KR20160014992A - Laundry treatment machine - Google Patents

Abstract

The present invention relates to a laundry treatment machine. According to an embodiment of the present invention, the laundry treatment machine comprises: a washing tank: a motor to rotate the washing tub; and a drive unit to drive the motor. The drive unit comprises: an inverter to convert prescribed DC power into AC power of a prescribed frequency and output the AC power to the motor; and an inverter control unit to control the inverter. A waveform of an output voltage of the inverter driven by control of the inverter control unit comprises an increasing section in which the output voltage increases, a first constant section, a decreasing section, and a second constant section. Accordingly, cogging torque can be reduced when the motor rotates.

Description

[0001] Laundry treatment machine [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a laundry processing apparatus, and more particularly, to a laundry processing apparatus capable of reducing a cogging torque during rotation of a motor.

In general, the laundry processing apparatus performs washing using the friction force of the laundry and the washing machine, which is rotated by receiving the driving force of the motor, in a state where the detergent, the washing water and the laundry are put in the drum, so that the laundry is hardly damaged, You can get a washing effect.

On the other hand, various speeds or various strokes are required for driving the motor in the laundry processing apparatus, and noise is increased during the rotation of the motor. Therefore, various measures for reducing the noise are discussed.

An object of the present invention is to provide a laundry processing device capable of reducing cogging torque at the time of motor rotation.

It is another object of the present invention to provide a laundry processing apparatus capable of reducing the noise of a motor during operation of the laundry processing apparatus.

According to an aspect of the present invention, there is provided a laundry processing apparatus including a washing tub, a motor for rotating the washing tub, and a driving unit for driving the motor. And an inverter control unit for controlling the inverter. The waveform of the output voltage of the inverter driven by the control of the inverter control unit includes a rising period in which the output voltage rises, a rising period in which the output voltage rises, A falling period, and a second predetermined period.

According to another aspect of the present invention, there is provided a laundry processing apparatus including a washing machine, a motor for rotating the washing machine, and three pairs of switching elements each pairing the upper and lower arm switching elements, The three pairs of switching elements are turned on or off so that the output voltage is divided into a rising section, a first predetermined section, a falling section and a second predetermined section. During the first predetermined section and the second predetermined section, And an inverter that turns off all of the switching elements.

According to the embodiment of the present invention, the laundry processing apparatus further comprises a controller for controlling the inverter controller such that the waveform of the output voltage of the inverter driven by the inverter controller controls the rising period, the first constant period, the falling period, . Particularly, since the first constant interval and the second constant interval are symmetrically arranged, the cogging torque is reduced during the rotation of the motor. In addition, noise is reduced.

Further, the temperature rise of the switching element in the inverter can be reduced.

Further, since the line-to-line voltage of the motor appears in the form of a sinusoidal wave, the distortion of the line-to-line current can be reduced and the vibration of the laundry processing apparatus can be suppressed.

In addition, the motor can be stably driven by driving the motor with a constant output voltage waveform irrespective of the motor speed or the stroke section. Further, the manufacturing cost is reduced.

1 is a perspective view illustrating a laundry processing apparatus according to an embodiment of the present invention.
Fig. 2 is a side cross-sectional view of the laundry processing apparatus of Fig. 1;
3 is an internal block diagram of the laundry processing apparatus of FIG.
4 is an internal circuit diagram of the driving unit of FIG.
5 is an internal block diagram of the inverter control unit of FIG.
6 illustrates a waveform of the output voltage of the inverter according to an embodiment of the present invention.
Figure 7 illustrates a line voltage waveform based on the waveform of the output voltage of the inverter of Figure 6;
Figures 8A and 8B illustrate inverter output voltage waveforms for comparison with Figure 6.
9A to 9B illustrate the waveform of the output voltage of the inverter and the resulting line-to-line voltage waveform according to another embodiment of the present invention.
9C to 9D illustrate the waveform of the output voltage of the inverter and thus the line voltage waveform according to another embodiment of the present invention.
FIG. 10 is a view showing an example of the motor rotation speed during the washing stroke of FIG.
Fig. 11 is a view showing an example of the motor rotation speed during the dehydration stroke in Fig. 9. Fig.
12 is a perspective view illustrating a laundry processing apparatus according to another embodiment of the present invention.

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

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

FIG. 1 is a perspective view showing a laundry processing apparatus according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the laundry processing apparatus of FIG. 1.

Referring to FIGS. 1 and 2, the laundry processing apparatus 100 according to an embodiment of the present invention includes a dryer or the like for inserting laundry, rinsing and dewatering, The following description will focus on a washing machine.

The washing machine 100 includes a casing 110 forming an outer appearance, operation keys for receiving various control commands from a user, and a display for displaying information on the operating state of the washing machine 100, thereby providing a user interface And a door 113 which is rotatably installed in the casing 110 and opens and closes the entrance holes through which the laundry enters and exits.

The casing 110 includes a main body 111 for forming a space in which various components of the washing machine 100 can be accommodated and a main body 111 provided on the main body 111, And a top cover 112 that forms a bag entrance / exit hole.

The casing 110 is described as including the main body 111 and the top cover 112, but the casing 110 is not limited thereto as long as it forms the appearance of the washing machine 100.

The support rod 135 is described as being coupled to the top cover 112, which is one of the components constituting the casing 110, but is not limited thereto, And that it is possible.

The control panel 115 includes operation keys 117 for operating an operation state of the laundry processing apparatus 100 and a display (not shown) disposed on one side of the operation keys 117 and for displaying the operation state of the laundry processing apparatus 100 118).

The door 113 opens and closes a draw-in / out hole (not shown) formed in the top cover 112 and may include a transparent member such as tempered glass so that the inside of the main body 111 can be seen.

The washing machine 100 may include a washing tub 120. The washing tub 120 may include an outer tub 124 containing washing water and an inner tub 122 rotatably installed in the outer tub 124 to receive laundry. A balancer 134 may be provided on the upper portion of the washing tub 120 to compensate eccentricity generated when the washing tub 120 rotates.

Meanwhile, the washing machine 100 may include a pulsator 133 rotatably disposed under the washing tub 120.

The driving device 138 is to provide a driving force for rotating the inner tank 122 and / or the pulsator 133. A clutch (not shown) for selectively transmitting the driving force of the drive unit 138 to rotate only the inner tank 122, only the pulsator 133 is rotated, or the inner tank 122 and the pulsator 133 are rotated at the same time .

On the other hand, the driving unit 138 is operated by the driving unit 220 of FIG. 3, that is, the driving circuit. This will be described later with reference to FIG.

Meanwhile, the top cover 112 is provided with a detergent box 114 capable of receiving various detergent such as laundry detergent, fabric softener and / or bleach, (114) and then into the inner tank (122).

A plurality of holes (not shown) are formed in the inner tank 122 so that the wash water supplied to the inner tank 122 flows to the outer tank 124 through the plurality of holes. A water supply valve 125 for interrupting the water supply flow path 123 may be provided.

A drain valve 145 for draining the wash water in the outer tub 124 through the drainage flow path 143 and interrupting the drainage flow path 143 and a drain pump 141 for pumping the wash water may be provided.

One end of the support rod 135 is connected to the casing 110 and the other end of the support rod 135 is connected to the outer tank 124 by the suspension 150. [ do.

The suspension 150 cushions the outer tub 124 to vibrate during the operation of the washing machine 100. For example, the outer tub 124 may be vibrated by the vibration generated as the inner tub 122 rotates. During the rotation of the inner tub 122, the eccentricity of the laundry contained in the inner tub 122, It is possible to buffer vibrations due to various factors such as rotation speed or resonance characteristics.

3 is an internal block diagram of the laundry processing apparatus of FIG.

Referring to the drawings, in the laundry processing apparatus 100, the driving unit 220 is controlled by a control operation of the control unit 210, and the driving unit 220 drives the motor 230. Accordingly, the washing water is rotated by the motor 230 to the washing tub 120.

The control unit 210 receives an operation signal from the operation key 1017 and performs an operation. Thus, washing, rinsing and dewatering can be performed.

In addition, the control unit 210 may control the display 118 to display a wash course, a wash time, a dehydration time, a rinse time, or a current operation state.

On the other hand, the control unit 210 controls the driving unit 220 to operate the motor 230. For example, based on the current detection unit 225 for detecting the output current flowing through the motor 230 and the position sensing unit 220 for sensing the position of the motor 230, the driving unit 220 Can be controlled. The detected current and the detected position signal are inputted to the driving unit 220. The present invention is not limited thereto and may be applied to either the control unit 210 or the control unit 210 and the driving unit 220 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). Further, the driving unit 220 may be a concept further including a converter or the like that supplies DC power input to an inverter (not shown).

For example, when an inverter control unit (not shown) outputs a switching control signal (Sic in Fig. 4) of a pulse width modulation (PWM) method to an inverter (not shown), the inverter (not shown) It is possible to supply AC power of a predetermined frequency to the motor 230.

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

On the other hand, the control unit 210, on the basis of the current detector 220, the position signal (H) detected by the detected current (i _o) or position detection unit 235 from, it is possible to detect poryang. For example, while the washing tub 120 rotates, the laundry amount can be sensed based on the current value (i _o ) of the motor 230.

The control unit 210 may sense the amount of eccentricity of the washing tub 120, that is, the unbalance (UB) of the washing tub 120. [ Such eccentricity detection can be performed based on the ripple component of the current (i _o ) detected by the current detection unit 220 or the rotational speed variation amount of the washing tub 120.

4 is an internal circuit diagram of the driving unit of FIG.

The driving unit 220 according to the embodiment of the present invention includes a converter 410, an inverter 420, an inverter control unit 430, a dc voltage detection unit B, a smoothing capacitor C, And an output current detection unit E. 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 source 405 (v _s ) and the converter 410, and performs a power factor correcting or boosting operation. The reactor L may also function to limit the harmonic current due to the fast switching of the converter 410.

The input current detection section A can detect the input current (i _s ) input from the commercial AC power source 405. To this end, a current transformer (CT), a shunt resistor, or the like may be used as the input current detector A. The detected input current i _s can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The converter 410 converts the commercial AC power source 405, which has passed through the reactor L, into DC power and outputs the DC power. Although the commercial AC power source 405 is shown as a single-phase AC power source in the figure, it may be a three-phase AC power source. The internal structure of the converter 410 also changes depending on the type of the commercial AC power source 405.

Meanwhile, the converter 410 may include a diode without a switching element, and may perform a rectifying operation without a separate switching operation.

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

On the other hand, the converter 410 may be, for example, a half-bridge type converter in which two switching elements and four diodes are connected, 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, the boosting operation, the power factor correction, and the DC power conversion can be performed by the switching operation of the switching element.

The smoothing capacitor C smoothes the input power supply and stores it. In the drawing, one element is exemplified by the smoothing capacitor C, but a plurality of elements are provided so that the element stability can be ensured.

For example, when a direct current power from the solar cell is supplied to the smoothing capacitor C (not shown), the direct current power is supplied to the smoothing capacitor C It may be input directly or may be DC / DC converted and input. Hereinafter, the portions illustrated in the drawings are mainly described.

On the other hand, both ends of the smoothing capacitor C are referred to as a dc stage or a dc stage because the dc power source is stored.

The dc voltage detection unit B can detect the dc voltage Vdc at both ends of the smoothing capacitor C. [ For this purpose, the dc voltage detection unit B may include a resistance element, an amplifier, and the like. The detected dc voltage source Vdc can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The inverter 420 includes a plurality of inverter switching elements and converts the smoothed DC power supply Vdc into a three-phase AC power supply va, vb, vc having a predetermined frequency by on / off operation of the switching element, And outputs it to the synchronous motor 230.

The inverter 420 includes a pair of upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c serially connected to each other, The switching elements are connected to each other in parallel (Sa & S a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each switching element Sa, S'a, Sb, S'b, Sc, S'c.

The switching elements in the inverter 420 perform ON / OFF operations of the respective switching elements based on the inverter switching control signal Sic from the inverter controller 430. [ Thus, three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter control unit 430 can control the switching operation of the inverter 420. [ To this end, the drive controller 430, and can receive the output current (i _o) detected by the output current detector (E).

The inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. [ Inverter switching control signal (Sic) is output is generated by a switching control signal of a pulse width modulation (PWM), based on the output current (i _o) detected by the output current detector (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.

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

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

Three shunt resistors are placed between the inverter 420 and the synchronous motor 230 or the three lower arm switching elements S'a, S'b, S'c To be connected to each other. On the other hand, it is also possible to use two shunt resistors using three phase equilibrium. On the other hand, when one shunt resistor is used, the shunt resistor may be disposed between the capacitor C and the inverter 420 described above.

The detected output current (i _o) are, as discrete signals (discrete signal) of the pulse type, may be applied to the inverter controller 430, the inverter switching control signal (Sic) based on the detected output current (i _o) Is generated. In the output current detection (i _o) will now be described in that the three-phase output currents (ia, ib, ic) of the.

On the other hand, the three-phase motor 230 has a stator and a rotor, and each phase alternating current power of a predetermined frequency is applied to a coil of a stator of each phase (a, b, c) .

The motor 230 may be, for example, a Surface Mounted Permanent Magnet Synchronous Motor (SMPMSM), an Interior Permanent Magnet Synchronous Motor (IPMSM) A synchronous motor (Synchronous Reluctance Motor; Synrm), and the like. Among them, SMPMSM and IPMSM are permanent magnet applied Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by having no permanent magnet.

On the other hand, the inverter control unit 430 can control the switching operation of the switching element in the converter 410 when the converter 410 includes a switching element. For this purpose, the inverter control unit 430 can receive the input current (i _s ) detected by the input current detection unit (A). The inverter control unit 430 may output the converter switching control signal Scc to the converter 410 to control the switching operation of the converter 410. [ The converter switching control signal (Scc) is generated by a switching control signal of a pulse width modulation method (PWM), based on the input current (i _s) to be detected from the input current detecting unit (A) can be output.

Meanwhile, the position sensing unit 235 may sense the rotor position of the motor 230. For this, the position sensing unit 235 may include a Hall sensor. The sensed rotor position H is input to the inverter control unit 430 and used based on speed calculation and the like.

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

5, 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.

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

On the other hand, the axial conversion unit 510 can convert the two-phase current i?, I? Of the still coordinate system into the two-phase current id, iq of the rotational coordinate system.

)를 연산할 수 있다. 즉, 위치 신호에 기반하여, 시간에 대해, 나누면, 속도를 연산할 수 있게 된다.Based on the position signal H of the rotor input from the position sensing section 235, the speed calculating section 520 calculates the speed

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

)와 연산된 속도(

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

) And the calculated speed (

Can be output.

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

)와 속도 지령치(ω^* _r)의 차이에 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 section 530 generates the current command

(I ^* _q ) on the basis of the speed command value? ^* _R and the speed command value? ^* _R. For example, the current command generation unit 530 generates the current command

The PI controller 535 performs the PI control based on the difference between the speed command value? ^* _R and the speed command value? ^* _R , and generates the current command value i ^* _q . In the figure, the q-axis current command value (i ^* _q ) is exemplified by the current command value, but it is also possible to generate the d-axis current command value (i ^* _d ) unlike the figure. On the other hand, the value of the d-axis current command value i ^* _d may be set to zero.

On the other hand, the current command generation unit 530 may further include a limiter (not shown) for limiting the current command value i ^* _q so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 540 generates the voltage command generation unit 540 based on the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial conversion unit and the current command value based on ^{_{i * d, i * q)}} , and generates a d-axis, q-axis voltage command value ^{_{(v * d, v * q}} ). 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 ) It is possible to generate the axial voltage command value v ^* _q . Further, voltage command generation unit 540, on the basis of the difference between the d-axis current (i _d) and, the d-axis current command value (i ^* _d), and performs the PI control in the PI controller (548), d-axis voltage It is possible to generate the command value v ^* _d . The voltage command generator 540 may further include a limiter (not shown) for limiting the level of the d-axis and q-axis voltage command values v ^* _d and v ^* _q so as not to exceed the permissible range .

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

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis transforming unit 550 transforms the position computed by the velocity computing unit 520

) And the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ).

)가 사용될 수 있다.First, the axis converting unit 550 performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position computed by the speed calculator 520

) Can be used.

Then, the axis converting unit 550 performs conversion from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axial conversion unit 1050 outputs the three-phase output voltage instruction values v ^* a, v ^* b, v ^* c.

The switching control signal output unit 560 generates an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage set values v ^* a, v ^* b and v ^* c And outputs it.

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

In particular, with respect to the embodiment of the present invention, the waveform of the output voltage of the inverter includes an inverter switching control signal Sic for including a rising period, a first predetermined period, a falling period, and a second predetermined period, Can be generated and output.

In particular, an inverter switching control signal Sic is generated to include a rising section, a convex section, a first constant section, a falling section, a concave section, and a second predetermined section in which the waveform of the output voltage of the inverter rises Can be output.

In this way, the first constant interval and the second constant interval of the waveform of the output voltage of the inverter are symmetrically arranged, so that the cogging torque is reduced during the rotation of the motor. In addition, noise is reduced.

In addition, the temperature rise of each switching element in the inverter 420 can be reduced. This will be described in detail with reference to FIG. 6 and the following figures.

6 illustrates a waveform of the output voltage of the inverter according to an embodiment of the present invention.

Referring to the drawings, the waveform Va of the output voltage of the inverter illustrates the waveform of the output voltage outputted on a of the three phases (a, b, c).

Particularly, the waveform Va of the output voltage of the inverter can correspond to a pole voltage Vn which is a voltage between the a-phase and the neutral point N in the three phases a, b, and c.

Equation (1) below illustrates a pole voltage calculation method performed in the inverter control unit 430.

Here, Vdc represents the dc terminal voltage detected by the dc voltage detection unit B, and T represents the control cycle, that is, the unit cycle of the carrier signal for generating the PWM switching control signal. Ton represents on-time in the unit period T, that is, duty.

The inverter 420 controls the inverter output voltage waveform Va in accordance with the control of the switching control signal Sic from the inverter control unit 430 so that the output voltage rising period T1 and the first constant period T3 ), A falling period T4, and a second predetermined period T6.

On the other hand, the waveform Va of the output voltage of the inverter driven by the inverter control unit 430 controls the convex section T2 between the rising section T1 and the first predetermined section T3 and the falling section T4 ) And a second predetermined time interval (T6).

Here, the first predetermined period T3 and the second predetermined period T6 are preferably symmetrical. Particularly, the rising period T1, the convex period T2, the first constant period T3, the falling period T4, the concave period T5, and the second constant period T6 are set to 180 degrees , It can be symmetrical.

As described above, the first constant interval T3 and the second constant interval T6 are symmetrically arranged, so that the cogging torque is reduced during the rotation of the motor. In addition, noise is reduced.

The first predetermined period T3 and the second predetermined period T6 may be intervals corresponding to 60 degrees of electrical angle.

The peak value of the rising section T1 and the voltage level of the first predetermined section T3 are the same and the lower limit value of the falling section T4 and the voltage level of the second predetermined section T6 can be the same have.

Particularly, in the figure, the peak value Vp1 of the rising section T1, the peak value Vp1 of the convex section T2 and the voltage level Vp1 of the first constant section T3 are the same and the concave section T5 The lower limit value Vp2 of the falling period T4 and the voltage level Vp2 of the second constant period T6 are the same.

Referring to FIG. 6, when the peak values of the respective sections are equal to each other as shown in FIG. 6, the line-to-line voltage Vab or the line-to-line current appears as a sinusoidal waveform, as shown in FIG.

Figure 7 illustrates a line voltage waveform based on the waveform of the output voltage of the inverter of Figure 6;

Referring to the drawings, the line-to-line voltage Vab of the motor is shown in the form of a sine wave having a peak value of Vx and a lower limit of -Vx. As a result, the distortion of the line current can be reduced, and the vibration of the laundry processing apparatus can be suppressed.

Figures 8A and 8B illustrate inverter output voltage waveforms for comparison with Figure 6.

First, FIG. 8A illustrates an inverter output voltage waveform Va1 by a conventional two-phase pulse width modulation method.

When the motor is driven by the inverter output voltage waveform Va1 by the two-phase pulse width modulation method of Fig. 8A, compared with the inverter output voltage waveform Va2 by the three-phase pulse width modulation method of Fig. 8B, The switching loss is reduced to 2/3.

However, since the constant level section corresponding to the idle period appears only after 180 degrees of electric angle, the line voltage appears as an asymmetric voltage waveform.

Particularly, when the motor rotates at a low speed, the influence of a constant level section corresponding to the retainer is larger, so that a cogging torque is generated at the time of low-speed rotation of the motor. Then, since vibration occurs, the eccentricity amount detection and the like are affected.

In order to improve this point, the inverter output voltage waveform Va shown in Fig. 6 is used in the present invention.

6, the inverter 420 includes three pairs of switching elements each pairing the upper arm switching element and the lower arm switching element, and the output voltage is divided into a rising section T1, Three switching elements are turned on or off so as to be divided into one constant period T3, a falling period T4 and a second constant period T6, and the first constant period T3 and the second constant period T6 T6), all three switching elements can be turned off. That is, the first predetermined period T3 and the second predetermined period T6 may operate as a pause period.

Further, the inverter 420 may be configured such that the inverter output voltage is between the rising section T1 and the first predetermined section T3, and the convex section T2 between the falling section T4 and the second predetermined section T6, The three pairs of switching elements may be turned on or off so as to further include the concave section T5.

Next, FIG. 8B illustrates the inverter output voltage waveform Va2 by the conventional three-phase pulse width modulation method.

When the motor is driven by the inverter output voltage waveform Va2, the temperature suddenly rises at the switching element or the like at the time of high-speed rotation of the motor, and the stability of the element is affected.

To solve this problem, a two-phase pulse width modulation method as shown in Fig. 8A is used for high-speed rotation and a three-phase pulse width modulation method as shown in Fig. 8B is used for low- There is an inconvenience that the driving method should be divided. Further, the manufacturing cost is increased.

In order to solve this problem, in the present invention, regardless of the speed of the motor and regardless of the stroke period of the laundry processing apparatus, a constant output voltage waveform Va as shown in Fig. 6 is used.

That is, the inverter output voltage waveform Va is divided into a rising period T1, a convex period T2, a first predetermined period T3, a falling period T4, a concave period T5, a second predetermined period T6, .

Thereby, the motor can be stably driven by driving the motor with a constant output voltage waveform regardless of the motor speed or the stroke section. Further, the manufacturing cost is reduced.

6, the voltage levels of the first constant period T3 and the second constant period T6 may vary depending on the power supply level of the DC power source Vdc.

For example, the smaller the power supply level of the DC power supply Vdc, the smaller the peak value of the rising section T1 and the peak value of the convex section T2 than the voltage level of the first constant section T3, The lower limit value of the concave section T5 may be larger than the lower limit value of the falling section T4 and the voltage level of the second predetermined section T6. This will be described with reference to Figs. 9A to 9D.

9A to 9B illustrate a waveform of an output voltage of the inverter and a corresponding line-to-line voltage waveform according to another embodiment of the present invention.

The waveform (V'a) of the output voltage of the inverter of FIG. 9A illustrates a waveform based on the DC power source (Vdc) of 50%, as compared with the waveform (Va) of the output voltage of the inverter of FIG.

Accordingly, the waveform V'a of the output voltage of the inverter of FIG. 9A is similar to the waveform Va of the output voltage of the inverter of FIG. 6, but the voltage levels of the convex section T2 and the concave section T5 are There is a difference in the other.

That is, the peak value Vp4 of the convex section T2 is smaller than the peak value Vp3 of the rising section T1 and the voltage level Vp3 of the first constant section T3, The lower limit value Vp6 of the concave section T5 becomes larger than the voltage level Vp5 of the lower limit section Vp5 and the second constant section T6.

Accordingly, the line-to-line voltage waveform V'ab in Fig. 9B appears as a sinusoidal wave whose peak value is smaller than the line-to-line voltage waveform Vab in Fig. In the figure, it is exemplified that the peak value is Vy and the lower limit value is -Vy.

Next, FIGS. 9C to 9D illustrate the waveform of the output voltage of the inverter and the resulting line-to-line voltage waveform according to another embodiment of the present invention.

The waveform (V''a) of the output voltage of the inverter of FIG. 9C illustrates a waveform based on the DC power source (Vdc) of 30%, as compared with the waveform (Va) of the output voltage of the inverter of FIG.

Accordingly, the waveform (V''a) of the output voltage of the inverter of FIG. 9C is similar to the waveform (Va) of the output voltage of the inverter of FIG. 6, but the voltage level of the convex section T2 and the concave section T5 There is a difference in this other thing.

That is, the peak value Vp8 of the convex section T2 is smaller than the peak value Vp7 of the rising section T1 and the voltage level Vp7 of the first constant section T3, The lower limit value Vp10 of the concave section T5 is larger than the voltage level Vp9 of the lower limit section Vp9 and the second constant section T6.

9A, the peak value Vp8 of the convex section T2 is smaller than Vp4, and the lower limit value Vp10 of the concave section T5 is larger than Vp9.

Accordingly, the line voltage waveform V " ab in Fig. 9D appears as a sine wave having a smaller peak value than the line-to-line voltage waveform Vab in Fig. 7 and the line-to-line voltage waveform V'ab in Fig. 9B. In the figure, it is exemplified that the peak value is Vz and the lower limit value is -Vz.

FIG. 10 is a view showing an example of the motor rotation speed during the washing stroke of FIG.

Referring to the drawings, the washing cycle section of FIG. 10 may include a batch detection section Ta, an eccentricity detection section Tb, a first washing section Tc, and a second washing section Td.

The detection period Ta is a section for sensing the amount of the laundry in the washing tub 120. The laundry detection period Ta is a period in which the laundry is detected by the forward rotation or reverse rotation at the first rotation speed v1 or the repetitive stirring rotation in the forward and reverse directions . Specifically, it is possible to detect the amount of discharged fuel based on the output current (i _o ) value of the motor 230 or the ripple of the output current (i _o ).

On the other hand, a bubble dispersion section (not shown) for dispersing the bubble in the washing tub 120 may be further performed before the blooming detection section Ta. The bubble dispersion section (not shown) can disperse the bubbles by forward rotation or reverse rotation at a speed lower than the first rotation speed v1 or by repetitive agitation rotation in forward and reverse directions.

The eccentricity sensing section Tb senses the amount of eccentricity UB in the washing tub 120 and rotates the washing tub 120 at the second rotational speed v2 to detect the amount of eccentricity. Specifically, the amount of eccentricity can be detected based on the output current (i _o ) value of the motor 230 or the ripple of the output current (i _o ).

The first washing section Tc and the second washing section Td are arranged such that when the amount of eccentricity sensed in the eccentricity sensing section Tb is less than an allowable value, It can be rotated at the speed v4. In the state where the water supply is performed before the first washing section Tc and the second washing section Td, laundry detergent or the like may be put into the washing tub 120 to perform washing. Multiplication can be performed after completion.

6 (a) and 6 (b), irrespective of the volume detection period Ta, the eccentricity detection period Tb, the first washing period Tc, and the second washing period Td, The first period T3, the second period T4, the second period T5 and the second period T6, as shown in FIG. 9A, FIG. 9A, It is preferable to apply the inverter output voltage waveform to the motor 230.

Thus, by driving the motor with a constant output voltage waveform irrespective of the motor speed or the stroke section, the motor can be stably driven without cogging torque. Further, the manufacturing cost is reduced.

Fig. 11 is a view showing an example of the motor rotation speed during the dehydration stroke in Fig. 9. Fig.

Referring to FIG. 11, the dehydration stroke section of FIG. 11 includes a lotion sensing section Tl, a first eccentricity sensing section Tm, a first dehydrating section Tn, a second eccentricity sensing section To, (Tp), a third eccentricity sensing interval (Tq), and a third dehydration interval (Tr).

The swallowing detection period Tl is a section for detecting the swelling amount in the washing tub 120. The sweeping detecting period Tl detects the swelling amount by rotating the washing tub in the forward rotation direction or the backward direction at the first rotation speed v1, . Specifically, it is possible to detect the amount of discharged fuel based on the output current (i _o ) value of the motor 230 or the ripple of the output current (i _o ).

On the other hand, it is possible to further perform a gun dispersing section (not shown) for dispersing the can in the washing tub 120 before the replenishment detecting section Tl. The bubble dispersion section (not shown) can disperse the bubbles by forward rotation or reverse rotation at a speed lower than the first rotation speed v1 or by repetitive agitation rotation in forward and reverse directions.

The first to third eccentricity sensing sections Tm, To and Tq are sections for sensing the amount of eccentricity UB in the washing tub 120. The first to third eccentricity sensing sections Tm, To, and Tq are rotations of the washing tub 120 at the second rotational speed v2, Lt; / RTI > Specifically, the amount of eccentricity can be detected based on the output current (i _o ) value of the motor 230 or the ripple of the output current (i _o ).

When the amount of eccentricity sensed by the first to third eccentricity sensing sections Tm, To, and Tq is equal to or less than an allowable value, the first to third dehydrating sections Tn, Tp, Fifth, and fifth rotational speeds v3, v4, v5). In the state where the water supply is performed before the first dewatering period Tn, dehydration is performed, and drainage can be performed in the middle thereof.

According to an embodiment of the present invention, a volume sensing period Tl, a first eccentricity sensing period Tm, a first dehydrating interval Tn, a second eccentricity sensing interval To, The rising section T1, the convex section T2 and the third rising section Tp as shown in FIG. 6, 9A, or 9B, regardless of the section Tp, the third eccentricity sensing section Tq, It is preferable that the inverter output voltage waveform having one fixed period T3, a falling period T4, a concave period T5 and a second constant period T6 is applied to the motor 230. [

Thus, by driving the motor with a constant output voltage waveform irrespective of the motor speed or the stroke section, the motor can be stably driven without cogging torque. Further, the manufacturing cost is reduced.

12 is a perspective view illustrating a laundry processing apparatus according to another embodiment of the present invention.

Referring to the drawings, the laundry processing apparatus 1100 of FIG. 12 is a front load system as compared with the top load system of FIG.

The laundry processing apparatus 1100 includes a cabinet 1110 forming an outer appearance of the laundry processing apparatus 1100, a tub 1120 disposed inside the cabinet 1110 and supported by the cabinet 1110, A motor 1130 for driving the drum 1122 and a washing water supply unit 1110 disposed outside the cabinet body 1111 and supplying washing water to the inside of the cabinet 1110, (Not shown), and a drain device (not shown) formed below the tub 1120 to discharge washing water to the outside.

A plurality of through holes 1122A are formed in the drum 1122 so as to allow the washing water to pass therethrough. The laundry 1122 is lifted up to a certain height during rotation of the drum 1122, (1124) may be disposed.

The cabinet 1110 includes a cabinet body 1111 and a cabinet cover 1112 disposed on the front surface of the cabinet body 1111 and coupled to the cabinet body 1111. The cabinet 1111 is disposed above the cabinet cover 1112, And a top plate 1116 disposed above the control panel 1115 and coupled with the cabinet body 1111. The cabinet 1111 includes a top plate 1116,

The cabinet cover 1112 includes a catch and release hole 1114 formed so as to allow the capsule to move in and out and a door 1113 arranged to be pivotable in the left and right direction so as to be able to open and close the catch and release hole 1114.

The control panel 1115 includes operation keys 1117 for operating the laundry processing apparatus 1100 and a display 1118 disposed at one side of the operation keys 1117 and for displaying the operating state of the laundry processing apparatus 1100 ).

The control unit 1115 electrically connects the operation keys 1117 and the display unit 1118 to a control unit (not shown) and electrically controls each component of the laundry processing apparatus 1100 do.

12, when the motor 1130 that rotates the drum 1122 is driven, similar to the laundry processing apparatus 100 of FIG. 1 described above, regardless of the speed or the stroke section of the motor, A rising period T1, a convex period T2, a first predetermined period T3, a falling period T4, a concave period T5, a second predetermined period T6, and a second predetermined period T6 as shown in FIG. 6, FIG. 9A, To be applied to the motor 1130. In this case,

Thus, by driving the motor with a constant output voltage waveform irrespective of the motor speed or the stroke section, the motor can be stably driven without cogging torque. Further, the manufacturing cost is reduced.

The laundry processing apparatus according to the embodiment of the present invention can be applied to all or some of the embodiments so that various modifications can be made to the embodiments and the methods of the embodiments described above, May be selectively combined.

Meanwhile, the method of operating the laundry processing apparatus of the present invention can be implemented as a processor-readable code on a recording medium readable by a processor included in the laundry processing apparatus. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

Claims (15)

A washing tub;
A motor for rotating the washing tub; And
And a driving unit for driving the motor,
The driving unit includes:
An inverter for converting a predetermined DC power source into an AC power source of a predetermined frequency and outputting the AC power source to the motor;
And an inverter control unit for controlling the inverter,
Wherein the waveform of the output voltage of the inverter driven by the control of the inverter control unit,
A rising section, a rising section, a falling section, and a second predetermined section for increasing the output voltage of the washing machine. The method according to claim 1,
Wherein the waveform of the output voltage of the inverter driven by the control of the inverter control unit,
A convex section between the rising section and the first predetermined section, and a concave section between the falling section and the second predetermined section. The method according to claim 1,
Wherein the first and second predetermined sections are sections corresponding to an electrical angle of 60 degrees. The method according to claim 1,
Wherein the voltage levels of the first and second predetermined intervals are varied according to a power supply level of the DC power supply. 3. The method of claim 2,
The rising section, the convex section, the first predetermined section,
Wherein the falling section, the concave section, and the second predetermined section are symmetrical with respect to an electrical angle of 180 degrees. The method according to claim 1,
The peak value of the rising section and the voltage level of the first predetermined section are the same,
Wherein the lower limit value of the falling period and the voltage level of the second predetermined period are the same. 3. The method of claim 2,
The peak value of the rising section, the peak value of the convex section, and the voltage level of the first predetermined section are the same,
Wherein the lower limit value of the falling section, the lower limit value of the falling section, and the voltage level of the second predetermined section are the same. 3. The method of claim 2,
As the power supply level of the DC power supply becomes smaller,
The peak value of the rising section and the peak value of the convex section become smaller than the voltage level of the first predetermined section,
The lower limit value of the recess section is larger than the lower limit value of the falling section and the voltage level of the second predetermined section. 3. The method of claim 2,
Wherein the rising section, the convex section, the first constant section, the falling section, the concave section, and the second constant section in the waveform of the output voltage of the inverter are constant regardless of the speed or the stroke section of the motor A laundry processing device characterized by. The method according to claim 1,
The driving unit includes:
And an output current detector for detecting an output current flowing in the motor,
The inverter control unit includes:
And controls the inverter to drive the motor with the waveform of the output voltage of the inverter based on the output current. 11. The method of claim 10,
The driving unit includes:
And a position detector for detecting a rotor position of the motor,
Wherein the inverter control unit controls the inverter based on the detected rotor position and the output current. The method according to claim 1,
The inverter includes:
And three pairs of switching elements each pairing the upper arm switching element and the lower arm switching element,
And the three pairs of switching elements are turned off during the first predetermined period and the second predetermined period. The method according to claim 1,
Wherein a three-phase sine wave current of the motor flows according to a waveform of an output voltage of the inverter. A washing tub;
A motor for rotating the washing tub; And
And three pairs of switching elements each pairing the upper arm switching element and the lower arm switching element so that the output voltage is divided into a rising section, a first predetermined section, a falling section, and a second predetermined section, And an inverter for turning on or off the elements and for turning off the three pairs of switching elements for the first predetermined period and the second predetermined period. 15. The method of claim 14,
The inverter includes:
Turning on or off the three pairs of switching elements so that the inverter output voltage further includes a convex section between the rising section and the first section and a concave section between the falling section and the second section Wherein the washing machine is a washing machine.

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