KR20170087271A - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus. The motor driving apparatus according to an embodiment of the present invention includes at least one capacitor connected to a dc stage, and a plurality of high-to-low switching elements and a low-arm switching element. By the switching operation, the dc- An inverter for converting the converted AC power to a plurality of motors, and an inverter control unit for controlling the inverter. Accordingly, a plurality of motors can be controlled by using one inverter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor driving apparatus and a home appliance having the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus, and more particularly, to a motor driving apparatus and a home appliance having the motor driving apparatus.

The motor driving apparatus is an apparatus for driving a motor having a rotor for rotating and a stator for winding a coil.

On the other hand, the motor drive apparatus can be classified into a sensor-driven motor drive apparatus using sensors and a sensorless motor drive apparatus without sensor.

Recently, a capacitorless motor drive device using a capacitor of a low capacity has been widely used for reasons of reduction in manufacturing cost and the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor driving apparatus capable of controlling a plurality of motors by using one inverter and a home appliance having the motor driving apparatus.

According to an aspect of the present invention, there is provided a motor driving apparatus including at least one capacitor connected to a dc stage, a plurality of sag lock switches and a lower arm switching device, An inverter for converting a DC power source to an AC power source and outputting the converted AC power source to a plurality of motors, and an inverter control unit for controlling the inverter.

According to an aspect of the present invention, there is provided a home appliance including at least one capacitor connected to a dc stage, a plurality of sag-lock switching elements and a lower arm switching element, An inverter for converting a DC power source of the inverter to an AC power source and outputting the converted AC power to a plurality of motors, and an inverter control unit for controlling the inverter.

According to an embodiment of the present invention, a motor driving apparatus and a home appliance having the motor driving apparatus include at least one capacitor connected to a dc stage, a plurality of sag lock switching elements and a lower arm switching element, An inverter for converting a direct current power source into an alternating current power source and outputting the converted alternating current power source to a plurality of motors and an inverter control unit for controlling the inverter so that a plurality of motors can be controlled by using one inverter .

On the other hand, the first motor of the plurality of motors is started and operated first, and the second motor is controlled to start and operate after the first motor starts, so that the peak current due to the motor start can be dispersed.

On the other hand, the first motor of the plurality of motors is controlled to continuously operate, and the second motor is controlled to operate intermittently, so that the power consumption due to the plurality of motors can be dispersed.

On the other hand, when a plurality of motors are started, it is possible to prevent the overshoot of the current in the transient state by controlling the currents flowing in the motors to increase sequentially. Therefore, it is possible to stably perform the motor drive, for example, the likelihood of burnout of the circuit element in the motor drive apparatus is lowered.

1 is a perspective view illustrating a laundry processing apparatus, which is an example of a home appliance according to an embodiment of the present invention.
2 is an internal block diagram of the laundry processing apparatus of FIG.
Figs. 3A to 3B illustrate various examples of the driving unit of Fig.
4 illustrates an example of an internal circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
5 is an internal block diagram of the inverter control unit of FIG.
6 to 9 illustrate various examples of the internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.
10A to 10B are diagrams illustrating current waveforms when the motor is driven.
11 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.
12 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.
13 is a perspective view illustrating a dryer, which is another example of a home appliance according to an 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.

The motor drive apparatus described in this specification is a motor drive apparatus capable of driving a plurality of inverters.

Meanwhile, the motor driving apparatus 220 according to the embodiment of the present invention may also be referred to as a motor driving unit or a driving unit.

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

Referring to the drawings, the laundry processing apparatus 100a according to an embodiment of the present invention may be a laundry processing apparatus including a drying function.

The laundry processing apparatus 100a of FIG. 1 is a front load type laundry processing apparatus in which the bag is inserted into the washing tub in the front direction. Such a front type laundry processing apparatus is a concept including a washing machine in which a bag is inserted and performing washing, rinsing and dewatering, or a dryer in which a cloth is inserted to perform drying, and the following description will be focused on a washing machine.

The laundry processing apparatus 100a of FIG. 1 includes a cabinet 110 that forms an outer appearance of the laundry processing apparatus 100a, a laundry processing apparatus 100a disposed inside the cabinet 110 and supported by the cabinet 110, A motor 130 for driving the washing tub 122 and a cabinet 110 disposed outside the cabinet main body 111. The washing tub 122 is disposed inside the cabinet 110, (Not shown) for supplying washing water to the inside of the tub 120 and a drain (not shown) for discharging washing water to the outside.

A plurality of through holes 122A are formed in the washing tub 122 so as to allow washing water to pass therethrough. The washing tub 122 is lifted up to a predetermined height during the rotation of the washing tub 122, (124) may be disposed.

The cabinet 110 includes a cabinet body 111 and a cabinet cover 112 disposed on the front surface of the cabinet body 111 and coupled to the cabinet body 111. The cabinet 110 is disposed above the cabinet cover 112, And a top plate 116 disposed on the control panel 115 and coupled to the cabinet main body 111. The cabinet main body 111 includes a top plate 116,

The cabinet cover 112 includes a catch and release hole 114 formed so as to be able to move in and out of the can and a door 113 arranged to be rotatable in the left and right direction so that the catch and release hole 114 can be opened and closed.

The control panel 115 is provided with operation keys 117 for operating the laundry processing apparatus 100a and a display device (not shown) disposed at one side of the operation keys 117 and for displaying the operation state of the laundry processing apparatus 100a 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 a control unit (not shown) electrically controls each component of the laundry processing apparatus 100a do. The operation of the control unit (not shown) will be described later.

On the other hand, the washing tub 122 may be provided with autobalance (not shown). The autobalance (not shown) is for reducing vibrations caused by the amount of eccentricity of the laundry contained in the washing tub 122, and can be realized by liquid balance, ball balance, or the like.

The laundry processing apparatus 100a may further include a vibration sensor for measuring the vibration amount of the washing tub 122 or the vibration amount of the cabinet 110 although not shown in the drawing.

(Not shown), a condenser (not shown), an evaporator (not shown), a fan (not shown), and a fan motor (Not shown), and the like.

For the drying function, the compressor of the laundry processing apparatus 100a compresses the fluid, and the compressed fluid is heat-exchanged in the condenser and the evaporator, and the operation of the fan and the fan motor causes the inside of the washing tub 122 , Warm wind is blowing. Thus, the laundry can be dried in the washing tub 122.

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

Referring to the drawings, in the laundry processing apparatus 100a, the driving unit 220 is controlled by a control operation of the control unit 210, and the driving unit 220 can drive the plurality of motors 230.

For example, the driving unit 220 includes a motor 230 for rotating the washing tub 122, a second motor 230b serving as a drain motor for drainage operation, a third motor The second motor 230c, and the fourth motor 230d, which is a compression motor for compressing during drying.

The manner in which the driving unit 220 drives the plurality of motors 230 will be described with reference to FIG. 3A and the following figures.

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.

Also, the control unit 210 can control the display 18 to display the washing course, the washing time, the dehydration time, the rinsing time, or the current operation state.

Meanwhile, the control unit 210 controls the driving unit 220 so that the driving unit 220 controls the motor 230 to operate. At this time, the position sensing unit for sensing the rotor position of the motor may not be provided inside or outside the motor 230. That is, the driving unit 220 can control the motor 230 by a sensorless method.

The drive unit 220 drives the motor 230 and includes an inverter (not shown) and an inverter control unit (not shown), an output current detection unit (not shown) that detects an output current flowing to the motor 230, And an output voltage detection unit (not shown) for detecting the output voltage vo applied to the motor 230. [ 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, the inverter control unit (430 in Fig. 4) in the driving unit 220 can estimate the rotor position of the motor 230 based on the output current idc or io or the output voltage vo. Then, based on the estimated rotor position, the motor 230 is controlled to rotate.

Specifically, the inverter control unit 430 of FIG. 4 sets the switching control signal (Sicb, Sicc in FIG. 4) of the pulse width modulation (PWM) system based on the output current idc or io or the output voltage vo The inverter (not shown) performs a high-speed switching operation, and can supply the alternating-current power of a predetermined frequency to the motor 230. [0050] Fig. Then, the motor 230 can be rotated by an AC power source of a predetermined frequency.

On the other hand, the control unit 210 can detect the amount of discharged fluid based on the output current idc or io flowing to the motor 230 or the like. For example, while the washing tub 122 rotates, the laundry amount can be sensed based on the output current idc or io of the motor 230.

In particular, the control unit 210 can accurately detect the amount of the battery pack using the stator resistance and the inductance value of the motor measured in the motor alignment interval when the battery pack is detected.

Meanwhile, the controller 210 may sense the amount of eccentricity of the washing tub 122, that is, the unbalance (UB) of the washing tub 122. This eccentricity sensing can be performed based on the ripple component of the output current idc or io flowing to the motor 230 or the rotational speed variation of the washing tub 122. [

In particular, the controller 210 can accurately detect the amount of eccentricity by using the stator resistance and the inductance value of the motor measured in the motor alignment interval at the time of detecting the amount of discharged fluid.

Figs. 3A to 3B illustrate various examples of the driving unit of Fig.

3A shows an example of a motor driving device 220x for driving a plurality of motors 230, 230b, 230c and 230d.

Referring to the drawing, an input AC power source 405 is converted to DC power by a converter 410 such as a rectifying part, and DC power is stored in a dc-stage capacitor C1 disposed at both ends of a dc stage (a-b stage).

a first inverter 420a for driving a motor 230 for driving the washing tub 122, a voltage step-down unit 412 for stepping down a dc step voltage such as an SMPS, A third inverter 420c for driving the fan motor 230c for driving the compressor and a fourth inverter 420d for driving the compressor motor 230d for driving the compressor can be connected in parallel.

On the other hand, the second inverter 420b for driving the drain motor 230 for operating the drain pump can operate using the voltage from the voltage step-down unit 412.

As shown in FIG. 3A, the motor driving apparatus 220x uses four inverters 420a to 420d to drive the plurality of motors 230, 230b, 230c and 230d.

According to the motor driving apparatus 220x of FIG. 3A, as the number of inverters increases in proportion to the number of motors, space limitation and cost increase can occur.

Next, FIG. 3B shows an example of a motor driving device 220y for driving the plurality of motors 230b and 230c.

3A, a converter 410, an inverter 420c, and the like are used to drive the third motor 230c. In order to drive the second motor 230b, 3A, the voltage step-down unit 412 and the inverter 420b are used.

On the other hand, the inverter control unit 430c controls the inverter 420c, and the second inverter control unit 430b controls the inverter 420b.

According to the motor driving device 220y of FIG. 3B, an inverter control unit is required according to the number of inverters, and space limitation and cost increase can be caused by an increase in the number of inverter control units.

Accordingly, the present invention proposes a method capable of saving space, cost, and the like when driving a plurality of motors. This will be described with reference to Figs. 4 to 9. Fig.

4 illustrates an example of an internal circuit diagram of a motor driving apparatus according to an embodiment of the present invention.

4, the motor driving apparatus 220a includes at least one capacitor Ca and Cb connected to a dc stage (ab stage), a plurality of sag lock switching devices and a lower arm switching device, An inverter 420 for converting a DC power source of the dc stage into an AC power source and outputting the converted AC power source to a plurality of motors by an operation and an inverter control unit 430 for controlling the inverter 420 .

4 may further include a converter 410 for converting the input AC power source 405, v _s to DC power.

4 includes a first output current detection unit Rdc connected to the dc stage and detecting an output current, a second output current detection unit Rdc connected to the dc stage, And second and third output current detection units Rb and Rc connected to one ends of the switching elements to detect an output current.

The inverter 420 includes three-phase upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c. The inverter 420 uses three phase upper arm switching elements and lower arm switching elements The first motor 230c of the plurality of motors is driven so as to drive the first motor 230c of the plurality of motors so that one phase of the three-phase upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, The second motor 230a of the plurality of motors can be driven by using the element and the lower arm switching element.

Here, the first motor and the second motor may be any one of a motor 230 for rotating the washing tub, a drain motor 230b, a fan motor 230c, and a compressor motor 230d described in FIG. 2 .

Hereinafter, it is assumed that the first motor is a drain motor 230b and the second motor is a fan motor 230c.

The first dc-stage capacitor Ca and the second dc-stage capacitor Cb are arranged at the dc stage and the inverter 420 is connected to the three-phase dummy stage switching devices Sa, Sb and Sc and the bottom- 'a, S'b, S'c).

At this time, the first motor 230a of the plurality of motors is connected to each node n2 (Sa, Sb, S'c) between the three-phase upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, , n3.

On the other hand, the second motor 230b of the plurality of motors is connected to the dc terminal node ndc between the first dc terminal Ca and the second dc terminal capacitor Cb and the dc terminal node ndc between the first dc terminal Ca and the second dc terminal capacitor Cb, Can be connected to the first node (n1) between the upper arm switching element and the lower arm switching element of one phase of the elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c.

That is, the second motor 230b may be connected between the dc node ndc and the first node n1.

According to this motor arrangement, the first motor 230c operates by the switching operation of the three-phase switching elements Sa, Sb, Sc, S'a, S'b and S'c in the inverter 420, 2 motor 230b are operated by the switching operation of the one-phase switching elements Sa and S'a in the inverter 420. [

On the other hand, the inverter control unit 430 can generate and output the switching control signal Sicc for driving the first motor 230c, which is a fan motor among a plurality of motors, and drives the second motor 230b as a drain motor It is possible to generate and output the switching control signal Sicb. A plurality of switching control signals can be outputted through one inverter control section, so that space reduction and manufacturing cost can be reduced.

On the other hand, the inverter control unit 430 starts and operates the first motor 230c, which is a fan motor, and drives the second motor 230b, which is a drain motor, after starting the first motor 230c, which is a fan motor, Can be controlled. Thus, the peak current due to the motor start can be dispersed.

On the other hand, the inverter control unit 430 controls the first motor 230c, which is a fan motor among the plurality of motors, to continuously operate, and the second motor 230b, which is a drain motor, can be controlled to operate intermittently. Thus, it is possible to disperse the power consumption according to a plurality of motor operations.

On the other hand, the inverter control unit 430 can prevent overshoot of the current in the transient state by controlling the currents flowing through the motor to increase sequentially when a plurality of motors are started. Therefore, it is possible to stably perform the motor drive, for example, the likelihood of burnout of the circuit element in the motor drive apparatus is lowered.

On the other hand, the inverter control unit 430 determines whether or not the voltage of the first dc short capacitor Ca and the voltage of the second dc short capacitor Cb are equal to each other, based on the dc terminal voltage detected by the dc short voltage detector (not shown) It can be controlled to maintain equilibrium.

To this end, the dc terminal voltage detecting unit (not shown) includes a first dc terminal voltage detecting unit (not shown) for detecting the voltage of the first dc terminal capacitor Ca and a second dc terminal voltage detecting unit And a second dc voltage detecting unit (not shown).

4, the first motor may be a motor 230 for rotating the washing machine, and the second motor may be a drain motor 230b or a fan motor 230c or a compressor motor 230d.

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

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 signals Sicb and Sicc from the inverter controller 430. [ As a result, an AC power source having a predetermined frequency is output to the motor 230b or 230c.

The inverter control unit 430 can control the switching operation of the inverter 420 based on the sensorless method. To this end, the inverter control unit 430 may receive the output current idc detected by the output current detection unit E.

The inverter control unit 430 outputs the inverter switching control signals Sicb and Sicc to the inverter 420 to control the switching operation of the inverter 420. [ The inverter switching control signals Sicb and Sicc are switching control signals of the pulse width modulation method PWM and output currents idc or Io detected by the first to third output current detection sections Rdc, Can be generated and output as a basis.

Detailed operation of the inverter switching control signals Sicb and Sicc in the inverter control unit 430 will be described later with reference to FIG.

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 output current idc or io detected by the first to third output current detection sections Rdc, Rb and Rc is input to the inverter control section 430 and is calculated as the output currents ioa, .

The axis converting unit 510 converts the output currents ioa, ib, ic detected by the first to third output current detecting units Rdc, Rb and Rc into the two-phase currents iα and iβ of the stationary coordinate system can do.

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 추정하고, 추정된 위치를 미분하여, 속도(

)를 연산할 수 있다. Based on the output currents (ia, ib, ic) detected by the output current detection section (E), the speed calculation section (520)

), Differentiates the estimated position,

) Can be calculated.

)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(335)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 335 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.

On the other hand, when the motor 230 is a surface permanent magnet synchronous motor (SPMSM) having no rotary polarity, that is, a symmetric type, generation of a current command value and the like for the d axis may be omitted.

On the other hand, when the motor 230 is an Interior Permanent Magnet Synchronous Motor (IPMSM) having a rotary polarity, that is, an asymmetric type, unlike the drawing, a current command value, etc. for the d axis may be generated.

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 344 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 (348), 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.

Switching control signal output unit 560, three-phase output voltage command value (v ^* a, v ^* b, v ^* c) to a pulse width modulation (PWM) inverter switching control signal (Sicb, Sicc) according to the method based on the And outputs it.

The output inverter switching control signals Sicb and Sicc can be converted into a gate driving signal in a gate driver (not shown) and input to the gates of the switching elements 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 this way, by generating a plurality of inverter switching control signals through one inverter control unit 430, space reduction and manufacturing cost reduction can be achieved.

6 to 9 illustrate various examples of the internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.

6 illustrates another internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.

Referring to the drawing, the motor driving apparatus 220b of FIG. 6 is similar to the motor driving apparatus 220a of FIG. 4, except that the first motor 230c is driven in two phases rather than three-phase driving.

Hereinafter, the differences will be mainly described.

The inverter 420 in the motor driving apparatus 220b of Fig. 6 includes three-phase upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c, (Sb, Sc) and lower-arm switching elements (S'b, S'c) of the three-phase sagittal switching element and the lower arm switching element (S'a, S'b, S'c) The first motor 230c of the plurality of motors is driven and the three-phase upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c, The second motor 230b of the plurality of motors is driven by using the low-side switching element Sa and the low-arm switching element S'a.

The first motor 230c of the plurality of motors is connected between the three phase upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c in the inverter 420, And is connected to the second node n2 and the third node n3 between the upper arm switching element and the lower arm switching element.

On the other hand, the second motor 230b of the plurality of motors is connected to the dc terminal node ndc between the first dc terminal Ca and the second dc terminal capacitor Cb and the dc terminal node ndc between the first dc terminal Ca and the second dc terminal capacitor Cb, Is connected to the first node (n1) between the upper arm switching element and the lower arm switching element of one phase of the elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c.

On the other hand, the inverter control unit 430 can generate and output the switching control signal Sicc for driving the first motor 230c, which is a fan motor among a plurality of motors, and drives the second motor 230b as a drain motor It is possible to generate and output the switching control signal Sicb.

7 illustrates another internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.

7, the motor driving apparatus 220c is similar to the motor driving apparatus 220a of FIG. 4 except that three motors 230a, 230b and 230c are connected to the inverter 420 and driven There is a difference.

Hereinafter, the differences will be mainly described.

The inverter 420 of the motor driving apparatus 220c of Fig. 7 is constituted by three phases of the upper arc-shaped switching elements Sa, Sb and Sc and the lower arm switching elements S'a, S'b and S'c, The first motor 230a of the plurality of motors is driven by using the switching element Sa and the lower arm switching element S'a to drive the three-phase upper arm switching elements Sa, Sb and Sc and the lower arm switching elements S the second motor 230b of the plurality of motors is driven by using the upper arm switching element Sb and the lower arm switching element S'b of the other phases of the three phases A, S'b, S'c, And the lower arm switching element Sc and the lower arm switching element S'c of the upper arm switching elements Sa, Sb and Sc and the lower arm switching elements S'a, S'b and S'c, So that the third motor 230c of the plurality of motors can be driven.

To this end, the first motor 230a of the plurality of motors includes a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb, a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb, The first node Sb between the upper arm switching element Sa and the lower arm switching element S'a among the switching elements Sa, Sb and Sc and the lower arm switching elements S'a, S'b and S'c, (n1).

The second motor 230b of the plurality of motors includes a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb and a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb, The second node Sb between the upper arm switching element Sb and the lower arm switching element S'b among the elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, (n2).

The third motor among the plurality of motors includes a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb and a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb, The third node n3 between the upper arm switching element Sc and the lower arm switching element S'c among the lower arm switching elements S'a, S'b and S'c among the lower arm switching elements Sc, Lt; / RTI >

On the other hand, the inverter control unit 430 can generate and output the first to third switching control signals Sica to Sicc for driving the first to third motors 230a to 230c, which are fan motors among a plurality of motors. have.

Fig. 8 illustrates another internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.

8, the motor driving apparatus 220d shown in FIG. 8 is similar to the motor driving apparatus 220c shown in FIG. 7 except that the inverter 420 includes three-phase switching elements Sa to Sc, S'a to S'c Phase switching elements Sa to Sf, S'a to S'f, instead of having six-phase switching elements Sa and Sf.

Hereinafter, the differences will be mainly described.

The inverter 420 of FIG. 8 includes six-phase upper arm switching elements Sa to Sf and lower arm switching elements S'a to S'f. The six-phase upper arm switching elements Sa to Sf and the lower arm switching elements S'a to S'f, The first motor 230a of the plurality of motors is driven by using the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b of the two phases S'a to S'f, S'c and S'd (S'c, S'd) of the other two phases of the six-phase upper arm switching elements Sa to Sf and lower arm switching elements S'a to S'f, The second motor 230b of the plurality of motors is driven so that the upper arm switch elements Sa to Sf and the lower arm switching elements S'a to S'f of the six phases, The third motor 230b of the plurality of motors can be driven by using the switching elements Se and Sf and the lower arm switching elements S'e and S'f.

To this end, the first motor 230a of the plurality of motors is connected between the upper arm switching elements Sa to Sf and the lower arm switching elements S'a to S'f of the six phases in the inverter 420, To the first node n1 and the second node n2 between the first and second switch elements Sa and Sb and the lower arm switching elements S'a and S'b.

On the other hand, the second motor 230b of the plurality of motors is connected between the upper arm switching elements Sa to Sf and the lower arm switching elements S'a to S'f of the six phases in the inverter 420, To the third node n3 and the fourth node n4 between the first and second switch elements Sc and Sd and the lower arm switching elements S'c and S'd.

On the other hand, the third motor among the plurality of motors is connected to the upper arm switching elements Se and Sf of the six phases of the upper arm switching elements Sa to Sf and the lower arm switching elements S'a to S'f in the inverter 420, Sf) and the fifth node (n5) and the sixth node (n6) between the lower arm switching (S'e, S'f) elements.

On the other hand, the inverter control unit 430 can generate and output the first to third switching control signals Sica to Sicc for driving the first to third motors 230a to 230c, which are fan motors among a plurality of motors. have.

FIG. 9 illustrates another internal circuit diagram of the motor driving apparatus according to the embodiment of the present invention.

Referring to the drawings, the motor driving apparatus 220e of FIG. 9 is similar to the motor driving apparatus 220d of FIG. 8, except that the motors are three-phase drives, not two-phase drives.

Hereinafter, the differences will be mainly described.

The inverter 420 of FIG. 9 includes six-phase upper-arm switching elements Sa to Sf and lower-arm switching elements S'a to S'f, and six-phase upper-arm switching elements Sa to Sf and a lower- The first motor 230a of the plurality of motors is driven by using the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b of the two phases S'a to S'f, S'c and S'd (S'c, S'd) of the other two phases of the six-phase upper arm switching elements Sa to Sf and lower arm switching elements S'a to S'f, The second motor 230b of the plurality of motors is driven so that the upper arm switch elements Sa to Sf and the lower arm switching elements S'a to S'f of the six phases, The third motor 230b of the plurality of motors can be driven by using the switching elements Se and Sf and the lower arm switching elements S'e and S'f.

The first motor 230a of the plurality of motors is connected to the dc node ndc between the first dc capacitor Ca and the second dc capacitor Cb and the dc node ndc between the first dc capacitor Ca and the second dc capacitor Cb, A first node between the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b among the elements Sa to Sf and the lower arm switching elements S'a to S'f n1 and the second node n2.

The second motor 230b of the plurality of motors is connected to the dc node ndc between the first dc capacitor Ca and the second dc capacitor Cb and the dc node ndc between the first dc capacitor Ca and the second dc capacitor Cb, The third node between the upper arm switching elements Sc and Sd and the lower arm switching elements S'c and S'd of the other two phases among the elements Sa to Sf and the lower arm switching elements S'a to S'f, (n3) and the fourth node (n4).

The third motor among the plurality of motors includes a dc stage node ndc between the first dc stage capacitor Ca and the second dc stage capacitor Cb and a dc stage node ndc between the dc stage switching device Sa And the fifth node n5 between the upper arm switching elements Se and Sf and the lower arm switching elements S'e and S'f among the lower arm switching elements S'a to S'f, And the sixth node n6.

On the other hand, the inverter control unit 430 can generate and output the first to third switching control signals Sica to Sicc for driving the first to third motors 230a to 230c, which are fan motors among a plurality of motors. have.

Meanwhile, the first to third motors 230a, 230b, and 230c of FIGS. 7 to 9 may correspond to any one of the motor for rotating the washing tub, the drain motor, the fan motor, and the compressor motor.

Meanwhile, the motor driving apparatuses 220a to 220e of FIGS. 4 to 9 can be applied to various electronic apparatuses. For example, the present invention is applicable to an air conditioner, a refrigerator, a water purifier, a cleaner, a vehicle, a robot, a drone, and the like of the home appliances as well as the laundry processing apparatuses described above. Various examples of home appliances applicable to the motor driving apparatus 220 will be described below.

10A to 10B are diagrams illustrating current waveforms when the motor is driven.

10A illustrates the duty waveform dta and the current waveform ioa flowing in the motor.

When a constant duty is applied in the Ta section that is the motor start section, an overshoot (iov) occurs in the current waveform (ioa) as shown in the figure.

This overshoot makes the circuit elements in the motor driving apparatus unstable.

In order to solve this problem, in the present invention, when a plurality of motors are started, the currents flowing in the motors sequentially increase.

In other words, the inverter control unit 430 controls the currents flowing in the motors to increase sequentially when a plurality of motors are started.

FIG. 10B illustrates the duty waveform dtb according to the embodiment of the present invention and the current waveform iob flowing in the motor.

In the case where the duty is sequentially increased in the section Tb which is the motor start section, overshoot does not occur in the current waveform iob as shown in the drawing. Therefore, it is possible to stably perform the motor drive, for example, the likelihood of burnout of the circuit element in the motor drive apparatus is lowered.

11 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.

The air conditioner 100b according to the present invention may include an indoor unit 31b and an outdoor unit 21b connected to the indoor unit 31b as shown in FIG.

The indoor unit 31b of the air conditioner may be any of a stand-type air conditioner, a wall-mounted type air conditioner, and a ceiling type air conditioner, but the stand type indoor unit 31b is exemplified in the figure.

Meanwhile, the air conditioner 100b may further include at least one of a ventilator, an air purifier, a humidifier, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.

The outdoor unit 21b includes a compressor (not shown) for receiving and compressing refrigerant, an outdoor heat exchanger (not shown) for exchanging heat between the refrigerant and outdoor air, an accumulator for extracting the gas refrigerant from the supplied refrigerant and supplying it to the compressor And a four-way valve (not shown) for selecting the flow path of the refrigerant according to the heating operation. In addition, a number of sensors, valves, oil recovery devices, and the like are further included, but a description thereof will be omitted below.

The outdoor unit 21b operates the compressor and the outdoor heat exchanger to compress or heat-exchange the refrigerant according to the setting to supply the refrigerant to the indoor unit 31b. The outdoor unit 21b can be driven by a demand of a remote controller (not shown) or the indoor unit 31b. At this time, as the cooling / heating capacity is changed corresponding to the indoor unit to be driven, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit can be varied.

At this time, the outdoor unit 21b supplies compressed refrigerant to the connected indoor unit 310b.

The indoor unit 31b receives the refrigerant from the outdoor unit 21b and discharges the cold air to the room. The indoor unit 31b includes an indoor heat exchanger (not shown), an indoor fan (not shown), an expansion valve (not shown) to which refrigerant is supplied, and a plurality of sensors (not shown).

At this time, the outdoor unit 21b and the indoor unit 31b are connected to each other via a communication line to exchange data. The outdoor unit and the indoor unit are connected to a remote controller (not shown) by wire or wireless, can do.

The remote controller (not shown) is connected to the indoor unit 31b, and inputs a control command of the user to the indoor unit, and receives and displays the status information of the indoor unit. At this time, the remote controller can communicate by wire or wireless according to the connection form with the indoor unit.

The motor driving apparatuses 220a to 220e shown in Figs. 4 to 9 can be applied to an outdoor unit, a compressor motor, a fan motor, and the like among the air conditioners. That is, the first motor may be a compressor motor, and the second motor may be a fan motor.

Alternatively, it can be applied to a fan motor, a vane motor, or the like in an indoor unit of an air conditioner. That is, the first motor may be a fan motor and the second motor may be a vane motor.

12 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.

The refrigerator 100c according to the present invention includes a case 110c having an inner space defined by a freezing compartment and a refrigerating compartment (not shown), a freezing compartment door 120c for shielding the freezing compartment, A refrigerating compartment door 140c is formed on the outer surface of the refrigerating compartment.

A door handle 121c protruded frontward is further provided on a front surface of the freezing compartment door 120c and the refrigerating compartment door 140c so that the user can easily grip the freezing compartment door 120c and the refrigerator compartment door 140c .

Meanwhile, a home bar 180c may be provided on the front of the refrigerator compartment door 140c, which is a means for allowing a user to take out a stored beverage such as a beverage stored in the refrigerator compartment door 140c without opening the refrigerator compartment door 140c.

The dispenser 160c may be provided on the front surface of the freezing chamber door 120c as a convenience means for allowing the user to easily remove ice or drinking water without opening the freezing chamber door 120c. A control panel 210c for controlling the driving operation of the refrigerator 100c and showing the state of the refrigerator 100c in operation can be further provided on the upper side.

In the drawing, the dispenser 160c is disposed on the front surface of the freezing chamber door 120c. However, the dispenser 160c may be disposed on the front surface of the refrigerator chamber door 140c.

On the other hand, an ice-maker 190c for ice-cooling the water supplied from the ice maker using the cool air in the freezing room is provided in the upper portion of the freezing chamber (not shown), and an ice bank (Not shown). Further, although not shown in the drawings, an ice chute (not shown) may be further provided to guide the ice contained in the ice bank 195c to be dropped by the dispenser 160c.

The control panel 210c may include an input unit 220c including a plurality of buttons, and a display unit 230c for displaying a control screen and an operation state.

The display unit 230c displays information such as a control screen, an operating state, and a room temperature. For example, the display unit 230c can display the service type (ice, water, sculptured ice) of the dispenser, the set temperature of the freezer, and the set temperature of the freezer.

The display unit 230c may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), or the like. Also, the display unit 230c may be implemented as a touch screen capable of performing the function of the input unit 220c.

The input unit 220c may include a plurality of operation buttons. For example, the input unit 220c includes a dispenser setting button (not shown) for setting the service type (each ice, water, sculpted ice, etc.) of the dispenser, a freezer room temperature setting button (not shown) And a refrigerator compartment temperature setting button (not shown) for setting the freezer compartment temperature. The input unit 220c may be implemented as a touch screen capable of performing a function of the display unit 230c.

Meanwhile, the refrigerator according to the embodiment of the present invention is not limited to the double door type shown in the drawing, but may be a one door type, a sliding door type, a curtain door type (Curtain Door Type).

On the other hand, the motor driving apparatuses 220a to 220e shown in Figs. 4 to 9 can be applied to a compressor motor, a fan motor, and the like in the refrigerator 100c. That is, the first motor may be a compressor motor, and the second motor may be a fan motor.

13 is a perspective view illustrating a dryer, which is another example of a home appliance according to an embodiment of the present invention.

Referring to the drawings, the dishwasher 100d may include a washing water receiving portion (not shown) in which wash water for dishwashing is collected.

In addition, the dishwasher 100d may include a tub 20a for providing a space in which the dishes are washed, and a sump 20b for collecting washing water for supplying the tub 20a.

The washing water in the sump 20b is sprayed into the tub 20a through the nozzles 8a, 8b and 8c during the operation of the washing pump (not shown), and the sprayed washing water fills the tub 20a, 20b. ≪ / RTI >

The casing (4) may include a cabinet (2) formed with a tablet inlet and a door (3) opening and closing the tablet inlet.

The door 3 may be provided with a handle 3a, a control panel 5 for controlling the operation of the dishwasher, and a display 225 for indicating the operating state of the dishwasher. The control panel 5 may be provided with an input unit 220.

The tub 20a may be provided with racks 7a and 7b on which dishes are placed and nozzles for receiving washing water from the sump 20b and spraying the dishes on the racks 7a and 7b.

A plurality of racks 7a and 7b may be provided and the upper rack 7a and the lower rack 7b are disposed below the upper rack 7a.

Further, a plurality of nozzles 8a, 8b, 8c may be provided so that the washing water can be sprayed in various directions.

The nozzles 8a, 8b and 8c are provided with an upper nozzle 8a for spraying wash water downward toward the upper rack 7a and a lower nozzle 7b arranged between the upper rack 7a and the lower rack 7b, An intermediate nozzle 8b for spraying wash water downward toward the lower rack 7b and a lower nozzle 8c disposed below the lower rack 7b for spraying wash water upward.

Although not shown in the drawings, guide ducts for guiding the washing water from the sump 20b to the respective nozzles may be formed corresponding to the configuration of the nozzles, and a flow-switching unit (not shown) for selectively interrupting the guide ducts May be further provided.

A washing pump (not shown) for feeding wash water contained in the sump 20b by the guide passage and a heater (not shown) for heating washing water in the sump 20b may be further provided.

The dishwasher 100d may include a water supply device 30 for supplying wash water to the sump 20b. The water supply device (30) can be disposed between the tub (20a) and the cabinet (2).

The water supply device 30 is provided with a flow path for guiding the flow of the washing water flowing into the inside thereof and water chambers for containing the washing water guided along the flow path and includes a water supply lake into which raw water (for example, tap water) A flow meter 33 for sensing the amount of raw water coming into the water supply hose connection port 32a, a water chamber 31 for storing the introduced wash water, (Not shown) for communicating the flow path with the atmosphere to prevent the siphon phenomenon in which the raw water flows.

The water supply device 30 includes a sump drainage connection port 32c connected to a sump drainage channel (not shown) through which the washing water used for washing dishes is discharged from the sump 20b, And a drain pump inflow connection port 32d connected to a drain pump inflow conduit (not shown).

The cleaning pump (not shown) includes a cleaning water guide (not shown) for guiding the cleaning water in the sump 20b to the nozzles 8a, 8b, 8c and an impeller (not shown) provided rotatably in the cleaning water guide And a cleaning motor (not shown) for rotating the impeller (not shown).

The water supply valve (not shown) interrupts washing water supplied to the sump 20b. When the water is supplied from the water supply device 30 to the sump 20b, the water is discharged from the water supply device 30 And may be provided to intermittently supply water from the external water source when water is supplied directly from the external water source to the sump 20b.

On the other hand, the operation of the water supply valve (not shown), the cleaning motor (not shown), and the like is performed by the control of the control unit (310 of FIG. 4).

The sump 20b and the tub 20a are in communication with each other and the sump 2 is sprayed through the nozzles 8a, 8b and 8c so that the reduced amount of the washing water can be introduced from the tub 20a.

The sump 20b may further include a filter (not shown). In this case, the washing water injected into the tub 20a through the nozzles 8a, 8b, and 8c passes through a filter (not shown) And then may flow back into the sump 20b.

Further, the dishwasher 100d may include an additive introducing mechanism for introducing detergent or rinse into the washing water, and the additive introducing mechanism may include a washing detergent or a rinse rinse at a predetermined stage of the washing or rinsing step, ). ≪ / RTI >

Meanwhile, the motor driving devices 220a to 220e shown in Figs. 4 to 9 can be applied to a washing motor, a drain motor, a water supply motor, and the like of the dishwasher 100d. That is, the first motor may be a cleaning motor, and the second motor may be a drain motor or a water supply motor.

The motor driving apparatus and the home appliance having the motor driving apparatus according to the embodiments of the present invention can be applied to the configuration and method of the embodiments described above in a limited manner, All or some of the embodiments may be selectively combined.

Meanwhile, the motor driving method or the method of operating the home appliance of the present invention can be implemented as a processor-readable code on a recording medium readable by a processor included in a motor driving apparatus or a home appliance. 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 detail may be made therein without departing from the spirit and scope of the present invention.

Claims (16)

at least one capacitor connected to the dc stage;
An inverter for converting a DC power source of the dc stage to an AC power source and outputting the converted AC power source to a plurality of motors by a switching operation, the inverter including a plurality of sagittal switching elements and a lower arm switching element; And
And an inverter control unit for controlling the inverter. The method according to claim 1,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
Driving the first motor of the plurality of motors by using the three-phase upper-arm switching element and the lower-arm switching element,
And the second motor of the plurality of motors is driven using the three-phase upper-arm switching element and the lower-arm switching element, using the upper-arm switching element and the lower-arm switching element. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
Wherein the first motor of the plurality of motors comprises:
Connected to each node between the three-phase upper arm switching element and the lower arm switching element,
And a second motor of the plurality of motors,
A dc terminal node between the first dc-terminal capacitor and the second dc-terminal capacitor, and a first node between the upper-arm switching element and the lower-arm switching element of the three-phase upper-arm switching element and the lower- And the motor driving device. The method according to claim 1,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
The first motor of the plurality of motors is driven by using the three-phase upper-arm switching element and the lower-arm switching element and using the upper-arm switching element and the lower-arm switching element,
And the second motor of the plurality of motors is driven by using the three-phase upper-arm switching element and the lower-arm switching element, using the upper-arm switching element and the lower-arm switching element. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
Wherein the first motor of the plurality of motors comprises:
A second node and a third node between the upper arm switching element and the lower arm switching element of the two phases of the three-phase upper arm switching element and the lower arm switching element in the inverter,
And a second motor of the plurality of motors,
A dc terminal node between the first dc-terminal capacitor and the second dc-terminal capacitor, and a first node between the upper-arm switching element and the lower-arm switching element of the three-phase upper-arm switching element and the lower- And the motor driving device. The method according to claim 1,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
A first motor of the plurality of motors is driven by using a three-phase sag lock switching device and a low-arm switching device,
A second motor of the plurality of motors is driven by using an upper arm switching element and a lower arm switching element of another phase of the three-phase upper arm switching element and the lower arm switching element,
And the third motor of the plurality of motors is driven by using the three-phase upper-arm switching element and the lower-arm switching element, and the upper-stage switching element and the lower-arm switching element. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter includes:
Phase three-phase switching element and a down-arm switching element,
Wherein the first motor of the plurality of motors comprises:
A dc terminal node between the first dc-terminal capacitor and the second dc-terminal capacitor, and a first node between the upper-arm switching element and the lower-arm switching element of the three-phase upper-arm switching element and the lower- And,
And a second motor of the plurality of motors,
A dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor; and a dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor, and a second node between the upper arm switch element and the lower arm switch element of the three- Respectively,
Wherein the third motor of the plurality of motors comprises:
A dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor; and a dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor, and a third node between the upper arm switch element and the lower arm switch element of the three- And the motor is connected to the motor. The method according to claim 1,
The inverter includes:
6 phases of upper and lower arm switching elements and a lower arm switching element,
A first motor of the plurality of motors is driven by using an upper arm switching element and a lower arm switching element of two phases among the six phase upper arm switching element and the lower arm switching element,
The second motor of the plurality of motors is driven by using the upper arm switching element and the lower arm switching element of the other two phases among the six-phase upper arm switching element and the lower arm switching element,
And the third motor among the plurality of motors is driven by using the upper arm switching element and the lower arm switching element of the remaining two phases of the six-phase upper arm switching element and the lower arm switching element. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter includes:
6 phases of upper and lower arm switching elements and a lower arm switching element,
Wherein the first motor of the plurality of motors comprises:
A first node and a second node between the upper arm switching element and the lower arm switching element of the two phases, of the six-phase upper arm switching element and the lower arm switching element in the inverter,
And a second motor of the plurality of motors,
And a second node connected between a third node and a fourth node between the upper arm switching element and the lower arm switching element of the other two phases of the upper arm switching element and the lower arm switching element in the inverter,
Wherein the third motor of the plurality of motors comprises:
And the sixth and sixth nodes between the upper arm switching element and the lower arm switching element among the six phase upper arm and lower arm switching elements in the inverter are connected to the fifth node and the sixth node between the upper arm switching element and the lower arm switching element. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter includes:
6 phases of upper and lower arm switching elements and a lower arm switching element,
Wherein the first motor of the plurality of motors includes a dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor and a dc terminal node between the dc terminal switching element and the down- Connected to the first node and the second node between the lower arm switching elements,
And a second motor of the plurality of motors,
A dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor; and a third node between the upper arm switching element and the lower arm switching element of the other two phases of the upper arm cancer switching element and the lower arm switching element in the inverter, Connected to the fourth node,
Wherein the third motor of the plurality of motors comprises:
A dc terminal node between the first dc terminal capacitor and the second dc terminal capacitor and a fifth node between the upper arm switching element and the lower arm switching element among the upper and lower arm switching elements of the six phases in the inverter, And the sixth node is connected to the sixth node. The method according to claim 1,
The inverter control unit includes:
The first motor of the plurality of motors is started and operated first, and the second motor is started and operated after the start of the motor. The method according to claim 1,
The inverter control unit includes:
Wherein the first motor of the plurality of motors is controlled to be continuously operated and the second motor is controlled to operate intermittently. The method according to claim 1,
The inverter control unit includes:
And controls so that the current flowing to the motor sequentially increases when the plurality of motors are started. The method according to claim 1,
A first dc-stage capacitor and a second dc-stage capacitor are disposed in the dc stage,
The inverter control unit includes:
And controls the voltage of the first dc-terminal capacitor and the voltage of the second dc-terminal capacitor to be kept in equilibrium. The method according to claim 1,
a first output current detection unit connected to the dc stage and detecting an output current; And
A second and a third output current detecting unit connected to one ends of the lower arm switching elements of the two phases of the plurality of sagittal switching elements and the lower arm switching elements in the inverter to detect an output current; The motor driving apparatus further comprising: 16. A home appliance comprising the motor drive device according to any one of claims 1 to 15.

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