hereinafter, it will be described that the detected output current (i _o ) is the three-phase output current (ia, ib, ic).

On the other hand, the three-phase motor 230 is provided with a stator and a rotor, and each phase (a, b, c phase) is applied to the coil of the stator of each phase with an AC power of a predetermined frequency, the rotor rotates Will do.

Such a motor 230 is, for example, a surface-mounted permanent magnet synchronous motor (Surface-Mounted Permanent-Magnet Synchronous Motor; SMPMSM), an embedded permanent magnet synchronous motor (Interior Permanent Magnet Synchronous Motor; IPMSM), and a synchronous reel And a Synchronous Reluctance Motor (Synrm). Among them, SMPMSM and IPMSM are Permanent Magnet Synchronous Motor (PMSM) with permanent magnet applied, and Synrm has no permanent magnet.

Meanwhile, when the converter 410 includes a switch element, the inverter control unit 430 may control the switching operation of the switching element in the converter 410. To this end, the inverter control unit 430 may receive an input current i _s detected by the input current detection unit A. In addition, the inverter control unit 430 may output a converter switching control signal Scc to the converter 410 in order to control the switching operation of the converter 410. The converter switching control signal Scc is a pulse width modulation (PWM) type switching control signal, and may be generated and output based on the input current i _s detected from the input current detection unit A.

Meanwhile, the position detection unit 235 may detect the position of the rotor of the motor 230. To this end, the position sensor 235 may include a hall sensor. The detected rotor position H is input to the inverter control unit 430 and is used based on speed calculation.

4 is an internal block diagram of the inverter control unit of FIG. 3.

Referring to FIG. 4, the inverter control unit 430 includes an axis conversion unit 510, a speed calculation unit 520, a current command generation unit 530, a voltage command generation unit 540, an axis conversion unit 550, and A switching control signal output unit 560 may be included.

The axis conversion unit 510 receives the three-phase output currents ia, ib, and ic detected by the output current detection unit E, and converts them into two-phase currents iα and iβ in the stop coordinate system.

Meanwhile, the axis conversion unit 510 may convert the two-phase currents iα and iβ of the stationary coordinate system into two-phase currents id and iq of the rotational coordinate system.

)를 연산할 수 있다. 즉, 위치 신호에 기반하여, 시간에 대해, 나누면, 속도를 연산할 수 있게 된다.The speed calculation unit 520 is based on the position signal H of the rotor input from the position detection unit 235, the speed (

). That is, based on the position signal, it is possible to calculate the speed by dividing with respect to time.

)와 연산된 속도(

)를 출력할 수 있다.On the other hand, the speed calculation unit 520, the position calculated based on the input position signal (H) of the rotor (

) And calculated speed (

).

)와 목표 속도(ω)에 기초하여, 속도 지령치(ω^* _r)를 연산하며, 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(530)는, 연산 속도(

)와 목표 속도(ω)의 차이인 속도 지령치(ω^* _r)에 기초하여, PI 제어기(535)에서 PI 제어를 수행하며, 전류 지령치(i^* _q)를 생성할 수 있다. 도면에서는, 전류 지령치로, q축 전류 지령치(i^* _q)를 예시하나, 도면과 달리, d축 전류 지령치(i^* _d)를 함께 생성하는 것도 가능하다. 한편, d축 전류 지령치(i^* _d)의 값은 0으로 설정될 수도 있다. On the other hand, the current command generation unit 530, the calculation speed (

) And the target speed ω, the speed command value ω ^* _r is calculated, and the current command value i ^* _q is generated based on the speed command value ω ^* _r . For example, the current command generation unit 530, the calculation speed (

) And the target speed ω, which is the difference between the speed command value (ω ^* _r ) and the PI controller 535, performs PI control and generates a current command value (i ^* _q ). In the drawing, as the current command value, the q-axis current command value (i ^* _q ) is illustrated, but unlike the drawing, it is also possible to generate the d-axis current command value (i ^* _d ) together. Meanwhile, the value of the d-axis current command value (i ^* _d ) may be set to 0.

Meanwhile, the current command generation unit 530 may further include a limiter (not shown) that limits the level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 540, the d-axis, q-axis current (i _d , i _q ) axis-converted in the two-phase rotation coordinate system in the axis conversion unit, the current command value in the current command generation unit 530, etc. Based on i ^* _d , i ^* _q ), the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are generated. For example, the voltage command generation unit 540 performs PI control in the PI controller 544 based on the difference between the q-axis current i _q and the q-axis current command value i ^* _q , q The axial voltage setpoint (v ^* _q ) can be generated. In addition, the voltage command generation unit 540 performs PI control in the PI controller 548 based on the difference between the d-axis current i _d and the d-axis current command value i ^* _d , and the d-axis voltage The setpoint (v ^* _d ) can be generated. Meanwhile, the value of the d-axis voltage command value (v ^* _d ) may be set to 0, corresponding to the case where the value of the d-axis current command value (i ^* _d ) is set to 0.

Meanwhile, the voltage command generation unit 540 may further include a limiter (not shown) that limits the level so that the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) do not exceed an allowable range. .

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are input to the axis conversion unit 550.

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit 550, the position calculated by the speed calculation unit 520 (

), D-axis, and q-axis voltage command values (v ^* _d , v ^* _q ) are input and axis conversion is performed.

)가 사용될 수 있다.First, the axis conversion unit 550 performs conversion from a two-phase rotational coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculation unit 520 (

) Can be used.

Then, the axis conversion unit 550 converts the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axis conversion unit 1050 outputs a three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

The switching control signal output unit 560 generates a switching control signal (Sic) for the inverter according to the pulse width modulation (PWM) method based on the three-phase output voltage command value (v ^* a, v ^* b, v ^* c) And output.

The output inverter switching control signal Sic may be converted into a gate driving signal by a gate driver (not shown), and input to the gate of each switching element in the inverter 420. Accordingly, each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 420 performs a switching operation.

On the other hand, during the washing process, when detergent is introduced into the drum 122, the foam caused by the detergent acts as a friction force. Particularly, when the detergent is excessively injected, due to a large frictional force, it may be difficult to enter the dehydration stroke. Accordingly, in the related art, a bubble detection method, as shown in FIG. 5A, was used.

5A is a view for explaining an example of a method for detecting the amount of foam, and FIG. 5B is a view for explaining the amount of foam detected according to FIG. 5A.

5A (a) shows a graph of the rotational speed of the drum. The Tac section represents the accelerated rotation section of the drum, and the Tsus section represents the constant rotation section of the drum. In the figure, the drum 122 is rotated at a speed of ω _MA during the constant-speed rotation section of the drum 122.

5A (B) illustrates a graph of the output current iox, which corresponds to the rotational speed of the drum of FIG. 5A (A).

Conventionally, for the foam detection, during the acceleration section (Tac) of the drum 122, the foam amount was calculated using the maximum value (imax) of the output current value. This maximum value (imax) eventually occurred in the last section (Tx) of the acceleration section (Tac).

On the other hand, foam generation is related to the rotational speed of the drum 122, and usually occurs a lot in the acceleration section after 300 rpm. Therefore, conventionally, the bubble amount was calculated using the maximum value (imax) of the output current value flowing through the motor during the acceleration period after 300 rpm.

However, when the end speed of the acceleration section is around 300 rpm, for example, about 350 rpm, a shortcoming period in which the amount of bubbles can be calculated is shortened by detecting the maximum value (imax) of the output current value. .

In addition, when the eccentricity amount in the drum 122 is large, since the output current value is influenced by the large eccentricity amount, there is a high possibility of miscalculation when calculating the foam amount.

5B illustrates a graph of calculating the amount of foam, according to the method of FIG. 5A.

Wc1 is a detergent-free, Wc2 is a first detergent, Wc3 is a second detergent, and Wc4 is a third detergent. In the experiment, it was assumed that the detergent performance increased as the first detergent went to the third detergent.

According to the method of FIG. 5A, during the acceleration period Tac of the drum 122, using the maximum value (imax) of the output current value applied to the motor, as a result of measuring the amount of bubbles, for Wc1 to Wc4, respectively The amount of bubbles in BLa, BLb, BLc, BLd was detected.

That is, in the second detergent Wc3, the amount of bubbles BLc is the most, and in addition, in the detergent-free Wc1, the first detergent Wc2, and the third detergent Wc4, it was detected that the amount of bubbles is similar.

According to FIG. 5B, it can be seen that in the detergent-free Wc1, the first detergent Wc2, and the third detergent Wc4, the amount of foam is similar, and the discrimination power is weak.

In the present invention, in order to solve this problem, it is assumed that the bubble amount is calculated in the constant velocity rotation section after the acceleration rotation of the drum, rather than the calculation of the bubble amount in the acceleration rotation section of the drum. This will be described with reference to FIG. 6 and below.

6 is a flowchart illustrating an operation method of a laundry treatment apparatus according to an embodiment of the present invention, and FIGS. 7 to 9 are views referred to for explaining the operation method of FIG. 6.

Referring to the drawings, the driving unit 220, the drum rotates to accelerate (S610).

According to the washing process, after detergent is introduced into the drum 122, the driving unit 220 may accelerate and rotate the drum 122.

To this end, the inverter control unit 430 may continue to increase the q-axis current command value (i ^* _q ) corresponding to the torque. Accordingly, the output current applied to the motor 230 also increases continuously.

Next, the driving unit 220 rotates the drum at a constant speed (S615).

After the accelerated rotation, the driving unit 220 rotates the drum at a constant speed. In a speed range of approximately 300 rpm or more, the drive unit 220 rotates the drum at a constant speed.

To this end, the inverter control unit 430 may vary the q-axis current command value (i ^* _q ) corresponding to the torque. Accordingly, the output current value applied to the motor 230 fluctuates.

Next, the driving unit 220 calculates the amount of foam in the drum based on the slope of the current command value of the motor for rotating the drum or the output current value flowing through the motor when rotating at a constant speed (S620). In particular, the inverter control unit 430 or the control unit 210 in the driving unit 220 calculates the amount of foam in the drum based on the slope of the current command value of the motor or the output current value flowing through the motor.

7 is a diagram illustrating a bubble amount detection method according to an embodiment of the present invention.

7 (a) shows a graph of the rotational speed of the drum. The Tac section represents the accelerated rotation section of the drum, and the Tsus section represents the constant rotation section of the drum. In the figure, the drum 122 is rotated at a speed of ω _MA during the constant-speed rotation section of the drum 122.

Fig. 7 (b) illustrates a graph of the output current io corresponding to the rotational speed of the drum of Fig. 7 (a).

In the present invention, for foam detection, a bubble is generated by using the slope of the output current value or the slope of the current command value during the constant velocity rotation section Tsus of the drum 122, not the acceleration section Tac of the drum 122. Calculate the quantity.

The bubble amount is proportional to the slope of the output current value or the slope of the current command value. That is, as the slope of the output current value or the slope of the current command value increases, the amount of bubbles increases, and the smaller the slope, the smaller the amount of bubbles can be calculated.

Meanwhile, the constant velocity rotation section Tsus may be divided into a stabilization section Ts1 for stabilizing the speed of the drum 9122 after the drum acceleration and a bubble detection section Ts2 for foam detection after the stabilization period. In addition, the bubble detection may be performed only in the bubble detection period Ts2.

FIG. 7 (b) illustrates that during the bubble detection period Ts2, the output current value is variable, but is increased while changing, generally according to a predetermined slope S1.

The inverter control unit 430 or the control unit 210 in the driving unit 220 may calculate the slope S1 of the output current value in consideration of variable output current values during the bubble detection period Ts2. Then, the bubble amount BB1 may be calculated based on the calculated slope S1 of the output current value.

On the other hand, in the drawing, the amount of foam was calculated based on the slope of the output current value of the motor, but separately, it is also possible to calculate the amount of foam based on the slope of the current command value inside the inverter control unit 430.

)를 파악할 수 있다. 그리고, 거품 감지 구간(Ts2) 동안, 전류 지령치의 크기 변화를 살펴보면, 전류 지령치의 크기의 기울기를 산출할 수 있다.
According to the current command generation unit 530 of FIG. 4, the d-axis current command value (i ^* _d ) and the q-axis current command value (i ^* _q ) are generated, and when combined, the magnitude of the current command value (

). And, during the bubble detection period Ts2, if the size change of the current command value is examined, the slope of the size of the current command value can be calculated.

On the other hand, the amount of foaming may vary depending on the type of detergent input in the drum 122.

8 is a diagram illustrating a bubble amount detection method according to another embodiment of the present invention.

8 (a) shows a graph of the rotational speed of the drum. The Tac section represents the accelerated rotation section of the drum, and the Tsus section represents the constant rotation section of the drum. In the figure, the drum 122 is rotated at a speed of ω _MA during the constant-speed rotation section of the drum 122.

8 (b) illustrates a graph of the output current io1, corresponding to the rotational speed of the drum of FIG. 8 (a), according to the first detergent, and FIG. 8 (c), according to the second detergent , A graph of the output current io2 corresponding to the rotational speed of the drum in Fig. 8A is illustrated. At this time, it is premised that the detergent performance of the first detergent is better than that of the second detergent.

During the bubble detection period Ts2, the slope of the output current according to the first detergent in FIG. 8 (b) is Sc1, and the slope of the output current according to the second detergent in FIG. 8 (c) represents Sc2.

On the other hand, by expanding the foam detection algorithm, it is possible to determine the type of detergent. That is, during the bubble detection period Ts2, based on the slope of the output current, it is also possible to distinguish the detergent type.

9 illustrates graphs for calculating the amount of foam according to a plurality of detergent types.

Wc1 is a detergent-free, Wc2 is a first detergent, Wc3 is a second detergent, and Wc4 is a third detergent. In the experiment, it was assumed that the detergent performance increased as the first detergent went to the third detergent.

According to the method of FIGS. 6 and 7, during the foam detection section Ts2 of the constant speed rotation section Tsus in which the drum 122 rotates at a constant speed, the amount of foam is generated using the slope of the output current value applied to the motor As a result of measurement, for Wc1 to Wc4, the amount of bubbles of BL1, BL2, BL3, and BL4, respectively, was detected.

That is, the amount of bubbles BL4 in the third detergent Wc4 is the most, and sequentially, the amount of bubbles BL3 corresponding to the second detergent Wc3, and the amount of bubbles BL2 corresponding to the first detergent Wc2 ), It can be seen that the amount of bubbles BL1 corresponding to the detergent-free Wc1 decreases.

That is, it can be seen that, for the detergent performance, the amount of foam is suitably detected. Accordingly, when the amount of foam is calculated by the method of the present invention, it is possible to perform foam detection simply and accurately.

Next, the driving unit 220 determines whether the amount of foam is equal to or greater than a predetermined value (S625). Then, if applicable, the drum is stopped (S630). Then, the driving unit 220 performs a bubble removal operation (S635). On the other hand, after the foam removal operation, the driving unit 220 is controlled to enter the dehydration stroke.

The inverter control unit 430 or the control unit 210 in the driving unit 220 stops and stops the rotation of the drum 122 at a constant speed when the calculated bubble amount BB is greater than or equal to the allowable value. That is, all switching elements in the inverter 420 are turned off.

Then, a bubble removal operation is performed. That is, a predetermined amount of water is injected into the drum 122. At this time, the amount of water input may be proportional to the amount of foam. After that, the drum 122 can be rotated to remove bubbles and enter the dehydration stroke.

On the other hand, this defoaming operation is not limited to one time, and may be repeated several times. Accordingly, bubbles can be completely removed. Also, the bubble detection operation may be repeated several times in conjunction with the bubble removal operation.

On the other hand, according to an embodiment of the present invention, the calculation of the amount of foam is described as being applied to the sensor-type driving unit 220 having the position sensing unit 235, but, alternatively, it is also applicable to the sensorless method.

That is, when the driving unit does not include the position sensing unit 235, the driving unit may further include an output voltage detection unit for detecting a phase voltage applied to the motor in addition to the output current detection unit. Then, the position of the rotor of the motor 230 can be estimated based on the detected output current and output voltage. Therefore, the speed calculating unit 520 of FIG. 4 may be replaced with an estimation unit for rotor position estimation and speed estimation.

Even in this case, within the constant-speed rotation section of the drum, the amount of foam detection based on the above-described slope of the output current or the slope of the current command value is applicable.

The laundry treatment apparatus according to the embodiment of the present invention is not limited to the configuration and method of the embodiments described as described above, and the embodiments are all or part of each embodiment so that various modifications can be made. May be selectively combined.

On the other hand, the operation method of the laundry treatment apparatus of the present invention can be implemented as a code that can be read by the processor on a recording medium readable by the processor provided in the laundry treatment device. The processor-readable recording medium includes all kinds of recording devices in which data that can be read by the processor are stored.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be implemented by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims (13)

Accelerating and rotating the drum;
After the accelerated rotation, rotating the drum at constant speed; And
In the case of the constant-speed rotation, calculating the amount of foam in the drum based on the slope of the current command value of the motor for rotating the drum or the output current value flowing through the motor.
The slope of the current command value or the slope of the output current value varies depending on the type of detergent,
According to the slope of the current command value or the slope of the output current value, operating method of the laundry treatment apparatus, characterized in that to classify the detergent type. According to claim 1,
Stopping the drum when the amount of foam is equal to or greater than a predetermined value; And
Removing the foam in the drum; Method of operating a laundry treatment apparatus further comprising. According to claim 2,
After the defoaming step, entering the dehydration step; Method of operating a laundry treatment apparatus further comprising. According to claim 1,
The constant velocity rotation section during the constant velocity rotation,
After the acceleration, it is divided into a stabilization section for stabilizing the speed of the drum and a foam detection section for foam detection after the stabilization section,
The bubble amount calculation step,
During the foam detection period, a method of operating a laundry treatment apparatus characterized in that the amount of foam in the drum is calculated based on a slope of a current command value of the motor or a slope of an output current value flowing through the motor. The method of claim 1 or 4,
The amount of foam, the operating method of the laundry treatment apparatus, characterized in that proportional to the slope of the current command value or the slope of the output current value. drum;
A motor for rotating the drum; And
The drum is accelerated to rotate, and after the accelerated rotation, the drum is rotated at a constant speed, and when the constant rotation is rotated, based on a slope of a current command value of the motor for rotating the drum or an output current value flowing through the motor, the Includes; a driving unit for calculating the amount of foam in the drum,
The slope of the current command value or the slope of the output current value varies depending on the type of detergent,
The driving unit,
A laundry treatment apparatus characterized by classifying the detergent type according to the slope of the current command value or the slope of the output current value. The method of claim 6,
The driving unit,
When the amount of foam is more than a predetermined value, control to stop the drum,
Laundry processing apparatus characterized in that to remove the foam in the drum. The method of claim 7,
The driving unit,
After the defoaming step, laundry treatment apparatus characterized in that to control to enter the dehydration stroke. The method of claim 6,
The constant velocity rotation section during the constant velocity rotation,
After the acceleration, it is divided into a stabilization section for stabilizing the speed of the drum and a foam detection section for foam detection after the stabilization section,
The driving unit,
During the foam detection period, the laundry processing apparatus characterized in that the amount of foam in the drum is calculated based on the slope of the current command value of the motor or the output current value flowing through the motor. The method according to claim 6 or 9,
The amount of foaming, laundry treatment apparatus, characterized in that proportional to the slope of the current command value or the slope of the output current value. The method of claim 6,
The driving unit,
An inverter that converts DC power into AC power and outputs the AC power to the motor;
A position sensing unit that senses the position of the rotor of the motor;
A current detection unit detecting an output current flowing through the motor;
And an inverter control unit controlling the inverter based on the sensed rotor position and the output current. The method of claim 11,
The inverter control unit,
A speed calculator configured to calculate rotor speed information of the motor based on the sensed position information;
A current command generator for generating the current command value based on the speed information and the speed command value;
A voltage command generator for generating a voltage command value based on the current command value and the detected output current; And
And a switching control signal output unit outputting a switching control signal for driving the inverter based on the voltage command value. The method of claim 6,
The driving unit,
An inverter that converts DC power into AC power and outputs the AC power to the motor;
And an inverter control unit controlling the inverter based on an output current and an output voltage flowing through the motor.

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